95 lines
2.3 KiB
C++
95 lines
2.3 KiB
C++
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#include "pagetable.h"
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#include "pageframealloc.h"
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void load_cr3( void* cr3_value ) {
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asm volatile("mov %0, %%cr3" :: "r"((uint64_t)cr3_value) : "memory");
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}
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void write_identity_map(pagetable_t* identity_table, uint64_t size){
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for(uintptr_t i=0; i<size/4096; i++){
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identity_table[i/512].entries[i%512] = {
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.present = 1,
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.write = 1,
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.user = 0,
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.address = i,
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};
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}
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}
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void create_basic_page_table(four_lvl_paging_t* table, pagetable_t* kernel_identity){
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//pagetable_t* l2 = (pagetable_t*)PageFrameAllocator::alloc(true);
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table->l4.entries[0] = {
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.present = 1,
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.write = 1,
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.user = 1,
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.address = ((uintptr_t)&(table->l3.entries[0])) >> 12,
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};
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table->l3.entries[0] = {
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.present = 1,
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.write = 1,
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.user = 1,
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.address = ((uintptr_t)&(table->l2.entries[0])) >> 12,
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};
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//kernel memory
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for(uint32_t i=0; i<KERNEL_MEMORY_BORDER/4096/512; i++){
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table->l2.entries[i] = {
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.present = 1,
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.write = 1,
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.user = 1,
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.address = (uintptr_t)(&kernel_identity[i]) >> 12,
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};
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}
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//write_identity_map(table->l1, KERNEL_MEMORY_BORDER);
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//for(uintptr_t i=0; i<KERNEL_MEMORY_BORDER/4096; i++){
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// table->l1[i/512].entries[i%512] = {
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// .present = 1,
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// .write = 1,
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// .user = 0,
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// .address = i,
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// };
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//}
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//add ioapic address to pagetable
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table->l3.entries[3] = {
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.present = 1,
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.write = 1,
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.user = 1,
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.address = (uintptr_t)&(table->l2_apic) >> 12,
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};
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table->l2_apic.entries[502] = {
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.present = 1,
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.write = 1,
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.user = 1,
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.address = (uintptr_t)&(table->ioapic) >> 12,
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};
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table->ioapic.entries[0] = {
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.present = 1,
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.write = 1,
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.user = 0,
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.address = 0xFEC00,
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};
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//lapic
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table->l2_apic.entries[503] = {
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.present = 1,
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.write = 1,
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.user = 1,
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.address = (uintptr_t)&(table->lapic) >> 12,
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};
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table->lapic.entries[0] = {
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.present = 1,
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.write = 1,
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.user = 0,
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.address = 0xFEE00,
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};
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//unmap 0 page
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kernel_identity[0].entries[0].present = 0;
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}
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