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1 | /** @file\r |
2 | \r | |
60274cca | 3 | Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r |
2ef2b01e | 4 | \r |
60274cca | 5 | This program and the accompanying materials\r |
2ef2b01e A |
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 <Uefi.h>\r | |
16 | \r | |
17 | #include <Library/BaseLib.h>\r | |
18 | #include <Library/DebugLib.h>\r | |
19 | #include <Library/UefiBootServicesTableLib.h>\r | |
20 | #include <Library/UefiRuntimeServicesTableLib.h>\r | |
21 | \r | |
22 | #include <Protocol/MonotonicCounter.h>\r | |
23 | \r | |
24 | UINT64 gCurrentMonotonicCount = 0;\r | |
25 | \r | |
26 | EFI_STATUS\r | |
27 | EFIAPI\r | |
28 | GetNextMonotonicCount (\r | |
29 | OUT UINT64 *Count\r | |
30 | )\r | |
31 | {\r | |
32 | if (Count == NULL) {\r | |
33 | return EFI_INVALID_PARAMETER;\r | |
34 | }\r | |
35 | \r | |
36 | *Count = gCurrentMonotonicCount++;\r | |
37 | return EFI_SUCCESS;\r | |
38 | }\r | |
39 | \r | |
40 | EFI_STATUS\r | |
41 | EFIAPI\r | |
42 | GetNextHighMonotonicCount (\r | |
43 | OUT UINT32 *HighCount\r | |
44 | )\r | |
45 | {\r | |
46 | if (HighCount == NULL) {\r | |
47 | return EFI_INVALID_PARAMETER;\r | |
48 | }\r | |
49 | \r | |
50 | gCurrentMonotonicCount += 0x0000000100000000ULL;\r | |
51 | \r | |
33e4913c | 52 | *HighCount = (UINT32)RShiftU64 (gCurrentMonotonicCount, 32) & 0xFFFFFFFF;\r |
2ef2b01e A |
53 | \r |
54 | return EFI_SUCCESS;\r | |
55 | }\r | |
56 | \r | |
57 | \r | |
58 | EFI_STATUS\r | |
59 | EFIAPI\r | |
60 | MonotonicCounterDriverInitialize (\r | |
61 | IN EFI_HANDLE ImageHandle,\r | |
62 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
63 | )\r | |
64 | {\r | |
65 | EFI_STATUS Status;\r | |
66 | EFI_HANDLE Handle = NULL;\r | |
67 | \r | |
68 | // Make sure the Monotonic Counter Architectural Protocol is not already installed in the system\r | |
69 | ASSERT_PROTOCOL_ALREADY_INSTALLED(NULL, &gEfiMonotonicCounterArchProtocolGuid);\r | |
70 | \r | |
71 | // Fill in the EFI Boot Services and EFI Runtime Services Monotonic Counter Fields\r | |
72 | gBS->GetNextMonotonicCount = GetNextMonotonicCount;\r | |
73 | gRT->GetNextHighMonotonicCount = GetNextHighMonotonicCount;\r | |
74 | \r | |
75 | // Install the Monotonic Counter Architctural Protocol onto a new handle\r | |
76 | Status = gBS->InstallMultipleProtocolInterfaces (\r | |
77 | &Handle,\r | |
78 | &gEfiMonotonicCounterArchProtocolGuid, NULL,\r | |
79 | NULL\r | |
80 | );\r | |
81 | return Status;\r | |
82 | }\r |