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/** @file
Implementation file for Watchdog Timer functionality
@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
**/
#if !defined(EDK_RELEASE_VERSION) || (EDK_RELEASE_VERSION < 0x00020000)
#include "EdkIIGlueDxe.h"
#endif
#include EFI_PROTOCOL_CONSUMER (PchReset)
#include "WdtCommon.h"
#include EFI_PROTOCOL_PRODUCER (Wdt)
VOID
EFIAPI
WdtRunBeforeOsBoot (
IN EFI_EVENT Event,
IN VOID *Context
);
EFI_STATUS
EFIAPI
WdtPchResetCallback (
IN PCH_RESET_TYPE PchResetType
);
#define TIMEOUT_AFTER_POST_MULTIPLIER 16
#define MINIMUM_TIMEOUT_AT_S4_EXIT 600 ///< 10 minutes
EFI_HANDLE mImageHandle;
WDT_PROTOCOL mWdtProtocol = {
WdtReloadAndStart,
WdtCheckStatus,
WdtDisable,
WdtAllowKnownReset,
IsWdtRequired,
IsWdtEnabled
};
PCH_RESET_CALLBACK_PROTOCOL mPchResetCallbackProtocol = { WdtPchResetCallback };
/**
Installs WDT protocol.
Registers a function to be executed just before booting to OS.
@param[in] ImageHandle Image handle for this driver image
@param[in] SystemTable Pointer to the EFI System Table
@retval EFI_SUCCESS WDT DXE driver initialization completed successfully
**/
EFI_STATUS
WdtDxeEntryPoint (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
EFI_EVENT Event;
DEBUG ((EFI_D_INFO, "(Wdt) Entry Point to WdtDxe\n"));
mImageHandle = ImageHandle;
Status = gBS->CreateEvent (
EVENT_SIGNAL_EXIT_BOOT_SERVICES,
EFI_TPL_CALLBACK,
WdtRunBeforeOsBoot,
NULL,
&Event
);
ASSERT_EFI_ERROR (Status);
Status = EfiCreateEventLegacyBootEx (
EFI_TPL_CALLBACK,
WdtRunBeforeOsBoot,
NULL,
&Event
);
ASSERT_EFI_ERROR (Status);
DEBUG ((EFI_D_INFO, "(Wdt) WDT event registration; Status = %r\n", Status));
Status = gBS->InstallProtocolInterface (
&ImageHandle,
&gWdtProtocolGuid,
EFI_NATIVE_INTERFACE,
&mWdtProtocol
);
ASSERT_EFI_ERROR (Status);
Status = gBS->InstallProtocolInterface (
&ImageHandle,
&gPchResetCallbackProtocolGuid,
EFI_NATIVE_INTERFACE,
&mPchResetCallbackProtocol
);
ASSERT_EFI_ERROR (Status);
return EFI_SUCCESS;
}
/**
Turns on watchdog timer just before booting to OS, if an OS application requested that.
Clears request status.
Uninstalls Wdt protocol to prevent other modules from interfering with actions described above.
@param[in] Event useless here, but required in functions invoked by events
@param[in] Context useless here, but required in functions invoked by events
@retval None
**/
VOID
EFIAPI
WdtRunBeforeOsBoot (
IN EFI_EVENT Event,
IN VOID *Context
)
{
UINT32 ReloadValue;
UINT32 Readback;
EFI_STATUS Status;
EFI_BOOT_MODE BootMode;
EFI_PEI_HOB_POINTERS HobList;
WDT_HOB *WdtHob;
gBS->CloseEvent (Event);
DEBUG ((EFI_D_INFO, "(Wdt) RunWdtBeforeOsBoot\n"));
Status = gBS->UninstallProtocolInterface (
mImageHandle,
&gWdtProtocolGuid,
&mWdtProtocol
);
Status = gBS->UninstallProtocolInterface (
mImageHandle,
&gPchResetCallbackProtocolGuid,
&mPchResetCallbackProtocol
);
///
/// check boot type, there are different flows for S4/S5
///
EfiGetSystemConfigurationTable (&gEfiHobListGuid, (VOID **) &HobList.Raw);
if (HobList.Header->HobType != EFI_HOB_TYPE_HANDOFF) {
DEBUG ((EFI_D_ERROR, "(Wdt) Handoff Hob missing!\n"));
return;
}
BootMode = HobList.HandoffInformationTable->BootMode;
WdtHob = GetFirstGuidHob (&mWdtHobGuid);
if (WdtHob == NULL) {
return;
}
Readback = IoRead32 (WdtGetAddress ());
ReloadValue = TIMEOUT_AFTER_POST_MULTIPLIER * ((Readback & B_PCH_OC_WDT_CTL_AFTER_POST) >> 16);
if (BootMode == BOOT_ON_S4_RESUME) {
///
/// S4 resume: if WDT was enabled before S0->S4 transition,
/// then WDT must be turned on even though TimeoutValueAfterPost == 0
/// unlike in S5->S0 flow, ToVaP is not set to zero after being consumed
///
if (WdtHob->Active == 1) {
if (ReloadValue != 0) {
WdtReloadAndStart (ReloadValue);
} else {
WdtReloadAndStart (MINIMUM_TIMEOUT_AT_S4_EXIT);
}
} else {
WdtDisable ();
}
} else if (ReloadValue != 0) {
///
/// start WDT with TimeoutValueAfterPost and clear that value from register
///
Readback &= ~(B_PCH_OC_WDT_CTL_AFTER_POST);
IoWrite32 (WdtGetAddress (), Readback);
WdtReloadAndStart (ReloadValue);
} else {
WdtDisable ();
}
return;
}
/**
WDT call back function for Pch Reset.
@param[in] PchResetType Pch Reset Types which includes PowerCycle, Globalreset.
@retval EFI_SUCCESS The function completed successfully
@retval Others All other error conditions encountered result in an ASSERT.
**/
EFI_STATUS
EFIAPI
WdtPchResetCallback (
IN PCH_RESET_TYPE PchResetType
)
{
WdtAllowKnownReset ();
return EFI_SUCCESS;
}
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