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1 | /** @file\r |
2 | \r | |
3 | Copyright (c) 2016 HP Development Company, L.P.\r | |
4 | Copyright (c) 2016 - 2018, ARM Limited. All rights reserved.\r | |
5 | \r | |
6 | This program and the accompanying materials\r | |
7 | are licensed and made available under the terms and conditions of the BSD License\r | |
8 | which accompanies this distribution. The full text of the license may be found at\r | |
9 | http://opensource.org/licenses/bsd-license.php\r | |
10 | \r | |
11 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
12 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
13 | \r | |
14 | **/\r | |
15 | \r | |
16 | #include <Base.h>\r | |
17 | #include <Pi/PiMmCis.h>\r | |
18 | \r | |
19 | \r | |
20 | #include <Library/ArmSvcLib.h>\r | |
21 | #include <Library/ArmLib.h>\r | |
22 | #include <Library/BaseMemoryLib.h>\r | |
23 | #include <Library/DebugLib.h>\r | |
24 | #include <Library/HobLib.h>\r | |
25 | \r | |
26 | #include <Protocol/DebugSupport.h> // for EFI_SYSTEM_CONTEXT\r | |
27 | \r | |
28 | #include <Guid/ZeroGuid.h>\r | |
29 | #include <Guid/MmramMemoryReserve.h>\r | |
30 | \r | |
31 | #include <IndustryStandard/ArmStdSmc.h>\r | |
32 | \r | |
33 | #include "StandaloneMmCpu.h"\r | |
34 | \r | |
35 | EFI_STATUS\r | |
36 | EFIAPI\r | |
37 | MmFoundationEntryRegister (\r | |
38 | IN CONST EFI_MM_CONFIGURATION_PROTOCOL *This,\r | |
39 | IN EFI_MM_ENTRY_POINT MmEntryPoint\r | |
40 | );\r | |
41 | \r | |
42 | //\r | |
43 | // On ARM platforms every event is expected to have a GUID associated with\r | |
44 | // it. It will be used by the MM Entry point to find the handler for the\r | |
45 | // event. It will either be populated in a EFI_MM_COMMUNICATE_HEADER by the\r | |
46 | // caller of the event (e.g. MM_COMMUNICATE SMC) or by the CPU driver\r | |
47 | // (e.g. during an asynchronous event). In either case, this context is\r | |
48 | // maintained in an array which has an entry for each CPU. The pointer to this\r | |
49 | // array is held in PerCpuGuidedEventContext. Memory is allocated once the\r | |
50 | // number of CPUs in the system are made known through the\r | |
51 | // MP_INFORMATION_HOB_DATA.\r | |
52 | //\r | |
53 | EFI_MM_COMMUNICATE_HEADER **PerCpuGuidedEventContext = NULL;\r | |
54 | \r | |
55 | // Descriptor with whereabouts of memory used for communication with the normal world\r | |
56 | EFI_MMRAM_DESCRIPTOR mNsCommBuffer;\r | |
57 | \r | |
58 | MP_INFORMATION_HOB_DATA *mMpInformationHobData;\r | |
59 | \r | |
60 | EFI_MM_CONFIGURATION_PROTOCOL mMmConfig = {\r | |
61 | 0,\r | |
62 | MmFoundationEntryRegister\r | |
63 | };\r | |
64 | \r | |
65 | STATIC EFI_MM_ENTRY_POINT mMmEntryPoint = NULL;\r | |
66 | \r | |
67 | EFI_STATUS\r | |
68 | PiMmStandloneArmTfCpuDriverEntry (\r | |
69 | IN UINTN EventId,\r | |
70 | IN UINTN CpuNumber,\r | |
71 | IN UINTN NsCommBufferAddr\r | |
72 | )\r | |
73 | {\r | |
74 | EFI_MM_COMMUNICATE_HEADER *GuidedEventContext = NULL;\r | |
75 | EFI_MM_ENTRY_CONTEXT MmEntryPointContext = {0};\r | |
76 | EFI_STATUS Status;\r | |
77 | UINTN NsCommBufferSize;\r | |
78 | \r | |
79 | DEBUG ((DEBUG_INFO, "Received event - 0x%x on cpu %d\n", EventId, CpuNumber));\r | |
80 | \r | |
81 | Status = EFI_SUCCESS;\r | |
82 | //\r | |
83 | // ARM TF passes SMC FID of the MM_COMMUNICATE interface as the Event ID upon\r | |
84 | // receipt of a synchronous MM request. Use the Event ID to distinguish\r | |
85 | // between synchronous and asynchronous events.\r | |
86 | //\r | |
87 | if (ARM_SMC_ID_MM_COMMUNICATE_AARCH64 != EventId) {\r | |
88 | DEBUG ((DEBUG_INFO, "UnRecognized Event - 0x%x\n", EventId));\r | |
89 | return EFI_INVALID_PARAMETER;\r | |
90 | }\r | |
91 | \r | |
92 | // Perform parameter validation of NsCommBufferAddr\r | |
93 | if (NsCommBufferAddr && (NsCommBufferAddr < mNsCommBuffer.PhysicalStart))\r | |
94 | return EFI_ACCESS_DENIED;\r | |
95 | \r | |
96 | if ((NsCommBufferAddr + sizeof (EFI_MM_COMMUNICATE_HEADER)) >=\r | |
97 | (mNsCommBuffer.PhysicalStart + mNsCommBuffer.PhysicalSize))\r | |
98 | return EFI_INVALID_PARAMETER;\r | |
99 | \r | |
100 | // Find out the size of the buffer passed\r | |
101 | NsCommBufferSize = ((EFI_MM_COMMUNICATE_HEADER *) NsCommBufferAddr)->MessageLength +\r | |
102 | sizeof (EFI_MM_COMMUNICATE_HEADER);\r | |
103 | \r | |
104 | // perform bounds check.\r | |
105 | if (NsCommBufferAddr + NsCommBufferSize >=\r | |
106 | mNsCommBuffer.PhysicalStart + mNsCommBuffer.PhysicalSize)\r | |
107 | return EFI_ACCESS_DENIED;\r | |
108 | \r | |
109 | \r | |
110 | // Now that the secure world can see the normal world buffer, allocate\r | |
111 | // memory to copy the communication buffer to the secure world.\r | |
112 | Status = mMmst->MmAllocatePool (\r | |
113 | EfiRuntimeServicesData,\r | |
114 | NsCommBufferSize,\r | |
115 | (VOID **) &GuidedEventContext\r | |
116 | );\r | |
117 | \r | |
118 | if (Status != EFI_SUCCESS) {\r | |
119 | DEBUG ((DEBUG_INFO, "Mem alloc failed - 0x%x\n", EventId));\r | |
120 | return EFI_OUT_OF_RESOURCES;\r | |
121 | }\r | |
122 | \r | |
123 | // X1 contains the VA of the normal world memory accessible from\r | |
124 | // S-EL0\r | |
125 | CopyMem (GuidedEventContext, (CONST VOID *) NsCommBufferAddr, NsCommBufferSize);\r | |
126 | \r | |
127 | // Stash the pointer to the allocated Event Context for this CPU\r | |
128 | PerCpuGuidedEventContext[CpuNumber] = GuidedEventContext;\r | |
129 | \r | |
130 | MmEntryPointContext.CurrentlyExecutingCpu = CpuNumber;\r | |
131 | MmEntryPointContext.NumberOfCpus = mMpInformationHobData->NumberOfProcessors;\r | |
132 | \r | |
133 | // Populate the MM system table with MP and state information\r | |
134 | mMmst->CurrentlyExecutingCpu = CpuNumber;\r | |
135 | mMmst->NumberOfCpus = mMpInformationHobData->NumberOfProcessors;\r | |
136 | mMmst->CpuSaveStateSize = 0;\r | |
137 | mMmst->CpuSaveState = NULL;\r | |
138 | \r | |
139 | if (mMmEntryPoint == NULL) {\r | |
140 | DEBUG ((DEBUG_INFO, "Mm Entry point Not Found\n"));\r | |
141 | return EFI_UNSUPPORTED;\r | |
142 | }\r | |
143 | \r | |
144 | mMmEntryPoint (&MmEntryPointContext);\r | |
145 | \r | |
146 | // Free the memory allocation done earlier and reset the per-cpu context\r | |
147 | ASSERT (GuidedEventContext);\r | |
148 | CopyMem ((VOID *)NsCommBufferAddr, (CONST VOID *) GuidedEventContext, NsCommBufferSize);\r | |
149 | \r | |
150 | Status = mMmst->MmFreePool ((VOID *) GuidedEventContext);\r | |
151 | if (Status != EFI_SUCCESS) {\r | |
152 | return EFI_OUT_OF_RESOURCES;\r | |
153 | }\r | |
154 | PerCpuGuidedEventContext[CpuNumber] = NULL;\r | |
155 | \r | |
156 | return Status;\r | |
157 | }\r | |
158 | \r | |
159 | EFI_STATUS\r | |
160 | EFIAPI\r | |
161 | MmFoundationEntryRegister (\r | |
162 | IN CONST EFI_MM_CONFIGURATION_PROTOCOL *This,\r | |
163 | IN EFI_MM_ENTRY_POINT MmEntryPoint\r | |
164 | )\r | |
165 | {\r | |
166 | // store the entry point in a global\r | |
167 | mMmEntryPoint = MmEntryPoint;\r | |
168 | return EFI_SUCCESS;\r | |
169 | }\r | |
170 | \r | |
171 | /**\r | |
172 | This function is the main entry point for an MM handler dispatch\r | |
173 | or communicate-based callback.\r | |
174 | \r | |
175 | @param DispatchHandle The unique handle assigned to this handler by MmiHandlerRegister().\r | |
176 | @param Context Points to an optional handler context which was specified when the handler was registered.\r | |
177 | @param CommBuffer A pointer to a collection of data in memory that will\r | |
178 | be conveyed from a non-MM environment into an MM environment.\r | |
179 | @param CommBufferSize The size of the CommBuffer.\r | |
180 | \r | |
181 | @return Status Code\r | |
182 | \r | |
183 | **/\r | |
184 | EFI_STATUS\r | |
185 | EFIAPI\r | |
186 | PiMmCpuTpFwRootMmiHandler (\r | |
187 | IN EFI_HANDLE DispatchHandle,\r | |
188 | IN CONST VOID *Context, OPTIONAL\r | |
189 | IN OUT VOID *CommBuffer, OPTIONAL\r | |
190 | IN OUT UINTN *CommBufferSize OPTIONAL\r | |
191 | )\r | |
192 | {\r | |
193 | EFI_STATUS Status;\r | |
194 | UINTN CpuNumber;\r | |
195 | \r | |
196 | ASSERT (Context == NULL);\r | |
197 | ASSERT (CommBuffer == NULL);\r | |
198 | ASSERT (CommBufferSize == NULL);\r | |
199 | \r | |
200 | CpuNumber = mMmst->CurrentlyExecutingCpu;\r | |
201 | if (!PerCpuGuidedEventContext[CpuNumber])\r | |
202 | return EFI_NOT_FOUND;\r | |
203 | \r | |
204 | DEBUG ((DEBUG_INFO, "CommBuffer - 0x%x, CommBufferSize - 0x%x\n",\r | |
205 | PerCpuGuidedEventContext[CpuNumber],\r | |
206 | PerCpuGuidedEventContext[CpuNumber]->MessageLength));\r | |
207 | \r | |
208 | Status = mMmst->MmiManage (\r | |
209 | &PerCpuGuidedEventContext[CpuNumber]->HeaderGuid,\r | |
210 | NULL,\r | |
211 | PerCpuGuidedEventContext[CpuNumber]->Data,\r | |
212 | &PerCpuGuidedEventContext[CpuNumber]->MessageLength\r | |
213 | );\r | |
214 | \r | |
215 | if (Status != EFI_SUCCESS) {\r | |
216 | DEBUG ((DEBUG_WARN, "Unable to manage Guided Event - %d\n", Status));\r | |
217 | }\r | |
218 | \r | |
219 | return Status;\r | |
220 | }\r |