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lib: sbi_hart: Store PMP granularity as log base 2

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This minimizes the need to call log2roundup() to recover the log value.

Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Samuel Holland 2023-11-22 11:44:04 -08:00 • committed by Anup Patel
parent 07419ec84b
commit 93da66b7d4
3 changed files with 19 additions and 19 deletions
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4
include/sbi/sbi_hart.h
View file

@ -73,7 +73,7 @@ struct sbi_hart_features {
unsigned long extensions[BITS_TO_LONGS(SBI_HART_EXT_MAX)];
unsigned int pmp_count;
unsigned int pmp_addr_bits;
unsigned long pmp_gran;
unsigned int pmp_log2gran;
unsigned int mhpm_mask;
unsigned int mhpm_bits;
};
@ -93,7 +93,7 @@ unsigned int sbi_hart_mhpm_mask(struct sbi_scratch *scratch);
void sbi_hart_delegation_dump(struct sbi_scratch *scratch,
const char *prefix, const char *suffix);
unsigned int sbi_hart_pmp_count(struct sbi_scratch *scratch);
unsigned long sbi_hart_pmp_granularity(struct sbi_scratch *scratch);
unsigned int sbi_hart_pmp_log2gran(struct sbi_scratch *scratch);
unsigned int sbi_hart_pmp_addrbits(struct sbi_scratch *scratch);
unsigned int sbi_hart_mhpm_bits(struct sbi_scratch *scratch);
int sbi_hart_pmp_configure(struct sbi_scratch *scratch);

30
lib/sbi/sbi_hart.c
View file

@ -267,12 +267,12 @@ unsigned int sbi_hart_pmp_count(struct sbi_scratch *scratch)
return hfeatures->pmp_count;
}
unsigned long sbi_hart_pmp_granularity(struct sbi_scratch *scratch)
unsigned int sbi_hart_pmp_log2gran(struct sbi_scratch *scratch)
{
struct sbi_hart_features *hfeatures =
sbi_scratch_offset_ptr(scratch, hart_features_offset);
return hfeatures->pmp_gran;
return hfeatures->pmp_log2gran;
}
unsigned int sbi_hart_pmp_addrbits(struct sbi_scratch *scratch)
@ -359,12 +359,12 @@ static void sbi_hart_smepmp_set(struct sbi_scratch *scratch,
struct sbi_domain_memregion *reg,
unsigned int pmp_idx,
unsigned int pmp_flags,
unsigned int pmp_gran_log2,
unsigned int pmp_log2gran,
unsigned long pmp_addr_max)
{
unsigned long pmp_addr = reg->base >> PMP_SHIFT;
if (pmp_gran_log2 <= reg->order && pmp_addr < pmp_addr_max) {
if (pmp_log2gran <= 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"
@ -376,7 +376,7 @@ static void sbi_hart_smepmp_set(struct sbi_scratch *scratch,
static int sbi_hart_smepmp_configure(struct sbi_scratch *scratch,
unsigned int pmp_count,
unsigned int pmp_gran_log2,
unsigned int pmp_log2gran,
unsigned long pmp_addr_max)
{
struct sbi_domain_memregion *reg;
@ -412,7 +412,7 @@ static int sbi_hart_smepmp_configure(struct sbi_scratch *scratch,
return 0;
sbi_hart_smepmp_set(scratch, dom, reg, pmp_idx++, pmp_flags,
pmp_gran_log2, pmp_addr_max);
pmp_log2gran, pmp_addr_max);
}
/* Set the MML to enforce new encoding */
@ -438,7 +438,7 @@ static int sbi_hart_smepmp_configure(struct sbi_scratch *scratch,
return 0;
sbi_hart_smepmp_set(scratch, dom, reg, pmp_idx++, pmp_flags,
pmp_gran_log2, pmp_addr_max);
pmp_log2gran, pmp_addr_max);
}
/*
@ -451,7 +451,7 @@ static int sbi_hart_smepmp_configure(struct sbi_scratch *scratch,
static int sbi_hart_oldpmp_configure(struct sbi_scratch *scratch,
unsigned int pmp_count,
unsigned int pmp_gran_log2,
unsigned int pmp_log2gran,
unsigned long pmp_addr_max)
{
struct sbi_domain_memregion *reg;
@ -481,7 +481,7 @@ static int sbi_hart_oldpmp_configure(struct sbi_scratch *scratch,
pmp_flags |= PMP_X;
pmp_addr = reg->base >> PMP_SHIFT;
if (pmp_gran_log2 <= reg->order && pmp_addr < pmp_addr_max) {
if (pmp_log2gran <= 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"
@ -508,7 +508,7 @@ int sbi_hart_map_saddr(unsigned long addr, unsigned long size)
if (is_pmp_entry_mapped(SBI_SMEPMP_RESV_ENTRY))
return SBI_ENOSPC;
for (order = log2roundup(MAX(sbi_hart_pmp_granularity(scratch), size));
for (order = MAX(sbi_hart_pmp_log2gran(scratch), log2roundup(size));
order <= __riscv_xlen; order++) {
if (order < __riscv_xlen) {
base = addr & ~((1UL << order) - 1UL);
@ -540,23 +540,23 @@ int sbi_hart_unmap_saddr(void)
int sbi_hart_pmp_configure(struct sbi_scratch *scratch)
{
int rc;
unsigned int pmp_bits, pmp_gran_log2;
unsigned int pmp_bits, pmp_log2gran;
unsigned int pmp_count = sbi_hart_pmp_count(scratch);
unsigned long pmp_addr_max;
if (!pmp_count)
return 0;
pmp_gran_log2 = log2roundup(sbi_hart_pmp_granularity(scratch));
pmp_log2gran = sbi_hart_pmp_log2gran(scratch);
pmp_bits = sbi_hart_pmp_addrbits(scratch) - 1;
pmp_addr_max = (1UL << pmp_bits) | ((1UL << pmp_bits) - 1);
if (sbi_hart_has_extension(scratch, SBI_HART_EXT_SMEPMP))
rc = sbi_hart_smepmp_configure(scratch, pmp_count,
pmp_gran_log2, pmp_addr_max);
pmp_log2gran, pmp_addr_max);
else
rc = sbi_hart_oldpmp_configure(scratch, pmp_count,
pmp_gran_log2, pmp_addr_max);
pmp_log2gran, pmp_addr_max);
/*
* As per section 3.7.2 of privileged specification v1.12,
@ -874,7 +874,7 @@ static int hart_detect_features(struct sbi_scratch *scratch)
*/
val = hart_pmp_get_allowed_addr();
if (val) {
hfeatures->pmp_gran = 1 << (sbi_ffs(val) + 2);
hfeatures->pmp_log2gran = sbi_ffs(val) + 2;
hfeatures->pmp_addr_bits = sbi_fls(val) + 1;
/* Detect number of PMP regions. At least PMPADDR0 should be implemented*/
__check_csr_64(CSR_PMPADDR0, 0, val, pmp_count, __pmp_skip);

4
lib/sbi/sbi_init.c
View file

@ -176,8 +176,8 @@ static void sbi_boot_print_hart(struct sbi_scratch *scratch, u32 hartid)
sbi_printf("Boot HART ISA Extensions : %s\n", str);
sbi_printf("Boot HART PMP Count : %d\n",
sbi_hart_pmp_count(scratch));
sbi_printf("Boot HART PMP Granularity : %lu\n",
sbi_hart_pmp_granularity(scratch));
sbi_printf("Boot HART PMP Granularity : %u bits\n",
sbi_hart_pmp_log2gran(scratch));
sbi_printf("Boot HART PMP Address Bits: %d\n",
sbi_hart_pmp_addrbits(scratch));
sbi_printf("Boot HART MHPM Info : %lu (0x%08x)\n",