1 /** @file 2 Sample to provide SecPlatformInformation function. 3 4 Copyright (c) 2014, Intel Corporation. All rights reserved.<BR> 5 This program and the accompanying materials 6 are licensed and made available under the terms and conditions of the BSD License 7 which accompanies this distribution. The full text of the license may be found at 8 http://opensource.org/licenses/bsd-license.php. 9 10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 12 13 **/ 14 15 #include <PiPei.h> 16 17 #include <Ppi/SecPlatformInformation.h> 18 #include <Ppi/TopOfTemporaryRam.h> 19 20 #include <Library/BaseMemoryLib.h> 21 #include <Library/DebugLib.h> 22 23 /** 24 This interface conveys state information out of the Security (SEC) phase into PEI. 25 26 @param[in] PeiServices Pointer to the PEI Services Table. 27 @param[in,out] StructureSize Pointer to the variable describing size of the input buffer. 28 @param[out] PlatformInformationRecord Pointer to the EFI_SEC_PLATFORM_INFORMATION_RECORD. 29 30 @retval EFI_SUCCESS The data was successfully returned. 31 @retval EFI_BUFFER_TOO_SMALL The buffer was too small. 32 33 **/ 34 EFI_STATUS 35 EFIAPI 36 SecPlatformInformation ( 37 IN CONST EFI_PEI_SERVICES **PeiServices, 38 IN OUT UINT64 *StructureSize, 39 OUT EFI_SEC_PLATFORM_INFORMATION_RECORD *PlatformInformationRecord 40 ) 41 { 42 UINT32 *Bist; 43 UINT32 Size; 44 UINT32 Count; 45 UINT32 TopOfTemporaryRam; 46 VOID *TopOfTemporaryRamPpi; 47 EFI_STATUS Status; 48 49 DEBUG ((DEBUG_INFO, "SecPlatformInformation\n")); 50 51 Status = (*PeiServices)->LocatePpi ( 52 PeiServices, 53 &gTopOfTemporaryRamPpiGuid, 54 0, 55 NULL, 56 (VOID **) &TopOfTemporaryRamPpi 57 ); 58 if (EFI_ERROR (Status)) { 59 return EFI_NOT_FOUND; 60 } 61 62 // 63 // The entries of BIST information, together with the number of them, 64 // reside in the bottom of stack, left untouched by normal stack operation. 65 // This routine copies the BIST information to the buffer pointed by 66 // PlatformInformationRecord for output. 67 // 68 TopOfTemporaryRam = (UINT32)(UINTN)TopOfTemporaryRamPpi - sizeof (UINT32); 69 TopOfTemporaryRam -= sizeof(UINT32) * 2; 70 Count = *((UINT32 *)(UINTN) (TopOfTemporaryRam - sizeof (UINT32))); 71 Size = Count * sizeof (IA32_HANDOFF_STATUS); 72 73 if ((*StructureSize) < (UINT64) Size) { 74 *StructureSize = Size; 75 return EFI_BUFFER_TOO_SMALL; 76 } 77 78 *StructureSize = Size; 79 Bist = (UINT32 *) (TopOfTemporaryRam - sizeof (UINT32) - Size); 80 81 CopyMem (PlatformInformationRecord, Bist, Size); 82 83 return EFI_SUCCESS; 84 } 85
