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

   1 /*      $NetBSD$        */
   2
   3 /*-
   4  *  Copyright (c) 1993 John Brezak
   5  *  All rights reserved.
   6  *
   7  *  Redistribution and use in source and binary forms, with or without
   8  *  modification, are permitted provided that the following conditions
   9  *  are met:
  10  *  1. Redistributions of source code must retain the above copyright
  11  *     notice, this list of conditions and the following disclaimer.
  12  *  2. Redistributions in binary form must reproduce the above copyright
  13  *     notice, this list of conditions and the following disclaimer in the
  14  *     documentation and/or other materials provided with the distribution.
  15  *  3. The name of the author may not be used to endorse or promote products
  16  *     derived from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
  19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  21  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  22  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  23  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  24  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  26  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  27  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  28  * POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #include <lib/libsa/stand.h>
  32 #include <lib/libkern/libkern.h>
  33
  34 #include "biosdisk.h"
  35
  36 #include "boot.h"
  37 #include "bootinfo.h"
  38
  39 static int dev2bios(char *devname, unsigned int unit, int *biosdev);
  40 static int devlookup(char *d);
  41
  42 static int
  43 dev2bios(char *devname, unsigned int unit, int *biosdev)
  44 {
  45
  46         if (strcmp(devname, "hd") == 0) {
  47                 if (unit == 0 || unit == 1) {
  48                         *biosdev = 0x40 + (unit << 4);
  49                         return (0);
  50                 }
  51         }
  52         return (ENXIO);
  53 }
  54
  55 int
  56 bios2dev(int biosdev, char **devname, u_int *unit, u_int sector, u_int *ptnp)
  57 {
  58
  59         *devname = "hd";
  60         *unit = (biosdev >> 4) & 1;
  61         *ptnp = biosdisk_findptn(biosdev, sector);
  62         return (0);
  63 }
  64
  65 static int
  66 devlookup(char *d)
  67 {
  68         struct devsw *dp = devsw;
  69         int i;
  70
  71         for (i = 0; i < ndevs; i++, dp++) {
  72                 if ((dp->dv_name != NULL) && (strcmp(dp->dv_name, d) == 0)) {
  73                         return (i);
  74                 }
  75         }
  76
  77         printf("No such device - Configured devices are:\n");
  78         for (dp = devsw, i = 0; i < ndevs; i++, dp++) {
  79                 if (dp->dv_name != NULL) {
  80                         printf(" %s", dp->dv_name);
  81                 }
  82         }
  83         printf("\n");
  84         return (-1);
  85 }
  86
  87 int
  88 devopen(struct open_file *f, const char *fname, char **file)
  89 {
  90         static struct btinfo_bootpath bibp;
  91         struct devsw *dp;
  92         char *devname;
  93         unsigned int dev, ctlr, unit, partition;
  94         int biosdev;
  95         int error;
  96
  97 #if defined(DEBUG)
  98         printf("devopen: fname = %s\n", fname);
  99 #endif
 100
 101         ctlr = 0;
 102         if ((error = parsebootfile(fname, &devname, &unit, &partition,
 103             (const char **)file)) != 0) {
 104                 return (error);
 105         }
 106
 107 #if defined(DEBUG)
 108         printf("devopen: devname = %s\n", devname);
 109 #endif
 110         dev = devlookup(devname);
 111         if (dev == -1) {
 112 #if defined(DEBUG)
 113                 printf("devopen: devlookup failed\n");
 114 #endif
 115                 return (ENXIO);
 116         }
 117
 118         dp = &devsw[dev];
 119         if (dp->dv_open == NULL) {
 120 #if defined(DEBUG)
 121                 printf("devopen: dev->dv_open() == NULL\n");
 122 #endif
 123                 return (ENODEV);
 124         }
 125         f->f_dev = dp;
 126
 127         strncpy(bibp.bootpath, *file, sizeof(bibp.bootpath));
 128         BI_ADD(&bibp, BTINFO_BOOTPATH, sizeof(bibp));
 129
 130         if (dev2bios(devname, unit, &biosdev) == 0) {
 131 #if defined(DEBUG)
 132                 printf("devopen: bios disk\n");
 133 #endif
 134                 return (biosdisk_open(f, biosdev, partition));
 135         }
 136
 137 #if defined(DEBUG)
 138         printf("devopen: dev->dv_open()\n");
 139 #endif
 140         if ((error = (*dp->dv_open)(f, ctlr, unit, partition)) == 0) {
 141 #if defined(DEBUG)
 142                 printf("devopen: dev->dv_open() opened\n");
 143 #endif
 144                 return (0);
 145         }
 146
 147         printf("%s%d%c:%s : %s\n", dp->dv_name, unit, partition + 'a', *file,
 148             strerror(error));
 149         return (error);
 150 }