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audk/StandaloneMmPkg/Core/StandaloneMmCore.c

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/** @file
MM Core Main Entry Point
Copyright (c) 2009 - 2014, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2016 - 2021, Arm Limited. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "StandaloneMmCore.h"
EFI_STATUS
MmDispatcher (
VOID
);
//
// Globals used to initialize the protocol
//
EFI_HANDLE mMmCpuHandle = NULL;
//
// Physical pointer to private structure shared between MM IPL and the MM Core
//
MM_CORE_PRIVATE_DATA *gMmCorePrivate;
//
// MM Core global variable for MM System Table. Only accessed as a physical structure in MMRAM.
//
EFI_MM_SYSTEM_TABLE gMmCoreMmst = {
// The table header for the MMST.
{
MM_MMST_SIGNATURE,
EFI_MM_SYSTEM_TABLE_REVISION,
sizeof (gMmCoreMmst.Hdr)
},
// MmFirmwareVendor
NULL,
// MmFirmwareRevision
0,
// MmInstallConfigurationTable
MmInstallConfigurationTable,
// I/O Service
{
{
(EFI_MM_CPU_IO)MmEfiNotAvailableYetArg5, // MmMemRead
(EFI_MM_CPU_IO)MmEfiNotAvailableYetArg5 // MmMemWrite
},
{
(EFI_MM_CPU_IO)MmEfiNotAvailableYetArg5, // MmIoRead
(EFI_MM_CPU_IO)MmEfiNotAvailableYetArg5 // MmIoWrite
}
},
// Runtime memory services
MmAllocatePool,
MmFreePool,
MmAllocatePages,
MmFreePages,
// MP service
NULL, // MmStartupThisAp
0, // CurrentlyExecutingCpu
0, // NumberOfCpus
NULL, // CpuSaveStateSize
NULL, // CpuSaveState
0, // NumberOfTableEntries
NULL, // MmConfigurationTable
MmInstallProtocolInterface,
MmUninstallProtocolInterface,
MmHandleProtocol,
MmRegisterProtocolNotify,
MmLocateHandle,
MmLocateProtocol,
MmiManage,
MmiHandlerRegister,
MmiHandlerUnRegister
};
//
// Table of MMI Handlers that are registered by the MM Core when it is initialized
//
MM_CORE_MMI_HANDLERS mMmCoreMmiHandlers[] = {
{ MmReadyToLockHandler, &gEfiDxeMmReadyToLockProtocolGuid, NULL, TRUE },
{ MmEndOfDxeHandler, &gEfiEndOfDxeEventGroupGuid, NULL, FALSE },
{ MmExitBootServiceHandler, &gEfiEventExitBootServicesGuid, NULL, FALSE },
{ MmReadyToBootHandler, &gEfiEventReadyToBootGuid, NULL, FALSE },
{ NULL, NULL, NULL, FALSE },
};
EFI_SYSTEM_TABLE *mEfiSystemTable;
UINTN mMmramRangeCount;
EFI_MMRAM_DESCRIPTOR *mMmramRanges;
/**
Place holder function until all the MM System Table Service are available.
Note: This function is only used by MMRAM invocation. It is never used by DXE invocation.
@param Arg1 Undefined
@param Arg2 Undefined
@param Arg3 Undefined
@param Arg4 Undefined
@param Arg5 Undefined
@return EFI_NOT_AVAILABLE_YET
**/
EFI_STATUS
EFIAPI
MmEfiNotAvailableYetArg5 (
UINTN Arg1,
UINTN Arg2,
UINTN Arg3,
UINTN Arg4,
UINTN Arg5
)
{
//
// This function should never be executed. If it does, then the architectural protocols
// have not been designed correctly.
//
return EFI_NOT_AVAILABLE_YET;
}
/**
Software MMI handler that is called when a ExitBoot Service event is signaled.
@param DispatchHandle The unique handle assigned to this handler by MmiHandlerRegister().
@param Context Points to an optional handler context which was specified when the handler was registered.
@param CommBuffer A pointer to a collection of data in memory that will
be conveyed from a non-MM environment into an MM environment.
@param CommBufferSize The size of the CommBuffer.
@return Status Code
**/
EFI_STATUS
EFIAPI
MmExitBootServiceHandler (
IN EFI_HANDLE DispatchHandle,
IN CONST VOID *Context OPTIONAL,
IN OUT VOID *CommBuffer OPTIONAL,
IN OUT UINTN *CommBufferSize OPTIONAL
)
{
EFI_HANDLE MmHandle;
EFI_STATUS Status;
STATIC BOOLEAN mInExitBootServices = FALSE;
Status = EFI_SUCCESS;
if (!mInExitBootServices) {
MmHandle = NULL;
Status = MmInstallProtocolInterface (
&MmHandle,
&gEfiEventExitBootServicesGuid,
EFI_NATIVE_INTERFACE,
NULL
);
}
mInExitBootServices = TRUE;
return Status;
}
/**
Software MMI handler that is called when a ExitBoot Service event is signaled.
@param DispatchHandle The unique handle assigned to this handler by MmiHandlerRegister().
@param Context Points to an optional handler context which was specified when the handler was registered.
@param CommBuffer A pointer to a collection of data in memory that will
be conveyed from a non-MM environment into an MM environment.
@param CommBufferSize The size of the CommBuffer.
@return Status Code
**/
EFI_STATUS
EFIAPI
MmReadyToBootHandler (
IN EFI_HANDLE DispatchHandle,
IN CONST VOID *Context OPTIONAL,
IN OUT VOID *CommBuffer OPTIONAL,
IN OUT UINTN *CommBufferSize OPTIONAL
)
{
EFI_HANDLE MmHandle;
EFI_STATUS Status;
STATIC BOOLEAN mInReadyToBoot = FALSE;
Status = EFI_SUCCESS;
if (!mInReadyToBoot) {
MmHandle = NULL;
Status = MmInstallProtocolInterface (
&MmHandle,
&gEfiEventReadyToBootGuid,
EFI_NATIVE_INTERFACE,
NULL
);
}
mInReadyToBoot = TRUE;
return Status;
}
/**
Software MMI handler that is called when the DxeMmReadyToLock protocol is added
or if gEfiEventReadyToBootGuid is signaled. This function unregisters the
Software SMIs that are nor required after MMRAM is locked and installs the
MM Ready To Lock Protocol so MM Drivers are informed that MMRAM is about
to be locked.
@param DispatchHandle The unique handle assigned to this handler by MmiHandlerRegister().
@param Context Points to an optional handler context which was specified when the handler was registered.
@param CommBuffer A pointer to a collection of data in memory that will
be conveyed from a non-MM environment into an MM environment.
@param CommBufferSize The size of the CommBuffer.
@return Status Code
**/
EFI_STATUS
EFIAPI
MmReadyToLockHandler (
IN EFI_HANDLE DispatchHandle,
IN CONST VOID *Context OPTIONAL,
IN OUT VOID *CommBuffer OPTIONAL,
IN OUT UINTN *CommBufferSize OPTIONAL
)
{
EFI_STATUS Status;
UINTN Index;
EFI_HANDLE MmHandle;
DEBUG ((DEBUG_INFO, "MmReadyToLockHandler\n"));
//
// Unregister MMI Handlers that are no longer required after the MM driver dispatch is stopped
//
for (Index = 0; mMmCoreMmiHandlers[Index].HandlerType != NULL; Index++) {
if (mMmCoreMmiHandlers[Index].UnRegister) {
MmiHandlerUnRegister (mMmCoreMmiHandlers[Index].DispatchHandle);
}
}
//
// Install MM Ready to lock protocol
//
MmHandle = NULL;
Status = MmInstallProtocolInterface (
&MmHandle,
&gEfiMmReadyToLockProtocolGuid,
EFI_NATIVE_INTERFACE,
NULL
);
//
// Make sure MM CPU I/O 2 Protocol has been installed into the handle database
//
// Status = MmLocateProtocol (&EFI_MM_CPU_IO_PROTOCOL_GUID, NULL, &Interface);
//
// Print a message on a debug build if the MM CPU I/O 2 Protocol is not installed
//
// if (EFI_ERROR (Status)) {
// DEBUG ((DEBUG_ERROR, "\nSMM: SmmCpuIo Arch Protocol not present!!\n"));
// }
//
// Assert if the CPU I/O 2 Protocol is not installed
//
// ASSERT_EFI_ERROR (Status);
//
// Display any drivers that were not dispatched because dependency expression
// evaluated to false if this is a debug build
//
// MmDisplayDiscoveredNotDispatched ();
return Status;
}
/**
Software MMI handler that is called when the EndOfDxe event is signaled.
This function installs the MM EndOfDxe Protocol so MM Drivers are informed that
platform code will invoke 3rd part code.
@param DispatchHandle The unique handle assigned to this handler by MmiHandlerRegister().
@param Context Points to an optional handler context which was specified when the handler was registered.
@param CommBuffer A pointer to a collection of data in memory that will
be conveyed from a non-MM environment into an MM environment.
@param CommBufferSize The size of the CommBuffer.
@return Status Code
**/
EFI_STATUS
EFIAPI
MmEndOfDxeHandler (
IN EFI_HANDLE DispatchHandle,
IN CONST VOID *Context OPTIONAL,
IN OUT VOID *CommBuffer OPTIONAL,
IN OUT UINTN *CommBufferSize OPTIONAL
)
{
EFI_STATUS Status;
EFI_HANDLE MmHandle;
DEBUG ((DEBUG_INFO, "MmEndOfDxeHandler\n"));
//
// Install MM EndOfDxe protocol
//
MmHandle = NULL;
Status = MmInstallProtocolInterface (
&MmHandle,
&gEfiMmEndOfDxeProtocolGuid,
EFI_NATIVE_INTERFACE,
NULL
);
return Status;
}
/**
The main entry point to MM Foundation.
Note: This function is only used by MMRAM invocation. It is never used by DXE invocation.
@param MmEntryContext Processor information and functionality
needed by MM Foundation.
**/
VOID
EFIAPI
MmEntryPoint (
IN CONST EFI_MM_ENTRY_CONTEXT *MmEntryContext
)
{
EFI_STATUS Status;
EFI_MM_COMMUNICATE_HEADER *CommunicateHeader;
DEBUG ((DEBUG_INFO, "MmEntryPoint ...\n"));
//
// Update MMST using the context
//
CopyMem (&gMmCoreMmst.MmStartupThisAp, MmEntryContext, sizeof (EFI_MM_ENTRY_CONTEXT));
//
// Call platform hook before Mm Dispatch
//
// PlatformHookBeforeMmDispatch ();
//
// If a legacy boot has occurred, then make sure gMmCorePrivate is not accessed
//
//
// TBD: Mark the InMm flag as TRUE
//
gMmCorePrivate->InMm = TRUE;
//
// Check to see if this is a Synchronous MMI sent through the MM Communication
// Protocol or an Asynchronous MMI
//
if (gMmCorePrivate->CommunicationBuffer != 0) {
//
// Synchronous MMI for MM Core or request from Communicate protocol
//
if (!MmIsBufferOutsideMmValid ((UINTN)gMmCorePrivate->CommunicationBuffer, gMmCorePrivate->BufferSize)) {
//
// If CommunicationBuffer is not in valid address scope, return EFI_INVALID_PARAMETER
//
gMmCorePrivate->CommunicationBuffer = 0;
gMmCorePrivate->ReturnStatus = EFI_INVALID_PARAMETER;
} else {
CommunicateHeader = (EFI_MM_COMMUNICATE_HEADER *)(UINTN)gMmCorePrivate->CommunicationBuffer;
gMmCorePrivate->BufferSize -= OFFSET_OF (EFI_MM_COMMUNICATE_HEADER, Data);
Status = MmiManage (
&CommunicateHeader->HeaderGuid,
NULL,
CommunicateHeader->Data,
(UINTN *)&gMmCorePrivate->BufferSize
);
//
// Update CommunicationBuffer, BufferSize and ReturnStatus
// Communicate service finished, reset the pointer to CommBuffer to NULL
//
gMmCorePrivate->BufferSize += OFFSET_OF (EFI_MM_COMMUNICATE_HEADER, Data);
gMmCorePrivate->CommunicationBuffer = 0;
gMmCorePrivate->ReturnStatus = (Status == EFI_SUCCESS) ? EFI_SUCCESS : EFI_NOT_FOUND;
}
}
//
// Process Asynchronous MMI sources
//
MmiManage (NULL, NULL, NULL, NULL);
//
// TBD: Do not use private data structure ?
//
//
// Clear the InMm flag as we are going to leave MM
//
gMmCorePrivate->InMm = FALSE;
DEBUG ((DEBUG_INFO, "MmEntryPoint Done\n"));
}
/** Register the MM Entry Point provided by the MM Core with the
MM Configuration protocol.
@param [in] Protocol Pointer to the protocol.
@param [in] Interface Pointer to the MM Configuration protocol.
@param [in] Handle Handle.
@retval EFI_SUCCESS Success.
**/
EFI_STATUS
EFIAPI
MmConfigurationMmNotify (
IN CONST EFI_GUID *Protocol,
IN VOID *Interface,
IN EFI_HANDLE Handle
)
{
EFI_STATUS Status;
EFI_MM_CONFIGURATION_PROTOCOL *MmConfiguration;
DEBUG ((DEBUG_INFO, "MmConfigurationMmNotify(%g) - %x\n", Protocol, Interface));
MmConfiguration = Interface;
//
// Register the MM Entry Point provided by the MM Core with the MM COnfiguration protocol
//
Status = MmConfiguration->RegisterMmEntry (MmConfiguration, (EFI_MM_ENTRY_POINT)(UINTN)gMmCorePrivate->MmEntryPoint);
ASSERT_EFI_ERROR (Status);
//
// Set flag to indicate that the MM Entry Point has been registered which
// means that MMIs are now fully operational.
//
gMmCorePrivate->MmEntryPointRegistered = TRUE;
//
// Print debug message showing MM Core entry point address.
//
DEBUG ((DEBUG_INFO, "MM Core registered MM Entry Point address %p\n", (VOID *)(UINTN)gMmCorePrivate->MmEntryPoint));
return EFI_SUCCESS;
}
/** Returns the HOB list size.
@param [in] HobStart Pointer to the start of the HOB list.
@retval Size of the HOB list.
**/
UINTN
GetHobListSize (
IN VOID *HobStart
)
{
EFI_PEI_HOB_POINTERS Hob;
ASSERT (HobStart != NULL);
Hob.Raw = (UINT8 *)HobStart;
while (!END_OF_HOB_LIST (Hob)) {
Hob.Raw = GET_NEXT_HOB (Hob);
}
//
// Need plus END_OF_HOB_LIST
//
return (UINTN)Hob.Raw - (UINTN)HobStart + sizeof (EFI_HOB_GENERIC_HEADER);
}
/**
The Entry Point for MM Core
Install DXE Protocols and reload MM Core into MMRAM and register MM Core
EntryPoint on the MMI vector.
Note: This function is called for both DXE invocation and MMRAM invocation.
@param HobStart Pointer to the start of the HOB list.
@retval EFI_SUCCESS Success.
@retval EFI_UNSUPPORTED Unsupported operation.
**/
EFI_STATUS
EFIAPI
StandaloneMmMain (
IN VOID *HobStart
)
{
EFI_STATUS Status;
UINTN Index;
VOID *MmHobStart;
UINTN HobSize;
VOID *Registration;
EFI_HOB_GUID_TYPE *GuidHob;
MM_CORE_DATA_HOB_DATA *DataInHob;
EFI_HOB_GUID_TYPE *MmramRangesHob;
EFI_MMRAM_HOB_DESCRIPTOR_BLOCK *MmramRangesHobData;
EFI_MMRAM_DESCRIPTOR *MmramRanges;
UINTN MmramRangeCount;
EFI_HOB_FIRMWARE_VOLUME *BfvHob;
ProcessLibraryConstructorList (HobStart, &gMmCoreMmst);
DEBUG ((DEBUG_INFO, "MmMain - 0x%x\n", HobStart));
//
// Determine if the caller has passed a reference to a MM_CORE_PRIVATE_DATA
// structure in the Hoblist. This choice will govern how boot information is
// extracted later.
//
GuidHob = GetNextGuidHob (&gMmCoreDataHobGuid, HobStart);
if (GuidHob == NULL) {
//
// Allocate and zero memory for a MM_CORE_PRIVATE_DATA table and then
// initialise it
//
gMmCorePrivate = (MM_CORE_PRIVATE_DATA *)AllocateRuntimePages (EFI_SIZE_TO_PAGES (sizeof (MM_CORE_PRIVATE_DATA)));
SetMem ((VOID *)(UINTN)gMmCorePrivate, sizeof (MM_CORE_PRIVATE_DATA), 0);
gMmCorePrivate->Signature = MM_CORE_PRIVATE_DATA_SIGNATURE;
gMmCorePrivate->MmEntryPointRegistered = FALSE;
gMmCorePrivate->InMm = FALSE;
gMmCorePrivate->ReturnStatus = EFI_SUCCESS;
//
// Extract the MMRAM ranges from the MMRAM descriptor HOB
//
MmramRangesHob = GetNextGuidHob (&gEfiMmPeiMmramMemoryReserveGuid, HobStart);
if (MmramRangesHob == NULL) {
return EFI_UNSUPPORTED;
}
MmramRangesHobData = GET_GUID_HOB_DATA (MmramRangesHob);
ASSERT (MmramRangesHobData != NULL);
MmramRanges = MmramRangesHobData->Descriptor;
MmramRangeCount = (UINTN)MmramRangesHobData->NumberOfMmReservedRegions;
ASSERT (MmramRanges);
ASSERT (MmramRangeCount);
//
// Copy the MMRAM ranges into MM_CORE_PRIVATE_DATA table just in case any
// code relies on them being present there
//
gMmCorePrivate->MmramRangeCount = (UINT64)MmramRangeCount;
gMmCorePrivate->MmramRanges =
(EFI_PHYSICAL_ADDRESS)(UINTN)AllocatePool (MmramRangeCount * sizeof (EFI_MMRAM_DESCRIPTOR));
ASSERT (gMmCorePrivate->MmramRanges != 0);
CopyMem (
(VOID *)(UINTN)gMmCorePrivate->MmramRanges,
MmramRanges,
MmramRangeCount * sizeof (EFI_MMRAM_DESCRIPTOR)
);
} else {
DataInHob = GET_GUID_HOB_DATA (GuidHob);
gMmCorePrivate = (MM_CORE_PRIVATE_DATA *)(UINTN)DataInHob->Address;
MmramRanges = (EFI_MMRAM_DESCRIPTOR *)(UINTN)gMmCorePrivate->MmramRanges;
MmramRangeCount = (UINTN)gMmCorePrivate->MmramRangeCount;
}
//
// Print the MMRAM ranges passed by the caller
//
DEBUG ((DEBUG_INFO, "MmramRangeCount - 0x%x\n", MmramRangeCount));
for (Index = 0; Index < MmramRangeCount; Index++) {
DEBUG ((
DEBUG_INFO,
"MmramRanges[%d]: 0x%016lx - 0x%lx\n",
Index,
MmramRanges[Index].CpuStart,
MmramRanges[Index].PhysicalSize
));
}
//
// Copy the MMRAM ranges into private MMRAM
//
mMmramRangeCount = MmramRangeCount;
DEBUG ((DEBUG_INFO, "mMmramRangeCount - 0x%x\n", mMmramRangeCount));
mMmramRanges = AllocatePool (mMmramRangeCount * sizeof (EFI_MMRAM_DESCRIPTOR));
DEBUG ((DEBUG_INFO, "mMmramRanges - 0x%x\n", mMmramRanges));
ASSERT (mMmramRanges != NULL);
CopyMem (mMmramRanges, (VOID *)(UINTN)MmramRanges, mMmramRangeCount * sizeof (EFI_MMRAM_DESCRIPTOR));
//
// Get Boot Firmware Volume address from the BFV Hob
//
BfvHob = GetFirstHob (EFI_HOB_TYPE_FV);
if (BfvHob != NULL) {
DEBUG ((DEBUG_INFO, "BFV address - 0x%x\n", BfvHob->BaseAddress));
DEBUG ((DEBUG_INFO, "BFV size - 0x%x\n", BfvHob->Length));
gMmCorePrivate->StandaloneBfvAddress = BfvHob->BaseAddress;
}
gMmCorePrivate->Mmst = (EFI_PHYSICAL_ADDRESS)(UINTN)&gMmCoreMmst;
gMmCorePrivate->MmEntryPoint = (EFI_PHYSICAL_ADDRESS)(UINTN)MmEntryPoint;
//
// No need to initialize memory service.
// It is done in the constructor of StandaloneMmCoreMemoryAllocationLib(),
// so that the library linked with StandaloneMmCore can use AllocatePool() in
// the constructor.
DEBUG ((DEBUG_INFO, "MmInstallConfigurationTable For HobList\n"));
//
// Install HobList
//
HobSize = GetHobListSize (HobStart);
DEBUG ((DEBUG_INFO, "HobSize - 0x%x\n", HobSize));
MmHobStart = AllocatePool (HobSize);
DEBUG ((DEBUG_INFO, "MmHobStart - 0x%x\n", MmHobStart));
ASSERT (MmHobStart != NULL);
CopyMem (MmHobStart, HobStart, HobSize);
Status = MmInstallConfigurationTable (&gMmCoreMmst, &gEfiHobListGuid, MmHobStart, HobSize);
ASSERT_EFI_ERROR (Status);
//
// Register notification for EFI_MM_CONFIGURATION_PROTOCOL registration and
// use it to register the MM Foundation entrypoint
//
DEBUG ((DEBUG_INFO, "MmRegisterProtocolNotify - MmConfigurationMmProtocol\n"));
Status = MmRegisterProtocolNotify (
&gEfiMmConfigurationProtocolGuid,
MmConfigurationMmNotify,
&Registration
);
ASSERT_EFI_ERROR (Status);
//
// Dispatch standalone BFV
//
DEBUG ((DEBUG_INFO, "Mm Dispatch StandaloneBfvAddress - 0x%08x\n", gMmCorePrivate->StandaloneBfvAddress));
if (gMmCorePrivate->StandaloneBfvAddress != 0) {
MmCoreFfsFindMmDriver ((EFI_FIRMWARE_VOLUME_HEADER *)(UINTN)gMmCorePrivate->StandaloneBfvAddress, 0);
MmDispatcher ();
}
//
// Register all handlers in the core table
//
for (Index = 0; mMmCoreMmiHandlers[Index].HandlerType != NULL; Index++) {
Status = MmiHandlerRegister (
mMmCoreMmiHandlers[Index].Handler,
mMmCoreMmiHandlers[Index].HandlerType,
&mMmCoreMmiHandlers[Index].DispatchHandle
);
DEBUG ((DEBUG_INFO, "MmiHandlerRegister - GUID %g - Status %d\n", mMmCoreMmiHandlers[Index].HandlerType, Status));
}
DEBUG ((DEBUG_INFO, "MmMain Done!\n"));
return EFI_SUCCESS;
}
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