Merge tag 'for-upstream' of https://gitlab.com/bonzini/qemu into staging

* scripts: dump stdin on meson-buildoptions error
* rust: introduce qemu_api::cell::Opaque<>
* rust: express pinning requirements for timers
* rust: hpet: decode HPET registers into enums
* rust: cell: add full example of declaring a SysBusDevice
* rust: qom: remove operations on &mut

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# gpg: Signature made Sun 09 Mar 2025 18:29:16 HKT
# gpg:                using RSA key F13338574B662389866C7682BFFBD25F78C7AE83
# gpg:                issuer "pbonzini@redhat.com"
# gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>" [full]
# gpg:                 aka "Paolo Bonzini <pbonzini@redhat.com>" [full]
# Primary key fingerprint: 46F5 9FBD 57D6 12E7 BFD4  E2F7 7E15 100C CD36 69B1
#      Subkey fingerprint: F133 3857 4B66 2389 866C  7682 BFFB D25F 78C7 AE83

* tag 'for-upstream' of https://gitlab.com/bonzini/qemu: (25 commits)
  rust: pl011: Allow NULL chardev argument to pl011_create()
  meson.build: default to -gsplit-dwarf for debug info
  rust: qom: remove operations on &mut
  rust: cell: add full example of declaring a SysBusDevice
  rust: hpet: decode HPET registers into enums
  rust: pl011: pass around registers::Data
  rust: pl011: switch to safe chardev operation
  rust: pl011: clean up visibilities of callbacks
  rust: pl011: move register definitions out of lib.rs
  rust: chardev: provide basic bindings to character devices
  rust: bindings: remove more unnecessary Send/Sync impls
  rust: chardev: wrap Chardev with Opaque<>
  rust: memory: wrap MemoryRegion with Opaque<>
  rust: sysbus: wrap SysBusDevice with Opaque<>
  rust: hpet: do not access fields of SysBusDevice
  rust: qdev: wrap Clock and DeviceState with Opaque<>
  rust: qom: wrap Object with Opaque<>
  rust: irq: wrap IRQState with Opaque<>
  rust: timer: wrap QEMUTimer with Opaque<> and express pinning requirements
  rust: hpet: embed Timer without the Option and Box indirection
  ...

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

25 files changed, 1545 insertions, 1004 deletions

diff --git a/docs/devel/rust.rst b/docs/devel/rust.rst
index 5d8aa3a..88bdec1 100644
--- a/docs/devel/rust.rst
+++ b/docs/devel/rust.rst
@@ -296,15 +296,35 @@ of ``&mut self``; access to internal fields must use *interior mutability*
 to go from a shared reference to a ``&mut``.
 
 Whenever C code provides you with an opaque ``void *``, avoid converting it
-to a Rust mutable reference, and use a shared reference instead.  Rust code
-will then have to use QEMU's ``BqlRefCell`` and ``BqlCell`` type, which
-enforce that locking rules for the "Big QEMU Lock" are respected.  These cell
-types are also known to the ``vmstate`` crate, which is able to "look inside"
-them when building an in-memory representation of a ``struct``'s layout.
-Note that the same is not true of a ``RefCell`` or ``Mutex``.
-
-In the future, similar cell types might also be provided for ``AioContext``-based
-locking as well.
+to a Rust mutable reference, and use a shared reference instead.  The
+``qemu_api::cell`` module provides wrappers that can be used to tell the
+Rust compiler about interior mutability, and optionally to enforce locking
+rules for the "Big QEMU Lock".  In the future, similar cell types might
+also be provided for ``AioContext``-based locking as well.
+
+In particular, device code will usually rely on the ``BqlRefCell`` and
+``BqlCell`` type to ensure that data is accessed correctly under the
+"Big QEMU Lock".  These cell types are also known to the ``vmstate``
+crate, which is able to "look inside" them when building an in-memory
+representation of a ``struct``'s layout.  Note that the same is not true
+of a ``RefCell`` or ``Mutex``.
+
+Bindings code instead will usually use the ``Opaque`` type, which hides
+the contents of the underlying struct and can be easily converted to
+a raw pointer, for use in calls to C functions.  It can be used for
+example as follows::
+
+    #[repr(transparent)]
+    #[derive(Debug, qemu_api_macros::Wrapper)]
+    pub struct Object(Opaque<bindings::Object>);
+
+where the special ``derive`` macro provides useful methods such as
+``from_raw``, ``as_ptr`, ``as_mut_ptr`` and ``raw_get``.  The bindings will
+then manually check for the big QEMU lock with assertions, which allows
+the wrapper to be declared thread-safe::
+
+    unsafe impl Send for Object {}
+    unsafe impl Sync for Object {}
 
 Writing bindings to C code
 ''''''''''''''''''''''''''
diff --git a/meson.build b/meson.build
index 8b9fda4..4899d89 100644
--- a/meson.build
+++ b/meson.build
@@ -601,6 +601,10 @@ if get_option('tsan')
   qemu_ldflags = ['-fsanitize=thread'] + qemu_ldflags
 endif
 
+if get_option('debug') and get_option('split_debug')
+  qemu_cflags += '-gsplit-dwarf'
+endif
+
 # Detect support for PT_GNU_RELRO + DT_BIND_NOW.
 # The combination is known as "full relro", because .got.plt is read-only too.
 qemu_ldflags += cc.get_supported_link_arguments('-Wl,-z,relro', '-Wl,-z,now')
@@ -4015,7 +4019,7 @@ libchardev = static_library('chardev', chardev_ss.sources() + genh,
                             build_by_default: false)
 
 chardev = declare_dependency(objects: libchardev.extract_all_objects(recursive: false),
-                             dependencies: chardev_ss.dependencies())
+                             dependencies: [chardev_ss.dependencies(), io])
 
 hwcore_ss = hwcore_ss.apply({})
 libhwcore = static_library('hwcore', sources: hwcore_ss.sources() + genh,
@@ -4100,13 +4104,6 @@ if have_rust
   foreach enum : c_bitfields
     bindgen_args += ['--bitfield-enum', enum]
   endforeach
-  c_nocopy = [
-    'QEMUTimer',
-  ]
-  # Used to customize Drop trait
-  foreach struct : c_nocopy
-    bindgen_args += ['--no-copy', struct]
-  endforeach
 
   # TODO: Remove this comment when the clang/libclang mismatch issue is solved.
   #
@@ -4590,6 +4587,8 @@ if have_rust
   summary_info += {'bindgen':         bindgen.full_path()}
   summary_info += {'bindgen version': bindgen.version()}
 endif
+# option_cflags is purely for the summary display, meson will pass
+# -g/-O options directly
 option_cflags = (get_option('debug') ? ['-g'] : [])
 if get_option('optimization') != 'plain'
   option_cflags += ['-O' + get_option('optimization')]
diff --git a/meson_options.txt b/meson_options.txt
index 59d973b..3432123 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -362,6 +362,8 @@ option('debug_mutex', type: 'boolean', value: false,
        description: 'mutex debugging support')
 option('debug_stack_usage', type: 'boolean', value: false,
        description: 'measure coroutine stack usage')
+option('split_debug', type: 'boolean', value: true,
+       description: 'split debug info from object files')
 option('qom_cast_debug', type: 'boolean', value: true,
        description: 'cast debugging support')
 option('slirp_smbd', type : 'feature', value : 'auto',
diff --git a/rust/Cargo.toml b/rust/Cargo.toml
index 5041d62..ab1185a 100644
--- a/rust/Cargo.toml
+++ b/rust/Cargo.toml
@@ -37,6 +37,8 @@ result_unit_err = "allow"
 should_implement_trait = "deny"
 # can be for a reason, e.g. in callbacks
 unused_self = "allow"
+# common in device crates
+upper_case_acronyms = "allow"
 
 # default-allow lints
 as_ptr_cast_mut = "deny"
diff --git a/rust/hw/char/pl011/src/device.rs b/rust/hw/char/pl011/src/device.rs
index d0857b4..f137b49 100644
--- a/rust/hw/char/pl011/src/device.rs
+++ b/rust/hw/char/pl011/src/device.rs
@@ -2,18 +2,10 @@
 // Author(s): Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
 // SPDX-License-Identifier: GPL-2.0-or-later
 
-use std::{
-    ffi::CStr,
-    os::raw::{c_int, c_void},
-    ptr::{addr_of, addr_of_mut, NonNull},
-};
+use std::{ffi::CStr, ptr::addr_of_mut};
 
 use qemu_api::{
-    bindings::{
-        qemu_chr_fe_accept_input, qemu_chr_fe_ioctl, qemu_chr_fe_set_handlers,
-        qemu_chr_fe_write_all, CharBackend, QEMUChrEvent, CHR_IOCTL_SERIAL_SET_BREAK,
-    },
-    chardev::Chardev,
+    chardev::{CharBackend, Chardev, Event},
     impl_vmstate_forward,
     irq::{IRQState, InterruptSource},
     memory::{hwaddr, MemoryRegion, MemoryRegionOps, MemoryRegionOpsBuilder},
@@ -26,10 +18,13 @@ use qemu_api::{
 
 use crate::{
     device_class,
-    registers::{self, Interrupt},
-    RegisterOffset,
+    registers::{self, Interrupt, RegisterOffset},
 };
 
+// TODO: You must disable the UART before any of the control registers are
+// reprogrammed. When the UART is disabled in the middle of transmission or
+// reception, it completes the current character before stopping
+
 /// Integer Baud Rate Divider, `UARTIBRD`
 const IBRD_MASK: u32 = 0xffff;
 
@@ -232,14 +227,14 @@ impl PL011Registers {
         &mut self,
         offset: RegisterOffset,
         value: u32,
-        char_backend: *mut CharBackend,
+        char_backend: &CharBackend,
     ) -> bool {
         // eprintln!("write offset {offset} value {value}");
         use RegisterOffset::*;
         match offset {
             DR => {
                 // interrupts always checked
-                let _ = self.loopback_tx(value);
+                let _ = self.loopback_tx(value.into());
                 self.int_level |= Interrupt::TX.0;
                 return true;
             }
@@ -266,17 +261,9 @@ impl PL011Registers {
                     self.reset_tx_fifo();
                 }
                 let update = (self.line_control.send_break() != new_val.send_break()) && {
-                    let mut break_enable: c_int = new_val.send_break().into();
-                    // SAFETY: self.char_backend is a valid CharBackend instance after it's been
-                    // initialized in realize().
-                    unsafe {
-                        qemu_chr_fe_ioctl(
-                            char_backend,
-                            CHR_IOCTL_SERIAL_SET_BREAK as i32,
-                            addr_of_mut!(break_enable).cast::<c_void>(),
-                        );
-                    }
-                    self.loopback_break(break_enable > 0)
+                    let break_enable = new_val.send_break();
+                    let _ = char_backend.send_break(break_enable);
+                    self.loopback_break(break_enable)
                 };
                 self.line_control = new_val;
                 self.set_read_trigger();
@@ -314,7 +301,7 @@ impl PL011Registers {
 
     #[inline]
     #[must_use]
-    fn loopback_tx(&mut self, value: u32) -> bool {
+    fn loopback_tx(&mut self, value: registers::Data) -> bool {
         // Caveat:
         //
         // In real hardware, TX loopback happens at the serial-bit level
@@ -383,7 +370,7 @@ impl PL011Registers {
     }
 
     fn loopback_break(&mut self, enable: bool) -> bool {
-        enable && self.loopback_tx(registers::Data::BREAK.into())
+        enable && self.loopback_tx(registers::Data::BREAK)
     }
 
     fn set_read_trigger(&mut self) {
@@ -442,11 +429,11 @@ impl PL011Registers {
     }
 
     #[must_use]
-    pub fn put_fifo(&mut self, value: u32) -> bool {
+    pub fn put_fifo(&mut self, value: registers::Data) -> bool {
         let depth = self.fifo_depth();
         assert!(depth > 0);
         let slot = (self.read_pos + self.read_count) & (depth - 1);
-        self.read_fifo[slot] = registers::Data::from(value);
+        self.read_fifo[slot] = value;
         self.read_count += 1;
         self.flags.set_receive_fifo_empty(false);
         if self.read_count == depth {
@@ -534,7 +521,7 @@ impl PL011State {
         }
     }
 
-    pub fn read(&self, offset: hwaddr, _size: u32) -> u64 {
+    fn read(&self, offset: hwaddr, _size: u32) -> u64 {
         match RegisterOffset::try_from(offset) {
             Err(v) if (0x3f8..0x400).contains(&(v >> 2)) => {
                 let device_id = self.get_class().device_id;
@@ -548,37 +535,30 @@ impl PL011State {
                 let (update_irq, result) = self.regs.borrow_mut().read(field);
                 if update_irq {
                     self.update();
-                    unsafe {
-                        qemu_chr_fe_accept_input(addr_of!(self.char_backend) as *mut _);
-                    }
+                    self.char_backend.accept_input();
                 }
                 result.into()
             }
         }
     }
 
-    pub fn write(&self, offset: hwaddr, value: u64, _size: u32) {
+    fn write(&self, offset: hwaddr, value: u64, _size: u32) {
         let mut update_irq = false;
         if let Ok(field) = RegisterOffset::try_from(offset) {
             // qemu_chr_fe_write_all() calls into the can_receive
             // callback, so handle writes before entering PL011Registers.
             if field == RegisterOffset::DR {
                 // ??? Check if transmitter is enabled.
-                let ch: u8 = value as u8;
-                // SAFETY: char_backend is a valid CharBackend instance after it's been
-                // initialized in realize().
+                let ch: [u8; 1] = [value as u8];
                 // XXX this blocks entire thread. Rewrite to use
                 // qemu_chr_fe_write and background I/O callbacks
-                unsafe {
-                    qemu_chr_fe_write_all(addr_of!(self.char_backend) as *mut _, &ch, 1);
-                }
+                let _ = self.char_backend.write_all(&ch);
             }
 
-            update_irq = self.regs.borrow_mut().write(
-                field,
-                value as u32,
-                addr_of!(self.char_backend) as *mut _,
-            );
+            update_irq = self
+                .regs
+                .borrow_mut()
+                .write(field, value as u32, &self.char_backend);
         } else {
             eprintln!("write bad offset {offset} value {value}");
         }
@@ -587,15 +567,19 @@ impl PL011State {
         }
     }
 
-    pub fn can_receive(&self) -> bool {
-        // trace_pl011_can_receive(s->lcr, s->read_count, r);
+    fn can_receive(&self) -> u32 {
         let regs = self.regs.borrow();
-        regs.read_count < regs.fifo_depth()
+        // trace_pl011_can_receive(s->lcr, s->read_count, r);
+        u32::from(regs.read_count < regs.fifo_depth())
     }
 
-    pub fn receive(&self, ch: u32) {
+    fn receive(&self, buf: &[u8]) {
+        if buf.is_empty() {
+            return;
+        }
         let mut regs = self.regs.borrow_mut();
-        let update_irq = !regs.loopback_enabled() && regs.put_fifo(ch);
+        let c: u32 = buf[0].into();
+        let update_irq = !regs.loopback_enabled() && regs.put_fifo(c.into());
         // Release the BqlRefCell before calling self.update()
         drop(regs);
 
@@ -604,11 +588,11 @@ impl PL011State {
         }
     }
 
-    pub fn event(&self, event: QEMUChrEvent) {
+    fn event(&self, event: Event) {
         let mut update_irq = false;
         let mut regs = self.regs.borrow_mut();
-        if event == QEMUChrEvent::CHR_EVENT_BREAK && !regs.loopback_enabled() {
-            update_irq = regs.put_fifo(registers::Data::BREAK.into());
+        if event == Event::CHR_EVENT_BREAK && !regs.loopback_enabled() {
+            update_irq = regs.put_fifo(registers::Data::BREAK);
         }
         // Release the BqlRefCell before calling self.update()
         drop(regs);
@@ -618,28 +602,16 @@ impl PL011State {
         }
     }
 
-    pub fn realize(&self) {
-        // SAFETY: self.char_backend has the correct size and alignment for a
-        // CharBackend object, and its callbacks are of the correct types.
-        unsafe {
-            qemu_chr_fe_set_handlers(
-                addr_of!(self.char_backend) as *mut CharBackend,
-                Some(pl011_can_receive),
-                Some(pl011_receive),
-                Some(pl011_event),
-                None,
-                addr_of!(*self).cast::<c_void>() as *mut c_void,
-                core::ptr::null_mut(),
-                true,
-            );
-        }
+    fn realize(&self) {
+        self.char_backend
+            .enable_handlers(self, Self::can_receive, Self::receive, Self::event);
     }
 
-    pub fn reset_hold(&self, _type: ResetType) {
+    fn reset_hold(&self, _type: ResetType) {
         self.regs.borrow_mut().reset();
     }
 
-    pub fn update(&self) {
+    fn update(&self) {
         let regs = self.regs.borrow();
         let flags = regs.int_level & regs.int_enabled;
         for (irq, i) in self.interrupts.iter().zip(IRQMASK) {
@@ -665,43 +637,6 @@ const IRQMASK: [u32; 6] = [
 
 /// # Safety
 ///
-/// We expect the FFI user of this function to pass a valid pointer, that has
-/// the same size as [`PL011State`]. We also expect the device is
-/// readable/writeable from one thread at any time.
-pub unsafe extern "C" fn pl011_can_receive(opaque: *mut c_void) -> c_int {
-    let state = NonNull::new(opaque).unwrap().cast::<PL011State>();
-    unsafe { state.as_ref().can_receive().into() }
-}
-
-/// # Safety
-///
-/// We expect the FFI user of this function to pass a valid pointer, that has
-/// the same size as [`PL011State`]. We also expect the device is
-/// readable/writeable from one thread at any time.
-///
-/// The buffer and size arguments must also be valid.
-pub unsafe extern "C" fn pl011_receive(opaque: *mut c_void, buf: *const u8, size: c_int) {
-    let state = NonNull::new(opaque).unwrap().cast::<PL011State>();
-    unsafe {
-        if size > 0 {
-            debug_assert!(!buf.is_null());
-            state.as_ref().receive(u32::from(buf.read_volatile()));
-        }
-    }
-}
-
-/// # Safety
-///
-/// We expect the FFI user of this function to pass a valid pointer, that has
-/// the same size as [`PL011State`]. We also expect the device is
-/// readable/writeable from one thread at any time.
-pub unsafe extern "C" fn pl011_event(opaque: *mut c_void, event: QEMUChrEvent) {
-    let state = NonNull::new(opaque).unwrap().cast::<PL011State>();
-    unsafe { state.as_ref().event(event) }
-}
-
-/// # Safety
-///
 /// We expect the FFI user of this function to pass a valid pointer for `chr`
 /// and `irq`.
 #[no_mangle]
@@ -713,10 +648,12 @@ pub unsafe extern "C" fn pl011_create(
     // SAFETY: The callers promise that they have owned references.
     // They do not gift them to pl011_create, so use `Owned::from`.
     let irq = unsafe { Owned::<IRQState>::from(&*irq) };
-    let chr = unsafe { Owned::<Chardev>::from(&*chr) };
 
     let dev = PL011State::new();
-    dev.prop_set_chr("chardev", &chr);
+    if !chr.is_null() {
+        let chr = unsafe { Owned::<Chardev>::from(&*chr) };
+        dev.prop_set_chr("chardev", &chr);
+    }
     dev.sysbus_realize();
     dev.mmio_map(0, addr);
     dev.connect_irq(0, &irq);
diff --git a/rust/hw/char/pl011/src/lib.rs b/rust/hw/char/pl011/src/lib.rs
index 1bf46c6..dbae769 100644
--- a/rust/hw/char/pl011/src/lib.rs
+++ b/rust/hw/char/pl011/src/lib.rs
@@ -12,522 +12,13 @@
 //! See [`PL011State`](crate::device::PL011State) for the device model type and
 //! the [`registers`] module for register types.
 
-#![allow(clippy::upper_case_acronyms)]
-
 use qemu_api::c_str;
 
 mod device;
 mod device_class;
+mod registers;
 
 pub use device::pl011_create;
 
 pub const TYPE_PL011: &::std::ffi::CStr = c_str!("pl011");
 pub const TYPE_PL011_LUMINARY: &::std::ffi::CStr = c_str!("pl011_luminary");
-
-/// Offset of each register from the base memory address of the device.
-///
-/// # Source
-/// ARM DDI 0183G, Table 3-1 p.3-3
-#[doc(alias = "offset")]
-#[allow(non_camel_case_types)]
-#[repr(u64)]
-#[derive(Debug, Eq, PartialEq, qemu_api_macros::TryInto)]
-enum RegisterOffset {
-    /// Data Register
-    ///
-    /// A write to this register initiates the actual data transmission
-    #[doc(alias = "UARTDR")]
-    DR = 0x000,
-    /// Receive Status Register or Error Clear Register
-    #[doc(alias = "UARTRSR")]
-    #[doc(alias = "UARTECR")]
-    RSR = 0x004,
-    /// Flag Register
-    ///
-    /// A read of this register shows if transmission is complete
-    #[doc(alias = "UARTFR")]
-    FR = 0x018,
-    /// Fractional Baud Rate Register
-    ///
-    /// responsible for baud rate speed
-    #[doc(alias = "UARTFBRD")]
-    FBRD = 0x028,
-    /// `IrDA` Low-Power Counter Register
-    #[doc(alias = "UARTILPR")]
-    ILPR = 0x020,
-    /// Integer Baud Rate Register
-    ///
-    /// Responsible for baud rate speed
-    #[doc(alias = "UARTIBRD")]
-    IBRD = 0x024,
-    /// line control register (data frame format)
-    #[doc(alias = "UARTLCR_H")]
-    LCR_H = 0x02C,
-    /// Toggle UART, transmission or reception
-    #[doc(alias = "UARTCR")]
-    CR = 0x030,
-    /// Interrupt FIFO Level Select Register
-    #[doc(alias = "UARTIFLS")]
-    FLS = 0x034,
-    /// Interrupt Mask Set/Clear Register
-    #[doc(alias = "UARTIMSC")]
-    IMSC = 0x038,
-    /// Raw Interrupt Status Register
-    #[doc(alias = "UARTRIS")]
-    RIS = 0x03C,
-    /// Masked Interrupt Status Register
-    #[doc(alias = "UARTMIS")]
-    MIS = 0x040,
-    /// Interrupt Clear Register
-    #[doc(alias = "UARTICR")]
-    ICR = 0x044,
-    /// DMA control Register
-    #[doc(alias = "UARTDMACR")]
-    DMACR = 0x048,
-    ///// Reserved, offsets `0x04C` to `0x07C`.
-    //Reserved = 0x04C,
-}
-
-mod registers {
-    //! Device registers exposed as typed structs which are backed by arbitrary
-    //! integer bitmaps. [`Data`], [`Control`], [`LineControl`], etc.
-    use bilge::prelude::*;
-    use qemu_api::impl_vmstate_bitsized;
-
-    /// Receive Status Register / Data Register common error bits
-    ///
-    /// The `UARTRSR` register is updated only when a read occurs
-    /// from the `UARTDR` register with the same status information
-    /// that can also be obtained by reading the `UARTDR` register
-    #[bitsize(8)]
-    #[derive(Clone, Copy, Default, DebugBits, FromBits)]
-    pub struct Errors {
-        pub framing_error: bool,
-        pub parity_error: bool,
-        pub break_error: bool,
-        pub overrun_error: bool,
-        _reserved_unpredictable: u4,
-    }
-
-    // TODO: FIFO Mode has different semantics
-    /// Data Register, `UARTDR`
-    ///
-    /// The `UARTDR` register is the data register.
-    ///
-    /// For words to be transmitted:
-    ///
-    /// - if the FIFOs are enabled, data written to this location is pushed onto
-    ///   the transmit
-    /// FIFO
-    /// - if the FIFOs are not enabled, data is stored in the transmitter
-    ///   holding register (the
-    /// bottom word of the transmit FIFO).
-    ///
-    /// The write operation initiates transmission from the UART. The data is
-    /// prefixed with a start bit, appended with the appropriate parity bit
-    /// (if parity is enabled), and a stop bit. The resultant word is then
-    /// transmitted.
-    ///
-    /// For received words:
-    ///
-    /// - if the FIFOs are enabled, the data byte and the 4-bit status (break,
-    ///   frame, parity,
-    /// and overrun) is pushed onto the 12-bit wide receive FIFO
-    /// - if the FIFOs are not enabled, the data byte and status are stored in
-    ///   the receiving
-    /// holding register (the bottom word of the receive FIFO).
-    ///
-    /// The received data byte is read by performing reads from the `UARTDR`
-    /// register along with the corresponding status information. The status
-    /// information can also be read by a read of the `UARTRSR/UARTECR`
-    /// register.
-    ///
-    /// # Note
-    ///
-    /// You must disable the UART before any of the control registers are
-    /// reprogrammed. When the UART is disabled in the middle of
-    /// transmission or reception, it completes the current character before
-    /// stopping.
-    ///
-    /// # Source
-    /// ARM DDI 0183G 3.3.1 Data Register, UARTDR
-    #[bitsize(32)]
-    #[derive(Clone, Copy, Default, DebugBits, FromBits)]
-    #[doc(alias = "UARTDR")]
-    pub struct Data {
-        pub data: u8,
-        pub errors: Errors,
-        _reserved: u16,
-    }
-    impl_vmstate_bitsized!(Data);
-
-    impl Data {
-        // bilge is not very const-friendly, unfortunately
-        pub const BREAK: Self = Self { value: 1 << 10 };
-    }
-
-    // TODO: FIFO Mode has different semantics
-    /// Receive Status Register / Error Clear Register, `UARTRSR/UARTECR`
-    ///
-    /// The UARTRSR/UARTECR register is the receive status register/error clear
-    /// register. Receive status can also be read from the `UARTRSR`
-    /// register. If the status is read from this register, then the status
-    /// information for break, framing and parity corresponds to the
-    /// data character read from the [Data register](Data), `UARTDR` prior to
-    /// reading the UARTRSR register. The status information for overrun is
-    /// set immediately when an overrun condition occurs.
-    ///
-    ///
-    /// # Note
-    /// The received data character must be read first from the [Data
-    /// Register](Data), `UARTDR` before reading the error status associated
-    /// with that data character from the `UARTRSR` register. This read
-    /// sequence cannot be reversed, because the `UARTRSR` register is
-    /// updated only when a read occurs from the `UARTDR` register. However,
-    /// the status information can also be obtained by reading the `UARTDR`
-    /// register
-    ///
-    /// # Source
-    /// ARM DDI 0183G 3.3.2 Receive Status Register/Error Clear Register,
-    /// UARTRSR/UARTECR
-    #[bitsize(32)]
-    #[derive(Clone, Copy, DebugBits, FromBits)]
-    pub struct ReceiveStatusErrorClear {
-        pub errors: Errors,
-        _reserved_unpredictable: u24,
-    }
-    impl_vmstate_bitsized!(ReceiveStatusErrorClear);
-
-    impl ReceiveStatusErrorClear {
-        pub fn set_from_data(&mut self, data: Data) {
-            self.set_errors(data.errors());
-        }
-
-        pub fn reset(&mut self) {
-            // All the bits are cleared to 0 on reset.
-            *self = Self::default();
-        }
-    }
-
-    impl Default for ReceiveStatusErrorClear {
-        fn default() -> Self {
-            0.into()
-        }
-    }
-
-    #[bitsize(32)]
-    #[derive(Clone, Copy, DebugBits, FromBits)]
-    /// Flag Register, `UARTFR`
-    #[doc(alias = "UARTFR")]
-    pub struct Flags {
-        /// CTS Clear to send. This bit is the complement of the UART clear to
-        /// send, `nUARTCTS`, modem status input. That is, the bit is 1
-        /// when `nUARTCTS` is LOW.
-        pub clear_to_send: bool,
-        /// DSR Data set ready. This bit is the complement of the UART data set
-        /// ready, `nUARTDSR`, modem status input. That is, the bit is 1 when
-        /// `nUARTDSR` is LOW.
-        pub data_set_ready: bool,
-        /// DCD Data carrier detect. This bit is the complement of the UART data
-        /// carrier detect, `nUARTDCD`, modem status input. That is, the bit is
-        /// 1 when `nUARTDCD` is LOW.
-        pub data_carrier_detect: bool,
-        /// BUSY UART busy. If this bit is set to 1, the UART is busy
-        /// transmitting data. This bit remains set until the complete
-        /// byte, including all the stop bits, has been sent from the
-        /// shift register. This bit is set as soon as the transmit FIFO
-        /// becomes non-empty, regardless of whether the UART is enabled
-        /// or not.
-        pub busy: bool,
-        /// RXFE Receive FIFO empty. The meaning of this bit depends on the
-        /// state of the FEN bit in the UARTLCR_H register. If the FIFO
-        /// is disabled, this bit is set when the receive holding
-        /// register is empty. If the FIFO is enabled, the RXFE bit is
-        /// set when the receive FIFO is empty.
-        pub receive_fifo_empty: bool,
-        /// TXFF Transmit FIFO full. The meaning of this bit depends on the
-        /// state of the FEN bit in the UARTLCR_H register. If the FIFO
-        /// is disabled, this bit is set when the transmit holding
-        /// register is full. If the FIFO is enabled, the TXFF bit is
-        /// set when the transmit FIFO is full.
-        pub transmit_fifo_full: bool,
-        /// RXFF Receive FIFO full. The meaning of this bit depends on the state
-        /// of the FEN bit in the UARTLCR_H register. If the FIFO is
-        /// disabled, this bit is set when the receive holding register
-        /// is full. If the FIFO is enabled, the RXFF bit is set when
-        /// the receive FIFO is full.
-        pub receive_fifo_full: bool,
-        /// Transmit FIFO empty. The meaning of this bit depends on the state of
-        /// the FEN bit in the [Line Control register](LineControl),
-        /// `UARTLCR_H`. If the FIFO is disabled, this bit is set when the
-        /// transmit holding register is empty. If the FIFO is enabled,
-        /// the TXFE bit is set when the transmit FIFO is empty. This
-        /// bit does not indicate if there is data in the transmit shift
-        /// register.
-        pub transmit_fifo_empty: bool,
-        /// `RI`, is `true` when `nUARTRI` is `LOW`.
-        pub ring_indicator: bool,
-        _reserved_zero_no_modify: u23,
-    }
-    impl_vmstate_bitsized!(Flags);
-
-    impl Flags {
-        pub fn reset(&mut self) {
-            *self = Self::default();
-        }
-    }
-
-    impl Default for Flags {
-        fn default() -> Self {
-            let mut ret: Self = 0.into();
-            // After reset TXFF, RXFF, and BUSY are 0, and TXFE and RXFE are 1
-            ret.set_receive_fifo_empty(true);
-            ret.set_transmit_fifo_empty(true);
-            ret
-        }
-    }
-
-    #[bitsize(32)]
-    #[derive(Clone, Copy, DebugBits, FromBits)]
-    /// Line Control Register, `UARTLCR_H`
-    #[doc(alias = "UARTLCR_H")]
-    pub struct LineControl {
-        /// BRK Send break.
-        ///
-        /// If this bit is set to `1`, a low-level is continually output on the
-        /// `UARTTXD` output, after completing transmission of the
-        /// current character. For the proper execution of the break command,
-        /// the software must set this bit for at least two complete
-        /// frames. For normal use, this bit must be cleared to `0`.
-        pub send_break: bool,
-        /// 1 PEN Parity enable:
-        ///
-        /// - 0 = parity is disabled and no parity bit added to the data frame
-        /// - 1 = parity checking and generation is enabled.
-        ///
-        /// See Table 3-11 on page 3-14 for the parity truth table.
-        pub parity_enabled: bool,
-        /// EPS Even parity select. Controls the type of parity the UART uses
-        /// during transmission and reception:
-        /// - 0 = odd parity. The UART generates or checks for an odd number of
-        ///   1s in the data and parity bits.
-        /// - 1 = even parity. The UART generates or checks for an even number
-        ///   of 1s in the data and parity bits.
-        /// This bit has no effect when the `PEN` bit disables parity checking
-        /// and generation. See Table 3-11 on page 3-14 for the parity
-        /// truth table.
-        pub parity: Parity,
-        /// 3 STP2 Two stop bits select. If this bit is set to 1, two stop bits
-        /// are transmitted at the end of the frame. The receive
-        /// logic does not check for two stop bits being received.
-        pub two_stops_bits: bool,
-        /// FEN Enable FIFOs:
-        /// 0 = FIFOs are disabled (character mode) that is, the FIFOs become
-        /// 1-byte-deep holding registers 1 = transmit and receive FIFO
-        /// buffers are enabled (FIFO mode).
-        pub fifos_enabled: Mode,
-        /// WLEN Word length. These bits indicate the number of data bits
-        /// transmitted or received in a frame as follows: b11 = 8 bits
-        /// b10 = 7 bits
-        /// b01 = 6 bits
-        /// b00 = 5 bits.
-        pub word_length: WordLength,
-        /// 7 SPS Stick parity select.
-        /// 0 = stick parity is disabled
-        /// 1 = either:
-        /// • if the EPS bit is 0 then the parity bit is transmitted and checked
-        /// as a 1 • if the EPS bit is 1 then the parity bit is
-        /// transmitted and checked as a 0. This bit has no effect when
-        /// the PEN bit disables parity checking and generation. See Table 3-11
-        /// on page 3-14 for the parity truth table.
-        pub sticky_parity: bool,
-        /// 31:8 - Reserved, do not modify, read as zero.
-        _reserved_zero_no_modify: u24,
-    }
-    impl_vmstate_bitsized!(LineControl);
-
-    impl LineControl {
-        pub fn reset(&mut self) {
-            // All the bits are cleared to 0 when reset.
-            *self = 0.into();
-        }
-    }
-
-    impl Default for LineControl {
-        fn default() -> Self {
-            0.into()
-        }
-    }
-
-    #[bitsize(1)]
-    #[derive(Clone, Copy, Debug, Eq, FromBits, PartialEq)]
-    /// `EPS` "Even parity select", field of [Line Control
-    /// register](LineControl).
-    pub enum Parity {
-        /// - 0 = odd parity. The UART generates or checks for an odd number of
-        ///   1s in the data and parity bits.
-        Odd = 0,
-        /// - 1 = even parity. The UART generates or checks for an even number
-        ///   of 1s in the data and parity bits.
-        Even = 1,
-    }
-
-    #[bitsize(1)]
-    #[derive(Clone, Copy, Debug, Eq, FromBits, PartialEq)]
-    /// `FEN` "Enable FIFOs" or Device mode, field of [Line Control
-    /// register](LineControl).
-    pub enum Mode {
-        /// 0 = FIFOs are disabled (character mode) that is, the FIFOs become
-        /// 1-byte-deep holding registers
-        Character = 0,
-        /// 1 = transmit and receive FIFO buffers are enabled (FIFO mode).
-        FIFO = 1,
-    }
-
-    #[bitsize(2)]
-    #[derive(Clone, Copy, Debug, Eq, FromBits, PartialEq)]
-    /// `WLEN` Word length, field of [Line Control register](LineControl).
-    ///
-    /// These bits indicate the number of data bits transmitted or received in a
-    /// frame as follows:
-    pub enum WordLength {
-        /// b11 = 8 bits
-        _8Bits = 0b11,
-        /// b10 = 7 bits
-        _7Bits = 0b10,
-        /// b01 = 6 bits
-        _6Bits = 0b01,
-        /// b00 = 5 bits.
-        _5Bits = 0b00,
-    }
-
-    /// Control Register, `UARTCR`
-    ///
-    /// The `UARTCR` register is the control register. All the bits are cleared
-    /// to `0` on reset except for bits `9` and `8` that are set to `1`.
-    ///
-    /// # Source
-    /// ARM DDI 0183G, 3.3.8 Control Register, `UARTCR`, Table 3-12
-    #[bitsize(32)]
-    #[doc(alias = "UARTCR")]
-    #[derive(Clone, Copy, DebugBits, FromBits)]
-    pub struct Control {
-        /// `UARTEN` UART enable: 0 = UART is disabled. If the UART is disabled
-        /// in the middle of transmission or reception, it completes the current
-        /// character before stopping. 1 = the UART is enabled. Data
-        /// transmission and reception occurs for either UART signals or SIR
-        /// signals depending on the setting of the SIREN bit.
-        pub enable_uart: bool,
-        /// `SIREN` `SIR` enable: 0 = IrDA SIR ENDEC is disabled. `nSIROUT`
-        /// remains LOW (no light pulse generated), and signal transitions on
-        /// SIRIN have no effect. 1 = IrDA SIR ENDEC is enabled. Data is
-        /// transmitted and received on nSIROUT and SIRIN. UARTTXD remains HIGH,
-        /// in the marking state. Signal transitions on UARTRXD or modem status
-        /// inputs have no effect. This bit has no effect if the UARTEN bit
-        /// disables the UART.
-        pub enable_sir: bool,
-        /// `SIRLP` SIR low-power IrDA mode. This bit selects the IrDA encoding
-        /// mode. If this bit is cleared to 0, low-level bits are transmitted as
-        /// an active high pulse with a width of 3/ 16th of the bit period. If
-        /// this bit is set to 1, low-level bits are transmitted with a pulse
-        /// width that is 3 times the period of the IrLPBaud16 input signal,
-        /// regardless of the selected bit rate. Setting this bit uses less
-        /// power, but might reduce transmission distances.
-        pub sir_lowpower_irda_mode: u1,
-        /// Reserved, do not modify, read as zero.
-        _reserved_zero_no_modify: u4,
-        /// `LBE` Loopback enable. If this bit is set to 1 and the SIREN bit is
-        /// set to 1 and the SIRTEST bit in the Test Control register, UARTTCR
-        /// on page 4-5 is set to 1, then the nSIROUT path is inverted, and fed
-        /// through to the SIRIN path. The SIRTEST bit in the test register must
-        /// be set to 1 to override the normal half-duplex SIR operation. This
-        /// must be the requirement for accessing the test registers during
-        /// normal operation, and SIRTEST must be cleared to 0 when loopback
-        /// testing is finished. This feature reduces the amount of external
-        /// coupling required during system test. If this bit is set to 1, and
-        /// the SIRTEST bit is set to 0, the UARTTXD path is fed through to the
-        /// UARTRXD path. In either SIR mode or UART mode, when this bit is set,
-        /// the modem outputs are also fed through to the modem inputs. This bit
-        /// is cleared to 0 on reset, to disable loopback.
-        pub enable_loopback: bool,
-        /// `TXE` Transmit enable. If this bit is set to 1, the transmit section
-        /// of the UART is enabled. Data transmission occurs for either UART
-        /// signals, or SIR signals depending on the setting of the SIREN bit.
-        /// When the UART is disabled in the middle of transmission, it
-        /// completes the current character before stopping.
-        pub enable_transmit: bool,
-        /// `RXE` Receive enable. If this bit is set to 1, the receive section
-        /// of the UART is enabled. Data reception occurs for either UART
-        /// signals or SIR signals depending on the setting of the SIREN bit.
-        /// When the UART is disabled in the middle of reception, it completes
-        /// the current character before stopping.
-        pub enable_receive: bool,
-        /// `DTR` Data transmit ready. This bit is the complement of the UART
-        /// data transmit ready, `nUARTDTR`, modem status output. That is, when
-        /// the bit is programmed to a 1 then `nUARTDTR` is LOW.
-        pub data_transmit_ready: bool,
-        /// `RTS` Request to send. This bit is the complement of the UART
-        /// request to send, `nUARTRTS`, modem status output. That is, when the
-        /// bit is programmed to a 1 then `nUARTRTS` is LOW.
-        pub request_to_send: bool,
-        /// `Out1` This bit is the complement of the UART Out1 (`nUARTOut1`)
-        /// modem status output. That is, when the bit is programmed to a 1 the
-        /// output is 0. For DTE this can be used as Data Carrier Detect (DCD).
-        pub out_1: bool,
-        /// `Out2` This bit is the complement of the UART Out2 (`nUARTOut2`)
-        /// modem status output. That is, when the bit is programmed to a 1, the
-        /// output is 0. For DTE this can be used as Ring Indicator (RI).
-        pub out_2: bool,
-        /// `RTSEn` RTS hardware flow control enable. If this bit is set to 1,
-        /// RTS hardware flow control is enabled. Data is only requested when
-        /// there is space in the receive FIFO for it to be received.
-        pub rts_hardware_flow_control_enable: bool,
-        /// `CTSEn` CTS hardware flow control enable. If this bit is set to 1,
-        /// CTS hardware flow control is enabled. Data is only transmitted when
-        /// the `nUARTCTS` signal is asserted.
-        pub cts_hardware_flow_control_enable: bool,
-        /// 31:16 - Reserved, do not modify, read as zero.
-        _reserved_zero_no_modify2: u16,
-    }
-    impl_vmstate_bitsized!(Control);
-
-    impl Control {
-        pub fn reset(&mut self) {
-            *self = 0.into();
-            self.set_enable_receive(true);
-            self.set_enable_transmit(true);
-        }
-    }
-
-    impl Default for Control {
-        fn default() -> Self {
-            let mut ret: Self = 0.into();
-            ret.reset();
-            ret
-        }
-    }
-
-    /// Interrupt status bits in UARTRIS, UARTMIS, UARTIMSC
-    pub struct Interrupt(pub u32);
-
-    impl Interrupt {
-        pub const OE: Self = Self(1 << 10);
-        pub const BE: Self = Self(1 << 9);
-        pub const PE: Self = Self(1 << 8);
-        pub const FE: Self = Self(1 << 7);
-        pub const RT: Self = Self(1 << 6);
-        pub const TX: Self = Self(1 << 5);
-        pub const RX: Self = Self(1 << 4);
-        pub const DSR: Self = Self(1 << 3);
-        pub const DCD: Self = Self(1 << 2);
-        pub const CTS: Self = Self(1 << 1);
-        pub const RI: Self = Self(1 << 0);
-
-        pub const E: Self = Self(Self::OE.0 | Self::BE.0 | Self::PE.0 | Self::FE.0);
-        pub const MS: Self = Self(Self::RI.0 | Self::DSR.0 | Self::DCD.0 | Self::CTS.0);
-    }
-}
-
-// TODO: You must disable the UART before any of the control registers are
-// reprogrammed. When the UART is disabled in the middle of transmission or
-// reception, it completes the current character before stopping
diff --git a/rust/hw/char/pl011/src/registers.rs b/rust/hw/char/pl011/src/registers.rs
new file mode 100644
index 0000000..cd92fa2
--- /dev/null
+++ b/rust/hw/char/pl011/src/registers.rs
@@ -0,0 +1,506 @@
+// Copyright 2024, Linaro Limited
+// Author(s): Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+//! Device registers exposed as typed structs which are backed by arbitrary
+//! integer bitmaps. [`Data`], [`Control`], [`LineControl`], etc.
+
+use bilge::prelude::*;
+use qemu_api::impl_vmstate_bitsized;
+
+/// Offset of each register from the base memory address of the device.
+///
+/// # Source
+/// ARM DDI 0183G, Table 3-1 p.3-3
+#[doc(alias = "offset")]
+#[allow(non_camel_case_types)]
+#[repr(u64)]
+#[derive(Debug, Eq, PartialEq, qemu_api_macros::TryInto)]
+pub enum RegisterOffset {
+    /// Data Register
+    ///
+    /// A write to this register initiates the actual data transmission
+    #[doc(alias = "UARTDR")]
+    DR = 0x000,
+    /// Receive Status Register or Error Clear Register
+    #[doc(alias = "UARTRSR")]
+    #[doc(alias = "UARTECR")]
+    RSR = 0x004,
+    /// Flag Register
+    ///
+    /// A read of this register shows if transmission is complete
+    #[doc(alias = "UARTFR")]
+    FR = 0x018,
+    /// Fractional Baud Rate Register
+    ///
+    /// responsible for baud rate speed
+    #[doc(alias = "UARTFBRD")]
+    FBRD = 0x028,
+    /// `IrDA` Low-Power Counter Register
+    #[doc(alias = "UARTILPR")]
+    ILPR = 0x020,
+    /// Integer Baud Rate Register
+    ///
+    /// Responsible for baud rate speed
+    #[doc(alias = "UARTIBRD")]
+    IBRD = 0x024,
+    /// line control register (data frame format)
+    #[doc(alias = "UARTLCR_H")]
+    LCR_H = 0x02C,
+    /// Toggle UART, transmission or reception
+    #[doc(alias = "UARTCR")]
+    CR = 0x030,
+    /// Interrupt FIFO Level Select Register
+    #[doc(alias = "UARTIFLS")]
+    FLS = 0x034,
+    /// Interrupt Mask Set/Clear Register
+    #[doc(alias = "UARTIMSC")]
+    IMSC = 0x038,
+    /// Raw Interrupt Status Register
+    #[doc(alias = "UARTRIS")]
+    RIS = 0x03C,
+    /// Masked Interrupt Status Register
+    #[doc(alias = "UARTMIS")]
+    MIS = 0x040,
+    /// Interrupt Clear Register
+    #[doc(alias = "UARTICR")]
+    ICR = 0x044,
+    /// DMA control Register
+    #[doc(alias = "UARTDMACR")]
+    DMACR = 0x048,
+    ///// Reserved, offsets `0x04C` to `0x07C`.
+    //Reserved = 0x04C,
+}
+
+/// Receive Status Register / Data Register common error bits
+///
+/// The `UARTRSR` register is updated only when a read occurs
+/// from the `UARTDR` register with the same status information
+/// that can also be obtained by reading the `UARTDR` register
+#[bitsize(8)]
+#[derive(Clone, Copy, Default, DebugBits, FromBits)]
+pub struct Errors {
+    pub framing_error: bool,
+    pub parity_error: bool,
+    pub break_error: bool,
+    pub overrun_error: bool,
+    _reserved_unpredictable: u4,
+}
+
+// TODO: FIFO Mode has different semantics
+/// Data Register, `UARTDR`
+///
+/// The `UARTDR` register is the data register.
+///
+/// For words to be transmitted:
+///
+/// - if the FIFOs are enabled, data written to this location is pushed onto the
+///   transmit
+/// FIFO
+/// - if the FIFOs are not enabled, data is stored in the transmitter holding
+///   register (the
+/// bottom word of the transmit FIFO).
+///
+/// The write operation initiates transmission from the UART. The data is
+/// prefixed with a start bit, appended with the appropriate parity bit
+/// (if parity is enabled), and a stop bit. The resultant word is then
+/// transmitted.
+///
+/// For received words:
+///
+/// - if the FIFOs are enabled, the data byte and the 4-bit status (break,
+///   frame, parity,
+/// and overrun) is pushed onto the 12-bit wide receive FIFO
+/// - if the FIFOs are not enabled, the data byte and status are stored in the
+///   receiving
+/// holding register (the bottom word of the receive FIFO).
+///
+/// The received data byte is read by performing reads from the `UARTDR`
+/// register along with the corresponding status information. The status
+/// information can also be read by a read of the `UARTRSR/UARTECR`
+/// register.
+///
+/// # Note
+///
+/// You must disable the UART before any of the control registers are
+/// reprogrammed. When the UART is disabled in the middle of
+/// transmission or reception, it completes the current character before
+/// stopping.
+///
+/// # Source
+/// ARM DDI 0183G 3.3.1 Data Register, UARTDR
+#[bitsize(32)]
+#[derive(Clone, Copy, Default, DebugBits, FromBits)]
+#[doc(alias = "UARTDR")]
+pub struct Data {
+    pub data: u8,
+    pub errors: Errors,
+    _reserved: u16,
+}
+impl_vmstate_bitsized!(Data);
+
+impl Data {
+    // bilge is not very const-friendly, unfortunately
+    pub const BREAK: Self = Self { value: 1 << 10 };
+}
+
+// TODO: FIFO Mode has different semantics
+/// Receive Status Register / Error Clear Register, `UARTRSR/UARTECR`
+///
+/// The UARTRSR/UARTECR register is the receive status register/error clear
+/// register. Receive status can also be read from the `UARTRSR`
+/// register. If the status is read from this register, then the status
+/// information for break, framing and parity corresponds to the
+/// data character read from the [Data register](Data), `UARTDR` prior to
+/// reading the UARTRSR register. The status information for overrun is
+/// set immediately when an overrun condition occurs.
+///
+///
+/// # Note
+/// The received data character must be read first from the [Data
+/// Register](Data), `UARTDR` before reading the error status associated
+/// with that data character from the `UARTRSR` register. This read
+/// sequence cannot be reversed, because the `UARTRSR` register is
+/// updated only when a read occurs from the `UARTDR` register. However,
+/// the status information can also be obtained by reading the `UARTDR`
+/// register
+///
+/// # Source
+/// ARM DDI 0183G 3.3.2 Receive Status Register/Error Clear Register,
+/// UARTRSR/UARTECR
+#[bitsize(32)]
+#[derive(Clone, Copy, DebugBits, FromBits)]
+pub struct ReceiveStatusErrorClear {
+    pub errors: Errors,
+    _reserved_unpredictable: u24,
+}
+impl_vmstate_bitsized!(ReceiveStatusErrorClear);
+
+impl ReceiveStatusErrorClear {
+    pub fn set_from_data(&mut self, data: Data) {
+        self.set_errors(data.errors());
+    }
+
+    pub fn reset(&mut self) {
+        // All the bits are cleared to 0 on reset.
+        *self = Self::default();
+    }
+}
+
+impl Default for ReceiveStatusErrorClear {
+    fn default() -> Self {
+        0.into()
+    }
+}
+
+#[bitsize(32)]
+#[derive(Clone, Copy, DebugBits, FromBits)]
+/// Flag Register, `UARTFR`
+#[doc(alias = "UARTFR")]
+pub struct Flags {
+    /// CTS Clear to send. This bit is the complement of the UART clear to
+    /// send, `nUARTCTS`, modem status input. That is, the bit is 1
+    /// when `nUARTCTS` is LOW.
+    pub clear_to_send: bool,
+    /// DSR Data set ready. This bit is the complement of the UART data set
+    /// ready, `nUARTDSR`, modem status input. That is, the bit is 1 when
+    /// `nUARTDSR` is LOW.
+    pub data_set_ready: bool,
+    /// DCD Data carrier detect. This bit is the complement of the UART data
+    /// carrier detect, `nUARTDCD`, modem status input. That is, the bit is
+    /// 1 when `nUARTDCD` is LOW.
+    pub data_carrier_detect: bool,
+    /// BUSY UART busy. If this bit is set to 1, the UART is busy
+    /// transmitting data. This bit remains set until the complete
+    /// byte, including all the stop bits, has been sent from the
+    /// shift register. This bit is set as soon as the transmit FIFO
+    /// becomes non-empty, regardless of whether the UART is enabled
+    /// or not.
+    pub busy: bool,
+    /// RXFE Receive FIFO empty. The meaning of this bit depends on the
+    /// state of the FEN bit in the UARTLCR_H register. If the FIFO
+    /// is disabled, this bit is set when the receive holding
+    /// register is empty. If the FIFO is enabled, the RXFE bit is
+    /// set when the receive FIFO is empty.
+    pub receive_fifo_empty: bool,
+    /// TXFF Transmit FIFO full. The meaning of this bit depends on the
+    /// state of the FEN bit in the UARTLCR_H register. If the FIFO
+    /// is disabled, this bit is set when the transmit holding
+    /// register is full. If the FIFO is enabled, the TXFF bit is
+    /// set when the transmit FIFO is full.
+    pub transmit_fifo_full: bool,
+    /// RXFF Receive FIFO full. The meaning of this bit depends on the state
+    /// of the FEN bit in the UARTLCR_H register. If the FIFO is
+    /// disabled, this bit is set when the receive holding register
+    /// is full. If the FIFO is enabled, the RXFF bit is set when
+    /// the receive FIFO is full.
+    pub receive_fifo_full: bool,
+    /// Transmit FIFO empty. The meaning of this bit depends on the state of
+    /// the FEN bit in the [Line Control register](LineControl),
+    /// `UARTLCR_H`. If the FIFO is disabled, this bit is set when the
+    /// transmit holding register is empty. If the FIFO is enabled,
+    /// the TXFE bit is set when the transmit FIFO is empty. This
+    /// bit does not indicate if there is data in the transmit shift
+    /// register.
+    pub transmit_fifo_empty: bool,
+    /// `RI`, is `true` when `nUARTRI` is `LOW`.
+    pub ring_indicator: bool,
+    _reserved_zero_no_modify: u23,
+}
+impl_vmstate_bitsized!(Flags);
+
+impl Flags {
+    pub fn reset(&mut self) {
+        *self = Self::default();
+    }
+}
+
+impl Default for Flags {
+    fn default() -> Self {
+        let mut ret: Self = 0.into();
+        // After reset TXFF, RXFF, and BUSY are 0, and TXFE and RXFE are 1
+        ret.set_receive_fifo_empty(true);
+        ret.set_transmit_fifo_empty(true);
+        ret
+    }
+}
+
+#[bitsize(32)]
+#[derive(Clone, Copy, DebugBits, FromBits)]
+/// Line Control Register, `UARTLCR_H`
+#[doc(alias = "UARTLCR_H")]
+pub struct LineControl {
+    /// BRK Send break.
+    ///
+    /// If this bit is set to `1`, a low-level is continually output on the
+    /// `UARTTXD` output, after completing transmission of the
+    /// current character. For the proper execution of the break command,
+    /// the software must set this bit for at least two complete
+    /// frames. For normal use, this bit must be cleared to `0`.
+    pub send_break: bool,
+    /// 1 PEN Parity enable:
+    ///
+    /// - 0 = parity is disabled and no parity bit added to the data frame
+    /// - 1 = parity checking and generation is enabled.
+    ///
+    /// See Table 3-11 on page 3-14 for the parity truth table.
+    pub parity_enabled: bool,
+    /// EPS Even parity select. Controls the type of parity the UART uses
+    /// during transmission and reception:
+    /// - 0 = odd parity. The UART generates or checks for an odd number of 1s
+    ///   in the data and parity bits.
+    /// - 1 = even parity. The UART generates or checks for an even number of 1s
+    ///   in the data and parity bits.
+    /// This bit has no effect when the `PEN` bit disables parity checking
+    /// and generation. See Table 3-11 on page 3-14 for the parity
+    /// truth table.
+    pub parity: Parity,
+    /// 3 STP2 Two stop bits select. If this bit is set to 1, two stop bits
+    /// are transmitted at the end of the frame. The receive
+    /// logic does not check for two stop bits being received.
+    pub two_stops_bits: bool,
+    /// FEN Enable FIFOs:
+    /// 0 = FIFOs are disabled (character mode) that is, the FIFOs become
+    /// 1-byte-deep holding registers 1 = transmit and receive FIFO
+    /// buffers are enabled (FIFO mode).
+    pub fifos_enabled: Mode,
+    /// WLEN Word length. These bits indicate the number of data bits
+    /// transmitted or received in a frame as follows: b11 = 8 bits
+    /// b10 = 7 bits
+    /// b01 = 6 bits
+    /// b00 = 5 bits.
+    pub word_length: WordLength,
+    /// 7 SPS Stick parity select.
+    /// 0 = stick parity is disabled
+    /// 1 = either:
+    /// • if the EPS bit is 0 then the parity bit is transmitted and checked
+    /// as a 1 • if the EPS bit is 1 then the parity bit is
+    /// transmitted and checked as a 0. This bit has no effect when
+    /// the PEN bit disables parity checking and generation. See Table 3-11
+    /// on page 3-14 for the parity truth table.
+    pub sticky_parity: bool,
+    /// 31:8 - Reserved, do not modify, read as zero.
+    _reserved_zero_no_modify: u24,
+}
+impl_vmstate_bitsized!(LineControl);
+
+impl LineControl {
+    pub fn reset(&mut self) {
+        // All the bits are cleared to 0 when reset.
+        *self = 0.into();
+    }
+}
+
+impl Default for LineControl {
+    fn default() -> Self {
+        0.into()
+    }
+}
+
+#[bitsize(1)]
+#[derive(Clone, Copy, Debug, Eq, FromBits, PartialEq)]
+/// `EPS` "Even parity select", field of [Line Control
+/// register](LineControl).
+pub enum Parity {
+    /// - 0 = odd parity. The UART generates or checks for an odd number of 1s
+    ///   in the data and parity bits.
+    Odd = 0,
+    /// - 1 = even parity. The UART generates or checks for an even number of 1s
+    ///   in the data and parity bits.
+    Even = 1,
+}
+
+#[bitsize(1)]
+#[derive(Clone, Copy, Debug, Eq, FromBits, PartialEq)]
+/// `FEN` "Enable FIFOs" or Device mode, field of [Line Control
+/// register](LineControl).
+pub enum Mode {
+    /// 0 = FIFOs are disabled (character mode) that is, the FIFOs become
+    /// 1-byte-deep holding registers
+    Character = 0,
+    /// 1 = transmit and receive FIFO buffers are enabled (FIFO mode).
+    FIFO = 1,
+}
+
+#[bitsize(2)]
+#[derive(Clone, Copy, Debug, Eq, FromBits, PartialEq)]
+/// `WLEN` Word length, field of [Line Control register](LineControl).
+///
+/// These bits indicate the number of data bits transmitted or received in a
+/// frame as follows:
+pub enum WordLength {
+    /// b11 = 8 bits
+    _8Bits = 0b11,
+    /// b10 = 7 bits
+    _7Bits = 0b10,
+    /// b01 = 6 bits
+    _6Bits = 0b01,
+    /// b00 = 5 bits.
+    _5Bits = 0b00,
+}
+
+/// Control Register, `UARTCR`
+///
+/// The `UARTCR` register is the control register. All the bits are cleared
+/// to `0` on reset except for bits `9` and `8` that are set to `1`.
+///
+/// # Source
+/// ARM DDI 0183G, 3.3.8 Control Register, `UARTCR`, Table 3-12
+#[bitsize(32)]
+#[doc(alias = "UARTCR")]
+#[derive(Clone, Copy, DebugBits, FromBits)]
+pub struct Control {
+    /// `UARTEN` UART enable: 0 = UART is disabled. If the UART is disabled
+    /// in the middle of transmission or reception, it completes the current
+    /// character before stopping. 1 = the UART is enabled. Data
+    /// transmission and reception occurs for either UART signals or SIR
+    /// signals depending on the setting of the SIREN bit.
+    pub enable_uart: bool,
+    /// `SIREN` `SIR` enable: 0 = IrDA SIR ENDEC is disabled. `nSIROUT`
+    /// remains LOW (no light pulse generated), and signal transitions on
+    /// SIRIN have no effect. 1 = IrDA SIR ENDEC is enabled. Data is
+    /// transmitted and received on nSIROUT and SIRIN. UARTTXD remains HIGH,
+    /// in the marking state. Signal transitions on UARTRXD or modem status
+    /// inputs have no effect. This bit has no effect if the UARTEN bit
+    /// disables the UART.
+    pub enable_sir: bool,
+    /// `SIRLP` SIR low-power IrDA mode. This bit selects the IrDA encoding
+    /// mode. If this bit is cleared to 0, low-level bits are transmitted as
+    /// an active high pulse with a width of 3/ 16th of the bit period. If
+    /// this bit is set to 1, low-level bits are transmitted with a pulse
+    /// width that is 3 times the period of the IrLPBaud16 input signal,
+    /// regardless of the selected bit rate. Setting this bit uses less
+    /// power, but might reduce transmission distances.
+    pub sir_lowpower_irda_mode: u1,
+    /// Reserved, do not modify, read as zero.
+    _reserved_zero_no_modify: u4,
+    /// `LBE` Loopback enable. If this bit is set to 1 and the SIREN bit is
+    /// set to 1 and the SIRTEST bit in the Test Control register, UARTTCR
+    /// on page 4-5 is set to 1, then the nSIROUT path is inverted, and fed
+    /// through to the SIRIN path. The SIRTEST bit in the test register must
+    /// be set to 1 to override the normal half-duplex SIR operation. This
+    /// must be the requirement for accessing the test registers during
+    /// normal operation, and SIRTEST must be cleared to 0 when loopback
+    /// testing is finished. This feature reduces the amount of external
+    /// coupling required during system test. If this bit is set to 1, and
+    /// the SIRTEST bit is set to 0, the UARTTXD path is fed through to the
+    /// UARTRXD path. In either SIR mode or UART mode, when this bit is set,
+    /// the modem outputs are also fed through to the modem inputs. This bit
+    /// is cleared to 0 on reset, to disable loopback.
+    pub enable_loopback: bool,
+    /// `TXE` Transmit enable. If this bit is set to 1, the transmit section
+    /// of the UART is enabled. Data transmission occurs for either UART
+    /// signals, or SIR signals depending on the setting of the SIREN bit.
+    /// When the UART is disabled in the middle of transmission, it
+    /// completes the current character before stopping.
+    pub enable_transmit: bool,
+    /// `RXE` Receive enable. If this bit is set to 1, the receive section
+    /// of the UART is enabled. Data reception occurs for either UART
+    /// signals or SIR signals depending on the setting of the SIREN bit.
+    /// When the UART is disabled in the middle of reception, it completes
+    /// the current character before stopping.
+    pub enable_receive: bool,
+    /// `DTR` Data transmit ready. This bit is the complement of the UART
+    /// data transmit ready, `nUARTDTR`, modem status output. That is, when
+    /// the bit is programmed to a 1 then `nUARTDTR` is LOW.
+    pub data_transmit_ready: bool,
+    /// `RTS` Request to send. This bit is the complement of the UART
+    /// request to send, `nUARTRTS`, modem status output. That is, when the
+    /// bit is programmed to a 1 then `nUARTRTS` is LOW.
+    pub request_to_send: bool,
+    /// `Out1` This bit is the complement of the UART Out1 (`nUARTOut1`)
+    /// modem status output. That is, when the bit is programmed to a 1 the
+    /// output is 0. For DTE this can be used as Data Carrier Detect (DCD).
+    pub out_1: bool,
+    /// `Out2` This bit is the complement of the UART Out2 (`nUARTOut2`)
+    /// modem status output. That is, when the bit is programmed to a 1, the
+    /// output is 0. For DTE this can be used as Ring Indicator (RI).
+    pub out_2: bool,
+    /// `RTSEn` RTS hardware flow control enable. If this bit is set to 1,
+    /// RTS hardware flow control is enabled. Data is only requested when
+    /// there is space in the receive FIFO for it to be received.
+    pub rts_hardware_flow_control_enable: bool,
+    /// `CTSEn` CTS hardware flow control enable. If this bit is set to 1,
+    /// CTS hardware flow control is enabled. Data is only transmitted when
+    /// the `nUARTCTS` signal is asserted.
+    pub cts_hardware_flow_control_enable: bool,
+    /// 31:16 - Reserved, do not modify, read as zero.
+    _reserved_zero_no_modify2: u16,
+}
+impl_vmstate_bitsized!(Control);
+
+impl Control {
+    pub fn reset(&mut self) {
+        *self = 0.into();
+        self.set_enable_receive(true);
+        self.set_enable_transmit(true);
+    }
+}
+
+impl Default for Control {
+    fn default() -> Self {
+        let mut ret: Self = 0.into();
+        ret.reset();
+        ret
+    }
+}
+
+/// Interrupt status bits in UARTRIS, UARTMIS, UARTIMSC
+pub struct Interrupt(pub u32);
+
+impl Interrupt {
+    pub const OE: Self = Self(1 << 10);
+    pub const BE: Self = Self(1 << 9);
+    pub const PE: Self = Self(1 << 8);
+    pub const FE: Self = Self(1 << 7);
+    pub const RT: Self = Self(1 << 6);
+    pub const TX: Self = Self(1 << 5);
+    pub const RX: Self = Self(1 << 4);
+    pub const DSR: Self = Self(1 << 3);
+    pub const DCD: Self = Self(1 << 2);
+    pub const CTS: Self = Self(1 << 1);
+    pub const RI: Self = Self(1 << 0);
+
+    pub const E: Self = Self(Self::OE.0 | Self::BE.0 | Self::PE.0 | Self::FE.0);
+    pub const MS: Self = Self(Self::RI.0 | Self::DSR.0 | Self::DCD.0 | Self::CTS.0);
+}
diff --git a/rust/hw/timer/hpet/src/hpet.rs b/rust/hw/timer/hpet/src/hpet.rs
index be27eb0..20e0afd 100644
--- a/rust/hw/timer/hpet/src/hpet.rs
+++ b/rust/hw/timer/hpet/src/hpet.rs
@@ -4,6 +4,7 @@
 
 use std::{
     ffi::CStr,
+    pin::Pin,
     ptr::{addr_of_mut, null_mut, NonNull},
     slice::from_ref,
 };
@@ -47,8 +48,6 @@ const RTC_ISA_IRQ: usize = 8;
 const HPET_CLK_PERIOD: u64 = 10; // 10 ns
 const FS_PER_NS: u64 = 1000000; // 1000000 femtoseconds == 1 ns
 
-/// General Capabilities and ID Register
-const HPET_CAP_REG: u64 = 0x000;
 /// Revision ID (bits 0:7). Revision 1 is implemented (refer to v1.0a spec).
 const HPET_CAP_REV_ID_VALUE: u64 = 0x1;
 const HPET_CAP_REV_ID_SHIFT: usize = 0;
@@ -64,8 +63,6 @@ const HPET_CAP_VENDER_ID_SHIFT: usize = 16;
 /// Main Counter Tick Period (bits 32:63)
 const HPET_CAP_CNT_CLK_PERIOD_SHIFT: usize = 32;
 
-/// General Configuration Register
-const HPET_CFG_REG: u64 = 0x010;
 /// Overall Enable (bit 0)
 const HPET_CFG_ENABLE_SHIFT: usize = 0;
 /// Legacy Replacement Route (bit 1)
@@ -73,14 +70,6 @@ const HPET_CFG_LEG_RT_SHIFT: usize = 1;
 /// Other bits are reserved.
 const HPET_CFG_WRITE_MASK: u64 = 0x003;
 
-/// General Interrupt Status Register
-const HPET_INT_STATUS_REG: u64 = 0x020;
-
-/// Main Counter Value Register
-const HPET_COUNTER_REG: u64 = 0x0f0;
-
-/// Timer N Configuration and Capability Register (masked by 0x18)
-const HPET_TN_CFG_REG: u64 = 0x000;
 /// bit 0, 7, and bits 16:31 are reserved.
 /// bit 4, 5, 15, and bits 32:64 are read-only.
 const HPET_TN_CFG_WRITE_MASK: u64 = 0x7f4e;
@@ -108,11 +97,51 @@ const HPET_TN_CFG_FSB_CAP_SHIFT: usize = 15;
 /// Timer N Interrupt Routing Capability (bits 32:63)
 const HPET_TN_CFG_INT_ROUTE_CAP_SHIFT: usize = 32;
 
-/// Timer N Comparator Value Register (masked by 0x18)
-const HPET_TN_CMP_REG: u64 = 0x008;
+#[derive(qemu_api_macros::TryInto)]
+#[repr(u64)]
+#[allow(non_camel_case_types)]
+/// Timer registers, masked by 0x18
+enum TimerRegister {
+    /// Timer N Configuration and Capability Register
+    CFG = 0,
+    /// Timer N Comparator Value Register
+    CMP = 8,
+    /// Timer N FSB Interrupt Route Register
+    ROUTE = 16,
+}
+
+#[derive(qemu_api_macros::TryInto)]
+#[repr(u64)]
+#[allow(non_camel_case_types)]
+/// Global registers
+enum GlobalRegister {
+    /// General Capabilities and ID Register
+    CAP = 0,
+    /// General Configuration Register
+    CFG = 0x10,
+    /// General Interrupt Status Register
+    INT_STATUS = 0x20,
+    /// Main Counter Value Register
+    COUNTER = 0xF0,
+}
 
-/// Timer N FSB Interrupt Route Register (masked by 0x18)
-const HPET_TN_FSB_ROUTE_REG: u64 = 0x010;
+enum HPETRegister<'a> {
+    /// Global register in the range from `0` to `0xff`
+    Global(GlobalRegister),
+
+    /// Register in the timer block `0x100`...`0x3ff`
+    Timer(&'a BqlRefCell<HPETTimer>, TimerRegister),
+
+    /// Invalid address
+    #[allow(dead_code)]
+    Unknown(hwaddr),
+}
+
+struct HPETAddrDecode<'a> {
+    shift: u32,
+    len: u32,
+    reg: HPETRegister<'a>,
+}
 
 const fn hpet_next_wrap(cur_tick: u64) -> u64 {
     (cur_tick | 0xffffffff) + 1
@@ -151,14 +180,14 @@ fn timer_handler(timer_cell: &BqlRefCell<HPETTimer>) {
 
 /// HPET Timer Abstraction
 #[repr(C)]
-#[derive(Debug, Default, qemu_api_macros::offsets)]
+#[derive(Debug, qemu_api_macros::offsets)]
 pub struct HPETTimer {
     /// timer N index within the timer block (`HPETState`)
     #[doc(alias = "tn")]
     index: usize,
-    qemu_timer: Option<Box<Timer>>,
+    qemu_timer: Timer,
     /// timer block abstraction containing this timer
-    state: Option<NonNull<HPETState>>,
+    state: NonNull<HPETState>,
 
     // Memory-mapped, software visible timer registers
     /// Timer N Configuration and Capability Register
@@ -181,32 +210,39 @@ pub struct HPETTimer {
 }
 
 impl HPETTimer {
-    fn init(&mut self, index: usize, state_ptr: *mut HPETState) -> &mut Self {
-        *self = HPETTimer::default();
-        self.index = index;
-        self.state = NonNull::new(state_ptr);
-        self
-    }
-
-    fn init_timer_with_state(&mut self) {
-        self.qemu_timer = Some(Box::new({
-            let mut t = Timer::new();
-            t.init_full(
-                None,
-                CLOCK_VIRTUAL,
-                Timer::NS,
-                0,
-                timer_handler,
-                &self.get_state().timers[self.index],
-            );
-            t
-        }));
+    fn init(&mut self, index: usize, state: &HPETState) {
+        *self = HPETTimer {
+            index,
+            // SAFETY: the HPETTimer will only be used after the timer
+            // is initialized below.
+            qemu_timer: unsafe { Timer::new() },
+            state: NonNull::new(state as *const _ as *mut _).unwrap(),
+            config: 0,
+            cmp: 0,
+            fsb: 0,
+            cmp64: 0,
+            period: 0,
+            wrap_flag: 0,
+            last: 0,
+        };
+
+        // SAFETY: HPETTimer is only used as part of HPETState, which is
+        // always pinned.
+        let qemu_timer = unsafe { Pin::new_unchecked(&mut self.qemu_timer) };
+        qemu_timer.init_full(
+            None,
+            CLOCK_VIRTUAL,
+            Timer::NS,
+            0,
+            timer_handler,
+            &state.timers[self.index],
+        )
     }
 
     fn get_state(&self) -> &HPETState {
         // SAFETY:
         // the pointer is convertible to a reference
-        unsafe { self.state.unwrap().as_ref() }
+        unsafe { self.state.as_ref() }
     }
 
     fn is_int_active(&self) -> bool {
@@ -330,7 +366,7 @@ impl HPETTimer {
         }
 
         self.last = ns;
-        self.qemu_timer.as_ref().unwrap().modify(self.last);
+        self.qemu_timer.modify(self.last);
     }
 
     fn set_timer(&mut self) {
@@ -353,7 +389,7 @@ impl HPETTimer {
     fn del_timer(&mut self) {
         // Just remove the timer from the timer_list without destroying
         // this timer instance.
-        self.qemu_timer.as_ref().unwrap().delete();
+        self.qemu_timer.delete();
 
         if self.is_int_active() {
             // For level-triggered interrupt, this leaves interrupt status
@@ -463,33 +499,21 @@ impl HPETTimer {
         self.update_irq(true);
     }
 
-    const fn read(&self, addr: hwaddr, _size: u32) -> u64 {
-        let shift: u64 = (addr & 4) * 8;
-
-        match addr & !4 {
-            HPET_TN_CFG_REG => self.config >> shift, // including interrupt capabilities
-            HPET_TN_CMP_REG => self.cmp >> shift,    // comparator register
-            HPET_TN_FSB_ROUTE_REG => self.fsb >> shift,
-            _ => {
-                // TODO: Add trace point - trace_hpet_ram_read_invalid()
-                // Reserved.
-                0
-            }
+    const fn read(&self, reg: TimerRegister) -> u64 {
+        use TimerRegister::*;
+        match reg {
+            CFG => self.config, // including interrupt capabilities
+            CMP => self.cmp,    // comparator register
+            ROUTE => self.fsb,
         }
     }
 
-    fn write(&mut self, addr: hwaddr, value: u64, size: u32) {
-        let shift = ((addr & 4) * 8) as u32;
-        let len = std::cmp::min(size * 8, 64 - shift);
-
-        match addr & !4 {
-            HPET_TN_CFG_REG => self.set_tn_cfg_reg(shift, len, value),
-            HPET_TN_CMP_REG => self.set_tn_cmp_reg(shift, len, value),
-            HPET_TN_FSB_ROUTE_REG => self.set_tn_fsb_route_reg(shift, len, value),
-            _ => {
-                // TODO: Add trace point - trace_hpet_ram_write_invalid()
-                // Reserved.
-            }
+    fn write(&mut self, reg: TimerRegister, value: u64, shift: u32, len: u32) {
+        use TimerRegister::*;
+        match reg {
+            CFG => self.set_tn_cfg_reg(shift, len, value),
+            CMP => self.set_tn_cmp_reg(shift, len, value),
+            ROUTE => self.set_tn_fsb_route_reg(shift, len, value),
         }
     }
 }
@@ -581,13 +605,8 @@ impl HPETState {
     }
 
     fn init_timer(&self) {
-        let raw_ptr: *mut HPETState = self as *const HPETState as *mut HPETState;
-
         for (index, timer) in self.timers.iter().enumerate() {
-            timer
-                .borrow_mut()
-                .init(index, raw_ptr)
-                .init_timer_with_state();
+            timer.borrow_mut().init(index, self);
         }
     }
 
@@ -727,8 +746,6 @@ impl HPETState {
     }
 
     fn reset_hold(&self, _type: ResetType) {
-        let sbd = self.upcast::<SysBusDevice>();
-
         for timer in self.timers.iter().take(self.num_timers.get()) {
             timer.borrow_mut().reset();
         }
@@ -741,83 +758,79 @@ impl HPETState {
         HPETFwConfig::update_hpet_cfg(
             self.hpet_id.get(),
             self.capability.get() as u32,
-            sbd.mmio[0].addr,
+            self.mmio_addr(0).unwrap(),
         );
 
         // to document that the RTC lowers its output on reset as well
         self.rtc_irq_level.set(0);
     }
 
-    fn timer_and_addr(&self, addr: hwaddr) -> Option<(&BqlRefCell<HPETTimer>, hwaddr)> {
-        let timer_id: usize = ((addr - 0x100) / 0x20) as usize;
+    fn decode(&self, mut addr: hwaddr, size: u32) -> HPETAddrDecode {
+        let shift = ((addr & 4) * 8) as u32;
+        let len = std::cmp::min(size * 8, 64 - shift);
 
-        // TODO: Add trace point - trace_hpet_ram_[read|write]_timer_id(timer_id)
-        if timer_id > self.num_timers.get() {
-            // TODO: Add trace point -  trace_hpet_timer_id_out_of_range(timer_id)
-            None
+        addr &= !4;
+        let reg = if (0..=0xff).contains(&addr) {
+            GlobalRegister::try_from(addr).map(HPETRegister::Global)
         } else {
-            // Keep the complete address so that HPETTimer's read and write could
-            // detect the invalid access.
-            Some((&self.timers[timer_id], addr & 0x1F))
-        }
+            let timer_id: usize = ((addr - 0x100) / 0x20) as usize;
+            if timer_id <= self.num_timers.get() {
+                // TODO: Add trace point - trace_hpet_ram_[read|write]_timer_id(timer_id)
+                TimerRegister::try_from(addr)
+                    .map(|reg| HPETRegister::Timer(&self.timers[timer_id], reg))
+            } else {
+                // TODO: Add trace point -  trace_hpet_timer_id_out_of_range(timer_id)
+                Err(addr)
+            }
+        };
+
+        // reg is now a Result<HPETRegister, hwaddr>
+        // convert the Err case into HPETRegister as well
+        let reg = reg.unwrap_or_else(HPETRegister::Unknown);
+        HPETAddrDecode { shift, len, reg }
     }
 
     fn read(&self, addr: hwaddr, size: u32) -> u64 {
-        let shift: u64 = (addr & 4) * 8;
-
-        // address range of all TN regs
         // TODO: Add trace point - trace_hpet_ram_read(addr)
-        if (0x100..=0x3ff).contains(&addr) {
-            match self.timer_and_addr(addr) {
-                None => 0, // Reserved,
-                Some((timer, tn_addr)) => timer.borrow_mut().read(tn_addr, size),
-            }
-        } else {
-            match addr & !4 {
-                HPET_CAP_REG => self.capability.get() >> shift, /* including HPET_PERIOD 0x004 */
-                // (CNT_CLK_PERIOD field)
-                HPET_CFG_REG => self.config.get() >> shift,
-                HPET_COUNTER_REG => {
-                    let cur_tick: u64 = if self.is_hpet_enabled() {
-                        self.get_ticks()
-                    } else {
-                        self.counter.get()
-                    };
-
-                    // TODO: Add trace point - trace_hpet_ram_read_reading_counter(addr & 4,
-                    // cur_tick)
-                    cur_tick >> shift
-                }
-                HPET_INT_STATUS_REG => self.int_status.get() >> shift,
-                _ => {
-                    // TODO: Add trace point- trace_hpet_ram_read_invalid()
-                    // Reserved.
-                    0
+        let HPETAddrDecode { shift, reg, .. } = self.decode(addr, size);
+
+        use GlobalRegister::*;
+        use HPETRegister::*;
+        (match reg {
+            Timer(timer, tn_reg) => timer.borrow_mut().read(tn_reg),
+            Global(CAP) => self.capability.get(), /* including HPET_PERIOD 0x004 */
+            Global(CFG) => self.config.get(),
+            Global(INT_STATUS) => self.int_status.get(),
+            Global(COUNTER) => {
+                // TODO: Add trace point
+                // trace_hpet_ram_read_reading_counter(addr & 4, cur_tick)
+                if self.is_hpet_enabled() {
+                    self.get_ticks()
+                } else {
+                    self.counter.get()
                 }
             }
-        }
+            Unknown(_) => {
+                // TODO: Add trace point- trace_hpet_ram_read_invalid()
+                0
+            }
+        }) >> shift
     }
 
     fn write(&self, addr: hwaddr, value: u64, size: u32) {
-        let shift = ((addr & 4) * 8) as u32;
-        let len = std::cmp::min(size * 8, 64 - shift);
+        let HPETAddrDecode { shift, len, reg } = self.decode(addr, size);
 
         // TODO: Add trace point - trace_hpet_ram_write(addr, value)
-        if (0x100..=0x3ff).contains(&addr) {
-            match self.timer_and_addr(addr) {
-                None => (), // Reserved.
-                Some((timer, tn_addr)) => timer.borrow_mut().write(tn_addr, value, size),
-            }
-        } else {
-            match addr & !0x4 {
-                HPET_CAP_REG => {} // General Capabilities and ID Register: Read Only
-                HPET_CFG_REG => self.set_cfg_reg(shift, len, value),
-                HPET_INT_STATUS_REG => self.set_int_status_reg(shift, len, value),
-                HPET_COUNTER_REG => self.set_counter_reg(shift, len, value),
-                _ => {
-                    // TODO: Add trace point - trace_hpet_ram_write_invalid()
-                    // Reserved.
-                }
+        use GlobalRegister::*;
+        use HPETRegister::*;
+        match reg {
+            Timer(timer, tn_reg) => timer.borrow_mut().write(tn_reg, value, shift, len),
+            Global(CAP) => {} // General Capabilities and ID Register: Read Only
+            Global(CFG) => self.set_cfg_reg(shift, len, value),
+            Global(INT_STATUS) => self.set_int_status_reg(shift, len, value),
+            Global(COUNTER) => self.set_counter_reg(shift, len, value),
+            Unknown(_) => {
+                // TODO: Add trace point - trace_hpet_ram_write_invalid()
             }
         }
     }
diff --git a/rust/qemu-api-macros/src/lib.rs b/rust/qemu-api-macros/src/lib.rs
index 7ec2182..eda0d46 100644
--- a/rust/qemu-api-macros/src/lib.rs
+++ b/rust/qemu-api-macros/src/lib.rs
@@ -6,7 +6,7 @@ use proc_macro::TokenStream;
 use quote::quote;
 use syn::{
     parse_macro_input, parse_quote, punctuated::Punctuated, spanned::Spanned, token::Comma, Data,
-    DeriveInput, Field, Fields, Ident, Meta, Path, Token, Type, Variant, Visibility,
+    DeriveInput, Field, Fields, FieldsUnnamed, Ident, Meta, Path, Token, Type, Variant, Visibility,
 };
 
 mod utils;
@@ -33,6 +33,35 @@ fn get_fields<'a>(
     }
 }
 
+fn get_unnamed_field<'a>(input: &'a DeriveInput, msg: &str) -> Result<&'a Field, MacroError> {
+    if let Data::Struct(s) = &input.data {
+        let unnamed = match &s.fields {
+            Fields::Unnamed(FieldsUnnamed {
+                unnamed: ref fields,
+                ..
+            }) => fields,
+            _ => {
+                return Err(MacroError::Message(
+                    format!("Tuple struct required for {}", msg),
+                    s.fields.span(),
+                ))
+            }
+        };
+        if unnamed.len() != 1 {
+            return Err(MacroError::Message(
+                format!("A single field is required for {}", msg),
+                s.fields.span(),
+            ));
+        }
+        Ok(&unnamed[0])
+    } else {
+        Err(MacroError::Message(
+            format!("Struct required for {}", msg),
+            input.ident.span(),
+        ))
+    }
+}
+
 fn is_c_repr(input: &DeriveInput, msg: &str) -> Result<(), MacroError> {
     let expected = parse_quote! { #[repr(C)] };
 
@@ -46,6 +75,19 @@ fn is_c_repr(input: &DeriveInput, msg: &str) -> Result<(), MacroError> {
     }
 }
 
+fn is_transparent_repr(input: &DeriveInput, msg: &str) -> Result<(), MacroError> {
+    let expected = parse_quote! { #[repr(transparent)] };
+
+    if input.attrs.iter().any(|attr| attr == &expected) {
+        Ok(())
+    } else {
+        Err(MacroError::Message(
+            format!("#[repr(transparent)] required for {}", msg),
+            input.ident.span(),
+        ))
+    }
+}
+
 fn derive_object_or_error(input: DeriveInput) -> Result<proc_macro2::TokenStream, MacroError> {
     is_c_repr(&input, "#[derive(Object)]")?;
 
@@ -72,6 +114,52 @@ pub fn derive_object(input: TokenStream) -> TokenStream {
     TokenStream::from(expanded)
 }
 
+fn derive_opaque_or_error(input: DeriveInput) -> Result<proc_macro2::TokenStream, MacroError> {
+    is_transparent_repr(&input, "#[derive(Wrapper)]")?;
+
+    let name = &input.ident;
+    let field = &get_unnamed_field(&input, "#[derive(Wrapper)]")?;
+    let typ = &field.ty;
+
+    // TODO: how to add "::qemu_api"?  For now, this is only used in the
+    // qemu_api crate so it's not a problem.
+    Ok(quote! {
+        unsafe impl crate::cell::Wrapper for #name {
+            type Wrapped = <#typ as crate::cell::Wrapper>::Wrapped;
+        }
+        impl #name {
+            pub unsafe fn from_raw<'a>(ptr: *mut <Self as crate::cell::Wrapper>::Wrapped) -> &'a Self {
+                let ptr = ::std::ptr::NonNull::new(ptr).unwrap().cast::<Self>();
+                unsafe { ptr.as_ref() }
+            }
+
+            pub const fn as_mut_ptr(&self) -> *mut <Self as crate::cell::Wrapper>::Wrapped {
+                self.0.as_mut_ptr()
+            }
+
+            pub const fn as_ptr(&self) -> *const <Self as crate::cell::Wrapper>::Wrapped {
+                self.0.as_ptr()
+            }
+
+            pub const fn as_void_ptr(&self) -> *mut ::core::ffi::c_void {
+                self.0.as_void_ptr()
+            }
+
+            pub const fn raw_get(slot: *mut Self) -> *mut <Self as crate::cell::Wrapper>::Wrapped {
+                slot.cast()
+            }
+        }
+    })
+}
+
+#[proc_macro_derive(Wrapper)]
+pub fn derive_opaque(input: TokenStream) -> TokenStream {
+    let input = parse_macro_input!(input as DeriveInput);
+    let expanded = derive_opaque_or_error(input).unwrap_or_else(Into::into);
+
+    TokenStream::from(expanded)
+}
+
 #[rustfmt::skip::macros(quote)]
 fn derive_offsets_or_error(input: DeriveInput) -> Result<proc_macro2::TokenStream, MacroError> {
     is_c_repr(&input, "#[derive(offsets)]")?;
diff --git a/rust/qemu-api/meson.build b/rust/qemu-api/meson.build
index bcf1cf7..a3f226c 100644
--- a/rust/qemu-api/meson.build
+++ b/rust/qemu-api/meson.build
@@ -42,22 +42,31 @@ _qemu_api_rs = static_library(
   override_options: ['rust_std=2021', 'build.rust_std=2021'],
   rust_abi: 'rust',
   rust_args: _qemu_api_cfg,
-  dependencies: libc_dep,
+  dependencies: [libc_dep, qemu_api_macros],
 )
 
 rust.test('rust-qemu-api-tests', _qemu_api_rs,
           suite: ['unit', 'rust'])
 
-qemu_api = declare_dependency(
-  link_with: _qemu_api_rs,
-  dependencies: qemu_api_macros,
-)
+qemu_api = declare_dependency(link_with: _qemu_api_rs)
 
 # Rust executables do not support objects, so add an intermediate step.
 rust_qemu_api_objs = static_library(
     'rust_qemu_api_objs',
     objects: [libqom.extract_all_objects(recursive: false),
-              libhwcore.extract_all_objects(recursive: false)])
+              libhwcore.extract_all_objects(recursive: false),
+              libchardev.extract_all_objects(recursive: false),
+              libcrypto.extract_all_objects(recursive: false),
+              libauthz.extract_all_objects(recursive: false),
+              libio.extract_all_objects(recursive: false)])
+rust_qemu_api_deps = declare_dependency(
+    dependencies: [
+      qom_ss.dependencies(),
+      chardev_ss.dependencies(),
+      crypto_ss.dependencies(),
+      authz_ss.dependencies(),
+      io_ss.dependencies()],
+    link_whole: [rust_qemu_api_objs, libqemuutil])
 
 test('rust-qemu-api-integration',
     executable(
@@ -66,8 +75,7 @@ test('rust-qemu-api-integration',
         override_options: ['rust_std=2021', 'build.rust_std=2021'],
         rust_args: ['--test'],
         install: false,
-        dependencies: [qemu_api, qemu_api_macros],
-        link_whole: [rust_qemu_api_objs, libqemuutil]),
+        dependencies: [qemu_api, qemu_api_macros, rust_qemu_api_deps]),
     args: [
         '--test', '--test-threads', '1',
         '--format', 'pretty',
diff --git a/rust/qemu-api/src/bindings.rs b/rust/qemu-api/src/bindings.rs
index d286863..3c1d297 100644
--- a/rust/qemu-api/src/bindings.rs
+++ b/rust/qemu-api/src/bindings.rs
@@ -25,33 +25,11 @@ include!(concat!(env!("OUT_DIR"), "/bindings.inc.rs"));
 
 // SAFETY: these are implemented in C; the bindings need to assert that the
 // BQL is taken, either directly or via `BqlCell` and `BqlRefCell`.
-unsafe impl Send for BusState {}
-unsafe impl Sync for BusState {}
-
+// When bindings for character devices are introduced, this can be
+// moved to the Opaque<> wrapper in src/chardev.rs.
 unsafe impl Send for CharBackend {}
 unsafe impl Sync for CharBackend {}
 
-unsafe impl Send for Chardev {}
-unsafe impl Sync for Chardev {}
-
-unsafe impl Send for Clock {}
-unsafe impl Sync for Clock {}
-
-unsafe impl Send for DeviceState {}
-unsafe impl Sync for DeviceState {}
-
-unsafe impl Send for MemoryRegion {}
-unsafe impl Sync for MemoryRegion {}
-
-unsafe impl Send for ObjectClass {}
-unsafe impl Sync for ObjectClass {}
-
-unsafe impl Send for Object {}
-unsafe impl Sync for Object {}
-
-unsafe impl Send for SysBusDevice {}
-unsafe impl Sync for SysBusDevice {}
-
 // SAFETY: this is a pure data struct
 unsafe impl Send for CoalescedMemoryRange {}
 unsafe impl Sync for CoalescedMemoryRange {}
diff --git a/rust/qemu-api/src/cell.rs b/rust/qemu-api/src/cell.rs
index eae4e2c..ab0785a 100644
--- a/rust/qemu-api/src/cell.rs
+++ b/rust/qemu-api/src/cell.rs
@@ -27,7 +27,7 @@
 // IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 // DEALINGS IN THE SOFTWARE.
 
-//! BQL-protected mutable containers.
+//! QEMU-specific mutable containers
 //!
 //! Rust memory safety is based on this rule: Given an object `T`, it is only
 //! possible to have one of the following:
@@ -43,8 +43,10 @@
 //! usually have their pointer shared with the "outside world very early in
 //! their lifetime", for example when they create their
 //! [`MemoryRegion`s](crate::bindings::MemoryRegion).  Therefore, individual
-//! parts of a  device must be made mutable in a controlled manner through the
-//! use of cell types.
+//! parts of a  device must be made mutable in a controlled manner; this module
+//! provides the tools to do so.
+//!
+//! ## Cell types
 //!
 //! [`BqlCell<T>`] and [`BqlRefCell<T>`] allow doing this via the Big QEMU Lock.
 //! While they are essentially the same single-threaded primitives that are
@@ -71,7 +73,35 @@
 //! QEMU device implementations is usually incorrect and can lead to
 //! thread-safety issues.
 //!
-//! ## `BqlCell<T>`
+//! ### Example
+//!
+//! ```
+//! # use qemu_api::prelude::*;
+//! # use qemu_api::{c_str, cell::BqlRefCell, irq::InterruptSource, irq::IRQState};
+//! # use qemu_api::{sysbus::SysBusDevice, qom::Owned, qom::ParentField};
+//! # const N_GPIOS: usize = 8;
+//! # struct PL061Registers { /* ... */ }
+//! # unsafe impl ObjectType for PL061State {
+//! #     type Class = <SysBusDevice as ObjectType>::Class;
+//! #     const TYPE_NAME: &'static std::ffi::CStr = c_str!("pl061");
+//! # }
+//! struct PL061State {
+//!     parent_obj: ParentField<SysBusDevice>,
+//!
+//!     // Configuration is read-only after initialization
+//!     pullups: u32,
+//!     pulldowns: u32,
+//!
+//!     // Single values shared with C code use BqlCell, in this case via InterruptSource
+//!     out: [InterruptSource; N_GPIOS],
+//!     interrupt: InterruptSource,
+//!
+//!     // Larger state accessed by device methods uses BqlRefCell or Mutex
+//!     registers: BqlRefCell<PL061Registers>,
+//! }
+//! ```
+//!
+//! ### `BqlCell<T>`
 //!
 //! [`BqlCell<T>`] implements interior mutability by moving values in and out of
 //! the cell. That is, an `&mut T` to the inner value can never be obtained as
@@ -91,7 +121,7 @@
 //!    - [`set`](BqlCell::set): this method replaces the interior value,
 //!      dropping the replaced value.
 //!
-//! ## `BqlRefCell<T>`
+//! ### `BqlRefCell<T>`
 //!
 //! [`BqlRefCell<T>`] uses Rust's lifetimes to implement "dynamic borrowing", a
 //! process whereby one can claim temporary, exclusive, mutable access to the
@@ -111,13 +141,82 @@
 //! Multiple immutable borrows are allowed via [`borrow`](BqlRefCell::borrow),
 //! or a single mutable borrow via [`borrow_mut`](BqlRefCell::borrow_mut).  The
 //! thread will panic if these rules are violated or if the BQL is not held.
+//!
+//! ## Opaque wrappers
+//!
+//! The cell types from the previous section are useful at the boundaries
+//! of code that requires interior mutability.  When writing glue code that
+//! interacts directly with C structs, however, it is useful to operate
+//! at a lower level.
+//!
+//! C functions often violate Rust's fundamental assumptions about memory
+//! safety by modifying memory even if it is shared.  Furthermore, C structs
+//! often start their life uninitialized and may be populated lazily.
+//!
+//! For this reason, this module provides the [`Opaque<T>`] type to opt out
+//! of Rust's usual guarantees about the wrapped type. Access to the wrapped
+//! value is always through raw pointers, obtained via methods like
+//! [`as_mut_ptr()`](Opaque::as_mut_ptr) and [`as_ptr()`](Opaque::as_ptr). These
+//! pointers can then be passed to C functions or dereferenced; both actions
+//! require `unsafe` blocks, making it clear where safety guarantees must be
+//! manually verified. For example
+//!
+//! ```ignore
+//! unsafe {
+//!     let state = Opaque::<MyStruct>::uninit();
+//!     qemu_struct_init(state.as_mut_ptr());
+//! }
+//! ```
+//!
+//! [`Opaque<T>`] will usually be wrapped one level further, so that
+//! bridge methods can be added to the wrapper:
+//!
+//! ```ignore
+//! pub struct MyStruct(Opaque<bindings::MyStruct>);
+//!
+//! impl MyStruct {
+//!     fn new() -> Pin<Box<MyStruct>> {
+//!         let result = Box::pin(unsafe { Opaque::uninit() });
+//!         unsafe { qemu_struct_init(result.as_mut_ptr()) };
+//!         result
+//!     }
+//! }
+//! ```
+//!
+//! This pattern of wrapping bindgen-generated types in [`Opaque<T>`] provides
+//! several advantages:
+//!
+//! * The choice of traits to be implemented is not limited by the
+//!   bindgen-generated code.  For example, [`Drop`] can be added without
+//!   disabling [`Copy`] on the underlying bindgen type
+//!
+//! * [`Send`] and [`Sync`] implementations can be controlled by the wrapper
+//!   type rather than being automatically derived from the C struct's layout
+//!
+//! * Methods can be implemented in a separate crate from the bindgen-generated
+//!   bindings
+//!
+//! * [`Debug`](std::fmt::Debug) and [`Display`](std::fmt::Display)
+//!   implementations can be customized to be more readable than the raw C
+//!   struct representation
+//!
+//! The [`Opaque<T>`] type does not include BQL validation; it is possible to
+//! assert in the code that the right lock is taken, to use it together
+//! with a custom lock guard type, or to let C code take the lock, as
+//! appropriate.  It is also possible to use it with non-thread-safe
+//! types, since by default (unlike [`BqlCell`] and [`BqlRefCell`]
+//! it is neither `Sync` nor `Send`.
+//!
+//! While [`Opaque<T>`] is necessary for C interop, it should be used sparingly
+//! and only at FFI boundaries. For QEMU-specific types that need interior
+//! mutability, prefer [`BqlCell`] or [`BqlRefCell`].
 
 use std::{
     cell::{Cell, UnsafeCell},
     cmp::Ordering,
     fmt,
-    marker::PhantomData,
-    mem,
+    marker::{PhantomData, PhantomPinned},
+    mem::{self, MaybeUninit},
     ops::{Deref, DerefMut},
     ptr::NonNull,
 };
@@ -840,3 +939,167 @@ impl<T: fmt::Display> fmt::Display for BqlRefMut<'_, T> {
         (**self).fmt(f)
     }
 }
+
+/// Stores an opaque value that is shared with C code.
+///
+/// Often, C structs can changed when calling a C function even if they are
+/// behind a shared Rust reference, or they can be initialized lazily and have
+/// invalid bit patterns (e.g. `3` for a [`bool`]).  This goes against Rust's
+/// strict aliasing rules, which normally prevent mutation through shared
+/// references.
+///
+/// Wrapping the struct with `Opaque<T>` ensures that the Rust compiler does not
+/// assume the usual constraints that Rust structs require, and allows using
+/// shared references on the Rust side.
+///
+/// `Opaque<T>` is `#[repr(transparent)]`, so that it matches the memory layout
+/// of `T`.
+#[repr(transparent)]
+pub struct Opaque<T> {
+    value: UnsafeCell<MaybeUninit<T>>,
+    // PhantomPinned also allows multiple references to the `Opaque<T>`, i.e.
+    // one `&mut Opaque<T>` can coexist with a `&mut T` or any number of `&T`;
+    // see https://docs.rs/pinned-aliasable/latest/pinned_aliasable/.
+    _pin: PhantomPinned,
+}
+
+impl<T> Opaque<T> {
+    /// Creates a new shared reference from a C pointer
+    ///
+    /// # Safety
+    ///
+    /// The pointer must be valid, though it need not point to a valid value.
+    pub unsafe fn from_raw<'a>(ptr: *mut T) -> &'a Self {
+        let ptr = NonNull::new(ptr).unwrap().cast::<Self>();
+        // SAFETY: Self is a transparent wrapper over T
+        unsafe { ptr.as_ref() }
+    }
+
+    /// Creates a new opaque object with uninitialized contents.
+    ///
+    /// # Safety
+    ///
+    /// Ultimately the pointer to the returned value will be dereferenced
+    /// in another `unsafe` block, for example when passing it to a C function,
+    /// but the functions containing the dereference are usually safe.  The
+    /// value returned from `uninit()` must be initialized and pinned before
+    /// calling them.
+    #[allow(clippy::missing_const_for_fn)]
+    pub unsafe fn uninit() -> Self {
+        Self {
+            value: UnsafeCell::new(MaybeUninit::uninit()),
+            _pin: PhantomPinned,
+        }
+    }
+
+    /// Creates a new opaque object with zeroed contents.
+    ///
+    /// # Safety
+    ///
+    /// Ultimately the pointer to the returned value will be dereferenced
+    /// in another `unsafe` block, for example when passing it to a C function,
+    /// but the functions containing the dereference are usually safe.  The
+    /// value returned from `uninit()` must be pinned (and possibly initialized)
+    /// before calling them.
+    #[allow(clippy::missing_const_for_fn)]
+    pub unsafe fn zeroed() -> Self {
+        Self {
+            value: UnsafeCell::new(MaybeUninit::zeroed()),
+            _pin: PhantomPinned,
+        }
+    }
+
+    /// Returns a raw mutable pointer to the opaque data.
+    pub const fn as_mut_ptr(&self) -> *mut T {
+        UnsafeCell::get(&self.value).cast()
+    }
+
+    /// Returns a raw pointer to the opaque data.
+    pub const fn as_ptr(&self) -> *const T {
+        self.as_mut_ptr() as *const _
+    }
+
+    /// Returns a raw pointer to the opaque data that can be passed to a
+    /// C function as `void *`.
+    pub const fn as_void_ptr(&self) -> *mut std::ffi::c_void {
+        UnsafeCell::get(&self.value).cast()
+    }
+
+    /// Converts a raw pointer to the wrapped type.
+    pub const fn raw_get(slot: *mut Self) -> *mut T {
+        // Compare with Linux's raw_get method, which goes through an UnsafeCell
+        // because it takes a *const Self instead.
+        slot.cast()
+    }
+}
+
+impl<T> fmt::Debug for Opaque<T> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        let mut name: String = "Opaque<".to_string();
+        name += std::any::type_name::<T>();
+        name += ">";
+        f.debug_tuple(&name).field(&self.as_ptr()).finish()
+    }
+}
+
+impl<T: Default> Opaque<T> {
+    /// Creates a new opaque object with default contents.
+    ///
+    /// # Safety
+    ///
+    /// Ultimately the pointer to the returned value will be dereferenced
+    /// in another `unsafe` block, for example when passing it to a C function,
+    /// but the functions containing the dereference are usually safe.  The
+    /// value returned from `uninit()` must be pinned before calling them.
+    pub unsafe fn new() -> Self {
+        Self {
+            value: UnsafeCell::new(MaybeUninit::new(T::default())),
+            _pin: PhantomPinned,
+        }
+    }
+}
+
+/// Annotates [`Self`] as a transparent wrapper for another type.
+///
+/// Usually defined via the [`qemu_api_macros::Wrapper`] derive macro.
+///
+/// # Examples
+///
+/// ```
+/// # use std::mem::ManuallyDrop;
+/// # use qemu_api::cell::Wrapper;
+/// #[repr(transparent)]
+/// pub struct Example {
+///     inner: ManuallyDrop<String>,
+/// }
+///
+/// unsafe impl Wrapper for Example {
+///     type Wrapped = String;
+/// }
+/// ```
+///
+/// # Safety
+///
+/// `Self` must be a `#[repr(transparent)]` wrapper for the `Wrapped` type,
+/// whether directly or indirectly.
+///
+/// # Methods
+///
+/// By convention, types that implement Wrapper also implement the following
+/// methods:
+///
+/// ```ignore
+/// pub const unsafe fn from_raw<'a>(value: *mut Self::Wrapped) -> &'a Self;
+/// pub const unsafe fn as_mut_ptr(&self) -> *mut Self::Wrapped;
+/// pub const unsafe fn as_ptr(&self) -> *const Self::Wrapped;
+/// pub const unsafe fn raw_get(slot: *mut Self) -> *const Self::Wrapped;
+/// ```
+///
+/// They are not defined here to allow them to be `const`.
+pub unsafe trait Wrapper {
+    type Wrapped;
+}
+
+unsafe impl<T> Wrapper for Opaque<T> {
+    type Wrapped = T;
+}
diff --git a/rust/qemu-api/src/chardev.rs b/rust/qemu-api/src/chardev.rs
index 74cfb63..11e6c45 100644
--- a/rust/qemu-api/src/chardev.rs
+++ b/rust/qemu-api/src/chardev.rs
@@ -3,13 +3,255 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 //! Bindings for character devices
+//!
+//! Character devices in QEMU can run under the big QEMU lock or in a separate
+//! `GMainContext`. Here we only support the former, because the bindings
+//! enforce that the BQL is taken whenever the functions in [`CharBackend`] are
+//! called.
 
-use std::ffi::CStr;
+use std::{
+    ffi::CStr,
+    fmt::{self, Debug},
+    io::{self, ErrorKind, Write},
+    marker::PhantomPinned,
+    os::raw::{c_int, c_void},
+    ptr::addr_of_mut,
+    slice,
+};
 
-use crate::{bindings, prelude::*};
+use crate::{
+    bindings,
+    callbacks::FnCall,
+    cell::{BqlRefMut, Opaque},
+    prelude::*,
+};
+
+/// A safe wrapper around [`bindings::Chardev`].
+#[repr(transparent)]
+#[derive(qemu_api_macros::Wrapper)]
+pub struct Chardev(Opaque<bindings::Chardev>);
 
-pub type Chardev = bindings::Chardev;
 pub type ChardevClass = bindings::ChardevClass;
+pub type Event = bindings::QEMUChrEvent;
+
+/// A safe wrapper around [`bindings::CharBackend`], denoting the character
+/// back-end that is used for example by a device.  Compared to the
+/// underlying C struct it adds BQL protection, and is marked as pinned
+/// because the QOM object ([`bindings::Chardev`]) contains a pointer to
+/// the `CharBackend`.
+pub struct CharBackend {
+    inner: BqlRefCell<bindings::CharBackend>,
+    _pin: PhantomPinned,
+}
+
+impl Write for BqlRefMut<'_, bindings::CharBackend> {
+    fn flush(&mut self) -> io::Result<()> {
+        Ok(())
+    }
+
+    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+        let chr: &mut bindings::CharBackend = self;
+
+        let len = buf.len().try_into().unwrap();
+        let r = unsafe { bindings::qemu_chr_fe_write(addr_of_mut!(*chr), buf.as_ptr(), len) };
+        errno::into_io_result(r).map(|cnt| cnt as usize)
+    }
+
+    fn write_all(&mut self, buf: &[u8]) -> io::Result<()> {
+        let chr: &mut bindings::CharBackend = self;
+
+        let len = buf.len().try_into().unwrap();
+        let r = unsafe { bindings::qemu_chr_fe_write_all(addr_of_mut!(*chr), buf.as_ptr(), len) };
+        errno::into_io_result(r).and_then(|cnt| {
+            if cnt as usize == buf.len() {
+                Ok(())
+            } else {
+                Err(ErrorKind::WriteZero.into())
+            }
+        })
+    }
+}
+
+impl Debug for CharBackend {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        // SAFETY: accessed just to print the values
+        let chr = self.inner.as_ptr();
+        Debug::fmt(unsafe { &*chr }, f)
+    }
+}
+
+// FIXME: use something like PinnedDrop from the pinned_init crate
+impl Drop for CharBackend {
+    fn drop(&mut self) {
+        self.disable_handlers();
+    }
+}
+
+impl CharBackend {
+    /// Enable the front-end's character device handlers, if there is an
+    /// associated `Chardev`.
+    pub fn enable_handlers<
+        'chardev,
+        'owner: 'chardev,
+        T,
+        CanReceiveFn: for<'a> FnCall<(&'a T,), u32>,
+        ReceiveFn: for<'a, 'b> FnCall<(&'a T, &'b [u8])>,
+        EventFn: for<'a> FnCall<(&'a T, Event)>,
+    >(
+        // When "self" is dropped, the handlers are automatically disabled.
+        // However, this is not necessarily true if the owner is dropped.
+        // So require the owner to outlive the character device.
+        &'chardev self,
+        owner: &'owner T,
+        _can_receive: CanReceiveFn,
+        _receive: ReceiveFn,
+        _event: EventFn,
+    ) {
+        unsafe extern "C" fn rust_can_receive_cb<T, F: for<'a> FnCall<(&'a T,), u32>>(
+            opaque: *mut c_void,
+        ) -> c_int {
+            // SAFETY: the values are safe according to the contract of
+            // enable_handlers() and qemu_chr_fe_set_handlers()
+            let owner: &T = unsafe { &*(opaque.cast::<T>()) };
+            let r = F::call((owner,));
+            r.try_into().unwrap()
+        }
+
+        unsafe extern "C" fn rust_receive_cb<T, F: for<'a, 'b> FnCall<(&'a T, &'b [u8])>>(
+            opaque: *mut c_void,
+            buf: *const u8,
+            size: c_int,
+        ) {
+            // SAFETY: the values are safe according to the contract of
+            // enable_handlers() and qemu_chr_fe_set_handlers()
+            let owner: &T = unsafe { &*(opaque.cast::<T>()) };
+            let buf = unsafe { slice::from_raw_parts(buf, size.try_into().unwrap()) };
+            F::call((owner, buf))
+        }
+
+        unsafe extern "C" fn rust_event_cb<T, F: for<'a> FnCall<(&'a T, Event)>>(
+            opaque: *mut c_void,
+            event: Event,
+        ) {
+            // SAFETY: the values are safe according to the contract of
+            // enable_handlers() and qemu_chr_fe_set_handlers()
+            let owner: &T = unsafe { &*(opaque.cast::<T>()) };
+            F::call((owner, event))
+        }
+
+        let _: () = CanReceiveFn::ASSERT_IS_SOME;
+        let receive_cb: Option<unsafe extern "C" fn(*mut c_void, *const u8, c_int)> =
+            if ReceiveFn::is_some() {
+                Some(rust_receive_cb::<T, ReceiveFn>)
+            } else {
+                None
+            };
+        let event_cb: Option<unsafe extern "C" fn(*mut c_void, Event)> = if EventFn::is_some() {
+            Some(rust_event_cb::<T, EventFn>)
+        } else {
+            None
+        };
+
+        let mut chr = self.inner.borrow_mut();
+        // SAFETY: the borrow promises that the BQL is taken
+        unsafe {
+            bindings::qemu_chr_fe_set_handlers(
+                addr_of_mut!(*chr),
+                Some(rust_can_receive_cb::<T, CanReceiveFn>),
+                receive_cb,
+                event_cb,
+                None,
+                (owner as *const T as *mut T).cast::<c_void>(),
+                core::ptr::null_mut(),
+                true,
+            );
+        }
+    }
+
+    /// Disable the front-end's character device handlers.
+    pub fn disable_handlers(&self) {
+        let mut chr = self.inner.borrow_mut();
+        // SAFETY: the borrow promises that the BQL is taken
+        unsafe {
+            bindings::qemu_chr_fe_set_handlers(
+                addr_of_mut!(*chr),
+                None,
+                None,
+                None,
+                None,
+                core::ptr::null_mut(),
+                core::ptr::null_mut(),
+                true,
+            );
+        }
+    }
+
+    /// Notify that the frontend is ready to receive data.
+    pub fn accept_input(&self) {
+        let mut chr = self.inner.borrow_mut();
+        // SAFETY: the borrow promises that the BQL is taken
+        unsafe { bindings::qemu_chr_fe_accept_input(addr_of_mut!(*chr)) }
+    }
+
+    /// Temporarily borrow the character device, allowing it to be used
+    /// as an implementor of `Write`.  Note that it is not valid to drop
+    /// the big QEMU lock while the character device is borrowed, as
+    /// that might cause C code to write to the character device.
+    pub fn borrow_mut(&self) -> impl Write + '_ {
+        self.inner.borrow_mut()
+    }
+
+    /// Send a continuous stream of zero bits on the line if `enabled` is
+    /// true, or a short stream if `enabled` is false.
+    pub fn send_break(&self, long: bool) -> io::Result<()> {
+        let mut chr = self.inner.borrow_mut();
+        let mut duration: c_int = long.into();
+        // SAFETY: the borrow promises that the BQL is taken
+        let r = unsafe {
+            bindings::qemu_chr_fe_ioctl(
+                addr_of_mut!(*chr),
+                bindings::CHR_IOCTL_SERIAL_SET_BREAK as i32,
+                addr_of_mut!(duration).cast::<c_void>(),
+            )
+        };
+
+        errno::into_io_result(r).map(|_| ())
+    }
+
+    /// Write data to a character backend from the front end.  This function
+    /// will send data from the front end to the back end.  Unlike
+    /// `write`, this function will block if the back end cannot
+    /// consume all of the data attempted to be written.
+    ///
+    /// Returns the number of bytes consumed (0 if no associated Chardev) or an
+    /// error.
+    pub fn write(&self, buf: &[u8]) -> io::Result<usize> {
+        let len = buf.len().try_into().unwrap();
+        // SAFETY: qemu_chr_fe_write is thread-safe
+        let r = unsafe { bindings::qemu_chr_fe_write(self.inner.as_ptr(), buf.as_ptr(), len) };
+        errno::into_io_result(r).map(|cnt| cnt as usize)
+    }
+
+    /// Write data to a character backend from the front end.  This function
+    /// will send data from the front end to the back end.  Unlike
+    /// `write`, this function will block if the back end cannot
+    /// consume all of the data attempted to be written.
+    ///
+    /// Returns the number of bytes consumed (0 if no associated Chardev) or an
+    /// error.
+    pub fn write_all(&self, buf: &[u8]) -> io::Result<()> {
+        let len = buf.len().try_into().unwrap();
+        // SAFETY: qemu_chr_fe_write_all is thread-safe
+        let r = unsafe { bindings::qemu_chr_fe_write_all(self.inner.as_ptr(), buf.as_ptr(), len) };
+        errno::into_io_result(r).and_then(|cnt| {
+            if cnt as usize == buf.len() {
+                Ok(())
+            } else {
+                Err(ErrorKind::WriteZero.into())
+            }
+        })
+    }
+}
 
 unsafe impl ObjectType for Chardev {
     type Class = ChardevClass;
diff --git a/rust/qemu-api/src/irq.rs b/rust/qemu-api/src/irq.rs
index 34c1926..1222d4f 100644
--- a/rust/qemu-api/src/irq.rs
+++ b/rust/qemu-api/src/irq.rs
@@ -8,10 +8,16 @@ use std::{ffi::CStr, marker::PhantomData, os::raw::c_int, ptr};
 
 use crate::{
     bindings::{self, qemu_set_irq},
+    cell::Opaque,
     prelude::*,
     qom::ObjectClass,
 };
 
+/// An opaque wrapper around [`bindings::IRQState`].
+#[repr(transparent)]
+#[derive(Debug, qemu_api_macros::Wrapper)]
+pub struct IRQState(Opaque<bindings::IRQState>);
+
 /// Interrupt sources are used by devices to pass changes to a value (typically
 /// a boolean).  The interrupt sink is usually an interrupt controller or
 /// GPIO controller.
@@ -21,8 +27,7 @@ use crate::{
 /// method sends a `true` value to the sink.  If the guest has to see a
 /// different polarity, that change is performed by the board between the
 /// device and the interrupt controller.
-pub type IRQState = bindings::IRQState;
-
+///
 /// Interrupts are implemented as a pointer to the interrupt "sink", which has
 /// type [`IRQState`].  A device exposes its source as a QOM link property using
 /// a function such as [`SysBusDeviceMethods::init_irq`], and
@@ -40,7 +45,7 @@ pub struct InterruptSource<T = bool>
 where
     c_int: From<T>,
 {
-    cell: BqlCell<*mut IRQState>,
+    cell: BqlCell<*mut bindings::IRQState>,
     _marker: PhantomData<T>,
 }
 
@@ -79,11 +84,11 @@ where
         }
     }
 
-    pub(crate) const fn as_ptr(&self) -> *mut *mut IRQState {
+    pub(crate) const fn as_ptr(&self) -> *mut *mut bindings::IRQState {
         self.cell.as_ptr()
     }
 
-    pub(crate) const fn slice_as_ptr(slice: &[Self]) -> *mut *mut IRQState {
+    pub(crate) const fn slice_as_ptr(slice: &[Self]) -> *mut *mut bindings::IRQState {
         assert!(!slice.is_empty());
         slice[0].as_ptr()
     }
diff --git a/rust/qemu-api/src/memory.rs b/rust/qemu-api/src/memory.rs
index 682951a..fdb1ea1 100644
--- a/rust/qemu-api/src/memory.rs
+++ b/rust/qemu-api/src/memory.rs
@@ -6,9 +6,8 @@
 
 use std::{
     ffi::{CStr, CString},
-    marker::{PhantomData, PhantomPinned},
+    marker::PhantomData,
     os::raw::{c_uint, c_void},
-    ptr::addr_of,
 };
 
 pub use bindings::{hwaddr, MemTxAttrs};
@@ -16,6 +15,7 @@ pub use bindings::{hwaddr, MemTxAttrs};
 use crate::{
     bindings::{self, device_endian, memory_region_init_io},
     callbacks::FnCall,
+    cell::Opaque,
     prelude::*,
     zeroable::Zeroable,
 };
@@ -132,13 +132,13 @@ impl<T> Default for MemoryRegionOpsBuilder<T> {
     }
 }
 
-/// A safe wrapper around [`bindings::MemoryRegion`].  Compared to the
-/// underlying C struct it is marked as pinned because the QOM tree
-/// contains a pointer to it.
-pub struct MemoryRegion {
-    inner: bindings::MemoryRegion,
-    _pin: PhantomPinned,
-}
+/// A safe wrapper around [`bindings::MemoryRegion`].
+#[repr(transparent)]
+#[derive(qemu_api_macros::Wrapper)]
+pub struct MemoryRegion(Opaque<bindings::MemoryRegion>);
+
+unsafe impl Send for MemoryRegion {}
+unsafe impl Sync for MemoryRegion {}
 
 impl MemoryRegion {
     // inline to ensure that it is not included in tests, which only
@@ -157,7 +157,7 @@ impl MemoryRegion {
             let cstr = CString::new(name).unwrap();
             memory_region_init_io(
                 slot,
-                owner.cast::<Object>(),
+                owner.cast::<bindings::Object>(),
                 ops,
                 owner.cast::<c_void>(),
                 cstr.as_ptr(),
@@ -174,13 +174,15 @@ impl MemoryRegion {
         size: u64,
     ) {
         unsafe {
-            Self::do_init_io(&mut self.inner, owner.cast::<Object>(), &ops.0, name, size);
+            Self::do_init_io(
+                self.0.as_mut_ptr(),
+                owner.cast::<Object>(),
+                &ops.0,
+                name,
+                size,
+            );
         }
     }
-
-    pub(crate) const fn as_mut_ptr(&self) -> *mut bindings::MemoryRegion {
-        addr_of!(self.inner) as *mut _
-    }
 }
 
 unsafe impl ObjectType for MemoryRegion {
diff --git a/rust/qemu-api/src/prelude.rs b/rust/qemu-api/src/prelude.rs
index 634acf3..43bfcd5 100644
--- a/rust/qemu-api/src/prelude.rs
+++ b/rust/qemu-api/src/prelude.rs
@@ -17,7 +17,6 @@ pub use crate::qom::InterfaceType;
 pub use crate::qom::IsA;
 pub use crate::qom::Object;
 pub use crate::qom::ObjectCast;
-pub use crate::qom::ObjectCastMut;
 pub use crate::qom::ObjectDeref;
 pub use crate::qom::ObjectClassMethods;
 pub use crate::qom::ObjectMethods;
diff --git a/rust/qemu-api/src/qdev.rs b/rust/qemu-api/src/qdev.rs
index c136457..18b4a9b 100644
--- a/rust/qemu-api/src/qdev.rs
+++ b/rust/qemu-api/src/qdev.rs
@@ -10,12 +10,12 @@ use std::{
     ptr::NonNull,
 };
 
-pub use bindings::{Clock, ClockEvent, DeviceClass, DeviceState, Property, ResetType};
+pub use bindings::{ClockEvent, DeviceClass, Property, ResetType};
 
 use crate::{
     bindings::{self, qdev_init_gpio_in, qdev_init_gpio_out, Error, ResettableClass},
     callbacks::FnCall,
-    cell::bql_locked,
+    cell::{bql_locked, Opaque},
     chardev::Chardev,
     irq::InterruptSource,
     prelude::*,
@@ -23,6 +23,22 @@ use crate::{
     vmstate::VMStateDescription,
 };
 
+/// A safe wrapper around [`bindings::Clock`].
+#[repr(transparent)]
+#[derive(Debug, qemu_api_macros::Wrapper)]
+pub struct Clock(Opaque<bindings::Clock>);
+
+unsafe impl Send for Clock {}
+unsafe impl Sync for Clock {}
+
+/// A safe wrapper around [`bindings::DeviceState`].
+#[repr(transparent)]
+#[derive(Debug, qemu_api_macros::Wrapper)]
+pub struct DeviceState(Opaque<bindings::DeviceState>);
+
+unsafe impl Send for DeviceState {}
+unsafe impl Sync for DeviceState {}
+
 /// Trait providing the contents of the `ResettablePhases` struct,
 /// which is part of the QOM `Resettable` interface.
 pub trait ResettablePhasesImpl {
@@ -52,7 +68,7 @@ pub trait ResettablePhasesImpl {
 /// can be downcasted to type `T`. We also expect the device is
 /// readable/writeable from one thread at any time.
 unsafe extern "C" fn rust_resettable_enter_fn<T: ResettablePhasesImpl>(
-    obj: *mut Object,
+    obj: *mut bindings::Object,
     typ: ResetType,
 ) {
     let state = NonNull::new(obj).unwrap().cast::<T>();
@@ -65,7 +81,7 @@ unsafe extern "C" fn rust_resettable_enter_fn<T: ResettablePhasesImpl>(
 /// can be downcasted to type `T`. We also expect the device is
 /// readable/writeable from one thread at any time.
 unsafe extern "C" fn rust_resettable_hold_fn<T: ResettablePhasesImpl>(
-    obj: *mut Object,
+    obj: *mut bindings::Object,
     typ: ResetType,
 ) {
     let state = NonNull::new(obj).unwrap().cast::<T>();
@@ -78,7 +94,7 @@ unsafe extern "C" fn rust_resettable_hold_fn<T: ResettablePhasesImpl>(
 /// can be downcasted to type `T`. We also expect the device is
 /// readable/writeable from one thread at any time.
 unsafe extern "C" fn rust_resettable_exit_fn<T: ResettablePhasesImpl>(
-    obj: *mut Object,
+    obj: *mut bindings::Object,
     typ: ResetType,
 ) {
     let state = NonNull::new(obj).unwrap().cast::<T>();
@@ -117,7 +133,10 @@ pub trait DeviceImpl: ObjectImpl + ResettablePhasesImpl + IsA<DeviceState> {
 /// We expect the FFI user of this function to pass a valid pointer that
 /// can be downcasted to type `T`. We also expect the device is
 /// readable/writeable from one thread at any time.
-unsafe extern "C" fn rust_realize_fn<T: DeviceImpl>(dev: *mut DeviceState, _errp: *mut *mut Error) {
+unsafe extern "C" fn rust_realize_fn<T: DeviceImpl>(
+    dev: *mut bindings::DeviceState,
+    _errp: *mut *mut Error,
+) {
     let state = NonNull::new(dev).unwrap().cast::<T>();
     T::REALIZE.unwrap()(unsafe { state.as_ref() });
 }
@@ -251,7 +270,7 @@ where
         events: ClockEvent,
     ) -> Owned<Clock> {
         fn do_init_clock_in(
-            dev: *mut DeviceState,
+            dev: &DeviceState,
             name: &str,
             cb: Option<unsafe extern "C" fn(*mut c_void, ClockEvent)>,
             events: ClockEvent,
@@ -265,14 +284,15 @@ where
             unsafe {
                 let cstr = CString::new(name).unwrap();
                 let clk = bindings::qdev_init_clock_in(
-                    dev,
+                    dev.as_mut_ptr(),
                     cstr.as_ptr(),
                     cb,
-                    dev.cast::<c_void>(),
+                    dev.as_void_ptr(),
                     events.0,
                 );
 
-                Owned::from(&*clk)
+                let clk: &Clock = Clock::from_raw(clk);
+                Owned::from(clk)
             }
         }
 
@@ -289,7 +309,7 @@ where
             None
         };
 
-        do_init_clock_in(self.as_mut_ptr(), name, cb, events)
+        do_init_clock_in(self.upcast(), name, cb, events)
     }
 
     /// Add an output clock named `name`.
@@ -304,17 +324,23 @@ where
     fn init_clock_out(&self, name: &str) -> Owned<Clock> {
         unsafe {
             let cstr = CString::new(name).unwrap();
-            let clk = bindings::qdev_init_clock_out(self.as_mut_ptr(), cstr.as_ptr());
+            let clk = bindings::qdev_init_clock_out(self.upcast().as_mut_ptr(), cstr.as_ptr());
 
-            Owned::from(&*clk)
+            let clk: &Clock = Clock::from_raw(clk);
+            Owned::from(clk)
         }
     }
 
     fn prop_set_chr(&self, propname: &str, chr: &Owned<Chardev>) {
         assert!(bql_locked());
         let c_propname = CString::new(propname).unwrap();
+        let chr: &Chardev = chr;
         unsafe {
-            bindings::qdev_prop_set_chr(self.as_mut_ptr(), c_propname.as_ptr(), chr.as_mut_ptr());
+            bindings::qdev_prop_set_chr(
+                self.upcast().as_mut_ptr(),
+                c_propname.as_ptr(),
+                chr.as_mut_ptr(),
+            );
         }
     }
 
@@ -323,8 +349,17 @@ where
         num_lines: u32,
         _cb: F,
     ) {
-        let _: () = F::ASSERT_IS_SOME;
+        fn do_init_gpio_in(
+            dev: &DeviceState,
+            num_lines: u32,
+            gpio_in_cb: unsafe extern "C" fn(*mut c_void, c_int, c_int),
+        ) {
+            unsafe {
+                qdev_init_gpio_in(dev.as_mut_ptr(), Some(gpio_in_cb), num_lines as c_int);
+            }
+        }
 
+        let _: () = F::ASSERT_IS_SOME;
         unsafe extern "C" fn rust_irq_handler<T, F: for<'a> FnCall<(&'a T, u32, u32)>>(
             opaque: *mut c_void,
             line: c_int,
@@ -337,19 +372,13 @@ where
         let gpio_in_cb: unsafe extern "C" fn(*mut c_void, c_int, c_int) =
             rust_irq_handler::<Self::Target, F>;
 
-        unsafe {
-            qdev_init_gpio_in(
-                self.as_mut_ptr::<DeviceState>(),
-                Some(gpio_in_cb),
-                num_lines as c_int,
-            );
-        }
+        do_init_gpio_in(self.upcast(), num_lines, gpio_in_cb);
     }
 
     fn init_gpio_out(&self, pins: &[InterruptSource]) {
         unsafe {
             qdev_init_gpio_out(
-                self.as_mut_ptr::<DeviceState>(),
+                self.upcast().as_mut_ptr(),
                 InterruptSource::slice_as_ptr(pins),
                 pins.len() as c_int,
             );
diff --git a/rust/qemu-api/src/qom.rs b/rust/qemu-api/src/qom.rs
index 5488643..34d7bc0 100644
--- a/rust/qemu-api/src/qom.rs
+++ b/rust/qemu-api/src/qom.rs
@@ -101,16 +101,24 @@ use std::{
     ptr::NonNull,
 };
 
-pub use bindings::{Object, ObjectClass};
+pub use bindings::ObjectClass;
 
 use crate::{
     bindings::{
         self, object_class_dynamic_cast, object_dynamic_cast, object_get_class,
         object_get_typename, object_new, object_ref, object_unref, TypeInfo,
     },
-    cell::bql_locked,
+    cell::{bql_locked, Opaque},
 };
 
+/// A safe wrapper around [`bindings::Object`].
+#[repr(transparent)]
+#[derive(Debug, qemu_api_macros::Wrapper)]
+pub struct Object(Opaque<bindings::Object>);
+
+unsafe impl Send for Object {}
+unsafe impl Sync for Object {}
+
 /// Marker trait: `Self` can be statically upcasted to `P` (i.e. `P` is a direct
 /// or indirect parent of `Self`).
 ///
@@ -199,7 +207,7 @@ impl<T: fmt::Display + ObjectType> fmt::Display for ParentField<T> {
     }
 }
 
-unsafe extern "C" fn rust_instance_init<T: ObjectImpl>(obj: *mut Object) {
+unsafe extern "C" fn rust_instance_init<T: ObjectImpl>(obj: *mut bindings::Object) {
     let mut state = NonNull::new(obj).unwrap().cast::<T>();
     // SAFETY: obj is an instance of T, since rust_instance_init<T>
     // is called from QOM core as the instance_init function
@@ -209,7 +217,7 @@ unsafe extern "C" fn rust_instance_init<T: ObjectImpl>(obj: *mut Object) {
     }
 }
 
-unsafe extern "C" fn rust_instance_post_init<T: ObjectImpl>(obj: *mut Object) {
+unsafe extern "C" fn rust_instance_post_init<T: ObjectImpl>(obj: *mut bindings::Object) {
     let state = NonNull::new(obj).unwrap().cast::<T>();
     // SAFETY: obj is an instance of T, since rust_instance_post_init<T>
     // is called from QOM core as the instance_post_init function
@@ -230,7 +238,7 @@ unsafe extern "C" fn rust_class_init<T: ObjectType + ObjectImpl>(
     <T as ObjectImpl>::CLASS_INIT(unsafe { klass.as_mut() })
 }
 
-unsafe extern "C" fn drop_object<T: ObjectImpl>(obj: *mut Object) {
+unsafe extern "C" fn drop_object<T: ObjectImpl>(obj: *mut bindings::Object) {
     // SAFETY: obj is an instance of T, since drop_object<T> is called
     // from the QOM core function object_deinit() as the instance_finalize
     // function for class T.  Note that while object_deinit() will drop the
@@ -280,14 +288,14 @@ pub unsafe trait ObjectType: Sized {
     /// Return the receiver as an Object.  This is always safe, even
     /// if this type represents an interface.
     fn as_object(&self) -> &Object {
-        unsafe { &*self.as_object_ptr() }
+        unsafe { &*self.as_ptr().cast() }
     }
 
     /// Return the receiver as a const raw pointer to Object.
     /// This is preferrable to `as_object_mut_ptr()` if a C
     /// function only needs a `const Object *`.
-    fn as_object_ptr(&self) -> *const Object {
-        self.as_ptr().cast()
+    fn as_object_ptr(&self) -> *const bindings::Object {
+        self.as_object().as_ptr()
     }
 
     /// Return the receiver as a mutable raw pointer to Object.
@@ -297,8 +305,8 @@ pub unsafe trait ObjectType: Sized {
     /// This cast is always safe, but because the result is mutable
     /// and the incoming reference is not, this should only be used
     /// for calls to C functions, and only if needed.
-    unsafe fn as_object_mut_ptr(&self) -> *mut Object {
-        self.as_object_ptr() as *mut _
+    unsafe fn as_object_mut_ptr(&self) -> *mut bindings::Object {
+        self.as_object().as_mut_ptr()
     }
 }
 
@@ -455,90 +463,7 @@ where
 impl<T: ObjectType> ObjectDeref for &T {}
 impl<T: ObjectType> ObjectCast for &T {}
 
-/// Trait for mutable type casting operations in the QOM hierarchy.
-///
-/// This trait provides the mutable counterparts to [`ObjectCast`]'s conversion
-/// functions. Unlike `ObjectCast`, this trait returns `Result` for fallible
-/// conversions to preserve the original smart pointer if the cast fails. This
-/// is necessary because mutable references cannot be copied, so a failed cast
-/// must return ownership of the original reference. For example:
-///
-/// ```ignore
-/// let mut dev = get_device();
-/// // If this fails, we need the original `dev` back to try something else
-/// match dev.dynamic_cast_mut::<FooDevice>() {
-///    Ok(foodev) => /* use foodev */,
-///    Err(dev) => /* still have ownership of dev */
-/// }
-/// ```
-pub trait ObjectCastMut: Sized + ObjectDeref + DerefMut
-where
-    Self::Target: ObjectType,
-{
-    /// Safely convert from a derived type to one of its parent types.
-    ///
-    /// This is always safe; the [`IsA`] trait provides static verification
-    /// that `Self` dereferences to `U` or a child of `U`.
-    fn upcast_mut<'a, U: ObjectType>(self) -> &'a mut U
-    where
-        Self::Target: IsA<U>,
-        Self: 'a,
-    {
-        // SAFETY: soundness is declared via IsA<U>, which is an unsafe trait
-        unsafe { self.unsafe_cast_mut::<U>() }
-    }
-
-    /// Attempt to convert to a derived type.
-    ///
-    /// Returns `Ok(..)` if the object is of type `U`, or `Err(self)` if the
-    /// object if the conversion failed. This is verified at runtime by
-    /// checking the object's type information.
-    fn downcast_mut<'a, U: IsA<Self::Target>>(self) -> Result<&'a mut U, Self>
-    where
-        Self: 'a,
-    {
-        self.dynamic_cast_mut::<U>()
-    }
-
-    /// Attempt to convert between any two types in the QOM hierarchy.
-    ///
-    /// Returns `Ok(..)` if the object is of type `U`, or `Err(self)` if the
-    /// object if the conversion failed. This is verified at runtime by
-    /// checking the object's type information.
-    fn dynamic_cast_mut<'a, U: ObjectType>(self) -> Result<&'a mut U, Self>
-    where
-        Self: 'a,
-    {
-        unsafe {
-            // SAFETY: upcasting to Object is always valid, and the
-            // return type is either NULL or the argument itself
-            let result: *mut U =
-                object_dynamic_cast(self.as_object_mut_ptr(), U::TYPE_NAME.as_ptr()).cast();
-
-            result.as_mut().ok_or(self)
-        }
-    }
-
-    /// Convert to any QOM type without verification.
-    ///
-    /// # Safety
-    ///
-    /// What safety? You need to know yourself that the cast is correct; only
-    /// use when performance is paramount.  It is still better than a raw
-    /// pointer `cast()`, which does not even check that you remain in the
-    /// realm of QOM `ObjectType`s.
-    ///
-    /// `unsafe_cast::<Object>()` is always safe.
-    unsafe fn unsafe_cast_mut<'a, U: ObjectType>(self) -> &'a mut U
-    where
-        Self: 'a,
-    {
-        unsafe { &mut *self.as_mut_ptr::<Self::Target>().cast::<U>() }
-    }
-}
-
 impl<T: ObjectType> ObjectDeref for &mut T {}
-impl<T: ObjectType> ObjectCastMut for &mut T {}
 
 /// Trait a type must implement to be registered with QEMU.
 pub trait ObjectImpl: ObjectType + IsA<Object> {
@@ -621,7 +546,7 @@ pub trait ObjectImpl: ObjectType + IsA<Object> {
 /// We expect the FFI user of this function to pass a valid pointer that
 /// can be downcasted to type `T`. We also expect the device is
 /// readable/writeable from one thread at any time.
-unsafe extern "C" fn rust_unparent_fn<T: ObjectImpl>(dev: *mut Object) {
+unsafe extern "C" fn rust_unparent_fn<T: ObjectImpl>(dev: *mut bindings::Object) {
     let state = NonNull::new(dev).unwrap().cast::<T>();
     T::UNPARENT.unwrap()(unsafe { state.as_ref() });
 }
@@ -796,8 +721,9 @@ pub trait ObjectClassMethods: IsA<Object> {
         // SAFETY: the object created by object_new is allocated on
         // the heap and has a reference count of 1
         unsafe {
-            let obj = &*object_new(Self::TYPE_NAME.as_ptr());
-            Owned::from_raw(obj.unsafe_cast::<Self>())
+            let raw_obj = object_new(Self::TYPE_NAME.as_ptr());
+            let obj = Object::from_raw(raw_obj).unsafe_cast::<Self>();
+            Owned::from_raw(obj)
         }
     }
 }
diff --git a/rust/qemu-api/src/sysbus.rs b/rust/qemu-api/src/sysbus.rs
index 04821a2..e92502a 100644
--- a/rust/qemu-api/src/sysbus.rs
+++ b/rust/qemu-api/src/sysbus.rs
@@ -6,11 +6,11 @@
 
 use std::{ffi::CStr, ptr::addr_of_mut};
 
-pub use bindings::{SysBusDevice, SysBusDeviceClass};
+pub use bindings::SysBusDeviceClass;
 
 use crate::{
     bindings,
-    cell::bql_locked,
+    cell::{bql_locked, Opaque},
     irq::{IRQState, InterruptSource},
     memory::MemoryRegion,
     prelude::*,
@@ -18,6 +18,14 @@ use crate::{
     qom::Owned,
 };
 
+/// A safe wrapper around [`bindings::SysBusDevice`].
+#[repr(transparent)]
+#[derive(Debug, qemu_api_macros::Wrapper)]
+pub struct SysBusDevice(Opaque<bindings::SysBusDevice>);
+
+unsafe impl Send for SysBusDevice {}
+unsafe impl Sync for SysBusDevice {}
+
 unsafe impl ObjectType for SysBusDevice {
     type Class = SysBusDeviceClass;
     const TYPE_NAME: &'static CStr =
@@ -49,7 +57,7 @@ where
     fn init_mmio(&self, iomem: &MemoryRegion) {
         assert!(bql_locked());
         unsafe {
-            bindings::sysbus_init_mmio(self.as_mut_ptr(), iomem.as_mut_ptr());
+            bindings::sysbus_init_mmio(self.upcast().as_mut_ptr(), iomem.as_mut_ptr());
         }
     }
 
@@ -60,7 +68,21 @@ where
     fn init_irq(&self, irq: &InterruptSource) {
         assert!(bql_locked());
         unsafe {
-            bindings::sysbus_init_irq(self.as_mut_ptr(), irq.as_ptr());
+            bindings::sysbus_init_irq(self.upcast().as_mut_ptr(), irq.as_ptr());
+        }
+    }
+
+    // TODO: do we want a type like GuestAddress here?
+    fn mmio_addr(&self, id: u32) -> Option<u64> {
+        assert!(bql_locked());
+        // SAFETY: the BQL ensures that no one else writes to sbd.mmio[], and
+        // the SysBusDevice must be initialized to get an IsA<SysBusDevice>.
+        let sbd = unsafe { *self.upcast().as_ptr() };
+        let id: usize = id.try_into().unwrap();
+        if sbd.mmio[id].memory.is_null() {
+            None
+        } else {
+            Some(sbd.mmio[id].addr)
         }
     }
 
@@ -69,7 +91,7 @@ where
         assert!(bql_locked());
         let id: i32 = id.try_into().unwrap();
         unsafe {
-            bindings::sysbus_mmio_map(self.as_mut_ptr(), id, addr);
+            bindings::sysbus_mmio_map(self.upcast().as_mut_ptr(), id, addr);
         }
     }
 
@@ -79,8 +101,9 @@ where
     fn connect_irq(&self, id: u32, irq: &Owned<IRQState>) {
         assert!(bql_locked());
         let id: i32 = id.try_into().unwrap();
+        let irq: &IRQState = irq;
         unsafe {
-            bindings::sysbus_connect_irq(self.as_mut_ptr(), id, irq.as_mut_ptr());
+            bindings::sysbus_connect_irq(self.upcast().as_mut_ptr(), id, irq.as_mut_ptr());
         }
     }
 
@@ -88,7 +111,10 @@ where
         // TODO: return an Error
         assert!(bql_locked());
         unsafe {
-            bindings::sysbus_realize(self.as_mut_ptr(), addr_of_mut!(bindings::error_fatal));
+            bindings::sysbus_realize(
+                self.upcast().as_mut_ptr(),
+                addr_of_mut!(bindings::error_fatal),
+            );
         }
     }
 }
diff --git a/rust/qemu-api/src/timer.rs b/rust/qemu-api/src/timer.rs
index a593538..f0b04ef 100644
--- a/rust/qemu-api/src/timer.rs
+++ b/rust/qemu-api/src/timer.rs
@@ -2,31 +2,51 @@
 // Author(s): Zhao Liu <zhai1.liu@intel.com>
 // SPDX-License-Identifier: GPL-2.0-or-later
 
-use std::os::raw::{c_int, c_void};
+use std::{
+    os::raw::{c_int, c_void},
+    pin::Pin,
+};
 
 use crate::{
     bindings::{self, qemu_clock_get_ns, timer_del, timer_init_full, timer_mod, QEMUClockType},
     callbacks::FnCall,
+    cell::Opaque,
 };
 
-pub type Timer = bindings::QEMUTimer;
-pub type TimerListGroup = bindings::QEMUTimerListGroup;
+/// A safe wrapper around [`bindings::QEMUTimer`].
+#[repr(transparent)]
+#[derive(Debug, qemu_api_macros::Wrapper)]
+pub struct Timer(Opaque<bindings::QEMUTimer>);
+
+unsafe impl Send for Timer {}
+unsafe impl Sync for Timer {}
+
+#[repr(transparent)]
+#[derive(qemu_api_macros::Wrapper)]
+pub struct TimerListGroup(Opaque<bindings::QEMUTimerListGroup>);
+
+unsafe impl Send for TimerListGroup {}
+unsafe impl Sync for TimerListGroup {}
 
 impl Timer {
     pub const MS: u32 = bindings::SCALE_MS;
     pub const US: u32 = bindings::SCALE_US;
     pub const NS: u32 = bindings::SCALE_NS;
 
-    pub fn new() -> Self {
-        Default::default()
-    }
-
-    const fn as_mut_ptr(&self) -> *mut Self {
-        self as *const Timer as *mut _
+    /// Create a `Timer` struct without initializing it.
+    ///
+    /// # Safety
+    ///
+    /// The timer must be initialized before it is armed with
+    /// [`modify`](Self::modify).
+    pub unsafe fn new() -> Self {
+        // SAFETY: requirements relayed to callers of Timer::new
+        Self(unsafe { Opaque::zeroed() })
     }
 
+    /// Create a new timer with the given attributes.
     pub fn init_full<'timer, 'opaque: 'timer, T, F>(
-        &'timer mut self,
+        self: Pin<&'timer mut Self>,
         timer_list_group: Option<&TimerListGroup>,
         clk_type: ClockType,
         scale: u32,
@@ -51,7 +71,7 @@ impl Timer {
         // SAFETY: the opaque outlives the timer
         unsafe {
             timer_init_full(
-                self,
+                self.as_mut_ptr(),
                 if let Some(g) = timer_list_group {
                     g as *const TimerListGroup as *mut _
                 } else {
@@ -67,14 +87,19 @@ impl Timer {
     }
 
     pub fn modify(&self, expire_time: u64) {
+        // SAFETY: the only way to obtain a Timer safely is via methods that
+        // take a Pin<&mut Self>, therefore the timer is pinned
         unsafe { timer_mod(self.as_mut_ptr(), expire_time as i64) }
     }
 
     pub fn delete(&self) {
+        // SAFETY: the only way to obtain a Timer safely is via methods that
+        // take a Pin<&mut Self>, therefore the timer is pinned
         unsafe { timer_del(self.as_mut_ptr()) }
     }
 }
 
+// FIXME: use something like PinnedDrop from the pinned_init crate
 impl Drop for Timer {
     fn drop(&mut self) {
         self.delete()
diff --git a/rust/qemu-api/src/vmstate.rs b/rust/qemu-api/src/vmstate.rs
index 24a4dc8..f0510ae 100644
--- a/rust/qemu-api/src/vmstate.rs
+++ b/rust/qemu-api/src/vmstate.rs
@@ -330,6 +330,7 @@ macro_rules! impl_vmstate_transparent {
 
 impl_vmstate_transparent!(std::cell::Cell<T> where T: VMState);
 impl_vmstate_transparent!(std::cell::UnsafeCell<T> where T: VMState);
+impl_vmstate_transparent!(std::pin::Pin<T> where T: VMState);
 impl_vmstate_transparent!(crate::cell::BqlCell<T> where T: VMState);
 impl_vmstate_transparent!(crate::cell::BqlRefCell<T> where T: VMState);
 
@@ -469,7 +470,7 @@ macro_rules! vmstate_clock {
                 $crate::assert_field_type!(
                     $struct_name,
                     $field_name,
-                    $crate::qom::Owned<$crate::bindings::Clock>
+                    $crate::qom::Owned<$crate::qdev::Clock>
                 );
                 $crate::offset_of!($struct_name, $field_name)
             },
diff --git a/rust/qemu-api/src/zeroable.rs b/rust/qemu-api/src/zeroable.rs
index 47b6977..a3415a2 100644
--- a/rust/qemu-api/src/zeroable.rs
+++ b/rust/qemu-api/src/zeroable.rs
@@ -106,3 +106,4 @@ impl_zeroable!(crate::bindings::MemoryRegionOps__bindgen_ty_1);
 impl_zeroable!(crate::bindings::MemoryRegionOps__bindgen_ty_2);
 impl_zeroable!(crate::bindings::MemoryRegionOps);
 impl_zeroable!(crate::bindings::MemTxAttrs);
+impl_zeroable!(crate::bindings::CharBackend);
diff --git a/rust/qemu-api/tests/tests.rs b/rust/qemu-api/tests/tests.rs
index e398578..269122e 100644
--- a/rust/qemu-api/tests/tests.rs
+++ b/rust/qemu-api/tests/tests.rs
@@ -2,13 +2,10 @@
 // Author(s): Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
 // SPDX-License-Identifier: GPL-2.0-or-later
 
-use std::{
-    ffi::{c_void, CStr},
-    ptr::{addr_of, addr_of_mut},
-};
+use std::{ffi::CStr, ptr::addr_of};
 
 use qemu_api::{
-    bindings::{module_call_init, module_init_type, object_new, object_unref, qdev_prop_bool},
+    bindings::{module_call_init, module_init_type, qdev_prop_bool},
     c_str,
     cell::{self, BqlCell},
     declare_properties, define_property,
@@ -182,30 +179,3 @@ fn test_cast() {
         assert_eq!(addr_of!(*sbd_ref), p_ptr.cast());
     }
 }
-
-#[test]
-#[allow(clippy::shadow_unrelated)]
-/// Test casts on mutable references.
-fn test_cast_mut() {
-    init_qom();
-    let p: *mut DummyState = unsafe { object_new(DummyState::TYPE_NAME.as_ptr()).cast() };
-
-    let p_ref: &mut DummyState = unsafe { &mut *p };
-    let obj_ref: &mut Object = p_ref.upcast_mut();
-    assert_eq!(addr_of_mut!(*obj_ref), p.cast());
-
-    let sbd_ref: Result<&mut SysBusDevice, &mut Object> = obj_ref.dynamic_cast_mut();
-    let obj_ref = sbd_ref.unwrap_err();
-
-    let dev_ref: Result<&mut DeviceState, &mut Object> = obj_ref.downcast_mut();
-    let dev_ref = dev_ref.unwrap();
-    assert_eq!(addr_of_mut!(*dev_ref), p.cast());
-
-    // SAFETY: the cast is wrong, but the value is only used for comparison
-    unsafe {
-        let sbd_ref: &mut SysBusDevice = obj_ref.unsafe_cast_mut();
-        assert_eq!(addr_of_mut!(*sbd_ref), p.cast());
-
-        object_unref(p_ref.as_object_mut_ptr().cast::<c_void>());
-    }
-}
diff --git a/scripts/meson-buildoptions.py b/scripts/meson-buildoptions.py
index 4814a8f..a3e2247 100644
--- a/scripts/meson-buildoptions.py
+++ b/scripts/meson-buildoptions.py
@@ -241,8 +241,14 @@ def print_parse(options):
     print("  esac")
     print("}")
 
-
-options = load_options(json.load(sys.stdin))
+json_data = sys.stdin.read()
+try:
+    options = load_options(json.loads(json_data))
+except:
+    print("Failure in scripts/meson-buildoptions.py parsing stdin as json",
+          file=sys.stderr)
+    print(json_data, file=sys.stderr)
+    sys.exit(1)
 print("# This file is generated by meson-buildoptions.py, do not edit!")
 print_help(options)
 print_parse(options)
diff --git a/scripts/meson-buildoptions.sh b/scripts/meson-buildoptions.sh
index 3e8e008..aca6e68 100644
--- a/scripts/meson-buildoptions.sh
+++ b/scripts/meson-buildoptions.sh
@@ -504,6 +504,8 @@ _meson_option_parse() {
     --disable-strict-rust-lints) printf "%s" -Dstrict_rust_lints=false ;;
     --enable-strip) printf "%s" -Dstrip=true ;;
     --disable-strip) printf "%s" -Dstrip=false ;;
+    --enable-split-debug) printf "%s" -Dsplit_debug=true ;;
+    --disable-split-debug) printf "%s" -Dsplit_debug=false ;;
     --sysconfdir=*) quote_sh "-Dsysconfdir=$2" ;;
     --enable-tcg) printf "%s" -Dtcg=enabled ;;
     --disable-tcg) printf "%s" -Dtcg=disabled ;;