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I don't even know what to write at this point

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This commit is contained in:
Jozef Nagy 2025-03-10 17:10:35 +01:00
parent df0ebbbbcd
commit 72a46bc7ce
Signed by untrusted user who does not match committer: crz
GPG key ID: 459A4811CEAC7068
12 changed files with 235 additions and 96 deletions
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70
boot/arch/x86_64/common/mm/paging.c
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@ -21,48 +21,64 @@
#include <mm/vmm.h>
#include <lib/string.h>
#include <print.h>
#include <axboot.h>
#include <stdint.h>
/* Trimmed down version of */
/* https://github.com/KevinAlavik/nekonix/blob/main/kernel/src/mm/vmm.c */
/* Thanks, Kevin <3 */
void map_page(uintptr_t *pm, uintptr_t virt, uintptr_t phys, uint64_t flags)
void map_pages(pagetable *pm, uintptr_t virt, uintptr_t phys, size_t size, uint64_t flags)
{
uint64_t pml1_idx = (virt & (uint64_t)0x1ff << 12) >> 12;
uint64_t pml2_idx = (virt & (uint64_t)0x1ff << 21) >> 21;
uint64_t pml3_idx = (virt & (uint64_t)0x1ff << 30) >> 30;
uint64_t pml4_idx = (virt & (uint64_t)0x1ff << 39) >> 39;
if (!(pm[pml4_idx] & 1)) {
pm[pml4_idx] = (uint64_t)mem_alloc(PAGE_SIZE) | flags;
for (size_t i = 0; i < ROUND_UP(size, PAGE_SIZE); i += PAGE_SIZE) {
map_page(pm, virt + i, phys + i, flags);
}
uint64_t *pml3_table = (uint64_t *)(pm[pml4_idx] & 0x000FFFFFFFFFF000);
if (!(pml3_table[pml3_idx] & 1)) {
pml3_table[pml3_idx] = (uint64_t)mem_alloc(PAGE_SIZE) | flags;
}
uint64_t *pml2_table = (uint64_t *)(pml3_table[pml3_idx] & 0x000FFFFFFFFFF000);
if (!(pml2_table[pml2_idx] & 1)) {
pml2_table[pml2_idx] = (uint64_t)mem_alloc(PAGE_SIZE) | flags;
}
uint64_t *pml1_table = (uint64_t *)(pml2_table[pml2_idx] & 0x000FFFFFFFFFF000);
pml1_table[pml1_idx] = phys | flags;
debug("map_page(): Mapped 0x%lx -> 0x%lx\n", phys, virt);
}
uintptr_t *create_pagemap()
void map_page(pagetable *pm, uintptr_t virt, uintptr_t phys, uint64_t flags)
{
uint64_t *pm = (uint64_t *)mem_alloc(PAGE_SIZE);
uint64_t pml1_idx = (virt >> 12) & 0x1ff;
uint64_t pml2_idx = (virt >> 21) & 0x1ff;
uint64_t pml3_idx = (virt >> 30) & 0x1ff;
uint64_t pml4_idx = (virt >> 39) & 0x1ff;
if (!(pm->entries[pml4_idx] & 1)) {
void *pml4 = mem_alloc(PAGE_SIZE);
memset(pml4, 0, sizeof(pagetable));
pm->entries[pml4_idx] = (uint64_t)pml4 | VMM_PRESENT | VMM_WRITABLE | VMM_USER;
}
pagetable *pml3_table = (pagetable *)(pm->entries[pml4_idx] & 0x000FFFFFFFFFF000);
if (!(pml3_table->entries[pml3_idx] & 1)) {
void *pml3 = mem_alloc(PAGE_SIZE);
memset(pml3, 0, sizeof(pagetable));
pml3_table->entries[pml3_idx] = (uint64_t)pml3 | VMM_PRESENT | VMM_WRITABLE | VMM_USER;
}
pagetable *pml2_table = (pagetable *)(pml3_table->entries[pml3_idx] & 0x000FFFFFFFFFF000);
if (!(pml2_table->entries[pml2_idx] & 1)) {
void *pml2 = mem_alloc(PAGE_SIZE);
memset(pml2, 0, sizeof(pagetable));
pml2_table->entries[pml2_idx] = (uint64_t)pml2 | VMM_PRESENT | VMM_WRITABLE | VMM_USER;
}
pagetable *pml1_table = (pagetable *)(pml2_table->entries[pml2_idx] & 0x000FFFFFFFFFF000);
if (!(pml1_table->entries[pml1_idx] & 1)) {
pml1_table->entries[pml1_idx] = (phys | 0x000FFFFFFFFFF000) | flags;
}
debug("map_page(): Mapped 0x%llx -> 0x%llx\n", phys, virt);
}
pagetable *create_pagemap()
{
pagetable *pm = (pagetable *)mem_alloc(PAGE_SIZE);
if (!pm) {
debug("create_pagemap(): Failed to allocate memory for a new pm.\n");
return NULL;
}
memset(pm, 0, PAGE_SIZE);
memset(pm, 0, sizeof(pagetable));
debug("create_pagemap(): Created new pm at 0x%lx\n", (uint64_t)pm);
debug("create_pagemap(): Created new pm at 0x%llx\n", (uint64_t)pm);
return pm;
}