/** @file
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@copyright
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Copyright 1999 - 2021 Intel Corporation. <BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include "S3NvramSave.h"
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#include <Library/MemoryAllocationLib.h>
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#include <Library/LargeVariableReadLib.h>
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#include <Library/LargeVariableWriteLib.h>
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/**
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Verify the SysHost structure size.
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Verifies that the size of the SysHost structure in PEI is
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the same as the size of the SysHost structure and DXE and
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ASSERT's is the size is not the same.
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This is typically caused by the use of pointers or UINTNs
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in the SysHost structure, neither of those datatypes are
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allowed in SysHost.
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@param None
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@retval None
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**/
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VOID
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VerifySysHostStructureSize (
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VOID
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)
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{
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if (PcdGet32 (PcdPeiSyshostMemorySize) != sizeof (SYSHOST)) {
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DEBUG ((EFI_D_ERROR, "ERROR: In DXE sizeof SysHost = %d, in PEI sizeof SysHost = %d\n",
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sizeof (SYSHOST),
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PcdGet32 (PcdPeiSyshostMemorySize)
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));
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DEBUG ((EFI_D_ERROR, "Size of SysHost must match in PEI and DXE\n"));
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ASSERT (FALSE);
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}
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return;
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} // VerifySysHostStructureSize
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/**
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Saves the FSP Non-Volatile Storage HOB to the UEFI Variable Services
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@param None
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@retval EFI_SUCCESS The FSP Non-Volatile Storage HOB was successfully saved.
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@retval EFI_ERROR The FSP Non-Volatile Storage HOB was not successfully saved.
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**/
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EFI_STATUS
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SaveFspNonVolatileStorageHob (
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VOID
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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 FspNvsBufferSize;
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BOOLEAN DataIsIdentical;
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FspNvsBufferSize = 0;
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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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DataIsIdentical = FALSE;
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Status = EFI_SUCCESS;
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DEBUG ((DEBUG_INFO, "Saving FSP / MRC Training Data\n"));
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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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// Check if the presently saved data is identical to the data given by MRC/FSP
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//
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Status = GetLargeVariable (L"FspNvsBuffer", &gFspNonVolatileStorageHobGuid, &FspNvsBufferSize, NULL);
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if (Status == EFI_BUFFER_TOO_SMALL) {
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if (FspNvsBufferSize == DataSize) {
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VariableData = AllocatePool (FspNvsBufferSize);
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if (VariableData != NULL) {
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Status = GetLargeVariable (L"FspNvsBuffer", &gFspNonVolatileStorageHobGuid, &FspNvsBufferSize, VariableData);
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if (!EFI_ERROR (Status) && (FspNvsBufferSize == DataSize) && (0 == CompareMem (HobData, VariableData, DataSize))) {
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DataIsIdentical = TRUE;
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}
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FreePool (VariableData);
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}
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}
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}
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Status = EFI_SUCCESS;
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if (!DataIsIdentical) {
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Status = SetLargeVariable (L"FspNvsBuffer", &gFspNonVolatileStorageHobGuid, TRUE, DataSize, HobData);
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ASSERT_EFI_ERROR (Status);
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DEBUG ((DEBUG_INFO, "Saved size of FSP / MRC Training Data: 0x%x\n", DataSize));
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} else {
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DEBUG ((DEBUG_INFO, "FSP / MRC Training Data is identical to data from last boot, no need to save.\n"));
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}
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}
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}
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return Status;
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}
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EFI_STATUS
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EFIAPI
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S3NvramSaveEntry (
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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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This is the main entry point of the S3 NVRAM Save module.
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@param ImageHandle - Handle for the image of this driver.
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@param SystemTable - Pointer to the EFI System Table.
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@retval EFI_SUCCESS - Module launched successfully.
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**/
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{
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EFI_STATUS Status = EFI_SUCCESS;
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//
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// Check that SysHost size in DXE is the same as PEI.
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//
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#ifndef FSP_API_MODE
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VerifySysHostStructureSize ();
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#endif
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//
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// Save structures into NVRAM if needed
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//
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Status = SaveFspNonVolatileStorageHob ();
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if (EFI_ERROR (Status)) {
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DEBUG ((DEBUG_ERROR, "Error: FSP NVRAM Data NOT Saved! Status: %r\n", Status));
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Status = EFI_SUCCESS;
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}
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return Status;
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}
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