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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\r
b26f0cf9 10 SPDX-License-Identifier: BSD-2-Clause-Patent\r
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11**/\r
12\r
13#include <Library/CacheMaintenanceLib.h>\r
14#include <Library/DebugLib.h>\r
15#include <Library/PeiServicesLib.h>\r
16#include <Ppi/MpServices.h>\r
17\r
18#include "Platform.h"\r
19\r
20/**\r
21 Invalidate data & instruction caches.\r
22 All APs execute this function in parallel. The BSP executes the function\r
23 separately.\r
24\r
25 @param[in,out] WorkSpace Pointer to the input/output argument workspace\r
26 shared by all processors.\r
27**/\r
28STATIC\r
29VOID\r
30EFIAPI\r
31ClearCache (\r
ac0a286f 32 IN OUT VOID *WorkSpace\r
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33 )\r
34{\r
35 WriteBackInvalidateDataCache ();\r
36 InvalidateInstructionCache ();\r
37}\r
38\r
39/**\r
40 Notification function called when EFI_PEI_MP_SERVICES_PPI becomes available.\r
41\r
42 @param[in] PeiServices Indirect reference to the PEI Services Table.\r
43 @param[in] NotifyDescriptor Address of the notification descriptor data\r
44 structure.\r
45 @param[in] Ppi Address of the PPI that was installed.\r
46\r
47 @return Status of the notification. The status code returned from this\r
48 function is ignored.\r
49**/\r
50STATIC\r
51EFI_STATUS\r
52EFIAPI\r
53ClearCacheOnMpServicesAvailable (\r
54 IN EFI_PEI_SERVICES **PeiServices,\r
55 IN EFI_PEI_NOTIFY_DESCRIPTOR *NotifyDescriptor,\r
56 IN VOID *Ppi\r
57 )\r
58{\r
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59 EFI_PEI_MP_SERVICES_PPI *MpServices;\r
60 EFI_STATUS Status;\r
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61\r
62 DEBUG ((DEBUG_INFO, "%a: %a\n", gEfiCallerBaseName, __FUNCTION__));\r
63\r
64 //\r
65 // Clear cache on all the APs in parallel.\r
66 //\r
67 MpServices = Ppi;\r
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68 Status = MpServices->StartupAllAPs (\r
69 (CONST EFI_PEI_SERVICES **)PeiServices,\r
70 MpServices,\r
71 ClearCache, // Procedure\r
72 FALSE, // SingleThread\r
73 0, // TimeoutInMicroSeconds: inf.\r
74 NULL // ProcedureArgument\r
75 );\r
76 if (EFI_ERROR (Status) && (Status != EFI_NOT_STARTED)) {\r
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77 DEBUG ((DEBUG_ERROR, "%a: StartupAllAps(): %r\n", __FUNCTION__, Status));\r
78 return Status;\r
79 }\r
80\r
81 //\r
82 // Now clear cache on the BSP too.\r
83 //\r
84 ClearCache (NULL);\r
85 return EFI_SUCCESS;\r
86}\r
87\r
88//\r
89// Notification object for registering the callback, for when\r
90// EFI_PEI_MP_SERVICES_PPI becomes available.\r
91//\r
ac0a286f 92STATIC CONST EFI_PEI_NOTIFY_DESCRIPTOR mMpServicesNotify = {\r
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93 EFI_PEI_PPI_DESCRIPTOR_NOTIFY_CALLBACK | // Flags\r
94 EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST,\r
95 &gEfiPeiMpServicesPpiGuid, // Guid\r
96 ClearCacheOnMpServicesAvailable // Notify\r
97};\r
98\r
99VOID\r
100InstallClearCacheCallback (\r
101 VOID\r
102 )\r
103{\r
ac0a286f 104 EFI_STATUS Status;\r
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105\r
106 Status = PeiServicesNotifyPpi (&mMpServicesNotify);\r
107 if (EFI_ERROR (Status)) {\r
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108 DEBUG ((\r
109 DEBUG_ERROR,\r
110 "%a: failed to set up MP Services callback: %r\n",\r
111 __FUNCTION__,\r
112 Status\r
113 ));\r
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114 }\r
115}\r