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PiSmmIpl.c
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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 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <PiDxe.h>
#include <Protocol/SmmBase2.h>
#include <Protocol/SmmCommunication.h>
#include <Protocol/MmCommunication2.h>
#include <Protocol/SmmAccess2.h>
#include <Protocol/SmmConfiguration.h>
#include <Protocol/SmmControl2.h>
#include <Protocol/DxeSmmReadyToLock.h>
#include <Protocol/Cpu.h>
#include <Guid/EventGroup.h>
#include <Guid/EventLegacyBios.h>
#include <Guid/LoadModuleAtFixedAddress.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/DxeServicesLib.h>
#include <Library/UefiLib.h>
#include <Library/UefiRuntimeLib.h>
#include <Library/PcdLib.h>
#include <Library/ReportStatusCodeLib.h>
#include "PiSmmCorePrivateData.h"
#define SMRAM_CAPABILITIES (EFI_MEMORY_WB | EFI_MEMORY_UC)
//
// 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.
This parameter is optional and may be NULL.
@retval EFI_SUCCESS The message was successfully posted.
@retval EFI_INVALID_PARAMETER The CommBuffer was NULL.
@retval EFI_BAD_BUFFER_SIZE The buffer is too large for the MM implementation.
If this error is returned, the MessageLength field
in the CommBuffer header or the integer pointed by
CommSize, are updated to reflect the maximum payload
size the implementation can accommodate.
@retval EFI_ACCESS_DENIED The CommunicateBuffer parameter or CommSize parameter,
if not omitted, are in address range that cannot be
accessed by the MM environment.
**/
EFI_STATUS
EFIAPI
SmmCommunicationCommunicate (
IN CONST EFI_SMM_COMMUNICATION_PROTOCOL *This,
IN OUT VOID *CommBuffer,
IN OUT UINTN *CommSize OPTIONAL
);
/**
Communicates with a registered handler.
This function provides a service to send and receive messages from a registered UEFI service.
@param[in] This The EFI_MM_COMMUNICATION_PROTOCOL instance.
@param[in] CommBufferPhysical Physical address of the MM communication buffer
@param[in] CommBufferVirtual Virtual address of the MM communication buffer
@param[in] 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.
This parameter is optional and may be NULL.
@retval EFI_SUCCESS The message was successfully posted.
@retval EFI_INVALID_PARAMETER The CommBuffer was NULL.
@retval EFI_BAD_BUFFER_SIZE The buffer is too large for the MM implementation.
If this error is returned, the MessageLength field
in the CommBuffer header or the integer pointed by
CommSize, are updated to reflect the maximum payload
size the implementation can accommodate.
@retval EFI_ACCESS_DENIED The CommunicateBuffer parameter or CommSize parameter,
if not omitted, are in address range that cannot be
accessed by the MM environment.
**/
EFI_STATUS
EFIAPI
SmmCommunicationMmCommunicate2 (
IN CONST EFI_MM_COMMUNICATION2_PROTOCOL *This,
IN OUT VOID *CommBufferPhysical,
IN OUT VOID *CommBufferVirtual,
IN OUT UINTN *CommSize OPTIONAL
);
/**
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
SmmIplDxeDispatchEventNotify (
IN EFI_EVENT Event,
IN VOID *Context
);
/**
Event notification that is fired when a GUIDed 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
);
/**
Event notification that is fired when EndOfDxe Event Group is signaled.
@param Event The Event that is being processed, not used.
@param Context Event Context, not used.
**/
VOID
EFIAPI
SmmIplEndOfDxeEventNotify (
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_TPL NotifyTpl;
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
};
//
// PI 1.7 MM Communication Protocol 2 instance
//
EFI_MM_COMMUNICATION2_PROTOCOL mMmCommunication2 = {
SmmCommunicationMmCommunicate2
};
//
// 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
NULL, // CommunicationBuffer
0, // BufferSize
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;
BOOLEAN mEndOfDxe = FALSE;
EFI_PHYSICAL_ADDRESS mSmramCacheBase;
UINT64 mSmramCacheSize;
EFI_SMM_COMMUNICATE_HEADER mCommunicateHeader;
EFI_LOAD_FIXED_ADDRESS_CONFIGURATION_TABLE *mLMFAConfigurationTable = NULL;
//
// 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 established,
// 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, TPL_NOTIFY, NULL },
//
// Declare protocol notification on DxeSmmReadyToLock protocols. When this notification is established,
// 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, TPL_CALLBACK, NULL },
//
// Declare event notification on EndOfDxe event. When this notification is established,
// the associated event is immediately signalled, so the notification function will be executed and the
// SMM End Of Dxe Protocol will be found if it is already in the handle database.
//
{ FALSE, TRUE, &gEfiEndOfDxeEventGroupGuid, SmmIplGuidedEventNotify, &gEfiEndOfDxeEventGroupGuid, TPL_CALLBACK, NULL },
//
// Declare event notification on EndOfDxe event. This is used to set EndOfDxe event signaled flag.
//
{ FALSE, TRUE, &gEfiEndOfDxeEventGroupGuid, SmmIplEndOfDxeEventNotify, &gEfiEndOfDxeEventGroupGuid, TPL_CALLBACK, 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, SmmIplDxeDispatchEventNotify, &gEfiEventDxeDispatchGuid, TPL_CALLBACK, 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, TPL_CALLBACK, 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.
// It is also to inform the SMM Core to notify SMM driver that system enter legacy boot.
//
{ FALSE, FALSE, &gEfiEventLegacyBootGuid, SmmIplGuidedEventNotify, &gEfiEventLegacyBootGuid, TPL_CALLBACK, NULL },
//
// Declare event notification on Exit Boot Services Event Group. This is used to inform the SMM Core
// to notify SMM driver that system enter exit boot services.
//
{ FALSE, FALSE, &gEfiEventExitBootServicesGuid, SmmIplGuidedEventNotify, &gEfiEventExitBootServicesGuid, TPL_CALLBACK, NULL },
//
// Declare event notification on Ready To Boot Event Group. This is used to inform the SMM Core
// to notify SMM driver that system enter ready to boot.
//
{ FALSE, FALSE, &gEfiEventReadyToBootGuid, SmmIplGuidedEventNotify, &gEfiEventReadyToBootGuid, TPL_CALLBACK, 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, TPL_CALLBACK, NULL },
//
// Terminate the table of event notifications
//
{ FALSE, FALSE, NULL, NULL, NULL, TPL_CALLBACK, NULL }
};
/**
Find the maximum SMRAM cache range that covers the range specified by SmramRange.
This function searches and joins all adjacent ranges of SmramRange into a range to be cached.
@param SmramRange The SMRAM range to search from.
@param SmramCacheBase The returned cache range base.
@param SmramCacheSize The returned cache range size.
**/
VOID
GetSmramCacheRange (
IN EFI_SMRAM_DESCRIPTOR *SmramRange,
OUT EFI_PHYSICAL_ADDRESS *SmramCacheBase,
OUT UINT64 *SmramCacheSize
)
{
UINTN Index;
EFI_PHYSICAL_ADDRESS RangeCpuStart;
UINT64 RangePhysicalSize;
BOOLEAN FoundAjacentRange;
*SmramCacheBase = SmramRange->CpuStart;
*SmramCacheSize = SmramRange->PhysicalSize;
do {
FoundAjacentRange = FALSE;
for (Index = 0; Index < gSmmCorePrivate->SmramRangeCount; Index++) {
RangeCpuStart = gSmmCorePrivate->SmramRanges[Index].CpuStart;
RangePhysicalSize = gSmmCorePrivate->SmramRanges[Index].PhysicalSize;
if ((RangeCpuStart < *SmramCacheBase) && (*SmramCacheBase == (RangeCpuStart + RangePhysicalSize))) {
*SmramCacheBase = RangeCpuStart;
*SmramCacheSize += RangePhysicalSize;
FoundAjacentRange = TRUE;
} else if (((*SmramCacheBase + *SmramCacheSize) == RangeCpuStart) && (RangePhysicalSize > 0)) {
*SmramCacheSize += RangePhysicalSize;
FoundAjacentRange = TRUE;
}
}
} while (FoundAjacentRange);
}
/**
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.
This parameter is optional and may be NULL.
@retval EFI_SUCCESS The message was successfully posted.
@retval EFI_INVALID_PARAMETER The CommBuffer was NULL.
@retval EFI_BAD_BUFFER_SIZE The buffer is too large for the MM implementation.
If this error is returned, the MessageLength field
in the CommBuffer header or the integer pointed by
CommSize, are updated to reflect the maximum payload
size the implementation can accommodate.
@retval EFI_ACCESS_DENIED The CommunicateBuffer parameter or CommSize parameter,
if not omitted, are in address range that cannot be
accessed by the MM environment.
**/
EFI_STATUS
EFIAPI
SmmCommunicationCommunicate (
IN CONST EFI_SMM_COMMUNICATION_PROTOCOL *This,
IN OUT VOID *CommBuffer,
IN OUT UINTN *CommSize OPTIONAL
)
{
EFI_STATUS Status;
EFI_SMM_COMMUNICATE_HEADER *CommunicateHeader;
BOOLEAN OldInSmm;
UINTN TempCommSize;
//
// Check parameters
//
if (CommBuffer == NULL) {
return EFI_INVALID_PARAMETER;
}
CommunicateHeader = (EFI_SMM_COMMUNICATE_HEADER *)CommBuffer;
if (CommSize == NULL) {
TempCommSize = OFFSET_OF (EFI_SMM_COMMUNICATE_HEADER, Data) + CommunicateHeader->MessageLength;
} else {
TempCommSize = *CommSize;
//
// CommSize must hold HeaderGuid and MessageLength
//
if (TempCommSize < OFFSET_OF (EFI_SMM_COMMUNICATE_HEADER, Data)) {
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 = TempCommSize;
//
// Generate Software SMI
//
Status = mSmmControl2->Trigger (mSmmControl2, NULL, NULL, FALSE, 0);
if (EFI_ERROR (Status)) {
return EFI_UNSUPPORTED;
}
//
// Return status from software SMI
//
if (CommSize != NULL) {
*CommSize = gSmmCorePrivate->BufferSize;
}
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 allowed,
// so return EFI_INVALID_PARAMETER.
//
if (EfiGoneVirtual ()) {
return EFI_INVALID_PARAMETER;
}
//
// If we are not in SMM, don't allow call SmiManage() directly when SMRAM is closed or locked.
//
if ((!gSmmCorePrivate->InSmm) && (!mSmmAccess->OpenState || mSmmAccess->LockState)) {
return EFI_INVALID_PARAMETER;
}
//
// Save current InSmm state and set InSmm state to TRUE
//
OldInSmm = gSmmCorePrivate->InSmm;
gSmmCorePrivate->InSmm = TRUE;
//
// Before SetVirtualAddressMap(), we are in SMM or SMRAM is open and unlocked, call SmiManage() directly.
//
TempCommSize -= OFFSET_OF (EFI_SMM_COMMUNICATE_HEADER, Data);
Status = gSmmCorePrivate->Smst->SmiManage (
&CommunicateHeader->HeaderGuid,
NULL,
CommunicateHeader->Data,
&TempCommSize
);
TempCommSize += OFFSET_OF (EFI_SMM_COMMUNICATE_HEADER, Data);
if (CommSize != NULL) {
*CommSize = TempCommSize;
}
//
// Restore original InSmm state
//
gSmmCorePrivate->InSmm = OldInSmm;
return (Status == EFI_SUCCESS) ? EFI_SUCCESS : EFI_NOT_FOUND;
}
/**
Communicates with a registered handler.
This function provides a service to send and receive messages from a registered UEFI service.
@param[in] This The EFI_MM_COMMUNICATION_PROTOCOL instance.
@param[in] CommBufferPhysical Physical address of the MM communication buffer
@param[in] CommBufferVirtual Virtual address of the MM communication buffer
@param[in] 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.
This parameter is optional and may be NULL.
@retval EFI_SUCCESS The message was successfully posted.
@retval EFI_INVALID_PARAMETER The CommBuffer was NULL.
@retval EFI_BAD_BUFFER_SIZE The buffer is too large for the MM implementation.
If this error is returned, the MessageLength field
in the CommBuffer header or the integer pointed by
CommSize, are updated to reflect the maximum payload
size the implementation can accommodate.
@retval EFI_ACCESS_DENIED The CommunicateBuffer parameter or CommSize parameter,
if not omitted, are in address range that cannot be
accessed by the MM environment.
**/
EFI_STATUS
EFIAPI
SmmCommunicationMmCommunicate2 (
IN CONST EFI_MM_COMMUNICATION2_PROTOCOL *This,
IN OUT VOID *CommBufferPhysical,
IN OUT VOID *CommBufferVirtual,
IN OUT UINTN *CommSize OPTIONAL
)
{
return SmmCommunicationCommunicate (
&mSmmCommunication,
CommBufferPhysical,
CommSize
);
}
/**
Event notification that is fired when GUIDed 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
)
{
UINTN Size;
//
// Use Guid to initialize EFI_SMM_COMMUNICATE_HEADER structure
//
CopyGuid (&mCommunicateHeader.HeaderGuid, (EFI_GUID *)Context);
mCommunicateHeader.MessageLength = 1;
mCommunicateHeader.Data[0] = 0;
//
// Generate the Software SMI and return the result
//
Size = sizeof (mCommunicateHeader);
SmmCommunicationCommunicate (&mSmmCommunication, &mCommunicateHeader, &Size);
}
/**
Event notification that is fired when EndOfDxe Event Group is signaled.
@param Event The Event that is being processed, not used.
@param Context Event Context, not used.
**/
VOID
EFIAPI
SmmIplEndOfDxeEventNotify (
IN EFI_EVENT Event,
IN VOID *Context
)
{
mEndOfDxe = TRUE;
}
/**
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
SmmIplDxeDispatchEventNotify (
IN EFI_EVENT Event,
IN VOID *Context
)
{
UINTN Size;
EFI_STATUS Status;
//
// Keep calling the SMM Core Dispatcher until there is no request to restart it.
//
while (TRUE) {
//
// Use Guid to initialize EFI_SMM_COMMUNICATE_HEADER structure
// Clear the buffer passed into the Software SMI. This buffer will return
// the status of the SMM Core Dispatcher.
//
CopyGuid (&mCommunicateHeader.HeaderGuid, (EFI_GUID *)Context);
mCommunicateHeader.MessageLength = 1;
mCommunicateHeader.Data[0] = 0;
//
// Generate the Software SMI and return the result
//
Size = sizeof (mCommunicateHeader);
SmmCommunicationCommunicate (&mSmmCommunication, &mCommunicateHeader, &Size);
//
// Return if there is no request to restart the SMM Core Dispatcher
//
if (mCommunicateHeader.Data[0] != COMM_BUFFER_SMM_DISPATCH_RESTART) {
return;
}
//
// Close all SMRAM ranges to protect SMRAM
// NOTE: SMRR is enabled by CPU SMM driver by calling SmmCpuFeaturesInitializeProcessor() from SmmCpuFeaturesLib
// so no need to reset the SMRAM to UC in MTRR.
//
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 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 SMM 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));
}
/**
Event notification that is fired every time a DxeSmmReadyToLock protocol is added
or if gEfiEventReadyToBootGuid is signaled.
@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
// signaled, 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"));
}
if (!mEndOfDxe) {
DEBUG ((DEBUG_ERROR, "EndOfDxe Event must be signaled before DxeSmmReadyToLock Protocol installation!\n"));
REPORT_STATUS_CODE (
EFI_ERROR_CODE | EFI_ERROR_UNRECOVERED,
(EFI_SOFTWARE_SMM_DRIVER | EFI_SW_EC_ILLEGAL_SOFTWARE_STATE)
);
ASSERT (FALSE);
}
//
// 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);
}
/**
Get the fixed loading address from image header assigned by build tool. This function only be called
when Loading module at Fixed address feature enabled.
@param ImageContext Pointer to the image context structure that describes the PE/COFF
image that needs to be examined by this function.
@retval EFI_SUCCESS An fixed loading address is assigned to this image by build tools .
@retval EFI_NOT_FOUND The image has no assigned fixed loading address.
**/
EFI_STATUS
GetPeCoffImageFixLoadingAssignedAddress (
IN OUT PE_COFF_LOADER_IMAGE_CONTEXT *ImageContext
)
{
UINTN SectionHeaderOffset;
EFI_STATUS Status;
EFI_IMAGE_SECTION_HEADER SectionHeader;
EFI_IMAGE_OPTIONAL_HEADER_UNION *ImgHdr;
EFI_PHYSICAL_ADDRESS FixLoadingAddress;
UINT16 Index;
UINTN Size;
UINT16 NumberOfSections;
EFI_PHYSICAL_ADDRESS SmramBase;
UINT64 SmmCodeSize;
UINT64 ValueInSectionHeader;
//
// Build tool will calculate the smm code size and then patch the PcdLoadFixAddressSmmCodePageNumber
//
SmmCodeSize = EFI_PAGES_TO_SIZE (PcdGet32 (PcdLoadFixAddressSmmCodePageNumber));
FixLoadingAddress = 0;
Status = EFI_NOT_FOUND;
SmramBase = mLMFAConfigurationTable->SmramBase;
//
// Get PeHeader pointer
//
ImgHdr = (EFI_IMAGE_OPTIONAL_HEADER_UNION *)((CHAR8 *)ImageContext->Handle + ImageContext->PeCoffHeaderOffset);
SectionHeaderOffset = ImageContext->PeCoffHeaderOffset +
sizeof (UINT32) +
sizeof (EFI_IMAGE_FILE_HEADER) +
ImgHdr->Pe32.FileHeader.SizeOfOptionalHeader;
NumberOfSections = ImgHdr->Pe32.FileHeader.NumberOfSections;
//
// Get base address from the first section header that doesn't point to code section.
//
for (Index = 0; Index < NumberOfSections; Index++) {
//
// Read section header from file
//
Size = sizeof (EFI_IMAGE_SECTION_HEADER);
Status = ImageContext->ImageRead (
ImageContext->Handle,
SectionHeaderOffset,
&Size,
&SectionHeader
);
if (EFI_ERROR (Status)) {
return Status;
}
Status = EFI_NOT_FOUND;
if ((SectionHeader.Characteristics & EFI_IMAGE_SCN_CNT_CODE) == 0) {
//
// Build tool saves the offset to SMRAM base as image base in PointerToRelocations & PointerToLineNumbers fields in the
// first section header that doesn't point to code section in image header. And there is an assumption that when the
// feature is enabled, if a module is assigned a loading address by tools, PointerToRelocations & PointerToLineNumbers
// fields should NOT be Zero, or else, these 2 fields should be set to Zero
//
ValueInSectionHeader = ReadUnaligned64 ((UINT64 *)&SectionHeader.PointerToRelocations);
if (ValueInSectionHeader != 0) {
//
// Found first section header that doesn't point to code section in which build tool saves the
// offset to SMRAM base as image base in PointerToRelocations & PointerToLineNumbers fields
//
FixLoadingAddress = (EFI_PHYSICAL_ADDRESS)(SmramBase + (INT64)ValueInSectionHeader);
if ((SmramBase + SmmCodeSize > FixLoadingAddress) && (SmramBase <= FixLoadingAddress)) {
//
// The assigned address is valid. Return the specified loading address
//
ImageContext->ImageAddress = FixLoadingAddress;
Status = EFI_SUCCESS;
}
}
break;
}
SectionHeaderOffset += sizeof (EFI_IMAGE_SECTION_HEADER);
}
DEBUG ((DEBUG_INFO|DEBUG_LOAD, "LOADING MODULE FIXED INFO: Loading module at fixed address %x, Status = %r \n", FixLoadingAddress, Status));