From af1a266670d040d2f4083ff309d732d648afba2a Mon Sep 17 00:00:00 2001 From: Angelos Mouzakitis Date: Tue, 10 Oct 2023 14:33:42 +0000 Subject: Add submodule dependency files Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec --- roms/edk2/MdePkg/Library/SmmMemLib/SmmMemLib.c | 652 +++++++++++++++++++++++++ 1 file changed, 652 insertions(+) create mode 100644 roms/edk2/MdePkg/Library/SmmMemLib/SmmMemLib.c (limited to 'roms/edk2/MdePkg/Library/SmmMemLib/SmmMemLib.c') diff --git a/roms/edk2/MdePkg/Library/SmmMemLib/SmmMemLib.c b/roms/edk2/MdePkg/Library/SmmMemLib/SmmMemLib.c new file mode 100644 index 000000000..63a4ff7a9 --- /dev/null +++ b/roms/edk2/MdePkg/Library/SmmMemLib/SmmMemLib.c @@ -0,0 +1,652 @@ +/** @file + Instance of SMM memory check library. + + SMM memory check library library implementation. This library consumes SMM_ACCESS2_PROTOCOL + to get SMRAM information. In order to use this library instance, the platform should produce + all SMRAM range via SMM_ACCESS2_PROTOCOL, including the range for firmware (like SMM Core + and SMM driver) and/or specific dedicated hardware. + + Copyright (c) 2015 - 2018, Intel Corporation. All rights reserved.
+ SPDX-License-Identifier: BSD-2-Clause-Patent + +**/ + + +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +// +// attributes for reserved memory before it is promoted to system memory +// +#define EFI_MEMORY_PRESENT 0x0100000000000000ULL +#define EFI_MEMORY_INITIALIZED 0x0200000000000000ULL +#define EFI_MEMORY_TESTED 0x0400000000000000ULL + +EFI_SMRAM_DESCRIPTOR *mSmmMemLibInternalSmramRanges; +UINTN mSmmMemLibInternalSmramCount; + +// +// Maximum support address used to check input buffer +// +EFI_PHYSICAL_ADDRESS mSmmMemLibInternalMaximumSupportAddress = 0; + +UINTN mMemoryMapEntryCount; +EFI_MEMORY_DESCRIPTOR *mMemoryMap; +UINTN mDescriptorSize; + +EFI_GCD_MEMORY_SPACE_DESCRIPTOR *mSmmMemLibGcdMemSpace = NULL; +UINTN mSmmMemLibGcdMemNumberOfDesc = 0; + +EFI_MEMORY_ATTRIBUTES_TABLE *mSmmMemLibMemoryAttributesTable = NULL; + +VOID *mRegistrationEndOfDxe; +VOID *mRegistrationReadyToLock; + +BOOLEAN mSmmMemLibSmmReadyToLock = FALSE; + +/** + Calculate and save the maximum support address. + +**/ +VOID +SmmMemLibInternalCalculateMaximumSupportAddress ( + VOID + ) +{ + VOID *Hob; + UINT32 RegEax; + UINT8 PhysicalAddressBits; + + // + // Get physical address bits supported. + // + Hob = GetFirstHob (EFI_HOB_TYPE_CPU); + if (Hob != NULL) { + PhysicalAddressBits = ((EFI_HOB_CPU *) Hob)->SizeOfMemorySpace; + } else { + AsmCpuid (0x80000000, &RegEax, NULL, NULL, NULL); + if (RegEax >= 0x80000008) { + AsmCpuid (0x80000008, &RegEax, NULL, NULL, NULL); + PhysicalAddressBits = (UINT8) RegEax; + } else { + PhysicalAddressBits = 36; + } + } + // + // IA-32e paging translates 48-bit linear addresses to 52-bit physical addresses. + // + ASSERT (PhysicalAddressBits <= 52); + if (PhysicalAddressBits > 48) { + PhysicalAddressBits = 48; + } + + // + // Save the maximum support address in one global variable + // + mSmmMemLibInternalMaximumSupportAddress = (EFI_PHYSICAL_ADDRESS)(UINTN)(LShiftU64 (1, PhysicalAddressBits) - 1); + DEBUG ((EFI_D_INFO, "mSmmMemLibInternalMaximumSupportAddress = 0x%lx\n", mSmmMemLibInternalMaximumSupportAddress)); +} + +/** + This function check if the buffer is valid per processor architecture and not overlap with SMRAM. + + @param Buffer The buffer start address to be checked. + @param Length The buffer length to be checked. + + @retval TRUE This buffer is valid per processor architecture and not overlap with SMRAM. + @retval FALSE This buffer is not valid per processor architecture or overlap with SMRAM. +**/ +BOOLEAN +EFIAPI +SmmIsBufferOutsideSmmValid ( + IN EFI_PHYSICAL_ADDRESS Buffer, + IN UINT64 Length + ) +{ + UINTN Index; + + // + // Check override. + // NOTE: (B:0->L:4G) is invalid for IA32, but (B:1->L:4G-1)/(B:4G-1->L:1) is valid. + // + if ((Length > mSmmMemLibInternalMaximumSupportAddress) || + (Buffer > mSmmMemLibInternalMaximumSupportAddress) || + ((Length != 0) && (Buffer > (mSmmMemLibInternalMaximumSupportAddress - (Length - 1)))) ) { + // + // Overflow happen + // + DEBUG (( + EFI_D_ERROR, + "SmmIsBufferOutsideSmmValid: Overflow: Buffer (0x%lx) - Length (0x%lx), MaximumSupportAddress (0x%lx)\n", + Buffer, + Length, + mSmmMemLibInternalMaximumSupportAddress + )); + return FALSE; + } + + for (Index = 0; Index < mSmmMemLibInternalSmramCount; Index ++) { + if (((Buffer >= mSmmMemLibInternalSmramRanges[Index].CpuStart) && (Buffer < mSmmMemLibInternalSmramRanges[Index].CpuStart + mSmmMemLibInternalSmramRanges[Index].PhysicalSize)) || + ((mSmmMemLibInternalSmramRanges[Index].CpuStart >= Buffer) && (mSmmMemLibInternalSmramRanges[Index].CpuStart < Buffer + Length))) { + DEBUG (( + EFI_D_ERROR, + "SmmIsBufferOutsideSmmValid: Overlap: Buffer (0x%lx) - Length (0x%lx), ", + Buffer, + Length + )); + DEBUG (( + EFI_D_ERROR, + "CpuStart (0x%lx) - PhysicalSize (0x%lx)\n", + mSmmMemLibInternalSmramRanges[Index].CpuStart, + mSmmMemLibInternalSmramRanges[Index].PhysicalSize + )); + return FALSE; + } + } + + // + // Check override for Valid Communication Region + // + if (mSmmMemLibSmmReadyToLock) { + EFI_MEMORY_DESCRIPTOR *MemoryMap; + BOOLEAN InValidCommunicationRegion; + + InValidCommunicationRegion = FALSE; + MemoryMap = mMemoryMap; + for (Index = 0; Index < mMemoryMapEntryCount; Index++) { + if ((Buffer >= MemoryMap->PhysicalStart) && + (Buffer + Length <= MemoryMap->PhysicalStart + LShiftU64 (MemoryMap->NumberOfPages, EFI_PAGE_SHIFT))) { + InValidCommunicationRegion = TRUE; + } + MemoryMap = NEXT_MEMORY_DESCRIPTOR(MemoryMap, mDescriptorSize); + } + + if (!InValidCommunicationRegion) { + DEBUG (( + EFI_D_ERROR, + "SmmIsBufferOutsideSmmValid: Not in ValidCommunicationRegion: Buffer (0x%lx) - Length (0x%lx)\n", + Buffer, + Length + )); + return FALSE; + } + + // + // Check untested memory as invalid communication buffer. + // + for (Index = 0; Index < mSmmMemLibGcdMemNumberOfDesc; Index++) { + if (((Buffer >= mSmmMemLibGcdMemSpace[Index].BaseAddress) && (Buffer < mSmmMemLibGcdMemSpace[Index].BaseAddress + mSmmMemLibGcdMemSpace[Index].Length)) || + ((mSmmMemLibGcdMemSpace[Index].BaseAddress >= Buffer) && (mSmmMemLibGcdMemSpace[Index].BaseAddress < Buffer + Length))) { + DEBUG (( + EFI_D_ERROR, + "SmmIsBufferOutsideSmmValid: In Untested Memory Region: Buffer (0x%lx) - Length (0x%lx)\n", + Buffer, + Length + )); + return FALSE; + } + } + + // + // Check UEFI runtime memory with EFI_MEMORY_RO as invalid communication buffer. + // + if (mSmmMemLibMemoryAttributesTable != NULL) { + EFI_MEMORY_DESCRIPTOR *Entry; + + Entry = (EFI_MEMORY_DESCRIPTOR *)(mSmmMemLibMemoryAttributesTable + 1); + for (Index = 0; Index < mSmmMemLibMemoryAttributesTable->NumberOfEntries; Index++) { + if (Entry->Type == EfiRuntimeServicesCode || Entry->Type == EfiRuntimeServicesData) { + if ((Entry->Attribute & EFI_MEMORY_RO) != 0) { + if (((Buffer >= Entry->PhysicalStart) && (Buffer < Entry->PhysicalStart + LShiftU64 (Entry->NumberOfPages, EFI_PAGE_SHIFT))) || + ((Entry->PhysicalStart >= Buffer) && (Entry->PhysicalStart < Buffer + Length))) { + DEBUG (( + EFI_D_ERROR, + "SmmIsBufferOutsideSmmValid: In RuntimeCode Region: Buffer (0x%lx) - Length (0x%lx)\n", + Buffer, + Length + )); + return FALSE; + } + } + } + Entry = NEXT_MEMORY_DESCRIPTOR (Entry, mSmmMemLibMemoryAttributesTable->DescriptorSize); + } + } + } + return TRUE; +} + +/** + Copies a source buffer (non-SMRAM) to a destination buffer (SMRAM). + + This function copies a source buffer (non-SMRAM) to a destination buffer (SMRAM). + It checks if source buffer is valid per processor architecture and not overlap with SMRAM. + If the check passes, it copies memory and returns EFI_SUCCESS. + If the check fails, it return EFI_SECURITY_VIOLATION. + The implementation must be reentrant. + + @param DestinationBuffer The pointer to the destination buffer of the memory copy. + @param SourceBuffer The pointer to the source buffer of the memory copy. + @param Length The number of bytes to copy from SourceBuffer to DestinationBuffer. + + @retval EFI_SECURITY_VIOLATION The SourceBuffer is invalid per processor architecture or overlap with SMRAM. + @retval EFI_SUCCESS Memory is copied. + +**/ +EFI_STATUS +EFIAPI +SmmCopyMemToSmram ( + OUT VOID *DestinationBuffer, + IN CONST VOID *SourceBuffer, + IN UINTN Length + ) +{ + if (!SmmIsBufferOutsideSmmValid ((EFI_PHYSICAL_ADDRESS)(UINTN)SourceBuffer, Length)) { + DEBUG ((EFI_D_ERROR, "SmmCopyMemToSmram: Security Violation: Source (0x%x), Length (0x%x)\n", SourceBuffer, Length)); + return EFI_SECURITY_VIOLATION; + } + CopyMem (DestinationBuffer, SourceBuffer, Length); + return EFI_SUCCESS; +} + +/** + Copies a source buffer (SMRAM) to a destination buffer (NON-SMRAM). + + This function copies a source buffer (non-SMRAM) to a destination buffer (SMRAM). + It checks if destination buffer is valid per processor architecture and not overlap with SMRAM. + If the check passes, it copies memory and returns EFI_SUCCESS. + If the check fails, it returns EFI_SECURITY_VIOLATION. + The implementation must be reentrant. + + @param DestinationBuffer The pointer to the destination buffer of the memory copy. + @param SourceBuffer The pointer to the source buffer of the memory copy. + @param Length The number of bytes to copy from SourceBuffer to DestinationBuffer. + + @retval EFI_SECURITY_VIOLATION The DestinationBuffer is invalid per processor architecture or overlap with SMRAM. + @retval EFI_SUCCESS Memory is copied. + +**/ +EFI_STATUS +EFIAPI +SmmCopyMemFromSmram ( + OUT VOID *DestinationBuffer, + IN CONST VOID *SourceBuffer, + IN UINTN Length + ) +{ + if (!SmmIsBufferOutsideSmmValid ((EFI_PHYSICAL_ADDRESS)(UINTN)DestinationBuffer, Length)) { + DEBUG ((EFI_D_ERROR, "SmmCopyMemFromSmram: Security Violation: Destination (0x%x), Length (0x%x)\n", DestinationBuffer, Length)); + return EFI_SECURITY_VIOLATION; + } + CopyMem (DestinationBuffer, SourceBuffer, Length); + return EFI_SUCCESS; +} + +/** + Copies a source buffer (NON-SMRAM) to a destination buffer (NON-SMRAM). + + This function copies a source buffer (non-SMRAM) to a destination buffer (SMRAM). + It checks if source buffer and destination buffer are valid per processor architecture and not overlap with SMRAM. + If the check passes, it copies memory and returns EFI_SUCCESS. + If the check fails, it returns EFI_SECURITY_VIOLATION. + The implementation must be reentrant, and it must handle the case where source buffer overlaps destination buffer. + + @param DestinationBuffer The pointer to the destination buffer of the memory copy. + @param SourceBuffer The pointer to the source buffer of the memory copy. + @param Length The number of bytes to copy from SourceBuffer to DestinationBuffer. + + @retval EFI_SECURITY_VIOLATION The DestinationBuffer is invalid per processor architecture or overlap with SMRAM. + @retval EFI_SECURITY_VIOLATION The SourceBuffer is invalid per processor architecture or overlap with SMRAM. + @retval EFI_SUCCESS Memory is copied. + +**/ +EFI_STATUS +EFIAPI +SmmCopyMem ( + OUT VOID *DestinationBuffer, + IN CONST VOID *SourceBuffer, + IN UINTN Length + ) +{ + if (!SmmIsBufferOutsideSmmValid ((EFI_PHYSICAL_ADDRESS)(UINTN)DestinationBuffer, Length)) { + DEBUG ((EFI_D_ERROR, "SmmCopyMem: Security Violation: Destination (0x%x), Length (0x%x)\n", DestinationBuffer, Length)); + return EFI_SECURITY_VIOLATION; + } + if (!SmmIsBufferOutsideSmmValid ((EFI_PHYSICAL_ADDRESS)(UINTN)SourceBuffer, Length)) { + DEBUG ((EFI_D_ERROR, "SmmCopyMem: Security Violation: Source (0x%x), Length (0x%x)\n", SourceBuffer, Length)); + return EFI_SECURITY_VIOLATION; + } + CopyMem (DestinationBuffer, SourceBuffer, Length); + return EFI_SUCCESS; +} + +/** + Fills a target buffer (NON-SMRAM) with a byte value. + + This function fills a target buffer (non-SMRAM) with a byte value. + It checks if target buffer is valid per processor architecture and not overlap with SMRAM. + If the check passes, it fills memory and returns EFI_SUCCESS. + If the check fails, it returns EFI_SECURITY_VIOLATION. + + @param Buffer The memory to set. + @param Length The number of bytes to set. + @param Value The value with which to fill Length bytes of Buffer. + + @retval EFI_SECURITY_VIOLATION The Buffer is invalid per processor architecture or overlap with SMRAM. + @retval EFI_SUCCESS Memory is set. + +**/ +EFI_STATUS +EFIAPI +SmmSetMem ( + OUT VOID *Buffer, + IN UINTN Length, + IN UINT8 Value + ) +{ + if (!SmmIsBufferOutsideSmmValid ((EFI_PHYSICAL_ADDRESS)(UINTN)Buffer, Length)) { + DEBUG ((EFI_D_ERROR, "SmmSetMem: Security Violation: Source (0x%x), Length (0x%x)\n", Buffer, Length)); + return EFI_SECURITY_VIOLATION; + } + SetMem (Buffer, Length, Value); + return EFI_SUCCESS; +} + +/** + Get GCD memory map. + Only record untested memory as invalid communication buffer. +**/ +VOID +SmmMemLibInternalGetGcdMemoryMap ( + VOID + ) +{ + UINTN NumberOfDescriptors; + EFI_GCD_MEMORY_SPACE_DESCRIPTOR *MemSpaceMap; + EFI_STATUS Status; + UINTN Index; + + Status = gDS->GetMemorySpaceMap (&NumberOfDescriptors, &MemSpaceMap); + if (EFI_ERROR (Status)) { + return ; + } + + mSmmMemLibGcdMemNumberOfDesc = 0; + for (Index = 0; Index < NumberOfDescriptors; Index++) { + if (MemSpaceMap[Index].GcdMemoryType == EfiGcdMemoryTypeReserved && + (MemSpaceMap[Index].Capabilities & (EFI_MEMORY_PRESENT | EFI_MEMORY_INITIALIZED | EFI_MEMORY_TESTED)) == + (EFI_MEMORY_PRESENT | EFI_MEMORY_INITIALIZED) + ) { + mSmmMemLibGcdMemNumberOfDesc++; + } + } + + mSmmMemLibGcdMemSpace = AllocateZeroPool (mSmmMemLibGcdMemNumberOfDesc * sizeof (EFI_GCD_MEMORY_SPACE_DESCRIPTOR)); + ASSERT (mSmmMemLibGcdMemSpace != NULL); + if (mSmmMemLibGcdMemSpace == NULL) { + mSmmMemLibGcdMemNumberOfDesc = 0; + gBS->FreePool (MemSpaceMap); + return ; + } + + mSmmMemLibGcdMemNumberOfDesc = 0; + for (Index = 0; Index < NumberOfDescriptors; Index++) { + if (MemSpaceMap[Index].GcdMemoryType == EfiGcdMemoryTypeReserved && + (MemSpaceMap[Index].Capabilities & (EFI_MEMORY_PRESENT | EFI_MEMORY_INITIALIZED | EFI_MEMORY_TESTED)) == + (EFI_MEMORY_PRESENT | EFI_MEMORY_INITIALIZED) + ) { + CopyMem ( + &mSmmMemLibGcdMemSpace[mSmmMemLibGcdMemNumberOfDesc], + &MemSpaceMap[Index], + sizeof(EFI_GCD_MEMORY_SPACE_DESCRIPTOR) + ); + mSmmMemLibGcdMemNumberOfDesc++; + } + } + + gBS->FreePool (MemSpaceMap); +} + +/** + Get UEFI MemoryAttributesTable. +**/ +VOID +SmmMemLibInternalGetUefiMemoryAttributesTable ( + VOID + ) +{ + EFI_STATUS Status; + EFI_MEMORY_ATTRIBUTES_TABLE *MemoryAttributesTable; + UINTN MemoryAttributesTableSize; + + Status = EfiGetSystemConfigurationTable (&gEfiMemoryAttributesTableGuid, (VOID **)&MemoryAttributesTable); + if (!EFI_ERROR (Status) && (MemoryAttributesTable != NULL)) { + MemoryAttributesTableSize = sizeof(EFI_MEMORY_ATTRIBUTES_TABLE) + MemoryAttributesTable->DescriptorSize * MemoryAttributesTable->NumberOfEntries; + mSmmMemLibMemoryAttributesTable = AllocateCopyPool (MemoryAttributesTableSize, MemoryAttributesTable); + ASSERT (mSmmMemLibMemoryAttributesTable != NULL); + } +} + +/** + Notification for SMM EndOfDxe protocol. + + @param[in] Protocol Points to the protocol's unique identifier. + @param[in] Interface Points to the interface instance. + @param[in] Handle The handle on which the interface was installed. + + @retval EFI_SUCCESS Notification runs successfully. +**/ +EFI_STATUS +EFIAPI +SmmLibInternalEndOfDxeNotify ( + IN CONST EFI_GUID *Protocol, + IN VOID *Interface, + IN EFI_HANDLE Handle + ) +{ + EFI_STATUS Status; + UINTN MapKey; + UINTN MemoryMapSize; + EFI_MEMORY_DESCRIPTOR *MemoryMap; + EFI_MEMORY_DESCRIPTOR *MemoryMapStart; + EFI_MEMORY_DESCRIPTOR *SmmMemoryMapStart; + UINTN MemoryMapEntryCount; + UINTN DescriptorSize; + UINT32 DescriptorVersion; + UINTN Index; + + MemoryMapSize = 0; + MemoryMap = NULL; + Status = gBS->GetMemoryMap ( + &MemoryMapSize, + MemoryMap, + &MapKey, + &DescriptorSize, + &DescriptorVersion + ); + ASSERT (Status == EFI_BUFFER_TOO_SMALL); + + do { + Status = gBS->AllocatePool (EfiBootServicesData, MemoryMapSize, (VOID **)&MemoryMap); + ASSERT (MemoryMap != NULL); + + Status = gBS->GetMemoryMap ( + &MemoryMapSize, + MemoryMap, + &MapKey, + &DescriptorSize, + &DescriptorVersion + ); + if (EFI_ERROR (Status)) { + gBS->FreePool (MemoryMap); + } + } while (Status == EFI_BUFFER_TOO_SMALL); + + // + // Get Count + // + mDescriptorSize = DescriptorSize; + MemoryMapEntryCount = MemoryMapSize/DescriptorSize; + MemoryMapStart = MemoryMap; + mMemoryMapEntryCount = 0; + for (Index = 0; Index < MemoryMapEntryCount; Index++) { + switch (MemoryMap->Type) { + case EfiReservedMemoryType: + case EfiRuntimeServicesCode: + case EfiRuntimeServicesData: + case EfiACPIMemoryNVS: + mMemoryMapEntryCount++; + break; + } + MemoryMap = NEXT_MEMORY_DESCRIPTOR(MemoryMap, DescriptorSize); + } + MemoryMap = MemoryMapStart; + + // + // Get Data + // + mMemoryMap = AllocatePool (mMemoryMapEntryCount*DescriptorSize); + ASSERT (mMemoryMap != NULL); + SmmMemoryMapStart = mMemoryMap; + for (Index = 0; Index < MemoryMapEntryCount; Index++) { + switch (MemoryMap->Type) { + case EfiReservedMemoryType: + case EfiRuntimeServicesCode: + case EfiRuntimeServicesData: + case EfiACPIMemoryNVS: + CopyMem (mMemoryMap, MemoryMap, DescriptorSize); + mMemoryMap = NEXT_MEMORY_DESCRIPTOR(mMemoryMap, DescriptorSize); + break; + } + MemoryMap = NEXT_MEMORY_DESCRIPTOR(MemoryMap, DescriptorSize); + } + mMemoryMap = SmmMemoryMapStart; + MemoryMap = MemoryMapStart; + + gBS->FreePool (MemoryMap); + + // + // Get additional information from GCD memory map. + // + SmmMemLibInternalGetGcdMemoryMap (); + + // + // Get UEFI memory attributes table. + // + SmmMemLibInternalGetUefiMemoryAttributesTable (); + + return EFI_SUCCESS; +} + +/** + Notification for SMM ReadyToLock protocol. + + @param[in] Protocol Points to the protocol's unique identifier. + @param[in] Interface Points to the interface instance. + @param[in] Handle The handle on which the interface was installed. + + @retval EFI_SUCCESS Notification runs successfully. +**/ +EFI_STATUS +EFIAPI +SmmLibInternalReadyToLockNotify ( + IN CONST EFI_GUID *Protocol, + IN VOID *Interface, + IN EFI_HANDLE Handle + ) +{ + mSmmMemLibSmmReadyToLock = TRUE; + return EFI_SUCCESS; +} +/** + The constructor function initializes the Smm Mem library + + @param ImageHandle The firmware allocated handle for the EFI image. + @param SystemTable A pointer to the EFI System Table. + + @retval EFI_SUCCESS The constructor always returns EFI_SUCCESS. + +**/ +EFI_STATUS +EFIAPI +SmmMemLibConstructor ( + IN EFI_HANDLE ImageHandle, + IN EFI_SYSTEM_TABLE *SystemTable + ) +{ + EFI_STATUS Status; + EFI_SMM_ACCESS2_PROTOCOL *SmmAccess; + UINTN Size; + + // + // Get SMRAM information + // + Status = gBS->LocateProtocol (&gEfiSmmAccess2ProtocolGuid, NULL, (VOID **)&SmmAccess); + ASSERT_EFI_ERROR (Status); + + Size = 0; + Status = SmmAccess->GetCapabilities (SmmAccess, &Size, NULL); + ASSERT (Status == EFI_BUFFER_TOO_SMALL); + + mSmmMemLibInternalSmramRanges = AllocatePool (Size); + ASSERT (mSmmMemLibInternalSmramRanges != NULL); + + Status = SmmAccess->GetCapabilities (SmmAccess, &Size, mSmmMemLibInternalSmramRanges); + ASSERT_EFI_ERROR (Status); + + mSmmMemLibInternalSmramCount = Size / sizeof (EFI_SMRAM_DESCRIPTOR); + + // + // Calculate and save maximum support address + // + SmmMemLibInternalCalculateMaximumSupportAddress (); + + // + // Register EndOfDxe to get UEFI memory map + // + Status = gSmst->SmmRegisterProtocolNotify (&gEfiSmmEndOfDxeProtocolGuid, SmmLibInternalEndOfDxeNotify, &mRegistrationEndOfDxe); + ASSERT_EFI_ERROR (Status); + + // + // Register ready to lock so that we can know when to check valid SMRAM region + // + Status = gSmst->SmmRegisterProtocolNotify (&gEfiSmmReadyToLockProtocolGuid, SmmLibInternalReadyToLockNotify, &mRegistrationReadyToLock); + ASSERT_EFI_ERROR (Status); + + return EFI_SUCCESS; +} + +/** + The destructor function frees resource used in the Smm Mem library + + @param[in] ImageHandle The firmware allocated handle for the EFI image. + @param[in] SystemTable A pointer to the EFI System Table. + + @retval EFI_SUCCESS The deconstructor always returns EFI_SUCCESS. +**/ +EFI_STATUS +EFIAPI +SmmMemLibDestructor ( + IN EFI_HANDLE ImageHandle, + IN EFI_SYSTEM_TABLE *SystemTable + ) +{ + FreePool (mSmmMemLibInternalSmramRanges); + + gSmst->SmmRegisterProtocolNotify (&gEfiSmmEndOfDxeProtocolGuid, NULL, &mRegistrationEndOfDxe); + gSmst->SmmRegisterProtocolNotify (&gEfiSmmReadyToLockProtocolGuid, NULL, &mRegistrationReadyToLock); + return EFI_SUCCESS; +} -- cgit 1.2.3-korg