#include <kernel/utils.h>

struct idt_entry {
	unsigned short base_low;
	unsigned short selector;
	unsigned char always0;
	unsigned char flags;
	unsigned short base_high;
} __attribute__((packed));

struct idt_ptr {
	unsigned short limit;
	unsigned int base;
}__attribute__((packed));

struct idt_entry idt[256]; // Interrupt table of 256 entries
struct idt_ptr idtp; // Pointer to idt table

extern void idt_load();

void idt_set_gate(unsigned char num, unsigned long base, unsigned short sel, unsigned char flags) {
	idt[num].base_low = base & 0xFFFF;
	idt[num].base_high = (base >> 16) & 0xFFFF;
	
	idt[num].selector = sel;
	idt[num].always0 = 0;
	
	// Must be uncommented when we get to usermode - it sets the permission
	// level to 3
	idt[num].flags = flags; // | 0x60;
}

void idt_install() {
	idtp.limit = (sizeof (struct idt_entry) * 256) - 1;
	idtp.base = &idt;
	
	memset(&idt, 0, sizeof(struct idt_entry) * 256);
	
	// All ISRs go here
	
	idt_load();
}