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1 | /** @file\r | |
2 | This module sets default policy for attributes of EfiACPIMemoryNVS and EfiReservedMemoryType.\r | |
3 | \r | |
4 | This module sets EFI_MEMORY_XP for attributes of EfiACPIMemoryNVS and EfiReservedMemoryType\r | |
5 | in UEFI memory map, if and only of PropertiesTable is published and has BIT0 set.\r | |
6 | \r | |
7 | Copyright (c) 2015 - 2018, Intel Corporation. All rights reserved.<BR>\r | |
8 | This program and the accompanying materials\r | |
9 | are licensed and made available under the terms and conditions of the BSD License\r | |
10 | which accompanies this distribution. The full text of the license may be found at\r | |
11 | http://opensource.org/licenses/bsd-license.php\r | |
12 | \r | |
13 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
14 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
15 | \r | |
16 | **/\r | |
17 | \r | |
18 | #include <Uefi.h>\r | |
19 | #include <Library/DebugLib.h>\r | |
20 | #include <Library/UefiBootServicesTableLib.h>\r | |
21 | #include <Library/DxeServicesTableLib.h>\r | |
22 | #include <Library/UefiLib.h>\r | |
23 | #include <Library/MemoryAllocationLib.h>\r | |
24 | #include <Guid/EventGroup.h>\r | |
25 | #include <Guid/PropertiesTable.h>\r | |
26 | \r | |
27 | /**\r | |
28 | Converts a number of EFI_PAGEs to a size in bytes.\r | |
29 | \r | |
30 | NOTE: Do not use EFI_PAGES_TO_SIZE because it handles UINTN only.\r | |
31 | \r | |
32 | @param Pages The number of EFI_PAGES.\r | |
33 | \r | |
34 | @return The number of bytes associated with the number of EFI_PAGEs specified\r | |
35 | by Pages.\r | |
36 | **/\r | |
37 | UINT64\r | |
38 | EfiPagesToSize (\r | |
39 | IN UINT64 Pages\r | |
40 | )\r | |
41 | {\r | |
42 | return LShiftU64 (Pages, EFI_PAGE_SHIFT);\r | |
43 | }\r | |
44 | \r | |
45 | /**\r | |
46 | Set memory attributes according to default policy.\r | |
47 | \r | |
48 | @param MemoryMap A pointer to the buffer in which firmware places the current memory map.\r | |
49 | @param MemoryMapSize Size, in bytes, of the MemoryMap buffer.\r | |
50 | @param DescriptorSize size, in bytes, of an individual EFI_MEMORY_DESCRIPTOR.\r | |
51 | **/\r | |
52 | VOID\r | |
53 | SetMemorySpaceAttributesDefault (\r | |
54 | IN EFI_MEMORY_DESCRIPTOR *MemoryMap,\r | |
55 | IN UINTN MemoryMapSize,\r | |
56 | IN UINTN DescriptorSize\r | |
57 | )\r | |
58 | {\r | |
59 | EFI_MEMORY_DESCRIPTOR *MemoryMapEntry;\r | |
60 | EFI_MEMORY_DESCRIPTOR *MemoryMapEnd;\r | |
61 | EFI_STATUS Status;\r | |
62 | \r | |
63 | DEBUG ((EFI_D_INFO, "SetMemorySpaceAttributesDefault\n"));\r | |
64 | \r | |
65 | MemoryMapEntry = MemoryMap;\r | |
66 | MemoryMapEnd = (EFI_MEMORY_DESCRIPTOR *) ((UINT8 *) MemoryMap + MemoryMapSize);\r | |
67 | while ((UINTN)MemoryMapEntry < (UINTN)MemoryMapEnd) {\r | |
68 | if (MemoryMapEntry->PhysicalStart < BASE_1MB) {\r | |
69 | //\r | |
70 | // Do not touch memory space below 1MB\r | |
71 | //\r | |
72 | MemoryMapEntry = NEXT_MEMORY_DESCRIPTOR (MemoryMapEntry, DescriptorSize);\r | |
73 | continue;\r | |
74 | }\r | |
75 | switch (MemoryMapEntry->Type) {\r | |
76 | case EfiRuntimeServicesCode:\r | |
77 | case EfiRuntimeServicesData:\r | |
78 | //\r | |
79 | // should be handled later;\r | |
80 | //\r | |
81 | break;\r | |
82 | case EfiReservedMemoryType:\r | |
83 | case EfiACPIMemoryNVS:\r | |
84 | //\r | |
85 | // Handle EfiReservedMemoryType and EfiACPIMemoryNVS, because there might be firmware executable there.\r | |
86 | //\r | |
87 | DEBUG ((EFI_D_INFO, "SetMemorySpaceAttributes - %016lx - %016lx (%016lx) ...\n",\r | |
88 | MemoryMapEntry->PhysicalStart,\r | |
89 | MemoryMapEntry->PhysicalStart + EfiPagesToSize (MemoryMapEntry->NumberOfPages),\r | |
90 | MemoryMapEntry->Attribute\r | |
91 | ));\r | |
92 | Status = gDS->SetMemorySpaceCapabilities (\r | |
93 | MemoryMapEntry->PhysicalStart,\r | |
94 | EfiPagesToSize (MemoryMapEntry->NumberOfPages),\r | |
95 | MemoryMapEntry->Attribute | EFI_MEMORY_XP\r | |
96 | );\r | |
97 | DEBUG ((EFI_D_INFO, "SetMemorySpaceCapabilities - %r\n", Status));\r | |
98 | break;\r | |
99 | }\r | |
100 | \r | |
101 | MemoryMapEntry = NEXT_MEMORY_DESCRIPTOR (MemoryMapEntry, DescriptorSize);\r | |
102 | }\r | |
103 | \r | |
104 | return ;\r | |
105 | }\r | |
106 | \r | |
107 | /**\r | |
108 | Update memory attributes according to default policy.\r | |
109 | \r | |
110 | @param[in] Event The Event this notify function registered to.\r | |
111 | @param[in] Context Pointer to the context data registered to the Event.\r | |
112 | **/\r | |
113 | VOID\r | |
114 | EFIAPI\r | |
115 | UpdateMemoryAttributesDefault (\r | |
116 | EFI_EVENT Event,\r | |
117 | VOID *Context\r | |
118 | )\r | |
119 | {\r | |
120 | EFI_STATUS Status;\r | |
121 | EFI_MEMORY_DESCRIPTOR *MemoryMap;\r | |
122 | UINTN MemoryMapSize;\r | |
123 | UINTN MapKey;\r | |
124 | UINTN DescriptorSize;\r | |
125 | UINT32 DescriptorVersion;\r | |
126 | EFI_PROPERTIES_TABLE *PropertiesTable;\r | |
127 | \r | |
128 | DEBUG ((EFI_D_INFO, "UpdateMemoryAttributesDefault\n"));\r | |
129 | Status = EfiGetSystemConfigurationTable (&gEfiPropertiesTableGuid, (VOID **) &PropertiesTable);\r | |
130 | if (EFI_ERROR (Status)) {\r | |
131 | goto Done;\r | |
132 | }\r | |
133 | \r | |
134 | ASSERT (PropertiesTable != NULL);\r | |
135 | \r | |
136 | DEBUG ((EFI_D_INFO, "MemoryProtectionAttribute - 0x%016lx\n", PropertiesTable->MemoryProtectionAttribute));\r | |
137 | if ((PropertiesTable->MemoryProtectionAttribute & EFI_PROPERTIES_RUNTIME_MEMORY_PROTECTION_NON_EXECUTABLE_PE_DATA) == 0) {\r | |
138 | goto Done;\r | |
139 | }\r | |
140 | \r | |
141 | //\r | |
142 | // Get the EFI memory map.\r | |
143 | //\r | |
144 | MemoryMapSize = 0;\r | |
145 | MemoryMap = NULL;\r | |
146 | Status = gBS->GetMemoryMap (\r | |
147 | &MemoryMapSize,\r | |
148 | MemoryMap,\r | |
149 | &MapKey,\r | |
150 | &DescriptorSize,\r | |
151 | &DescriptorVersion\r | |
152 | );\r | |
153 | ASSERT (Status == EFI_BUFFER_TOO_SMALL);\r | |
154 | do {\r | |
155 | MemoryMap = (EFI_MEMORY_DESCRIPTOR *) AllocatePool (MemoryMapSize);\r | |
156 | ASSERT (MemoryMap != NULL);\r | |
157 | Status = gBS->GetMemoryMap (\r | |
158 | &MemoryMapSize,\r | |
159 | MemoryMap,\r | |
160 | &MapKey,\r | |
161 | &DescriptorSize,\r | |
162 | &DescriptorVersion\r | |
163 | );\r | |
164 | if (EFI_ERROR (Status)) {\r | |
165 | FreePool (MemoryMap);\r | |
166 | }\r | |
167 | } while (Status == EFI_BUFFER_TOO_SMALL);\r | |
168 | ASSERT_EFI_ERROR (Status);\r | |
169 | \r | |
170 | SetMemorySpaceAttributesDefault (MemoryMap, MemoryMapSize, DescriptorSize);\r | |
171 | \r | |
172 | Done:\r | |
173 | gBS->CloseEvent (Event);\r | |
174 | \r | |
175 | return ;\r | |
176 | }\r | |
177 | \r | |
178 | /**\r | |
179 | The entrypoint of properties table attribute driver.\r | |
180 | \r | |
181 | @param ImageHandle The firmware allocated handle for the EFI image.\r | |
182 | @param SystemTable A pointer to the EFI System Table.\r | |
183 | \r | |
184 | @retval EFI_SUCCESS It always returns EFI_SUCCESS.\r | |
185 | \r | |
186 | **/\r | |
187 | EFI_STATUS\r | |
188 | EFIAPI\r | |
189 | InitializePropertiesTableAttributesDxe (\r | |
190 | IN EFI_HANDLE ImageHandle,\r | |
191 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
192 | )\r | |
193 | {\r | |
194 | EFI_STATUS Status;\r | |
195 | EFI_EVENT ReadyToBootEvent;\r | |
196 | \r | |
197 | Status = gBS->CreateEventEx (\r | |
198 | EVT_NOTIFY_SIGNAL,\r | |
199 | TPL_CALLBACK,\r | |
200 | UpdateMemoryAttributesDefault,\r | |
201 | NULL,\r | |
202 | &gEfiEventReadyToBootGuid,\r | |
203 | &ReadyToBootEvent\r | |
204 | );\r | |
205 | ASSERT_EFI_ERROR (Status);\r | |
206 | \r | |
207 | return EFI_SUCCESS;\r | |
208 | }\r |