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https://github.com/Mathewnd/Astral.git
synced 2026-11-01 23:18:21 +00:00
Matheus
f1d3126990
As of now the VMM (pretty much a doubly linked list of regions) supports allocating and demand paging. still no deallocation though so if you allocate something you can't free it yet :')
42 lines
921 B
C
42 lines
921 B
C
#include <arch/idt.h>
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#include <arch/isr.h>
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#include <stdint.h>
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#include <stddef.h>
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idtentry_t idt[256];
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void idt_setentry(idtentry_t *e, uint64_t offset, uint16_t segment, uint16_t flags, uint8_t ist){
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e->offset1 = offset & 0xFFFF;
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e->offset2 = (offset >> 16) & 0xFFFF;
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e->offset3 = (offset >> 32) & 0xFFFFFFFF;
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e->segment = segment;
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e->flags = flags | ist;
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e->reserved = 0;
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}
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static void idt_reload(){
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idtr_t idtr;
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idtr.offset = (uint64_t)&idt;
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idtr.size = sizeof(idt)-1;
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asm("lidt (%%rax)": : "a"(&idtr) : "memory");
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}
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void idt_bspinit(){
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for(size_t i = 0; i < 256; ++i){
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idt_setentry(&idt[i], asmisr_general, 0x28, FLAGS_PRESENT | FLAGS_TYPE_INTERRUPT, 0);
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}
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for(size_t i = 0; i < 32; ++i){
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idt_setentry(&idt[i], asmisr_except, 0x28, FLAGS_PRESENT | FLAGS_TYPE_TRAP, 0);
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}
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idt_setentry(&idt[VECTOR_PF], asmisr_pagefault, 0x28, FLAGS_PRESENT | FLAGS_TYPE_TRAP, 0);
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idt_reload();
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}
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