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boot1.c revision 1.1 
      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