usr.sbin/installboot/arch/sparc.c

   1 /*      $NetBSD: sparc.c,v 1.11 2008/04/28 20:24:16 martin 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 1.11 2008/04/28 20:24:16 martin 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         { "sparc", sparc_setboot, sparc_clearboot, no_editboot,
  70                 IB_STAGE2START };
  71
  72 static 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 static 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 }