sys/arch/i386/stand/boot/devopen.c

   1 /*      $NetBSD: devopen.c,v 1.8 2010/12/24 20:40:42 jakllsch Exp $      */
   2
   3 /*-
   4  * Copyright (c) 2005 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Bang Jun-Young.
   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  * Copyright (c) 1996, 1997
  34  *      Matthias Drochner.  All rights reserved.
  35  *
  36  * Redistribution and use in source and binary forms, with or without
  37  * modification, are permitted provided that the following conditions
  38  * are met:
  39  * 1. Redistributions of source code must retain the above copyright
  40  *    notice, this list of conditions and the following disclaimer.
  41  * 2. Redistributions in binary form must reproduce the above copyright
  42  *    notice, this list of conditions and the following disclaimer in the
  43  *    documentation and/or other materials provided with the distribution.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  46  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  47  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  48  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  49  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  50  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  51  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  52  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  53  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  54  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  55  */
  56
  57
  58 #include <sys/types.h>
  59
  60 #include <lib/libsa/stand.h>
  61 #include <lib/libkern/libkern.h>
  62
  63 #include <libi386.h>
  64 #include <biosdisk.h>
  65 #include "devopen.h"
  66 #ifdef _STANDALONE
  67 #include <bootinfo.h>
  68 #endif
  69 #ifdef SUPPORT_PS2
  70 #include <biosmca.h>
  71 #endif
  72
  73 static int dev2bios(char *, int, int *);
  74
  75 static int
  76 dev2bios(char *devname, int unit, int *biosdev)
  77 {
  78
  79         if (strcmp(devname, "hd") == 0)
  80                 *biosdev = 0x80 + unit;
  81         else if (strcmp(devname, "fd") == 0)
  82                 *biosdev = 0x00 + unit;
  83         else if (strcmp(devname, "cd") == 0)
  84                 *biosdev = boot_biosdev;
  85         else
  86                 return ENXIO;
  87
  88         return 0;
  89 }
  90
  91 void
  92 bios2dev(int biosdev, daddr_t sector, char **devname, int *unit, int *partition)
  93 {
  94
  95         /* set default */
  96         *unit = biosdev & 0x7f;
  97
  98         if (biosdev & 0x80) {
  99                 /*
 100                  * There seems to be no standard way of numbering BIOS
 101                  * CD-ROM drives. The following method is a little tricky
 102                  * but works nicely.
 103                  */
 104                 if (biosdev >= 0x80 + get_harddrives()) {
 105                         *devname = "cd";
 106                         *unit = 0;              /* override default */
 107                 } else
 108                         *devname = "hd";
 109         } else
 110                 *devname = "fd";
 111
 112         *partition = biosdisk_findpartition(biosdev, sector);
 113 }
 114
 115 #ifdef _STANDALONE
 116 struct btinfo_bootpath bibp;
 117 extern bool kernel_loaded;
 118 #endif
 119
 120 /*
 121  * Open the BIOS disk device
 122  */
 123 int
 124 devopen(struct open_file *f, const char *fname, char **file)
 125 {
 126         char *fsname, *devname;
 127         int unit, partition;
 128         int biosdev;
 129         int error;
 130
 131         if ((error = parsebootfile(fname, &fsname, &devname,
 132                                    &unit, &partition, (const char **) file))
 133             || (error = dev2bios(devname, unit, &biosdev)))
 134                 return error;
 135
 136         f->f_dev = &devsw[0];           /* must be biosdisk */
 137
 138 #ifdef _STANDALONE
 139         if (!kernel_loaded) {
 140                 strncpy(bibp.bootpath, *file, sizeof(bibp.bootpath));
 141                 BI_ADD(&bibp, BTINFO_BOOTPATH, sizeof(bibp));
 142         }
 143 #endif
 144
 145         return biosdisk_open(f, biosdev, partition);
 146 }