/** @file
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This is the driver that locates the MemoryConfigurationData HOB, if it
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exists, and saves the data to nvRAM.
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Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Base.h>
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#include <Uefi.h>
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#include <Library/UefiBootServicesTableLib.h>
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#include <Library/UefiRuntimeServicesTableLib.h>
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#include <Library/HobLib.h>
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#include <Library/DebugLib.h>
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#include <Guid/GlobalVariable.h>
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#include <Library/MemoryAllocationLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Protocol/VariableLock.h>
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/**
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This is the standard EFI driver point that detects whether there is a
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MemoryConfigurationData HOB and, if so, saves its data to nvRAM.
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@param[in] ImageHandle Handle for the image of this driver
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@param[in] SystemTable Pointer to the EFI System Table
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@retval EFI_UNSUPPORTED
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**/
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EFI_STATUS
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EFIAPI
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SaveMemoryConfigEntryPoint (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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{
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EFI_STATUS Status;
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EFI_HOB_GUID_TYPE *GuidHob;
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VOID *HobData;
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VOID *VariableData;
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UINTN DataSize;
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UINTN BufferSize;
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EDKII_VARIABLE_LOCK_PROTOCOL *VariableLock;
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DataSize = 0;
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VariableData = NULL;
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GuidHob = NULL;
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HobData = NULL;
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//
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// Search for the Memory Configuration GUID HOB. If it is not present, then
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// there's nothing we can do. It may not exist on the update path.
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//
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GuidHob = GetFirstGuidHob (&gFspNonVolatileStorageHobGuid);
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if (GuidHob != NULL) {
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HobData = GET_GUID_HOB_DATA (GuidHob);
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DataSize = GET_GUID_HOB_DATA_SIZE(GuidHob);
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if (DataSize > 0) {
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//
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// Use the HOB to save Memory Configuration Data
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//
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BufferSize = DataSize;
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VariableData = AllocatePool (BufferSize);
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if (VariableData == NULL) {
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return EFI_UNSUPPORTED;
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}
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Status = gRT->GetVariable (
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L"MemoryConfig",
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&gFspNonVolatileStorageHobGuid,
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NULL,
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&BufferSize,
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VariableData
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);
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if (Status == EFI_BUFFER_TOO_SMALL) {
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FreePool (VariableData);
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VariableData = AllocatePool (BufferSize);
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if (VariableData == NULL) {
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return EFI_UNSUPPORTED;
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}
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Status = gRT->GetVariable (
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L"MemoryConfig",
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&gFspNonVolatileStorageHobGuid,
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NULL,
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&BufferSize,
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VariableData
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);
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}
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if ( (EFI_ERROR(Status)) || BufferSize != DataSize || 0 != CompareMem (HobData, VariableData, DataSize)) {
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Status = gRT->SetVariable (
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L"MemoryConfig",
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&gFspNonVolatileStorageHobGuid,
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(EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS),
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DataSize,
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HobData
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);
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ASSERT_EFI_ERROR (Status);
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DEBUG((DEBUG_INFO, "Restored Size is 0x%x\n", DataSize));
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}
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//
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// Mark MemoryConfig to read-only if the Variable Lock protocol exists
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//
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Status = gBS->LocateProtocol(&gEdkiiVariableLockProtocolGuid, NULL, (VOID **)&VariableLock);
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if (!EFI_ERROR(Status)) {
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Status = VariableLock->RequestToLock(VariableLock, L"MemoryConfig", &gFspNonVolatileStorageHobGuid);
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ASSERT_EFI_ERROR(Status);
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}
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FreePool (VariableData);
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} else {
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DEBUG((DEBUG_INFO, "Memory save size is %d\n", DataSize));
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}
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} else {
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DEBUG((DEBUG_ERROR, "Memory S3 Data HOB was not found\n"));
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}
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//
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// This driver does not produce any protocol services, so always unload it.
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//
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return EFI_REQUEST_UNLOAD_IMAGE;
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}
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