/** @file Copyright (c) 2014, Intel Corporation. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent **/ #include #include #include #include #include /** This interface conveys state information out of the Security (SEC) phase into PEI. @param PeiServices Pointer to the PEI Services Table. @param StructureSize Pointer to the variable describing size of the input buffer. @param PlatformInformationRecord Pointer to the EFI_SEC_PLATFORM_INFORMATION_RECORD. @retval EFI_SUCCESS The data was successfully returned. @retval EFI_BUFFER_TOO_SMALL The buffer was too small. **/ EFI_STATUS EFIAPI SecPlatformInformation ( IN CONST EFI_PEI_SERVICES **PeiServices, IN OUT UINT64 *StructureSize, OUT EFI_SEC_PLATFORM_INFORMATION_RECORD *PlatformInformationRecord ) { UINT32 *Bist; UINT32 Size; UINT32 Count; UINT32 TopOfTemporaryRam; VOID *TopOfTemporaryRamPpi; EFI_STATUS Status; DEBUG ((DEBUG_INFO, "SecPlatformInformation\n")); Status = (*PeiServices)->LocatePpi ( PeiServices, &gTopOfTemporaryRamPpiGuid, 0, NULL, (VOID **) &TopOfTemporaryRamPpi ); if (EFI_ERROR (Status)) { return EFI_NOT_FOUND; } // // The entries of BIST information, together with the number of them, // reside in the bottom of stack, left untouched by normal stack operation. // This routine copies the BIST information to the buffer pointed by // PlatformInformationRecord for output. // TopOfTemporaryRam = (UINT32)(UINTN)TopOfTemporaryRamPpi - sizeof (UINT32); TopOfTemporaryRam -= sizeof(UINT32) * 2; Count = *((UINT32 *)(UINTN) (TopOfTemporaryRam - sizeof (UINT32))); Size = Count * sizeof (IA32_HANDOFF_STATUS); if ((*StructureSize) < (UINT64) Size) { *StructureSize = Size; return EFI_BUFFER_TOO_SMALL; } *StructureSize = Size; Bist = (UINT32 *) (TopOfTemporaryRam - sizeof (UINT32) - Size); CopyMem (PlatformInformationRecord, Bist, Size); return EFI_SUCCESS; }