Differential D8404 Diff 24993 head/sys/boot/pc98/boot0/boot0.s

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head/sys/boot/pc98/boot0/boot0.s

Property	Old Value	New Value
svn:keywords	null	FreeBSD=%H \ No newline at end of property

				# 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 Unpublished rights reserved under the copyright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.
				#
				# $FreeBSD$

				.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