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Added x86_64 paging and ELF loader

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This commit is contained in:
Jozef Nagy 2025-01-31 21:12:29 +01:00
parent 36ae3ec0b7
commit a39e30d17e
Signed by untrusted user who does not match committer: crz
GPG key ID: 459A4811CEAC7068
6 changed files with 309 additions and 4 deletions
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68
boot/arch/x86_64/common/mm/paging.c Normal file
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/*********************************************************************************/
/* Module Name: paging.c */
/* Project: AurixOS */
/* */
/* Copyright (c) 2024-2025 Jozef Nagy */
/* */
/* This source is subject to the MIT License. */
/* See License.txt in the root of this repository. */
/* All other rights reserved. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR */
/* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, */
/* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE */
/* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER */
/* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, */
/* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE */
/* SOFTWARE. */
/*********************************************************************************/
#include <mm/mman.h>
#include <mm/vmm.h>
#include <lib/string.h>
#include <print.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)
{
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;
}
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()
{
uint64_t *pm = (uint64_t *)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);
debug("create_pagemap(): Created new pm at 0x%lx\n", (uint64_t)pm);
return pm;
}