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/** @file
A helper driver to save information to SMRAM after SMRR is enabled.
This driver is for ECP platforms.
Copyright (c) 2010 - 2015, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <PiSmm.h>
#include <Library/DebugLib.h>
#include <Library/UefiDriverEntryPoint.h>
#include <Library/UefiRuntimeServicesTableLib.h>
#include <Library/SmmServicesTableLib.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/IoLib.h>
#include <Protocol/SmmSwDispatch.h>
#include <Protocol/SmmReadyToLock.h>
#include <Protocol/SmmControl.h>
#include <Guid/Vlv2DeviceRefCodePkgTokenSpace.h>
#define SMM_FROM_SMBASE_DRIVER 0x55
#define SMM_FROM_CPU_DRIVER_SAVE_INFO 0x81
#define EFI_SMRAM_CPU_NVS_HEADER_GUID \
{ \
0x429501d9, 0xe447, 0x40f4, 0x86, 0x7b, 0x75, 0xc9, 0x3a, 0x1d, 0xb5, 0x4e \
}
UINT8 mSmiDataRegister;
BOOLEAN mLocked = FALSE;
EFI_GUID mSmramCpuNvsHeaderGuid = EFI_SMRAM_CPU_NVS_HEADER_GUID;
/**
Dispatch function for a Software SMI handler.
@param DispatchHandle The handle of this dispatch function.
@param DispatchContext The pointer to the dispatch function's context.
The SwSmiInputValue field is filled in
by the software dispatch driver prior to
invoking this dispatch function.
The dispatch function will only be called
for input values for which it is registered.
@return None
**/
VOID
EFIAPI
SmramSaveInfoHandler (
IN EFI_HANDLE DispatchHandle,
IN EFI_SMM_SW_DISPATCH_CONTEXT *DispatchContext
)
{
ASSERT (DispatchContext != NULL);
ASSERT (DispatchContext->SwSmiInputValue == SMM_FROM_SMBASE_DRIVER);
if (!mLocked && IoRead8 (mSmiDataRegister) == SMM_FROM_CPU_DRIVER_SAVE_INFO) {
CopyMem (
(VOID *)(UINTN)(PcdGetEx64 (&gEfiVLVTokenSpaceGuid, PcdCpuLockBoxDataAddress)),
(VOID *)(UINTN)(PcdGetEx64 (&gEfiVLVTokenSpaceGuid, PcdCpuSmramCpuDataAddress)),
(UINTN)(PcdGetEx64 (&gEfiVLVTokenSpaceGuid, PcdCpuLockBoxSize))
);
}
}
/**
Smm Ready To Lock event notification handler.
It sets a flag indicating that SMRAM has been locked.
@param[in] Protocol Points to the protocol's unique identifier.
@param[in] Interface Points to the interface instance.
@param[in] Handle The handle on which the interface was installed.
@retval EFI_SUCCESS Notification handler runs successfully.
**/
EFI_STATUS
EFIAPI
SmmReadyToLockEventNotify (
IN CONST EFI_GUID *Protocol,
IN VOID *Interface,
IN EFI_HANDLE Handle
)
{
mLocked = TRUE;
return EFI_SUCCESS;
}
/**
Entry point function of this driver.
@param[in] ImageHandle The firmware allocated handle for the EFI image.
@param[in] SystemTable A pointer to the EFI System Table.
@retval EFI_SUCCESS The entry point is executed successfully.
@retval other Some error occurs when executing this entry point.
**/
EFI_STATUS
EFIAPI
SmramSaveInfoHandlerSmmMain (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
EFI_SMM_SW_DISPATCH_PROTOCOL *SmmSwDispatch;
EFI_SMM_SW_DISPATCH_CONTEXT SmmSwDispatchContext;
EFI_HANDLE DispatchHandle;
EFI_SMM_CONTROL_PROTOCOL *SmmControl;
EFI_SMM_CONTROL_REGISTER SmmControlRegister;
VOID *Registration;
//
// Get SMI data register
//
Status = SystemTable->BootServices->LocateProtocol (
&gEfiSmmControlProtocolGuid,
NULL,
(VOID **)&SmmControl
);
ASSERT_EFI_ERROR (Status);
Status = SmmControl->GetRegisterInfo (SmmControl, &SmmControlRegister);
ASSERT_EFI_ERROR (Status);
mSmiDataRegister = SmmControlRegister.SmiDataRegister;
//
// Register software SMI handler
//
Status = SystemTable->BootServices->LocateProtocol (
&gEfiSmmSwDispatchProtocolGuid,
NULL,
(VOID **)&SmmSwDispatch
);
ASSERT_EFI_ERROR (Status);
SmmSwDispatchContext.SwSmiInputValue = SMM_FROM_SMBASE_DRIVER;
Status = SmmSwDispatch->Register (
SmmSwDispatch,
&SmramSaveInfoHandler,
&SmmSwDispatchContext,
&DispatchHandle
);
ASSERT_EFI_ERROR (Status);
//
// Register SMM Ready To Lock Protocol notification
//
Status = gSmst->SmmRegisterProtocolNotify (
&gEfiSmmReadyToLockProtocolGuid,
SmmReadyToLockEventNotify,
&Registration
);
ASSERT_EFI_ERROR (Status);
return Status;
}
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