69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
#include <stdbool.h>
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#ifdef __TESTING__
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#include <kernel/_kernel.h>
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#include <stdio.h>
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#endif
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#include <kernel/x86/idt.h>
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#include <kernel/x86/pic.h>
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__attribute__((aligned(0x10)))
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static idt_entry_t idt[256];
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static idtr_t idtr;
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static bool vectors[IDT_MAX_DESCRIPTORS];
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void exception_handler(unsigned int i)
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{
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#ifdef __TESTING__
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kerror("EXCEPTION");
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printf("Exeption: %u\n", i);
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#endif
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if (i <= 31)
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__asm__ volatile ("cli; hlt"); // hangs the computer
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if (i == PIC_PIT) {
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printf("Sending EOI instruction to PIT\n");
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PIC_sendEOI(0);
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}
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}
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void idt_set_descriptor(uint8_t vector, void *isr, uint8_t flags)
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{
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idt_entry_t* descriptor = &idt[vector];
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descriptor->isr_low = (uint32_t) isr & 0xFFFF;
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descriptor->kernel_cs = 0x08; // this is whatever the kernel code selector is in the GDT
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descriptor->attributes = flags;
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descriptor->isr_high = (uint32_t) isr >> 16;
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descriptor->reserved = 0;
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}
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extern void* isr_stub_table[];
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void idt_init(void)
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{
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#ifdef __TESTING__
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kinfo("Initializing the IDT");
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#endif
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idtr.base = (uintptr_t)&idt[0];
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idtr.limit = (uint16_t) sizeof(idt_entry_t) * IDT_MAX_DESCRIPTORS - 1;
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for (uint8_t vector = 0; vector < IDT_MAX_DESCRIPTORS; vector++) {
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idt_set_descriptor(vector, isr_stub_table[vector], 0x8E);
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vectors[vector] = true;
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}
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// The "m" indicates actual data, not a pointer
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__asm__ volatile("lidt %0" : : "m"(idtr)); // load the new IDT
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PIC_remap(0x20, 0x28);
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//IRQ_set_mask(0xfd); // unmask IRQ1
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pic_disable(); //TODO: this is ending a timer interrupt even though its masked off..
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__asm__ volatile("sti"); // set the interrupt flag
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#ifdef __TESTING__
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kinfo("Initialized the IDT");
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#endif
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}
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