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lib: sbi: Use finer permission sematics to decide on PMP bits

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Use the fine grained permission bits to decide if the region
permissions are to be enforced on all modes. Also use the new
permission bits for deciding on R/W/X bits in pmpcfg register.

Signed-off-by: Himanshu Chauhan <hchauhan@ventanamicro.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Tested-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Himanshu Chauhan 2023-01-09 05:20:38 +00:00 • committed by Anup Patel
parent 22dbdb3d60
commit 1ac14f10f6
1 changed files with 13 additions and 7 deletions
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20
lib/sbi/sbi_hart.c
View file

@ -303,15 +303,21 @@ int sbi_hart_pmp_configure(struct sbi_scratch *scratch)
break;
pmp_flags = 0;
if (reg->flags & SBI_DOMAIN_MEMREGION_READABLE)
pmp_flags |= PMP_R;
if (reg->flags & SBI_DOMAIN_MEMREGION_WRITEABLE)
pmp_flags |= PMP_W;
if (reg->flags & SBI_DOMAIN_MEMREGION_EXECUTABLE)
pmp_flags |= PMP_X;
if (reg->flags & SBI_DOMAIN_MEMREGION_MMODE)
/*
* If permissions are to be enforced for all modes on this
* region, the lock bit should be set.
*/
if (reg->flags & SBI_DOMAIN_MEMREGION_ENF_PERMISSIONS)
pmp_flags |= PMP_L;
if (reg->flags & SBI_DOMAIN_MEMREGION_SU_READABLE)
pmp_flags |= PMP_R;
if (reg->flags & SBI_DOMAIN_MEMREGION_SU_WRITABLE)
pmp_flags |= PMP_W;
if (reg->flags & SBI_DOMAIN_MEMREGION_SU_EXECUTABLE)
pmp_flags |= PMP_X;
pmp_addr = reg->base >> PMP_SHIFT;
if (pmp_gran_log2 <= reg->order && pmp_addr < pmp_addr_max)
pmp_set(pmp_idx++, pmp_flags, reg->base, reg->order);