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This commit is contained in:
Eggert Jung
2026-02-10 16:18:19 +01:00
parent 0521c9c1ec
commit 67291f7f19
8 changed files with 96 additions and 30 deletions
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35
kernel/memory/pagetable.cc
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@@ -4,12 +4,11 @@
void load_cr3( void* cr3_value ) {
asm volatile("mov %0, %%cr3" :: "r"((uint64_t)cr3_value) : "memory");
}
void create_basic_page_table(uintptr_t base){
void create_basic_page_table(four_lvl_paging_t* table){
//pagedirectory_entry_t *l4 = (pagedirectory_entry_t *)(base + (0 * 4096));
//pagedirectory_entry_t *l3 = (pagedirectory_entry_t *)(base + (1 * 4096));
//pagedirectory_entry_t *l2 = (pagedirectory_entry_t *)(base + (2 * 4096));
//pagetable_entry_t *l1 = (pagetable_entry_t *) (base + (7 * 4096));
four_lvl_paging_t* table = (four_lvl_paging_t*)base;
table->l4.entries[0] = {
.present = 1,
@@ -25,7 +24,19 @@ void create_basic_page_table(uintptr_t base){
.address = (uintptr_t)&(table->l2) >> 12,
};
for(uint32_t i=0; i<sizeof(table->l1)/sizeof(table->l1[0]); i++){
//kernel memory
//for(uintptr_t i=0; i<0x4000000/(2*1024*1024); i++){
// table->l2.entries[i] = {
// .present = 1,
// .write = 1,
// .user = 1,
// .pat = 1, //2MB pages
// .address = i,
// };
//}
//kernel memory
for(uint32_t i=0; i<KERNEL_MEMORY_BORDER/4096/512; i++){
table->l2.entries[i] = {
.present = 1,
.write = 1,
@@ -34,8 +45,7 @@ void create_basic_page_table(uintptr_t base){
};
}
//kernel memory
for(uintptr_t i=0; i<0x4000000/4096; i++){
for(uintptr_t i=0; i<KERNEL_MEMORY_BORDER/4096; i++){
table->l1[i/512].entries[i%512] = {
.present = 1,
.write = 1,
@@ -78,13 +88,14 @@ void create_basic_page_table(uintptr_t base){
.address = 0xFEE00,
};
//unmap 0 page
table->l1[0].entries[0].present = 0;
////map ioapic
//uintptr_t ioapic_page = 0xfec00000 >> 12;
//table->l1[ioapic_page/512].entries[ioapic_page%512].address = ioapic_page;
//table->l1[ioapic_page/512].entries[ioapic_page%512].present = 1;
//table->l1[ioapic_page/512].entries[ioapic_page%512].write = 1;
}
void map_pageframe(four_lvl_paging_t* table, uintptr_t phys, uintptr_t virt){
uint64_t pagefr_nr = phys / 4096;
table->l1[pagefr_nr/512].entries[pagefr_nr%512].address = virt >> 12;
table->l1[pagefr_nr/512].entries[pagefr_nr%512].present = 1;
}