sys/arch/sun68k/stand/bootyy/bootyy.c

   1 /*      $NetBSD: bootyy.c,v 1.4 2008/04/28 20:23:38 martin Exp $ */
   2
   3 /*-
   4  * Copyright (c) 1998 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.
   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 /*
  33  * This is a generic "first-stage" boot program.
  34  *
  35  * Note that this program has absolutely no filesystem knowledge!
  36  *
  37  * Instead, this uses a table of disk block numbers that are
  38  * filled in by the installboot program such that this program
  39  * can load the "second-stage" boot program.
  40  */
  41
  42 #include <sys/param.h>
  43 #include <sys/time.h>
  44 #include <sys/exec.h>
  45 #include <machine/mon.h>
  46
  47 #include <stand.h>
  48 #include "libsa.h"
  49
  50 int copyboot(struct open_file *, char *);
  51
  52 /* This determines the largest boot program we can load. */
  53 #define MAXBLOCKNUM     64
  54
  55 /*
  56  * The block size used in the Sun Network Disk protocol.
  57  */
  58 #define SUNND_BSIZE (512)
  59
  60 /*
  61  * The first block number we request.  This is related to historical
  62  * values; in 4.2BSD, the disklabel and the first stage boot program
  63  * are together called the bootblocks, and take up the first BBSIZE
  64  * bytes of the disk.  In 4.2BSD, BBSIZE was 8192 and the disk device
  65  * block size was 512 bytes (see the definition of SUNND_BSIZE below),
  66  * making the number of blocks taken up by the bootblocks (BBSIZE /
  67  * SUNND_BSIZE).  This value for FIRSTBLOCKNUM assumes that the
  68  * second-stage boot begins immediately after the bootblocks.  The
  69  * second-stage boot always runs contiguously for MAXBLOCKNUM blocks.
  70  * FIRSTBLOCKNUM can be increased, and MAXBLOCKNUM can be adjusted, as
  71  * long as they match up with however you're putting together the disk
  72  * image that is being served to this client.
  73  */
  74 #define FIRSTBLOCKNUM (8192 / SUNND_BSIZE)
  75
  76 int             block_size = SUNND_BSIZE;       /* default */
  77
  78 int
  79 main(void)
  80 {
  81         struct open_file        f;
  82         void    *entry;
  83         char    *addr;
  84         int error;
  85
  86 #ifdef DEBUG
  87         printf("bootyy: open...\n");
  88 #endif
  89         f.f_flags = F_RAW;
  90         if (devopen(&f, 0, &addr)) {
  91                 printf("bootyy: devopen failed\n");
  92                 return 1;
  93         }
  94
  95         addr = (char *)KERN_LOADADDR;
  96         error = copyboot(&f, addr);
  97         f.f_dev->dv_close(&f);
  98         if (!error) {
  99 #ifdef DEBUG
 100                 printf("bootyy: start 0x%x\n", (long)addr);
 101 #endif
 102                 entry = addr;
 103                 chain_to(entry);
 104         }
 105         /* copyboot had a problem... */
 106         return 0;
 107 }
 108
 109 int
 110 copyboot(struct open_file *fp, char *addr)
 111 {
 112         size_t n;
 113         int i, blknum;
 114         char *buf;
 115
 116         /* Need to use a buffer that can be mapped into DVMA space. */
 117         buf = alloc(block_size);
 118         if (!buf)
 119                 panic("bootyy: alloc failed");
 120
 121         for (i = 0, blknum = FIRSTBLOCKNUM; i < MAXBLOCKNUM; i++, blknum++) {
 122
 123 #ifdef DEBUG
 124                 printf("bootyy: block # %d = %d\n", i, blknum);
 125 #endif
 126                 if ((fp->f_dev->dv_strategy)(fp->f_devdata, F_READ,
 127                                            blknum, block_size, buf, &n))
 128                 {
 129                         printf("bootyy: read failed\n");
 130                         return -1;
 131                 }
 132                 if (n != block_size) {
 133                         printf("bootyy: short read\n");
 134                         return -1;
 135                 }
 136                 memcpy(addr, buf, block_size);
 137                 addr += block_size;
 138         }
 139
 140         return 0;
 141 }