efi_reboot.c

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/*
 * Copyright (C) 2013 Michael Brown <mbrown@fensystems.co.uk>.
 *
 * This program 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 2 of the
 * License, or any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 *
 * You can also choose to distribute this program under the terms of
 * the Unmodified Binary Distribution Licence (as given in the file
 * COPYING.UBDL), provided that you have satisfied its requirements.
 */

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
FILE_SECBOOT ( PERMITTED );

/**
 * @file
 *
 * EFI reboot mechanism
 *
 */

#include <errno.h>
#include <string.h>
#include <ipxe/efi/efi.h>
#include <ipxe/efi/Guid/GlobalVariable.h>
#include <ipxe/reboot.h>

/**
 * Reboot system
 *
 * @v flags             Reboot flags
 */
static void efi_reboot ( int flags ) {
        EFI_RUNTIME_SERVICES *rs = efi_systab->RuntimeServices;
        static CHAR16 wname[] = EFI_OS_INDICATIONS_VARIABLE_NAME;
        UINT64 osind;
        UINT32 attrs;
        EFI_RESET_TYPE type;
        EFI_STATUS efirc;
        int rc;

        /* Request boot to firmware setup, if applicable */
        if ( flags & REBOOT_SETUP ) {
                osind = EFI_OS_INDICATIONS_BOOT_TO_FW_UI;
                attrs = ( EFI_VARIABLE_BOOTSERVICE_ACCESS |
                          EFI_VARIABLE_RUNTIME_ACCESS |
                          EFI_VARIABLE_NON_VOLATILE );
                if ( ( efirc = rs->SetVariable ( wname, &efi_global_variable,
                                                 attrs, sizeof ( osind ),
                                                 &osind ) ) != 0 ) {
                        rc = -EEFI ( efirc );
                        DBGC ( efi_systab, "EFI could not set %ls: %s\n",
                               wname, strerror ( rc ) );
                        /* Continue to reboot anyway */
                }
        }

        /* Use runtime services to reset system */
        type = ( ( flags & REBOOT_WARM ) ? EfiResetWarm : EfiResetCold );
        rs->ResetSystem ( type, 0, 0, NULL );
}

/**
 * Power off system
 *
 * @ret rc              Return status code
 */
static int efi_poweroff ( void ) {
        EFI_RUNTIME_SERVICES *rs = efi_systab->RuntimeServices;

        /* Use runtime services to power off system */
        rs->ResetSystem ( EfiResetShutdown, 0, 0, NULL );

        /* Should never happen */
        return -ECANCELED;
}

PROVIDE_REBOOT ( efi, reboot, efi_reboot );
PROVIDE_REBOOT ( efi, poweroff, efi_poweroff );