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