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 * 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 #if HAVE_NBTOOL_CONFIG_H 40 #include "nbtool_config.h" 41 #endif 42 43 #include <sys/cdefs.h> 44 #if !defined(__lint) 45 __RCSID("$NetBSD: sparc.c,v 1.10 2006/02/18 10:08:07 dsl Exp $"); 46 #endif /* !__lint */ 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 static int sparc_clearboot(ib_params *); 73 static int sparc_setboot(ib_params *); 74 75 struct ib_mach ib_mach_sparc = 76 { "sparc", sparc_setboot, sparc_clearboot, no_editboot, 77 IB_STAGE2START }; 78 79 static int 80 sparc_clearboot(ib_params *params) 81 { 82 83 assert(params != NULL); 84 85 return (shared_bbinfo_clearboot(params, &bbparams, sparc_clearheader)); 86 } 87 88 static int 89 sparc_setboot(ib_params *params) 90 { 91 assert(params != NULL); 92 93 return (shared_bbinfo_setboot(params, &bbparams, sparc_setheader)); 94 } 95 96 97 static int 98 sparc_clearheader(ib_params *params, struct bbinfo_params *bb_params, 99 uint8_t *bb) 100 { 101 102 assert(params != NULL); 103 assert(bb_params != NULL); 104 assert(bb != NULL); 105 106 memset(bb, 0, bb_params->headeroffset); 107 return (1); 108 } 109 110 static int 111 sparc_setheader(ib_params *params, struct bbinfo_params *bb_params, uint8_t *bb) 112 { 113 114 assert(params != NULL); 115 assert(bb_params != NULL); 116 assert(bb != NULL); 117 118 /* 119 * sun4c/sun4m PROMs require an a.out(5) format header. 120 * Old-style sun4 PROMs do not expect a header at all. 121 * To deal with this, we construct a header that is also executable 122 * code containing a forward branch that gets us past the 32-byte 123 * header where the actual code begins. In assembly: 124 * .word MAGIC ! a NOP 125 * ba,a start ! 126 * .skip 24 ! pad 127 * start: 128 */ 129 #define SUN_MAGIC 0x01030107 130 #define SUN4_BASTART 0x30800007 /* i.e.: ba,a `start' */ 131 *((uint32_t *)bb) = htobe32(SUN_MAGIC); 132 *((uint32_t *)bb + 1) = htobe32(SUN4_BASTART); 133 134 return (1); 135 } 136