blob: 8c18097d0f4903a61c11e2d9f8975d47210cac90 [file] [log] [blame]
#include "pic.h"
#include "io.h"
#include "log.h"
#define ICW1_ICW4 0x01 /* ICW4 (not) needed */
#define ICW1_SINGLE 0x02 /* Single (cascade) mode */
#define ICW1_INTERVAL4 0x04 /* Call address interval 4 (8) */
#define ICW1_LEVEL 0x08 /* Level triggered (edge) mode */
#define ICW1_INIT 0x10 /* Initialization - required! */
#define ICW4_8086 0x01 /* 8086/88 (MCS-80/85) mode */
#define ICW4_AUTO 0x02 /* Auto (normal) EOI */
#define ICW4_BUF_SLAVE 0x08 /* Buffered mode/slave */
#define ICW4_BUF_MASTER 0x0C /* Buffered mode/master */
#define ICW4_SFNM 0x10 /* Special fully nested (not) */
typedef void (*interrupt_handler_t)(struct registers *);
static interrupt_handler_t interrupt_handlers[256];
void pic_send_eoi(uchar interrupt)
{
if (interrupt >= IRQ_TO_INT(8))
outb(PIC2_COMMAND, PIC_EOI);
outb(PIC1_COMMAND, PIC_EOI);
}
void irq_handler(struct registers regs)
{
pic_send_eoi(regs.interrupt_number);
if (interrupt_handlers[regs.interrupt_number])
interrupt_handlers[regs.interrupt_number](&regs);
else
kprintf(ERROR "Unhandled hardware interrupt: %d, called from %d\n",
regs.interrupt_number, regs.eip);
}
void isr_handler(struct registers regs)
{
if (interrupt_handlers[regs.interrupt_number])
interrupt_handlers[regs.interrupt_number](&regs);
else
kprintf(ERROR "Unhandled interrupt: %d, called from %d\n",
regs.interrupt_number, regs.eip);
}
void add_interrupt_handler(uchar interrupt, void (*handler)(struct registers *))
{
interrupt_handlers[interrupt] = handler;
}
void pic_remap()
{
// I don't remember what this does.
outb(0x20, 0x11);
outb(0xA0, 0x11);
outb(0x21, 0x20);
outb(0xA1, 0x28);
outb(0x21, 0x04);
outb(0xA1, 0x02);
outb(0x21, 0x01);
outb(0xA1, 0x01);
outb(0x21, 0x0);
outb(0xA1, 0x0);
memset(interrupt_handlers, 0, sizeof(interrupt_handlers));
}