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sbi: sbi_domain_context: Check privilege spec version before accessing S-mode CSRs

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SCOUNTEREN and SENVCFG may not be supported on certain RISC-V core,
so check the existence of these CSRs via privilege spec version to
prevent illegal instructions.

Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com>
Signed-off-by: Alvin Chang <alvinga@andestech.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Yu Chien Peter Lin 2024-03-28 11:33:02 +08:00 • committed by Anup Patel
parent 7862c244bc
commit 29ecda9c20
1 changed files with 4 additions and 2 deletions
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6
lib/sbi/sbi_domain_context.c
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@ -55,8 +55,10 @@ static void switch_to_next_domain_context(struct sbi_context *ctx,
ctx->stval = csr_swap(CSR_STVAL, dom_ctx->stval);
ctx->sip = csr_swap(CSR_SIP, dom_ctx->sip);
ctx->satp = csr_swap(CSR_SATP, dom_ctx->satp);
ctx->scounteren = csr_swap(CSR_SCOUNTEREN, dom_ctx->scounteren);
ctx->senvcfg = csr_swap(CSR_SENVCFG, dom_ctx->senvcfg);
if (sbi_hart_priv_version(scratch) >= SBI_HART_PRIV_VER_1_10)
ctx->scounteren = csr_swap(CSR_SCOUNTEREN, dom_ctx->scounteren);
if (sbi_hart_priv_version(scratch) >= SBI_HART_PRIV_VER_1_12)
ctx->senvcfg = csr_swap(CSR_SENVCFG, dom_ctx->senvcfg);
/* Save current trap state and restore target domain's trap state */
trap_regs = (struct sbi_trap_regs *)(csr_read(CSR_MSCRATCH) -