This patch removes unused mepc arg from load_xyz() and store_xyz()
unpriviledge access functions.

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

Use the newly introduced "options" in "struct sbi_scratch" to
conditionally disable the boot prints.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>

Refactor the codes a little bit to put all prints during boot into
sbi_boot_prints().

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>

Introduce "options" in "struct sbi_scratch" and firmware can update
it based on optional compile time flags before calling sbi_init().

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>

The codes that currently program the interrupt enable register for
S-mode disagrees with what the comments say. Fix the comments.

While we are here, add one line comment to describe what is done
for M-mode too.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>

OpenSBI should show error trace only if any valid SBI function
does not perform as expected.

However, OpenSBI should show notify the caller with a negative
error if given SBI function ID is not valid.

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

Per PLIC spec, interrupt ID 0 is defined to mean "no interrupt".
We should bypass it.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>

At present plic_set_priority() ignores the 'source' and the priority
register to be programmed is constant. Fix it.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>

Scratch space setup needs to be done once for reboot for each
hart. _start_warm may be called several times if hart hotplug
is implemented.

Move scratch space setup to the beginning so that it is done
only once.

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

Currently, global page mappings are not flushed if start and size
arguments are zero.

Flush entire TLB if both size and start argument is passed as zero.

Fixes : 90cb4917

 (lib: Implement sfence.vma correctly)

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

There are some spaces or mixed usage of spaces and tabs in the macro
definition. Change to use tab consistently.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>

It's U-Boot, not U-boot.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>

Currently, OpenSBI doesn't distinguish between sfence.vma
and sfence.vm asid calls. Moreover, it ignores the page
ranges and just flush entire TLB everytime.

Fix the sfence implementation by keeping all the tlb flush
info in scratch area.

The relevant Linux kernel code was added by
https://patchwork.kernel.org/project/linux-riscv/list/?series=89695



However, this patch is backward compatible with older version kernel
that doesn't have the above patches as well.

Fixes #87
Signed-off-by: Atish Patra <atish.patra@wdc.com>

Create a sbi_ipi_data structure that holds unpacked IPI information. At
the same time remove ipi_type from the sbi_scratch struct and use a
fixed offset to access it.

This structure fits in behind the sbi_scratch structure.

This fixes https://github.com/riscv/opensbi/issues/81



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

A warm reset using reset button may put icache and registers
in non-coherent state.

Flush the icache and reset all registers for every hart.

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

All the non-boot harts run in a tight loop which may cause a heavy load
on the memory bus. This may delay the boot hart to complete the cold boot
process.

Introduce few nop that will ease up the traffic.

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

This reverts commit 05602e2b.

Introducing a fence causes warm reset issue to reappear. Revert it
for the time being.

platform should be a read-only variable, if it is placed in the data
segment, it may be exploited.

Signed-off-by: Xiang Wang <wxjstz@126.com>

A warm reset by pressing the reset button may not initialize all the
registers to zero. Do it for every hart during warm boot.

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>

As per the current SBI specification, sbi_getc should return
an int instead of char.

In case of FIFO is empty, return -1 as per the specification.

Reported-by: Sergi Granell <xerpi.g.12@gmail.com>
Suggested-by: Thadeu Lima de Souza Cascardo <cascardo@cascardo.eti.br>
Signed-off-by: Atish Patra <atish.patra@wdc.com>

Multi-core communication via memory requires the addition of a barrier
instructions to ensure cache coherency.

Signed-off-by: Xiang Wang <wxjstz@126.com>

Writable code section can cause some security problems, so move _boot_hart_done
to the data section

Signed-off-by: Xiang Wang <wxjstz@126.com>

Signed-off-by: Xiang Wang <wxjstz@126.com>

This patch updates OpenSBI version to 0.3 as part of
release preparation.

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

Ensure the platform variable PLATFORM_RISCV_XLEN is set before we parse
the platform files.

This fixes the 32-bit openSBI FW_JUMP_ADDR.

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

This patch increases OpenSBI version to 0.2.

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

This patch adds scripts/create-binary-archive.sh which helps
us create a common tarball containing headers, static library
and firmware ELFs for all platforms.

This script can be used for release purpose OR for compile
testing all platforms.

Example usage commands are as follows:

1) Binary release archive for 32bit systems
./scripts/create-binary-archive.sh -s "bin" -x 32 -d

2) Binary release archive for 64bit systems
./scripts/create-binary-archive.sh -s "bin" -d

3) Compile test for 32bit systems
./scripts/create-binary-archive.sh -x 32 -t

4) Compile test for 64bit systems
./scripts/create-binary-archive.sh -t

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

The compile_ld() is actually used to create ELF files so
the name is misleading hence this patch renames it to
compile_elf(). We also rename LDFLAGS to ELFFLAGS because
these will be used for ELF creation only.

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

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

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>