lib/libdisk/change.c

   1 /*
   2  * ----------------------------------------------------------------------------
   3  * "THE BEER-WARE LICENSE" (Revision 42):
   4  * <phk@FreeBSD.org> wrote this file.  As long as you retain this notice you
   5  * can do whatever you want with this stuff. If we meet some day, and you think
   6  * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
   7  * ----------------------------------------------------------------------------
   8  */
   9
  10 #include <sys/cdefs.h>
  11 __FBSDID("$FreeBSD$");
  12
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <unistd.h>
  16 #include <fcntl.h>
  17 #include <string.h>
  18 #include <sys/types.h>
  19 #include "libdisk.h"
  20
  21 void
  22 Set_Bios_Geom(struct disk *disk, u_long cyl, u_long hd, u_long sect)
  23 {
  24
  25         disk->bios_cyl = cyl;
  26         disk->bios_hd = hd;
  27         disk->bios_sect = sect;
  28 }
  29
  30 void
  31 Sanitize_Bios_Geom(struct disk *disk)
  32 {
  33         int sane;
  34
  35         sane = 1;
  36
  37 #ifdef PC98
  38         if (disk->bios_cyl >= 65536)
  39 #else
  40         if (disk->bios_cyl > 1024)
  41 #endif
  42                 sane = 0;
  43 #ifdef PC98
  44         if (disk->bios_hd >= 256)
  45 #else
  46         if (disk->bios_hd > 16)
  47 #endif
  48                 sane = 0;
  49 #ifdef PC98
  50         if (disk->bios_sect >= 256)
  51 #else
  52         if (disk->bios_sect > 63)
  53 #endif
  54                 sane = 0;
  55         if (disk->bios_cyl * disk->bios_hd * disk->bios_sect !=
  56             disk->chunks->size)
  57                 sane = 0;
  58         if (sane)
  59                 return;
  60
  61         /* First try something that IDE can handle */
  62         disk->bios_sect = 63;
  63         disk->bios_hd = 16;
  64         disk->bios_cyl = disk->chunks->size /
  65                 (disk->bios_sect * disk->bios_hd);
  66
  67 #ifdef PC98
  68         if (disk->bios_cyl < 65536)
  69 #else
  70         if (disk->bios_cyl < 1024)
  71 #endif
  72                 return;
  73
  74         /* Hmm, try harder... */
  75         /* Assume standard SCSI parameter */
  76 #ifdef PC98
  77         disk->bios_sect = 128;
  78         disk->bios_hd = 8;
  79 #else
  80         disk->bios_hd = 255;
  81 #endif
  82         disk->bios_cyl = disk->chunks->size /
  83                 (disk->bios_sect * disk->bios_hd);
  84
  85 #ifdef PC98
  86         if (disk->bios_cyl < 65536)
  87                 return;
  88
  89         /* Assume UIDE-133/98-A Challenger BIOS 0.9821C parameter */
  90         disk->bios_sect = 255;
  91         disk->bios_hd = 16;
  92         disk->bios_cyl = disk->chunks->size /
  93                 (disk->bios_sect * disk->bios_hd);
  94
  95         if (disk->bios_cyl < 65536)
  96                 return;
  97
  98         /* BIG-na-Drive? */
  99         disk->bios_hd = 255;
 100         disk->bios_cyl = disk->chunks->size /
 101                 (disk->bios_sect * disk->bios_hd);
 102 #endif
 103 }
 104
 105 void
 106 All_FreeBSD(struct disk *d, int force_all)
 107 {
 108         struct chunk *c;
 109         int type;
 110
 111 #ifdef PC98
 112         type = 0xc494;
 113 #else
 114         type = 0xa5;
 115 #endif
 116
 117 again:
 118         for (c = d->chunks->part; c; c = c->next)
 119                 if (c->type != unused) {
 120                         Delete_Chunk(d, c);
 121                         goto again;
 122                 }
 123         c = d->chunks;
 124         if (force_all) {
 125                 Sanitize_Bios_Geom(d);
 126                 Create_Chunk(d, c->offset, c->size, freebsd, type,
 127                     CHUNK_FORCE_ALL, "FreeBSD");
 128         } else {
 129                 Create_Chunk(d, c->offset, c->size, freebsd, type, 0,
 130                     "FreeBSD");
 131         }
 132 }