108 lines
2.2 KiB
C
108 lines
2.2 KiB
C
/* vim: tabstop=4 shiftwidth=4 noexpandtab
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*
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* Interrupt Requests
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*
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*/
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#include <system.h>
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#include <logging.h>
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extern void _irq0(void);
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extern void _irq1(void);
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extern void _irq2(void);
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extern void _irq3(void);
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extern void _irq4(void);
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extern void _irq5(void);
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extern void _irq6(void);
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extern void _irq7(void);
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extern void _irq8(void);
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extern void _irq9(void);
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extern void _irq10(void);
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extern void _irq11(void);
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extern void _irq12(void);
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extern void _irq13(void);
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extern void _irq14(void);
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extern void _irq15(void);
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static irq_handler_t irq_routines[16] = { NULL };
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/*
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* Install an interupt handler for a hardware device.
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*/
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void irq_install_handler(size_t irq, irq_handler_t handler) {
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irq_routines[irq] = handler;
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}
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/*
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* Remove an interrupt handler for a hardware device.
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*/
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void irq_uninstall_handler(size_t irq) {
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irq_routines[irq] = 0;
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}
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/*
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* Remap interrupt handlers
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*/
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void irq_remap(void) {
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outportb(0x20, 0x11);
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outportb(0xA0, 0x11);
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outportb(0x21, 0x20);
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outportb(0xA1, 0x28);
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outportb(0x21, 0x04);
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outportb(0xA1, 0x02);
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outportb(0x21, 0x01);
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outportb(0xA1, 0x01);
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outportb(0x21, 0x0);
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outportb(0xA1, 0x0);
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}
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void irq_gates(void) {
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idt_set_gate(32, _irq0, 0x08, 0x8E);
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idt_set_gate(33, _irq1, 0x08, 0x8E);
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idt_set_gate(34, _irq2, 0x08, 0x8E);
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idt_set_gate(35, _irq3, 0x08, 0x8E);
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idt_set_gate(36, _irq4, 0x08, 0x8E);
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idt_set_gate(37, _irq5, 0x08, 0x8E);
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idt_set_gate(38, _irq6, 0x08, 0x8E);
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idt_set_gate(39, _irq7, 0x08, 0x8E);
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idt_set_gate(40, _irq8, 0x08, 0x8E);
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idt_set_gate(41, _irq9, 0x08, 0x8E);
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idt_set_gate(42, _irq10, 0x08, 0x8E);
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idt_set_gate(43, _irq11, 0x08, 0x8E);
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idt_set_gate(44, _irq12, 0x08, 0x8E);
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idt_set_gate(45, _irq13, 0x08, 0x8E);
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idt_set_gate(46, _irq14, 0x08, 0x8E);
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idt_set_gate(47, _irq15, 0x08, 0x8E);
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}
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/*
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* Set up interrupt handler for hardware devices.
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*/
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void irq_install(void) {
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irq_remap();
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irq_gates();
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IRQ_RES;
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}
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void irq_ack(size_t irq_no) {
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if (irq_no >= 8) {
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outportb(0xA0, 0x20);
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}
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outportb(0x20, 0x20);
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}
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void irq_handler(struct regs *r) {
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IRQ_OFF;
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void (*handler)(struct regs *r);
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if (r->int_no > 47 || r->int_no < 32) {
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handler = NULL;
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} else {
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handler = irq_routines[r->int_no - 32];
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}
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if (handler) {
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handler(r);
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} else {
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irq_ack(r->int_no - 32);
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}
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IRQ_RES;
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}
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