# Copyright (c) KATO Takenori, 1999, 2000. # # All rights reserved. Unpublished rights reserved under the copyright # laws of Japan. # # Redistribution and use in source and binary forms, with or without # modification, are permitted provided that the following conditions # are met: # # 1. Redistributions of source code must retain the above copyright # notice, this list of conditions and the following disclaimer as # the first lines of this file unmodified. # 2. Redistributions in binary form must reproduce the above copyright # notice, this list of conditions and the following disclaimer in the # documentation and/or other materials provided with the distribution. # 3. The name of the author may not be used to endorse or promote products # derived from this software without specific prior written permission. # # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. # # $FreeBSD: src/sys/boot/pc98/boot0/boot0.s,v 1.1 2000/08/02 08:46:08 kato Exp $ .globl start .code16 start: jmp main .org 4 .ascii "IPL1" .byte 0, 0, 0 .globl start main: xor %ax, %ax mov %ax, %ds mov (0x584), %al # DA/UA mov %al, %ah and $0xf0, %ah cmp $0x90, %ah je fdd # hdd mov $6, %ah mov $0x3000, %bx mov %bx, %es mov $0x2000, %bx xor %cx, %cx xor %dx, %dx xor %bp, %bp int $0x1b jc error_hdd push %ax mov %es, %ax add $0x40, %ax mov %ax, %es pop %ax push %es push %bp lret # fdd fdd: xor %di, %di fdd_retry: mov $0xd6, %ah mov $0x3000, %bx mov %bx, %es mov $0x2000, %bx mov $0x0200, %cx mov $0x0001, %dx xor %bp, %bp int $0x1b jc error push %ax mov %es, %ax add $0x40, %ax mov %ax, %es pop %ax push %es push %bp lret error: or %di, %di jnz error_hdd and $0x0f, %al or $0x30, %al jmp fdd_retry error_hdd: jmp error .org 0x1fa .byte 0 # defflag_off .byte 0 # defpart_off .byte 1 # menu version .byte 0 .word 0xaa55