mirror of https://github.com/acidanthera/audk.git
85 lines
2.9 KiB
C
85 lines
2.9 KiB
C
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/** @file
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Sample to provide SecPlatformInformation function.
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Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php.
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <PiPei.h>
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#include <Ppi/SecPlatformInformation.h>
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#include <Ppi/TopOfTemporaryRam.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/DebugLib.h>
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/**
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This interface conveys state information out of the Security (SEC) phase into PEI.
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@param[in] PeiServices Pointer to the PEI Services Table.
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@param[in,out] StructureSize Pointer to the variable describing size of the input buffer.
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@param[out] PlatformInformationRecord Pointer to the EFI_SEC_PLATFORM_INFORMATION_RECORD.
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@retval EFI_SUCCESS The data was successfully returned.
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@retval EFI_BUFFER_TOO_SMALL The buffer was too small.
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**/
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EFI_STATUS
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EFIAPI
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SecPlatformInformation (
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IN CONST EFI_PEI_SERVICES **PeiServices,
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IN OUT UINT64 *StructureSize,
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OUT EFI_SEC_PLATFORM_INFORMATION_RECORD *PlatformInformationRecord
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)
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{
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UINT32 *Bist;
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UINT32 Size;
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UINT32 Count;
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UINT32 TopOfTemporaryRam;
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VOID *TopOfTemporaryRamPpi;
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EFI_STATUS Status;
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DEBUG ((DEBUG_INFO, "SecPlatformInformation\n"));
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Status = (*PeiServices)->LocatePpi (
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PeiServices,
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&gTopOfTemporaryRamPpiGuid,
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0,
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NULL,
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(VOID **) &TopOfTemporaryRamPpi
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);
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if (EFI_ERROR (Status)) {
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return EFI_NOT_FOUND;
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}
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//
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// The entries of BIST information, together with the number of them,
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// reside in the bottom of stack, left untouched by normal stack operation.
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// This routine copies the BIST information to the buffer pointed by
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// PlatformInformationRecord for output.
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//
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TopOfTemporaryRam = (UINT32)(UINTN)TopOfTemporaryRamPpi - sizeof (UINT32);
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TopOfTemporaryRam -= sizeof(UINT32) * 2;
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Count = *((UINT32 *)(UINTN) (TopOfTemporaryRam - sizeof (UINT32)));
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Size = Count * sizeof (IA32_HANDOFF_STATUS);
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if ((*StructureSize) < (UINT64) Size) {
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*StructureSize = Size;
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return EFI_BUFFER_TOO_SMALL;
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}
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*StructureSize = Size;
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Bist = (UINT32 *) (TopOfTemporaryRam - sizeof (UINT32) - Size);
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CopyMem (PlatformInformationRecord, Bist, Size);
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return EFI_SUCCESS;
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}
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