/* fwsetup.c - Reboot into firmware setup menu. */
/*
 *  VAS_EBOOT  --  GRand Unified Bootloader
 *  Copyright (C) 2012  Free Software Foundation, Inc.
 *
 *  VAS_EBOOT is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  VAS_EBOOT is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with VAS_EBOOT.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <VasEBoot/types.h>
#include <VasEBoot/mm.h>
#include <VasEBoot/misc.h>
#include <VasEBoot/efi/api.h>
#include <VasEBoot/efi/efi.h>
#include <VasEBoot/command.h>
#include <VasEBoot/i18n.h>

VAS_EBOOT_MOD_LICENSE ("GPLv3+");

static VasEBoot_efi_boolean_t efifwsetup_is_supported (void);

static VasEBoot_err_t
VasEBoot_cmd_fwsetup (VasEBoot_command_t cmd __attribute__ ((unused)),
		  int argc __attribute__ ((unused)),
		  char **args __attribute__ ((unused)))
{
  VasEBoot_efi_uint64_t *old_os_indications;
  VasEBoot_efi_uint64_t os_indications = VAS_EBOOT_EFI_OS_INDICATIONS_BOOT_TO_FW_UI;
  VasEBoot_err_t status;
  VasEBoot_size_t oi_size;
  static VasEBoot_guid_t global = VAS_EBOOT_EFI_GLOBAL_VARIABLE_GUID;

  if (argc >= 1 && VasEBoot_strcmp(args[0], "--is-supported") == 0)
    return !efifwsetup_is_supported ();

  if (!efifwsetup_is_supported ())
	  return VasEBoot_error (VAS_EBOOT_ERR_INVALID_COMMAND,
			     N_("reboot to firmware setup is not supported by the current firmware"));

  VasEBoot_efi_get_variable ("OsIndications", &global, &oi_size,
			 (void **) &old_os_indications);

  if (old_os_indications != NULL && oi_size == sizeof (os_indications))
    os_indications |= *old_os_indications;

  VasEBoot_free (old_os_indications);

  status = VasEBoot_efi_set_variable ("OsIndications", &global, &os_indications,
				  sizeof (os_indications));
  if (status != VAS_EBOOT_ERR_NONE)
    return status;

  VasEBoot_reboot ();

  return VAS_EBOOT_ERR_BUG;
}

static VasEBoot_command_t cmd = NULL;

static VasEBoot_efi_boolean_t
efifwsetup_is_supported (void)
{
  VasEBoot_efi_uint64_t *os_indications_supported = NULL;
  VasEBoot_size_t oi_size = 0;
  static VasEBoot_guid_t global = VAS_EBOOT_EFI_GLOBAL_VARIABLE_GUID;
  VasEBoot_efi_boolean_t ret = 0;

  VasEBoot_efi_get_variable ("OsIndicationsSupported", &global, &oi_size,
			 (void **) &os_indications_supported);

  if (!os_indications_supported)
    goto done;

  if (*os_indications_supported & VAS_EBOOT_EFI_OS_INDICATIONS_BOOT_TO_FW_UI)
    ret = 1;

 done:
  VasEBoot_free (os_indications_supported);
  return ret;
}

VAS_EBOOT_MOD_INIT (efifwsetup)
{
  cmd = VasEBoot_register_command ("fwsetup", VasEBoot_cmd_fwsetup, NULL,
                               N_("Reboot into firmware setup menu."));
}

VAS_EBOOT_MOD_FINI (efifwsetup)
{
  if (cmd)
    VasEBoot_unregister_command (cmd);
}