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https://github.com/cfenollosa/os-tutorial.git
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154 lines
4.1 KiB
C
154 lines
4.1 KiB
C
#include "isr.h"
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#include "idt.h"
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#include "../drivers/screen.h"
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#include "../drivers/keyboard.h"
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#include "../libc/string.h"
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#include "timer.h"
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#include "ports.h"
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isr_t interrupt_handlers[256];
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/* Can't do this with a loop because we need the address
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* of the function names */
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void isr_install() {
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set_idt_gate(0, (uint32_t)isr0);
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set_idt_gate(1, (uint32_t)isr1);
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set_idt_gate(2, (uint32_t)isr2);
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set_idt_gate(3, (uint32_t)isr3);
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set_idt_gate(4, (uint32_t)isr4);
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set_idt_gate(5, (uint32_t)isr5);
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set_idt_gate(6, (uint32_t)isr6);
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set_idt_gate(7, (uint32_t)isr7);
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set_idt_gate(8, (uint32_t)isr8);
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set_idt_gate(9, (uint32_t)isr9);
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set_idt_gate(10, (uint32_t)isr10);
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set_idt_gate(11, (uint32_t)isr11);
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set_idt_gate(12, (uint32_t)isr12);
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set_idt_gate(13, (uint32_t)isr13);
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set_idt_gate(14, (uint32_t)isr14);
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set_idt_gate(15, (uint32_t)isr15);
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set_idt_gate(16, (uint32_t)isr16);
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set_idt_gate(17, (uint32_t)isr17);
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set_idt_gate(18, (uint32_t)isr18);
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set_idt_gate(19, (uint32_t)isr19);
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set_idt_gate(20, (uint32_t)isr20);
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set_idt_gate(21, (uint32_t)isr21);
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set_idt_gate(22, (uint32_t)isr22);
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set_idt_gate(23, (uint32_t)isr23);
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set_idt_gate(24, (uint32_t)isr24);
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set_idt_gate(25, (uint32_t)isr25);
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set_idt_gate(26, (uint32_t)isr26);
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set_idt_gate(27, (uint32_t)isr27);
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set_idt_gate(28, (uint32_t)isr28);
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set_idt_gate(29, (uint32_t)isr29);
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set_idt_gate(30, (uint32_t)isr30);
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set_idt_gate(31, (uint32_t)isr31);
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// Remap the PIC
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port_byte_out(0x20, 0x11);
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port_byte_out(0xA0, 0x11);
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port_byte_out(0x21, 0x20);
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port_byte_out(0xA1, 0x28);
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port_byte_out(0x21, 0x04);
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port_byte_out(0xA1, 0x02);
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port_byte_out(0x21, 0x01);
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port_byte_out(0xA1, 0x01);
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port_byte_out(0x21, 0x0);
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port_byte_out(0xA1, 0x0);
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// Install the IRQs
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set_idt_gate(32, (uint32_t)irq0);
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set_idt_gate(33, (uint32_t)irq1);
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set_idt_gate(34, (uint32_t)irq2);
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set_idt_gate(35, (uint32_t)irq3);
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set_idt_gate(36, (uint32_t)irq4);
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set_idt_gate(37, (uint32_t)irq5);
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set_idt_gate(38, (uint32_t)irq6);
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set_idt_gate(39, (uint32_t)irq7);
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set_idt_gate(40, (uint32_t)irq8);
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set_idt_gate(41, (uint32_t)irq9);
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set_idt_gate(42, (uint32_t)irq10);
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set_idt_gate(43, (uint32_t)irq11);
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set_idt_gate(44, (uint32_t)irq12);
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set_idt_gate(45, (uint32_t)irq13);
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set_idt_gate(46, (uint32_t)irq14);
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set_idt_gate(47, (uint32_t)irq15);
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set_idt(); // Load with ASM
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}
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/* To print the message which defines every exception */
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char *exception_messages[] = {
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"Division By Zero",
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"Debug",
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"Non Maskable Interrupt",
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"Breakpoint",
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"Into Detected Overflow",
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"Out of Bounds",
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"Invalid Opcode",
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"No Coprocessor",
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"Double Fault",
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"Coprocessor Segment Overrun",
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"Bad TSS",
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"Segment Not Present",
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"Stack Fault",
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"General Protection Fault",
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"Page Fault",
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"Unknown Interrupt",
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"Coprocessor Fault",
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"Alignment Check",
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"Machine Check",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved"
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};
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void isr_handler(registers_t r) {
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kprint("received interrupt: ");
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char s[3];
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int_to_ascii(r.int_no, s);
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kprint(s);
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kprint("\n");
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kprint(exception_messages[r.int_no]);
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kprint("\n");
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}
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void register_interrupt_handler(uint8_t n, isr_t handler) {
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interrupt_handlers[n] = handler;
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}
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void irq_handler(registers_t r) {
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/* After every interrupt we need to send an EOI to the PICs
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* or they will not send another interrupt again */
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if (r.int_no >= 40) port_byte_out(0xA0, 0x20); /* slave */
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port_byte_out(0x20, 0x20); /* master */
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/* Handle the interrupt in a more modular way */
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if (interrupt_handlers[r.int_no] != 0) {
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isr_t handler = interrupt_handlers[r.int_no];
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handler(r);
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}
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}
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void irq_install() {
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/* Enable interruptions */
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asm volatile("sti");
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/* IRQ0: timer */
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init_timer(50);
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/* IRQ1: keyboard */
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init_keyboard();
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}
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