117 lines
3.1 KiB
C
117 lines
3.1 KiB
C
#include "../include/description_table.h"
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#include "../include/memory.h"
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#include "../include/io.h"
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#include "../include/isr.h"
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#include "../include/vga.h"
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static isr_t interrupt_handlers[256];
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idt_entry_t idt_entries[256]; // IDT有256个描述符
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idt_ptr_t idt_ptr;
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extern void idt_flush(uint32_t);
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static void idt_set_gate(uint8_t num, uint32_t base, uint16_t sel, uint8_t flags) {
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idt_entries[num].base_low = base & 0xFFFF;
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idt_entries[num].base_high = (base >> 16) & 0xFFFF; // 拆成低位和高位
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idt_entries[num].sel = sel;
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idt_entries[num].always0 = 0;
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idt_entries[num].flags = flags;
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// flags | 0x60，即可被Ring3调用
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}
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void isr_handler(registers_t regs) {
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printf("\n[Kernel]: received interrupt: %d",regs.int_no);
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if (interrupt_handlers[regs.int_no]) {
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isr_t handler = interrupt_handlers[regs.int_no]; // 有自定义处理程序，调用之
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handler(®s); // 传入寄存器
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}
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}
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void irq_handler(registers_t regs) {
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if (regs.int_no >= 40) outb(0xA0, 0x20); // 中断号 >= 40，来自从片，发送EOI给从片
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outb(0x20, 0x20); // 发送EOI给主片
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if (interrupt_handlers[regs.int_no]) {
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isr_t handler = interrupt_handlers[regs.int_no]; // 有自定义处理程序，调用之
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handler(®s); // 传入寄存器
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}
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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 idt_install() {
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idt_ptr.limit = sizeof(idt_entry_t) * 256 - 1;
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idt_ptr.base = (uint32_t) & idt_entries;
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memset(&idt_entries, 0, sizeof(idt_entry_t) * 256);
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outb(0x20, 0x11);
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outb(0xA0, 0x11);
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outb(0x21, 0x20);
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outb(0xA1, 0x28);
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outb(0x21, 0x04);
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outb(0xA1, 0x02);
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outb(0x21, 0x01);
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outb(0xA1, 0x01);
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outb(0x21, 0x0);
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outb(0xA1, 0x0);
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#define REGISTER_ISR(id) idt_set_gate(id, (uint32_t) isr##id, 0x08, 0x8E)
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REGISTER_ISR(0);
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REGISTER_ISR(1);
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REGISTER_ISR(2);
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REGISTER_ISR(3);
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REGISTER_ISR(4);
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REGISTER_ISR(5);
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REGISTER_ISR(6);
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REGISTER_ISR(7);
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REGISTER_ISR(8);
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REGISTER_ISR(9);
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REGISTER_ISR(10);
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REGISTER_ISR(11);
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REGISTER_ISR(12);
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REGISTER_ISR(13);
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REGISTER_ISR(14);
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REGISTER_ISR(15);
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REGISTER_ISR(16);
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REGISTER_ISR(17);
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REGISTER_ISR(18);
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REGISTER_ISR(19);
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REGISTER_ISR(20);
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REGISTER_ISR(21);
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REGISTER_ISR(22);
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REGISTER_ISR(23);
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REGISTER_ISR(24);
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REGISTER_ISR(25);
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REGISTER_ISR(26);
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REGISTER_ISR(27);
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REGISTER_ISR(28);
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REGISTER_ISR(29);
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REGISTER_ISR(30);
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REGISTER_ISR(31);
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#undef REGISTER_ISR
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#define REGISTER_IRQ(id, irq_id) idt_set_gate(id, (uint32_t) irq##irq_id, 0x08, 0x8E)
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REGISTER_IRQ(32, 0);
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REGISTER_IRQ(33, 1);
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REGISTER_IRQ(34, 2);
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REGISTER_IRQ(35, 3);
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REGISTER_IRQ(36, 4);
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REGISTER_IRQ(37, 5);
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REGISTER_IRQ(38, 6);
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REGISTER_IRQ(39, 7);
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REGISTER_IRQ(40, 8);
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REGISTER_IRQ(41, 9);
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REGISTER_IRQ(42, 10);
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REGISTER_IRQ(43, 11);
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REGISTER_IRQ(44, 12);
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REGISTER_IRQ(45, 13);
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REGISTER_IRQ(46, 14);
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REGISTER_IRQ(47, 15);
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#undef REGISTER_IRQ
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idt_flush((uint32_t) & idt_ptr);
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} |