diff options
| author | Anup Patel <anup.patel@wdc.com> | 2020-04-23 11:52:30 +0530 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2020-04-27 13:57:27 +0530 |
| commit | 1bb00ab3aeabde78579774eef8eadc7b7e765924 (patch) | |
| tree | 119d29d80996c9db45105fa9f688ef8b1aef5265 /lib/sbi/sbi_hart.c | |
| parent | 9f1b72ce66d659e91013b358939e832fb27223f5 (diff) | |
lib: No need to provide default PMP region using platform callbacks
The default (usually last) PMP region provides S-mode access to
complete memory range not covered by other PMP regions.
Currently, the default PMP region is described as platform specific
PMP region which is not appropriate because all platforms need it
and default PMP region should be part of generic library.
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Diffstat (limited to 'lib/sbi/sbi_hart.c')
| -rw-r--r-- | lib/sbi/sbi_hart.c | 24 |
1 files changed, 15 insertions, 9 deletions
diff --git a/lib/sbi/sbi_hart.c b/lib/sbi/sbi_hart.c index b5df7c4..24c3637 100644 --- a/lib/sbi/sbi_hart.c +++ b/lib/sbi/sbi_hart.c @@ -188,7 +188,7 @@ int sbi_hart_pmp_check_addr(struct sbi_scratch *scratch, unsigned long addr, static int pmp_init(struct sbi_scratch *scratch, u32 hartid) { - u32 i, count; + u32 i, pmp_idx = 0, count; unsigned long fw_start, fw_size_log2; ulong prot, addr, log2size; const struct sbi_platform *plat = sbi_platform_ptr(scratch); @@ -196,22 +196,28 @@ static int pmp_init(struct sbi_scratch *scratch, u32 hartid) if (!sbi_platform_has_pmp(plat)) return 0; + /* Firmware PMP region to protect OpenSBI firmware */ fw_size_log2 = log2roundup(scratch->fw_size); - fw_start = scratch->fw_start & ~((1UL << fw_size_log2) - 1UL); - - pmp_set(0, 0, fw_start, fw_size_log2); + fw_start = scratch->fw_start & ~((1UL << fw_size_log2) - 1UL); + pmp_set(pmp_idx++, 0, fw_start, fw_size_log2); + /* Platform specific PMP regions */ count = sbi_platform_pmp_region_count(plat, hartid); - if ((PMP_COUNT - 1) < count) - count = (PMP_COUNT - 1); - - for (i = 0; i < count; i++) { + for (i = 0; i < count && pmp_idx < (PMP_COUNT - 1); i++) { if (sbi_platform_pmp_region_info(plat, hartid, i, &prot, &addr, &log2size)) continue; - pmp_set(i + 1, prot, addr, log2size); + pmp_set(pmp_idx++, prot, addr, log2size); } + /* + * Default PMP region for allowing S-mode and U-mode access to + * memory not covered by: + * 1) Firmware PMP region + * 2) Platform specific PMP regions + */ + pmp_set(pmp_idx++, PMP_R | PMP_W | PMP_X, 0, __riscv_xlen); + return 0; } |