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1 | /** @file\r |
2 | Variable services implemented from system memory\r | |
3 | \r | |
4 | There is just a single runtime memory buffer that contans all the data. \r | |
5 | \r | |
60274cca HT |
6 | Copyright (c) 2007, Intel Corporation. All rights reserved.<BR>\r |
7 | Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r | |
2ef2b01e | 8 | \r |
60274cca | 9 | This program and the accompanying materials\r |
2ef2b01e A |
10 | are licensed and made available under the terms and conditions of the BSD License\r |
11 | which accompanies this distribution. The full text of the license may be found at\r | |
12 | http://opensource.org/licenses/bsd-license.php\r | |
13 | \r | |
14 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
15 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
16 | \r | |
17 | \r | |
18 | **/\r | |
19 | \r | |
20 | \r | |
21 | UINT64 mMaximumVariableStorageSize;\r | |
22 | UINT64 mRemainingVariableStorageSize;\r | |
23 | UINT64 mMaximumVariableSize;\r | |
24 | \r | |
25 | typedef struct {\r | |
26 | EFI_GUID VendorGuid;\r | |
27 | UINT32 Attribute;\r | |
28 | UINTN DataSize;\r | |
29 | } VARIABLE_ARRAY_ENTRY;\r | |
30 | // CHAR16 VariableName[]\r | |
31 | // UINT8 Data[]\r | |
32 | \r | |
33 | VARIABLE_ARRAY_ENTRY *mVariableArray = NULL;\r | |
34 | VARIABLE_ARRAY_ENTRY *mVariableArrayNextFree = NULL;\r | |
35 | VARIABLE_ARRAY_ENTRY *mVariableArrayEnd = NULL;\r | |
36 | \r | |
37 | \r | |
38 | VARIABLE_ARRAY_ENTRY *\r | |
39 | AddEntry (\r | |
40 | IN CHAR16 *VariableName,\r | |
41 | IN EFI_GUID *VendorGuid,\r | |
42 | IN UINT32 Attributes,\r | |
43 | IN UINTN DataSize,\r | |
44 | IN VOID *Data\r | |
45 | )\r | |
46 | {\r | |
47 | UINTN Size;\r | |
48 | UINTN SizeOfString;\r | |
49 | VARIABLE_ARRAY_ENTRY *Entry;\r | |
50 | EFI_TPL CurrentTpl;\r | |
51 | \r | |
52 | \r | |
53 | SizeOfString = StrSize (VariableName); \r | |
54 | Size = SizeOfString + sizeof (VARIABLE_ARRAY_ENTRY) + DataSize;\r | |
55 | if ((VARIABLE_ARRAY_ENTRY *)(((UINT8 *)mVariableArrayNextFree) + Size) > mVariableArrayEnd) {\r | |
56 | // ran out of space\r | |
57 | return NULL;\r | |
58 | }\r | |
59 | \r | |
60 | if (!EfiAtRuntime ()) {\r | |
61 | // Enter critical section\r | |
62 | CurrentTpl = gBS->RaiseTPL (EFI_TPL_HIGH_LEVEL);\r | |
63 | }\r | |
64 | \r | |
65 | Entry = mVariableArrayNextFree;\r | |
66 | CopyGuid (&Entry->VendorGuid, VendorGuid);\r | |
67 | Entry->Attribute = Attributes;\r | |
68 | Entry->DataSize = DataSize;\r | |
69 | StrCpy ((CHAR16 *)++mVariableArrayNextFree, VariableName);\r | |
70 | mVariableArrayNextFree = (VARIABLE_ARRAY_ENTRY *)(((UINT8 *)mVariableArrayNextFree) + SizeOfString);\r | |
71 | CopyMem (mVariableArrayNextFree, Data, DataSize);\r | |
72 | mVariableArrayNextFree = (VARIABLE_ARRAY_ENTRY *)(((UINT8 *)mVariableArrayNextFree) + DataSize);\r | |
73 | \r | |
74 | if (!EfiAtRuntime ()) {\r | |
75 | // Exit Critical section\r | |
76 | gBS->RestoreTPL (CurrentTpl);\r | |
77 | }\r | |
78 | \r | |
79 | return Entry;\r | |
80 | }\r | |
81 | \r | |
82 | VOID\r | |
83 | DeleteEntry (\r | |
84 | IN VARIABLE_ARRAY_ENTRY *Entry\r | |
85 | )\r | |
86 | {\r | |
87 | UINTN Size;\r | |
88 | UINT8 *Data;\r | |
89 | EFI_TPL CurrentTpl;\r | |
90 | \r | |
91 | Size = StrSize ((CHAR16 *)(Entry + 1)) + sizeof (VARIABLE_ARRAY_ENTRY) + Entry->DataSize;\r | |
92 | Data = ((UINT8 *)Entry) + Size;\r | |
93 | \r | |
94 | CopyMem (Entry, Data, (UINTN)mVariableArrayNextFree - (UINTN)Data);\r | |
95 | \r | |
96 | if (!EfiAtRuntime ()) {\r | |
97 | // Enter critical section\r | |
98 | CurrentTpl = gBS->RaiseTPL (EFI_TPL_HIGH_LEVEL);\r | |
99 | }\r | |
100 | \r | |
101 | mVariableArrayNextFree = (VARIABLE_ARRAY_ENTRY *)(((UINT8 *)mVariableArrayNextFree) - Size);\r | |
102 | \r | |
103 | if (!EfiAtRuntime ()) {\r | |
104 | // Exit Critical section\r | |
105 | gBS->RestoreTPL (CurrentTpl);\r | |
106 | }\r | |
107 | }\r | |
108 | \r | |
109 | \r | |
110 | VARIABLE_ARRAY_ENTRY *\r | |
111 | GetVariableArrayEntry (\r | |
112 | IN CHAR16 *VariableName,\r | |
113 | IN EFI_GUID *VendorGuid,\r | |
114 | OUT VOID **Data OPTIONAL\r | |
115 | )\r | |
116 | {\r | |
117 | VARIABLE_ARRAY_ENTRY *Entry;\r | |
118 | UINTN Size;\r | |
119 | \r | |
120 | if (*VariableName == L'\0') {\r | |
121 | // by definition first entry is null-terminated string\r | |
122 | if (mVariableArray == mVariableArrayNextFree) {\r | |
123 | return NULL;\r | |
124 | }\r | |
125 | return mVariableArray;\r | |
126 | }\r | |
127 | \r | |
128 | for (Entry = mVariableArray; Entry < mVariableArrayEnd;) {\r | |
129 | if (CompareGuid (VendorGuid, &Entry->VendorGuid)) {\r | |
130 | if (StrCmp (VariableName, (CHAR16 *)(Entry + 1))) {\r | |
131 | Size = StrSize ((CHAR16 *)(Entry + 1));\r | |
132 | if (Data != NULL) {\r | |
133 | *Data = (VOID *)(((UINT8 *)Entry) + (Size + sizeof (VARIABLE_ARRAY_ENTRY)));\r | |
134 | }\r | |
135 | return Entry;\r | |
136 | }\r | |
137 | }\r | |
138 | \r | |
139 | Size = StrSize ((CHAR16 *)(Entry + 1)) + sizeof (VARIABLE_ARRAY_ENTRY) + Entry->DataSize;\r | |
140 | Entry = (VARIABLE_ARRAY_ENTRY *)(((UINT8 *)Entry) + Size);\r | |
141 | }\r | |
142 | \r | |
143 | return NULL;\r | |
144 | }\r | |
145 | \r | |
146 | \r | |
147 | EFI_STATUS\r | |
148 | LibGetVariable (\r | |
149 | IN CHAR16 *VariableName,\r | |
150 | IN EFI_GUID *VendorGuid,\r | |
151 | OUT UINT32 *Attributes OPTIONAL,\r | |
152 | IN OUT UINTN *DataSize,\r | |
153 | OUT VOID *Data\r | |
154 | )\r | |
155 | {\r | |
156 | VARIABLE_ARRAY_ENTRY *Entry;\r | |
157 | VOID *InternalData;\r | |
158 | \r | |
159 | if (EfiAtRuntime () && (Attributes != NULL)) {\r | |
160 | if ((*Attributes & EFI_VARIABLE_RUNTIME_ACCESS) == 0) {\r | |
161 | return EFI_NOT_FOUND;\r | |
162 | }\r | |
163 | }\r | |
164 | \r | |
165 | Entry = GetVariableArrayEntry (VariableName, VendorGuid, &InternalData);\r | |
166 | if (Entry == NULL) {\r | |
167 | return EFI_NOT_FOUND;\r | |
168 | }\r | |
169 | \r | |
170 | if (*DataSize < Entry->DataSize) {\r | |
171 | *DataSize = Entry->DataSize;\r | |
172 | return EFI_BUFFER_TOO_SMALL;\r | |
173 | }\r | |
174 | \r | |
175 | *DataSize = Entry->DataSize;\r | |
176 | if (Attributes != NULL) {\r | |
177 | *Attributes = Entry->Attribute;\r | |
178 | }\r | |
179 | \r | |
180 | CopyMem (Data, InternalData, *DataSize);\r | |
181 | return EFI_SUCCESS;\r | |
182 | }\r | |
183 | \r | |
184 | \r | |
185 | EFI_STATUS\r | |
186 | LibGetNextVariableName (\r | |
187 | IN OUT UINTN *VariableNameSize,\r | |
188 | IN OUT CHAR16 *VariableName,\r | |
189 | IN OUT EFI_GUID *VendorGuid\r | |
190 | )\r | |
191 | {\r | |
192 | VARIABLE_ARRAY_ENTRY *Entry;\r | |
193 | VOID *InternalData;\r | |
194 | UINTN StringSize;\r | |
195 | BOOLEAN Done;\r | |
196 | \r | |
197 | for (Done = FALSE; !Done; ) {\r | |
198 | Entry = GetVariableArrayEntry (VariableName, VendorGuid, &InternalData);\r | |
199 | if (Entry == NULL) {\r | |
200 | return EFI_NOT_FOUND;\r | |
201 | }\r | |
202 | \r | |
203 | // If we are at runtime skip variables that do not have the Runitme attribute set.\r | |
204 | Done = (EfiAtRuntime () && ((Entry->Attribute & EFI_VARIABLE_RUNTIME_ACCESS) == 0)) ? FALSE : TRUE;\r | |
205 | } \r | |
206 | \r | |
207 | StringSize = StrSize ((CHAR16 *)(Entry + 1));\r | |
208 | Entry = (VARIABLE_ARRAY_ENTRY *)(((UINT8 *)Entry) + (StringSize + sizeof (VARIABLE_ARRAY_ENTRY) + Entry->DataSize));\r | |
209 | if (Entry >= mVariableArrayEnd) {\r | |
210 | return EFI_NOT_FOUND;\r | |
211 | }\r | |
212 | \r | |
213 | if (*VariableNameSize < StringSize) {\r | |
214 | *VariableNameSize = StringSize;\r | |
215 | return EFI_BUFFER_TOO_SMALL;\r | |
216 | }\r | |
217 | \r | |
218 | *VariableNameSize = StringSize;\r | |
219 | CopyMem (VariableName, (CHAR16 *)(Entry + 1), StringSize);\r | |
220 | CopyMem (VendorGuid, &Entry->VendorGuid, sizeof (EFI_GUID));\r | |
221 | return EFI_SUCCESS;\r | |
222 | }\r | |
223 | \r | |
224 | \r | |
225 | \r | |
226 | EFI_STATUS\r | |
227 | LibSetVariable (\r | |
228 | IN CHAR16 *VariableName,\r | |
229 | IN EFI_GUID *VendorGuid,\r | |
230 | IN UINT32 Attributes,\r | |
231 | IN UINTN DataSize,\r | |
232 | IN VOID *Data\r | |
233 | )\r | |
234 | {\r | |
235 | VARIABLE_ARRAY_ENTRY *Entry;\r | |
236 | VOID *InternalData;\r | |
237 | \r | |
238 | if (EfiAtRuntime () && ((Attributes & EFI_VARIABLE_RUNTIME_ACCESS) == 0)) {\r | |
239 | return EFI_NOT_FOUND;\r | |
240 | }\r | |
241 | \r | |
242 | Entry = GetVariableArrayEntry (VariableName, VendorGuid, &InternalData);\r | |
243 | if (Entry == NULL) {\r | |
244 | if (DataSize == 0) {\r | |
245 | return EFI_NOT_FOUND;\r | |
246 | }\r | |
247 | Entry = AddEntry (VariableName, VendorGuid, Attributes, DataSize, Data);\r | |
248 | return (Entry == NULL) ? EFI_OUT_OF_RESOURCES : EFI_SUCCESS;\r | |
249 | \r | |
250 | } else if (DataSize == 0) {\r | |
251 | // DataSize is zero so delete\r | |
252 | DeleteEntry (Entry);\r | |
253 | } else if (DataSize == Entry->DataSize) {\r | |
254 | // No change is size so just update the store\r | |
255 | Entry->Attribute |= Attributes;\r | |
256 | CopyMem (InternalData, Data, DataSize);\r | |
257 | } else {\r | |
258 | // Grow the entry by deleting and adding back. Don't lose previous Attributes\r | |
259 | Attributes |= Entry->Attribute;\r | |
260 | DeleteEntry (Entry);\r | |
261 | Entry = AddEntry (VariableName, VendorGuid, Attributes, DataSize, Data);\r | |
262 | return (Entry == NULL) ? EFI_OUT_OF_RESOURCES : EFI_SUCCESS;\r | |
263 | }\r | |
264 | }\r | |
265 | \r | |
266 | \r | |
267 | EFI_STATUS\r | |
268 | LibQueryVariableInfo (\r | |
269 | IN UINT32 Attributes,\r | |
270 | OUT UINT64 *MaximumVariableStorageSize,\r | |
271 | OUT UINT64 *RemainingVariableStorageSize,\r | |
272 | OUT UINT64 *MaximumVariableSize\r | |
273 | )\r | |
274 | {\r | |
275 | *MaximumVariableStorageSize = mMaximumVariableStorageSize;\r | |
276 | *RemainingVariableStorageSize = mRemainingVariableStorageSize;\r | |
277 | *MaximumVariableStorageSize = mRemainingVariableStorageSize;\r | |
278 | return EFI_SUCCESS;\r | |
279 | }\r | |
280 | \r | |
281 | \r | |
282 | VOID\r | |
283 | LibVariableVirtualAddressChangeEvent (VOID)\r | |
284 | {\r | |
285 | EfiConvertPointer (0, (VOID **)&mVariableArray);\r | |
286 | EfiConvertPointer (0, (VOID **)&mVariableArrayNextFree);\r | |
287 | EfiConvertPointer (0, (VOID **)&mVariableArrayEnd);\r | |
288 | }\r | |
289 | \r | |
290 | \r | |
291 | VOID\r | |
292 | LibVariableInitialize (VOID)\r | |
293 | {\r | |
294 | UINTN Size;\r | |
295 | \r | |
296 | Size = PcdGet32 (PcdEmbeddedMemVariableStoreSize);\r | |
297 | mVariableArray = mVariableArrayNextFree = (VARIABLE_ARRAY_ENTRY *)AllocateRuntimePool (Size);\r | |
298 | ASSERT (mVariableArray != NULL);\r | |
299 | \r | |
300 | mVariableArrayEnd = (VARIABLE_ARRAY_ENTRY *)(((UINT8 *)mVariableArray) + Size);\r | |
301 | \r | |
302 | mMaximumVariableStorageSize = Size - sizeof (VARIABLE_ARRAY_ENTRY);\r | |
303 | mRemainingVariableStorageSize = mMaximumVariableStorageSize;\r | |
304 | mMaximumVariableSize = mMaximumVariableStorageSize;\r | |
305 | }\r | |
306 | \r |