30 lines
686 B
C++
30 lines
686 B
C++
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#include "gdtc.h"
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gdtEntry_t gdt[3];
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void gdtSetGate(int num, uint64_t base, uint64_t limit, uint8_t access,
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uint8_t gran){
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gdt[num].lBase = (base & 0xFFFF);
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gdt[num].mBase = (base >> 16) & 0xFF;
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gdt[num].hBase = (base >> 24) & 0xFF;
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gdt[num].lLimit = (limit & 0xFFFF);
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gdt[num].granularity = ((limit >> 16) & 0x0F);
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gdt[num].granularity |= (gran & 0xF0);
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gdt[num].access = access;
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}
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void setupGdt(){
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gdtPointer.limit = (sizeof(gdtEntry_t) * 3) - 1;
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gdtPointer.base = &gdt;
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gdtSetGate(0, 0, 0, 0, 0);
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gdtSetGate(1, 0, 0xFFFFFFFF, 0x9A, 0xCF);
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gdtSetGate(2, 0, 0xFFFFFFFF, 0x92, 0xCF);
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loadGdt();
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}
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