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lib: sbi: Detect AIA CSRs at boot-time

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We extend HART feature detection to discover AIA CSRs at boot-time.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
This commit is contained in:
Anup Patel
2021-04-06 13:06:47 +05:30
committed by Anup Patel
parent 01250d0044
commit 8f96070067
2 changed files with 14 additions and 1 deletions
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4
include/sbi/sbi_hart.h
View File

@@ -24,9 +24,11 @@ enum sbi_hart_features {
SBI_HART_HAS_SSCOFPMF = (1 << 3),
/** HART has timer csr implementation in hardware */
SBI_HART_HAS_TIME = (1 << 4),
/** HART has AIA local interrupt CSRs */
SBI_HART_HAS_AIA = (1 << 5),
/** Last index of Hart features*/
SBI_HART_HAS_LAST_FEATURE = SBI_HART_HAS_TIME,
SBI_HART_HAS_LAST_FEATURE = SBI_HART_HAS_AIA,
};
struct sbi_scratch;

11
lib/sbi/sbi_hart.c
View File

@@ -301,6 +301,9 @@ static inline char *sbi_hart_feature_id2string(unsigned long feature)
case SBI_HART_HAS_TIME:
fstr = "time";
break;
case SBI_HART_HAS_AIA:
fstr = "aia";
break;
default:
break;
}
@@ -524,6 +527,14 @@ __mhpm_skip:
csr_read_allowed(CSR_TIME, (unsigned long)&trap);
if (!trap.cause)
hfeatures->features |= SBI_HART_HAS_TIME;
/* Detect if hart has AIA local interrupt CSRs */
csr_read_allowed(CSR_MTOPI, (unsigned long)&trap);
if (trap.cause)
goto __aia_skip;
hfeatures->features |= SBI_HART_HAS_AIA;
__aia_skip:
return;
}
int sbi_hart_reinit(struct sbi_scratch *scratch)