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sparc.c revision 1.5 
      1 /*	$NetBSD: sparc.c,v 1.5 2002/05/15 09:44:55 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 1.5 2002/05/15 09:44:55 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 	0,
     67 };
     68 
     69 int
     70 sparc_clearboot(ib_params *params)
     71 {
     72 
     73 	assert(params != NULL);
     74 
     75 	if (params->flags & IB_STAGE1START) {
     76 		warnx("`-b bno' is not supported for %s",
     77 		    params->machine->name);
     78 		return (0);
     79 	}
     80 	return (shared_bbinfo_clearboot(params, &bbparams));
     81 }
     82 
     83 static int
     84 sparc_frobheader(ib_params *params, struct bbinfo_params *bb_params, char *bb)
     85 {
     86 
     87 	assert(params != NULL);
     88 	assert(bb_params != NULL);
     89 	assert(bb != NULL);
     90 
     91 	/*
     92 	 * sun4c/sun4m PROMs require an a.out(5) format header.
     93 	 * Old-style sun4 PROMs do not expect a header at all.
     94 	 * To deal with this, we construct a header that is also executable
     95 	 * code containing a forward branch that gets us past the 32-byte
     96 	 * header where the actual code begins. In assembly:
     97 	 * 	.word	MAGIC		! a NOP
     98 	 * 	ba,a	start		!
     99 	 * 	.skip	24		! pad
    100 	 * start:
    101 	 */
    102 #define SUN_MAGIC	0x01030107
    103 #define SUN4_BASTART	0x30800007	/* i.e.: ba,a `start' */
    104 	*((uint32_t *)bb) = htobe32(SUN_MAGIC);
    105 	*((uint32_t *)bb + 1) = htobe32(SUN4_BASTART);
    106 
    107 	return (1);
    108 }
    109 
    110 int
    111 sparc_setboot(ib_params *params)
    112 {
    113 	assert(params != NULL);
    114 
    115 	if (params->flags & IB_STAGE1START) {
    116 		warnx("`-b bno' is not supported for %s",
    117 		    params->machine->name);
    118 		return (0);
    119 	}
    120 	return (shared_bbinfo_setboot(params, &bbparams, sparc_frobheader));
    121 }
    122