1 /* $NetBSD: sparc.c,v 1.11 2008/04/28 20:24:16 martin 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 *
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 #if HAVE_NBTOOL_CONFIG_H
33 #include "nbtool_config.h"
34 #endif
35
36 #include <sys/cdefs.h>
37 #if !defined(__lint)
38 __RCSID("$NetBSD: sparc.c,v 1.11 2008/04/28 20:24:16 martin Exp $");
39 #endif /* !__lint */
40
41 #include <sys/param.h>
42
43 #include <assert.h>
44 #include <err.h>
45 #include <stddef.h>
46 #include <stdio.h>
47 #include <stdlib.h>
48 #include <string.h>
49 #include <unistd.h>
50
51 #include "installboot.h"
52
53 static struct bbinfo_params bbparams = {
54 SPARC_BBINFO_MAGIC,
55 SPARC_BOOT_BLOCK_OFFSET,
56 SPARC_BOOT_BLOCK_BLOCKSIZE,
57 SPARC_BOOT_BLOCK_MAX_SIZE,
58 32, /* leave room for a.out header */
59 BBINFO_BIG_ENDIAN,
60 };
61
62 static int sparc_clearheader(ib_params *, struct bbinfo_params *, uint8_t *);
63 static int sparc_setheader(ib_params *, struct bbinfo_params *, uint8_t *);
64
65 static int sparc_clearboot(ib_params *);
66 static int sparc_setboot(ib_params *);
67
68 struct ib_mach ib_mach_sparc =
69 { "sparc", sparc_setboot, sparc_clearboot, no_editboot,
70 IB_STAGE2START };
71
72 static int
sparc_clearboot(ib_params * params)73 sparc_clearboot(ib_params *params)
74 {
75
76 assert(params != NULL);
77
78 return (shared_bbinfo_clearboot(params, &bbparams, sparc_clearheader));
79 }
80
81 static int
sparc_setboot(ib_params * params)82 sparc_setboot(ib_params *params)
83 {
84 assert(params != NULL);
85
86 return (shared_bbinfo_setboot(params, &bbparams, sparc_setheader));
87 }
88
89
90 static int
sparc_clearheader(ib_params * params,struct bbinfo_params * bb_params,uint8_t * bb)91 sparc_clearheader(ib_params *params, struct bbinfo_params *bb_params,
92 uint8_t *bb)
93 {
94
95 assert(params != NULL);
96 assert(bb_params != NULL);
97 assert(bb != NULL);
98
99 memset(bb, 0, bb_params->headeroffset);
100 return (1);
101 }
102
103 static int
sparc_setheader(ib_params * params,struct bbinfo_params * bb_params,uint8_t * bb)104 sparc_setheader(ib_params *params, struct bbinfo_params *bb_params, uint8_t *bb)
105 {
106
107 assert(params != NULL);
108 assert(bb_params != NULL);
109 assert(bb != NULL);
110
111 /*
112 * sun4c/sun4m PROMs require an a.out(5) format header.
113 * Old-style sun4 PROMs do not expect a header at all.
114 * To deal with this, we construct a header that is also executable
115 * code containing a forward branch that gets us past the 32-byte
116 * header where the actual code begins. In assembly:
117 * .word MAGIC ! a NOP
118 * ba,a start !
119 * .skip 24 ! pad
120 * start:
121 */
122 #define SUN_MAGIC 0x01030107
123 #define SUN4_BASTART 0x30800007 /* i.e.: ba,a `start' */
124 *((uint32_t *)bb) = htobe32(SUN_MAGIC);
125 *((uint32_t *)bb + 1) = htobe32(SUN4_BASTART);
126
127 return (1);
128 }
129