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|
/** @file
SMM Base Protocol on SMM Base2 Protocol Thunk driver.
This driver co-operates with SMM Base Helper SMM driver to provide SMM Base Protocol
based on SMM Base2 Protocol.
This thunk driver is expected to be loaded before PI SMM IPL driver so that
SMM BASE Protocol can be published immediately after SMM Base2 Protocol is installed to
make SMM Base Protocol.InSmm() as early as possible.
Copyright (c) 2009 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 "SmmBaseOnSmmBase2Thunk.h"
EFI_SMM_BASE_PROTOCOL gSmmBase = {
SmmBaseRegister,
SmmBaseUnregister,
SmmBaseCommunicate,
SmmBaseRegisterCallback,
SmmBaseInSmm,
SmmBaseSmmAllocatePool,
SmmBaseSmmFreePool,
SmmBaseGetSmstLocation
};
SMMBASETHUNK_COMMUNICATION_DATA gCommunicationData = {
EFI_SMM_BASE_THUNK_COMMUNICATION_GUID,
sizeof (SMMBASE_FUNCTION_DATA)
};
EFI_HANDLE mImageHandle;
EFI_SMM_BASE2_PROTOCOL *mSmmBase2 = NULL;
EFI_SMM_COMMUNICATION_PROTOCOL *mSmmCommunication = NULL;
EFI_SMM_BASE_HELPER_READY_PROTOCOL *mSmmBaseHelperReady = NULL;
/**
Determine if in SMM mode.
@retval TRUE In SMM mode.
@retval FALSE Not in SMM mode.
**/
BOOLEAN
IsInSmm (
VOID
)
{
EFI_STATUS Status;
BOOLEAN InSmm;
Status = mSmmBase2->InSmm (mSmmBase2, &InSmm);
ASSERT_EFI_ERROR (Status);
return InSmm;
}
/**
Invoke services provided by SMM Base Helper SMM driver.
**/
VOID
SmmBaseHelperService (
VOID
)
{
UINTN DataSize;
gCommunicationData.FunctionData.Status = EFI_UNSUPPORTED;
if (IsInSmm()) {
///
/// If in SMM mode, directly call services in SMM Base Helper.
///
if (mSmmBaseHelperReady == NULL) {
ASSERT (FALSE);
return;
}
DataSize = (UINTN)(sizeof (SMMBASE_FUNCTION_DATA));
mSmmBaseHelperReady->ServiceEntry (
NULL,
NULL,
&gCommunicationData.FunctionData,
&DataSize
);
} else {
///
/// If in non-SMM mode, call services in SMM Base Helper via SMM Communication Protocol.
///
if (mSmmCommunication == NULL) {
ASSERT (FALSE);
return;
}
DataSize = (UINTN)(sizeof (gCommunicationData));
mSmmCommunication->Communicate (
mSmmCommunication,
&gCommunicationData,
&DataSize
);
}
}
/**
Register a given driver into SMRAM. This is the equivalent of performing
the LoadImage/StartImage into System Management Mode.
@param[in] This Protocol instance pointer.
@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.
@param[in] LegacyIA32Binary An optional parameter specifying that the associated
file is a real-mode IA-32 binary.
@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 This platform does not support 16-bit handlers.
@retval EFI_UNSUPPORTED Platform is in runtime.
@retval EFI_INVALID_PARAMETER The handlers was not the correct image type
**/
EFI_STATUS
EFIAPI
SmmBaseRegister (
IN EFI_SMM_BASE_PROTOCOL *This,
IN EFI_DEVICE_PATH_PROTOCOL *FilePath,
IN VOID *SourceBuffer,
IN UINTN SourceSize,
OUT EFI_HANDLE *ImageHandle,
IN BOOLEAN LegacyIA32Binary
)
{
if (LegacyIA32Binary) {
return EFI_UNSUPPORTED;
}
gCommunicationData.FunctionData.Function = SMMBASE_REGISTER;
gCommunicationData.FunctionData.Args.Register.FilePath = FilePath;
gCommunicationData.FunctionData.Args.Register.SourceBuffer = SourceBuffer;
gCommunicationData.FunctionData.Args.Register.SourceSize = SourceSize;
gCommunicationData.FunctionData.Args.Register.ImageHandle = ImageHandle;
gCommunicationData.FunctionData.Args.Register.LegacyIA32Binary = LegacyIA32Binary;
SmmBaseHelperService ();
return gCommunicationData.FunctionData.Status;
}
/**
Removes a handler from execution within SMRAM. This is the equivalent of performing
the UnloadImage in System Management Mode.
@param[in] This Protocol instance pointer.
@param[in] ImageHandle The handler to be removed.
@retval EFI_SUCCESS The operation was successful
@retval EFI_INVALID_PARAMETER The handler did not exist
@retval EFI_UNSUPPORTED Platform is in runtime.
**/
EFI_STATUS
EFIAPI
SmmBaseUnregister (
IN EFI_SMM_BASE_PROTOCOL *This,
IN EFI_HANDLE ImageHandle
)
{
gCommunicationData.FunctionData.Function = SMMBASE_UNREGISTER;
gCommunicationData.FunctionData.Args.UnRegister.ImageHandle = ImageHandle;
SmmBaseHelperService ();
return gCommunicationData.FunctionData.Status;
}
/**
The SMM Inter-module Communicate Service Communicate() function
provides a service to send/receive messages from a registered
EFI service. The BASE protocol driver is responsible for doing
any of the copies such that the data lives in boot-service-accessible RAM.
@param[in] This Protocol instance pointer.
@param[in] ImageHandle The handle of the registered driver.
@param[in,out] CommunicationBuffer Pointer to the buffer to convey into SMRAM.
@param[in,out] BufferSize The size of the data buffer being passed in.
On exit, the size of data being returned.
Zero if the handler does not wish to reply with any data.
@retval EFI_SUCCESS The message was successfully posted
@retval EFI_INVALID_PARAMETER The buffer was NULL
**/
EFI_STATUS
EFIAPI
SmmBaseCommunicate (
IN EFI_SMM_BASE_PROTOCOL *This,
IN EFI_HANDLE ImageHandle,
IN OUT VOID *CommunicationBuffer,
IN OUT UINTN *BufferSize
)
{
if (mSmmCommunication == NULL) {
ASSERT (FALSE);
return EFI_UNSUPPORTED;
}
return mSmmCommunication->Communicate (
mSmmCommunication,
CommunicationBuffer,
BufferSize
);
}
/**
Register a callback to execute within SMM.
This allows receipt of messages created with EFI_SMM_BASE_PROTOCOL.Communicate().
@param[in] This Protocol instance pointer.
@param[in] SmmImageHandle Handle of the callback service.
@param[in] CallbackAddress Address of the callback service.
@param[in] MakeLast If present, will stipulate that the handler is posted to
be executed last in the dispatch table.
@param[in] FloatingPointSave An optional parameter that informs the
EFI_SMM_ACCESS_PROTOCOL Driver core if it needs to save
the floating point register state. If any handler
require this, the state will be saved for all handlers.
@retval EFI_SUCCESS The operation was successful
@retval EFI_OUT_OF_RESOURCES Not enough space in the dispatch queue
@retval EFI_UNSUPPORTED Platform is in runtime.
@retval EFI_UNSUPPORTED The caller is not in SMM.
**/
EFI_STATUS
EFIAPI
SmmBaseRegisterCallback (
IN EFI_SMM_BASE_PROTOCOL *This,
IN EFI_HANDLE SmmImageHandle,
IN EFI_SMM_CALLBACK_ENTRY_POINT CallbackAddress,
IN BOOLEAN MakeLast,
IN BOOLEAN FloatingPointSave
)
{
if (!IsInSmm()) {
return EFI_UNSUPPORTED;
}
gCommunicationData.FunctionData.Function = SMMBASE_REGISTER_CALLBACK;
gCommunicationData.FunctionData.Args.RegisterCallback.SmmImageHandle = SmmImageHandle;
gCommunicationData.FunctionData.Args.RegisterCallback.CallbackAddress = CallbackAddress;
gCommunicationData.FunctionData.Args.RegisterCallback.MakeLast = MakeLast;
gCommunicationData.FunctionData.Args.RegisterCallback.FloatingPointSave = FloatingPointSave;
SmmBaseHelperService();
return gCommunicationData.FunctionData.Status;
}
/**
This routine tells caller if execution context is SMM or not.
@param[in] This Protocol instance pointer.
@param[out] InSmm Whether the caller is inside SMM for IA-32
or servicing a PMI for the Itanium processor
family.
@retval EFI_SUCCESS The operation was successful
@retval EFI_INVALID_PARAMETER InSmm was NULL.
**/
EFI_STATUS
EFIAPI
SmmBaseInSmm (
IN EFI_SMM_BASE_PROTOCOL *This,
OUT BOOLEAN *InSmm
)
{
return mSmmBase2->InSmm (mSmmBase2, InSmm);
}
/**
The SmmAllocatePool() function allocates a memory region of Size bytes from memory of
type PoolType and returns the address of the allocated memory in the location referenced
by Buffer. This function allocates pages from EFI SMRAM Memory as needed to grow the
requested pool type. All allocations are eight-byte aligned.
@param[in] This Protocol instance pointer.
@param[in] PoolType The type of pool to allocate.
The only supported type is EfiRuntimeServicesData;
the interface will internally map this runtime request to
SMRAM for IA-32 and leave as this type for the Itanium
processor family. Other types can be ignored.
@param[in] Size The number of bytes to allocate from the pool.
@param[out] Buffer A pointer to a pointer to the allocated buffer if the call
succeeds; undefined otherwise.
@retval EFI_SUCCESS The requested number of bytes was allocated.
@retval EFI_OUT_OF_RESOURCES The pool requested could not be allocated.
@retval EFI_UNSUPPORTED Platform is in runtime.
**/
EFI_STATUS
EFIAPI
SmmBaseSmmAllocatePool (
IN EFI_SMM_BASE_PROTOCOL *This,
IN EFI_MEMORY_TYPE PoolType,
IN UINTN Size,
OUT VOID **Buffer
)
{
gCommunicationData.FunctionData.Function = SMMBASE_ALLOCATE_POOL;
gCommunicationData.FunctionData.Args.AllocatePool.PoolType = PoolType;
gCommunicationData.FunctionData.Args.AllocatePool.Size = Size;
gCommunicationData.FunctionData.Args.AllocatePool.Buffer = Buffer;
SmmBaseHelperService ();
return gCommunicationData.FunctionData.Status;
}
/**
The SmmFreePool() function returns the memory specified by Buffer to the system.
On return, the memory's type is EFI SMRAM Memory. The Buffer that is freed must
have been allocated by SmmAllocatePool().
@param[in] This Protocol instance pointer.
@param[in] Buffer Pointer to the buffer allocation.
@retval EFI_SUCCESS The memory was returned to the system.
@retval EFI_INVALID_PARAMETER Buffer was invalid.
@retval EFI_UNSUPPORTED Platform is in runtime.
**/
EFI_STATUS
EFIAPI
SmmBaseSmmFreePool (
IN EFI_SMM_BASE_PROTOCOL *This,
IN VOID *Buffer
)
{
gCommunicationData.FunctionData.Function = SMMBASE_FREE_POOL;
gCommunicationData.FunctionData.Args.FreePool.Buffer = Buffer;
SmmBaseHelperService ();
return gCommunicationData.FunctionData.Status;
}
/**
The GetSmstLocation() function returns the location of the System Management
Service Table. The use of the API is such that a driver can discover the
location of the SMST in its entry point and then cache it in some driver
global variable so that the SMST can be invoked in subsequent callbacks.
@param[in] This Protocol instance pointer.
@param[in] Smst Pointer to the SMST.
@retval EFI_SUCCESS The operation was successful
@retval EFI_INVALID_PARAMETER Smst was invalid.
@retval EFI_UNSUPPORTED Not in SMM.
**/
EFI_STATUS
EFIAPI
SmmBaseGetSmstLocation (
IN EFI_SMM_BASE_PROTOCOL *This,
OUT EFI_SMM_SYSTEM_TABLE **Smst
)
{
if (mSmmBaseHelperReady == NULL) {
ASSERT (FALSE);
return EFI_UNSUPPORTED;
}
if (!IsInSmm ()) {
return EFI_UNSUPPORTED;
}
if (Smst == NULL) {
return EFI_INVALID_PARAMETER;
}
*Smst = mSmmBaseHelperReady->FrameworkSmst;
return EFI_SUCCESS;
}
/**
SMM Base Protocol notification event handler.
@param[in] Event Event whose notification function is being invoked.
@param[in] Context Pointer to the notification function's context.
**/
VOID
EFIAPI
SmmBaseProtocolNotification (
IN EFI_EVENT Event,
IN VOID *Context
)
{
EFI_STATUS Status;
///
/// Assume only one instance of SMM Base2 Protocol in the system
/// Locate SMM Base2 Protocol
///
Status = gBS->LocateProtocol (&gEfiSmmBase2ProtocolGuid, NULL, (VOID **) &mSmmBase2);
if (!EFI_ERROR (Status)) {
///
/// Publish Framework SMM BASE Protocol immediately after SMM Base2 Protocol is installed to
/// make SMM Base Protocol.InSmm() available as early as possible.
///
Status = gBS->InstallProtocolInterface (
&mImageHandle,
&gEfiSmmBaseProtocolGuid,
EFI_NATIVE_INTERFACE,
&gSmmBase
);
ASSERT_EFI_ERROR (Status);
}
}
/**
SMM Communication Protocol notification event handler.
@param[in] Event Event whose notification function is being invoked.
@param[in] Context Pointer to the notification function's context.
**/
VOID
EFIAPI
SmmCommunicationProtocolNotification (
IN EFI_EVENT Event,
IN VOID *Context
)
{
///
/// Assume only one instance of SMM Communication Protocol in the system
/// Locate SMM Communication Protocol
///
gBS->LocateProtocol (&gEfiSmmCommunicationProtocolGuid, NULL, (VOID **) &mSmmCommunication);
}
/**
SMM Base Helper Ready Protocol notification event handler.
@param[in] Event Event whose notification function is being invoked.
@param[in] Context Pointer to the notification function's context.
**/
VOID
EFIAPI
SmmBaseHelperReadyProtocolNotification (
IN EFI_EVENT Event,
IN VOID *Context
)
{
///
/// Assume only one instance of SMM Base Helper Ready Protocol in the system
/// Locate SMM Base Helper Ready Protocol
///
gBS->LocateProtocol (&gEfiSmmBaseHelperReadyProtocolGuid, NULL, (VOID **) &mSmmBaseHelperReady);
}
/**
Entry Point for SMM Base Protocol on SMM Base2 Protocol Thunk driver.
@param[in] ImageHandle Image handle of this driver.
@param[in] SystemTable A Pointer to the EFI System Table.
@retval EFI_SUCCESS The entry point is executed successfully.
**/
EFI_STATUS
EFIAPI
SmmBaseThunkMain (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
VOID *Registration;
mImageHandle = ImageHandle;
///
/// Install notifications for required protocols
///
/// Note we use protocol notifications here so as that this thunk driver can be
/// loaded before PI SMM IPL driver. Framework SMM BASE Protocol will be published
/// immediately after SMM Base2 Protocol is installed to make SMM Base Protocol.InSmm()
/// available as early as possible because some Framework code's behavior depends on
/// correct detection of SMM mode via SMM Base Protocol.InSmm().
///
/// Also SMM Base Helper driver is expected to be dispatched
/// in the earliest round of SMM driver dispatch just after SMM IPL driver loads SMM Foundation.
/// So the full functionality of SMM Base Protocol is ready immediately after SMM IPL driver is
/// loaded. Since that point Framework SMM driver can be succesufully supported.
///
EfiCreateProtocolNotifyEvent (
&gEfiSmmBase2ProtocolGuid,
TPL_CALLBACK,
SmmBaseProtocolNotification,
NULL,
&Registration
);
EfiCreateProtocolNotifyEvent (
&gEfiSmmCommunicationProtocolGuid,
TPL_CALLBACK,
SmmCommunicationProtocolNotification,
NULL,
&Registration
);
EfiCreateProtocolNotifyEvent (
&gEfiSmmBaseHelperReadyProtocolGuid,
TPL_CALLBACK,
SmmBaseHelperReadyProtocolNotification,
NULL,
&Registration
);
return EFI_SUCCESS;
}
|