Handle ps2 keyboard, no APIC for now

kernel/drivers/ps2kb/ps2kb.c

@@ -0,0 +1,19 @@
+#include <stdint.h>
+#include "ps2kb.h"
+#include "hal/hal.h"
+#include "kprintf.h"
+
+void ps2kb_write(uint8_t val) {
+  while (io_in8(0x64) & 2);
+  io_out8(0x64, val);
+}
+
+uint8_t ps2kb_read(void) {
+  while (!(io_in8(0x64) & 1));
+  return io_in8(0x60);
+}
+
+void ps2kb_intr(void) {
+  uint8_t scancode = ps2kb_read();
+  kprintf("%02x\n", scancode);
+}

kernel/drivers/ps2kb/ps2kb.h

@@ -0,0 +1,10 @@
+#ifndef DRIVERS_PS2KB_H_
+#define DRIVERS_PS2KB_H_
+
+#include <stdint.h>
+
+void ps2kb_write(uint8_t val);
+uint8_t ps2kb_read(void);
+void ps2kb_intr(void);
+
+#endif // DRIVERS_PS2KB_H_