feat(keyboard): add getkey function

k/idt.c

@@ -1,5 +1,8 @@
 #include "idt.h"
 #include "stdio.h"
+#include "pic.h"
+#include "io.h"
+#include "pic/keyboard.h"
 
 static struct idt idt = { 0 };
 
@@ -27,8 +30,22 @@ static struct idt_entry_info infos[] = {
 
 void handle_interrupt(struct int_args *args)
 {
+    if (args->int_code >= 32)
+    {
+        int8_t key = getkey();
+        if (key >= 0)
+        {
+            printf("%d\r\n", key);
+        }
+
+        outb(MASTER_PORT_A, OCW2_EOI);
+
+        return;
+    }
+
     printf("INTERRUPT: %d, error code: %d\r\n", args->int_code, args->err_code);
-    return;
+
+    asm volatile("cli; hlt");
 }
 
 static struct idt_entry create_idt_entry(uint32_t offset,

k/pic/keyboard.c

@@ -0,0 +1,13 @@
+#include "pic/keyboard.h"
+#include "io.h"
+#include "stdio.h"
+
+int8_t getkey(void)
+{
+    uint8_t key = inb(KEYBOARD_IO);
+
+    if (key & KEYBOARD_RELEASE)
+        return -1;
+
+    return key;
+}

k/pic/keyboard.h

@@ -0,0 +1,13 @@
+#ifndef KEYBOARD_H
+#define KEYBOARD_H
+
+#define KEYBOARD_IO     0x60
+#define KEYBOARD_STATUS 0x64
+
+#define KEYBOARD_RELEASE 0x80
+
+#include <stdint.h>
+
+int8_t getkey(void);
+
+#endif /* !KEYBOARD_H */