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      1 /*	$NetBSD: boot1.c,v 1.2 2008/04/28 20:23:26 martin 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  *
     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 #include <sys/cdefs.h>
     33 __RCSID("$NetBSD: boot1.c,v 1.2 2008/04/28 20:23:26 martin Exp $");
     34 
     35 #include <lib/libsa/stand.h>
     36 #include <lib/libkern/libkern.h>
     37 
     38 #include <sys/param.h>
     39 #include <sys/bootblock.h>
     40 #include <sys/disklabel.h>
     41 #include <dev/raidframe/raidframevar.h>	/* For RF_PROTECTED_SECTORS */
     42 
     43 #include "biosdisk_ll.h"
     44 
     45 #define	XSTR(x)	#x
     46 #define	STR(x)	XSTR(x)
     47 
     48 static uint32_t bios_sector;
     49 
     50 const char *boot1(uint32_t *);
     51 void putstr(const char *str);
     52 int raise(int sig);
     53 
     54 extern struct disklabel ptn_disklabel;
     55 
     56 const char *
     57 boot1(uint32_t *sector)
     58 {
     59         struct stat sb;
     60 	int fd;
     61 
     62 	bios_sector = *sector;
     63 
     64 	putstr("\r\nNetBSD/" MACHINE " " STR(FS) " Primary Bootstrap\r\n");
     65 
     66 	do {
     67 		/*
     68 		 * We default to the filesystem at the start of the
     69 		 * MBR partition
     70 		 */
     71 		fd = open("boot", 0);
     72 		if (fd != -1)
     73 			break;
     74 
     75 		/*
     76 		 * Maybe the filesystem is enclosed in a raid set.
     77 		 * add in size of raidframe header and try again.
     78 		 * (Maybe this should only be done if the filesystem
     79 		 * magic number is absent.)
     80 		 */
     81 		bios_sector += RF_PROTECTED_SECTORS;
     82 		fd = open("boot", 0);
     83 		if (fd != -1)
     84 			break;
     85 
     86 		/*
     87 		 * Nothing at the start of the MBR partition, fallback on
     88 		 * partition 'a' from the disklabel in this MBR partition.
     89 		 */
     90 		if (ptn_disklabel.d_magic != DISKMAGIC)
     91 			break;
     92 		if (ptn_disklabel.d_magic2 != DISKMAGIC)
     93 			break;
     94 		if (ptn_disklabel.d_partitions[0].p_fstype == FS_UNUSED)
     95 			break;
     96 
     97 		bios_sector = ptn_disklabel.d_partitions[0].p_offset;
     98 		*sector = bios_sector;
     99 		if (ptn_disklabel.d_partitions[0].p_fstype == FS_RAID)
    100 			bios_sector += RF_PROTECTED_SECTORS;
    101 		fd = open("boot", 0);
    102 	} while (0);
    103 
    104 	if (fd == -1 || fstat(fd, &sb) == -1)
    105 		return "Can't open /boot.\r\n";
    106 
    107 #if 0
    108 	if (sb.st_size > SECONDARY_MAX_LOAD)
    109 		return "/boot too large.\r\n";
    110 #endif
    111 
    112 	if (read(fd, (void *)SECONDARY_LOAD_ADDRESS, sb.st_size) != sb.st_size)
    113 		return "/boot load failed.\r\n";
    114 
    115 	if (*(uint32_t *)(SECONDARY_LOAD_ADDRESS + 4) != LANDISK_BOOT_MAGIC_2)
    116 		return "Invalid /boot file format.\r\n";
    117 
    118 	return 0;
    119 }
    120 
    121 int
    122 blkdevstrategy(void *devdata, int flag, daddr_t dblk, size_t size, void *buf, size_t *rsize)
    123 {
    124 
    125 	if (flag != F_READ)
    126 		return EROFS;
    127 
    128 	if (size & (BIOSDISK_SECSIZE - 1))
    129 		return EINVAL;
    130 
    131 	if (rsize)
    132 		*rsize = size;
    133 
    134 	if (size != 0 && readsects(0x40, bios_sector + dblk, buf,
    135 				   size / BIOSDISK_SECSIZE) != 0)
    136 		return EIO;
    137 
    138 	return 0;
    139 }
    140 
    141 /*ARGUSED*/
    142 int
    143 raise(int sig)
    144 {
    145 
    146 	return 0;
    147 }
    148