audk/MdeModulePkg/Core/Dxe/Misc/SetWatchdogTimer.c

/** @file
  UEFI Miscellaneous boot Services SetWatchdogTimer service implementation

Copyright (c) 2006 - 2008, Intel Corporation. <BR>
All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution.  The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php

THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#include <DxeMain.h>

#define WATCHDOG_TIMER_CALIBRATE_PER_SECOND 10000000

/**
  Sets the system's watchdog timer.

  @param  Timeout         The number of seconds to set the watchdog timer to.
                          A value of zero disables the timer.
  @param  WatchdogCode    The numeric code to log on a watchdog timer timeout
                          event. The firmware reserves codes 0x0000 to 0xFFFF.
                          Loaders and operating systems may use other timeout
                          codes.
  @param  DataSize        The size, in bytes, of WatchdogData.
  @param  WatchdogData    A data buffer that includes a Null-terminated Unicode
                          string, optionally followed by additional binary data.
                          The string is a description that the call may use to
                          further indicate the reason to be logged with a
                          watchdog event.

  @return EFI_SUCCESS               Timeout has been set
  @return EFI_NOT_AVAILABLE_YET     WatchdogTimer is not available yet
  @return EFI_UNSUPPORTED           System does not have a timer (currently not used)
  @return EFI_DEVICE_ERROR          Could not complete due to hardware error

**/
EFI_STATUS
EFIAPI
CoreSetWatchdogTimer (
  IN UINTN    Timeout,
  IN UINT64   WatchdogCode,
  IN UINTN    DataSize,
  IN CHAR16   *WatchdogData OPTIONAL
  )
{
  EFI_STATUS  Status;

  //
  // Check our architectural protocol
  //
  if (gWatchdogTimer == NULL) {
    return EFI_NOT_AVAILABLE_YET;
  }

  //
  // Attempt to set the timeout
  //
  Status = gWatchdogTimer->SetTimerPeriod (gWatchdogTimer, MultU64x32 (Timeout, WATCHDOG_TIMER_CALIBRATE_PER_SECOND));

  //
  // Check for errors
  //
  if (EFI_ERROR (Status)) {
    return EFI_DEVICE_ERROR;
  }

  return EFI_SUCCESS;
}