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mmu: enable global pages

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Matheus
2025-09-07 00:05:36 -03:00
parent afd5976a1e
commit accad4d70a
4 changed files with 44 additions and 10 deletions
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kernel-src/arch/x86-64/cpu.c
+2
View File
@@ -188,6 +188,8 @@ void arch_cpu_init() {
: : : "rax"
);
x86_64_mmu_enable_global_pages();
// register some exception handlers that give out signals
interrupt_register(0, div0isr, NULL, IPL_IGNORE);
interrupt_register(6, illisr, NULL, IPL_IGNORE);
kernel-src/arch/x86-64/mmu.c
+27 -6
View File
@@ -192,6 +192,22 @@ void arch_mmu_switch(pagetableptr_t table) {
asm volatile("mov %%rax, %%cr3" : : "a"(table));
}
void x86_64_mmu_enable_global_pages(void) {
asm volatile(
"mov %%cr4, %%rax;"
"or $0x80, %%rax;"
"mov %%rax, %%cr4;"
: : : "rax", "memory");
}
void x86_64_mmu_disable_global_pages(void) {
asm volatile(
"mov %%cr4, %%rax;"
"and $0xffffffffffffff7f, %%rax;"
"mov %%rax, %%cr4;"
: : : "rax", "memory");
}
// hhdm pointer to template to be used for new mappings and smp bootup
static pagetableptr_t template;
@@ -206,8 +222,13 @@ pagetableptr_t arch_mmu_newtable() {
static inline void do_invalidate(void *page, size_t size) {
// if a full reload was requested or we are doing a big release on
if (page == NULL || size >= 32 * PAGE_SIZE) {
// TODO if global pages are ever supported, we should disable them in CR4, flush, and then reenable them
if (page != NULL && IS_USER_ADDRESS(page))
x86_64_mmu_disable_global_pages();
asm volatile("mov %%cr3, %%rax; mov %%rax, %%cr3;" : : : "rax", "memory");
if (page != NULL && IS_USER_ADDRESS(page))
x86_64_mmu_enable_global_pages();
} else {
for (uintptr_t i = 0; i < size; i += PAGE_SIZE) {
uintptr_t ptr = (uintptr_t)page + i;
@@ -265,7 +286,7 @@ void arch_mmu_invalidate_range(void *page, size_t size) {
do_invalidate(page, size);
if (do_shootdown) {
while (__atomic_load_n(&shootdown_done, __ATOMIC_SEQ_CST) != shootdown_total) CPU_PAUSE();
while (__atomic_load_n(&shootdown_done, __ATOMIC_RELAXED) != shootdown_total) CPU_PAUSE();
}
}
@@ -286,9 +307,9 @@ static void *kerneladdr[6] = {
};
static mmuflags_t kernelflags[3] = {
ARCH_MMU_FLAGS_READ,
ARCH_MMU_FLAGS_READ | ARCH_MMU_FLAGS_WRITE | ARCH_MMU_FLAGS_NOEXEC,
ARCH_MMU_FLAGS_READ | ARCH_MMU_FLAGS_NOEXEC
ARCH_MMU_FLAGS_READ | ARCH_MMU_FLAGS_GLOBAL,
ARCH_MMU_FLAGS_READ | ARCH_MMU_FLAGS_WRITE | ARCH_MMU_FLAGS_NOEXEC | ARCH_MMU_FLAGS_GLOBAL,
ARCH_MMU_FLAGS_READ | ARCH_MMU_FLAGS_NOEXEC | ARCH_MMU_FLAGS_GLOBAL
};
extern volatile struct limine_memmap_request pmm_liminemap;
@@ -363,7 +384,7 @@ void arch_mmu_init() {
continue;
for (uint64_t i = 0; i < e->length; i += PAGE_SIZE) {
uint64_t entry = ((e->base + i) & ADDRMASK) | ARCH_MMU_FLAGS_READ | ARCH_MMU_FLAGS_WRITE | ARCH_MMU_FLAGS_NOEXEC;
uint64_t entry = ((e->base + i) & ADDRMASK) | ARCH_MMU_FLAGS_READ | ARCH_MMU_FLAGS_WRITE | ARCH_MMU_FLAGS_NOEXEC | ARCH_MMU_FLAGS_GLOBAL;
__assert(add_page(FROM_HHDM(template), MAKE_HHDM((void *)(e->base + i)), entry, 0));
}
}