48 lines
1.3 KiB
C++
48 lines
1.3 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 = {
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.present = 0,
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.write = 0,
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.user = 0,
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.address = 0, //(uintptr_t)&(table->l3) >> 12,
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};
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table->l3 = {
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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->l2)/sizeof(table->l2[0]); i++){
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table->l2[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<0x40000000/4096; 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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}
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