]>
Commit | Line | Data |
---|---|---|
59336178 | 1 | /** @file\r |
2 | \r | |
584d5652 HT |
3 | Copyright (c) 2007 - 2010, Intel Corporation. All rights reserved.<BR>\r |
4 | This program and the accompanying materials\r | |
59336178 | 5 | are licensed and made available under the terms and conditions of the BSD License\r |
6 | which accompanies this distribution. The full text of the license may be found at\r | |
7 | http://opensource.org/licenses/bsd-license.php\r | |
8 | \r | |
9 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
10 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
11 | \r | |
12 | Module Name:\r | |
13 | \r | |
14 | Expression.c\r | |
15 | \r | |
16 | Abstract:\r | |
17 | \r | |
18 | Expression evaluation.\r | |
19 | \r | |
20 | \r | |
21 | **/\r | |
22 | #include <PiDxe.h>\r | |
23 | #include <Library/BaseLib.h>\r | |
24 | #include <Library/BaseMemoryLib.h>\r | |
25 | #include <Library/DebugLib.h>\r | |
26 | #include <Library/MemoryAllocationLib.h>\r | |
27 | #include <Library/PrintLib.h>\r | |
28 | #include <Library/UefiBootServicesTableLib.h>\r | |
29 | #include <Protocol/UnicodeCollation.h>\r | |
30 | \r | |
31 | #include "UefiIfrParser.h"\r | |
59336178 | 32 | \r |
33 | //\r | |
34 | // Global stack used to evaluate boolean expresions\r | |
35 | //\r | |
36 | EFI_HII_VALUE *mOpCodeScopeStack = NULL;\r | |
37 | EFI_HII_VALUE *mOpCodeScopeStackEnd = NULL;\r | |
38 | EFI_HII_VALUE *mOpCodeScopeStackPointer = NULL;\r | |
39 | \r | |
40 | EFI_HII_VALUE *mExpressionEvaluationStack = NULL;\r | |
41 | EFI_HII_VALUE *mExpressionEvaluationStackEnd = NULL;\r | |
42 | EFI_HII_VALUE *mExpressionEvaluationStackPointer = NULL;\r | |
43 | \r | |
a9d85320 | 44 | #define EXPRESSION_STACK_SIZE_INCREMENT 0x100\r |
59336178 | 45 | \r |
46 | \r | |
47 | /**\r | |
48 | Grow size of the stack\r | |
49 | \r | |
50 | @param Stack On input: old stack; On output: new stack\r | |
51 | @param StackPtr On input: old stack pointer; On output: new stack\r | |
52 | pointer\r | |
26a76fbc | 53 | @param StackEnd On input: old stack end; On output: new stack end\r |
59336178 | 54 | \r |
55 | @retval EFI_SUCCESS Grow stack success.\r | |
56 | @retval EFI_OUT_OF_RESOURCES No enough memory for stack space.\r | |
57 | \r | |
58 | **/\r | |
59336178 | 59 | EFI_STATUS\r |
60 | GrowStack (\r | |
61 | IN OUT EFI_HII_VALUE **Stack,\r | |
62 | IN OUT EFI_HII_VALUE **StackPtr,\r | |
63 | IN OUT EFI_HII_VALUE **StackEnd\r | |
64 | )\r | |
65 | {\r | |
66 | UINTN Size;\r | |
67 | EFI_HII_VALUE *NewStack;\r | |
68 | \r | |
69 | Size = EXPRESSION_STACK_SIZE_INCREMENT;\r | |
70 | if (*StackPtr != NULL) {\r | |
71 | Size = Size + (*StackEnd - *Stack);\r | |
72 | }\r | |
73 | \r | |
74 | NewStack = AllocatePool (Size * sizeof (EFI_HII_VALUE));\r | |
75 | if (NewStack == NULL) {\r | |
76 | return EFI_OUT_OF_RESOURCES;\r | |
77 | }\r | |
78 | \r | |
79 | if (*StackPtr != NULL) {\r | |
80 | //\r | |
81 | // Copy from Old Stack to the New Stack\r | |
82 | //\r | |
83 | CopyMem (\r | |
84 | NewStack,\r | |
85 | *Stack,\r | |
86 | (*StackEnd - *Stack) * sizeof (EFI_HII_VALUE)\r | |
87 | );\r | |
88 | \r | |
89 | //\r | |
90 | // Free The Old Stack\r | |
91 | //\r | |
92 | gBS->FreePool (*Stack);\r | |
93 | }\r | |
94 | \r | |
95 | //\r | |
96 | // Make the Stack pointer point to the old data in the new stack\r | |
97 | //\r | |
98 | *StackPtr = NewStack + (*StackPtr - *Stack);\r | |
99 | *Stack = NewStack;\r | |
100 | *StackEnd = NewStack + Size;\r | |
101 | \r | |
102 | return EFI_SUCCESS;\r | |
103 | }\r | |
104 | \r | |
105 | \r | |
106 | /**\r | |
107 | Push an element onto the Boolean Stack\r | |
108 | \r | |
109 | @param Stack On input: old stack; On output: new stack\r | |
110 | @param StackPtr On input: old stack pointer; On output: new stack\r | |
111 | pointer\r | |
26a76fbc | 112 | @param StackEnd On input: old stack end; On output: new stack end\r |
59336178 | 113 | @param Data Data to push.\r |
114 | \r | |
115 | @retval EFI_SUCCESS Push stack success.\r | |
116 | \r | |
117 | **/\r | |
118 | EFI_STATUS\r | |
119 | PushStack (\r | |
120 | IN OUT EFI_HII_VALUE **Stack,\r | |
121 | IN OUT EFI_HII_VALUE **StackPtr,\r | |
122 | IN OUT EFI_HII_VALUE **StackEnd,\r | |
123 | IN EFI_HII_VALUE *Data\r | |
124 | )\r | |
125 | {\r | |
126 | EFI_STATUS Status;\r | |
127 | \r | |
128 | //\r | |
129 | // Check for a stack overflow condition\r | |
130 | //\r | |
131 | if (*StackPtr >= *StackEnd) {\r | |
132 | //\r | |
133 | // Grow the stack\r | |
134 | //\r | |
135 | Status = GrowStack (Stack, StackPtr, StackEnd);\r | |
136 | if (EFI_ERROR (Status)) {\r | |
137 | return Status;\r | |
138 | }\r | |
139 | }\r | |
140 | \r | |
141 | //\r | |
142 | // Push the item onto the stack\r | |
143 | //\r | |
144 | CopyMem (*StackPtr, Data, sizeof (EFI_HII_VALUE));\r | |
145 | *StackPtr = *StackPtr + 1;\r | |
146 | \r | |
147 | return EFI_SUCCESS;\r | |
148 | }\r | |
149 | \r | |
150 | \r | |
151 | /**\r | |
152 | Pop an element from the stack.\r | |
153 | \r | |
154 | @param Stack On input: old stack; On output: new stack\r | |
155 | @param StackPtr On input: old stack pointer; On output: new stack\r | |
156 | pointer\r | |
26a76fbc | 157 | @param StackEnd On input: old stack end; On output: new stack end\r |
59336178 | 158 | @param Data Data to pop.\r |
159 | \r | |
160 | @retval EFI_SUCCESS The value was popped onto the stack.\r | |
161 | @retval EFI_ACCESS_DENIED The pop operation underflowed the stack\r | |
162 | \r | |
163 | **/\r | |
164 | EFI_STATUS\r | |
165 | PopStack (\r | |
166 | IN OUT EFI_HII_VALUE **Stack,\r | |
167 | IN OUT EFI_HII_VALUE **StackPtr,\r | |
168 | IN OUT EFI_HII_VALUE **StackEnd,\r | |
169 | OUT EFI_HII_VALUE *Data\r | |
170 | )\r | |
171 | {\r | |
172 | //\r | |
173 | // Check for a stack underflow condition\r | |
174 | //\r | |
175 | if (*StackPtr == *Stack) {\r | |
176 | return EFI_ACCESS_DENIED;\r | |
177 | }\r | |
178 | \r | |
179 | //\r | |
180 | // Pop the item off the stack\r | |
181 | //\r | |
182 | *StackPtr = *StackPtr - 1;\r | |
183 | CopyMem (Data, *StackPtr, sizeof (EFI_HII_VALUE));\r | |
184 | return EFI_SUCCESS;\r | |
185 | }\r | |
186 | \r | |
59336178 | 187 | /**\r |
188 | Reset stack pointer to begin of the stack.\r | |
189 | \r | |
59336178 | 190 | **/\r |
191 | VOID\r | |
192 | ResetScopeStack (\r | |
193 | VOID\r | |
194 | )\r | |
195 | {\r | |
196 | mOpCodeScopeStackPointer = mOpCodeScopeStack;\r | |
197 | }\r | |
198 | \r | |
199 | \r | |
200 | /**\r | |
201 | Push an Operand onto the Stack\r | |
202 | \r | |
203 | @param Operand Operand to push.\r | |
204 | \r | |
205 | @retval EFI_SUCCESS The value was pushed onto the stack.\r | |
206 | @retval EFI_OUT_OF_RESOURCES There is not enough system memory to grow the\r | |
207 | stack.\r | |
208 | \r | |
209 | **/\r | |
210 | EFI_STATUS\r | |
211 | PushScope (\r | |
212 | IN UINT8 Operand\r | |
213 | )\r | |
214 | {\r | |
215 | EFI_HII_VALUE Data;\r | |
216 | \r | |
217 | Data.Type = EFI_IFR_TYPE_NUM_SIZE_8;\r | |
218 | Data.Value.u8 = Operand;\r | |
219 | \r | |
220 | return PushStack (\r | |
221 | &mOpCodeScopeStack,\r | |
222 | &mOpCodeScopeStackPointer,\r | |
223 | &mOpCodeScopeStackEnd,\r | |
224 | &Data\r | |
225 | );\r | |
226 | }\r | |
227 | \r | |
228 | \r | |
229 | /**\r | |
230 | Pop an Operand from the Stack\r | |
231 | \r | |
232 | @param Operand Operand to pop.\r | |
233 | \r | |
234 | @retval EFI_SUCCESS The value was pushed onto the stack.\r | |
235 | @retval EFI_OUT_OF_RESOURCES There is not enough system memory to grow the\r | |
236 | stack.\r | |
237 | \r | |
238 | **/\r | |
239 | EFI_STATUS\r | |
240 | PopScope (\r | |
241 | OUT UINT8 *Operand\r | |
242 | )\r | |
243 | {\r | |
244 | EFI_STATUS Status;\r | |
245 | EFI_HII_VALUE Data;\r | |
246 | \r | |
247 | Status = PopStack (\r | |
248 | &mOpCodeScopeStack,\r | |
249 | &mOpCodeScopeStackPointer,\r | |
250 | &mOpCodeScopeStackEnd,\r | |
251 | &Data\r | |
252 | );\r | |
253 | \r | |
254 | *Operand = Data.Value.u8;\r | |
255 | \r | |
256 | return Status;\r | |
257 | }\r | |
258 | \r | |
259 | \r | |
260 | /**\r | |
261 | Reset stack pointer to begin of the stack.\r | |
262 | \r | |
59336178 | 263 | **/\r |
264 | VOID\r | |
265 | ResetExpressionStack (\r | |
266 | VOID\r | |
267 | )\r | |
268 | {\r | |
269 | mExpressionEvaluationStackPointer = mExpressionEvaluationStack;\r | |
270 | }\r | |
271 | \r | |
272 | \r | |
273 | /**\r | |
274 | Push an Expression value onto the Stack\r | |
275 | \r | |
276 | @param Value Expression value to push.\r | |
277 | \r | |
278 | @retval EFI_SUCCESS The value was pushed onto the stack.\r | |
279 | @retval EFI_OUT_OF_RESOURCES There is not enough system memory to grow the\r | |
280 | stack.\r | |
281 | \r | |
282 | **/\r | |
283 | EFI_STATUS\r | |
284 | PushExpression (\r | |
285 | IN EFI_HII_VALUE *Value\r | |
286 | )\r | |
287 | {\r | |
288 | return PushStack (\r | |
289 | &mExpressionEvaluationStack,\r | |
290 | &mExpressionEvaluationStackPointer,\r | |
291 | &mExpressionEvaluationStackEnd,\r | |
292 | Value\r | |
293 | );\r | |
294 | }\r | |
295 | \r | |
296 | \r | |
297 | /**\r | |
298 | Pop an Expression value from the stack.\r | |
299 | \r | |
300 | @param Value Expression value to pop.\r | |
301 | \r | |
302 | @retval EFI_SUCCESS The value was popped onto the stack.\r | |
303 | @retval EFI_ACCESS_DENIED The pop operation underflowed the stack\r | |
304 | \r | |
305 | **/\r | |
306 | EFI_STATUS\r | |
307 | PopExpression (\r | |
308 | OUT EFI_HII_VALUE *Value\r | |
309 | )\r | |
310 | {\r | |
311 | return PopStack (\r | |
312 | &mExpressionEvaluationStack,\r | |
313 | &mExpressionEvaluationStackPointer,\r | |
314 | &mExpressionEvaluationStackEnd,\r | |
315 | Value\r | |
316 | );\r | |
317 | }\r | |
318 | \r | |
59336178 | 319 | /**\r |
320 | Zero extend integer/boolean/date/time to UINT64 for comparing.\r | |
321 | \r | |
322 | @param Value HII Value to be converted.\r | |
323 | \r | |
324 | @return None.\r | |
325 | \r | |
326 | **/\r | |
327 | VOID\r | |
328 | ExtendValueToU64 (\r | |
329 | IN EFI_HII_VALUE *Value\r | |
330 | )\r | |
331 | {\r | |
332 | UINT64 Temp;\r | |
333 | \r | |
334 | Temp = 0;\r | |
335 | switch (Value->Type) {\r | |
336 | case EFI_IFR_TYPE_NUM_SIZE_8:\r | |
337 | Temp = Value->Value.u8;\r | |
338 | break;\r | |
339 | \r | |
340 | case EFI_IFR_TYPE_NUM_SIZE_16:\r | |
341 | Temp = Value->Value.u16;\r | |
342 | break;\r | |
343 | \r | |
344 | case EFI_IFR_TYPE_NUM_SIZE_32:\r | |
345 | Temp = Value->Value.u32;\r | |
346 | break;\r | |
347 | \r | |
348 | case EFI_IFR_TYPE_BOOLEAN:\r | |
349 | Temp = Value->Value.b;\r | |
350 | break;\r | |
351 | \r | |
352 | case EFI_IFR_TYPE_TIME:\r | |
353 | Temp = Value->Value.u32 & 0xffffff;\r | |
354 | break;\r | |
355 | \r | |
356 | case EFI_IFR_TYPE_DATE:\r | |
357 | Temp = Value->Value.u32;\r | |
358 | break;\r | |
359 | \r | |
360 | default:\r | |
361 | return;\r | |
362 | }\r | |
363 | \r | |
364 | Value->Value.u64 = Temp;\r | |
365 | }\r |