91 lines
2.4 KiB
C++
91 lines
2.4 KiB
C++
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#include "pagetable.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 create_basic_page_table(uintptr_t base){
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//pagedirectory_entry_t *l4 = (pagedirectory_entry_t *)(base + (0 * 4096));
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//pagedirectory_entry_t *l3 = (pagedirectory_entry_t *)(base + (1 * 4096));
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//pagedirectory_entry_t *l2 = (pagedirectory_entry_t *)(base + (2 * 4096));
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//pagetable_entry_t *l1 = (pagetable_entry_t *) (base + (7 * 4096));
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four_lvl_paging_t* table = (four_lvl_paging_t*)base;
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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) >> 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) >> 12,
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};
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for(uint32_t i=0; i<sizeof(table->l1)/sizeof(table->l1[0]); 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)&(table->l1[i]) >> 12,
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};
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}
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//kernel memory
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for(uintptr_t i=0; i<0x4000000/4096; 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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table->l1[0].entries[0].present = 0;
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////map ioapic
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//uintptr_t ioapic_page = 0xfec00000 >> 12;
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//table->l1[ioapic_page/512].entries[ioapic_page%512].address = ioapic_page;
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//table->l1[ioapic_page/512].entries[ioapic_page%512].present = 1;
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//table->l1[ioapic_page/512].entries[ioapic_page%512].write = 1;
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}
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