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audk/MdeModulePkg/Core/PiSmmCore/PiSmmIpl.c

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/** @file
SMM IPL that produces SMM related runtime protocols and load the SMM Core into SMRAM
Copyright (c) 2009 - 2010, Intel Corporation. All rights reserved.<BR>
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 <PiDxe.h>
#include <Protocol/SmmBase2.h>
#include <Protocol/SmmCommunication.h>
#include <Protocol/SmmAccess2.h>
#include <Protocol/SmmConfiguration.h>
#include <Protocol/SmmControl2.h>
#include <Protocol/DxeSmmReadyToLock.h>
#include <Protocol/FirmwareVolume2.h>
#include <Guid/EventGroup.h>
#include <Guid/EventLegacyBios.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/PeCoffLib.h>
#include <Library/CacheMaintenanceLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/DebugLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/DxeServicesTableLib.h>
#include <Library/UefiLib.h>
#include <Library/UefiRuntimeLib.h>
#include "PiSmmCorePrivateData.h"
//
// Function prototypes from produced protocols
//
/**
Indicate whether the driver is currently executing in the SMM Initialization phase.
@param This The EFI_SMM_BASE2_PROTOCOL instance.
@param InSmram Pointer to a Boolean which, on return, indicates that the driver is currently executing
inside of SMRAM (TRUE) or outside of SMRAM (FALSE).
@retval EFI_INVALID_PARAMETER InSmram was NULL.
@retval EFI_SUCCESS The call returned successfully.
**/
EFI_STATUS
EFIAPI
SmmBase2InSmram (
IN CONST EFI_SMM_BASE2_PROTOCOL *This,
OUT BOOLEAN *InSmram
);
/**
Retrieves the location of the System Management System Table (SMST).
@param This The EFI_SMM_BASE2_PROTOCOL instance.
@param Smst On return, points to a pointer to the System Management Service Table (SMST).
@retval EFI_INVALID_PARAMETER Smst or This was invalid.
@retval EFI_SUCCESS The memory was returned to the system.
@retval EFI_UNSUPPORTED Not in SMM.
**/
EFI_STATUS
EFIAPI
SmmBase2GetSmstLocation (
IN CONST EFI_SMM_BASE2_PROTOCOL *This,
OUT EFI_SMM_SYSTEM_TABLE2 **Smst
);
/**
Communicates with a registered handler.
This function provides a service to send and receive messages from a registered
UEFI service. This function is part of the SMM Communication Protocol that may
be called in physical mode prior to SetVirtualAddressMap() and in virtual mode
after SetVirtualAddressMap().
@param[in] This The EFI_SMM_COMMUNICATION_PROTOCOL instance.
@param[in out] CommBuffer A pointer to the buffer to convey into SMRAM.
@param[in out] CommSize 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 CommBuffer was NULL.
**/
EFI_STATUS
EFIAPI
SmmCommunicationCommunicate (
IN CONST EFI_SMM_COMMUNICATION_PROTOCOL *This,
IN OUT VOID *CommBuffer,
IN OUT UINTN *CommSize
);
/**
Event notification that is fired every time a gEfiSmmConfigurationProtocol installs.
@param Event The Event that is being processed, not used.
@param Context Event Context, not used.
**/
VOID
EFIAPI
SmmIplSmmConfigurationEventNotify (
IN EFI_EVENT Event,
IN VOID *Context
);
/**
Event notification that is fired every time a DxeSmmReadyToLock protocol is added
or if gEfiEventReadyToBootGuid is signalled.
@param Event The Event that is being processed, not used.
@param Context Event Context, not used.
**/
VOID
EFIAPI
SmmIplReadyToLockEventNotify (
IN EFI_EVENT Event,
IN VOID *Context
);
/**
Event notification that is fired when DxeDispatch Event Group is signaled.
@param Event The Event that is being processed, not used.
@param Context Event Context, not used.
**/
VOID
EFIAPI
SmmIplGuidedEventNotify (
IN EFI_EVENT Event,
IN VOID *Context
);
/**
Notification function of EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE.
This is a notification function registered on EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event.
It convers pointer to new virtual address.
@param Event Event whose notification function is being invoked.
@param Context Pointer to the notification function's context.
**/
VOID
EFIAPI
SmmIplSetVirtualAddressNotify (
IN EFI_EVENT Event,
IN VOID *Context
);
//
// Data structure used to declare a table of protocol notifications and event
// notifications required by the SMM IPL
//
typedef struct {
BOOLEAN Protocol;
BOOLEAN CloseOnLock;
EFI_GUID *Guid;
EFI_EVENT_NOTIFY NotifyFunction;
VOID *NotifyContext;
EFI_EVENT Event;
} SMM_IPL_EVENT_NOTIFICATION;
//
// Handle to install the SMM Base2 Protocol and the SMM Communication Protocol
//
EFI_HANDLE mSmmIplHandle = NULL;
//
// SMM Base 2 Protocol instance
//
EFI_SMM_BASE2_PROTOCOL mSmmBase2 = {
SmmBase2InSmram,
SmmBase2GetSmstLocation
};
//
// SMM Communication Protocol instance
//
EFI_SMM_COMMUNICATION_PROTOCOL mSmmCommunication = {
SmmCommunicationCommunicate
};
//
// SMM Core Private Data structure that contains the data shared between
// the SMM IPL and the SMM Core.
//
SMM_CORE_PRIVATE_DATA mSmmCorePrivateData = {
SMM_CORE_PRIVATE_DATA_SIGNATURE, // Signature
NULL, // SmmIplImageHandle
0, // SmramRangeCount
NULL, // SmramRanges
NULL, // SmmEntryPoint
FALSE, // SmmEntryPointRegistered
FALSE, // InSmm
NULL, // Smst
0, // BufferSize
NULL, // CommunicationBuffer
EFI_SUCCESS // ReturnStatus
};
//
// Global pointer used to access mSmmCorePrivateData from outside and inside SMM
//
SMM_CORE_PRIVATE_DATA *gSmmCorePrivate = &mSmmCorePrivateData;
//
// SMM IPL global variables
//
EFI_SMM_CONTROL2_PROTOCOL *mSmmControl2;
EFI_SMM_ACCESS2_PROTOCOL *mSmmAccess;
EFI_SMRAM_DESCRIPTOR *mCurrentSmramRange;
BOOLEAN mSmmLocked = FALSE;
//
// Table of Protocol notification and GUIDed Event notifications that the SMM IPL requires
//
SMM_IPL_EVENT_NOTIFICATION mSmmIplEvents[] = {
//
// Declare protocol notification on the SMM Configuration protocol. When this notification is etablished,
// the associated event is immediately signalled, so the notification function will be executed and the
// SMM Configuration Protocol will be found if it is already in the handle database.
//
{ TRUE, FALSE, &gEfiSmmConfigurationProtocolGuid, SmmIplSmmConfigurationEventNotify, &gEfiSmmConfigurationProtocolGuid, NULL },
//
// Declare protocl notification on DxeSmmReadyToLock protocols. When this notification is etablished,
// the associated event is immediately signalled, so the notification function will be executed and the
// DXE SMM Ready To Lock Protocol will be found if it is already in the handle database.
//
{ TRUE, TRUE, &gEfiDxeSmmReadyToLockProtocolGuid, SmmIplReadyToLockEventNotify, &gEfiDxeSmmReadyToLockProtocolGuid, NULL },
//
// Declare event notification on the DXE Dispatch Event Group. This event is signaled by the DXE Core
// each time the DXE Core dispatcher has completed its work. When this event is signalled, the SMM Core
// if notified, so the SMM Core can dispatch SMM drivers.
//
{ FALSE, TRUE, &gEfiEventDxeDispatchGuid, SmmIplGuidedEventNotify, &gEfiEventDxeDispatchGuid, NULL },
//
// Declare event notification on Ready To Boot Event Group. This is an extra event notification that is
// used to make sure SMRAM is locked before any boot options are processed.
//
{ FALSE, TRUE, &gEfiEventReadyToBootGuid, SmmIplReadyToLockEventNotify, &gEfiEventReadyToBootGuid, NULL },
//
// Declare event notification on Legacy Boot Event Group. This is used to inform the SMM Core that the platform
// is performing a legacy boot operation, and that the UEFI environment is no longer available and the SMM Core
// must guarantee that it does not access any UEFI related structures outside of SMRAM.
//
{ FALSE, FALSE, &gEfiEventLegacyBootGuid, SmmIplGuidedEventNotify, &gEfiEventLegacyBootGuid, NULL },
//
// Declare event notification on SetVirtualAddressMap() Event Group. This is used to convert gSmmCorePrivate
// and mSmmControl2 from physical addresses to virtual addresses.
//
{ FALSE, FALSE, &gEfiEventVirtualAddressChangeGuid, SmmIplSetVirtualAddressNotify, NULL, NULL },
//
// Terminate the table of event notifications
//
{ FALSE, FALSE, NULL, NULL, NULL, NULL }
};
/**
Indicate whether the driver is currently executing in the SMM Initialization phase.
@param This The EFI_SMM_BASE2_PROTOCOL instance.
@param InSmram Pointer to a Boolean which, on return, indicates that the driver is currently executing
inside of SMRAM (TRUE) or outside of SMRAM (FALSE).
@retval EFI_INVALID_PARAMETER InSmram was NULL.
@retval EFI_SUCCESS The call returned successfully.
**/
EFI_STATUS
EFIAPI
SmmBase2InSmram (
IN CONST EFI_SMM_BASE2_PROTOCOL *This,
OUT BOOLEAN *InSmram
)
{
if (InSmram == NULL) {
return EFI_INVALID_PARAMETER;
}
*InSmram = gSmmCorePrivate->InSmm;
return EFI_SUCCESS;
}
/**
Retrieves the location of the System Management System Table (SMST).
@param This The EFI_SMM_BASE2_PROTOCOL instance.
@param Smst On return, points to a pointer to the System Management Service Table (SMST).
@retval EFI_INVALID_PARAMETER Smst or This was invalid.
@retval EFI_SUCCESS The memory was returned to the system.
@retval EFI_UNSUPPORTED Not in SMM.
**/
EFI_STATUS
EFIAPI
SmmBase2GetSmstLocation (
IN CONST EFI_SMM_BASE2_PROTOCOL *This,
OUT EFI_SMM_SYSTEM_TABLE2 **Smst
)
{
if ((This == NULL) ||(Smst == NULL)) {
return EFI_INVALID_PARAMETER;
}
if (!gSmmCorePrivate->InSmm) {
return EFI_UNSUPPORTED;
}
*Smst = gSmmCorePrivate->Smst;
return EFI_SUCCESS;
}
/**
Communicates with a registered handler.
This function provides a service to send and receive messages from a registered
UEFI service. This function is part of the SMM Communication Protocol that may
be called in physical mode prior to SetVirtualAddressMap() and in virtual mode
after SetVirtualAddressMap().
@param[in] This The EFI_SMM_COMMUNICATION_PROTOCOL instance.
@param[in out] CommBuffer A pointer to the buffer to convey into SMRAM.
@param[in out] CommSize 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 CommBuffer was NULL.
**/
EFI_STATUS
EFIAPI
SmmCommunicationCommunicate (
IN CONST EFI_SMM_COMMUNICATION_PROTOCOL *This,
IN OUT VOID *CommBuffer,
IN OUT UINTN *CommSize
)
{
EFI_STATUS Status;
EFI_SMM_COMMUNICATE_HEADER *CommunicateHeader;
BOOLEAN OldInSmm;
//
// Check parameters
//
if ((CommBuffer == NULL) || (CommSize == NULL)) {
return EFI_INVALID_PARAMETER;
}
//
// If not already in SMM, then generate a Software SMI
//
if (!gSmmCorePrivate->InSmm && gSmmCorePrivate->SmmEntryPointRegistered) {
//
// Put arguments for Software SMI in gSmmCorePrivate
//
gSmmCorePrivate->CommunicationBuffer = CommBuffer;
gSmmCorePrivate->BufferSize = CommSize;
//
// Generate Software SMI
//
Status = mSmmControl2->Trigger (mSmmControl2, NULL, NULL, FALSE, 0);
if (EFI_ERROR (Status)) {
return EFI_UNSUPPORTED;
}
//
// Return status from software SMI
//
return gSmmCorePrivate->ReturnStatus;
}
//
// If we are in SMM, then the execution mode must be physical, which means that
// OS established virtual addresses can not be used. If SetVirtualAddressMap()
// has been called, then a direct invocation of the Software SMI is not
// not allowed so return EFI_INVALID_PARAMETER.
//
if (EfiGoneVirtual()) {
return EFI_INVALID_PARAMETER;
}
//
// Don't allow call SmiManage() directly when SMRAM is closed or locked.
//
if (!mSmmAccess->OpenState || mSmmAccess->LockState) {
return EFI_INVALID_PARAMETER;
}
//
// Save current InSmm state and set InSmm state to TRUE
//
OldInSmm = gSmmCorePrivate->InSmm;
gSmmCorePrivate->InSmm = TRUE;
//
// Already in SMM and before SetVirtualAddressMap(), so call SmiManage() directly.
//
CommunicateHeader = (EFI_SMM_COMMUNICATE_HEADER *)CommBuffer;
*CommSize -= OFFSET_OF (EFI_SMM_COMMUNICATE_HEADER, Data);
Status = gSmmCorePrivate->Smst->SmiManage (
&CommunicateHeader->HeaderGuid,
NULL,
CommunicateHeader->Data,
CommSize
);
//
// Update CommunicationBuffer, BufferSize and ReturnStatus
// Communicate service finished, reset the pointer to CommBuffer to NULL
//
*CommSize += OFFSET_OF (EFI_SMM_COMMUNICATE_HEADER, Data);
//
// Restore original InSmm state
//
gSmmCorePrivate->InSmm = OldInSmm;
return (Status == EFI_WARN_INTERRUPT_SOURCE_QUIESCED) ? EFI_SUCCESS : EFI_NOT_FOUND;
}
/**
Event notification that is fired when DxeDispatch Event Group is signaled.
@param Event The Event that is being processed, not used.
@param Context Event Context, not used.
**/
VOID
EFIAPI
SmmIplGuidedEventNotify (
IN EFI_EVENT Event,
IN VOID *Context
)
{
EFI_SMM_COMMUNICATE_HEADER CommunicateHeader;
UINTN Size;
//
// Use Guid to initialize EFI_SMM_COMMUNICATE_HEADER structure
//
CopyGuid (&CommunicateHeader.HeaderGuid, (EFI_GUID *)Context);
CommunicateHeader.MessageLength = 1;
CommunicateHeader.Data[0] = 0;
//
// Generate the Software SMI and return the result
//
Size = sizeof (CommunicateHeader);
SmmCommunicationCommunicate (&mSmmCommunication, &CommunicateHeader, &Size);
}
/**
Event notification that is fired every time a gEfiSmmConfigurationProtocol installs.
@param Event The Event that is being processed, not used.
@param Context Event Context, not used.
**/
VOID
EFIAPI
SmmIplSmmConfigurationEventNotify (
IN EFI_EVENT Event,
IN VOID *Context
)
{
EFI_STATUS Status;
EFI_SMM_CONFIGURATION_PROTOCOL *SmmConfiguration;
//
// Make sure this notification is for this handler
//
Status = gBS->LocateProtocol (Context, NULL, (VOID **)&SmmConfiguration);
if (EFI_ERROR (Status)) {
return;
}
//
// Register the SMM Entry Point provided by the SMM Core with the SMM COnfiguration protocol
//
Status = SmmConfiguration->RegisterSmmEntry (SmmConfiguration, gSmmCorePrivate->SmmEntryPoint);
ASSERT_EFI_ERROR (Status);
//
// Set flag to indicate that the SM< Entry Point has been registered which
// means that SMIs are now fully operational.
//
gSmmCorePrivate->SmmEntryPointRegistered = TRUE;
//
// Print debug message showing SMM Core entry point address.
//
DEBUG ((DEBUG_INFO, "SMM IPL registered SMM Entry Point address %p\n", (VOID *)(UINTN)gSmmCorePrivate->SmmEntryPoint));
//
// Attempt to reset SMRAM cacheability to UC
//
Status = gDS->SetMemorySpaceAttributes(
mCurrentSmramRange->CpuStart,
mCurrentSmramRange->PhysicalSize,
EFI_MEMORY_UC
);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_WARN, "SMM IPL failed to reset SMRAM window to EFI_MEMORY_UC\n"));
}
//
// Close all SMRAM ranges to protect SMRAM
//
Status = mSmmAccess->Close (mSmmAccess);
ASSERT_EFI_ERROR (Status);
//
// Print debug message that the SMRAM window is now closed.
//
DEBUG ((DEBUG_INFO, "SMM IPL closed SMRAM window\n"));
}
/**
Event notification that is fired every time a DxeSmmReadyToLock protocol is added
or if gEfiEventReadyToBootGuid is signalled.
@param Event The Event that is being processed, not used.
@param Context Event Context, not used.
**/
VOID
EFIAPI
SmmIplReadyToLockEventNotify (
IN EFI_EVENT Event,
IN VOID *Context
)
{
EFI_STATUS Status;
VOID *Interface;
UINTN Index;
//
// See if we are already locked
//
if (mSmmLocked) {
return;
}
//
// Make sure this notification is for this handler
//
if (CompareGuid ((EFI_GUID *)Context, &gEfiDxeSmmReadyToLockProtocolGuid)) {
Status = gBS->LocateProtocol (&gEfiDxeSmmReadyToLockProtocolGuid, NULL, &Interface);
if (EFI_ERROR (Status)) {
return;
}
} else {
//
// If SMM is not locked yet and we got here from gEfiEventReadyToBootGuid being
// signalled, then gEfiDxeSmmReadyToLockProtocolGuid was not installed as expected.
// Print a warning on debug builds.
//
DEBUG ((DEBUG_WARN, "SMM IPL! DXE SMM Ready To Lock Protocol not installed before Ready To Boot signal\n"));
}
//
// Lock the SMRAM (Note: Locking SMRAM may not be supported on all platforms)
//
mSmmAccess->Lock (mSmmAccess);
//
// Close protocol and event notification events that do not apply after the
// DXE SMM Ready To Lock Protocol has been installed or the Ready To Boot
// event has been signalled.
//
for (Index = 0; mSmmIplEvents[Index].NotifyFunction != NULL; Index++) {
if (mSmmIplEvents[Index].CloseOnLock) {
gBS->CloseEvent (mSmmIplEvents[Index].Event);
}
}
//
// Inform SMM Core that the DxeSmmReadyToLock protocol was installed
//
SmmIplGuidedEventNotify (Event, (VOID *)&gEfiDxeSmmReadyToLockProtocolGuid);
//
// Print debug message that the SMRAM window is now locked.
//
DEBUG ((DEBUG_INFO, "SMM IPL locked SMRAM window\n"));
//
// Set flag so this operation will not be performed again
//
mSmmLocked = TRUE;
}
/**
Notification function of EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE.
This is a notification function registered on EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event.
It convers pointer to new virtual address.
@param Event Event whose notification function is being invoked.
@param Context Pointer to the notification function's context.
**/
VOID
EFIAPI
SmmIplSetVirtualAddressNotify (
IN EFI_EVENT Event,
IN VOID *Context
)
{
EfiConvertPointer (0x0, (VOID **)&mSmmControl2);
}
/**
Searches all Firmware Volumes for the first file matching FileType and SectionType and returns the section data.
@param FileType FileType to search for within any of the firmware volumes in the platform.
@param SectionType SectionType to search for within any of the matching FileTypes in the firmware volumes in the platform.
@param SourceSize Return the size of the returned section data..
@retval != NULL Pointer to the allocated buffer containing the section data.
@retval NULL Section data was not found.
**/
VOID *
GetSectionInAnyFv (
IN EFI_FV_FILETYPE FileType,
IN EFI_SECTION_TYPE SectionType,
OUT UINTN *SourceSize
)
{
EFI_STATUS Status;
UINTN HandleCount;
EFI_HANDLE *HandleBuffer;
UINTN Index;
EFI_FIRMWARE_VOLUME2_PROTOCOL *Fv;
UINTN Key;
EFI_GUID NameGuid;
EFI_FV_FILE_ATTRIBUTES Attributes;
VOID *SourceBuffer;
UINT32 AuthenticationStatus;
HandleBuffer = NULL;
Status = gBS->LocateHandleBuffer (
ByProtocol,
&gEfiFirmwareVolume2ProtocolGuid,
NULL,
&HandleCount,
&HandleBuffer
);
if (EFI_ERROR (Status)) {
return NULL;
}
for (Index = 0; Index < HandleCount; Index++) {
Status = gBS->HandleProtocol (
HandleBuffer[Index],
&gEfiFirmwareVolume2ProtocolGuid,
(VOID **)&Fv
);
if (EFI_ERROR (Status)) {
continue;
}
//
// Use Firmware Volume 2 Protocol to search for a file of type FileType
//
Key = 0;
Status = Fv->GetNextFile (Fv, &Key, &FileType, &NameGuid, &Attributes, SourceSize);
if (EFI_ERROR (Status)) {
continue;
}
//
// Use Firmware Volume 2 Protocol to read a section of type SectionType
//
SourceBuffer = NULL;
Status = Fv->ReadSection (Fv, &NameGuid, SectionType, 0, &SourceBuffer, SourceSize, &AuthenticationStatus);
if (!EFI_ERROR (Status)) {
FreePool (HandleBuffer);
return SourceBuffer;
}
}
FreePool(HandleBuffer);
return NULL;
}
/**
Load the SMM Core image into SMRAM and executes the SMM Core from SMRAM.
@param[in] SmramRange Descriptor for the range of SMRAM to reload the
currently executing image.
@param[in] Context Context to pass into SMM Core
@return EFI_STATUS
**/
EFI_STATUS
ExecuteSmmCoreFromSmram (
IN EFI_SMRAM_DESCRIPTOR *SmramRange,
IN VOID *Context
)
{
EFI_STATUS Status;
VOID *SourceBuffer;
UINTN SourceSize;
PE_COFF_LOADER_IMAGE_CONTEXT ImageContext;
UINTN PageCount;
EFI_PHYSICAL_ADDRESS DestinationBuffer;
EFI_IMAGE_ENTRY_POINT EntryPoint;
//
// Search all Firmware Volumes for a PE/COFF image in a file of type SMM_CORE
//
SourceBuffer = GetSectionInAnyFv (EFI_FV_FILETYPE_SMM_CORE, EFI_SECTION_PE32, &SourceSize);
if (SourceBuffer == NULL) {
return EFI_NOT_FOUND;
}
//
// Initilize ImageContext
//
ImageContext.Handle = SourceBuffer;
ImageContext.ImageRead = PeCoffLoaderImageReadFromMemory;
//
// Get information about the image being loaded
//
Status = PeCoffLoaderGetImageInfo (&ImageContext);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Allocate memory for the image being loaded from the EFI_SRAM_DESCRIPTOR
// specified by SmramRange
//
PageCount = (UINTN)EFI_SIZE_TO_PAGES(ImageContext.ImageSize + ImageContext.SectionAlignment);
ASSERT ((SmramRange->PhysicalSize & EFI_PAGE_MASK) == 0);
ASSERT (SmramRange->PhysicalSize > EFI_PAGES_TO_SIZE (PageCount));
SmramRange->PhysicalSize -= EFI_PAGES_TO_SIZE (PageCount);
DestinationBuffer = SmramRange->CpuStart + SmramRange->PhysicalSize;
//
// Align buffer on section boundry
//
ImageContext.ImageAddress = DestinationBuffer;
ImageContext.ImageAddress += ImageContext.SectionAlignment - 1;
ImageContext.ImageAddress &= ~(ImageContext.SectionAlignment - 1);
//
// Print debug message showing SMM Core load address.
//
DEBUG ((DEBUG_INFO, "SMM IPL loading SMM Core at SMRAM address %p\n", (VOID *)(UINTN)ImageContext.ImageAddress));
//
// Load the image to our new buffer
//
Status = PeCoffLoaderLoadImage (&ImageContext);
if (!EFI_ERROR (Status)) {
//
// Relocate the image in our new buffer
//
Status = PeCoffLoaderRelocateImage (&ImageContext);
if (!EFI_ERROR (Status)) {
//
// Flush the instruction cache so the image data are written before we execute it
//
InvalidateInstructionCacheRange ((VOID *)(UINTN)ImageContext.ImageAddress, (UINTN)ImageContext.ImageSize);
//
// Print debug message showing SMM Core entry point address.
//
DEBUG ((DEBUG_INFO, "SMM IPL calling SMM Core at SMRAM address %p\n", (VOID *)(UINTN)ImageContext.EntryPoint));
//
// Execute image
//
EntryPoint = (EFI_IMAGE_ENTRY_POINT)(UINTN)ImageContext.EntryPoint;
Status = EntryPoint ((EFI_HANDLE)Context, gST);
}
}
//
// If the load operation, relocate operation, or the image execution return an
// error, then free memory allocated from the EFI_SRAM_DESCRIPTOR specified by
// SmramRange
//
if (EFI_ERROR (Status)) {
SmramRange->PhysicalSize += EFI_PAGES_TO_SIZE (PageCount);
}
//
// Always free memory allocted by GetFileBufferByFilePath ()
//
FreePool (SourceBuffer);
return Status;
}
/**
The Entry Point for SMM IPL
Load SMM Core into SMRAM, register SMM Core entry point for SMIs, install
SMM Base 2 Protocol and SMM Communication Protocol, and register for the
critical events required to coordinate between DXE and SMM environments.
@param ImageHandle The firmware allocated handle for the EFI image.
@param SystemTable A pointer to the EFI System Table.
@retval EFI_SUCCESS The entry point is executed successfully.
@retval Other Some error occurred when executing this entry point.
**/
EFI_STATUS
EFIAPI
SmmIplEntry (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
EFI_SMM_CONFIGURATION_PROTOCOL *SmmConfiguration;
UINTN Size;
UINTN Index;
EFI_SMM_RESERVED_SMRAM_REGION *SmramResRegion;
UINT64 MaxSize;
VOID *Registration;
//
// Fill in the image handle of the SMM IPL so the SMM Core can use this as the
// ParentImageHandle field of the Load Image Protocol for all SMM Drivers loaded
// by the SMM Core
//
mSmmCorePrivateData.SmmIplImageHandle = ImageHandle;
//
// Get SMM Access Protocol
//
Status = gBS->LocateProtocol (&gEfiSmmAccess2ProtocolGuid, NULL, (VOID **)&mSmmAccess);
ASSERT_EFI_ERROR (Status);
//
// Get SMM Control2 Protocol
//
Status = gBS->LocateProtocol (&gEfiSmmControl2ProtocolGuid, NULL, (VOID **)&mSmmControl2);
ASSERT_EFI_ERROR (Status);
//
// Get SMM Configuration Protocol if it is present
//
SmmConfiguration = NULL;
Status = gBS->LocateProtocol (&gEfiSmmConfigurationProtocolGuid, NULL, (VOID **) &SmmConfiguration);
//
// Get SMRAM information
//
Size = 0;
Status = mSmmAccess->GetCapabilities (mSmmAccess, &Size, NULL);
ASSERT (Status == EFI_BUFFER_TOO_SMALL);
gSmmCorePrivate->SmramRanges = (EFI_SMRAM_DESCRIPTOR *)AllocatePool (Size);
ASSERT (gSmmCorePrivate->SmramRanges != NULL);
Status = mSmmAccess->GetCapabilities (mSmmAccess, &Size, gSmmCorePrivate->SmramRanges);
ASSERT_EFI_ERROR (Status);
gSmmCorePrivate->SmramRangeCount = Size / sizeof (EFI_SMRAM_DESCRIPTOR);
//
// Open all SMRAM ranges
//
Status = mSmmAccess->Open (mSmmAccess);
ASSERT_EFI_ERROR (Status);
//
// Print debug message that the SMRAM window is now open.
//
DEBUG ((DEBUG_INFO, "SMM IPL opened SMRAM window\n"));
//
// Subtract SMRAM any reserved SMRAM regions.
//
if (SmmConfiguration != NULL) {
SmramResRegion = SmmConfiguration->SmramReservedRegions;
while (SmramResRegion->SmramReservedSize != 0) {
for (Index = 0; Index < gSmmCorePrivate->SmramRangeCount; Index ++) {
if ((SmramResRegion->SmramReservedStart >= gSmmCorePrivate->SmramRanges[Index].CpuStart) && \
((SmramResRegion->SmramReservedStart + SmramResRegion->SmramReservedSize) <= \
(gSmmCorePrivate->SmramRanges[Index].CpuStart + gSmmCorePrivate->SmramRanges[Index].PhysicalSize))) {
//
// This range has reserved area, calculate the left free size
//
gSmmCorePrivate->SmramRanges[Index].PhysicalSize = SmramResRegion->SmramReservedStart - gSmmCorePrivate->SmramRanges[Index].CpuStart;
}
}
SmramResRegion++;
}
}
//
// Find the largest SMRAM range between 1MB and 4GB that is at least 1MB in size
//
mCurrentSmramRange = NULL;
for (Index = 0, MaxSize = SIZE_1MB; Index < gSmmCorePrivate->SmramRangeCount; Index++) {
if (gSmmCorePrivate->SmramRanges[Index].CpuStart >= BASE_1MB) {
if ((gSmmCorePrivate->SmramRanges[Index].CpuStart + gSmmCorePrivate->SmramRanges[Index].PhysicalSize) <= BASE_4GB) {
if (gSmmCorePrivate->SmramRanges[Index].PhysicalSize >= MaxSize) {
MaxSize = gSmmCorePrivate->SmramRanges[Index].PhysicalSize;
mCurrentSmramRange = &gSmmCorePrivate->SmramRanges[Index];
}
}
}
}
if (mCurrentSmramRange != NULL) {
//
// Print debug message showing SMRAM window that will be used by SMM IPL and SMM Core
//
DEBUG ((DEBUG_INFO, "SMM IPL found SMRAM window %p - %p\n",
(VOID *)(UINTN)mCurrentSmramRange->CpuStart,
(VOID *)(UINTN)(mCurrentSmramRange->CpuStart + mCurrentSmramRange->PhysicalSize - 1)
));
//
// Attempt to set SMRAM cacheability to WB
//
Status = gDS->SetMemorySpaceAttributes(
mCurrentSmramRange->CpuStart,
mCurrentSmramRange->PhysicalSize,
EFI_MEMORY_WB
);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_WARN, "SMM IPL failed to set SMRAM window to EFI_MEMORY_WB\n"));
}
//
// Load SMM Core into SMRAM and execute it from SMRAM
//
Status = ExecuteSmmCoreFromSmram (mCurrentSmramRange, gSmmCorePrivate);
if (EFI_ERROR (Status)) {
//
// Print error message that the SMM Core failed to be loaded and executed.
//
DEBUG ((DEBUG_ERROR, "SMM IPL could not load and execute SMM Core from SMRAM\n"));
//
// Attempt to reset SMRAM cacheability to UC
//
Status = gDS->SetMemorySpaceAttributes(
mCurrentSmramRange->CpuStart,
mCurrentSmramRange->PhysicalSize,
EFI_MEMORY_UC
);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_WARN, "SMM IPL failed to reset SMRAM window to EFI_MEMORY_UC\n"));
}
}
} else {
//
// Print error message that there are not enough SMRAM resources to load the SMM Core.
//
DEBUG ((DEBUG_ERROR, "SMM IPL could not find a large enough SMRAM region to load SMM Core\n"));
}
//
// If the SMM Core could not be loaded then close SMRAM window, free allocated
// resources, and return an error so SMM IPL will be unloaded.
//
if (mCurrentSmramRange == NULL || EFI_ERROR (Status)) {
//
// Close all SMRAM ranges
//
Status = mSmmAccess->Close (mSmmAccess);
ASSERT_EFI_ERROR (Status);
//
// Print debug message that the SMRAM window is now closed.
//
DEBUG ((DEBUG_INFO, "SMM IPL closed SMRAM window\n"));
//
// Free all allocated resources
//
FreePool (gSmmCorePrivate->SmramRanges);
return EFI_UNSUPPORTED;
}
//
// Install SMM Base2 Protocol and SMM Communication Protocol
//
Status = gBS->InstallMultipleProtocolInterfaces (
&mSmmIplHandle,
&gEfiSmmBase2ProtocolGuid, &mSmmBase2,
&gEfiSmmCommunicationProtocolGuid, &mSmmCommunication,
NULL
);
ASSERT_EFI_ERROR (Status);
//
// Create the set of protocol and event notififcations that the SMM IPL requires
//
for (Index = 0; mSmmIplEvents[Index].NotifyFunction != NULL; Index++) {
if (mSmmIplEvents[Index].Protocol) {
mSmmIplEvents[Index].Event = EfiCreateProtocolNotifyEvent (
mSmmIplEvents[Index].Guid,
TPL_CALLBACK,
mSmmIplEvents[Index].NotifyFunction,
mSmmIplEvents[Index].NotifyContext,
&Registration
);
} else {
Status = gBS->CreateEventEx (
EVT_NOTIFY_SIGNAL,
TPL_CALLBACK,
mSmmIplEvents[Index].NotifyFunction,
mSmmIplEvents[Index].NotifyContext,
mSmmIplEvents[Index].Guid,
&mSmmIplEvents[Index].Event
);
ASSERT_EFI_ERROR (Status);
}
}
return EFI_SUCCESS;
}
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