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audk/EdkCompatibilityPkg/Compatibility/SmmBaseHelper/SmmBaseHelper.c

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/** @file
SMM Base Helper SMM driver.
This driver is the counterpart of the SMM Base On SMM Base2 Thunk driver. It
provides helping services in SMM to the SMM Base On SMM Base2 Thunk driver.
Copyright (c) 2009 - 2010, Intel Corporation
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 <PiSmm.h>
#include <Library/DebugLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/SmmServicesTableLib.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/PeCoffLib.h>
#include <Library/DevicePathLib.h>
#include <Library/CacheMaintenanceLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Guid/SmmBaseThunkCommunication.h>
#include <Protocol/SmmBaseHelperReady.h>
#include <Protocol/SmmCpu.h>
#include <Protocol/LoadedImage.h>
#include <Protocol/SmmCpuSaveState.h>
#include <Protocol/MpService.h>
#include <Protocol/LoadPe32Image.h>
///
/// Structure for tracking paired information of registered Framework SMI handler
/// and correpsonding dispatch handle for SMI handler thunk.
///
typedef struct {
LIST_ENTRY Link;
EFI_HANDLE DispatchHandle;
EFI_HANDLE SmmImageHandle;
EFI_SMM_CALLBACK_ENTRY_POINT CallbackAddress;
} CALLBACK_INFO;
typedef struct {
///
/// PI SMM CPU Save State register index
///
EFI_SMM_SAVE_STATE_REGISTER Register;
///
/// Offset in Framework SMST
///
UINTN Offset;
} CPU_SAVE_STATE_CONVERSION;
#define CPU_SAVE_STATE_GET_OFFSET(Field) (UINTN)(&(((EFI_SMM_CPU_SAVE_STATE *) 0)->Ia32SaveState.Field))
EFI_HANDLE mDispatchHandle;
EFI_SMM_CPU_PROTOCOL *mSmmCpu;
EFI_PE32_IMAGE_PROTOCOL *mLoadPe32Image;
EFI_GUID mEfiSmmCpuIoGuid = EFI_SMM_CPU_IO_GUID;
EFI_SMM_BASE_HELPER_READY_PROTOCOL *mSmmBaseHelperReady;
EFI_SMM_SYSTEM_TABLE *mFrameworkSmst;
UINTN mNumberOfProcessors;
LIST_ENTRY mCallbackInfoListHead = INITIALIZE_LIST_HEAD_VARIABLE (mCallbackInfoListHead);
CPU_SAVE_STATE_CONVERSION mCpuSaveStateConvTable[] = {
{EFI_SMM_SAVE_STATE_REGISTER_LDTBASE , CPU_SAVE_STATE_GET_OFFSET(LDTBase)},
{EFI_SMM_SAVE_STATE_REGISTER_ES , CPU_SAVE_STATE_GET_OFFSET(ES)},
{EFI_SMM_SAVE_STATE_REGISTER_CS , CPU_SAVE_STATE_GET_OFFSET(CS)},
{EFI_SMM_SAVE_STATE_REGISTER_SS , CPU_SAVE_STATE_GET_OFFSET(SS)},
{EFI_SMM_SAVE_STATE_REGISTER_DS , CPU_SAVE_STATE_GET_OFFSET(DS)},
{EFI_SMM_SAVE_STATE_REGISTER_FS , CPU_SAVE_STATE_GET_OFFSET(FS)},
{EFI_SMM_SAVE_STATE_REGISTER_GS , CPU_SAVE_STATE_GET_OFFSET(GS)},
{EFI_SMM_SAVE_STATE_REGISTER_TR_SEL , CPU_SAVE_STATE_GET_OFFSET(TR)},
{EFI_SMM_SAVE_STATE_REGISTER_DR7 , CPU_SAVE_STATE_GET_OFFSET(DR7)},
{EFI_SMM_SAVE_STATE_REGISTER_DR6 , CPU_SAVE_STATE_GET_OFFSET(DR6)},
{EFI_SMM_SAVE_STATE_REGISTER_RAX , CPU_SAVE_STATE_GET_OFFSET(EAX)},
{EFI_SMM_SAVE_STATE_REGISTER_RBX , CPU_SAVE_STATE_GET_OFFSET(EBX)},
{EFI_SMM_SAVE_STATE_REGISTER_RCX , CPU_SAVE_STATE_GET_OFFSET(ECX)},
{EFI_SMM_SAVE_STATE_REGISTER_RDX , CPU_SAVE_STATE_GET_OFFSET(EDX)},
{EFI_SMM_SAVE_STATE_REGISTER_RSP , CPU_SAVE_STATE_GET_OFFSET(ESP)},
{EFI_SMM_SAVE_STATE_REGISTER_RBP , CPU_SAVE_STATE_GET_OFFSET(EBP)},
{EFI_SMM_SAVE_STATE_REGISTER_RSI , CPU_SAVE_STATE_GET_OFFSET(ESI)},
{EFI_SMM_SAVE_STATE_REGISTER_RDI , CPU_SAVE_STATE_GET_OFFSET(EDI)},
{EFI_SMM_SAVE_STATE_REGISTER_RIP , CPU_SAVE_STATE_GET_OFFSET(EIP)},
{EFI_SMM_SAVE_STATE_REGISTER_RFLAGS , CPU_SAVE_STATE_GET_OFFSET(EFLAGS)},
{EFI_SMM_SAVE_STATE_REGISTER_CR0 , CPU_SAVE_STATE_GET_OFFSET(CR0)},
{EFI_SMM_SAVE_STATE_REGISTER_CR3 , CPU_SAVE_STATE_GET_OFFSET(CR3)}
};
/**
Framework SMST SmmInstallConfigurationTable() Thunk.
This thunk calls the PI SMM SmmInstallConfigurationTable() and then update the configuration
table related fields in the Framework SMST because the PI SMM SmmInstallConfigurationTable()
function may modify these fields.
@param[in] SystemTable A pointer to the SMM System Table.
@param[in] Guid A pointer to the GUID for the entry to add, update, or remove.
@param[in] Table A pointer to the buffer of the table to add.
@param[in] TableSize The size of the table to install.
@retval EFI_SUCCESS The (Guid, Table) pair was added, updated, or removed.
@retval EFI_INVALID_PARAMETER Guid is not valid.
@retval EFI_NOT_FOUND An attempt was made to delete a non-existent entry.
@retval EFI_OUT_OF_RESOURCES There is not enough memory available to complete the operation.
**/
EFI_STATUS
EFIAPI
SmmInstallConfigurationTable (
IN EFI_SMM_SYSTEM_TABLE *SystemTable,
IN EFI_GUID *Guid,
IN VOID *Table,
IN UINTN TableSize
)
{
EFI_STATUS Status;
Status = gSmst->SmmInstallConfigurationTable (gSmst, Guid, Table, TableSize);
if (!EFI_ERROR (Status)) {
mFrameworkSmst->NumberOfTableEntries = gSmst->NumberOfTableEntries;
mFrameworkSmst->SmmConfigurationTable = gSmst->SmmConfigurationTable;
}
return Status;
}
/**
Construct a Framework SMST based on the PI SMM SMST.
@return Pointer to the constructed Framework SMST.
**/
EFI_SMM_SYSTEM_TABLE *
ConstructFrameworkSmst (
VOID
)
{
EFI_SMM_SYSTEM_TABLE *FrameworkSmst;
FrameworkSmst = (EFI_SMM_SYSTEM_TABLE *)AllocatePool (sizeof (EFI_SMM_SYSTEM_TABLE));
ASSERT (FrameworkSmst != NULL);
///
/// Copy same things from PI SMST to Framework SMST
///
CopyMem (FrameworkSmst, gSmst, (UINTN)(&((EFI_SMM_SYSTEM_TABLE *)0)->SmmIo));
CopyMem (
&FrameworkSmst->SmmIo,
&gSmst->SmmIo,
sizeof (EFI_SMM_SYSTEM_TABLE) - (UINTN)(&((EFI_SMM_SYSTEM_TABLE *)0)->SmmIo)
);
///
/// Update Framework SMST
///
FrameworkSmst->Hdr.Revision = EFI_SMM_SYSTEM_TABLE_REVISION;
CopyGuid (&FrameworkSmst->EfiSmmCpuIoGuid, &mEfiSmmCpuIoGuid);
FrameworkSmst->CpuSaveState = (EFI_SMM_CPU_SAVE_STATE *)AllocateZeroPool (mNumberOfProcessors * sizeof (EFI_SMM_CPU_SAVE_STATE));
ASSERT (FrameworkSmst->CpuSaveState != NULL);
///
/// Do not support floating point state now
///
FrameworkSmst->CpuOptionalFloatingPointState = NULL;
FrameworkSmst->SmmInstallConfigurationTable = SmmInstallConfigurationTable;
return FrameworkSmst;
}
/**
Load a given Framework SMM driver into SMRAM and invoke its entry point.
@param[in] ParentImageHandle Parent Image Handle.
@param[in] FilePath Location of the image to be installed as the handler.
@param[in] SourceBuffer Optional source buffer in case the image file
is in memory.
@param[in] SourceSize Size of the source image file, if in memory.
@param[out] ImageHandle The handle that the base driver uses to decode
the handler. Unique among SMM handlers only,
not unique across DXE/EFI.
@retval EFI_SUCCESS The operation was successful.
@retval EFI_OUT_OF_RESOURCES There were no additional SMRAM resources to load the handler
@retval EFI_UNSUPPORTED Can not find its copy in normal memory.
@retval EFI_INVALID_PARAMETER The handlers was not the correct image type
**/
EFI_STATUS
LoadImage (
IN EFI_HANDLE ParentImageHandle,
IN EFI_DEVICE_PATH_PROTOCOL *FilePath,
IN VOID *SourceBuffer,
IN UINTN SourceSize,
OUT EFI_HANDLE *ImageHandle
)
{
EFI_STATUS Status;
UINTN PageCount;
UINTN OrgPageCount;
EFI_PHYSICAL_ADDRESS DstBuffer;
if (FilePath == NULL || ImageHandle == NULL) {
return EFI_INVALID_PARAMETER;
}
PageCount = 1;
do {
OrgPageCount = PageCount;
DstBuffer = (UINTN)-1;
Status = gSmst->SmmAllocatePages (
AllocateMaxAddress,
EfiRuntimeServicesCode,
PageCount,
&DstBuffer
);
if (EFI_ERROR (Status)) {
return Status;
}
Status = mLoadPe32Image->LoadPeImage (
mLoadPe32Image,
ParentImageHandle,
FilePath,
SourceBuffer,
SourceSize,
DstBuffer,
&PageCount,
ImageHandle,
NULL,
EFI_LOAD_PE_IMAGE_ATTRIBUTE_NONE
);
if (EFI_ERROR (Status)) {
FreePages ((VOID *)(UINTN)DstBuffer, OrgPageCount);
}
} while (Status == EFI_BUFFER_TOO_SMALL);
if (!EFI_ERROR (Status)) {
///
/// Update MP state in Framework SMST before transferring control to Framework SMM driver entry point
/// in case it may invoke AP
///
mFrameworkSmst->CurrentlyExecutingCpu = gSmst->CurrentlyExecutingCpu;
Status = gBS->StartImage (*ImageHandle, NULL, NULL);
if (EFI_ERROR (Status)) {
mLoadPe32Image->UnLoadPeImage (mLoadPe32Image, *ImageHandle);
*ImageHandle = NULL;
FreePages ((VOID *)(UINTN)DstBuffer, PageCount);
}
}
return Status;
}
/**
Thunk service of EFI_SMM_BASE_PROTOCOL.Register().
@param[in, out] FunctionData Pointer to SMMBASE_FUNCTION_DATA.
**/
VOID
Register (
IN OUT SMMBASE_FUNCTION_DATA *FunctionData
)
{
EFI_STATUS Status;
if (FunctionData->Args.Register.LegacyIA32Binary) {
Status = EFI_UNSUPPORTED;
} else {
Status = LoadImage (
FunctionData->SmmBaseImageHandle,
FunctionData->Args.Register.FilePath,
FunctionData->Args.Register.SourceBuffer,
FunctionData->Args.Register.SourceSize,
FunctionData->Args.Register.ImageHandle
);
}
FunctionData->Status = Status;
}
/**
Thunk service of EFI_SMM_BASE_PROTOCOL.UnRegister().
@param[in, out] FunctionData Pointer to SMMBASE_FUNCTION_DATA.
**/
VOID
UnRegister (
IN OUT SMMBASE_FUNCTION_DATA *FunctionData
)
{
///
/// Unregister not supported now
///
FunctionData->Status = EFI_UNSUPPORTED;
}
/**
Search for Framework SMI handler information according to specific PI SMM dispatch handle.
@param[in] DispatchHandle The unique handle assigned by SmiHandlerRegister().
@return Pointer to CALLBACK_INFO. If NULL, no callback info record is found.
**/
CALLBACK_INFO *
GetCallbackInfo (
IN EFI_HANDLE DispatchHandle
)
{
LIST_ENTRY *Node;
Node = GetFirstNode (&mCallbackInfoListHead);
while (!IsNull (&mCallbackInfoListHead, Node)) {
if (((CALLBACK_INFO *)Node)->DispatchHandle == DispatchHandle) {
return (CALLBACK_INFO *)Node;
}
Node = GetNextNode (&mCallbackInfoListHead, Node);
}
return NULL;
}
/**
Callback thunk for Framework SMI handler.
This thunk functions calls the Framework SMI handler and converts the return value
defined from Framework SMI handlers to a correpsonding return value defined by PI SMM.
@param[in] DispatchHandle The unique handle assigned to this handler by SmiHandlerRegister().
@param[in] Context Points to an optional handler context which was specified when the
handler was registered.
@param[in, out] CommBuffer A pointer to a collection of data in memory that will
be conveyed from a non-SMM environment into an SMM environment.
@param[in, out] CommBufferSize The size of the CommBuffer.
@retval EFI_SUCCESS The interrupt was handled and quiesced. No other handlers
should still be called.
@retval EFI_WARN_INTERRUPT_SOURCE_QUIESCED The interrupt has been quiesced but other handlers should
still be called.
@retval EFI_WARN_INTERRUPT_SOURCE_PENDING The interrupt is still pending and other handlers should still
be called.
@retval EFI_INTERRUPT_PENDING The interrupt could not be quiesced.
**/
EFI_STATUS
EFIAPI
CallbackThunk (
IN EFI_HANDLE DispatchHandle,
IN CONST VOID *Context OPTIONAL,
IN OUT VOID *CommBuffer OPTIONAL,
IN OUT UINTN *CommBufferSize OPTIONAL
)
{
EFI_STATUS Status;
CALLBACK_INFO *CallbackInfo;
UINTN Index;
UINTN CpuIndex;
EFI_SMM_CPU_STATE *State;
EFI_SMI_CPU_SAVE_STATE *SaveState;
///
/// Before transferring the control into the Framework SMI handler, update CPU Save States
/// and MP states in the Framework SMST.
///
for (CpuIndex = 0; CpuIndex < mNumberOfProcessors; CpuIndex++) {
State = (EFI_SMM_CPU_STATE *)gSmst->CpuSaveState[CpuIndex];
SaveState = &mFrameworkSmst->CpuSaveState[CpuIndex].Ia32SaveState;
if (State->x86.SMMRevId < EFI_SMM_MIN_REV_ID_x64) {
SaveState->SMBASE = State->x86.SMBASE;
SaveState->SMMRevId = State->x86.SMMRevId;
SaveState->IORestart = State->x86.IORestart;
SaveState->AutoHALTRestart = State->x86.AutoHALTRestart;
} else {
SaveState->SMBASE = State->x64.SMBASE;
SaveState->SMMRevId = State->x64.SMMRevId;
SaveState->IORestart = State->x64.IORestart;
SaveState->AutoHALTRestart = State->x64.AutoHALTRestart;
}
for (Index = 0; Index < sizeof (mCpuSaveStateConvTable) / sizeof (CPU_SAVE_STATE_CONVERSION); Index++) {
///
/// Try to use SMM CPU Protocol to access CPU save states if possible
///
Status = mSmmCpu->ReadSaveState (
mSmmCpu,
(UINTN)sizeof (UINT32),
mCpuSaveStateConvTable[Index].Register,
CpuIndex,
((UINT8 *)SaveState) + mCpuSaveStateConvTable[Index].Offset
);
ASSERT_EFI_ERROR (Status);
}
}
mFrameworkSmst->CurrentlyExecutingCpu = gSmst->CurrentlyExecutingCpu;
///
/// Search for Framework SMI handler information
///
CallbackInfo = GetCallbackInfo (DispatchHandle);
ASSERT (CallbackInfo != NULL);
///
/// Thunk into original Framwork SMI handler
///
Status = (CallbackInfo->CallbackAddress) (
CallbackInfo->SmmImageHandle,
CommBuffer,
CommBufferSize
);
///
/// Save CPU Save States in case any of them was modified
///
for (CpuIndex = 0; CpuIndex < mNumberOfProcessors; CpuIndex++) {
for (Index = 0; Index < sizeof (mCpuSaveStateConvTable) / sizeof (CPU_SAVE_STATE_CONVERSION); Index++) {
Status = mSmmCpu->WriteSaveState (
mSmmCpu,
(UINTN)sizeof (UINT32),
mCpuSaveStateConvTable[Index].Register,
CpuIndex,
((UINT8 *)&mFrameworkSmst->CpuSaveState[CpuIndex].Ia32SaveState) +
mCpuSaveStateConvTable[Index].Offset
);
}
}
///
/// Conversion of returned status code
///
switch (Status) {
case EFI_HANDLER_SUCCESS:
Status = EFI_WARN_INTERRUPT_SOURCE_QUIESCED;
break;
case EFI_HANDLER_CRITICAL_EXIT:
case EFI_HANDLER_SOURCE_QUIESCED:
Status = EFI_SUCCESS;
break;
case EFI_HANDLER_SOURCE_PENDING:
Status = EFI_WARN_INTERRUPT_SOURCE_PENDING;
break;
}
return Status;
}
/**
Thunk service of EFI_SMM_BASE_PROTOCOL.RegisterCallback().
@param[in, out] FunctionData Pointer to SMMBASE_FUNCTION_DATA.
**/
VOID
RegisterCallback (
IN OUT SMMBASE_FUNCTION_DATA *FunctionData
)
{
CALLBACK_INFO *Buffer;
///
/// Note that MakeLast and FloatingPointSave options are not supported in PI SMM
///
///
/// Allocate buffer for callback thunk information
///
Buffer = (CALLBACK_INFO *)AllocatePool (sizeof (CALLBACK_INFO));
if (Buffer == NULL) {
FunctionData->Status = EFI_OUT_OF_RESOURCES;
return;
}
///
/// Fill SmmImageHandle and CallbackAddress into the thunk
///
Buffer->SmmImageHandle = FunctionData->Args.RegisterCallback.SmmImageHandle;
Buffer->CallbackAddress = FunctionData->Args.RegisterCallback.CallbackAddress;
///
/// Register the thunk code as a root SMI handler
///
FunctionData->Status = gSmst->SmiHandlerRegister (
CallbackThunk,
NULL,
&Buffer->DispatchHandle
);
if (EFI_ERROR (FunctionData->Status)) {
FreePool (Buffer);
return;
}
///
/// Save this callback info
///
InsertTailList (&mCallbackInfoListHead, &Buffer->Link);
}
/**
Thunk service of EFI_SMM_BASE_PROTOCOL.SmmAllocatePool().
@param[in, out] FunctionData Pointer to SMMBASE_FUNCTION_DATA.
**/
VOID
HelperAllocatePool (
IN OUT SMMBASE_FUNCTION_DATA *FunctionData
)
{
FunctionData->Status = gSmst->SmmAllocatePool (
FunctionData->Args.AllocatePool.PoolType,
FunctionData->Args.AllocatePool.Size,
FunctionData->Args.AllocatePool.Buffer
);
}
/**
Thunk service of EFI_SMM_BASE_PROTOCOL.SmmFreePool().
@param[in, out] FunctionData Pointer to SMMBASE_FUNCTION_DATA.
**/
VOID
HelperFreePool (
IN OUT SMMBASE_FUNCTION_DATA *FunctionData
)
{
FreePool (FunctionData->Args.FreePool.Buffer);
FunctionData->Status = EFI_SUCCESS;
}
/**
Thunk service of EFI_SMM_BASE_PROTOCOL.Communicate().
@param[in, out] FunctionData Pointer to SMMBASE_FUNCTION_DATA.
**/
VOID
HelperCommunicate (
IN OUT SMMBASE_FUNCTION_DATA *FunctionData
)
{
LIST_ENTRY *Node;
CALLBACK_INFO *CallbackInfo;
if (FunctionData->Args.Communicate.CommunicationBuffer == NULL) {
FunctionData->Status = EFI_INVALID_PARAMETER;
return;
}
Node = GetFirstNode (&mCallbackInfoListHead);
while (!IsNull (&mCallbackInfoListHead, Node)) {
CallbackInfo = (CALLBACK_INFO *)Node;
if (FunctionData->Args.Communicate.ImageHandle == CallbackInfo->SmmImageHandle) {
///
/// Thunk into original Framwork SMI handler
///
(CallbackInfo->CallbackAddress) (
CallbackInfo->SmmImageHandle,
FunctionData->Args.Communicate.CommunicationBuffer,
FunctionData->Args.Communicate.SourceSize
);
///
/// The message was successfully posted.
///
FunctionData->Status = EFI_SUCCESS;
return;
}
Node = GetNextNode (&mCallbackInfoListHead, Node);
}
FunctionData->Status = EFI_INVALID_PARAMETER;
}
/**
Communication service SMI Handler entry.
This SMI handler provides services for the SMM Base Thunk driver.
@param[in] DispatchHandle The unique handle assigned to this handler by SmiHandlerRegister().
@param[in] RegisterContext Points to an optional handler context which was specified when the
handler was registered.
@param[in, out] CommBuffer A pointer to a collection of data in memory that will
be conveyed from a non-SMM environment into an SMM environment.
@param[in, out] CommBufferSize The size of the CommBuffer.
@retval EFI_SUCCESS The interrupt was handled and quiesced. No other handlers
should still be called.
@retval EFI_WARN_INTERRUPT_SOURCE_QUIESCED The interrupt has been quiesced but other handlers should
still be called.
@retval EFI_WARN_INTERRUPT_SOURCE_PENDING The interrupt is still pending and other handlers should still
be called.
@retval EFI_INTERRUPT_PENDING The interrupt could not be quiesced.
**/
EFI_STATUS
EFIAPI
SmmHandlerEntry (
IN EFI_HANDLE DispatchHandle,
IN CONST VOID *RegisterContext,
IN OUT VOID *CommBuffer,
IN OUT UINTN *CommBufferSize
)
{
SMMBASE_FUNCTION_DATA *FunctionData;
ASSERT (CommBuffer != NULL);
ASSERT (*CommBufferSize == sizeof (SMMBASE_FUNCTION_DATA));
FunctionData = (SMMBASE_FUNCTION_DATA *)CommBuffer;
switch (FunctionData->Function) {
case SmmBaseFunctionRegister:
Register (FunctionData);
break;
case SmmBaseFunctionUnregister:
UnRegister (FunctionData);
break;
case SmmBaseFunctionRegisterCallback:
RegisterCallback (FunctionData);
break;
case SmmBaseFunctionAllocatePool:
HelperAllocatePool (FunctionData);
break;
case SmmBaseFunctionFreePool:
HelperFreePool (FunctionData);
break;
case SmmBaseFunctionCommunicate:
HelperCommunicate (FunctionData);
break;
default:
ASSERT (FALSE);
FunctionData->Status = EFI_UNSUPPORTED;
}
return EFI_SUCCESS;
}
/**
Entry point function of the SMM Base Helper SMM 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
SmmBaseHelperMain (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
EFI_MP_SERVICES_PROTOCOL *MpServices;
EFI_HANDLE Handle;
UINTN NumberOfEnabledProcessors;
Handle = NULL;
///
/// Locate SMM CPU Protocol which is used later to retrieve/update CPU Save States
///
Status = gSmst->SmmLocateProtocol (&gEfiSmmCpuProtocolGuid, NULL, (VOID **) &mSmmCpu);
ASSERT_EFI_ERROR (Status);
///
/// Locate PE32 Image Protocol which is used later to load Framework SMM driver
///
Status = SystemTable->BootServices->LocateProtocol (&gEfiLoadPeImageProtocolGuid, NULL, (VOID **) &mLoadPe32Image);
ASSERT_EFI_ERROR (Status);
//
// Get MP Services Protocol
//
Status = SystemTable->BootServices->LocateProtocol (&gEfiMpServiceProtocolGuid, NULL, (VOID **)&MpServices);
ASSERT_EFI_ERROR (Status);
//
// Use MP Services Protocol to retrieve the number of processors and number of enabled processors
//
Status = MpServices->GetNumberOfProcessors (MpServices, &mNumberOfProcessors, &NumberOfEnabledProcessors);
ASSERT_EFI_ERROR (Status);
///
/// Interface structure of SMM BASE Helper Ready Protocol is allocated from UEFI pool
/// instead of SMM pool so that SMM Base Thunk driver can access it in Non-SMM mode.
///
Status = gBS->AllocatePool (
EfiBootServicesData,
sizeof (EFI_SMM_BASE_HELPER_READY_PROTOCOL),
(VOID **)&mSmmBaseHelperReady
);
ASSERT_EFI_ERROR (Status);
///
/// Construct Framework SMST from PI SMST
///
mFrameworkSmst = ConstructFrameworkSmst ();
mSmmBaseHelperReady->FrameworkSmst = mFrameworkSmst;
mSmmBaseHelperReady->ServiceEntry = SmmHandlerEntry;
///
/// Register SMM Base Helper services for SMM Base Thunk driver
///
Status = gSmst->SmiHandlerRegister (SmmHandlerEntry, &gEfiSmmBaseThunkCommunicationGuid, &mDispatchHandle);
ASSERT_EFI_ERROR (Status);
///
/// Install EFI SMM Base Helper Protocol in the UEFI handle database
///
Status = gBS->InstallProtocolInterface (
&Handle,
&gEfiSmmBaseHelperReadyProtocolGuid,
EFI_NATIVE_INTERFACE,
mSmmBaseHelperReady
);
ASSERT_EFI_ERROR (Status);
return Status;
}
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