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sparc.c revision 1.9 
      1 /*	$NetBSD: sparc.c,v 1.9 2003/10/27 00:12:44 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 #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 1.9 2003/10/27 00:12:44 lukem 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 int
     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 int
     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
     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
    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