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lib: sbi: implement firmware feature SBI_FWFT_DOUBLE_TRAP

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Add support for double trap firmware feature.

Link: https://lists.riscv.org/g/tech-prs/message/985 [1]
Signed-off-by: Clément Léger <cleger@rivosinc.com>
Reviewed-by: Samuel Holland <samuel.holland@sifive.com>
This commit is contained in:
Clément Léger
2024-10-18 10:40:07 +02:00
committed by Anup Patel
parent b2f77f5fa8
commit 3bc86854ab
2 changed files with 27 additions and 1 deletions
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3
include/sbi/riscv_encoding.h
View File

@@ -217,7 +217,8 @@
#define ENVCFG_ADUE_SHIFT 61
#define ENVCFG_ADUE (_ULL(1) << ENVCFG_ADUE_SHIFT)
#define ENVCFG_CDE (_ULL(1) << 60)
#define ENVCFG_DTE (_ULL(1) << 59)
#define ENVCFG_DTE_SHIFT 59
#define ENVCFG_DTE (_ULL(1) << ENVCFG_DTE_SHIFT)
#define ENVCFG_PMM (_ULL(0x3) << 32)
#define ENVCFG_PMM_PMLEN_0 (_ULL(0x0) << 32)
#define ENVCFG_PMM_PMLEN_7 (_ULL(0x2) << 32)

25
lib/sbi/sbi_fwft.c
View File

@@ -137,6 +137,25 @@ static int fwft_get_misaligned_delegation(struct fwft_config *conf,
return SBI_OK;
}
static int fwft_double_trap_supported(struct fwft_config *conf)
{
if (!sbi_hart_has_extension(sbi_scratch_thishart_ptr(),
SBI_HART_EXT_SSDBLTRP))
return SBI_ENOTSUPP;
return SBI_OK;
}
static int fwft_set_double_trap(struct fwft_config *conf, unsigned long value)
{
return fwft_menvcfg_set_bit(value, ENVCFG_DTE_SHIFT);
}
static int fwft_get_double_trap(struct fwft_config *conf, unsigned long *value)
{
return fwft_menvcfg_read_bit(value, ENVCFG_DTE_SHIFT);
}
static int fwft_adue_supported(struct fwft_config *conf)
{
if (!sbi_hart_has_extension(sbi_scratch_thishart_ptr(),
@@ -349,6 +368,12 @@ static const struct fwft_feature features[] =
.set = fwft_enable_sstack,
.get = fwft_get_sstack,
},
{
.id = SBI_FWFT_DOUBLE_TRAP,
.supported = fwft_double_trap_supported,
.set = fwft_set_double_trap,
.get = fwft_get_double_trap,
},
{
.id = SBI_FWFT_PTE_AD_HW_UPDATING,
.supported = fwft_adue_supported,