grub-core/commands/efi/efifwsetup.c

   1 /* fwsetup.c - Reboot into firmware setup menu. */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2012  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/types.h>
  21 #include <grub/mm.h>
  22 #include <grub/misc.h>
  23 #include <grub/efi/api.h>
  24 #include <grub/efi/efi.h>
  25 #include <grub/command.h>
  26 #include <grub/i18n.h>
  27
  28 GRUB_MOD_LICENSE ("GPLv3+");
  29
  30 static grub_err_t
  31 grub_cmd_fwsetup (grub_command_t cmd __attribute__ ((unused)),
  32                   int argc __attribute__ ((unused)),
  33                   char **args __attribute__ ((unused)))
  34 {
  35   grub_efi_uint64_t *old_os_indications;
  36   grub_efi_uint64_t os_indications = GRUB_EFI_OS_INDICATIONS_BOOT_TO_FW_UI;
  37   grub_err_t status;
  38   grub_size_t oi_size;
  39   grub_efi_guid_t global = GRUB_EFI_GLOBAL_VARIABLE_GUID;
  40
  41   old_os_indications = grub_efi_get_variable ("OsIndications", &global,
  42                                               &oi_size);
  43
  44   if (old_os_indications != NULL && oi_size == sizeof (os_indications))
  45     os_indications |= *old_os_indications;
  46
  47   status = grub_efi_set_variable ("OsIndications", &global, &os_indications,
  48                                   sizeof (os_indications));
  49   if (status != GRUB_ERR_NONE)
  50     return status;
  51
  52   grub_reboot ();
  53
  54   return GRUB_ERR_BUG;
  55 }
  56
  57 static grub_command_t cmd = NULL;
  58
  59 static grub_efi_boolean_t
  60 efifwsetup_is_supported (void)
  61 {
  62   grub_efi_uint64_t *os_indications_supported = NULL;
  63   grub_size_t oi_size = 0;
  64   grub_efi_guid_t global = GRUB_EFI_GLOBAL_VARIABLE_GUID;
  65
  66   os_indications_supported = grub_efi_get_variable ("OsIndicationsSupported",
  67                                                     &global, &oi_size);
  68
  69   if (!os_indications_supported)
  70     return 0;
  71
  72   if (*os_indications_supported & GRUB_EFI_OS_INDICATIONS_BOOT_TO_FW_UI)
  73     return 1;
  74
  75   return 0;
  76 }
  77
  78 GRUB_MOD_INIT (efifwsetup)
  79 {
  80   if (efifwsetup_is_supported ())
  81     cmd = grub_register_command ("fwsetup", grub_cmd_fwsetup, NULL,
  82                                  N_("Reboot into firmware setup menu."));
  83
  84 }
  85
  86 GRUB_MOD_FINI (efifwsetup)
  87 {
  88   if (cmd)
  89     grub_unregister_command (cmd);
  90 }