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3b96221f AP |
1 | /**@file\r |
2 | Install a callback to clear cache on all processors.\r | |
3 | This is for conformance with the TCG "Platform Reset Attack Mitigation\r | |
4 | Specification". Because clearing the CPU caches at boot doesn't impact\r | |
5 | performance significantly, do it unconditionally, for simplicity's\r | |
6 | sake.\r | |
7 | \r | |
8 | Copyright (C) 2018, Red Hat, Inc.\r | |
9 | Copyright (c) 2019, Citrix Systems, Inc.\r | |
10 | \r | |
11 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
12 | **/\r | |
13 | \r | |
14 | #include <Library/CacheMaintenanceLib.h>\r | |
15 | #include <Library/DebugLib.h>\r | |
16 | #include <Library/PeiServicesLib.h>\r | |
17 | #include <Ppi/MpServices.h>\r | |
18 | \r | |
19 | #include "Platform.h"\r | |
20 | \r | |
21 | /**\r | |
22 | Invalidate data & instruction caches.\r | |
23 | All APs execute this function in parallel. The BSP executes the function\r | |
24 | separately.\r | |
25 | \r | |
26 | @param[in,out] WorkSpace Pointer to the input/output argument workspace\r | |
27 | shared by all processors.\r | |
28 | **/\r | |
29 | STATIC\r | |
30 | VOID\r | |
31 | EFIAPI\r | |
32 | ClearCache (\r | |
ac0a286f | 33 | IN OUT VOID *WorkSpace\r |
3b96221f AP |
34 | )\r |
35 | {\r | |
36 | WriteBackInvalidateDataCache ();\r | |
37 | InvalidateInstructionCache ();\r | |
38 | }\r | |
39 | \r | |
40 | /**\r | |
41 | Notification function called when EFI_PEI_MP_SERVICES_PPI becomes available.\r | |
42 | \r | |
43 | @param[in] PeiServices Indirect reference to the PEI Services Table.\r | |
44 | @param[in] NotifyDescriptor Address of the notification descriptor data\r | |
45 | structure.\r | |
46 | @param[in] Ppi Address of the PPI that was installed.\r | |
47 | \r | |
48 | @return Status of the notification. The status code returned from this\r | |
49 | function is ignored.\r | |
50 | **/\r | |
51 | STATIC\r | |
52 | EFI_STATUS\r | |
53 | EFIAPI\r | |
54 | ClearCacheOnMpServicesAvailable (\r | |
55 | IN EFI_PEI_SERVICES **PeiServices,\r | |
56 | IN EFI_PEI_NOTIFY_DESCRIPTOR *NotifyDescriptor,\r | |
57 | IN VOID *Ppi\r | |
58 | )\r | |
59 | {\r | |
ac0a286f MK |
60 | EFI_PEI_MP_SERVICES_PPI *MpServices;\r |
61 | EFI_STATUS Status;\r | |
3b96221f AP |
62 | \r |
63 | DEBUG ((DEBUG_INFO, "%a: %a\n", gEfiCallerBaseName, __FUNCTION__));\r | |
64 | \r | |
65 | //\r | |
66 | // Clear cache on all the APs in parallel.\r | |
67 | //\r | |
68 | MpServices = Ppi;\r | |
ac0a286f MK |
69 | Status = MpServices->StartupAllAPs (\r |
70 | (CONST EFI_PEI_SERVICES **)PeiServices,\r | |
71 | MpServices,\r | |
72 | ClearCache, // Procedure\r | |
73 | FALSE, // SingleThread\r | |
74 | 0, // TimeoutInMicroSeconds: inf.\r | |
75 | NULL // ProcedureArgument\r | |
76 | );\r | |
77 | if (EFI_ERROR (Status) && (Status != EFI_NOT_STARTED)) {\r | |
3b96221f AP |
78 | DEBUG ((DEBUG_ERROR, "%a: StartupAllAps(): %r\n", __FUNCTION__, Status));\r |
79 | return Status;\r | |
80 | }\r | |
81 | \r | |
82 | //\r | |
83 | // Now clear cache on the BSP too.\r | |
84 | //\r | |
85 | ClearCache (NULL);\r | |
86 | return EFI_SUCCESS;\r | |
87 | }\r | |
88 | \r | |
89 | //\r | |
90 | // Notification object for registering the callback, for when\r | |
91 | // EFI_PEI_MP_SERVICES_PPI becomes available.\r | |
92 | //\r | |
ac0a286f | 93 | STATIC CONST EFI_PEI_NOTIFY_DESCRIPTOR mMpServicesNotify = {\r |
3b96221f AP |
94 | EFI_PEI_PPI_DESCRIPTOR_NOTIFY_CALLBACK | // Flags\r |
95 | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST,\r | |
96 | &gEfiPeiMpServicesPpiGuid, // Guid\r | |
97 | ClearCacheOnMpServicesAvailable // Notify\r | |
98 | };\r | |
99 | \r | |
100 | VOID\r | |
101 | InstallClearCacheCallback (\r | |
102 | VOID\r | |
103 | )\r | |
104 | {\r | |
ac0a286f | 105 | EFI_STATUS Status;\r |
3b96221f AP |
106 | \r |
107 | Status = PeiServicesNotifyPpi (&mMpServicesNotify);\r | |
108 | if (EFI_ERROR (Status)) {\r | |
ac0a286f MK |
109 | DEBUG ((\r |
110 | DEBUG_ERROR,\r | |
111 | "%a: failed to set up MP Services callback: %r\n",\r | |
112 | __FUNCTION__,\r | |
113 | Status\r | |
114 | ));\r | |
3b96221f AP |
115 | }\r |
116 | }\r |