57 lines
997 B
C
57 lines
997 B
C
#include "events/idt.h"
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#include "io.h"
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#include "pic.h"
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#include "stdio.h"
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#include "keyboard.h"
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static void send_icw1(void)
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{
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outb(MASTER_PIC_A, ICW1);
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outb(SLAVE_PIC_A, ICW1);
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}
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static void send_icw2(void)
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{
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outb(MASTER_PIC_B, IDT_RESERVED_ENTRIES);
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outb(SLAVE_PIC_B, IDT_RESERVED_ENTRIES + 8);
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}
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static void send_icw3(void)
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{
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outb(MASTER_PIC_B, 0x4);
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outb(SLAVE_PIC_B, 0x2);
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}
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static void send_icw4(void)
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{
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outb(MASTER_PIC_B, 0x1);
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outb(SLAVE_PIC_B, 0x1);
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}
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static void mask_irqs(void)
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{
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outb(MASTER_PIC_B, IRQ2_PIN | IRQ3_PIN | IRQ4_PIN | IRQ5_PIN | IRQ6_PIN
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| IRQ7_PIN);
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outb(SLAVE_PIC_B, 0xff);
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}
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void init_pic(void)
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{
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send_icw1();
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send_icw2();
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send_icw3();
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send_icw4();
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mask_irqs();
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init_keyboard();
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asm volatile("sti");
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}
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void acknowledge(uint32_t int_vector)
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{
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uint8_t ocw2 = 0x20;
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if (int_vector >= IDT_RESERVED_ENTRIES + 8)
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outb(SLAVE_PIC_A, ocw2);
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outb(MASTER_PIC_A, ocw2);
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}
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