1 /******************************************************************************
2 *
3 * Module Name: tbxfload - Table load/unload external interfaces
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2014, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44 #define EXPORT_ACPI_INTERFACES
45
46 #include "acpi.h"
47 #include "accommon.h"
48 #include "acnamesp.h"
49 #include "actables.h"
50
51 #define _COMPONENT ACPI_TABLES
52 ACPI_MODULE_NAME ("tbxfload")
53
54 /* Local prototypes */
55
56 static ACPI_STATUS
57 AcpiTbLoadNamespace (
58 void);
59
60
61 /*******************************************************************************
62 *
63 * FUNCTION: AcpiLoadTables
64 *
65 * PARAMETERS: None
66 *
67 * RETURN: Status
68 *
69 * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
70 *
71 ******************************************************************************/
72
73 ACPI_STATUS
AcpiLoadTables(void)74 AcpiLoadTables (
75 void)
76 {
77 ACPI_STATUS Status;
78
79
80 ACPI_FUNCTION_TRACE (AcpiLoadTables);
81
82
83 /* Load the namespace from the tables */
84
85 Status = AcpiTbLoadNamespace ();
86 if (ACPI_FAILURE (Status))
87 {
88 ACPI_EXCEPTION ((AE_INFO, Status,
89 "While loading namespace from ACPI tables"));
90 }
91
92 return_ACPI_STATUS (Status);
93 }
94
ACPI_EXPORT_SYMBOL_INIT(AcpiLoadTables)95 ACPI_EXPORT_SYMBOL_INIT (AcpiLoadTables)
96
97
98 /*******************************************************************************
99 *
100 * FUNCTION: AcpiTbLoadNamespace
101 *
102 * PARAMETERS: None
103 *
104 * RETURN: Status
105 *
106 * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
107 * the RSDT/XSDT.
108 *
109 ******************************************************************************/
110
111 static ACPI_STATUS
112 AcpiTbLoadNamespace (
113 void)
114 {
115 ACPI_STATUS Status;
116 UINT32 i;
117 ACPI_TABLE_HEADER *NewDsdt;
118
119
120 ACPI_FUNCTION_TRACE (TbLoadNamespace);
121
122
123 (void) AcpiUtAcquireMutex (ACPI_MTX_TABLES);
124
125 /*
126 * Load the namespace. The DSDT is required, but any SSDT and
127 * PSDT tables are optional. Verify the DSDT.
128 */
129 if (!AcpiGbl_RootTableList.CurrentTableCount ||
130 !ACPI_COMPARE_NAME (
131 &(AcpiGbl_RootTableList.Tables[ACPI_TABLE_INDEX_DSDT].Signature),
132 ACPI_SIG_DSDT) ||
133 ACPI_FAILURE (AcpiTbValidateTable (
134 &AcpiGbl_RootTableList.Tables[ACPI_TABLE_INDEX_DSDT])))
135 {
136 Status = AE_NO_ACPI_TABLES;
137 goto UnlockAndExit;
138 }
139
140 /*
141 * Save the DSDT pointer for simple access. This is the mapped memory
142 * address. We must take care here because the address of the .Tables
143 * array can change dynamically as tables are loaded at run-time. Note:
144 * .Pointer field is not validated until after call to AcpiTbValidateTable.
145 */
146 AcpiGbl_DSDT = AcpiGbl_RootTableList.Tables[ACPI_TABLE_INDEX_DSDT].Pointer;
147
148 /*
149 * Optionally copy the entire DSDT to local memory (instead of simply
150 * mapping it.) There are some BIOSs that corrupt or replace the original
151 * DSDT, creating the need for this option. Default is FALSE, do not copy
152 * the DSDT.
153 */
154 if (AcpiGbl_CopyDsdtLocally)
155 {
156 NewDsdt = AcpiTbCopyDsdt (ACPI_TABLE_INDEX_DSDT);
157 if (NewDsdt)
158 {
159 AcpiGbl_DSDT = NewDsdt;
160 }
161 }
162
163 /*
164 * Save the original DSDT header for detection of table corruption
165 * and/or replacement of the DSDT from outside the OS.
166 */
167 ACPI_MEMCPY (&AcpiGbl_OriginalDsdtHeader, AcpiGbl_DSDT,
168 sizeof (ACPI_TABLE_HEADER));
169
170 (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);
171
172 /* Load and parse tables */
173
174 Status = AcpiNsLoadTable (ACPI_TABLE_INDEX_DSDT, AcpiGbl_RootNode);
175 if (ACPI_FAILURE (Status))
176 {
177 return_ACPI_STATUS (Status);
178 }
179
180 /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */
181
182 (void) AcpiUtAcquireMutex (ACPI_MTX_TABLES);
183 for (i = 0; i < AcpiGbl_RootTableList.CurrentTableCount; ++i)
184 {
185 if ((!ACPI_COMPARE_NAME (&(AcpiGbl_RootTableList.Tables[i].Signature),
186 ACPI_SIG_SSDT) &&
187 !ACPI_COMPARE_NAME (&(AcpiGbl_RootTableList.Tables[i].Signature),
188 ACPI_SIG_PSDT)) ||
189 ACPI_FAILURE (AcpiTbValidateTable (
190 &AcpiGbl_RootTableList.Tables[i])))
191 {
192 continue;
193 }
194
195 /* Ignore errors while loading tables, get as many as possible */
196
197 (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);
198 (void) AcpiNsLoadTable (i, AcpiGbl_RootNode);
199 (void) AcpiUtAcquireMutex (ACPI_MTX_TABLES);
200 }
201
202 ACPI_INFO ((AE_INFO, "All ACPI Tables successfully acquired"));
203
204 UnlockAndExit:
205 (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);
206 return_ACPI_STATUS (Status);
207 }
208
209
210 /*******************************************************************************
211 *
212 * FUNCTION: AcpiInstallTable
213 *
214 * PARAMETERS: Address - Address of the ACPI table to be installed.
215 * Physical - Whether the address is a physical table
216 * address or not
217 *
218 * RETURN: Status
219 *
220 * DESCRIPTION: Dynamically install an ACPI table.
221 * Note: This function should only be invoked after
222 * AcpiInitializeTables() and before AcpiLoadTables().
223 *
224 ******************************************************************************/
225
226 ACPI_STATUS
AcpiInstallTable(ACPI_PHYSICAL_ADDRESS Address,BOOLEAN Physical)227 AcpiInstallTable (
228 ACPI_PHYSICAL_ADDRESS Address,
229 BOOLEAN Physical)
230 {
231 ACPI_STATUS Status;
232 UINT8 Flags;
233 UINT32 TableIndex;
234
235
236 ACPI_FUNCTION_TRACE (AcpiInstallTable);
237
238
239 if (Physical)
240 {
241 Flags = ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL;
242 }
243 else
244 {
245 Flags = ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL;
246 }
247
248 Status = AcpiTbInstallStandardTable (Address, Flags,
249 FALSE, FALSE, &TableIndex);
250
251 return_ACPI_STATUS (Status);
252 }
253
ACPI_EXPORT_SYMBOL_INIT(AcpiInstallTable)254 ACPI_EXPORT_SYMBOL_INIT (AcpiInstallTable)
255
256
257 /*******************************************************************************
258 *
259 * FUNCTION: AcpiLoadTable
260 *
261 * PARAMETERS: Table - Pointer to a buffer containing the ACPI
262 * table to be loaded.
263 *
264 * RETURN: Status
265 *
266 * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must
267 * be a valid ACPI table with a valid ACPI table header.
268 * Note1: Mainly intended to support hotplug addition of SSDTs.
269 * Note2: Does not copy the incoming table. User is responsible
270 * to ensure that the table is not deleted or unmapped.
271 *
272 ******************************************************************************/
273
274 ACPI_STATUS
275 AcpiLoadTable (
276 ACPI_TABLE_HEADER *Table)
277 {
278 ACPI_STATUS Status;
279 UINT32 TableIndex;
280
281
282 ACPI_FUNCTION_TRACE (AcpiLoadTable);
283
284
285 /* Parameter validation */
286
287 if (!Table)
288 {
289 return_ACPI_STATUS (AE_BAD_PARAMETER);
290 }
291
292 /* Must acquire the interpreter lock during this operation */
293
294 Status = AcpiUtAcquireMutex (ACPI_MTX_INTERPRETER);
295 if (ACPI_FAILURE (Status))
296 {
297 return_ACPI_STATUS (Status);
298 }
299
300 /* Install the table and load it into the namespace */
301
302 ACPI_INFO ((AE_INFO, "Host-directed Dynamic ACPI Table Load:"));
303 (void) AcpiUtAcquireMutex (ACPI_MTX_TABLES);
304
305 Status = AcpiTbInstallStandardTable (ACPI_PTR_TO_PHYSADDR (Table),
306 ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL, TRUE, FALSE,
307 &TableIndex);
308
309 (void) AcpiUtReleaseMutex (ACPI_MTX_TABLES);
310 if (ACPI_FAILURE (Status))
311 {
312 goto UnlockAndExit;
313 }
314
315 /*
316 * Note: Now table is "INSTALLED", it must be validated before
317 * using.
318 */
319 Status = AcpiTbValidateTable (&AcpiGbl_RootTableList.Tables[TableIndex]);
320 if (ACPI_FAILURE (Status))
321 {
322 goto UnlockAndExit;
323 }
324
325 Status = AcpiNsLoadTable (TableIndex, AcpiGbl_RootNode);
326
327 /* Invoke table handler if present */
328
329 if (AcpiGbl_TableHandler)
330 {
331 (void) AcpiGbl_TableHandler (ACPI_TABLE_EVENT_LOAD, Table,
332 AcpiGbl_TableHandlerContext);
333 }
334
335 UnlockAndExit:
336 (void) AcpiUtReleaseMutex (ACPI_MTX_INTERPRETER);
337 return_ACPI_STATUS (Status);
338 }
339
ACPI_EXPORT_SYMBOL(AcpiLoadTable)340 ACPI_EXPORT_SYMBOL (AcpiLoadTable)
341
342
343 /*******************************************************************************
344 *
345 * FUNCTION: AcpiUnloadParentTable
346 *
347 * PARAMETERS: Object - Handle to any namespace object owned by
348 * the table to be unloaded
349 *
350 * RETURN: Status
351 *
352 * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads
353 * the table and deletes all namespace objects associated with
354 * that table. Unloading of the DSDT is not allowed.
355 * Note: Mainly intended to support hotplug removal of SSDTs.
356 *
357 ******************************************************************************/
358
359 ACPI_STATUS
360 AcpiUnloadParentTable (
361 ACPI_HANDLE Object)
362 {
363 ACPI_NAMESPACE_NODE *Node = ACPI_CAST_PTR (ACPI_NAMESPACE_NODE, Object);
364 ACPI_STATUS Status = AE_NOT_EXIST;
365 ACPI_OWNER_ID OwnerId;
366 UINT32 i;
367
368
369 ACPI_FUNCTION_TRACE (AcpiUnloadParentTable);
370
371
372 /* Parameter validation */
373
374 if (!Object)
375 {
376 return_ACPI_STATUS (AE_BAD_PARAMETER);
377 }
378
379 /*
380 * The node OwnerId is currently the same as the parent table ID.
381 * However, this could change in the future.
382 */
383 OwnerId = Node->OwnerId;
384 if (!OwnerId)
385 {
386 /* OwnerId==0 means DSDT is the owner. DSDT cannot be unloaded */
387
388 return_ACPI_STATUS (AE_TYPE);
389 }
390
391 /* Must acquire the interpreter lock during this operation */
392
393 Status = AcpiUtAcquireMutex (ACPI_MTX_INTERPRETER);
394 if (ACPI_FAILURE (Status))
395 {
396 return_ACPI_STATUS (Status);
397 }
398
399 /* Find the table in the global table list */
400
401 for (i = 0; i < AcpiGbl_RootTableList.CurrentTableCount; i++)
402 {
403 if (OwnerId != AcpiGbl_RootTableList.Tables[i].OwnerId)
404 {
405 continue;
406 }
407
408 /*
409 * Allow unload of SSDT and OEMx tables only. Do not allow unload
410 * of the DSDT. No other types of tables should get here, since
411 * only these types can contain AML and thus are the only types
412 * that can create namespace objects.
413 */
414 if (ACPI_COMPARE_NAME (
415 AcpiGbl_RootTableList.Tables[i].Signature.Ascii,
416 ACPI_SIG_DSDT))
417 {
418 Status = AE_TYPE;
419 break;
420 }
421
422 /* Ensure the table is actually loaded */
423
424 if (!AcpiTbIsTableLoaded (i))
425 {
426 Status = AE_NOT_EXIST;
427 break;
428 }
429
430 /* Invoke table handler if present */
431
432 if (AcpiGbl_TableHandler)
433 {
434 (void) AcpiGbl_TableHandler (ACPI_TABLE_EVENT_UNLOAD,
435 AcpiGbl_RootTableList.Tables[i].Pointer,
436 AcpiGbl_TableHandlerContext);
437 }
438
439 /*
440 * Delete all namespace objects owned by this table. Note that
441 * these objects can appear anywhere in the namespace by virtue
442 * of the AML "Scope" operator. Thus, we need to track ownership
443 * by an ID, not simply a position within the hierarchy.
444 */
445 Status = AcpiTbDeleteNamespaceByOwner (i);
446 if (ACPI_FAILURE (Status))
447 {
448 break;
449 }
450
451 Status = AcpiTbReleaseOwnerId (i);
452 AcpiTbSetTableLoadedFlag (i, FALSE);
453 break;
454 }
455
456 (void) AcpiUtReleaseMutex (ACPI_MTX_INTERPRETER);
457 return_ACPI_STATUS (Status);
458 }
459
460 ACPI_EXPORT_SYMBOL (AcpiUnloadParentTable)
461