1/*	$NetBSD: sparc.c,v 1.10 2006/02/18 10:08:07 dsl 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 1.10 2006/02/18 10:08:07 dsl 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
53static 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
62static int sparc_clearheader(ib_params *, struct bbinfo_params *, uint8_t *);
63static int sparc_setheader(ib_params *, struct bbinfo_params *, uint8_t *);
64
65static int sparc_clearboot(ib_params *);
66static int sparc_setboot(ib_params *);
67
68struct ib_mach ib_mach_sparc =
69	{ "sparc", sparc_setboot, sparc_clearboot, no_editboot,
70		IB_STAGE2START };
71
72static int
73sparc_clearboot(ib_params *params)
74{
75
76	assert(params != NULL);
77
78	return (shared_bbinfo_clearboot(params, &bbparams, sparc_clearheader));
79}
80
81static int
82sparc_setboot(ib_params *params)
83{
84	assert(params != NULL);
85
86	return (shared_bbinfo_setboot(params, &bbparams, sparc_setheader));
87}
88
89
90static int
91sparc_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
103static int
104sparc_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