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/** @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;
}
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