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lib: sbi_domain: print unsupported SmePMP permissions

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The reg->flag is encoded with 6 bits to specify RWX
permissions for M-mode and S-/U-mode. However, only
16 of the possible encodings are valid on SmePMP.

Add a warning message when an unsupported permission
encoding is detected.

Signed-off-by: Yu-Chien Peter Lin <peter.lin@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20251008084444.3525615-4-peter.lin@sifive.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Yu-Chien Peter Lin
2025-10-08 16:44:39 +08:00
committed by Anup Patel
parent 667eed2266
commit 90c3b94094
1 changed files with 6 additions and 0 deletions
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6
lib/sbi/sbi_domain.c
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@ -125,6 +125,7 @@ void sbi_domain_memregion_init(unsigned long addr,
unsigned int sbi_domain_get_smepmp_flags(struct sbi_domain_memregion *reg)
{
unsigned int pmp_flags = 0;
unsigned long rstart, rend;
if ((reg->flags & SBI_DOMAIN_MEMREGION_ACCESS_MASK) == 0) {
/*
@ -185,6 +186,11 @@ unsigned int sbi_domain_get_smepmp_flags(struct sbi_domain_memregion *reg)
pmp_flags |= PMP_W;
if (reg->flags & SBI_DOMAIN_MEMREGION_SU_EXECUTABLE)
pmp_flags |= PMP_X;
} else {
rstart = reg->base;
rend = (reg->order < __riscv_xlen) ? rstart + ((1UL << reg->order) - 1) : -1UL;
sbi_printf("%s: Unsupported Smepmp permissions on region 0x%"PRILX"-0x%"PRILX"\n",
__func__, rstart, rend);
}
return pmp_flags;