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/** @file
Library that contains common parts of WdtPei and WdtDxe. Not a standalone module.
@copyright
Copyright (c) 2010 - 2012 Intel Corporation. All rights reserved
This software and associated documentation (if any) is furnished
under a license and may only be used or copied in accordance
with the terms of the license. Except as permitted by such
license, no part of this software or documentation may be
reproduced, stored in a retrieval system, or transmitted in any
form or by any means without the express written consent of
Intel Corporation.
This file contains an 'Intel Peripheral Driver' and uniquely
identified as "Intel Reference Module" and is
licensed for Intel CPUs and chipsets under the terms of your
license agreement with Intel or your vendor. This file may
be modified by the user, subject to additional terms of the
license agreement
**/
#include "PchAccess.h"
extern UINT8 mAllowExpectedReset;
extern EFI_GUID mWdtHobGuid;
#if !defined(EDK_RELEASE_VERSION) || (EDK_RELEASE_VERSION < 0x00020000)
#define WDT_HOB_GUID \
{ \
0x65675786, 0xacca, 0x4b11, 0x8a, 0xb7, 0xf8, 0x43, 0xaa, 0x2a, 0x8b, 0xea \
}
#else
#define WDT_HOB_GUID \
{ \
0x65675786, 0xacca, 0x4b11, \
{ \
0x8a, 0xb7, 0xf8, 0x43, 0xaa, 0x2a, 0x8b, 0xea \
} \
}
#endif
//
// HOB definitions duplicated from HOB.h which couldn't be included directly,
// because it requires either EdkIIGluePeim.h or EdkIIGlueDxe.h,
// and WdtCommon must not include any of those.
//
#ifndef _PEI_HOB_H_
#ifndef __HOB__H__
typedef struct _EFI_HOB_GENERIC_HEADER {
UINT16 HobType;
UINT16 HobLength;
UINT32 Reserved;
} EFI_HOB_GENERIC_HEADER;
typedef struct _EFI_HOB_GUID_TYPE {
EFI_HOB_GENERIC_HEADER Header;
EFI_GUID Name;
} EFI_HOB_GUID_TYPE;
#endif
#endif
typedef struct {
EFI_HOB_GUID_TYPE Header;
UINT16 TimeoutValue;
UINT8 Active;
} WDT_HOB;
/**
Reads LPC bridge to get Watchdog Timer address
@param[in] none
@retval UINT32 Watchdog's address
**/
UINT32
WdtGetAddress (
VOID
);
/**
Reloads WDT with new timeout value and starts it. Also sets Unexpected Reset bit, which
causes the next reset to be treated as watchdog expiration - unless AllowKnownReset()
function was called too.
@param[in] TimeoutValue Time in seconds before WDT times out. Supported range = 1 - 1024.
@retval EFI_SUCCESS if everything's OK
@retval EFI_INVALID_PARAMETER if TimeoutValue parameter is wrong
**/
EFI_STATUS
EFIAPI
WdtReloadAndStart (
IN UINT32 TimeoutValue
);
/**
Disables WDT timer.
@param[in] None
@retval None
**/
VOID
EFIAPI
WdtDisable (
VOID
);
/**
Returns WDT failure status.
@param[in] None
@retval V_PCH_OC_WDT_CTL_STATUS_FAILURE If there was WDT expiration or unexpected reset
@retval V_PCH_OC_WDT_CTL_STATUS_OK Otherwise
**/
UINT8
EFIAPI
WdtCheckStatus (
VOID
);
/**
Normally, each reboot performed while watchdog runs is considered a failure.
This function allows platform to perform expected reboots with WDT running,
without being interpreted as failures.
In DXE phase, it is enough to call this function any time before reset.
In PEI phase, between calling this function and performing reset, ReloadAndStart()
must not be called.
@param[in] None
@retval None
**/
VOID
EFIAPI
WdtAllowKnownReset (
VOID
);
/**
Returns information if WDT coverage for the duration of BIOS execution
was requested by an OS application
@param[in] None
@retval TRUE if WDT was requested
@retval FALSE if WDT was not requested
**/
UINT8
EFIAPI
IsWdtRequired (
VOID
);
/**
Returns WDT enabled/disabled status.
@param[in] None
@retval TRUE if WDT is enabled
@retval FALSE if WDT is disabled
**/
UINT8
EFIAPI
IsWdtEnabled (
VOID
);
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