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This commit is contained in:
Kamil Kowalczyk
2025-09-27 15:16:26 +02:00
parent 5af7c5276a
commit 3b1bb9d531
63 changed files with 1087 additions and 407 deletions
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18
kernel/hal/x86_64/vmm.c
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@ -29,12 +29,16 @@ PgIndex hal_vmm_pageindex(uint64_t vaddr) {
return ret;
}
uint64_t *hal_vmm_nexttable(uint64_t *table, uint64_t ent) {
uint64_t *hal_vmm_nexttable(uint64_t *table, uint64_t ent, bool alloc) {
uint64_t entry = table[ent];
uint64_t phys;
if (entry & HAL_PG_PRESENT) {
phys = entry & ~0xFFFULL;
} else {
if (!alloc) {
return NULL;
}
uint8_t *newphys = pmm_alloc(1);
phys = (uint64_t)newphys;
hal_memset(VIRT(phys), 0, HAL_PAGE_SIZE);
@ -47,9 +51,9 @@ void hal_vmm_map_page(uint64_t cr3phys, uint64_t virtaddr, uint64_t physaddr, ui
uint64_t *pml4 = (uint64_t *)VIRT(cr3phys);
PgIndex pi = hal_vmm_pageindex(virtaddr);
uint64_t *pml3 = hal_vmm_nexttable(pml4, pi.pml4);
uint64_t *pml2 = hal_vmm_nexttable(pml3, pi.pml3);
uint64_t *pml1 = hal_vmm_nexttable(pml2, pi.pml2);
uint64_t *pml3 = hal_vmm_nexttable(pml4, pi.pml4, true);
uint64_t *pml2 = hal_vmm_nexttable(pml3, pi.pml3, true);
uint64_t *pml1 = hal_vmm_nexttable(pml2, pi.pml2, true);
uint64_t *pte = &pml1[pi.pml1];
*pte = (physaddr & ~0xFFFULL) | ((uint64_t)flags & 0x7ULL);
@ -59,9 +63,9 @@ void hal_vmm_unmap_page(uint64_t cr3phys, uint64_t virtaddr, uint64_t physaddr)
uint64_t *pml4 = (uint64_t *)VIRT(cr3phys);
PgIndex pi = hal_vmm_pageindex(virtaddr);
uint64_t *pml3 = hal_vmm_nexttable(pml4, pi.pml4);
uint64_t *pml2 = hal_vmm_nexttable(pml3, pi.pml3);
uint64_t *pml1 = hal_vmm_nexttable(pml2, pi.pml2);
uint64_t *pml3 = hal_vmm_nexttable(pml4, pi.pml4, false);
uint64_t *pml2 = hal_vmm_nexttable(pml3, pi.pml3, false);
uint64_t *pml1 = hal_vmm_nexttable(pml2, pi.pml2, false);
uint64_t *pte = &pml1[pi.pml1];
*pte &= ~HAL_PG_PRESENT;