[keyb] Keyboard support of sorts

Makefile

@@ -7,7 +7,7 @@ install: kernel
 	cp kernel /mnt/kernel
 	umount /mnt
 
-kernel: start.o link.ld main.o vga.o gdt.o idt.o isrs.o irq.o timer.o
+kernel: start.o link.ld main.o vga.o gdt.o idt.o isrs.o irq.o timer.o kbd.o
 	ld -m elf_i386 -T link.ld -o kernel *.o
 
 %.o: %.c

include/system.h

@@ -45,4 +45,8 @@ extern void timer_install();
 extern int timer_ticks;
 extern void timer_wait(int ticks);
 
+/* Keyboard */
+extern void keyboard_install();
+extern void keyboard_wait();
+
 #endif

kbd.c

@@ -0,0 +1,64 @@
+#include <system.h>
+
+char kbd_us[128] = {
+	0, 27,
+	'1','2','3','4','5','6','7','8','9','0',
+	'-','=','\b',
+	'\t', /* tab */
+	'q','w','e','r','t','y','u','i','o','p','[',']','\n',
+	0, /* control */
+	'a','s','d','f','g','h','j','k','l',';','\'', '`',
+	0, /* left shift */
+	'\\','z','x','c','v','b','n','m',',','.','/',
+	0, /* right shift */
+	'*',
+	0, /* alt */
+	' ', /* space */
+	0, /* caps lock */
+	0, /* F1 [59] */
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, /* ... F10 */
+	0, /* 69 num lock */
+	0, /* scroll lock */
+	0, /* home */
+	0, /* up */
+	0, /* page up */
+	'-',
+	0, /* left arrow */
+	0,
+	0, /* right arrow */
+	'+',
+	0, /* 79 end */
+	0, /* down */
+	0, /* page down */
+	0, /* insert */
+	0, /* delete */
+	0, 0, 0,
+	0, /* F11 */
+	0, /* F12 */
+	0, /* everything else */
+};
+
+void
+keyboard_handler(
+		struct regs *r
+		) {
+	unsigned char scancode;
+	scancode = inportb(0x60);
+	if (scancode & 0x80) {
+		/* key up */
+	} else {
+		putch(kbd_us[scancode]);
+	}
+}
+
+void
+keyboard_install() {
+	/* IRQ installer */
+	irq_install_handler(1, keyboard_handler);
+}
+
+void
+keyboard_wait() {
+	while(inportb(0x64) & 2);
+}

main.c

@@ -152,6 +152,7 @@ main() {
 	irq_install();
 	__asm__ __volatile__("sti");
 	timer_install();
+	keyboard_install();
 	init_video();
 	puts("Good Morning!\n");
 	beer();