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cf1d4549 JY |
1 | /** @file\r |
2 | Sample to provide SecPlatformInformation function.\r | |
3 | \r | |
4 | Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>\r | |
512e23a3 | 5 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
cf1d4549 JY |
6 | \r |
7 | **/\r | |
8 | \r | |
9 | #include <PiPei.h>\r | |
10 | \r | |
11 | #include <Ppi/SecPlatformInformation.h>\r | |
12 | #include <Ppi/TopOfTemporaryRam.h>\r | |
13 | \r | |
14 | #include <Library/BaseMemoryLib.h>\r | |
15 | #include <Library/DebugLib.h>\r | |
16 | \r | |
17 | /**\r | |
18 | This interface conveys state information out of the Security (SEC) phase into PEI.\r | |
19 | \r | |
20 | @param[in] PeiServices Pointer to the PEI Services Table.\r | |
21 | @param[in,out] StructureSize Pointer to the variable describing size of the input buffer.\r | |
22 | @param[out] PlatformInformationRecord Pointer to the EFI_SEC_PLATFORM_INFORMATION_RECORD.\r | |
23 | \r | |
24 | @retval EFI_SUCCESS The data was successfully returned.\r | |
25 | @retval EFI_BUFFER_TOO_SMALL The buffer was too small.\r | |
26 | \r | |
27 | **/\r | |
28 | EFI_STATUS\r | |
29 | EFIAPI\r | |
30 | SecPlatformInformation (\r | |
31 | IN CONST EFI_PEI_SERVICES **PeiServices,\r | |
32 | IN OUT UINT64 *StructureSize,\r | |
33 | OUT EFI_SEC_PLATFORM_INFORMATION_RECORD *PlatformInformationRecord\r | |
34 | )\r | |
35 | {\r | |
36 | UINT32 *Bist;\r | |
37 | UINT32 Size;\r | |
38 | UINT32 Count;\r | |
39 | UINT32 TopOfTemporaryRam;\r | |
40 | VOID *TopOfTemporaryRamPpi;\r | |
41 | EFI_STATUS Status;\r | |
42 | \r | |
43 | DEBUG ((DEBUG_INFO, "SecPlatformInformation\n"));\r | |
44 | \r | |
45 | Status = (*PeiServices)->LocatePpi (\r | |
46 | PeiServices,\r | |
47 | &gTopOfTemporaryRamPpiGuid,\r | |
48 | 0,\r | |
49 | NULL,\r | |
50 | (VOID **) &TopOfTemporaryRamPpi\r | |
51 | );\r | |
52 | if (EFI_ERROR (Status)) {\r | |
53 | return EFI_NOT_FOUND;\r | |
54 | }\r | |
55 | \r | |
56 | //\r | |
57 | // The entries of BIST information, together with the number of them,\r | |
58 | // reside in the bottom of stack, left untouched by normal stack operation.\r | |
59 | // This routine copies the BIST information to the buffer pointed by\r | |
60 | // PlatformInformationRecord for output.\r | |
61 | //\r | |
62 | TopOfTemporaryRam = (UINT32)(UINTN)TopOfTemporaryRamPpi - sizeof (UINT32);\r | |
63 | TopOfTemporaryRam -= sizeof(UINT32) * 2;\r | |
64 | Count = *((UINT32 *)(UINTN) (TopOfTemporaryRam - sizeof (UINT32)));\r | |
65 | Size = Count * sizeof (IA32_HANDOFF_STATUS);\r | |
66 | \r | |
67 | if ((*StructureSize) < (UINT64) Size) {\r | |
68 | *StructureSize = Size;\r | |
69 | return EFI_BUFFER_TOO_SMALL;\r | |
70 | }\r | |
71 | \r | |
72 | *StructureSize = Size;\r | |
73 | Bist = (UINT32 *) (TopOfTemporaryRam - sizeof (UINT32) - Size);\r | |
74 | \r | |
75 | CopyMem (PlatformInformationRecord, Bist, Size);\r | |
76 | \r | |
77 | return EFI_SUCCESS;\r | |
78 | }\r |