Added IRQ-support and timer interrupt.

1 files changed, 42 insertions, 0 deletions

diff --git a/kernel/irq.c b/kernel/irq.c
new file mode 100644
index 0000000..6034735
--- /dev/null
+++ b/kernel/irq.c
@@ -0,0 +1,42 @@
+#include "irq.h"
+#include "portio.h"
+
+void irq_init() {
+	// ICW1
+	outb(0x20, 0x11);
+	outb(0xa0, 0x11);
+	
+	// ICW2 - Offset.
+	outb(0x21, 0x20);
+	outb(0xa1, 0x28);
+	
+	// ICW3
+	outb(0x21, 0x04);
+	outb(0xa1, 0x02);
+	
+	// ICW4
+	outb(0x21, 0x01);
+	outb(0xa1, 0x01);
+	
+	// OCW1 - Mask.
+	outb(0x21, 0xfe);
+	outb(0xa1, 0xff);
+	
+	// Initialize timer.
+	// TODO: Move this elsewhere.
+	outb(0x43, 0x36);
+	outb(0x40, 0x00);
+	outb(0x40, 0x00);
+}
+
+void irq_reset() {
+	// OCW2
+	outb(0x20, 0x20);
+}
+
+void irq_reset_slave() {
+	// OCW2
+	outb(0xa0, 0x20);
+	
+	irq_reset();
+}