arch/all-pc/boot/grub2-aros/grub-core/loader/i386/pc/ntldr.c

   1 /* chainloader.c - boot another boot loader */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2002,2004,2007,2009,2010  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 #include <grub/loader.h>
  21 #include <grub/file.h>
  22 #include <grub/err.h>
  23 #include <grub/device.h>
  24 #include <grub/disk.h>
  25 #include <grub/misc.h>
  26 #include <grub/types.h>
  27 #include <grub/partition.h>
  28 #include <grub/dl.h>
  29 #include <grub/command.h>
  30 #include <grub/machine/biosnum.h>
  31 #include <grub/i18n.h>
  32 #include <grub/video.h>
  33 #include <grub/mm.h>
  34 #include <grub/cpu/relocator.h>
  35 #include <grub/machine/chainloader.h>
  36
  37 GRUB_MOD_LICENSE ("GPLv3+");
  38
  39 static grub_dl_t my_mod;
  40 static struct grub_relocator *rel;
  41 static grub_uint32_t edx = 0xffffffff;
  42
  43 #define GRUB_NTLDR_SEGMENT         0x2000
  44
  45 static grub_err_t
  46 grub_ntldr_boot (void)
  47 {
  48   struct grub_relocator16_state state = {
  49     .cs = GRUB_NTLDR_SEGMENT,
  50     .ip = 0,
  51     .ds = 0,
  52     .es = 0,
  53     .fs = 0,
  54     .gs = 0,
  55     .ss = 0,
  56     .sp = 0x7c00,
  57     .edx = edx,
  58     .a20 = 1
  59   };
  60   grub_video_set_mode ("text", 0, 0);
  61
  62   return grub_relocator16_boot (rel, state);
  63 }
  64
  65 static grub_err_t
  66 grub_ntldr_unload (void)
  67 {
  68   grub_relocator_unload (rel);
  69   rel = NULL;
  70   grub_dl_unref (my_mod);
  71   return GRUB_ERR_NONE;
  72 }
  73
  74 static grub_err_t
  75 grub_cmd_ntldr (grub_command_t cmd __attribute__ ((unused)),
  76                 int argc, char *argv[])
  77 {
  78   grub_file_t file = 0;
  79   grub_err_t err;
  80   void *bs, *ntldr;
  81   grub_size_t ntldrsize;
  82   grub_device_t dev;
  83
  84   if (argc == 0)
  85     return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
  86
  87   grub_dl_ref (my_mod);
  88
  89   rel = grub_relocator_new ();
  90   if (!rel)
  91     goto fail;
  92
  93   file = grub_file_open (argv[0]);
  94   if (! file)
  95     goto fail;
  96
  97   {
  98     grub_relocator_chunk_t ch;
  99     err = grub_relocator_alloc_chunk_addr (rel, &ch, 0x7C00,
 100                                            GRUB_DISK_SECTOR_SIZE);
 101     if (err)
 102       goto fail;
 103     bs = get_virtual_current_address (ch);
 104   }
 105
 106   edx = grub_get_root_biosnumber ();
 107   dev = grub_device_open (0);
 108
 109   if (dev && dev->disk)
 110     {
 111       err = grub_disk_read (dev->disk, 0, 0, GRUB_DISK_SECTOR_SIZE, bs);
 112       if (err)
 113         {
 114           grub_device_close (dev);
 115           goto fail;
 116         }
 117       grub_chainloader_patch_bpb (bs, dev, edx);
 118     }
 119
 120   if (dev)
 121     grub_device_close (dev);
 122
 123   ntldrsize = grub_file_size (file);
 124   {
 125     grub_relocator_chunk_t ch;
 126     err = grub_relocator_alloc_chunk_addr (rel, &ch, GRUB_NTLDR_SEGMENT << 4,
 127                                            ntldrsize);
 128     if (err)
 129       goto fail;
 130     ntldr = get_virtual_current_address (ch);
 131   }
 132
 133   if (grub_file_read (file, ntldr, ntldrsize)
 134       != (grub_ssize_t) ntldrsize)
 135     goto fail;
 136
 137   grub_loader_set (grub_ntldr_boot, grub_ntldr_unload, 1);
 138   return GRUB_ERR_NONE;
 139
 140  fail:
 141
 142   if (file)
 143     grub_file_close (file);
 144
 145   grub_ntldr_unload ();
 146
 147   return grub_errno;
 148 }
 149
 150 static grub_command_t cmd;
 151
 152 GRUB_MOD_INIT(ntldr)
 153 {
 154   cmd = grub_register_command ("ntldr", grub_cmd_ntldr,
 155                                0, N_("Load NTLDR or BootMGR."));
 156   my_mod = mod;
 157 }
 158
 159 GRUB_MOD_FINI(ntldr)
 160 {
 161   grub_unregister_command (cmd);
 162 }