This patch extends our low-level trap handler in fw_base.S for
handling M-mode to M-mode traps without overwritting stack.

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

The unsigned long is always machine word size. This means it is
4 bytes on 32bit system and 8 bytes on 64bit system.

This patch adds PRILX define for sbi_printf() which will help us
print unsigned long without worrying whether it is 32bit or 64bit
system.

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

There was a space instead of '_' in the function `platform_final_init`.

Following updates to fu540 platform guide.

1. Update a section about flashing the firmware binary
to sdcard with correct partition identifier.
2. Refer the individual payload section.
3. Update uboot booting section.

Signed-off-by: Atish Patra <atish.patra@wdc.com>

Signed-off-by: Atish Patra <atish.patra@wdc.com>

Signed-off-by: Atish Patra <atish.patra@wdc.com>

Signed-off-by: Atish Patra <atish.patra@wdc.com>

This patch replaces use of awk with sed in top-level makefile
to parse OpenSBI version from include/sbi/sbi_version.h.

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

We get following error evaluating OPENSBI_CC_XLEN on
Ubuntu-18.04:
/bin/sh: 1: Bad substitution

This patch fixes above error by using "awk" in string
assigned to OPENSBI_CC_XLEN and it also moves "Setup
compilation commands" before OPENSBI_CC_XLEN.

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

The mask shift in for-loop of sbi_ipi_send_many() is
broken with commit 918c1354


("lib: Improve delivery of SBI_IPI_EVENT_HALT")

This patch fix it.

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

When sbi_ipi_send_many gets called with the current hartid
included on pmask (or when pmask is NULL), and we send
a HALT event, since the for loop works sequentially over
all hartids on the mask, we may send a HALT event to the
current hart before the loop finishes. So we will halt
the current hart before it can deliver a HALT IPI to the
rest and some harts will remain active.

Make sure we send an IPI to the current hart after we've
finished with everybody else.

Signed-off-by: Nick Kossifidis <mick@ics.forth.gr>

In order for QEMU to be compatible with Spike, it implements
a simple protocol used for reporting back the simulation's
status, through the memory-mapped "test finisher" device. We
use that protocol to make QEMU exit on system shutdown.

Signed-off-by: Nick Kossifidis <mick@ics.forth.gr>

In case the platform specific method for shutting down
the system fails (or is not implemented), at least make
sure that all harts hang instead of just the current hart.

Signed-off-by: Nick Kossifidis <mick@ics.forth.gr>

Previously OPENSBI_CC_XLEN was not being correctly assigned either 32 or
64. It also was not assigned before config.mk was parsed. Ensure that it
will always be assigned.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

Add 'make run' command for platform specific run

Makes for easy and quick build-run one-stop command.

For now only added for qemu targets. It can be added for
any platform having simulator/emulator (such as QEMU).

Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Anup Patel <anup.patel@wdc.com>

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

Add a device tree for th HiFive Unleashed that includes the Microsemi
PCIe root complex.

Once we have support for u-boot and in tree Linux kernel device trees
this device tree should be removed.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

We expect the payloads to be 4 bit alligned as we later AND them
with ~0xf. As most of the addresses are manually specified we don't
really need this, but better to be over cautious.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

On Makefile merge_objs calls ld without providing any hints
on the target so on a multilib toolchain for example it will
always pick the default one (elf64-littleriscv) which will
then result a failure when compiling on RV32 since the objects
will be 32bits and the target will be 64bits. The same happens
on compile_ld that calls gcc without CFLAGS so it doesn't
get mabi/march.

With this patch OpenSBI compiles on RV32 (PLATFORM_RISCV_XLEN=32),
I tested fw_jump.elf on qemu (but it doesn't boot the kernel yet
-bbl also doesn't boot the kernel so it may be something else).

Signed-off-by: Nick Kossifidis <mickflemm@gmail.com>

Some older toolchains may not have all the csr's defined. Update all
the csr functions to use the CSR_ #define values instead of the
toolchain defined values.

Signed-off-by: Atish Patra <atish.patra@wdc.com>

Some older toolchains may not have all the csr's defined. Update all
the csr functions to use the CSR_ #define values instead of the
toolchain defined values.

Suggested-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Atish Patra <atish.patra@wdc.com>

Some older toolchains may not have all the csr's defined. Update all
the csr functions to use the CSR_ #define values instead of the
toolchain defined values.

Suggested-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Atish Patra <atish.patra@wdc.com>

Usage non-breaking hyphen breaks make docs as doxygen doesn't know
how to handle this.

Signed-off-by: Atish Patra <atish.patra@wdc.com>

This patch introduces following optional PLATFORM options:
PLATFORM_RISCV_XLEN -> RISC-V register width
PLATFORM_RISCV_ABI -> RISC-V GCC ABI
PLATFORM_RISCV_ISA -> RISC-V GCC ISA string
PLATFORM_RISCV_CODE_MODEL -> RISC-V GCC Code Model

If the above options are not provided by platform config.mk
or by command-line parameters then:
1. PLATFORM_RISCV_XLEN will be determined using toolchain
capability
2. PLATFORM_RISCV_ABI, PLATFORM_RISCV_ISA, and
PLATFORM_RISCV_CODE_MODEL is set to value best suited for
generic libsbi.a

As a result of these optional PLATFORM options, the
platform-cflags-y and platform-asflags-y is further
simplified for platform config.mk.

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

The current 4MB aligned FW_JUMP_ADDR and FW_PAYLOAD_OFFSET breaks
U-Boot on QEMU virt and sifive_u machines.

Instead of using 4MB aligned for both 32bit and 64bit systems, we
use different values based compiler XLEN. Another advantage of this
approach will be that our fw_payload.bin will smaller for 64bit
systems.

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

Both FW_JUMP_ADDR and FW_PAYLOAD_OFFSET, should be:
1. 4MB aligned for 32bit system
2. 2MB aligned for 64bit system

Explicitly specify the above details in config.mk comments
for template platform.

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

Clarify the libraries descriptions.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>

Clarify platform support description.
Also fix some Typos, grammar and document style.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>

Clarify OpenSBI components explanation.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>

This fixes errors like this:
  undefined reference to `__umoddi3'
when buildilng for 32-bit systems

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

csr_val is a tartget length based variable, so on 32-bit devices it's
only 32-bits. To avoid clearing the entire register perform both steps
in a single line.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

In order to support 32-bit guests move the start address to a 4MB
allignment. As 64-bit kernels have a requirement on being 2MB alligned
let's just make this the default for both 32 and 64 bit kernels.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

In order to support 32-bit guests move the start address to a 4MB
allignment. As 64-bit kernels have a requirement on being 2MB alligned
let's just make this the default for both 32 and 64 bit kernels.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>