1 /* $NetBSD: boot1.c,v 1.1 2003/04/16 22:17:44 dsl Exp $ */ 2 3 /*- 4 * Copyright (c) 2003 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by David Laight. 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 #include <sys/cdefs.h> 40 __RCSID("$NetBSD: boot1.c,v 1.1 2003/04/16 22:17:44 dsl Exp $"); 41 42 #include <lib/libsa/stand.h> 43 #include <lib/libkern/libkern.h> 44 #include <biosdisk_ll.h> 45 46 #include <sys/param.h> 47 #include <sys/bootblock.h> 48 49 static uint32_t bios_dev; 50 static uint32_t bios_sector; 51 52 struct biosdisk_ll d; 53 54 const char *boot1(uint32_t biosdev, uint32_t sector); 55 extern void putstr(const char *); 56 57 const char * 58 boot1(uint32_t biosdev, uint32_t sector) 59 { 60 struct stat sb; 61 int fd; 62 63 bios_sector = sector; 64 bios_dev = biosdev; 65 d.dev = biosdev; 66 67 putstr("\r\nNetBSD/i386 Primary Bootstrap\r\n"); 68 69 if (set_geometry(&d, NULL)) 70 return "set_geometry\r\n"; 71 72 fd = open("boot", 0); 73 if (fd == -1 || fstat(fd, &sb) == -1) 74 return "Can't open /boot.\r\n"; 75 76 #if 0 77 if (sb.st_size > SECONDARY_MAX_LOAD) 78 return "/boot too large.\r\n"; 79 #endif 80 81 if (read(fd, (void *)SECONDARY_LOAD_ADDRESS, sb.st_size) != sb.st_size) 82 return "/boot load failed.\r\n"; 83 84 if (*(uint32_t *)(SECONDARY_LOAD_ADDRESS + 4) != X86_BOOT_MAGIC_2) 85 return "Invalid /boot file format.\r\n"; 86 87 /* We need to jump to the secondary bootstrap in realmode */ 88 return 0; 89 } 90 91 int 92 blkdevstrategy(void *devdata, int flag, daddr_t dblk, size_t size, void *buf, size_t *rsize) 93 { 94 if (flag != F_READ) 95 return EROFS; 96 97 if (size & (BIOSDISK_SECSIZE - 1)) 98 return EINVAL; 99 100 if (rsize) 101 *rsize = size; 102 103 if (size != 0 && readsects(&d, bios_sector + dblk, 104 size / BIOSDISK_SECSIZE, buf, 1) != 0) 105 return EIO; 106 107 return 0; 108 } 109