/** @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) 2013-2015 Intel Corporation.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Library/DebugLib.h>
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#include <Library/HobLib.h>
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#include <Library/MemoryAllocationLib.h>
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#include <Library/UefiBootServicesTableLib.h>
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#include <Library/UefiRuntimeServicesTableLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/UefiDriverEntryPoint.h>
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#include <Guid/MemoryConfigData.h>
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#include <Guid/DebugMask.h>
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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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Routine Description:
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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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Arguments:
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ImageHandle - Handle for the image of this driver
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SystemTable - Pointer to the EFI System Table
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Returns:
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EFI_SUCCESS - if the data is successfully saved or there was no data
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EFI_NOT_FOUND - if the HOB list could not be located.
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EFI_UNLOAD_IMAGE - It is not success
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--*/
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{
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EFI_STATUS Status;
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VOID *HobList;
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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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DataSize = 0;
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VariableData = NULL;
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GuidHob = NULL;
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HobList = NULL;
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HobData = NULL;
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Status = EFI_UNSUPPORTED;
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//
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// Get the HOB list. If it is not present, then ASSERT.
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//
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HobList = GetHobList ();
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ASSERT (HobList != 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 = GetNextGuidHob (&gEfiMemoryConfigDataGuid, HobList);
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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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//
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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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ASSERT (VariableData != NULL);
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Status = gRT->GetVariable (
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EFI_MEMORY_CONFIG_DATA_NAME,
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&gEfiMemoryConfigDataGuid,
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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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gBS->FreePool (VariableData);
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VariableData = AllocatePool (BufferSize);
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ASSERT (VariableData != NULL);
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Status = gRT->GetVariable (
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EFI_MEMORY_CONFIG_DATA_NAME,
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&gEfiMemoryConfigDataGuid,
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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 || CompareMem (HobData, VariableData, DataSize) != 0) {
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Status = gRT->SetVariable (
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EFI_MEMORY_CONFIG_DATA_NAME,
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&gEfiMemoryConfigDataGuid,
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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((Status == EFI_SUCCESS) || (Status == EFI_OUT_OF_RESOURCES));
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}
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gBS->FreePool (VariableData);
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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 Status;
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}
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