arch/all-pc/boot/grub2-aros/grub-core/disk/host.c

   1 /* host.c - Dummy disk driver to provide access to the hosts filesystem  */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2007  Free Software Foundation, Inc.
   5  *
   6  *  GRUB is free software: you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation, either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  GRUB is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 /* When using the disk, make a reference to this module.  Otherwise
  21    the user will end up with a useless module :-).  */
  22
  23 #include <config.h>
  24 #include <config-util.h>
  25
  26 #include <grub/dl.h>
  27 #include <grub/disk.h>
  28 #include <grub/misc.h>
  29 #include <grub/emu/hostdisk.h>
  30
  31 int grub_disk_host_i_want_a_reference;
  32
  33 static int
  34 grub_host_iterate (grub_disk_dev_iterate_hook_t hook, void *hook_data,
  35                    grub_disk_pull_t pull)
  36 {
  37   if (pull != GRUB_DISK_PULL_NONE)
  38     return 0;
  39
  40   if (hook ("host", hook_data))
  41     return 1;
  42   return 0;
  43 }
  44
  45 static grub_err_t
  46 grub_host_open (const char *name, grub_disk_t disk)
  47 {
  48   if (grub_strcmp (name, "host"))
  49       return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "not a host disk");
  50
  51   disk->total_sectors = 0;
  52   disk->id = 0;
  53
  54   disk->data = 0;
  55
  56   return GRUB_ERR_NONE;
  57 }
  58
  59 static void
  60 grub_host_close (grub_disk_t disk __attribute((unused)))
  61 {
  62 }
  63
  64 static grub_err_t
  65 grub_host_read (grub_disk_t disk __attribute((unused)),
  66                 grub_disk_addr_t sector __attribute((unused)),
  67                 grub_size_t size __attribute((unused)),
  68                 char *buf __attribute((unused)))
  69 {
  70   return GRUB_ERR_OUT_OF_RANGE;
  71 }
  72
  73 static grub_err_t
  74 grub_host_write (grub_disk_t disk __attribute ((unused)),
  75                      grub_disk_addr_t sector __attribute ((unused)),
  76                      grub_size_t size __attribute ((unused)),
  77                      const char *buf __attribute ((unused)))
  78 {
  79   return GRUB_ERR_OUT_OF_RANGE;
  80 }
  81
  82 static struct grub_disk_dev grub_host_dev =
  83   {
  84     /* The only important line in this file :-) */
  85     .name = "host",
  86     .id = GRUB_DISK_DEVICE_HOST_ID,
  87     .iterate = grub_host_iterate,
  88     .open = grub_host_open,
  89     .close = grub_host_close,
  90     .read = grub_host_read,
  91     .write = grub_host_write,
  92     .next = 0
  93   };
  94
  95 GRUB_MOD_INIT(host)
  96 {
  97   grub_disk_dev_register (&grub_host_dev);
  98 }
  99
 100 GRUB_MOD_FINI(host)
 101 {
 102   grub_disk_dev_unregister (&grub_host_dev);
 103 }