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      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