Add basic keyboard support

Makefile

@@ -1,4 +1,4 @@
-OBJECTS = start.o scrn.o gdt.o idt.o isrs.o irq.o timer.o main.o
+OBJECTS = start.o scrn.o gdt.o idt.o isrs.o irq.o timer.o kb.o main.o
 CC = gcc
 CFLAGS = -m32 -nostdlib -nostdinc -fno-builtin -fno-stack-protector -nostartfiles -nodefaultlibs -Wall -O -fstrength-reduce -fomit-frame-pointer -finline-functions -I./include -c
 LDFLAGS = -T link.ld -melf_i386

include/system.h

@@ -33,4 +33,6 @@ void irq_install();
 
 void timer_install();
 
+void keyborad_install();
+
 #endif

kb.c

@@ -0,0 +1,63 @@
+#include <system.h>
+
+unsigned char kbdus[128] =
+{
+    0,  27, '1', '2', '3', '4', '5', '6', '7', '8',	/* 9 */
+  '9', '0', '-', '=', '\b',	/* Backspace */
+  '\t',			/* Tab */
+  'q', 'w', 'e', 'r',	/* 19 */
+  't', 'y', 'u', 'i', 'o', 'p', '[', ']', '\n',	/* Enter key */
+    0,			/* 29   - Control */
+  'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';',	/* 39 */
+ '\'', '`',   0,		/* Left shift */
+ '\\', 'z', 'x', 'c', 'v', 'b', 'n',			/* 49 */
+  'm', ',', '.', '/',   0,				/* Right shift */
+  '*',
+    0,	/* Alt */
+  ' ',	/* Space bar */
+    0,	/* Caps lock */
+    0,	/* 59 - F1 key ... > */
+    0,   0,   0,   0,   0,   0,   0,   0,
+    0,	/* < ... F10 */
+    0,	/* 69 - Num lock*/
+    0,	/* Scroll Lock */
+    0,	/* Home key */
+    0,	/* Up Arrow */
+    0,	/* Page Up */
+  '-',
+    0,	/* Left Arrow */
+    0,
+    0,	/* Right Arrow */
+  '+',
+    0,	/* 79 - End key*/
+    0,	/* Down Arrow */
+    0,	/* Page Down */
+    0,	/* Insert Key */
+    0,	/* Delete Key */
+    0,   0,   0,
+    0,	/* F11 Key */
+    0,	/* F12 Key */
+    0,	/* All other keys are undefined */
+};
+
+void keyboard_handler(struct regs *r)
+{
+    unsigned char scancode;
+
+    scancode = inportb(0x60);
+
+    if (scancode & 0x80)
+    {
+
+    }
+    else
+    {
+        putch(kbdus[scancode]);
+    }
+
+}
+
+void keyborad_install(void)
+{
+    irq_install_handler(1, keyboard_handler);
+}

main.c

@@ -59,6 +59,7 @@ void main()
     isrs_install();
     irq_install();
     timer_install();
+    keyborad_install();
     init_video();
     __asm__ __volatile__("sti");
     puts("System Start!\n");