92 lines
2.7 KiB
C
92 lines
2.7 KiB
C
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#include <stdio.h>
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#include "pic.h"
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#include "irq.h"
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#include "idt.h"
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/* These are own ISRs that point to our special IRQ handler
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* instead of the regular 'fault_handler' function */
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extern void Irq_0();
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extern void Irq_1();
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extern void Irq_2();
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extern void Irq_3();
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extern void Irq_4();
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extern void Irq_5();
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extern void Irq_6();
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extern void Irq_7();
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extern void Irq_8();
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extern void Irq_9();
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extern void Irq_10();
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extern void Irq_11();
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extern void Irq_12();
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extern void Irq_13();
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extern void Irq_14();
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extern void Irq_15();
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/* This array is actually an array of function pointers. We use
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* this to handle custom IRQ handlers for a given IRQ */
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void *IrqRoutines[16] =
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{
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0
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};
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/* This installs a custom IRQ handler for the given IRQ */
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void IrqInstallHandler (int irq, void (*handler)(_RegsStack32 *r))
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{
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IrqRoutines[irq] = handler;
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}
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void IrqUninstallHandler (int irq)
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{
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IrqRoutines[irq] = 0;
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}
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/* We first remap the interrupt controllers, and then we install
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* the appropriate ISRs to the correct entries in the IDT. This
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* is just like installing the exception handlers */
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void IrqInstall()
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{
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PicRemap(32,40);
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IdtSetGate(32, (unsigned)Irq_0, 0x08, 0x8E);
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IdtSetGate(33, (unsigned)Irq_1, 0x08, 0x8E);
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IdtSetGate(34, (unsigned)Irq_2, 0x08, 0x8E);
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IdtSetGate(35, (unsigned)Irq_3, 0x08, 0x8E);
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IdtSetGate(36, (unsigned)Irq_4, 0x08, 0x8E);
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IdtSetGate(37, (unsigned)Irq_5, 0x08, 0x8E);
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IdtSetGate(38, (unsigned)Irq_6, 0x08, 0x8E);
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IdtSetGate(39, (unsigned)Irq_7, 0x08, 0x8E);
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IdtSetGate(40, (unsigned)Irq_8, 0x08, 0x8E);
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IdtSetGate(41, (unsigned)Irq_9, 0x08, 0x8E);
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IdtSetGate(42, (unsigned)Irq_10, 0x08, 0x8E);
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IdtSetGate(43, (unsigned)Irq_11, 0x08, 0x8E);
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IdtSetGate(44, (unsigned)Irq_12, 0x08, 0x8E);
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IdtSetGate(45, (unsigned)Irq_13, 0x08, 0x8E);
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IdtSetGate(46, (unsigned)Irq_14, 0x08, 0x8E);
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IdtSetGate(47, (unsigned)Irq_15, 0x08, 0x8E);
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}
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// Default IRQ handler, launches other handler if installed.
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// Also sends end-of-interrupt messages to PIC
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void IrqHandler (_RegsStack32 *r)
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{
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/* This is a blank function pointer */
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void (*handler)(_RegsStack32 *r);
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/* Find out if we have a custom handler to run for this
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* IRQ, and then finally, run it */
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handler = IrqRoutines[r->int_no - 32];
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if (handler) handler(r);
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/* If the IDT entry that was invoked was greater than 40
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* (meaning IRQ8 - 15), then we need to send an EOI to
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* the slave controller */
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if (r->int_no >=40) outportb(0xA0, 0x20);
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/* In either case, we need to send an EOI to the master
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* interrupt controller too */
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outportb(0x20, 0x20);
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}
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