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lib: sbi: Populate M-only Smepmp entries before setting mseccfg.MML

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Based on sections 4.c and 4.d in Ch.2 of the Smepmp spec the PMP entries
must be programmed as below:
1. Program M-only entries
2. Enable mseccfg.MML
3. Program shared-region entries
4. Program SU-only entries

Co-developed-by: Mayuresh Chitale <mchitale@ventanamicro.com>
Signed-off-by: Mayuresh Chitale <mchitale@ventanamicro.com>
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
This commit is contained in:
Anup Patel 2023-09-07 17:19:45 +05:30 • committed by Anup Patel
parent 2b51a9dd9c
commit 73aea28264
1 changed files with 59 additions and 14 deletions
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73
lib/sbi/sbi_hart.c
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@ -348,6 +348,26 @@ static unsigned int sbi_hart_get_smepmp_flags(struct sbi_scratch *scratch,
return pmp_flags;
}
static void sbi_hart_smepmp_set(struct sbi_scratch *scratch,
struct sbi_domain *dom,
struct sbi_domain_memregion *reg,
unsigned int pmp_idx,
unsigned int pmp_flags,
unsigned int pmp_gran_log2,
unsigned long pmp_addr_max)
{
unsigned long 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);
} else {
sbi_printf("Can not configure pmp for domain %s because"
" memory region address 0x%lx or size 0x%lx "
"is not in range.\n", dom->name, reg->base,
reg->order);
}
}
static int sbi_hart_smepmp_configure(struct sbi_scratch *scratch,
unsigned int pmp_count,
unsigned int pmp_gran_log2,
@ -355,9 +375,7 @@ static int sbi_hart_smepmp_configure(struct sbi_scratch *scratch,
{
struct sbi_domain_memregion *reg;
struct sbi_domain *dom = sbi_domain_thishart_ptr();
unsigned int pmp_idx = 0;
unsigned int pmp_flags;
unsigned long pmp_addr;
unsigned int pmp_idx, pmp_flags;
/*
* Set the RLB so that, we can write to PMP entries without
@ -368,32 +386,59 @@ static int sbi_hart_smepmp_configure(struct sbi_scratch *scratch,
/* Disable the reserved entry */
pmp_disable(SBI_SMEPMP_RESV_ENTRY);
/* Program M-only regions when MML is not set. */
pmp_idx = 0;
sbi_domain_for_each_memregion(dom, reg) {
/* Skip reserved entry */
if (pmp_idx == SBI_SMEPMP_RESV_ENTRY)
pmp_idx++;
if (pmp_count <= pmp_idx)
break;
/* Skip shared and SU-only regions */
if (!SBI_DOMAIN_MEMREGION_M_ONLY_ACCESS(reg->flags)) {
pmp_idx++;
continue;
}
pmp_flags = sbi_hart_get_smepmp_flags(scratch, dom, reg);
if (pmp_flags == 0)
if (!pmp_flags)
return 0;
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);
} else {
sbi_printf("Can not configure pmp for domain %s because"
" memory region address 0x%lx or size 0x%lx "
"is not in range.\n", dom->name, reg->base,
reg->order);
sbi_hart_smepmp_set(scratch, dom, reg, pmp_idx++, pmp_flags,
pmp_gran_log2, pmp_addr_max);
}
/* Set the MML to enforce new encoding */
csr_set(CSR_MSECCFG, MSECCFG_MML);
/* Program shared and SU-only regions */
pmp_idx = 0;
sbi_domain_for_each_memregion(dom, reg) {
/* Skip reserved entry */
if (pmp_idx == SBI_SMEPMP_RESV_ENTRY)
pmp_idx++;
if (pmp_count <= pmp_idx)
break;
/* Skip M-only regions */
if (SBI_DOMAIN_MEMREGION_M_ONLY_ACCESS(reg->flags)) {
pmp_idx++;
continue;
}
pmp_flags = sbi_hart_get_smepmp_flags(scratch, dom, reg);
if (!pmp_flags)
return 0;
sbi_hart_smepmp_set(scratch, dom, reg, pmp_idx++, pmp_flags,
pmp_gran_log2, pmp_addr_max);
}
/*
* All entries are programmed. Enable MML bit.
* All entries are programmed.
* Keep the RLB bit so that dynamic mappings can be done.
*/
csr_set(CSR_MSECCFG, (MSECCFG_RLB | MSECCFG_MML));
return 0;
}