Addded IRQ Handling!!!

src/kernel/irq.c

@@ -0,0 +1,61 @@
+#include "irq.h"
+#include "stdint.h"
+#include "system.h"
+
+void* irqRoutines[16] = { 0 };
+
+void installIrqHandler(uint32_t irq, void (*handler)(struct regs* r)) {
+    irqRoutines[irq] = handler;
+}
+
+void uninstallIrqHandler(uint32_t irq) {
+    irqRoutines[irq] = 0;
+}
+
+// I have no clue how or what this does, but it makes everything work
+void irqRemap(void) {
+    outb(0xA0, 0x11);
+    outb(0x20, 0x11);
+    outb(0x21, 0x20);
+    outb(0xA1, 0x28);
+    outb(0x21, 0x04);
+    outb(0xA1, 0x02);
+    outb(0x21, 0x01);
+    outb(0xA1, 0x01);
+    outb(0x21, 0x0);
+    outb(0xA1, 0x0);
+}
+
+void irqHandler(struct regs* r) {
+    void (*handler)(struct regs* r);
+
+    handler = irqRoutines[r->intNo - 32]; // Offset by 32 because of isrs
+    if (handler) handler(r);
+
+    // Something about master and slave handlers
+    if (r->intNo >= 40) outb(0xa0, 0x20);
+    outb(0x20, 0x20);
+}
+
+void setupIrqs() {
+    irqRemap();
+
+    // Same as isrs, but differnet handlers :o
+    idtSetGate(32, (unsigned)irq0, 0x08, 0x8e);
+    idtSetGate(33, (unsigned)irq1, 0x08, 0x8e);
+    idtSetGate(34, (unsigned)irq2, 0x08, 0x8e);
+    idtSetGate(35, (unsigned)irq3, 0x08, 0x8e);
+    idtSetGate(36, (unsigned)irq4, 0x08, 0x8e);
+    idtSetGate(37, (unsigned)irq5, 0x08, 0x8e);
+    idtSetGate(38, (unsigned)irq6, 0x08, 0x8e);
+    idtSetGate(39, (unsigned)irq7, 0x08, 0x8e);
+    idtSetGate(40, (unsigned)irq8, 0x08, 0x8e);
+    idtSetGate(41, (unsigned)irq9, 0x08, 0x8e);
+    idtSetGate(42, (unsigned)irq10, 0x08, 0x8e);
+    idtSetGate(43, (unsigned)irq11, 0x08, 0x8e);
+    idtSetGate(44, (unsigned)irq12, 0x08, 0x8e);
+    idtSetGate(45, (unsigned)irq13, 0x08, 0x8e);
+    idtSetGate(46, (unsigned)irq14, 0x08, 0x8e);
+    idtSetGate(47, (unsigned)irq15, 0x08, 0x8e);
+}
+