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#!/bin/bash

echo 'Starting.'

nasm -f bin boot.asm -o boot.bin
nasm -f bin stage2.asm -o stage2.bin

dd if=boot.bin of=loader.img bs=512 count=1
dd if=stage2.bin of=loader.img bs=512 count=7 seek=1
dd if=asd.txt of=loader.img bs=512 count=1 seek=7

rm boot.bin
rm stage2.bin

echo 'OK!'
qemu-system-x86_64 -fda loader.img

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Helloooo

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; initialize the environment
mov ax, 0x07c0
mov ds, ax

; the segment of the stage2
mov ax, 0x07e0


mov ch, 0x00
mov cl, 0x02
mov dh, 0x00
mov dl, 0x00

mov es, ax      
mov bx, 0x0000


read:
  mov al, 0x07
  mov ah, 0x02
  int 0x13        
  jc read         

mov ax, 0x07e0
mov ds, ax
mov es, ax
mov fs, ax
mov gs, ax
mov ss, ax

jmp 0x07e0:0x0000

times 510 - ($ - $$) db 0
dw 0xaa55

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start:
	mov ax, 0x7e00
	mov ss, ax
	mov sp, 0x2000
	

	mov al, 0x03
	mov ah, 0x00
	int 0x10 

	call clearScreen

	push 0x0000
	call moveCursor
	add sp, 0x2

	push INTRO
	call print
	add sp, 0x2

	mov ah, 0x0
	int 0x16

	call clearScreen

	push 0x0000
	call moveCursor
	add sp, 0x2

	push HEADER
	call print
	add sp, 0x2

	call checkDisk
	call readInput
	
;	cli
;	hlt

checkDisk:
	pusha

	mov ah, 0x2
	mov al, 0x1
	mov cl, 0x8
	mov ch, 0x0
	mov dh, 0x0
	mov dl, 0x0
	int 0x13

	jc diskError

	push bx
	call print
	
	popa
	ret

diskError:
	pusha

	push DISK_ERROR
	call print

	popa
	ret

clearScreen:
	push bp
	mov bp, sp
	pusha

	mov ah, 0x7
	mov al, 0x0
	mov bh, 0x4
	mov cx, 0x0
	mov dh, 0x18
	mov dl, 0x4F
	int 0x10

	popa
	mov sp, bp
	pop bp
	ret

moveCursor:
	push bp
	mov bp, sp
	pusha

	mov dx, [bp+4]
	mov ah, 0x2
	mov bh, 0x0
	int 0x10

	popa
	mov sp, bp
	pop bp
	ret

print:
	push bp
	mov bp, sp
	pusha
	mov si, [bp+4]
	mov bh, 0x0
	mov bl, 0x0
	mov ah, 0x0e
 .char:
	mov al, [si]
	add si, 1
	or al, 0x0
	je .return
	int 0x10
	jmp .char
 .return:
	popa
	mov sp, bp
	pop bp
	ret

readInput:
	xor ax,ax

readInputLoop:
	xor ax,ax
	int 0x16
;	cmp al, 0x8  ; Backspace
;	je backSpace
	cmp al, 0x0D ; Enter
	je readInputEnd
	call putChar
	mov BYTE [es:KEY_OFFSET + bx], al
	inc bl
	cmp bl, KEY_SIZE
	jne readInputLoop

readInputEnd:


;backSpace:
	
	

putChar:
	push bx
	mov ah, 0x0e
        xor bx, bx
        int 0x10
	pop bx
	ret
	


DISK_ERROR:	db 'Disk read error', 0x0
DISK_ERROR1:	db 'Disk write error', 0x0
SECTORS_ERROR: db "Incorrect number of sectors read", 0

INTRO:	db '', 0xA, 0xD
		db '', 0xA, 0xD
		db '', 0xA, 0xD
		db '', 0xA, 0xD
		db '', 0xA, 0xD
		db '', 0xA, 0xD
		db '', 0xA, 0xD
		db '', 0xA, 0xD
		db '', 0xA, 0xD
		db '', 0xA, 0xD
		db '', 0xA, 0xD
		db '', 0xA, 0xD
		db '', 0xA, 0xD
		db '', 0xA, 0xD
		db '', 0xA, 0xD
		db '', 0xA, 0xD
		db '', 0xA, 0xD
		db '', 0xA, 0xD
		db '', 0xA, 0xD
		db '', 0xA, 0xD
		db '', 0xA, 0xD
		db '', 0xA, 0xD
		db '', 0xA, 0xD
		db '', 0xA, 0xD
		db '', 0xA, 0xD
		db '', 0xA, 0xD
		db 'Press any key...', 0x0


HEADER:	db 'Simple Bootloader', 0xA, 0xD, 0xA, 0xD, 'jkljkl', 0xA, 0xD, 0xA, 0xD, 'kjljkl', 0xA, 0xD, 0xA, 0xD, 'jkl', 0xA, 0xD, 0xA, 0xD, 'jkljkl', 0xA, 0xD, 0xA, 0xD, 'jkljkl', 0xA, 0xD, 0xA, 0xD, 'jkljkl', 0xA, 0xD, 'asdasd', 0xA, 0xD, 0xA, 0xD, 'asdasd', 0xA, 0xD, 0xA, 0xD, 'asd', 0x0

KEY_OFFSET 	equ 0x500
KEY_SIZE 	     equ 0x50


times 3584 - ($ - $$) db 0x0