We should zero-out memory allocated from extra scratch space using
sbi_scratch_alloc_offset() API hence this patch. This will not
impact performance because we mostly allocate from extra scratch
space only at cold boot time.

Signed-off-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Atish Patra <atish.patra@wdc.com>

We improve sbi_system_reboot() an sbi_system_shutdown() by:

1. Calling halt IPI to all harts (except current HART) before
   calling platform reboot/shutdown hook.
2. Calling sbi_exit() instead of sbi_hang() in-case platform
   reboot/shutdown hook failed.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>

Instead of doing sbi_hang() we should do sbi_exit() upon
halt IPI.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>

Currently, sbi_hart_wait_for_coldboot() leaves MIE.MSIP bit
set when it returns which is not correct because MIE.MSIP
should be left enabled only by sbi_ipi_init().

This patch does save/restore of MIE CSR to ensure that MIE
CSR is in original state after sbi_hart_wait_for_coldboot()
returns.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>

We add an optional platform irqchip exit hook for exit path handling
in sbi_exit() implementation.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>

We add sbi_ipi_exit() API for exit path handling in sbi_exit()
implementation.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>

We add sbi_timer_exit() API for OpenSBI exit path handling in
sbi_exit() implementation.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>

This patch adds system-level early_exit and final_exit APIs
with corresponding platform hooks. These new APIs will be
primarily used by sbi_exit() in OpenSBI exit path.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>

This patch adds initial implementation of sbi_exit() API which
can be used to perform OpenSBI exit sequence for current HART.

The sbi_exit() implementation will be further extended by
subsequent patches.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>

We remove unnecessary checks related to hart hotplug and disabled
hart in coldboot and warmboot init path.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>

This commit provides basic support for the Thead/C910 platform.

Signed-off-by: Liu Yibin <yibin_liu@c-sky.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>

It is possible to have a CLINT implementation which supports
only 32bit MMIO accesses on RV64 system so this patch extends
our CLINT driver such that platform code can specify whether
CLINT supports 64bit MMIO access.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish <Patra&lt;atish.patra@wdc.com>
Reviewed-by: Zong Li <zong.li@sifive.com>

This patch updates FW_JUMP and FW_PAYLOAD documentation for the
case where FW_xyz_FDT_ADDR is not specified.

Signed-off-by: Liu Yibin <yibin_liu@c-sky.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>

The state of a0, a1, and a2 registers in fw_prev_arg1() and
fw_next_arg1() is same as passed by previous booting stage
so we add this info in comments for both these functions.

Signed-off-by: Anup Patel <anup.patel@wdc.com>

Function fw_next_arg1 in firmware/fw_jump.S:59 and
firmware/fw_payload.S:63 should return real dtb
address(if specified in a1) in a0, in case we don't
want to specify FW_xyz_FDT_ADDR when compiling.

Signed-off-by: Liu Yibin <yibin_liu@c-sky.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>

This patch adds RFENCE extension support in OpenSBI.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>

The hypervisor specification support hfence calls which can be used
issue tlb flush requests at both level of address translation. Currently,
these requests are issued only via SBI which are defined in v0.2.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>

Currently, the toolchains do not have support for hfence instruction.
Hence, the instruction are hardcode until we have toolchain support.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>

This patch adds new IPI extension which replaces ipi related
v0.1 extensions. This also adds a new API for ipi sending as trap
handling is not necessary in v0.2 SBI IPI related extensions.

It also modifies the IPI sending code which now accepts hart mask as a value
instead of S-mode virtual address. Thus, the caller should set it to exact hart
mask value everytime.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>

This patch adds support for TIME extension which replaces v0.1
timer extension.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>

We just need to distinguish only between FENCE and non FENCE related
IPIs as all of the fence related requests are handled via fifo now.

Remove the unnecessary IPI types related to individual fence types.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>

Take this opportunity to move the enums to macros as enums make
sbi_ecall_interface.h unusable in assembly files.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>

We should use MTINST CSR in misaligned load/store emulation whenever
possible to avoid unpriv read in getting trapped instruction. This will
improve preformance on HW having proper implementation of MTINST CSR.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

The hypervisor v0.5 spec introduces two new CSRs for both M-mode
and HS-mode which need to be considered when redirecting traps
hence this patch.

Signed-off-by: Anup Patel <anup.patel@wdc.com>

We should treat load guest page fault in sbi_get_insn() as
fetch guest patch fault.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

We have two new trap CSRs namely mtval2 and mtinst when
RISC-V hypervisor extension is available hence we extend
struct sbi_trap_info accordingly.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

As-per RISC-V hypervisor v0.5 spec, we have new guest page faults
which need to be delegated to HS-mode.

Also, we can have bits in in MIDELEG and MEDELEG hardwired to 1
which means we need to fix the sainty check on these CSRs at the
end of delegate_traps() function.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

With RISC-V H-extension v0.5 draft, we have special support for guest
external interrupts so this patch adds related defines which were
missed-out previously.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

GCC-9 will throw a warning when using the %s format specifier with a
possible NULL parameter and since -Werror is used, the compilation breaks
for GCC-9.

In function 'sbi_boot_prints',
    inlined from 'init_coldboot' at <redacted>/opensbi/lib/sbi/sbi_init.c:107:3,
    inlined from 'sbi_init' at <redacted>/opensbi/lib/sbi/sbi_init.c:189:3:
<redacted>/opensbi/lib/sbi/sbi_init.c:56:2: error: '%s' directive argument is null [-Werror=format-overflow=]
   56 |  sbi_printf("Platform Name          : %s\n", sbi_platform_name(plat));
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors

This is one way to fix this, currently there is nothing in the tree
checking for `sbi_platfrom_name() == NULL` so we can just return "Unknown"
instead of NULL on failure.

Signed-off-by: Martin Pietryka <martin@pietryka.at>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
Tested-by: David Abdurachmanov <david.abdurachmanov@sifive.com>

Add assertions for misa_extension to prevent incoming illegal
characters.

Signed-off-by: Xiang Wang <merle@hardenedlinux.org>
Reviewed-by: Anup Patel <anup.patel@wdc.com>

The break statement is missing in base extension function handling.

Fix the typo.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Xiang Wang <merle@hardenedlinux.org>
Reviewed-by: Anup Patel <anup.patel@wdc.com>

On some platforms, misa may not be implemented. On such a platform,
reading misa will get 0. At this time, platform is required to
implement a non-standard function to detect the CPU's capabilities.
Therefore, this modification add interfaces for non-standard function.

The MXL field of misa is always at the highest two bits, whether it
is a 32-bit 64-bit or a 128-bit machine. Therefore, this modification
fixes the use of a fixed offset to detect the machine length.

Signed-off-by: Xiang Wang <merle@hardenedlinux.org>
Signed-off-by: Anup Patel <anup.patel@wdc.com>

The out_tcause and out_tval parameters are not sufficient for most
sbi_ecall functions because this will grow in-future when we support
RISC-V hypervisor v0.5 draft. We replace these parameters with out_trap
which is a pointer to struct sbi_trap_info.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>

The unpriv APIs can be useful to external firmware and out-of-tree
platform support code.

This patch adds "sbi_" prefix to unpriv load/store APIs and rename
struct riscv_unpriv to struct sbi_trap_info everywhere. We also
place struct sbi_trap_info in sbi/sbi_trap.h so that we can use
it for sbi_trap_redirect() as well.

Overall, this patch will make naming of unpriv APIs consistent
with other OpenSBI APIs.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>

We don't need to set VSSTATUS.MXR bit in get_insn() for
unpriv instruction read because MSTATUS.MXR bit applies
to both "Stage1" and "Stage2" page tables.

This also allows us to remove the "virt" parameter of
get_insn() function.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>

We simplify struct unpriv_trap by removing ilen member. This
can be achieved by ensuring that at all unpriv load/store
instructions are 4 bytes long using GCC assembler option.

Additionally, this also reduces few instructions from unpriv
load/store functions.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>

Building the date and time into the binary means the OpenSBI isn't
reproducible. We don't really need the time so let's remove it.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>

It has been reported that link address range of previous booting stage
(such as U-Boot SPL) can overlap the link address rage of FW_DYNAMIC.

This means self-relocation in FW_DYNAMIC can potentially corrupt
previous booting stage if any of the secondary HART enter FW_DYNAMIC
before primary HART.

To tackle this, we add preferred boot HART field (i.e boot_hart) in
struct fw_dyanmic_info. We use this field to force secondary HARTs
into relocation wait loop till preferred/primary boot HART enters
FW_DYNAMIC completes self-relocation. If preferred boot HART is not
available then we fall back to relocation lottery approach.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>

The riscv_encoding.h is shared with assembly sources so we use
_UL() and _ULL() for register fields related defines.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>

This patch sync-up encoding header with the latest privilege
specifications draft v1.12 and hypervisor specifications draft v0.5.

The MSTATUS.MTL and HSTATUS.STL bits are not present anymore and
will be removed by another patch series for hypervisor v0.5-draft.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>