1 /* $NetBSD: sparc.c,v 1.12 2019/05/07 04:35:31 thorpej 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 1.12 2019/05/07 04:35:31 thorpej 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 .name = "sparc", 70 .setboot = sparc_setboot, 71 .clearboot = sparc_clearboot, 72 .editboot = no_editboot, 73 .valid_flags = IB_STAGE2START, 74 }; 75 76 static int 77 sparc_clearboot(ib_params *params) 78 { 79 80 assert(params != NULL); 81 82 return (shared_bbinfo_clearboot(params, &bbparams, sparc_clearheader)); 83 } 84 85 static int 86 sparc_setboot(ib_params *params) 87 { 88 assert(params != NULL); 89 90 return (shared_bbinfo_setboot(params, &bbparams, sparc_setheader)); 91 } 92 93 94 static int 95 sparc_clearheader(ib_params *params, struct bbinfo_params *bb_params, 96 uint8_t *bb) 97 { 98 99 assert(params != NULL); 100 assert(bb_params != NULL); 101 assert(bb != NULL); 102 103 memset(bb, 0, bb_params->headeroffset); 104 return (1); 105 } 106 107 static int 108 sparc_setheader(ib_params *params, struct bbinfo_params *bb_params, uint8_t *bb) 109 { 110 111 assert(params != NULL); 112 assert(bb_params != NULL); 113 assert(bb != NULL); 114 115 /* 116 * sun4c/sun4m PROMs require an a.out(5) format header. 117 * Old-style sun4 PROMs do not expect a header at all. 118 * To deal with this, we construct a header that is also executable 119 * code containing a forward branch that gets us past the 32-byte 120 * header where the actual code begins. In assembly: 121 * .word MAGIC ! a NOP 122 * ba,a start ! 123 * .skip 24 ! pad 124 * start: 125 */ 126 #define SUN_MAGIC 0x01030107 127 #define SUN4_BASTART 0x30800007 /* i.e.: ba,a `start' */ 128 *((uint32_t *)bb) = htobe32(SUN_MAGIC); 129 *((uint32_t *)bb + 1) = htobe32(SUN4_BASTART); 130 131 return (1); 132 } 133