kmain: put pic mask things into separate function

src/kernel.c

@@ -9,6 +9,13 @@
 
 #include <stdint.h>
 
+void apply_pic_masks()
+{
+	//0x21 is master pic, 0xa1 is slave pic
+	outb(0x21,0xfc);//0b11111100 (bit 0 is PIT, bit 1 is keyboard and so on)
+   	outb(0xa1,0xff);
+}
+
 void kmain()
 {
 	terminal_initialize();
@@ -16,9 +23,8 @@ void kmain()
 	isr_install();
 	pic_remap(0x20, 0x28);
 	pit_init();
-	//only enable keyboard IRQs
-	outb(0x21,0xfc);
-   	outb(0xa1,0xff);
+
+	apply_pic_masks();
 
 	printf("Kernel init sequence completed\n");