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#include <stdint.h>
#include <toxic/config.h>
#include <toxic/string.h>
#include <toxic/vga.h>
#include <toxic/idt.h>
#include <toxic/io.h>
struct int_descriptor int_table[TOTAL_INTERRUPTS];
struct int_reg_descriptor idtr_descriptor;
extern void idt_load(struct int_reg_descriptor *desc);
extern void int21h();
extern void default_handler();
void
int21h_handler(void)
{
vprintl("Keyboard pressed\n");
outb(0x20, 0x20);
}
void
default_int_handler(void)
{
/* Ack the Interrupt */
outb(0x20, 0x20);
}
static void
idt_zero()
{
vprintl("Illegal operation: Divide by zero\n");
}
static void
idt_set(int int_num, void *addr)
{
struct int_descriptor *desc = &int_table[int_num];
desc->offset_low = (uint32_t) addr & 0x0000FFFF;
desc->selector = KERNEL_CODE_SELECTOR;
desc->reserved = 0x00;
desc->type_attr = TOXIC_INT_ATTR;
desc->offset_high = (uint32_t) addr >> 16;
}
void
interrupts_init(void)
{
int i;
memset(int_table, 0, sizeof(int_table));
idtr_descriptor.limit = sizeof(int_table) - 1;
idtr_descriptor.base = (uint32_t) int_table;
for (i = 0; i < TOTAL_INTERRUPTS; i++)
idt_set(i, default_handler);
idt_set(0, idt_zero);
idt_set(0x21, int21h);
idt_load(&idtr_descriptor);
}
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