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lib: sbi: split PMP encoding and CSR access

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Allow PMP encoding functions to be shared with non-hart PMP manipulation
by splitting encoding / decoding and hart PMP CSR access into their own
functions.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20260430045528.420437-3-npiggin@gmail.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Nicholas Piggin
2026-04-30 14:55:19 +10:00
committed by Anup Patel
parent 8ae3b0985a
commit c93a89f214
1 changed files with 76 additions and 49 deletions
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lib/sbi/riscv_asm.c
+76 -49
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@@ -336,18 +336,51 @@ int is_pmp_entry_mapped(unsigned long entry)
return false;
}
static int pmp_encode(pmp_t *pmp, unsigned long prot, unsigned long addr,
unsigned long log2len)
{
/* check parameters */
if (log2len > __riscv_xlen || log2len < PMP_SHIFT)
return SBI_EINVAL;
/* encode PMP config */
prot &= ~PMP_A;
prot |= (log2len == PMP_SHIFT) ? PMP_A_NA4 : PMP_A_NAPOT;
pmp->cfg = prot;
/* encode PMP address */
if (log2len == PMP_SHIFT) {
pmp->addr = (addr >> PMP_SHIFT);
} else {
if (log2len == __riscv_xlen) {
pmp->addr = -1UL;
} else {
unsigned long addrmask;
addrmask = (1UL << (log2len - PMP_SHIFT)) - 1;
pmp->addr = ((addr >> PMP_SHIFT) & ~addrmask);
pmp->addr |= (addrmask >> 1);
}
}
return SBI_OK;
}
int pmp_set(unsigned int n, unsigned long prot, unsigned long addr,
unsigned long log2len)
{
int pmpcfg_csr, pmpcfg_shift, pmpaddr_csr;
unsigned long cfgmask, pmpcfg;
unsigned long addrmask;
pmp_t pmp;
int rc;
/* check parameters */
if (n >= PMP_COUNT || log2len > __riscv_xlen || log2len < PMP_SHIFT)
if (n >= PMP_COUNT)
return SBI_EINVAL;
rc = pmp_encode(&pmp, prot, addr, log2len);
if (rc)
return rc;
/* calculate PMP register and offset */
#if __riscv_xlen == 32
pmpcfg_csr = CSR_PMPCFG0 + (n >> 2);
@@ -360,24 +393,6 @@ int pmp_set(unsigned int n, unsigned long prot, unsigned long addr,
#endif
pmpaddr_csr = CSR_PMPADDR0 + n;
/* encode PMP config */
prot &= ~PMP_A;
prot |= (log2len == PMP_SHIFT) ? PMP_A_NA4 : PMP_A_NAPOT;
pmp.cfg = prot;
/* encode PMP address */
if (log2len == PMP_SHIFT) {
pmp.addr = (addr >> PMP_SHIFT);
} else {
if (log2len == __riscv_xlen) {
pmp.addr = -1UL;
} else {
addrmask = (1UL << (log2len - PMP_SHIFT)) - 1;
pmp.addr = ((addr >> PMP_SHIFT) & ~addrmask);
pmp.addr |= (addrmask >> 1);
}
}
/* write csrs */
csr_write_num(pmpaddr_csr, pmp.addr);
cfgmask = ~(0xffUL << pmpcfg_shift);
@@ -388,18 +403,54 @@ int pmp_set(unsigned int n, unsigned long prot, unsigned long addr,
return 0;
}
static int pmp_decode(pmp_t *pmp, unsigned long *prot_out, unsigned long *addr_out,
unsigned long *log2len)
{
unsigned long prot;
unsigned long t1, addr, len;
/* check parameters */
if (!prot_out || !addr_out || !log2len)
return SBI_EINVAL;
*prot_out = *addr_out = *log2len = 0;
/* decode PMP config */
prot = pmp->cfg;
/* decode PMP address */
if ((prot & PMP_A) == PMP_A_NAPOT) {
addr = pmp->addr;
if (addr == -1UL) {
addr = 0;
len = __riscv_xlen;
} else {
t1 = ctz(~addr);
addr = (addr & ~((1UL << t1) - 1)) << PMP_SHIFT;
len = (t1 + PMP_SHIFT + 1);
}
} else {
addr = pmp->addr << PMP_SHIFT;
len = PMP_SHIFT;
}
/* return details */
*prot_out = prot;
*addr_out = addr;
*log2len = len;
return SBI_OK;
}
int pmp_get(unsigned int n, unsigned long *prot_out, unsigned long *addr_out,
unsigned long *log2len)
{
int pmpcfg_csr, pmpcfg_shift, pmpaddr_csr;
unsigned long cfgmask, prot;
unsigned long t1, addr, len;
unsigned long cfgmask;
pmp_t pmp;
/* check parameters */
if (n >= PMP_COUNT || !prot_out || !addr_out || !log2len)
if (n >= PMP_COUNT)
return SBI_EINVAL;
*prot_out = *addr_out = *log2len = 0;
/* calculate PMP register and offset */
#if __riscv_xlen == 32
@@ -417,29 +468,5 @@ int pmp_get(unsigned int n, unsigned long *prot_out, unsigned long *addr_out,
pmp.cfg = (csr_read_num(pmpcfg_csr) & cfgmask) >> pmpcfg_shift;
pmp.addr = csr_read_num(pmpaddr_csr);
/* decode PMP config */
prot = pmp.cfg;
/* decode PMP address */
if ((prot & PMP_A) == PMP_A_NAPOT) {
addr = pmp.addr;
if (addr == -1UL) {
addr = 0;
len = __riscv_xlen;
} else {
t1 = ctz(~addr);
addr = (addr & ~((1UL << t1) - 1)) << PMP_SHIFT;
len = (t1 + PMP_SHIFT + 1);
}
} else {
addr = pmp.addr << PMP_SHIFT;
len = PMP_SHIFT;
}
/* return details */
*prot_out = prot;
*addr_out = addr;
*log2len = len;
return 0;
return pmp_decode(&pmp, prot_out, addr_out, log2len);
}