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lib: sbi: Detect Smstateen CSRs at boot-time

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Extend HART feature detection to discover Smstateen CSRs at boot-time
and configure mstateen envcfg bit depending on availability of
menvcfg CSR.

Signed-off-by: Mayuresh Chitale <mchitale@ventanamicro.com>
Reviewed-by: Xiang W <wxjstz@126.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Mayuresh Chitale
2022-04-11 08:34:10 +05:30
committed by Anup Patel
parent 499601a4ff
commit d44568a0f2
2 changed files with 28 additions and 1 deletions
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4
include/sbi/sbi_hart.h
View File

@@ -28,9 +28,11 @@ enum sbi_hart_features {
SBI_HART_HAS_AIA = (1 << 5),
/** HART has menvcfg CSR */
SBI_HART_HAS_MENVCFG = (1 << 6),
/** HART has mstateen CSR **/
SBI_HART_HAS_SMSTATEEN = (1 << 7),
/** Last index of Hart features*/
SBI_HART_HAS_LAST_FEATURE = SBI_HART_HAS_MENVCFG,
SBI_HART_HAS_LAST_FEATURE = SBI_HART_HAS_SMSTATEEN,
};
struct sbi_scratch;

25
lib/sbi/sbi_hart.c
View File

@@ -43,6 +43,7 @@ static void mstatus_init(struct sbi_scratch *scratch)
int cidx;
unsigned int num_mhpm = sbi_hart_mhpm_count(scratch);
uint64_t mhpmevent_init_val = 0;
uint64_t mstateen_val;
/* Enable FPU */
if (misa_extension('D') || misa_extension('F'))
@@ -87,6 +88,22 @@ static void mstatus_init(struct sbi_scratch *scratch)
#endif
}
if (sbi_hart_has_feature(scratch, SBI_HART_HAS_SMSTATEEN)) {
mstateen_val = csr_read(CSR_MSTATEEN0);
#if __riscv_xlen == 32
mstateen_val |= ((uint64_t)csr_read(CSR_MSTATEEN0H)) << 32;
#endif
mstateen_val |= SMSTATEEN_STATEN;
if (sbi_hart_has_feature(scratch, SBI_HART_HAS_MENVCFG))
mstateen_val |= SMSTATEEN0_HSENVCFG;
else
mstateen_val &= ~SMSTATEEN0_HSENVCFG;
csr_write(CSR_MSTATEEN0, mstateen_val);
#if __riscv_xlen == 32
csr_write(CSR_MSTATEEN0H, mstateen_val >> 32);
#endif
}
if (sbi_hart_has_feature(scratch, SBI_HART_HAS_MENVCFG)) {
menvcfg_val = csr_read(CSR_MENVCFG);
@@ -348,6 +365,9 @@ static inline char *sbi_hart_feature_id2string(unsigned long feature)
case SBI_HART_HAS_MENVCFG:
fstr = "menvcfg";
break;
case SBI_HART_HAS_SMSTATEEN:
fstr = "smstateen";
break;
default:
break;
}
@@ -584,6 +604,11 @@ __aia_skip:
if (!trap.cause)
hfeatures->features |= SBI_HART_HAS_MENVCFG;
/* Detect if hart supports mstateen CSRs */
val = csr_read_allowed(CSR_MSTATEEN0, (unsigned long)&trap);
if (!trap.cause)
hfeatures->features |= SBI_HART_HAS_SMSTATEEN;
return;
}