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