Kernel: Move i8253.cpp => Arch/i386/PIT.cpp

Kernel/Arch/i386/PIT.h

@@ -0,0 +1,32 @@
+#pragma once
+
+#include <AK/Types.h>
+
+#define TICKS_PER_SECOND 1000
+/* Timer related ports */
+#define TIMER0_CTL 0x40
+#define TIMER1_CTL 0x41
+#define TIMER2_CTL 0x42
+#define PIT_CTL 0x43
+
+/* Building blocks for PIT_CTL */
+#define TIMER0_SELECT 0x00
+#define TIMER1_SELECT 0x40
+#define TIMER2_SELECT 0x80
+
+#define MODE_COUNTDOWN 0x00
+#define MODE_ONESHOT 0x02
+#define MODE_RATE 0x04
+#define MODE_SQUARE_WAVE 0x06
+
+#define WRITE_WORD 0x30
+
+#define BASE_FREQUENCY 1193182
+
+namespace PIT {
+
+void initialize();
+u32 ticks_this_second();
+u32 seconds_since_boot();
+
+}