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riscv/vmm: use Svpbmt extension when available

This commit is contained in:
xvanc 2023-09-13 09:38:47 -05:00
parent 3c2a0f5717
commit f5c79b3cf6
No known key found for this signature in database
2 changed files with 15 additions and 2 deletions
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13
common/mm/vmm.c
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@ -252,6 +252,7 @@ level4:
#define PT_FLAG_USER ((uint64_t)1 << 4)
#define PT_FLAG_ACCESSED ((uint64_t)1 << 6)
#define PT_FLAG_DIRTY ((uint64_t)1 << 7)
#define PT_FLAG_PBMT_NC ((uint64_t)1 << 62)
#define PT_PADDR_MASK ((uint64_t)0x003ffffffffffc00)
#define PT_FLAG_RWX (PT_FLAG_READ | PT_FLAG_WRITE | PT_FLAG_EXEC)
@ -271,6 +272,8 @@ static uint64_t pt_to_vmm_flags_internal(pt_entry_t entry) {
flags |= VMM_FLAG_WRITE;
if (!(entry & PT_FLAG_EXEC))
flags |= VMM_FLAG_NOEXEC;
if (entry & PT_FLAG_PBMT_NC)
flags |= VMM_FLAG_FB;
return flags;
}
@ -337,11 +340,19 @@ done:
return 6 + max_level;
}
static pt_entry_t pbmt_nc = 0;
pagemap_t new_pagemap(int paging_mode) {
pagemap_t pagemap;
pagemap.paging_mode = paging_mode;
pagemap.max_page_size = paging_mode - 6;
pagemap.top_level = ext_mem_alloc(PT_SIZE);
if (riscv_check_isa_extension("svpbmt", NULL, NULL)) {
printv("riscv: Svpbmt extension is supported.\n");
pbmt_nc = PT_FLAG_PBMT_NC;
}
return pagemap;
}
@ -357,6 +368,8 @@ void map_page(pagemap_t pagemap, uint64_t virt_addr, uint64_t phys_addr, uint64_
ptflags |= PT_FLAG_WRITE;
if (!(flags & VMM_FLAG_NOEXEC))
ptflags |= PT_FLAG_EXEC;
if (flags & VMM_FLAG_FB)
ptflags |= pbmt_nc;
// Start at the highest level.
// The values of `enum page_size` map to the level index at which that size is mapped.

4
common/sys/cpu_riscv.c
View File

@ -80,7 +80,7 @@ static inline struct rhct_hart_info *rhct_get_hart_info(struct rhct *rhct, uint3
return NULL;
}
void riscv_init(void) {
void init_riscv(void) {
struct madt *madt = acpi_get_table("APIC", 0);
struct rhct *rhct = acpi_get_table("RHCT", 0);
if (madt == NULL || rhct == NULL) {
@ -221,7 +221,7 @@ static bool parse_extension(const char **s, struct isa_extension *ext) {
}
static bool extension_matches(const struct isa_extension *ext, const char *name) {
for (size_t i = ext->name_len; i > 0; i--) {
for (size_t i = 0; i < ext->name_len; i++) {
const char c1 = tolower(ext->name[i]);
const char c2 = tolower(*name++);
if (c2 == '\0' || c1 != c2) {