1/*	$NetBSD: bootxx.S,v 1.9 2008/04/28 20:23:25 martin Exp $	*/
2
3/*-
4 * Copyright (c) 2003 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by David Laight.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <machine/asm.h>
33#include <sys/bootblock.h>
34
35/*
36 * Code linked to 0xa00 and copied to sectors 2+ of the netbsd boot
37 * partition by MI /usr/sbin/installboot.
38 * Read into memory by code in pbr.S
39 *
40 * On entry:
41 * 	%dl			BIOS drive number
42 *	%edi:%esi		Sector number of NetBSD partition
43 *	%cs, %ds, %es, %ss	All zero
44 *	%sp			near 0xfffc
45 */
46	.text
47	.code16
48ENTRY(bootxx)
49	jmp	1f
50	.balign	4
51ENTRY(bootxx_magic)
52	.long	X86_BOOT_MAGIC_1	/* checked by installboot & pbr code */
53boot_params:				/* space for patchable variables */
54	.long	1f - boot_params	/* length of this data area */
55#include <boot_params.S>
56	. = bootxx + 0x80		/* Space for patching unknown params */
57
581:	call	gdt_fixup
59
60	calll	real_to_prot
61	.code32
62
63	push	%edi
64	movl	$_end, %ecx		/* zero bss */
65	movl	$__bss_start, %edi
66	subl	%edi, %ecx
67	shr	$2, %ecx		/* _end and __bss_start are aligned */
68	xor	%eax, %eax
69	rep
70	stosl
71	pop	%edi
72
73	movzbl	%dl, %edx
74	push	%edi			/* save args for secondary bootstrap */
75	push	%esi
76	movl	%esp, %esi		/* address of sector number */
77	push	%edx
78	push	%esi			/* args for boot1 */
79	push	%edx
80	call	_C_LABEL(boot1)		/* C code to load /boot */
81	add	$8, %esp
82	call	prot_to_real
83	.code16
84
85	test	%ax, %ax
86	jnz	boot_fail
87
88	pop	%edx			/* bios disk number */
89	pop	%ebx			/* expected partition start sector */
90	pop	%ecx
91	movl	$boot_params, %esi
92	orb	$X86_BP_FLAGS_LBA64VALID, 4(%esi)
93	lcall	$SECONDARY_LOAD_ADDRESS/16, $0
94
95boot_fail:
96	push	%ax			/* error string from boot1 */
97	movw	errno, %ax
98	aam				/* largest errno is < 100 */
99	addw	$('0' << 8) | '0', %ax	/* to ascii */
100	rorw	$8, %ax
101	cmpb	$'0', %al		/* supress leading zero */
102	jne	10f
103	movb	$' ', %al
10410:	movw	%ax, 12f
105	movw	$11f, %si
106	call	message			/* output boot failed message */
107	pop	%si
108	call	message			/* and text from boot1 */
109	jmp	loopstop
11011:	.ascii	"Boot failed (errno "
11112:	.asciz	"xx): "
112
113ENTRY(_rtt)
114	.code32
115	call	prot_to_real
116	.code16
117loopstop:
118	movb	0x86, %ah		/* delay for about a second */
119	movw	$16, %cx
120	int	$0x15
121	int	$0x18			/* might be a boot fail entry */
1221:	sti				/* if not loopstop */
123	hlt
124	jmp	1b
125
126	/*
127	 * Vector the fs calls through here so we can support multiple
128	 * file system types with one copy of the library code and
129	 * multiple copies of this file.
130	 */
131	.global	xxfs_open, xxfs_close, xxfs_read, xxfs_stat
132	.code32
133xxfs_open:	jmp	XXfs_open
134xxfs_close:	jmp	XXfs_close
135xxfs_read:	jmp	XXfs_read
136xxfs_stat:	jmp	XXfs_stat
137