1 /* $NetBSD: bootyy.c,v 1.5 2009/01/12 07:00:59 tsutsui 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 } 142