riscv/vmm: use Svpbmt extension when available
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e3d65aa628
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@ -246,6 +246,7 @@ level4:
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#define PT_FLAG_USER ((uint64_t)1 << 4)
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#define PT_FLAG_ACCESSED ((uint64_t)1 << 6)
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#define PT_FLAG_DIRTY ((uint64_t)1 << 7)
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#define PT_FLAG_PBMT_NC ((uint64_t)1 << 62)
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#define PT_PADDR_MASK ((uint64_t)0x003ffffffffffc00)
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#define PT_FLAG_RWX (PT_FLAG_READ | PT_FLAG_WRITE | PT_FLAG_EXEC)
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@ -265,6 +266,8 @@ static uint64_t pt_to_vmm_flags_internal(pt_entry_t entry) {
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flags |= VMM_FLAG_WRITE;
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if (!(entry & PT_FLAG_EXEC))
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flags |= VMM_FLAG_NOEXEC;
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if (entry & PT_FLAG_PBMT_NC)
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flags |= VMM_FLAG_FB;
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return flags;
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}
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@ -331,11 +334,19 @@ done:
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return 6 + max_level;
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}
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static pt_entry_t pbmt_nc = 0;
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pagemap_t new_pagemap(int paging_mode) {
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pagemap_t pagemap;
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pagemap.paging_mode = paging_mode;
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pagemap.max_page_size = paging_mode - 6;
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pagemap.top_level = ext_mem_alloc(PT_SIZE);
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if (riscv_check_isa_extension("svpbmt", NULL, NULL)) {
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printv("riscv: Svpbmt extension is supported.\n");
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pbmt_nc = PT_FLAG_PBMT_NC;
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}
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return pagemap;
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}
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@ -351,6 +362,8 @@ void map_page(pagemap_t pagemap, uint64_t virt_addr, uint64_t phys_addr, uint64_
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ptflags |= PT_FLAG_WRITE;
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if (!(flags & VMM_FLAG_NOEXEC))
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ptflags |= PT_FLAG_EXEC;
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if (flags & VMM_FLAG_FB)
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ptflags |= pbmt_nc;
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// Start at the highest level.
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// The values of `enum page_size` map to the level index at which that size is mapped.
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@ -80,7 +80,7 @@ static inline struct rhct_hart_info *rhct_get_hart_info(struct rhct *rhct, uint3
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return NULL;
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}
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void riscv_init(void) {
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void init_riscv(void) {
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struct madt *madt = acpi_get_table("APIC", 0);
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struct rhct *rhct = acpi_get_table("RHCT", 0);
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if (madt == NULL || rhct == NULL) {
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@ -221,7 +221,7 @@ static bool parse_extension(const char **s, struct isa_extension *ext) {
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}
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static bool extension_matches(const struct isa_extension *ext, const char *name) {
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for (size_t i = ext->name_len; i > 0; i--) {
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for (size_t i = 0; i < ext->name_len; i++) {
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const char c1 = tolower(ext->name[i]);
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const char c2 = tolower(*name++);
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if (c2 == '\0' || c1 != c2) {
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