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1 | /** @file\r |
2 | This module provides help function for finding ACPI table.\r | |
3 | \r | |
4 | Copyright (c) 2018, Intel Corporation. All rights reserved.<BR>\r | |
9344f092 | 5 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
af5e9521 SZ |
6 | \r |
7 | **/\r | |
8 | \r | |
9 | #include "UefiLibInternal.h"\r | |
10 | #include <IndustryStandard/Acpi.h>\r | |
11 | #include <Guid/Acpi.h>\r | |
12 | \r | |
13 | /**\r | |
14 | This function scans ACPI table in XSDT/RSDT.\r | |
15 | \r | |
16 | @param Sdt ACPI XSDT/RSDT.\r | |
17 | @param TablePointerSize Size of table pointer: 8(XSDT) or 4(RSDT).\r | |
18 | @param Signature ACPI table signature.\r | |
19 | @param PreviousTable Pointer to previous returned table to locate\r | |
20 | next table, or NULL to locate first table.\r | |
21 | @param PreviousTableLocated Pointer to the indicator about whether the\r | |
22 | previous returned table could be located, or\r | |
23 | NULL if PreviousTable is NULL.\r | |
24 | \r | |
25 | If PreviousTable is NULL and PreviousTableLocated is not NULL, then ASSERT().\r | |
26 | If PreviousTable is not NULL and PreviousTableLocated is NULL, then ASSERT().\r | |
27 | \r | |
28 | @return ACPI table or NULL if not found.\r | |
29 | \r | |
30 | **/\r | |
31 | EFI_ACPI_COMMON_HEADER *\r | |
32 | ScanTableInSDT (\r | |
33 | IN EFI_ACPI_DESCRIPTION_HEADER *Sdt,\r | |
34 | IN UINTN TablePointerSize,\r | |
35 | IN UINT32 Signature,\r | |
36 | IN EFI_ACPI_COMMON_HEADER *PreviousTable, OPTIONAL\r | |
37 | OUT BOOLEAN *PreviousTableLocated OPTIONAL\r | |
38 | )\r | |
39 | {\r | |
40 | UINTN Index;\r | |
41 | UINTN EntryCount;\r | |
42 | UINT64 EntryPtr;\r | |
43 | UINTN BasePtr;\r | |
44 | EFI_ACPI_COMMON_HEADER *Table;\r | |
45 | \r | |
46 | if (PreviousTableLocated != NULL) {\r | |
47 | ASSERT (PreviousTable != NULL);\r | |
48 | *PreviousTableLocated = FALSE;\r | |
49 | } else {\r | |
50 | ASSERT (PreviousTable == NULL);\r | |
51 | }\r | |
52 | \r | |
53 | if (Sdt == NULL) {\r | |
54 | return NULL;\r | |
55 | }\r | |
56 | \r | |
57 | EntryCount = (Sdt->Length - sizeof (EFI_ACPI_DESCRIPTION_HEADER)) / TablePointerSize;\r | |
58 | \r | |
59 | BasePtr = (UINTN)(Sdt + 1);\r | |
60 | for (Index = 0; Index < EntryCount; Index ++) {\r | |
61 | EntryPtr = 0;\r | |
62 | CopyMem (&EntryPtr, (VOID *)(BasePtr + Index * TablePointerSize), TablePointerSize);\r | |
63 | Table = (EFI_ACPI_COMMON_HEADER *)((UINTN)(EntryPtr));\r | |
e7ac09b9 | 64 | if ((Table != NULL) && (Table->Signature == Signature)) {\r |
af5e9521 SZ |
65 | if (PreviousTable != NULL) {\r |
66 | if (Table == PreviousTable) {\r | |
67 | *PreviousTableLocated = TRUE;\r | |
68 | } else if (*PreviousTableLocated) {\r | |
69 | //\r | |
70 | // Return next table.\r | |
71 | //\r | |
72 | return Table;\r | |
73 | }\r | |
74 | } else {\r | |
75 | //\r | |
76 | // Return first table.\r | |
77 | //\r | |
78 | return Table;\r | |
79 | }\r | |
80 | \r | |
81 | }\r | |
82 | }\r | |
83 | \r | |
84 | return NULL;\r | |
85 | }\r | |
86 | \r | |
87 | /**\r | |
88 | To locate FACS in FADT.\r | |
89 | \r | |
90 | @param Fadt FADT table pointer.\r | |
91 | \r | |
92 | @return FACS table pointer or NULL if not found.\r | |
93 | \r | |
94 | **/\r | |
95 | EFI_ACPI_COMMON_HEADER *\r | |
96 | LocateAcpiFacsFromFadt (\r | |
97 | IN EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE *Fadt\r | |
98 | )\r | |
99 | {\r | |
100 | EFI_ACPI_COMMON_HEADER *Facs;\r | |
101 | UINT64 Data64;\r | |
102 | \r | |
103 | if (Fadt == NULL) {\r | |
104 | return NULL;\r | |
105 | }\r | |
106 | \r | |
107 | if (Fadt->Header.Revision < EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE_REVISION) {\r | |
108 | Facs = (EFI_ACPI_COMMON_HEADER *)(UINTN)Fadt->FirmwareCtrl;\r | |
109 | } else {\r | |
110 | CopyMem (&Data64, &Fadt->XFirmwareCtrl, sizeof(UINT64));\r | |
111 | if (Data64 != 0) {\r | |
112 | Facs = (EFI_ACPI_COMMON_HEADER *)(UINTN)Data64;\r | |
113 | } else {\r | |
114 | Facs = (EFI_ACPI_COMMON_HEADER *)(UINTN)Fadt->FirmwareCtrl;\r | |
115 | }\r | |
116 | }\r | |
117 | return Facs;\r | |
118 | }\r | |
119 | \r | |
120 | /**\r | |
121 | To locate DSDT in FADT.\r | |
122 | \r | |
123 | @param Fadt FADT table pointer.\r | |
124 | \r | |
125 | @return DSDT table pointer or NULL if not found.\r | |
126 | \r | |
127 | **/\r | |
128 | EFI_ACPI_COMMON_HEADER *\r | |
129 | LocateAcpiDsdtFromFadt (\r | |
130 | IN EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE *Fadt\r | |
131 | )\r | |
132 | {\r | |
133 | EFI_ACPI_COMMON_HEADER *Dsdt;\r | |
134 | UINT64 Data64;\r | |
135 | \r | |
136 | if (Fadt == NULL) {\r | |
137 | return NULL;\r | |
138 | }\r | |
139 | \r | |
140 | if (Fadt->Header.Revision < EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE_REVISION) {\r | |
141 | Dsdt = (EFI_ACPI_COMMON_HEADER *)(UINTN)Fadt->Dsdt;\r | |
142 | } else {\r | |
143 | CopyMem (&Data64, &Fadt->XDsdt, sizeof(UINT64));\r | |
144 | if (Data64 != 0) {\r | |
145 | Dsdt = (EFI_ACPI_COMMON_HEADER *)(UINTN)Data64;\r | |
146 | } else {\r | |
147 | Dsdt = (EFI_ACPI_COMMON_HEADER *)(UINTN)Fadt->Dsdt;\r | |
148 | }\r | |
149 | }\r | |
150 | return Dsdt;\r | |
151 | }\r | |
152 | \r | |
153 | /**\r | |
154 | To locate ACPI table in ACPI ConfigurationTable.\r | |
155 | \r | |
156 | @param AcpiGuid The GUID used to get ACPI ConfigurationTable.\r | |
157 | @param Signature ACPI table signature.\r | |
158 | @param PreviousTable Pointer to previous returned table to locate\r | |
159 | next table, or NULL to locate first table.\r | |
160 | @param PreviousTableLocated Pointer to the indicator to return whether the\r | |
161 | previous returned table could be located or not,\r | |
162 | or NULL if PreviousTable is NULL.\r | |
163 | \r | |
164 | If PreviousTable is NULL and PreviousTableLocated is not NULL, then ASSERT().\r | |
165 | If PreviousTable is not NULL and PreviousTableLocated is NULL, then ASSERT().\r | |
166 | If AcpiGuid is NULL, then ASSERT().\r | |
167 | \r | |
168 | @return ACPI table or NULL if not found.\r | |
169 | \r | |
170 | **/\r | |
171 | EFI_ACPI_COMMON_HEADER *\r | |
172 | LocateAcpiTableInAcpiConfigurationTable (\r | |
173 | IN EFI_GUID *AcpiGuid,\r | |
174 | IN UINT32 Signature,\r | |
175 | IN EFI_ACPI_COMMON_HEADER *PreviousTable, OPTIONAL\r | |
176 | OUT BOOLEAN *PreviousTableLocated OPTIONAL\r | |
177 | )\r | |
178 | {\r | |
179 | EFI_STATUS Status;\r | |
180 | EFI_ACPI_COMMON_HEADER *Table;\r | |
181 | EFI_ACPI_2_0_ROOT_SYSTEM_DESCRIPTION_POINTER *Rsdp;\r | |
182 | EFI_ACPI_DESCRIPTION_HEADER *Rsdt;\r | |
183 | EFI_ACPI_DESCRIPTION_HEADER *Xsdt;\r | |
184 | EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE *Fadt;\r | |
185 | \r | |
186 | if (PreviousTableLocated != NULL) {\r | |
187 | ASSERT (PreviousTable != NULL);\r | |
188 | *PreviousTableLocated = FALSE;\r | |
189 | } else {\r | |
190 | ASSERT (PreviousTable == NULL);\r | |
191 | }\r | |
192 | \r | |
193 | Rsdp = NULL;\r | |
194 | //\r | |
195 | // Get ACPI ConfigurationTable (RSD_PTR)\r | |
196 | //\r | |
197 | Status = EfiGetSystemConfigurationTable(AcpiGuid, (VOID **)&Rsdp);\r | |
198 | if (EFI_ERROR (Status) || (Rsdp == NULL)) {\r | |
199 | return NULL;\r | |
200 | }\r | |
201 | \r | |
202 | Table = NULL;\r | |
203 | \r | |
204 | //\r | |
205 | // Search XSDT\r | |
206 | //\r | |
207 | if (Rsdp->Revision >= EFI_ACPI_2_0_ROOT_SYSTEM_DESCRIPTION_POINTER_REVISION) {\r | |
208 | Xsdt = (EFI_ACPI_DESCRIPTION_HEADER *)(UINTN) Rsdp->XsdtAddress;\r | |
209 | if (Signature == EFI_ACPI_2_0_DIFFERENTIATED_SYSTEM_DESCRIPTION_TABLE_SIGNATURE) {\r | |
210 | ASSERT (PreviousTable == NULL);\r | |
211 | //\r | |
212 | // It is to locate DSDT,\r | |
213 | // need to locate FADT first.\r | |
214 | //\r | |
215 | Fadt = (EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE *) ScanTableInSDT (\r | |
216 | Xsdt,\r | |
217 | sizeof (UINT64),\r | |
218 | EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE_SIGNATURE,\r | |
219 | NULL,\r | |
220 | NULL\r | |
221 | );\r | |
222 | Table = LocateAcpiDsdtFromFadt (Fadt);\r | |
223 | } else if (Signature == EFI_ACPI_2_0_FIRMWARE_ACPI_CONTROL_STRUCTURE_SIGNATURE) {\r | |
224 | ASSERT (PreviousTable == NULL);\r | |
225 | //\r | |
226 | // It is to locate FACS,\r | |
227 | // need to locate FADT first.\r | |
228 | //\r | |
229 | Fadt = (EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE *) ScanTableInSDT (\r | |
230 | Xsdt,\r | |
231 | sizeof (UINT64),\r | |
232 | EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE_SIGNATURE,\r | |
233 | NULL,\r | |
234 | NULL\r | |
235 | );\r | |
236 | Table = LocateAcpiFacsFromFadt (Fadt);\r | |
237 | } else {\r | |
238 | Table = ScanTableInSDT (\r | |
239 | Xsdt,\r | |
240 | sizeof (UINT64),\r | |
241 | Signature,\r | |
242 | PreviousTable,\r | |
243 | PreviousTableLocated\r | |
244 | );\r | |
245 | }\r | |
246 | }\r | |
247 | \r | |
248 | if (Table != NULL) {\r | |
249 | return Table;\r | |
250 | } else if ((PreviousTableLocated != NULL) &&\r | |
251 | *PreviousTableLocated) {\r | |
252 | //\r | |
253 | // PreviousTable could be located in XSDT,\r | |
254 | // but next table could not be located in XSDT.\r | |
255 | //\r | |
256 | return NULL;\r | |
257 | }\r | |
258 | \r | |
259 | //\r | |
260 | // Search RSDT\r | |
261 | //\r | |
262 | Rsdt = (EFI_ACPI_DESCRIPTION_HEADER *)(UINTN) Rsdp->RsdtAddress;\r | |
263 | if (Signature == EFI_ACPI_2_0_DIFFERENTIATED_SYSTEM_DESCRIPTION_TABLE_SIGNATURE) {\r | |
264 | ASSERT (PreviousTable == NULL);\r | |
265 | //\r | |
266 | // It is to locate DSDT,\r | |
267 | // need to locate FADT first.\r | |
268 | //\r | |
269 | Fadt = (EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE *) ScanTableInSDT (\r | |
270 | Rsdt,\r | |
271 | sizeof (UINT32),\r | |
272 | EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE_SIGNATURE,\r | |
273 | NULL,\r | |
274 | NULL\r | |
275 | );\r | |
276 | Table = LocateAcpiDsdtFromFadt (Fadt);\r | |
277 | } else if (Signature == EFI_ACPI_2_0_FIRMWARE_ACPI_CONTROL_STRUCTURE_SIGNATURE) {\r | |
278 | ASSERT (PreviousTable == NULL);\r | |
279 | //\r | |
280 | // It is to locate FACS,\r | |
281 | // need to locate FADT first.\r | |
282 | //\r | |
283 | Fadt = (EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE *) ScanTableInSDT (\r | |
284 | Rsdt,\r | |
285 | sizeof (UINT32),\r | |
286 | EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE_SIGNATURE,\r | |
287 | NULL,\r | |
288 | NULL\r | |
289 | );\r | |
290 | Table = LocateAcpiFacsFromFadt (Fadt);\r | |
291 | } else {\r | |
292 | Table = ScanTableInSDT (\r | |
293 | Rsdt,\r | |
294 | sizeof (UINT32),\r | |
295 | Signature,\r | |
296 | PreviousTable,\r | |
297 | PreviousTableLocated\r | |
298 | );\r | |
299 | }\r | |
300 | \r | |
301 | return Table;\r | |
302 | }\r | |
303 | \r | |
304 | /**\r | |
305 | This function locates next ACPI table in XSDT/RSDT based on Signature and\r | |
306 | previous returned Table.\r | |
307 | \r | |
308 | If PreviousTable is NULL:\r | |
309 | This function will locate the first ACPI table in XSDT/RSDT based on\r | |
310 | Signature in gEfiAcpi20TableGuid system configuration table first, and then\r | |
311 | gEfiAcpi10TableGuid system configuration table.\r | |
312 | This function will locate in XSDT first, and then RSDT.\r | |
313 | For DSDT, this function will locate XDsdt in FADT first, and then Dsdt in\r | |
314 | FADT.\r | |
315 | For FACS, this function will locate XFirmwareCtrl in FADT first, and then\r | |
316 | FirmwareCtrl in FADT.\r | |
317 | \r | |
318 | If PreviousTable is not NULL:\r | |
319 | 1. If it could be located in XSDT in gEfiAcpi20TableGuid system configuration\r | |
320 | table, then this function will just locate next table in XSDT in\r | |
321 | gEfiAcpi20TableGuid system configuration table.\r | |
322 | 2. If it could be located in RSDT in gEfiAcpi20TableGuid system configuration\r | |
323 | table, then this function will just locate next table in RSDT in\r | |
324 | gEfiAcpi20TableGuid system configuration table.\r | |
325 | 3. If it could be located in RSDT in gEfiAcpi10TableGuid system configuration\r | |
326 | table, then this function will just locate next table in RSDT in\r | |
327 | gEfiAcpi10TableGuid system configuration table.\r | |
328 | \r | |
329 | It's not supported that PreviousTable is not NULL but PreviousTable->Signature\r | |
330 | is not same with Signature, NULL will be returned.\r | |
331 | \r | |
332 | @param Signature ACPI table signature.\r | |
333 | @param PreviousTable Pointer to previous returned table to locate next\r | |
334 | table, or NULL to locate first table.\r | |
335 | \r | |
336 | @return Next ACPI table or NULL if not found.\r | |
337 | \r | |
338 | **/\r | |
339 | EFI_ACPI_COMMON_HEADER *\r | |
340 | EFIAPI\r | |
341 | EfiLocateNextAcpiTable (\r | |
342 | IN UINT32 Signature,\r | |
343 | IN EFI_ACPI_COMMON_HEADER *PreviousTable OPTIONAL\r | |
344 | )\r | |
345 | {\r | |
346 | EFI_ACPI_COMMON_HEADER *Table;\r | |
347 | BOOLEAN TempPreviousTableLocated;\r | |
348 | BOOLEAN *PreviousTableLocated;\r | |
349 | \r | |
350 | if (PreviousTable != NULL) {\r | |
351 | if (PreviousTable->Signature != Signature) {\r | |
352 | //\r | |
353 | // PreviousTable->Signature is not same with Signature.\r | |
354 | //\r | |
355 | return NULL;\r | |
356 | } else if ((Signature == EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE_SIGNATURE) ||\r | |
357 | (Signature == EFI_ACPI_2_0_DIFFERENTIATED_SYSTEM_DESCRIPTION_TABLE_SIGNATURE) ||\r | |
358 | (Signature == EFI_ACPI_2_0_FIRMWARE_ACPI_CONTROL_STRUCTURE_SIGNATURE)) {\r | |
359 | //\r | |
360 | // There is only one FADT/DSDT/FACS table,\r | |
361 | // so don't try to locate next one.\r | |
362 | //\r | |
363 | return NULL;\r | |
364 | }\r | |
365 | \r | |
366 | PreviousTableLocated = &TempPreviousTableLocated;\r | |
367 | *PreviousTableLocated = FALSE;\r | |
368 | } else {\r | |
369 | PreviousTableLocated = NULL;\r | |
370 | }\r | |
371 | \r | |
372 | Table = LocateAcpiTableInAcpiConfigurationTable (\r | |
373 | &gEfiAcpi20TableGuid,\r | |
374 | Signature,\r | |
375 | PreviousTable,\r | |
376 | PreviousTableLocated\r | |
377 | );\r | |
378 | if (Table != NULL) {\r | |
379 | return Table;\r | |
380 | } else if ((PreviousTableLocated != NULL) &&\r | |
381 | *PreviousTableLocated) {\r | |
382 | //\r | |
383 | // PreviousTable could be located in gEfiAcpi20TableGuid system\r | |
384 | // configuration table, but next table could not be located in\r | |
385 | // gEfiAcpi20TableGuid system configuration table.\r | |
386 | //\r | |
387 | return NULL;\r | |
388 | }\r | |
389 | \r | |
390 | return LocateAcpiTableInAcpiConfigurationTable (\r | |
391 | &gEfiAcpi10TableGuid,\r | |
392 | Signature,\r | |
393 | PreviousTable,\r | |
394 | PreviousTableLocated\r | |
395 | );\r | |
396 | }\r | |
397 | \r | |
398 | /**\r | |
399 | This function locates first ACPI table in XSDT/RSDT based on Signature.\r | |
400 | \r | |
401 | This function will locate the first ACPI table in XSDT/RSDT based on\r | |
402 | Signature in gEfiAcpi20TableGuid system configuration table first, and then\r | |
403 | gEfiAcpi10TableGuid system configuration table.\r | |
404 | This function will locate in XSDT first, and then RSDT.\r | |
405 | For DSDT, this function will locate XDsdt in FADT first, and then Dsdt in\r | |
406 | FADT.\r | |
407 | For FACS, this function will locate XFirmwareCtrl in FADT first, and then\r | |
408 | FirmwareCtrl in FADT.\r | |
409 | \r | |
410 | @param Signature ACPI table signature.\r | |
411 | \r | |
412 | @return First ACPI table or NULL if not found.\r | |
413 | \r | |
414 | **/\r | |
415 | EFI_ACPI_COMMON_HEADER *\r | |
416 | EFIAPI\r | |
417 | EfiLocateFirstAcpiTable (\r | |
418 | IN UINT32 Signature\r | |
419 | )\r | |
420 | {\r | |
421 | return EfiLocateNextAcpiTable (Signature, NULL);\r | |
422 | }\r |