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/*
* Copyright (C) 2015 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
*
* EFI watchdog holdoff timer
*
*/
#include <errno.h>
#include <string.h>
#include <ipxe/retry.h>
#include <ipxe/timer.h>
#include <ipxe/init.h>
#include <ipxe/efi/efi.h>
#include <ipxe/efi/efi_watchdog.h>
/** Watchdog holdoff interval (in seconds) */
#define WATCHDOG_HOLDOFF_SECS 10
/** Watchdog timeout (in seconds) */
#define WATCHDOG_TIMEOUT_SECS ( 5 * 60 )
/** Watchdog code (to be logged on watchdog timeout) */
#define WATCHDOG_CODE 0x6950584544454144ULL
/** Watchdog data (to be logged on watchdog timeout) */
#define WATCHDOG_DATA L"iPXE";
/**
* Hold off watchdog timer
*
* @v retry Retry timer
* @v over Failure indicator
*/
static void efi_watchdog_expired ( struct retry_timer *timer,
int over __unused ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
static CHAR16 data[] = WATCHDOG_DATA;
EFI_STATUS efirc;
int rc;
DBGC2 ( timer, "EFI holding off watchdog timer\n" );
/* Restart this holdoff timer */
start_timer_fixed ( timer, ( WATCHDOG_HOLDOFF_SECS * TICKS_PER_SEC ) );
/* Reset watchdog timer */
if ( ( efirc = bs->SetWatchdogTimer ( WATCHDOG_TIMEOUT_SECS,
WATCHDOG_CODE, sizeof ( data ),
data ) ) != 0 ) {
rc = -EEFI ( efirc );
DBGC ( timer, "EFI could not set watchdog timer: %s\n",
strerror ( rc ) );
return;
}
}
/** Watchdog holdoff timer */
struct retry_timer efi_watchdog = TIMER_INIT ( efi_watchdog_expired );
/**
* Disable watching when shutting down to boot an operating system
*
* @v booting System is shutting down for OS boot
*/
static void efi_watchdog_shutdown ( int booting ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
EFI_STATUS efirc;
int rc;
/* If we are shutting down to boot an operating system, then
* disable the boot services watchdog timer. The UEFI
* specification mandates that the platform firmware does this
* as part of the ExitBootServices() call, but some platforms
* (e.g. Hyper-V) are observed to occasionally forget to do
* so, resulting in a reboot approximately five minutes after
* starting the operating system.
*/
if ( booting &&
( ( efirc = bs->SetWatchdogTimer ( 0, 0, 0, NULL ) ) != 0 ) ) {
rc = -EEFI ( efirc );
DBGC ( &efi_watchdog, "EFI could not disable watchdog timer: "
"%s\n", strerror ( rc ) );
/* Nothing we can do */
}
}
/** Watchdog startup/shutdown function */
struct startup_fn efi_watchdog_startup_fn __startup_fn ( STARTUP_EARLY ) = {
.name = "efi_watchdog",
.shutdown = efi_watchdog_shutdown,
};
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