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|
; $Id: bootsect.S,v 1.2 2009-01-28 16:47:17 potyra Exp $
;
; Copyright (C) 2004-2009 FAUmachine Team <info@faumachine.org>.
; This program is free software. You can redistribute it and/or modify it
; under the terms of the GNU General Public License, either version 2 of
; the License, or (at your option) any later version. See COPYING.
.code16
.text
.global _start
_start:
/* Switch to vga mode 3. */
movb $3, %al
movb $0x00, %ah
int $0x10
/* Get values of all palette registers. */
movw $0, %cx
loop_palette:
pushw %cx
movb %cl, %bl
movw $0x1007, %ax
int $0x10
movb %bh, %al
call hex
call space
popw %cx
incw %cx
cmpw $0x10, %cx
jne loop_palette
movb $'\n', %al
movb $0x0e, %ah
int $0x10
movb $'\r', %al
movb $0x0e, %ah
int $0x10
/* Get values of all color registers. */
movw $0, %cx
loop_dac:
pushw %cx
movb %cl, %bl
movw $0x1015, %ax
int $0x10
pushw %cx
pushw %dx
movb %dh, %al
call hex
call space
popw %dx
popw %cx
pushw %cx
pushw %dx
movb %ch, %al
call hex
call space
popw %dx
popw %cx
pushw %cx
pushw %dx
movb %cl, %al
call hex
call space
popw %dx
popw %cx
call space
popw %cx
inc %cx
cmpw $64, %cx
jne loop_dac
movb $'\n', %al
movb $0x0e, %ah
int $0x10
movb $'\r', %al
movb $0x0e, %ah
int $0x10
movb $'d', %al
movb $0x0e, %ah
int $0x10
movb $'o', %al
movb $0x0e, %ah
int $0x10
movb $'n', %al
movb $0x0e, %ah
int $0x10
movb $'e', %al
movb $0x0e, %ah
int $0x10
loop:
jmp loop
space:
pushw %ax
movb $' ', %al
movb $0x0e, %ah
int $0x10
popw %ax
ret
hex:
pushw %ax
shrb $4, %al
andb $0x0f, %al
call digit
popw %ax
pushw %ax
andb $0x0f, %al
call digit
popw %ax
ret
digit:
pushw %ax
cmpb $10, %al
jge 1f
addb $'0', %al
jmp 2f
1: addb $'A'-10, %al
2: movb $0x0e, %ah
int $0x10
popw %ax
ret
.org 510
.word 0xAA55
|
