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[TODO] smmtt: Config msdcfg #6

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Merged
cp0613 merged 1 commit into from
May 7, 2026
Merged

[TODO] smmtt: Config msdcfg #6

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9 changes: 9 additions & 0 deletions include/sbi/riscv_encoding.h
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Original file line number Diff line number Diff line change
Expand Up @@ -736,6 +736,15 @@
#define MSECCFG_SSEED_SHIFT (9)
#define MSECCFG_SSEED (_UL(1) << MSECCFG_SSEED_SHIFT)

/* msdcfg */
#define CSR_MSDCFG 0xbd0
#define MSDCFG_SSM_SHIFT (19)
#define MSDCFG_SRL_SHIFT (20)
#define MSDCFG_SML_SHIFT (24)
#define MSDCFG_SSM (_UL(1) << MSDCFG_SSM_SHIFT)
#define MSDCFG_SRL_MASK GENMASK_ULL(23, 20)
#define MSDCFG_SML_MASK GENMASK_ULL(27, 24)

/* Counter Overflow CSR */
#define CSR_SCOUNTOVF 0xda0

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9 changes: 9 additions & 0 deletions lib/sbi/sbi_hart.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1063,6 +1063,7 @@ int sbi_hart_reinit(struct sbi_scratch *scratch)
int sbi_hart_init(struct sbi_scratch *scratch, bool cold_boot)
{
int rc;
struct sbi_trap_info trap = {0};

/*
* Clear mip CSR before proceeding with init to avoid any spurious
Expand All @@ -1084,6 +1085,14 @@ int sbi_hart_init(struct sbi_scratch *scratch, bool cold_boot)
if (rc)
return rc;

// TODO: check smmtt available
csr_read_allowed(CSR_MSDCFG, &trap);
if (!trap.cause) {
// SSM=0; SRL=SML=5
csr_clear(CSR_MSDCFG, MSDCFG_SSM);
csr_set(CSR_MSDCFG, (5 << MSDCFG_SRL_SHIFT) | (5 << MSDCFG_SML_SHIFT));
}

return sbi_hart_reinit(scratch);
}

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