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