/** @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" | |
#include <Library/SafeIntLib.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)); | |
return Status; | |
} | |
/** | |
Load the SMM Core image into SMRAM and executes the SMM Core from SMRAM. | |
@param[in, out] SmramRange Descriptor for the range of SMRAM to reload the | |
currently executing image, the rang of SMRAM to | |
hold SMM Core will be excluded. | |
@param[in, out] SmramRangeSmmCore Descriptor for the range of SMRAM to hold SMM Core. | |
@param[in] Context Context to pass into SMM Core | |
@return EFI_STATUS | |
**/ | |
EFI_STATUS | |
ExecuteSmmCoreFromSmram ( | |
IN OUT EFI_SMRAM_DESCRIPTOR *SmramRange, | |
IN OUT EFI_SMRAM_DESCRIPTOR *SmramRangeSmmCore, | |
IN VOID *Context | |
) | |
{ | |
EFI_STATUS Status; | |
VOID *SourceBuffer; | |
UINTN SourceSize; | |
PE_COFF_LOADER_IMAGE_CONTEXT ImageContext; | |
UINTN PageCount; | |
EFI_IMAGE_ENTRY_POINT EntryPoint; | |
// | |
// Search all Firmware Volumes for a PE/COFF image in a file of type SMM_CORE | |
// | |
Status = GetSectionFromAnyFvByFileType ( | |
EFI_FV_FILETYPE_SMM_CORE, | |
0, | |
EFI_SECTION_PE32, | |
0, | |
&SourceBuffer, | |
&SourceSize | |
); | |
if (EFI_ERROR (Status)) { | |
return Status; | |
} | |
// | |
// Initialize ImageContext | |
// | |
ImageContext.Handle = SourceBuffer; | |
ImageContext.ImageRead = PeCoffLoaderImageReadFromMemory; | |
// | |
// Get information about the image being loaded | |
// | |
Status = PeCoffLoaderGetImageInfo (&ImageContext); | |
if (EFI_ERROR (Status)) { | |
return Status; | |
} | |
// | |
// if Loading module at Fixed Address feature is enabled, the SMM core driver will be loaded to | |
// the address assigned by build tool. | |
// | |
if (PcdGet64 (PcdLoadModuleAtFixAddressEnable) != 0) { | |
// | |
// Get the fixed loading address assigned by Build tool | |
// | |
Status = GetPeCoffImageFixLoadingAssignedAddress (&ImageContext); | |
if (!EFI_ERROR (Status)) { | |
// | |
// Since the memory range to load SMM CORE will be cut out in SMM core, so no need to allocate and free this range | |
// | |
PageCount = 0; | |
// | |
// Reserved Smram Region for SmmCore is not used, and remove it from SmramRangeCount. | |
// | |
gSmmCorePrivate->SmramRangeCount--; | |
} else { | |
DEBUG ((DEBUG_INFO, "LOADING MODULE FIXED ERROR: Loading module at fixed address at address failed\n")); | |
// | |
// Allocate memory for the image being loaded from the EFI_SRAM_DESCRIPTOR | |
// specified by SmramRange | |
// | |
PageCount = (UINTN)EFI_SIZE_TO_PAGES ((UINTN)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); | |
SmramRangeSmmCore->CpuStart = SmramRange->CpuStart + SmramRange->PhysicalSize; | |
SmramRangeSmmCore->PhysicalStart = SmramRange->PhysicalStart + SmramRange->PhysicalSize; | |
SmramRangeSmmCore->RegionState = SmramRange->RegionState | EFI_ALLOCATED; | |
SmramRangeSmmCore->PhysicalSize = EFI_PAGES_TO_SIZE (PageCount); | |
// | |
// Align buffer on section boundary | |
// | |
ImageContext.ImageAddress = SmramRangeSmmCore->CpuStart; | |
} | |
} else { | |
// | |
// Allocate memory for the image being loaded from the EFI_SRAM_DESCRIPTOR | |
// specified by SmramRange | |
// | |
PageCount = (UINTN)EFI_SIZE_TO_PAGES ((UINTN)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); | |
SmramRangeSmmCore->CpuStart = SmramRange->CpuStart + SmramRange->PhysicalSize; | |
SmramRangeSmmCore->PhysicalStart = SmramRange->PhysicalStart + SmramRange->PhysicalSize; | |
SmramRangeSmmCore->RegionState = SmramRange->RegionState | EFI_ALLOCATED; | |
SmramRangeSmmCore->PhysicalSize = EFI_PAGES_TO_SIZE (PageCount); | |
// | |
// Align buffer on section boundary | |
// | |
ImageContext.ImageAddress = SmramRangeSmmCore->CpuStart; | |
} | |
ImageContext.ImageAddress += ImageContext.SectionAlignment - 1; | |
ImageContext.ImageAddress &= ~((EFI_PHYSICAL_ADDRESS)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)); | |
gSmmCorePrivate->PiSmmCoreImageBase = ImageContext.ImageAddress; | |
gSmmCorePrivate->PiSmmCoreImageSize = ImageContext.ImageSize; | |
DEBUG ((DEBUG_INFO, "PiSmmCoreImageBase - 0x%016lx\n", gSmmCorePrivate->PiSmmCoreImageBase)); | |
DEBUG ((DEBUG_INFO, "PiSmmCoreImageSize - 0x%016lx\n", gSmmCorePrivate->PiSmmCoreImageSize)); | |
gSmmCorePrivate->PiSmmCoreEntryPoint = ImageContext.EntryPoint; | |
// | |
// Execute image | |
// | |
EntryPoint = (EFI_IMAGE_ENTRY_POINT)(UINTN)ImageContext.EntryPoint; | |
Status = EntryPoint ((EFI_HANDLE)Context, gST); | |
} | |
} | |
// | |
// Always free memory allocated by GetFileBufferByFilePath () | |
// | |
FreePool (SourceBuffer); | |
return Status; | |
} | |
/** | |
SMM split SMRAM entry. | |
@param[in, out] RangeToCompare Pointer to EFI_SMRAM_DESCRIPTOR to compare. | |
@param[in, out] ReservedRangeToCompare Pointer to EFI_SMM_RESERVED_SMRAM_REGION to compare. | |
@param[out] Ranges Output pointer to hold split EFI_SMRAM_DESCRIPTOR entry. | |
@param[in, out] RangeCount Pointer to range count. | |
@param[out] ReservedRanges Output pointer to hold split EFI_SMM_RESERVED_SMRAM_REGION entry. | |
@param[in, out] ReservedRangeCount Pointer to reserved range count. | |
@param[out] FinalRanges Output pointer to hold split final EFI_SMRAM_DESCRIPTOR entry | |
that no need to be split anymore. | |
@param[in, out] FinalRangeCount Pointer to final range count. | |
**/ | |
VOID | |
SmmSplitSmramEntry ( | |
IN OUT EFI_SMRAM_DESCRIPTOR *RangeToCompare, | |
IN OUT EFI_SMM_RESERVED_SMRAM_REGION *ReservedRangeToCompare, | |
OUT EFI_SMRAM_DESCRIPTOR *Ranges, | |
IN OUT UINTN *RangeCount, | |
OUT EFI_SMM_RESERVED_SMRAM_REGION *ReservedRanges, | |
IN OUT UINTN *ReservedRangeCount, | |
OUT EFI_SMRAM_DESCRIPTOR *FinalRanges, | |
IN OUT UINTN *FinalRangeCount | |
) | |
{ | |
UINT64 RangeToCompareEnd; | |
UINT64 ReservedRangeToCompareEnd; | |
RangeToCompareEnd = RangeToCompare->CpuStart + RangeToCompare->PhysicalSize; | |
ReservedRangeToCompareEnd = ReservedRangeToCompare->SmramReservedStart + ReservedRangeToCompare->SmramReservedSize; | |
if ((RangeToCompare->CpuStart >= ReservedRangeToCompare->SmramReservedStart) && | |
(RangeToCompare->CpuStart < ReservedRangeToCompareEnd)) | |
{ | |
if (RangeToCompareEnd < ReservedRangeToCompareEnd) { | |
// | |
// RangeToCompare ReservedRangeToCompare | |
// ---- ---- -------------------------------------- | |
// | | | | -> 1. ReservedRangeToCompare | |
// ---- | | |--| -------------------------------------- | |
// | | | | | | | |
// | | | | | | -> 2. FinalRanges[*FinalRangeCount] and increment *FinalRangeCount | |
// | | | | | | RangeToCompare->PhysicalSize = 0 | |
// ---- | | |--| -------------------------------------- | |
// | | | | -> 3. ReservedRanges[*ReservedRangeCount] and increment *ReservedRangeCount | |
// ---- ---- -------------------------------------- | |
// | |
// | |
// 1. Update ReservedRangeToCompare. | |
// | |
ReservedRangeToCompare->SmramReservedSize = RangeToCompare->CpuStart - ReservedRangeToCompare->SmramReservedStart; | |
// | |
// 2. Update FinalRanges[FinalRangeCount] and increment *FinalRangeCount. | |
// Zero RangeToCompare->PhysicalSize. | |
// | |
FinalRanges[*FinalRangeCount].CpuStart = RangeToCompare->CpuStart; | |
FinalRanges[*FinalRangeCount].PhysicalStart = RangeToCompare->PhysicalStart; | |
FinalRanges[*FinalRangeCount].RegionState = RangeToCompare->RegionState | EFI_ALLOCATED; | |
FinalRanges[*FinalRangeCount].PhysicalSize = RangeToCompare->PhysicalSize; | |
*FinalRangeCount += 1; | |
RangeToCompare->PhysicalSize = 0; | |
// | |
// 3. Update ReservedRanges[*ReservedRangeCount] and increment *ReservedRangeCount. | |
// | |
ReservedRanges[*ReservedRangeCount].SmramReservedStart = FinalRanges[*FinalRangeCount - 1].CpuStart + FinalRanges[*FinalRangeCount - 1].PhysicalSize; | |
ReservedRanges[*ReservedRangeCount].SmramReservedSize = ReservedRangeToCompareEnd - RangeToCompareEnd; | |
*ReservedRangeCount += 1; | |
} else { | |
// | |
// RangeToCompare ReservedRangeToCompare | |
// ---- ---- -------------------------------------- | |
// | | | | -> 1. ReservedRangeToCompare | |
// ---- | | |--| -------------------------------------- | |
// | | | | | | | |
// | | | | | | -> 2. FinalRanges[*FinalRangeCount] and increment *FinalRangeCount | |
// | | | | | | | |
// | | ---- |--| -------------------------------------- | |
// | | | | -> 3. RangeToCompare | |
// ---- ---- -------------------------------------- | |
// | |
// | |
// 1. Update ReservedRangeToCompare. | |
// | |
ReservedRangeToCompare->SmramReservedSize = RangeToCompare->CpuStart - ReservedRangeToCompare->SmramReservedStart; | |
// | |
// 2. Update FinalRanges[FinalRangeCount] and increment *FinalRangeCount. | |
// | |
FinalRanges[*FinalRangeCount].CpuStart = RangeToCompare->CpuStart; | |
FinalRanges[*FinalRangeCount].PhysicalStart = RangeToCompare->PhysicalStart; | |
FinalRanges[*FinalRangeCount].RegionState = RangeToCompare->RegionState | EFI_ALLOCATED; | |
FinalRanges[*FinalRangeCount].PhysicalSize = ReservedRangeToCompareEnd - RangeToCompare->CpuStart; | |
*FinalRangeCount += 1; | |
// | |
// 3. Update RangeToCompare. | |
// | |
RangeToCompare->CpuStart += FinalRanges[*FinalRangeCount - 1].PhysicalSize; | |
RangeToCompare->PhysicalStart += FinalRanges[*FinalRangeCount - 1].PhysicalSize; | |
RangeToCompare->PhysicalSize -= FinalRanges[*FinalRangeCount - 1].PhysicalSize; | |
} | |
} else if ((ReservedRangeToCompare->SmramReservedStart >= RangeToCompare->CpuStart) && | |
(ReservedRangeToCompare->SmramReservedStart < RangeToCompareEnd)) | |
{ | |
if (ReservedRangeToCompareEnd < RangeToCompareEnd) { | |
// | |
// RangeToCompare ReservedRangeToCompare | |
// ---- ---- -------------------------------------- | |
// | | | | -> 1. RangeToCompare | |
// | | ---- |--| -------------------------------------- | |
// | | | | | | | |
// | | | | | | -> 2. FinalRanges[*FinalRangeCount] and increment *FinalRangeCount | |
// | | | | | | ReservedRangeToCompare->SmramReservedSize = 0 | |
// | | ---- |--| -------------------------------------- | |
// | | | | -> 3. Ranges[*RangeCount] and increment *RangeCount | |
// ---- ---- -------------------------------------- | |
// | |
// | |
// 1. Update RangeToCompare. | |
// | |
RangeToCompare->PhysicalSize = ReservedRangeToCompare->SmramReservedStart - RangeToCompare->CpuStart; | |
// | |
// 2. Update FinalRanges[FinalRangeCount] and increment *FinalRangeCount. | |
// ReservedRangeToCompare->SmramReservedSize = 0 | |
// | |
FinalRanges[*FinalRangeCount].CpuStart = ReservedRangeToCompare->SmramReservedStart; | |
FinalRanges[*FinalRangeCount].PhysicalStart = RangeToCompare->PhysicalStart + RangeToCompare->PhysicalSize; | |
FinalRanges[*FinalRangeCount].RegionState = RangeToCompare->RegionState | EFI_ALLOCATED; | |
FinalRanges[*FinalRangeCount].PhysicalSize = ReservedRangeToCompare->SmramReservedSize; | |
*FinalRangeCount += 1; | |
ReservedRangeToCompare->SmramReservedSize = 0; | |
// | |
// 3. Update Ranges[*RangeCount] and increment *RangeCount. | |
// | |
Ranges[*RangeCount].CpuStart = FinalRanges[*FinalRangeCount - 1].CpuStart + FinalRanges[*FinalRangeCount - 1].PhysicalSize; | |
Ranges[*RangeCount].PhysicalStart = FinalRanges[*FinalRangeCount - 1].PhysicalStart + FinalRanges[*FinalRangeCount - 1].PhysicalSize; | |
Ranges[*RangeCount].RegionState = RangeToCompare->RegionState; | |
Ranges[*RangeCount].PhysicalSize = RangeToCompareEnd - ReservedRangeToCompareEnd; | |
*RangeCount += 1; | |
} else { | |
// | |
// RangeToCompare ReservedRangeToCompare | |
// ---- ---- -------------------------------------- | |
// | | | | -> 1. RangeToCompare | |
// | | ---- |--| -------------------------------------- | |
// | | | | | | | |
// | | | | | | -> 2. FinalRanges[*FinalRangeCount] and increment *FinalRangeCount | |
// | | | | | | | |
// ---- | | |--| -------------------------------------- | |
// | | | | -> 3. ReservedRangeToCompare | |
// ---- ---- -------------------------------------- | |
// | |
// | |
// 1. Update RangeToCompare. | |
// | |
RangeToCompare->PhysicalSize = ReservedRangeToCompare->SmramReservedStart - RangeToCompare->CpuStart; | |
// | |
// 2. Update FinalRanges[FinalRangeCount] and increment *FinalRangeCount. | |
// ReservedRangeToCompare->SmramReservedSize = 0 | |
// | |
FinalRanges[*FinalRangeCount].CpuStart = ReservedRangeToCompare->SmramReservedStart; | |
FinalRanges[*FinalRangeCount].PhysicalStart = RangeToCompare->PhysicalStart + RangeToCompare->PhysicalSize; | |
FinalRanges[*FinalRangeCount].RegionState = RangeToCompare->RegionState | EFI_ALLOCATED; | |
FinalRanges[*FinalRangeCount].PhysicalSize = RangeToCompareEnd - ReservedRangeToCompare->SmramReservedStart; | |
*FinalRangeCount += 1; | |
// | |
// 3. Update ReservedRangeToCompare. | |
// | |
ReservedRangeToCompare->SmramReservedStart += FinalRanges[*FinalRangeCount - 1].PhysicalSize; | |
ReservedRangeToCompare->SmramReservedSize -= FinalRanges[*FinalRangeCount - 1].PhysicalSize; | |
} | |
} | |
} | |
/** | |
Returns if SMRAM range and SMRAM reserved range are overlapped. | |
@param[in] RangeToCompare Pointer to EFI_SMRAM_DESCRIPTOR to compare. | |
@param[in] ReservedRangeToCompare Pointer to EFI_SMM_RESERVED_SMRAM_REGION to compare. | |
@retval TRUE There is overlap. | |
@retval TRUE Math error. | |
@retval FALSE There is no overlap. | |
**/ | |
BOOLEAN | |
SmmIsSmramOverlap ( | |
IN EFI_SMRAM_DESCRIPTOR *RangeToCompare, | |
IN EFI_SMM_RESERVED_SMRAM_REGION *ReservedRangeToCompare | |
) | |
{ | |
UINT64 RangeToCompareEnd; | |
UINT64 ReservedRangeToCompareEnd; | |
BOOLEAN IsOverUnderflow1; | |
BOOLEAN IsOverUnderflow2; | |
// Check for over or underflow. | |
IsOverUnderflow1 = EFI_ERROR ( | |
SafeUint64Add ( | |
(UINT64)RangeToCompare->CpuStart, | |
RangeToCompare->PhysicalSize, | |
&RangeToCompareEnd | |
) | |
); | |
IsOverUnderflow2 = EFI_ERROR ( | |
SafeUint64Add ( | |
(UINT64)ReservedRangeToCompare->SmramReservedStart, | |
ReservedRangeToCompare->SmramReservedSize, | |
&ReservedRangeToCompareEnd | |
) | |
); | |
if (IsOverUnderflow1 || IsOverUnderflow2) { | |
return TRUE; | |
} | |
if ((RangeToCompare->CpuStart >= ReservedRangeToCompare->SmramReservedStart) && | |
(RangeToCompare->CpuStart < ReservedRangeToCompareEnd)) | |
{ | |
return TRUE; | |
} else if ((ReservedRangeToCompare->SmramReservedStart >= RangeToCompare->CpuStart) && | |
(ReservedRangeToCompare->SmramReservedStart < RangeToCompareEnd)) | |
{ | |
return TRUE; | |
} | |
return FALSE; | |
} | |
/** | |
Get full SMRAM ranges. | |
It will get SMRAM ranges from SmmAccess protocol and SMRAM reserved ranges from | |
SmmConfiguration protocol, split the entries if there is overlap between them. | |
It will also reserve one entry for SMM core. | |
@param[out] FullSmramRangeCount Output pointer to full SMRAM range count. | |
@return Pointer to full SMRAM ranges. | |
**/ | |
EFI_SMRAM_DESCRIPTOR * | |
GetFullSmramRanges ( | |
OUT UINTN *FullSmramRangeCount | |
) | |
{ | |
EFI_STATUS Status; | |
EFI_SMM_CONFIGURATION_PROTOCOL *SmmConfiguration; | |
UINTN Size; | |
UINTN Index; | |
UINTN Index2; | |
EFI_SMRAM_DESCRIPTOR *FullSmramRanges; | |
UINTN TempSmramRangeCount; | |
UINTN AdditionSmramRangeCount; | |
EFI_SMRAM_DESCRIPTOR *TempSmramRanges; | |
UINTN SmramRangeCount; | |
EFI_SMRAM_DESCRIPTOR *SmramRanges; | |
UINTN SmramReservedCount; | |
EFI_SMM_RESERVED_SMRAM_REGION *SmramReservedRanges; | |
UINTN MaxCount; | |
BOOLEAN Rescan; | |
// | |
// 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); | |
SmramRangeCount = Size / sizeof (EFI_SMRAM_DESCRIPTOR); | |
// | |
// Get SMRAM reserved region count. | |
// | |
SmramReservedCount = 0; | |
if (SmmConfiguration != NULL) { | |
while (SmmConfiguration->SmramReservedRegions[SmramReservedCount].SmramReservedSize != 0) { | |
SmramReservedCount++; | |
} | |
} | |
// | |
// Reserve one entry for SMM Core in the full SMRAM ranges. | |
// | |
AdditionSmramRangeCount = 1; | |
if (PcdGet64 (PcdLoadModuleAtFixAddressEnable) != 0) { | |
// | |
// Reserve two entries for all SMM drivers and SMM Core in the full SMRAM ranges. | |
// | |
AdditionSmramRangeCount = 2; | |
} | |
if (SmramReservedCount == 0) { | |
// | |
// No reserved SMRAM entry from SMM Configuration Protocol. | |
// | |
*FullSmramRangeCount = SmramRangeCount + AdditionSmramRangeCount; | |
Size = (*FullSmramRangeCount) * sizeof (EFI_SMRAM_DESCRIPTOR); | |
FullSmramRanges = (EFI_SMRAM_DESCRIPTOR *)AllocateZeroPool (Size); | |
ASSERT (FullSmramRanges != NULL); | |
Status = mSmmAccess->GetCapabilities (mSmmAccess, &Size, FullSmramRanges); | |
ASSERT_EFI_ERROR (Status); | |
return FullSmramRanges; | |
} | |
// | |
// Why MaxCount = X + 2 * Y? | |
// Take Y = 1 as example below, Y > 1 case is just the iteration of Y = 1. | |
// | |
// X = 1 Y = 1 MaxCount = 3 = 1 + 2 * 1 | |
// ---- ---- | |
// | | ---- |--| | |
// | | | | -> | | | |
// | | ---- |--| | |
// ---- ---- | |
// | |
// X = 2 Y = 1 MaxCount = 4 = 2 + 2 * 1 | |
// ---- ---- | |
// | | | | | |
// | | ---- |--| | |
// | | | | | | | |
// |--| | | -> |--| | |
// | | | | | | | |
// | | ---- |--| | |
// | | | | | |
// ---- ---- | |
// | |
// X = 3 Y = 1 MaxCount = 5 = 3 + 2 * 1 | |
// ---- ---- | |
// | | | | | |
// | | ---- |--| | |
// |--| | | |--| | |
// | | | | -> | | | |
// |--| | | |--| | |
// | | ---- |--| | |
// | | | | | |
// ---- ---- | |
// | |
// ...... | |
// | |
MaxCount = SmramRangeCount + 2 * SmramReservedCount; | |
Size = MaxCount * sizeof (EFI_SMM_RESERVED_SMRAM_REGION); | |
SmramReservedRanges = (EFI_SMM_RESERVED_SMRAM_REGION *)AllocatePool (Size); | |
ASSERT (SmramReservedRanges != NULL); | |
for (Index = 0; Index < SmramReservedCount; Index++) { | |
CopyMem (&SmramReservedRanges[Index], &SmmConfiguration->SmramReservedRegions[Index], sizeof (EFI_SMM_RESERVED_SMRAM_REGION)); | |
} | |
Size = MaxCount * sizeof (EFI_SMRAM_DESCRIPTOR); | |
TempSmramRanges = (EFI_SMRAM_DESCRIPTOR *)AllocatePool (Size); | |
ASSERT (TempSmramRanges != NULL); | |
TempSmramRangeCount = 0; | |
SmramRanges = (EFI_SMRAM_DESCRIPTOR *)AllocatePool (Size); | |
ASSERT (SmramRanges != NULL); | |
Status = mSmmAccess->GetCapabilities (mSmmAccess, &Size, SmramRanges); | |
ASSERT_EFI_ERROR (Status); | |
do { | |
Rescan = FALSE; | |
for (Index = 0; (Index < SmramRangeCount) && !Rescan; Index++) { | |
// | |
// Skip zero size entry. | |
// | |
if (SmramRanges[Index].PhysicalSize != 0) { | |
for (Index2 = 0; (Index2 < SmramReservedCount) && !Rescan; Index2++) { | |
// | |
// Skip zero size entry. | |
// | |
if (SmramReservedRanges[Index2].SmramReservedSize != 0) { | |
if (SmmIsSmramOverlap ( | |
&SmramRanges[Index], | |
&SmramReservedRanges[Index2] | |
)) | |
{ | |
// | |
// There is overlap, need to split entry and then rescan. | |
// | |
SmmSplitSmramEntry ( | |
&SmramRanges[Index], | |
&SmramReservedRanges[Index2], | |
SmramRanges, | |
&SmramRangeCount, | |
SmramReservedRanges, | |
&SmramReservedCount, | |
TempSmramRanges, | |
&TempSmramRangeCount | |
); | |
Rescan = TRUE; | |
} | |
} | |
} | |
if (!Rescan) { | |
// | |
// No any overlap, copy the entry to the temp SMRAM ranges. | |
// Zero SmramRanges[Index].PhysicalSize = 0; | |
// | |
CopyMem (&TempSmramRanges[TempSmramRangeCount++], &SmramRanges[Index], sizeof (EFI_SMRAM_DESCRIPTOR)); | |
SmramRanges[Index].PhysicalSize = 0; | |
} | |
} | |
} | |
} while (Rescan); | |
ASSERT (TempSmramRangeCount <= MaxCount); | |
// | |
// Sort the entries | |
// | |
FullSmramRanges = AllocateZeroPool ((TempSmramRangeCount + AdditionSmramRangeCount) * sizeof (EFI_SMRAM_DESCRIPTOR)); | |
ASSERT (FullSmramRanges != NULL); | |
*FullSmramRangeCount = 0; | |
do { | |
for (Index = 0; Index < TempSmramRangeCount; Index++) { | |
if (TempSmramRanges[Index].PhysicalSize != 0) { | |
break; | |
} | |
} | |
ASSERT (Index < TempSmramRangeCount); | |
for (Index2 = 0; Index2 < TempSmramRangeCount; Index2++) { | |
if ((Index2 != Index) && (TempSmramRanges[Index2].PhysicalSize != 0) && (TempSmramRanges[Index2].CpuStart < TempSmramRanges[Index].CpuStart)) { | |
Index = Index2; | |
} | |
} | |
CopyMem (&FullSmramRanges[*FullSmramRangeCount], &TempSmramRanges[Index], sizeof (EFI_SMRAM_DESCRIPTOR)); | |
*FullSmramRangeCount += 1; | |
TempSmramRanges[Index].PhysicalSize = 0; | |
} while (*FullSmramRangeCount < TempSmramRangeCount); | |
ASSERT (*FullSmramRangeCount == TempSmramRangeCount); | |
*FullSmramRangeCount += AdditionSmramRangeCount; | |
FreePool (SmramRanges); | |
FreePool (SmramReservedRanges); | |
FreePool (TempSmramRanges); | |
return FullSmramRanges; | |
} | |
/** | |
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; | |
UINTN Index; | |
UINT64 MaxSize; | |
VOID *Registration; | |
UINT64 SmmCodeSize; | |
EFI_CPU_ARCH_PROTOCOL *CpuArch; | |
EFI_STATUS SetAttrStatus; | |
EFI_SMRAM_DESCRIPTOR *SmramRangeSmmDriver; | |
EFI_GCD_MEMORY_SPACE_DESCRIPTOR MemDesc; | |
// | |
// 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); | |
gSmmCorePrivate->SmramRanges = GetFullSmramRanges (&gSmmCorePrivate->SmramRangeCount); | |
// | |
// 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")); | |
// | |
// Find the largest SMRAM range between 1MB and 4GB that is at least 256KB - 4K in size | |
// | |
mCurrentSmramRange = NULL; | |
for (Index = 0, MaxSize = SIZE_256KB - EFI_PAGE_SIZE; Index < gSmmCorePrivate->SmramRangeCount; Index++) { | |
// | |
// Skip any SMRAM region that is already allocated, needs testing, or needs ECC initialization | |
// | |
if ((gSmmCorePrivate->SmramRanges[Index].RegionState & (EFI_ALLOCATED | EFI_NEEDS_TESTING | EFI_NEEDS_ECC_INITIALIZATION)) != 0) { | |
continue; | |
} | |
if (gSmmCorePrivate->SmramRanges[Index].CpuStart >= BASE_1MB) { | |
if ((gSmmCorePrivate->SmramRanges[Index].CpuStart + gSmmCorePrivate->SmramRanges[Index].PhysicalSize - 1) <= MAX_ADDRESS) { | |
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) | |
)); | |
GetSmramCacheRange (mCurrentSmramRange, &mSmramCacheBase, &mSmramCacheSize); | |
// | |
// Make sure we can change the desired memory attributes. | |
// | |
Status = gDS->GetMemorySpaceDescriptor ( | |
mSmramCacheBase, | |
&MemDesc | |
); | |
ASSERT_EFI_ERROR (Status); | |
if ((MemDesc.Capabilities & SMRAM_CAPABILITIES) != SMRAM_CAPABILITIES) { | |
gDS->SetMemorySpaceCapabilities ( | |
mSmramCacheBase, | |
mSmramCacheSize, | |
MemDesc.Capabilities | SMRAM_CAPABILITIES | |
); | |
} | |
// | |
// If CPU AP is present, attempt to set SMRAM cacheability to WB and clear | |
// all paging attributes. | |
// Note that it is expected that cacheability of SMRAM has been set to WB if CPU AP | |
// is not available here. | |
// | |
CpuArch = NULL; | |
Status = gBS->LocateProtocol (&gEfiCpuArchProtocolGuid, NULL, (VOID **)&CpuArch); | |
if (!EFI_ERROR (Status)) { | |
MemDesc.Attributes &= ~(EFI_CACHE_ATTRIBUTE_MASK | EFI_MEMORY_ATTRIBUTE_MASK); | |
MemDesc.Attributes |= EFI_MEMORY_WB; | |
Status = gDS->SetMemorySpaceAttributes ( | |
mSmramCacheBase, | |
mSmramCacheSize, | |
MemDesc.Attributes | |
); | |
if (EFI_ERROR (Status)) { | |
DEBUG ((DEBUG_WARN, "SMM IPL failed to set SMRAM window to EFI_MEMORY_WB\n")); | |
} | |
DEBUG_CODE ( | |
gDS->GetMemorySpaceDescriptor ( | |
mSmramCacheBase, | |
&MemDesc | |
); | |
DEBUG ((DEBUG_INFO, "SMRAM attributes: %016lx\n", MemDesc.Attributes)); | |
ASSERT ((MemDesc.Attributes & EFI_MEMORY_ATTRIBUTE_MASK) == 0); | |
); | |
} | |
// | |
// if Loading module at Fixed Address feature is enabled, save the SMRAM base to Load | |
// Modules At Fixed Address Configuration Table. | |
// | |
if (PcdGet64 (PcdLoadModuleAtFixAddressEnable) != 0) { | |
// | |
// Build tool will calculate the smm code size and then patch the PcdLoadFixAddressSmmCodePageNumber | |
// | |
SmmCodeSize = LShiftU64 (PcdGet32 (PcdLoadFixAddressSmmCodePageNumber), EFI_PAGE_SHIFT); | |
// | |
// The SMRAM available memory is assumed to be larger than SmmCodeSize | |
// | |
ASSERT (mCurrentSmramRange->PhysicalSize > SmmCodeSize); | |
// | |
// Retrieve Load modules At fixed address configuration table and save the SMRAM base. | |
// | |
Status = EfiGetSystemConfigurationTable ( | |
&gLoadFixedAddressConfigurationTableGuid, | |
(VOID **)&mLMFAConfigurationTable | |
); | |
if (!EFI_ERROR (Status) && (mLMFAConfigurationTable != NULL)) { | |
mLMFAConfigurationTable->SmramBase = mCurrentSmramRange->CpuStart; | |
// | |
// Print the SMRAM base | |
// | |
DEBUG ((DEBUG_INFO, "LOADING MODULE FIXED INFO: TSEG BASE is %x. \n", mLMFAConfigurationTable->SmramBase)); | |
} | |
// | |
// Fill the Smram range for all SMM code | |
// | |
SmramRangeSmmDriver = &gSmmCorePrivate->SmramRanges[gSmmCorePrivate->SmramRangeCount - 2]; | |
SmramRangeSmmDriver->CpuStart = mCurrentSmramRange->CpuStart; | |
SmramRangeSmmDriver->PhysicalStart = mCurrentSmramRange->PhysicalStart; | |
SmramRangeSmmDriver->RegionState = mCurrentSmramRange->RegionState | EFI_ALLOCATED; | |
SmramRangeSmmDriver->PhysicalSize = SmmCodeSize; | |
mCurrentSmramRange->PhysicalSize -= SmmCodeSize; | |
mCurrentSmramRange->CpuStart = mCurrentSmramRange->CpuStart + SmmCodeSize; | |
mCurrentSmramRange->PhysicalStart = mCurrentSmramRange->PhysicalStart + SmmCodeSize; | |
} | |
// | |
// Load SMM Core into SMRAM and execute it from SMRAM | |
// | |
Status = ExecuteSmmCoreFromSmram ( | |
mCurrentSmramRange, | |
&gSmmCorePrivate->SmramRanges[gSmmCorePrivate->SmramRangeCount - 1], | |
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 | |
// | |
if (CpuArch != NULL) { | |
SetAttrStatus = gDS->SetMemorySpaceAttributes ( | |
mSmramCacheBase, | |
mSmramCacheSize, | |
EFI_MEMORY_UC | |
); | |
if (EFI_ERROR (SetAttrStatus)) { | |
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, | |
&gEfiMmCommunication2ProtocolGuid, | |
&mMmCommunication2, | |
NULL | |
); | |
ASSERT_EFI_ERROR (Status); | |
// | |
// Create the set of protocol and event notifications that the SMM IPL requires | |
// | |
for (Index = 0; mSmmIplEvents[Index].NotifyFunction != NULL; Index++) { | |
if (mSmmIplEvents[Index].Protocol) { | |
mSmmIplEvents[Index].Event = EfiCreateProtocolNotifyEvent ( | |
mSmmIplEvents[Index].Guid, | |
mSmmIplEvents[Index].NotifyTpl, | |
mSmmIplEvents[Index].NotifyFunction, | |
mSmmIplEvents[Index].NotifyContext, | |
&Registration | |
); | |
} else { | |
Status = gBS->CreateEventEx ( | |
EVT_NOTIFY_SIGNAL, | |
mSmmIplEvents[Index].NotifyTpl, | |
mSmmIplEvents[Index].NotifyFunction, | |
mSmmIplEvents[Index].NotifyContext, | |
mSmmIplEvents[Index].Guid, | |
&mSmmIplEvents[Index].Event | |
); | |
ASSERT_EFI_ERROR (Status); | |
} | |
} | |
return EFI_SUCCESS; | |
} |