#include <stdbool.h>

#include <kernel/x86/idt.h>

__attribute__((aligned(0x10)))
static idt_entry_t idt[256];

static idtr_t idtr;

static bool vectors[IDT_MAX_DESCRIPTORS];

void exception_handler()
{
	__asm__ volatile ("cli; hlt"); // hangs the computer
}

void idt_set_descriptor(uint8_t vector, void *isr, uint8_t flags)
{
	idt_entry_t* descriptor = &idt[vector];

	descriptor->isr_low = (uint32_t) isr & 0xFFFF;
	descriptor->kernel_cs = 0x08; // this is whatever the kernel code selector is in the GDT
	descriptor->attributes = flags;
	descriptor->isr_high = (uint32_t) isr >> 16;
	descriptor->reserved = 0;
}


extern void* isr_stub_table[];
void idt_init(void)
{
	idtr.base = (uintptr_t)&idt[0];
	idtr.limit = (uint16_t) sizeof(idt_entry_t) * IDT_MAX_DESCRIPTORS - 1;

	for (uint8_t vector = 0; vector < 32; vector++) {
		idt_set_descriptor(vector, isr_stub_table[vector], 0x8E);
		vectors[vector] = true;
	}

	__asm__ volatile("lidt %0" : : "m"(idtr)); // load the new IDT
	__asm__ volatile("sti"); // set the interrupt flag
}