Home | History | Annotate | Line # | Download | only in bootyy
bootyy.c revision 1.1.32.1 
      1 /*	$NetBSD: bootyy.c,v 1.1.32.1 2005/04/29 11:28:27 kent 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  * 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 /*
     40  * This is a generic "first-stage" boot program.
     41  *
     42  * Note that this program has absolutely no filesystem knowledge!
     43  *
     44  * Instead, this uses a table of disk block numbers that are
     45  * filled in by the installboot program such that this program
     46  * can load the "second-stage" boot program.
     47  */
     48 
     49 #include <sys/param.h>
     50 #include <sys/time.h>
     51 #include <sys/exec.h>
     52 #include <machine/mon.h>
     53 
     54 #include <stand.h>
     55 #include "libsa.h"
     56 
     57 /* This determines the largest boot program we can load. */
     58 #define MAXBLOCKNUM	64
     59 
     60 /*
     61  * The block size used in the Sun Network Disk protocol.
     62  */
     63 #define SUNND_BSIZE (512)
     64 
     65 /*
     66  * The first block number we request.  This is related to historical
     67  * values; in 4.2BSD, the disklabel and the first stage boot program
     68  * are together called the bootblocks, and take up the first BBSIZE
     69  * bytes of the disk.  In 4.2BSD, BBSIZE was 8192 and the disk device
     70  * block size was 512 bytes (see the definition of SUNND_BSIZE below),
     71  * making the number of blocks taken up by the bootblocks (BBSIZE /
     72  * SUNND_BSIZE).  This value for FIRSTBLOCKNUM assumes that the
     73  * second-stage boot begins immediately after the bootblocks.  The
     74  * second-stage boot always runs contiguously for MAXBLOCKNUM blocks.
     75  * FIRSTBLOCKNUM can be increased, and MAXBLOCKNUM can be adjusted, as
     76  * long as they match up with however you're putting together the disk
     77  * image that is being served to this client.
     78  */
     79 #define FIRSTBLOCKNUM (8192 / SUNND_BSIZE)
     80 
     81 int     	block_size = SUNND_BSIZE;	/* default */
     82 
     83 int
     84 main(void)
     85 {
     86 	struct open_file	f;
     87 	void	*entry;
     88 	char	*addr;
     89 	int n, error;
     90 
     91 #ifdef DEBUG
     92 	printf("bootyy: open...\n");
     93 #endif
     94 	f.f_flags = F_RAW;
     95 	if (devopen(&f, 0, &addr)) {
     96 		printf("bootyy: devopen failed\n");
     97 		return;
     98 	}
     99 
    100 	addr = (char *)KERN_LOADADDR;
    101 	error = copyboot(&f, addr);
    102 	f.f_dev->dv_close(&f);
    103 	if (!error) {
    104 #ifdef DEBUG
    105 		printf("bootyy: start 0x%x\n", (long)addr);
    106 #endif
    107 		entry = addr;
    108 		chain_to(entry);
    109 	}
    110 	/* copyboot had a problem... */
    111 	return;
    112 }
    113 
    114 int
    115 copyboot(struct open_file *fp, char *addr)
    116 {
    117 	int	n, i, blknum;
    118 	char *buf;
    119 
    120 	/* Need to use a buffer that can be mapped into DVMA space. */
    121 	buf = alloc(block_size);
    122 	if (!buf)
    123 		panic("bootyy: alloc failed");
    124 
    125 	for (i = 0, blknum = FIRSTBLOCKNUM; i < MAXBLOCKNUM; i++, blknum++) {
    126 
    127 #ifdef DEBUG
    128 		printf("bootyy: block # %d = %d\n", i, blknum);
    129 #endif
    130 		if ((fp->f_dev->dv_strategy)(fp->f_devdata, F_READ,
    131 					   blknum, block_size, buf, &n))
    132 		{
    133 			printf("bootyy: read failed\n");
    134 			return -1;
    135 		}
    136 		if (n != block_size) {
    137 			printf("bootyy: short read\n");
    138 			return -1;
    139 		}
    140 		memcpy(addr, buf, block_size);
    141 		addr += block_size;
    142 	}
    143 
    144 	return 0;
    145 }
    146