Boot.asm

%include "init0.inc"
[org 0]

jmp 07C0h:start

start:
    mov ax, cs
    mov ds, ax
    mov es, ax

fd_reset:
    mov ax, 0
    mov dl, 0
    int 13h
    jc fd_reset

    mov ax, 0xB800
    mov es, ax
    mov di, 0
    mov ax, word [msgBack]
    mov cx, 0x7FF

paint:
    mov word [es:di], ax
    add di, 2
    dec cx
    jnz paint

read:
    mov ax, 0x1000
    mov es, ax
    mov bx, 0
    
    mov ah, 2
	mov al, 1
	mov ch, 0
	mov cl, 2
	mov dh, 0
	mov dl, 0
	int 13h

	jc read

	mov dx, 0x3F2
	xor al, al
	out dx, al

	cli

	mov al, 0x11
	out 0x20, al
	dw 0x00eb, 0x00eb
	out 0xA0, al
	dw 0x00eb, 0x00eb
	
	mov al, 0x20
	out 0x21, al
	dw 0x00eb, 0x00eb
	mov al, 0x28
	out 0xA1, al
	dw 0x00eb, 0x00eb

	mov al, 0x04
	out 0x21, al
	dw 0x00eb, 0x00eb
	mov al, 0x02
	out 0xA1, al
	dw 0x00eb, 0x00eb

	mov al, 0x01
	out 0x21, al
	dw 0x00eb, 0x00eb
	out 0xA1, al
	dw 0x00eb, 0x00eb

	mov al, 0xFF
	out 0xA1, al
	dw 0x00eb, 0x00eb
	mov al, 0xFB
	out 0x21, al

	lgdt[gdtr]

	mov eax, cr0
	or eax, 0x00000001
	mov cr0, eax

	jmp $+2
	nop
	nop

	mov bx, SysDataSelector
	mov ds, bx
	mov es, bx
	mov fs, bx
	mov gs, bx
	mov ss, bx

	jmp dword SysCodeSelector:0x10000

	msgBack db '.', 0x67

gdtr:
	dw gdt_end - gdt - 1
	dd gdt+0x7C00

gdt:
	dd 0, 0
	dd 0x0000FFFF, 0x00CF9A00
	dd 0x0000FFFF, 0x00CF9200
	dd 0x8000FFFF, 0x0040920B

gdt_end:
	times 510-($-$$) db 0
	dw 0AA55h