xref: /netbsd/usr.sbin/installboot/arch/sparc.c (revision bf9ec67e)
1 /*	$NetBSD: sparc.c,v 1.7 2002/05/20 16:05:27 lukem Exp $ */
2 
3 /*-
4  * Copyright (c) 1998, 2002 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * This code is derived from software contributed to The NetBSD Foundation
8  * by Paul Kranenburg and Luke Mewburn.
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  * 3. All advertising materials mentioning features or use of this software
19  *    must display the following acknowledgement:
20  *	This product includes software developed by the NetBSD
21  *	Foundation, Inc. and its contributors.
22  * 4. Neither the name of The NetBSD Foundation nor the names of its
23  *    contributors may be used to endorse or promote products derived
24  *    from this software without specific prior written permission.
25  *
26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36  * POSSIBILITY OF SUCH DAMAGE.
37  */
38 
39 #include <sys/cdefs.h>
40 #if defined(__RCSID) && !defined(__lint)
41 __RCSID("$NetBSD: sparc.c,v 1.7 2002/05/20 16:05:27 lukem Exp $");
42 #endif	/* !__lint */
43 
44 #if HAVE_CONFIG_H
45 #include "config.h"
46 #endif
47 
48 #include <sys/param.h>
49 
50 #include <assert.h>
51 #include <err.h>
52 #include <stddef.h>
53 #include <stdio.h>
54 #include <stdlib.h>
55 #include <string.h>
56 #include <unistd.h>
57 
58 #include "installboot.h"
59 
60 static struct bbinfo_params bbparams = {
61 	SPARC_BBINFO_MAGIC,
62 	SPARC_BOOT_BLOCK_OFFSET,
63 	SPARC_BOOT_BLOCK_BLOCKSIZE,
64 	SPARC_BOOT_BLOCK_MAX_SIZE,
65 	32,			/* leave room for a.out header */
66 	BBINFO_BIG_ENDIAN,
67 };
68 
69 static int sparc_clearheader(ib_params *, struct bbinfo_params *, uint8_t *);
70 static int sparc_setheader(ib_params *, struct bbinfo_params *, uint8_t *);
71 
72 int
73 sparc_clearboot(ib_params *params)
74 {
75 
76 	assert(params != NULL);
77 
78 	if (params->flags & IB_STAGE1START) {
79 		warnx("`-b bno' is not supported for %s",
80 		    params->machine->name);
81 		return (0);
82 	}
83 	return (shared_bbinfo_clearboot(params, &bbparams, sparc_clearheader));
84 }
85 
86 int
87 sparc_setboot(ib_params *params)
88 {
89 	assert(params != NULL);
90 
91 	if (params->flags & IB_STAGE1START) {
92 		warnx("`-b bno' is not supported for %s",
93 		    params->machine->name);
94 		return (0);
95 	}
96 	return (shared_bbinfo_setboot(params, &bbparams, sparc_setheader));
97 }
98 
99 
100 static int
101 sparc_clearheader(ib_params *params, struct bbinfo_params *bb_params,
102 	uint8_t *bb)
103 {
104 
105 	assert(params != NULL);
106 	assert(bb_params != NULL);
107 	assert(bb != NULL);
108 
109 	memset(bb, 0, bb_params->headeroffset);
110 	return (1);
111 }
112 
113 static int
114 sparc_setheader(ib_params *params, struct bbinfo_params *bb_params, uint8_t *bb)
115 {
116 
117 	assert(params != NULL);
118 	assert(bb_params != NULL);
119 	assert(bb != NULL);
120 
121 	/*
122 	 * sun4c/sun4m PROMs require an a.out(5) format header.
123 	 * Old-style sun4 PROMs do not expect a header at all.
124 	 * To deal with this, we construct a header that is also executable
125 	 * code containing a forward branch that gets us past the 32-byte
126 	 * header where the actual code begins. In assembly:
127 	 * 	.word	MAGIC		! a NOP
128 	 * 	ba,a	start		!
129 	 * 	.skip	24		! pad
130 	 * start:
131 	 */
132 #define SUN_MAGIC	0x01030107
133 #define SUN4_BASTART	0x30800007	/* i.e.: ba,a `start' */
134 	*((uint32_t *)bb) = htobe32(SUN_MAGIC);
135 	*((uint32_t *)bb + 1) = htobe32(SUN4_BASTART);
136 
137 	return (1);
138 }
139