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lib: sbi: Detect AIA CSRs at boot-time
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>
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@@ -24,9 +24,11 @@ enum sbi_hart_features {
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SBI_HART_HAS_SSCOFPMF = (1 << 3),
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SBI_HART_HAS_SSCOFPMF = (1 << 3),
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/** HART has timer csr implementation in hardware */
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/** HART has timer csr implementation in hardware */
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SBI_HART_HAS_TIME = (1 << 4),
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SBI_HART_HAS_TIME = (1 << 4),
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/** HART has AIA local interrupt CSRs */
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SBI_HART_HAS_AIA = (1 << 5),
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/** Last index of Hart features*/
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/** Last index of Hart features*/
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SBI_HART_HAS_LAST_FEATURE = SBI_HART_HAS_TIME,
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SBI_HART_HAS_LAST_FEATURE = SBI_HART_HAS_AIA,
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};
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};
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struct sbi_scratch;
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struct sbi_scratch;
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@@ -301,6 +301,9 @@ static inline char *sbi_hart_feature_id2string(unsigned long feature)
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case SBI_HART_HAS_TIME:
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case SBI_HART_HAS_TIME:
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fstr = "time";
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fstr = "time";
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break;
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break;
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case SBI_HART_HAS_AIA:
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fstr = "aia";
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break;
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default:
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default:
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break;
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break;
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}
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}
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@@ -524,6 +527,14 @@ __mhpm_skip:
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csr_read_allowed(CSR_TIME, (unsigned long)&trap);
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csr_read_allowed(CSR_TIME, (unsigned long)&trap);
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if (!trap.cause)
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if (!trap.cause)
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hfeatures->features |= SBI_HART_HAS_TIME;
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hfeatures->features |= SBI_HART_HAS_TIME;
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/* Detect if hart has AIA local interrupt CSRs */
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csr_read_allowed(CSR_MTOPI, (unsigned long)&trap);
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if (trap.cause)
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goto __aia_skip;
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hfeatures->features |= SBI_HART_HAS_AIA;
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__aia_skip:
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return;
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}
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}
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int sbi_hart_reinit(struct sbi_scratch *scratch)
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int sbi_hart_reinit(struct sbi_scratch *scratch)
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