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Full PMM implementation

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Tom-on
2025-04-04 16:58:54 +02:00
parent 5d7a4d790f
commit 25771de53e
6 changed files with 78 additions and 28 deletions
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kernel/src/paging.c
+13 -3
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@@ -16,6 +16,15 @@ static inline void invalidate(uint32_t vaddr) {
__asm__ volatile ("invlpg %0" : : "m"(vaddr));
}
// Temp paging thing
uint32_t tempFrameStart;
void pag_registerTempFrame(uint32_t target) { tempFrameStart = target; }
uint32_t pag_tempFrame(void) {
uint32_t fin = tempFrameStart;
tempFrameStart += PAGE_SIZE;
return fin;
}
int pag_init(void) {
// Unmap first MB
init_pagedir[0] = 0;
@@ -44,7 +53,6 @@ void pag_mapPage(uint32_t vaddr, uint32_t paddr, uint32_t flags) {
// Switch to the init pagedir if in kernel memory
if (vaddr >= KERNEL_BASE) {
prevpd = pag_getPagedir();
if (prevpd != init_pagedir) pag_setPagedir(init_pagedir);
}
@@ -57,14 +65,17 @@ void pag_mapPage(uint32_t vaddr, uint32_t paddr, uint32_t flags) {
// Allocate a pagetab if it didn't exist
if (!(pagedir[pdi] & PAGE_FLAG_PRESENT)) {
uint32_t tabaddr = (uint32_t)pmm_alloc(1);
uint32_t tabaddr = pmm_ready ? (uint32_t)pmm_alloc(1) : pag_tempFrame();
pagedir[pdi] = tabaddr |
PAGE_FLAG_PRESENT | PAGE_FLAG_WRITE | PAGE_FLAG_OWNER | flags;
invalidate(vaddr);
for (size_t i = 0; i < 1024; i++) {
pagetab[i] = 0;
}
}
// The actuall mapping
@@ -85,7 +96,6 @@ uint32_t pag_umapPage(uint32_t vaddr) {
if (vaddr >= KERNEL_BASE) {
prevpd = pag_getPagedir();
if (prevpd != init_pagedir) pag_setPagedir(init_pagedir);
}