/** @file | |
Sample to provide SecPlatformInformation function. | |
Copyright (c) 2014, Intel Corporation. All rights reserved.<BR> | |
SPDX-License-Identifier: BSD-2-Clause-Patent | |
**/ | |
#include <PiPei.h> | |
#include <Ppi/SecPlatformInformation.h> | |
#include <Ppi/TopOfTemporaryRam.h> | |
#include <Library/BaseMemoryLib.h> | |
#include <Library/DebugLib.h> | |
/** | |
This interface conveys state information out of the Security (SEC) phase into PEI. | |
@param[in] PeiServices Pointer to the PEI Services Table. | |
@param[in,out] StructureSize Pointer to the variable describing size of the input buffer. | |
@param[out] 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; | |
} |