PIC

kernel/io.c

@@ -24,3 +24,6 @@ unsigned short port_inw(unsigned short port) {
 void port_outw(unsigned short port, unsigned short data) {
 	__asm__("out %%ax, %%dx" : :"a" (data), "d" (port));
 }
+
+
+static inline void io_wait() { port_outb(0x80, 0); }

kernel/io.h

@@ -3,3 +3,5 @@ void port_outb();
 
 unsigned short port_inw();
 void port_outw();
+
+static inline void io_wait();

kernel/pic.c

@@ -0,0 +1,8 @@
+#include "pic.h"
+
+void PIC_sendEOI(uint8 irq) {
+	if( irq >= 8 ) 
+		port_outb(PIC2_CMD, PIC_EOI);
+	port_outb(PIC1_CMD, PIC_EOI);
+}
+

kernel/pic.h

@@ -0,0 +1,30 @@
+#include "../lib/types.h"
+#include "io.h"
+
+// master
+#define PIC1		0x20
+#define PIC1_CMD	PIC1
+#define PIC1_DATA	(PIC1+1)
+
+// slave
+#define PIC2		0xa0
+#define PIC2_CMD	PIC2
+#define PIC2_DATA	(PIC2+1)
+
+#define ICW1_ICW4		0x01
+#define ICW1_SINGLE		0x02
+#define ICW1_INTERVAL4	0x04
+#define ICW1_LEVEL		0x08
+#define ICW1_INIT		0x10
+ 
+#define ICW4_8086		0x01	
+#define ICW4_AUTO		0x02	
+#define ICW4_BUF_SLAVE	0x08	
+#define ICW4_BUF_MASTER	0x0C	
+#define ICW4_SFNM		0x10	
+
+// Ints
+#define PIC_EOI	0x20 // End-of-interupt
+
+void PIC_sendEOI(uint8);
+void PIC_remap(uint, uint);