feat(pic): add remapping of pic

k/pic.c

@@ -0,0 +1,24 @@
+#include "pic.h"
+#include "io.h"
+
+void remap_pic(void)
+{
+    // ICW1
+    outb(MASTER_PORT_A, ICW1_INIT | ICW1_ICW4);
+    outb(SLAVE_PORT_A, ICW1_INIT | ICW1_ICW4);
+
+    // ICW2
+    outb(MASTER_PORT_B, ICW2_M_OFFSET);
+    outb(SLAVE_PORT_B, ICW2_S_OFFSET);
+
+    // ICW3
+    outb(MASTER_PORT_B, PIC_PIN_2);
+    outb(SLAVE_PORT_B, 2);
+
+    // ICW4
+    outb(MASTER_PORT_B, ICW4_INIT);
+    outb(SLAVE_PORT_B, ICW4_INIT);
+
+    // OCW1
+    outb(MASTER_PORT_B, PIC_PIN_0); // masking PIT for now
+}

k/pic.h

@@ -0,0 +1,41 @@
+#ifndef PIC_H
+#define PIC_H
+
+#define MASTER_PORT_A   0x20
+#define MASTER_PORT_B   0x21
+#define SLAVE_PORT_A    0xa0
+#define SLAVE_PORT_B    0xa1
+
+// ICW1
+#define ICW1_ICW4   0x1
+#define ICW1_SINGLE 0x2
+#define ICW_LT      0x8
+#define ICW1_INIT   0x10
+
+// ICW2
+#define ICW2_M_OFFSET   0x20
+#define ICW2_S_OFFSET   0x28
+
+// ICW3 / OCW1
+#define PIC_PIN_0  0x1
+#define PIC_PIN_1  0x2
+#define PIC_PIN_2  0x4
+#define PIC_PIN_3  0x8
+#define PIC_PIN_4  0x10
+#define PIC_PIN_5  0x20
+#define PIC_PIN_6  0x40
+#define PIC_PIN_7  0x80
+
+// ICW4
+#define ICW4_INIT       0x1
+#define ICW4_AUTO_EOI   0x2
+#define ICW4_NESTED     0x10
+
+// OCW2
+#define OCW2_EOI    0x20
+#define OCW2_SPEC   0x40
+#define OCW2_ROT    0x80
+
+void remap_pic(void);
+
+#endif  /* !PIC_H */