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

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);