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lib: sbi: implement SBI FWFT extension 

The SBI FWFT extension defines a set of function that can be called
to control the configuration of some platform features (misaligned
trap delegation, etc). This patch implements sbi_fwft_set() and
sbi_fwft_get() as defined in the specification [1].

Link: https://lists.riscv.org/g/tech-prs/message/924 [1]
Signed-off-by: Clément Léger <cleger@rivosinc.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Clément Léger 2024-06-19 11:42:42 +02:00 committed by Anup Patel
parent e9ee9678ba
commit ecef14d573
3 changed files with 56 additions and 0 deletions
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4
lib/sbi/Kconfig
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@ -38,6 +38,10 @@ config SBI_ECALL_CPPC
bool "CPPC extension" bool "CPPC extension"
default y default y
config SBI_ECALL_FWFT
bool "Firmware Feature extension"
default y
config SBI_ECALL_LEGACY config SBI_ECALL_LEGACY
bool "SBI v0.1 legacy extensions" bool "SBI v0.1 legacy extensions"
default y default y

3
lib/sbi/objects.mk
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@ -46,6 +46,9 @@ libsbi-objs-$(CONFIG_SBI_ECALL_DBCN) += sbi_ecall_dbcn.o
carray-sbi_ecall_exts-$(CONFIG_SBI_ECALL_CPPC) += ecall_cppc carray-sbi_ecall_exts-$(CONFIG_SBI_ECALL_CPPC) += ecall_cppc
libsbi-objs-$(CONFIG_SBI_ECALL_CPPC) += sbi_ecall_cppc.o libsbi-objs-$(CONFIG_SBI_ECALL_CPPC) += sbi_ecall_cppc.o
carray-sbi_ecall_exts-$(CONFIG_SBI_ECALL_FWFT) += ecall_fwft
libsbi-objs-$(CONFIG_SBI_ECALL_FWFT) += sbi_ecall_fwft.o
carray-sbi_ecall_exts-$(CONFIG_SBI_ECALL_LEGACY) += ecall_legacy carray-sbi_ecall_exts-$(CONFIG_SBI_ECALL_LEGACY) += ecall_legacy
libsbi-objs-$(CONFIG_SBI_ECALL_LEGACY) += sbi_ecall_legacy.o libsbi-objs-$(CONFIG_SBI_ECALL_LEGACY) += sbi_ecall_legacy.o

49
lib/sbi/sbi_ecall_fwft.c Normal file
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@ -0,0 +1,49 @@
/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2024 Rivos Inc.
*
* Authors:
* Clément Léger <cleger@rivosinc.com>
*/
#include <sbi/sbi_ecall.h>
#include <sbi/sbi_ecall_interface.h>
#include <sbi/sbi_error.h>
#include <sbi/sbi_fwft.h>
#include <sbi/sbi_trap.h>
static int sbi_ecall_fwft_handler(unsigned long extid, unsigned long funcid,
struct sbi_trap_regs *regs,
struct sbi_ecall_return *out)
{
int ret = 0;
switch (funcid) {
case SBI_EXT_FWFT_SET:
ret = sbi_fwft_set(regs->a0, regs->a1, regs->a2);
break;
case SBI_EXT_FWFT_GET:
ret = sbi_fwft_get(regs->a0, &out->value);
break;
default:
ret = SBI_ENOTSUPP;
break;
}
return ret;
}
struct sbi_ecall_extension ecall_fwft;
static int sbi_ecall_fwft_register_extensions(void)
{
return sbi_ecall_register_extension(&ecall_fwft);
}
struct sbi_ecall_extension ecall_fwft = {
.extid_start = SBI_EXT_FWFT,
.extid_end = SBI_EXT_FWFT,
.register_extensions = sbi_ecall_fwft_register_extensions,
.handle = sbi_ecall_fwft_handler,
};