1 /******************************************************************************
2 *
3 * Module Name: tbutils - ACPI Table utilities
4 *
5 *****************************************************************************/
6
7 /******************************************************************************
8 *
9 * 1. Copyright Notice
10 *
11 * Some or all of this work - Copyright (c) 1999 - 2018, Intel Corp.
12 * All rights reserved.
13 *
14 * 2. License
15 *
16 * 2.1. This is your license from Intel Corp. under its intellectual property
17 * rights. You may have additional license terms from the party that provided
18 * you this software, covering your right to use that party's intellectual
19 * property rights.
20 *
21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
22 * copy of the source code appearing in this file ("Covered Code") an
23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
24 * base code distributed originally by Intel ("Original Intel Code") to copy,
25 * make derivatives, distribute, use and display any portion of the Covered
26 * Code in any form, with the right to sublicense such rights; and
27 *
28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
29 * license (with the right to sublicense), under only those claims of Intel
30 * patents that are infringed by the Original Intel Code, to make, use, sell,
31 * offer to sell, and import the Covered Code and derivative works thereof
32 * solely to the minimum extent necessary to exercise the above copyright
33 * license, and in no event shall the patent license extend to any additions
34 * to or modifications of the Original Intel Code. No other license or right
35 * is granted directly or by implication, estoppel or otherwise;
36 *
37 * The above copyright and patent license is granted only if the following
38 * conditions are met:
39 *
40 * 3. Conditions
41 *
42 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
43 * Redistribution of source code of any substantial portion of the Covered
44 * Code or modification with rights to further distribute source must include
45 * the above Copyright Notice, the above License, this list of Conditions,
46 * and the following Disclaimer and Export Compliance provision. In addition,
47 * Licensee must cause all Covered Code to which Licensee contributes to
48 * contain a file documenting the changes Licensee made to create that Covered
49 * Code and the date of any change. Licensee must include in that file the
50 * documentation of any changes made by any predecessor Licensee. Licensee
51 * must include a prominent statement that the modification is derived,
52 * directly or indirectly, from Original Intel Code.
53 *
54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
55 * Redistribution of source code of any substantial portion of the Covered
56 * Code or modification without rights to further distribute source must
57 * include the following Disclaimer and Export Compliance provision in the
58 * documentation and/or other materials provided with distribution. In
59 * addition, Licensee may not authorize further sublicense of source of any
60 * portion of the Covered Code, and must include terms to the effect that the
61 * license from Licensee to its licensee is limited to the intellectual
62 * property embodied in the software Licensee provides to its licensee, and
63 * not to intellectual property embodied in modifications its licensee may
64 * make.
65 *
66 * 3.3. Redistribution of Executable. Redistribution in executable form of any
67 * substantial portion of the Covered Code or modification must reproduce the
68 * above Copyright Notice, and the following Disclaimer and Export Compliance
69 * provision in the documentation and/or other materials provided with the
70 * distribution.
71 *
72 * 3.4. Intel retains all right, title, and interest in and to the Original
73 * Intel Code.
74 *
75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
76 * Intel shall be used in advertising or otherwise to promote the sale, use or
77 * other dealings in products derived from or relating to the Covered Code
78 * without prior written authorization from Intel.
79 *
80 * 4. Disclaimer and Export Compliance
81 *
82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
88 * PARTICULAR PURPOSE.
89 *
90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
97 * LIMITED REMEDY.
98 *
99 * 4.3. Licensee shall not export, either directly or indirectly, any of this
100 * software or system incorporating such software without first obtaining any
101 * required license or other approval from the U. S. Department of Commerce or
102 * any other agency or department of the United States Government. In the
103 * event Licensee exports any such software from the United States or
104 * re-exports any such software from a foreign destination, Licensee shall
105 * ensure that the distribution and export/re-export of the software is in
106 * compliance with all laws, regulations, orders, or other restrictions of the
107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
108 * any of its subsidiaries will export/re-export any technical data, process,
109 * software, or service, directly or indirectly, to any country for which the
110 * United States government or any agency thereof requires an export license,
111 * other governmental approval, or letter of assurance, without first obtaining
112 * such license, approval or letter.
113 *
114 *****************************************************************************
115 *
116 * Alternatively, you may choose to be licensed under the terms of the
117 * following license:
118 *
119 * Redistribution and use in source and binary forms, with or without
120 * modification, are permitted provided that the following conditions
121 * are met:
122 * 1. Redistributions of source code must retain the above copyright
123 * notice, this list of conditions, and the following disclaimer,
124 * without modification.
125 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
126 * substantially similar to the "NO WARRANTY" disclaimer below
127 * ("Disclaimer") and any redistribution must be conditioned upon
128 * including a substantially similar Disclaimer requirement for further
129 * binary redistribution.
130 * 3. Neither the names of the above-listed copyright holders nor the names
131 * of any contributors may be used to endorse or promote products derived
132 * from this software without specific prior written permission.
133 *
134 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
135 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
136 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
137 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
138 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
139 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
140 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
141 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
142 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
143 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
144 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
145 *
146 * Alternatively, you may choose to be licensed under the terms of the
147 * GNU General Public License ("GPL") version 2 as published by the Free
148 * Software Foundation.
149 *
150 *****************************************************************************/
151
152 #include "acpi.h"
153 #include "accommon.h"
154 #include "actables.h"
155
156 #define _COMPONENT ACPI_TABLES
157 ACPI_MODULE_NAME ("tbutils")
158
159
160 /* Local prototypes */
161
162 static ACPI_PHYSICAL_ADDRESS
163 AcpiTbGetRootTableEntry (
164 UINT8 *TableEntry,
165 UINT32 TableEntrySize);
166
167
168 #if (!ACPI_REDUCED_HARDWARE)
169 /*******************************************************************************
170 *
171 * FUNCTION: AcpiTbInitializeFacs
172 *
173 * PARAMETERS: None
174 *
175 * RETURN: Status
176 *
177 * DESCRIPTION: Create a permanent mapping for the FADT and save it in a global
178 * for accessing the Global Lock and Firmware Waking Vector
179 *
180 ******************************************************************************/
181
182 ACPI_STATUS
AcpiTbInitializeFacs(void)183 AcpiTbInitializeFacs (
184 void)
185 {
186 ACPI_TABLE_FACS *Facs;
187
188
189 /* If Hardware Reduced flag is set, there is no FACS */
190
191 if (AcpiGbl_ReducedHardware)
192 {
193 AcpiGbl_FACS = NULL;
194 return (AE_OK);
195 }
196 else if (AcpiGbl_FADT.XFacs &&
197 (!AcpiGbl_FADT.Facs || !AcpiGbl_Use32BitFacsAddresses))
198 {
199 (void) AcpiGetTableByIndex (AcpiGbl_XFacsIndex,
200 ACPI_CAST_INDIRECT_PTR (ACPI_TABLE_HEADER, &Facs));
201 AcpiGbl_FACS = Facs;
202 }
203 else if (AcpiGbl_FADT.Facs)
204 {
205 (void) AcpiGetTableByIndex (AcpiGbl_FacsIndex,
206 ACPI_CAST_INDIRECT_PTR (ACPI_TABLE_HEADER, &Facs));
207 AcpiGbl_FACS = Facs;
208 }
209
210 /* If there is no FACS, just continue. There was already an error msg */
211
212 return (AE_OK);
213 }
214 #endif /* !ACPI_REDUCED_HARDWARE */
215
216
217 /*******************************************************************************
218 *
219 * FUNCTION: AcpiTbCheckDsdtHeader
220 *
221 * PARAMETERS: None
222 *
223 * RETURN: None
224 *
225 * DESCRIPTION: Quick compare to check validity of the DSDT. This will detect
226 * if the DSDT has been replaced from outside the OS and/or if
227 * the DSDT header has been corrupted.
228 *
229 ******************************************************************************/
230
231 void
AcpiTbCheckDsdtHeader(void)232 AcpiTbCheckDsdtHeader (
233 void)
234 {
235
236 /* Compare original length and checksum to current values */
237
238 if (AcpiGbl_OriginalDsdtHeader.Length != AcpiGbl_DSDT->Length ||
239 AcpiGbl_OriginalDsdtHeader.Checksum != AcpiGbl_DSDT->Checksum)
240 {
241 ACPI_BIOS_ERROR ((AE_INFO,
242 "The DSDT has been corrupted or replaced - "
243 "old, new headers below"));
244
245 AcpiTbPrintTableHeader (0, &AcpiGbl_OriginalDsdtHeader);
246 AcpiTbPrintTableHeader (0, AcpiGbl_DSDT);
247
248 /* Disable further error messages */
249
250 AcpiGbl_OriginalDsdtHeader.Length = AcpiGbl_DSDT->Length;
251 AcpiGbl_OriginalDsdtHeader.Checksum = AcpiGbl_DSDT->Checksum;
252 }
253 }
254
255
256 /*******************************************************************************
257 *
258 * FUNCTION: AcpiTbCopyDsdt
259 *
260 * PARAMETERS: TableIndex - Index of installed table to copy
261 *
262 * RETURN: The copied DSDT
263 *
264 * DESCRIPTION: Implements a subsystem option to copy the DSDT to local memory.
265 * Some very bad BIOSs are known to either corrupt the DSDT or
266 * install a new, bad DSDT. This copy works around the problem.
267 *
268 ******************************************************************************/
269
270 ACPI_TABLE_HEADER *
AcpiTbCopyDsdt(UINT32 TableIndex)271 AcpiTbCopyDsdt (
272 UINT32 TableIndex)
273 {
274 ACPI_TABLE_HEADER *NewTable;
275 ACPI_TABLE_DESC *TableDesc;
276
277
278 TableDesc = &AcpiGbl_RootTableList.Tables[TableIndex];
279
280 NewTable = ACPI_ALLOCATE (TableDesc->Length);
281 if (!NewTable)
282 {
283 ACPI_ERROR ((AE_INFO, "Could not copy DSDT of length 0x%X",
284 TableDesc->Length));
285 return (NULL);
286 }
287
288 memcpy (NewTable, TableDesc->Pointer, TableDesc->Length);
289 AcpiTbUninstallTable (TableDesc);
290
291 AcpiTbInitTableDescriptor (
292 &AcpiGbl_RootTableList.Tables[AcpiGbl_DsdtIndex],
293 ACPI_PTR_TO_PHYSADDR (NewTable),
294 ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL, NewTable);
295
296 ACPI_INFO ((
297 "Forced DSDT copy: length 0x%05X copied locally, original unmapped",
298 NewTable->Length));
299
300 return (NewTable);
301 }
302
303
304 /*******************************************************************************
305 *
306 * FUNCTION: AcpiTbGetRootTableEntry
307 *
308 * PARAMETERS: TableEntry - Pointer to the RSDT/XSDT table entry
309 * TableEntrySize - sizeof 32 or 64 (RSDT or XSDT)
310 *
311 * RETURN: Physical address extracted from the root table
312 *
313 * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on
314 * both 32-bit and 64-bit platforms
315 *
316 * NOTE: ACPI_PHYSICAL_ADDRESS is 32-bit on 32-bit platforms, 64-bit on
317 * 64-bit platforms.
318 *
319 ******************************************************************************/
320
321 static ACPI_PHYSICAL_ADDRESS
AcpiTbGetRootTableEntry(UINT8 * TableEntry,UINT32 TableEntrySize)322 AcpiTbGetRootTableEntry (
323 UINT8 *TableEntry,
324 UINT32 TableEntrySize)
325 {
326 UINT64 Address64;
327
328
329 /*
330 * Get the table physical address (32-bit for RSDT, 64-bit for XSDT):
331 * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT
332 */
333 if (TableEntrySize == ACPI_RSDT_ENTRY_SIZE)
334 {
335 /*
336 * 32-bit platform, RSDT: Return 32-bit table entry
337 * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return
338 */
339 return ((ACPI_PHYSICAL_ADDRESS) (*ACPI_CAST_PTR (
340 UINT32, TableEntry)));
341 }
342 else
343 {
344 /*
345 * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return
346 * 64-bit platform, XSDT: Move (unaligned) 64-bit to local,
347 * return 64-bit
348 */
349 ACPI_MOVE_64_TO_64 (&Address64, TableEntry);
350
351 #if ACPI_MACHINE_WIDTH == 32
352 if (Address64 > ACPI_UINT32_MAX)
353 {
354 /* Will truncate 64-bit address to 32 bits, issue warning */
355
356 ACPI_BIOS_WARNING ((AE_INFO,
357 "64-bit Physical Address in XSDT is too large (0x%8.8X%8.8X),"
358 " truncating",
359 ACPI_FORMAT_UINT64 (Address64)));
360 }
361 #endif
362 return ((ACPI_PHYSICAL_ADDRESS) (Address64));
363 }
364 }
365
366
367 /*******************************************************************************
368 *
369 * FUNCTION: AcpiTbParseRootTable
370 *
371 * PARAMETERS: RsdpAddress - Pointer to the RSDP
372 *
373 * RETURN: Status
374 *
375 * DESCRIPTION: This function is called to parse the Root System Description
376 * Table (RSDT or XSDT)
377 *
378 * NOTE: Tables are mapped (not copied) for efficiency. The FACS must
379 * be mapped and cannot be copied because it contains the actual
380 * memory location of the ACPI Global Lock.
381 *
382 ******************************************************************************/
383
384 ACPI_STATUS ACPI_INIT_FUNCTION
AcpiTbParseRootTable(ACPI_PHYSICAL_ADDRESS RsdpAddress)385 AcpiTbParseRootTable (
386 ACPI_PHYSICAL_ADDRESS RsdpAddress)
387 {
388 ACPI_TABLE_RSDP *Rsdp;
389 UINT32 TableEntrySize;
390 UINT32 i;
391 UINT32 TableCount;
392 ACPI_TABLE_HEADER *Table;
393 ACPI_PHYSICAL_ADDRESS Address;
394 UINT32 Length;
395 UINT8 *TableEntry;
396 ACPI_STATUS Status;
397 UINT32 TableIndex;
398
399
400 ACPI_FUNCTION_TRACE (TbParseRootTable);
401
402
403 /* Map the entire RSDP and extract the address of the RSDT or XSDT */
404
405 Rsdp = AcpiOsMapMemory (RsdpAddress, sizeof (ACPI_TABLE_RSDP));
406 if (!Rsdp)
407 {
408 return_ACPI_STATUS (AE_NO_MEMORY);
409 }
410
411 AcpiTbPrintTableHeader (RsdpAddress,
412 ACPI_CAST_PTR (ACPI_TABLE_HEADER, Rsdp));
413
414 /* Use XSDT if present and not overridden. Otherwise, use RSDT */
415
416 if ((Rsdp->Revision > 1) &&
417 Rsdp->XsdtPhysicalAddress &&
418 !AcpiGbl_DoNotUseXsdt)
419 {
420 /*
421 * RSDP contains an XSDT (64-bit physical addresses). We must use
422 * the XSDT if the revision is > 1 and the XSDT pointer is present,
423 * as per the ACPI specification.
424 */
425 Address = (ACPI_PHYSICAL_ADDRESS) Rsdp->XsdtPhysicalAddress;
426 TableEntrySize = ACPI_XSDT_ENTRY_SIZE;
427 }
428 else
429 {
430 /* Root table is an RSDT (32-bit physical addresses) */
431
432 Address = (ACPI_PHYSICAL_ADDRESS) Rsdp->RsdtPhysicalAddress;
433 TableEntrySize = ACPI_RSDT_ENTRY_SIZE;
434 }
435
436 /*
437 * It is not possible to map more than one entry in some environments,
438 * so unmap the RSDP here before mapping other tables
439 */
440 AcpiOsUnmapMemory (Rsdp, sizeof (ACPI_TABLE_RSDP));
441
442 /* Map the RSDT/XSDT table header to get the full table length */
443
444 Table = AcpiOsMapMemory (Address, sizeof (ACPI_TABLE_HEADER));
445 if (!Table)
446 {
447 return_ACPI_STATUS (AE_NO_MEMORY);
448 }
449
450 AcpiTbPrintTableHeader (Address, Table);
451
452 /*
453 * Validate length of the table, and map entire table.
454 * Minimum length table must contain at least one entry.
455 */
456 Length = Table->Length;
457 AcpiOsUnmapMemory (Table, sizeof (ACPI_TABLE_HEADER));
458
459 if (Length < (sizeof (ACPI_TABLE_HEADER) + TableEntrySize))
460 {
461 ACPI_BIOS_ERROR ((AE_INFO,
462 "Invalid table length 0x%X in RSDT/XSDT", Length));
463 return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
464 }
465
466 Table = AcpiOsMapMemory (Address, Length);
467 if (!Table)
468 {
469 return_ACPI_STATUS (AE_NO_MEMORY);
470 }
471
472 /* Validate the root table checksum */
473
474 Status = AcpiTbVerifyChecksum (Table, Length);
475 if (ACPI_FAILURE (Status))
476 {
477 AcpiOsUnmapMemory (Table, Length);
478 return_ACPI_STATUS (Status);
479 }
480
481 /* Get the number of entries and pointer to first entry */
482
483 TableCount = (UINT32) ((Table->Length - sizeof (ACPI_TABLE_HEADER)) /
484 TableEntrySize);
485 TableEntry = ACPI_ADD_PTR (UINT8, Table, sizeof (ACPI_TABLE_HEADER));
486
487 /* Initialize the root table array from the RSDT/XSDT */
488
489 for (i = 0; i < TableCount; i++)
490 {
491 /* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */
492
493 Address = AcpiTbGetRootTableEntry (TableEntry, TableEntrySize);
494
495 /* Skip NULL entries in RSDT/XSDT */
496
497 if (!Address)
498 {
499 goto NextTable;
500 }
501
502 Status = AcpiTbInstallStandardTable (Address,
503 ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL, FALSE, TRUE, &TableIndex);
504
505 if (ACPI_SUCCESS (Status) &&
506 ACPI_COMPARE_NAME (
507 &AcpiGbl_RootTableList.Tables[TableIndex].Signature,
508 ACPI_SIG_FADT))
509 {
510 AcpiGbl_FadtIndex = TableIndex;
511 AcpiTbParseFadt ();
512 }
513
514 NextTable:
515
516 TableEntry += TableEntrySize;
517 }
518
519 AcpiOsUnmapMemory (Table, Length);
520 return_ACPI_STATUS (AE_OK);
521 }
522
523
524 /*******************************************************************************
525 *
526 * FUNCTION: AcpiTbGetTable
527 *
528 * PARAMETERS: TableDesc - Table descriptor
529 * OutTable - Where the pointer to the table is returned
530 *
531 * RETURN: Status and pointer to the requested table
532 *
533 * DESCRIPTION: Increase a reference to a table descriptor and return the
534 * validated table pointer.
535 * If the table descriptor is an entry of the root table list,
536 * this API must be invoked with ACPI_MTX_TABLES acquired.
537 *
538 ******************************************************************************/
539
540 ACPI_STATUS
AcpiTbGetTable(ACPI_TABLE_DESC * TableDesc,ACPI_TABLE_HEADER ** OutTable)541 AcpiTbGetTable (
542 ACPI_TABLE_DESC *TableDesc,
543 ACPI_TABLE_HEADER **OutTable)
544 {
545 ACPI_STATUS Status;
546
547
548 ACPI_FUNCTION_TRACE (AcpiTbGetTable);
549
550
551 if (TableDesc->ValidationCount == 0)
552 {
553 /* Table need to be "VALIDATED" */
554
555 Status = AcpiTbValidateTable (TableDesc);
556 if (ACPI_FAILURE (Status))
557 {
558 return_ACPI_STATUS (Status);
559 }
560 }
561
562 if (TableDesc->ValidationCount < ACPI_MAX_TABLE_VALIDATIONS)
563 {
564 TableDesc->ValidationCount++;
565
566 /*
567 * Detect ValidationCount overflows to ensure that the warning
568 * message will only be printed once.
569 */
570 if (TableDesc->ValidationCount >= ACPI_MAX_TABLE_VALIDATIONS)
571 {
572 ACPI_WARNING((AE_INFO,
573 "Table %p, Validation count overflows\n", TableDesc));
574 }
575 }
576
577 *OutTable = TableDesc->Pointer;
578 return_ACPI_STATUS (AE_OK);
579 }
580
581
582 /*******************************************************************************
583 *
584 * FUNCTION: AcpiTbPutTable
585 *
586 * PARAMETERS: TableDesc - Table descriptor
587 *
588 * RETURN: None
589 *
590 * DESCRIPTION: Decrease a reference to a table descriptor and release the
591 * validated table pointer if no references.
592 * If the table descriptor is an entry of the root table list,
593 * this API must be invoked with ACPI_MTX_TABLES acquired.
594 *
595 ******************************************************************************/
596
597 void
AcpiTbPutTable(ACPI_TABLE_DESC * TableDesc)598 AcpiTbPutTable (
599 ACPI_TABLE_DESC *TableDesc)
600 {
601
602 ACPI_FUNCTION_TRACE (AcpiTbPutTable);
603
604
605 if (TableDesc->ValidationCount < ACPI_MAX_TABLE_VALIDATIONS)
606 {
607 TableDesc->ValidationCount--;
608
609 /*
610 * Detect ValidationCount underflows to ensure that the warning
611 * message will only be printed once.
612 */
613 if (TableDesc->ValidationCount >= ACPI_MAX_TABLE_VALIDATIONS)
614 {
615 ACPI_WARNING ((AE_INFO,
616 "Table %p, Validation count underflows\n", TableDesc));
617 return_VOID;
618 }
619 }
620
621 if (TableDesc->ValidationCount == 0)
622 {
623 /* Table need to be "INVALIDATED" */
624
625 AcpiTbInvalidateTable (TableDesc);
626 }
627
628 return_VOID;
629 }
630