Added PC-98 HDD boot manager. The boot0 is the `IPL' which occupies

sector 0 of a disk and boot0.5 is the `boot selector' which starts
from address 0x400.  The IPL loads boot0.5 and boot0.5 loads bootblock
of a slice.

The boot manager stuff was developed by me (kato) with Borland C++,
and then, translated into bcc in the ports collection by Nokubi-san.
After that, boot0 has been translated into gas with the .code16
directive by Takahashi-san (nyan) and boot0.5 has been rewritten in
gas by me.

2 files changed, 128 insertions, 0 deletions

diff --git a/sys/boot/pc98/boot0/Makefile b/sys/boot/pc98/boot0/Makefile
new file mode 100644
index 0000000..27a2a3a
--- /dev/null
+++ b/sys/boot/pc98/boot0/Makefile
@@ -0,0 +1,20 @@
+# $FreeBSD$
+
+PROG=		boot0
+OBJS=		boot0.o
+NOMAN=
+STRIP=
+BINDIR?=	/boot
+BINMODE=	444
+
+ORG=		0x0000
+
+boot0: boot0.out
+	objcopy -S -O binary boot0.out ${.TARGET}
+
+boot0.out: ${OBJS}
+	${LD} -N -e start -Ttext ${ORG} -o ${.TARGET} ${OBJS}
+
+CLEANFILES+= boot0.out
+
+.include <bsd.prog.mk>
diff --git a/sys/boot/pc98/boot0/boot0.s b/sys/boot/pc98/boot0/boot0.s
new file mode 100644
index 0000000..508e252
--- /dev/null
+++ b/sys/boot/pc98/boot0/boot0.s
@@ -0,0 +1,108 @@
+# 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  Unpublished rights reserved under the copyright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