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lib: sbi_domain: add sbi_domain_get_oldpmp_flags

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Factor out logic in `sbi_hart_oldpmp_configure` into function
`sbi_domain_get_oldpmp_flags`, analogous to `sbi_domain_get_smepmp_flags`.
Platform specific hart-protection implementation can now leverage it.

Signed-off-by: Bo Gan <ganboing@gmail.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20251218104243.562667-3-ganboing@gmail.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Bo Gan
2025-12-18 02:42:38 -08:00
committed by Anup Patel
parent 707aa3231a
commit 2c1bf5bb73
3 changed files with 30 additions and 16 deletions
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7
include/sbi/sbi_domain.h
View File

@@ -253,6 +253,13 @@ void sbi_domain_memregion_init(unsigned long addr,
unsigned long flags,
struct sbi_domain_memregion *reg);
/**
* Return the oldpmp pmpcfg LRWX encoding for the flags in @reg.
*
* @param reg pointer to memory region; its flags field encodes permissions.
*/
unsigned int sbi_domain_get_oldpmp_flags(struct sbi_domain_memregion *reg);
/**
* Return the Smepmp pmpcfg LRWX encoding for the flags in @reg.
*

22
lib/sbi/sbi_domain.c
View File

@@ -121,6 +121,28 @@ void sbi_domain_memregion_init(unsigned long addr,
}
}
unsigned int sbi_domain_get_oldpmp_flags(struct sbi_domain_memregion *reg)
{
unsigned int pmp_flags = 0;
/*
* 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;
return pmp_flags;
}
unsigned int sbi_domain_get_smepmp_flags(struct sbi_domain_memregion *reg)
{
unsigned int pmp_flags = 0;

17
lib/sbi/sbi_hart_pmp.c
View File

@@ -272,22 +272,7 @@ static int sbi_hart_oldpmp_configure(struct sbi_scratch *scratch)
if (!is_valid_pmp_idx(pmp_count, pmp_idx))
return SBI_EFAIL;
pmp_flags = 0;
/*
* 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_flags = sbi_domain_get_oldpmp_flags(reg);
pmp_addr = reg->base >> PMP_SHIFT;
if (pmp_log2gran <= reg->order && pmp_addr < pmp_addr_max) {
sbi_platform_pmp_set(sbi_platform_ptr(scratch),