This patch adds documentation for qemu/virt and
qemu/sifive_u platform supports.

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

This patch does minor typo fixes in top-level README.md.

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

Currently, we fail with error SBI_ENOTSUPP when we are not able
to handle illegal instruction trap. Instead, we should just
redirect illegal instruction trap to S-mode when not handled.

This redirection of illegal instruction trap will help lazy
save/restore of floating point registers to work correctly in
Linux kernel.

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

The Kendryte K210 platform support was contributed by Damien
hence fix author name.

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

We rename sifive/hifive_u540 platform support to sifive/fu540
to match the SoC name which is SiFive FU540 (as-per user manual).

In fact, we can expect no (or very minimal) board specific
quirks in sifive/fu540 platform support. These board specific
quirks can be turned on/off in-future using PLATFORM_<xyz>
make command-line option.

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

The mtval CSR is very useful information when debugging hence
print it upon trap error in sbi_trap_error().

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

We rename target_hart parameter of PMP platform callbacks to
hartid for clarity because the parameter represents current
hartid.

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

Instead of having separate timer_init() hooks for cold and
warm boot, this patch updates struct sbi_platform to have just
one timer_init() hook. The type of boot (cold or warm) is now
a boolean flag parameter for the updated timer_init() hook.

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

Instead of having separate ipi_init() hooks for cold and warm boot,
this patch updates struct sbi_platform to have just one ipi_init()
hook. The type of boot (cold or warm) is now a boolean flag parameter
for the updated ipi_init() hook.

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

Instead of having separate irqchip_init() hooks for cold and
warm boot, this patch updates struct sbi_platform to have just
one irqchip_init() hook. The type of boot (cold or warm) is now
a boolean flag parameter for the updated irqchip_init() hook.

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

Instead of having separate early_init() and final_init() hooks
for cold and warm boot, this patch updates struct sbi_platform
to have just one early_init() and one final_init() hook. The
type of boot (cold or warm) is now a boolean flag parameter for
the updated early_init() and final_init() hooks.

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

The fw_common.S is the base firmware extendend by fw_jump and
fw_payload. This patch renames fw_common.S to fw_base.S to
have more clear/intutive name for base firmware.

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

This improves 'clean' and 'distclean' makefile target as follows:
1. Remove only .o, .a, .elf, and .bin files for 'clean'
2. Remove .dep in-addition to what 'clean' does for 'distclean'
3. Remove default build and install directory for 'distclean'

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

We now have payloads sub-directory under firmware directory which
means payload BINs and ELFs should be installed under firmware/payloads.

This patch improves inst_file_list() to handle payloads sub-directory
under firmware installation directory.

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

We use recently added separate dummy payload for FW_PAYLOAD
when FW_PAYLOAD_PATH is not specified.

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

Currently, the default payload for FW_PAYLOAD is embedded
fw_payload.S itself. This means people have to hack fw_payload.S
if they want to have some temporary S-mode test code.

This patch adds a separate dummy payload for FW_PAYLOAD which
can be easily hacked for some S-mode testing.

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

This patch moves all ECALL defines to sbi_ecall_interface.h so
that it can be shared with firmware payloads.

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

We generally don't get misaligned load/store traps from Linux/U-Boot
compiled using GCC 8.2 or higher but this is not true with older
GCC toolchains. To tackle this we add misaligned load/store trap
handling adopted from BBL sources but much more simpler.
(Note: BBL sources can be found at https://github.com/riscv/riscv-pk.git

)

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

This patch moves all instruction encoding macros to
riscv_encoding.h.

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

The name CROSS_COMPILE is an industry standard used across
open-source project to specify cross-compiler prefix.

In fact, distro build systems such as buildroot and yocto
assume CROSS_COMPILE to be supported by projects added
as packages to these build systems.

This patch rename back CROSS_COMPILE_PREFIX to CROSS_COMPILE.

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

Some rewrite with a more formal style.

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

Clean was doing nothing. Fix it to remove all compiled files, leaving
only dependency files.

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

Make it clear what this environment variable defines and update
the README.md file to explain that.

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

Remove PLAT_<xyz> defines from platform and firmwares

The platform specific options will be PLATFORM_<xyz> and not
PLAT_<xyz> hence this patch fixes typo in top-level README.md.

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

The PLAT_HART_COUNT and PLAT_HART_STACK_SIZE are only used
by platform code so no need of exposing these to everyone
by adding it to platform-cppflags-y.

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

The hart_count and hart_stack_size information is already available
in "struct sbi_platform" so we use that instead of depending on
PLAT_HART_COUNT and PLAT_HART_STACK_SIZE.

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

We don't need a separate stack section for per-HART stack
instead we create per-HART stack at the end of firmware
(i.e. after _fw_end symbol).

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

The PLAT_NAME is used only in platform.c for all platforms hence
remove it.

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

Unleashed working 12 21

M mode is not expected to recieve any interrupts.
S mode interrupts shouldn't be enabled in M mode.

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

As of now, uboot doesn't have support for SMP.
Moreover, unleashed board has a E51 hart which
doesn't not support S mode.

We should only boot only 1 non-zero hart.

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

Pass S-Mode and M-mode context id separately to common warm init.

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

Unleashed doesn't have S mode for hart 0.
PLIC register base calculation is current wrong because of that.

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

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

Conditionnally delegate page fault exceptions from M mode to S mode
based on the platform features.

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

The math.h is not required anymore and it also gives
compile error for certain toolchains hence thsi patch
removes math.h include from kendryte/k210/sysctl.c.

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

The mideleg and medeleg are already programmed in delegate_traps()
so no need to set it here.

Any CSR setup in our reference firmware becomes a requirement
for bootloader linking to libsbi.a so we should have minimum
possible CSR setup in our reference firmware.

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

This patch reverts "Fix FDT relocation" because it breaks
fw_jump firmware.

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

The sbi_hart_switch_mode() will be used by CPU hotplug. This means
if we have prints in sbi_hart_switch_mode() then these prints will
mix with Linux prints.

Being a runtime firmware, we should be verbose only at coldboot
time and error situations.

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