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 - 2024, 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 <contrib/dev/acpica/include/acpi.h>
153 #include <contrib/dev/acpica/include/accommon.h>
154 #include <contrib/dev/acpica/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 /*******************************************************************************
169 *
170 * FUNCTION: AcpiTbInitializeFacs
171 *
172 * PARAMETERS: None
173 *
174 * RETURN: Status
175 *
176 * DESCRIPTION: Create a permanent mapping for the FADT and save it in a global
177 * for accessing the Global Lock and Firmware Waking Vector
178 *
179 ******************************************************************************/
180
181 ACPI_STATUS
AcpiTbInitializeFacs(void)182 AcpiTbInitializeFacs (
183 void)
184 {
185 ACPI_TABLE_FACS *Facs;
186
187 if (AcpiGbl_FADT.XFacs &&
188 (!AcpiGbl_FADT.Facs || !AcpiGbl_Use32BitFacsAddresses))
189 {
190 (void) AcpiGetTableByIndex (AcpiGbl_XFacsIndex,
191 ACPI_CAST_INDIRECT_PTR (ACPI_TABLE_HEADER, &Facs));
192 AcpiGbl_FACS = Facs;
193 }
194 else if (AcpiGbl_FADT.Facs)
195 {
196 (void) AcpiGetTableByIndex (AcpiGbl_FacsIndex,
197 ACPI_CAST_INDIRECT_PTR (ACPI_TABLE_HEADER, &Facs));
198 AcpiGbl_FACS = Facs;
199 }
200
201 /* If there is no FACS, just continue. There was already an error msg */
202
203 return (AE_OK);
204 }
205
206
207 /*******************************************************************************
208 *
209 * FUNCTION: AcpiTbCheckDsdtHeader
210 *
211 * PARAMETERS: None
212 *
213 * RETURN: None
214 *
215 * DESCRIPTION: Quick compare to check validity of the DSDT. This will detect
216 * if the DSDT has been replaced from outside the OS and/or if
217 * the DSDT header has been corrupted.
218 *
219 ******************************************************************************/
220
221 void
AcpiTbCheckDsdtHeader(void)222 AcpiTbCheckDsdtHeader (
223 void)
224 {
225
226 /* Compare original length and checksum to current values */
227
228 if (AcpiGbl_OriginalDsdtHeader.Length != AcpiGbl_DSDT->Length ||
229 AcpiGbl_OriginalDsdtHeader.Checksum != AcpiGbl_DSDT->Checksum)
230 {
231 ACPI_BIOS_ERROR ((AE_INFO,
232 "The DSDT has been corrupted or replaced - "
233 "old, new headers below"));
234
235 AcpiTbPrintTableHeader (0, &AcpiGbl_OriginalDsdtHeader);
236 AcpiTbPrintTableHeader (0, AcpiGbl_DSDT);
237
238 /* Disable further error messages */
239
240 AcpiGbl_OriginalDsdtHeader.Length = AcpiGbl_DSDT->Length;
241 AcpiGbl_OriginalDsdtHeader.Checksum = AcpiGbl_DSDT->Checksum;
242 }
243 }
244
245
246 /*******************************************************************************
247 *
248 * FUNCTION: AcpiTbCopyDsdt
249 *
250 * PARAMETERS: TableIndex - Index of installed table to copy
251 *
252 * RETURN: The copied DSDT
253 *
254 * DESCRIPTION: Implements a subsystem option to copy the DSDT to local memory.
255 * Some very bad BIOSs are known to either corrupt the DSDT or
256 * install a new, bad DSDT. This copy works around the problem.
257 *
258 ******************************************************************************/
259
260 ACPI_TABLE_HEADER *
AcpiTbCopyDsdt(UINT32 TableIndex)261 AcpiTbCopyDsdt (
262 UINT32 TableIndex)
263 {
264 ACPI_TABLE_HEADER *NewTable;
265 ACPI_TABLE_DESC *TableDesc;
266
267
268 TableDesc = &AcpiGbl_RootTableList.Tables[TableIndex];
269
270 NewTable = ACPI_ALLOCATE (TableDesc->Length);
271 if (!NewTable)
272 {
273 ACPI_ERROR ((AE_INFO, "Could not copy DSDT of length 0x%X",
274 TableDesc->Length));
275 return (NULL);
276 }
277
278 memcpy (NewTable, TableDesc->Pointer, TableDesc->Length);
279 AcpiTbUninstallTable (TableDesc);
280
281 AcpiTbInitTableDescriptor (
282 &AcpiGbl_RootTableList.Tables[AcpiGbl_DsdtIndex],
283 ACPI_PTR_TO_PHYSADDR (NewTable),
284 ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL, NewTable);
285
286 ACPI_INFO ((
287 "Forced DSDT copy: length 0x%05X copied locally, original unmapped",
288 NewTable->Length));
289
290 return (NewTable);
291 }
292
293
294 /*******************************************************************************
295 *
296 * FUNCTION: AcpiTbGetRootTableEntry
297 *
298 * PARAMETERS: TableEntry - Pointer to the RSDT/XSDT table entry
299 * TableEntrySize - sizeof 32 or 64 (RSDT or XSDT)
300 *
301 * RETURN: Physical address extracted from the root table
302 *
303 * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on
304 * both 32-bit and 64-bit platforms
305 *
306 * NOTE: ACPI_PHYSICAL_ADDRESS is 32-bit on 32-bit platforms, 64-bit on
307 * 64-bit platforms.
308 *
309 ******************************************************************************/
310
311 static ACPI_PHYSICAL_ADDRESS
AcpiTbGetRootTableEntry(UINT8 * TableEntry,UINT32 TableEntrySize)312 AcpiTbGetRootTableEntry (
313 UINT8 *TableEntry,
314 UINT32 TableEntrySize)
315 {
316 UINT32 Address32;
317 UINT64 Address64;
318
319
320 /*
321 * Get the table physical address (32-bit for RSDT, 64-bit for XSDT):
322 * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT
323 */
324 if (TableEntrySize == ACPI_RSDT_ENTRY_SIZE)
325 {
326 /*
327 * 32-bit platform, RSDT: Return 32-bit table entry
328 * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return
329 */
330 ACPI_MOVE_32_TO_32(&Address32, TableEntry);
331 return Address32;
332 }
333 else
334 {
335 /*
336 * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return
337 * 64-bit platform, XSDT: Move (unaligned) 64-bit to local,
338 * return 64-bit
339 */
340 ACPI_MOVE_64_TO_64 (&Address64, TableEntry);
341
342 #if ACPI_MACHINE_WIDTH == 32
343 if (Address64 > ACPI_UINT32_MAX)
344 {
345 /* Will truncate 64-bit address to 32 bits, issue warning */
346
347 ACPI_BIOS_WARNING ((AE_INFO,
348 "64-bit Physical Address in XSDT is too large (0x%8.8X%8.8X),"
349 " truncating",
350 ACPI_FORMAT_UINT64 (Address64)));
351 }
352 #endif
353 return ((ACPI_PHYSICAL_ADDRESS) (Address64));
354 }
355 }
356
357
358 /*******************************************************************************
359 *
360 * FUNCTION: AcpiTbParseRootTable
361 *
362 * PARAMETERS: RsdpAddress - Pointer to the RSDP
363 *
364 * RETURN: Status
365 *
366 * DESCRIPTION: This function is called to parse the Root System Description
367 * Table (RSDT or XSDT)
368 *
369 * NOTE: Tables are mapped (not copied) for efficiency. The FACS must
370 * be mapped and cannot be copied because it contains the actual
371 * memory location of the ACPI Global Lock.
372 *
373 ******************************************************************************/
374
375 ACPI_STATUS ACPI_INIT_FUNCTION
AcpiTbParseRootTable(ACPI_PHYSICAL_ADDRESS RsdpAddress)376 AcpiTbParseRootTable (
377 ACPI_PHYSICAL_ADDRESS RsdpAddress)
378 {
379 ACPI_TABLE_RSDP *Rsdp;
380 UINT32 TableEntrySize;
381 UINT32 i;
382 UINT32 TableCount;
383 ACPI_TABLE_HEADER *Table;
384 ACPI_PHYSICAL_ADDRESS Address;
385 UINT32 Length;
386 UINT8 *TableEntry;
387 ACPI_STATUS Status;
388 UINT32 TableIndex;
389
390
391 ACPI_FUNCTION_TRACE (TbParseRootTable);
392
393
394 /* Map the entire RSDP and extract the address of the RSDT or XSDT */
395
396 Rsdp = AcpiOsMapMemory (RsdpAddress, sizeof (ACPI_TABLE_RSDP));
397 if (!Rsdp)
398 {
399 return_ACPI_STATUS (AE_NO_MEMORY);
400 }
401
402 AcpiTbPrintTableHeader (RsdpAddress,
403 ACPI_CAST_PTR (ACPI_TABLE_HEADER, Rsdp));
404
405 /* Use XSDT if present and not overridden. Otherwise, use RSDT */
406
407 if ((Rsdp->Revision > 1) &&
408 Rsdp->XsdtPhysicalAddress &&
409 !AcpiGbl_DoNotUseXsdt)
410 {
411 /*
412 * RSDP contains an XSDT (64-bit physical addresses). We must use
413 * the XSDT if the revision is > 1 and the XSDT pointer is present,
414 * as per the ACPI specification.
415 */
416 Address = (ACPI_PHYSICAL_ADDRESS) Rsdp->XsdtPhysicalAddress;
417 TableEntrySize = ACPI_XSDT_ENTRY_SIZE;
418 }
419 else
420 {
421 /* Root table is an RSDT (32-bit physical addresses) */
422
423 Address = (ACPI_PHYSICAL_ADDRESS) Rsdp->RsdtPhysicalAddress;
424 TableEntrySize = ACPI_RSDT_ENTRY_SIZE;
425 }
426
427 /*
428 * It is not possible to map more than one entry in some environments,
429 * so unmap the RSDP here before mapping other tables
430 */
431 AcpiOsUnmapMemory (Rsdp, sizeof (ACPI_TABLE_RSDP));
432
433 /* Map the RSDT/XSDT table header to get the full table length */
434
435 Table = AcpiOsMapMemory (Address, sizeof (ACPI_TABLE_HEADER));
436 if (!Table)
437 {
438 return_ACPI_STATUS (AE_NO_MEMORY);
439 }
440
441 AcpiTbPrintTableHeader (Address, Table);
442
443 /*
444 * Validate length of the table, and map entire table.
445 * Minimum length table must contain at least one entry.
446 */
447 Length = Table->Length;
448 AcpiOsUnmapMemory (Table, sizeof (ACPI_TABLE_HEADER));
449
450 if (Length < (sizeof (ACPI_TABLE_HEADER) + TableEntrySize))
451 {
452 ACPI_BIOS_ERROR ((AE_INFO,
453 "Invalid table length 0x%X in RSDT/XSDT", Length));
454 return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
455 }
456
457 Table = AcpiOsMapMemory (Address, Length);
458 if (!Table)
459 {
460 return_ACPI_STATUS (AE_NO_MEMORY);
461 }
462
463 /* Validate the root table checksum */
464
465 Status = AcpiUtVerifyChecksum (Table, Length);
466 if (ACPI_FAILURE (Status))
467 {
468 AcpiOsUnmapMemory (Table, Length);
469 return_ACPI_STATUS (Status);
470 }
471
472 /* Get the number of entries and pointer to first entry */
473
474 TableCount = (UINT32) ((Table->Length - sizeof (ACPI_TABLE_HEADER)) /
475 TableEntrySize);
476 TableEntry = ACPI_ADD_PTR (UINT8, Table, sizeof (ACPI_TABLE_HEADER));
477
478 /* Initialize the root table array from the RSDT/XSDT */
479
480 for (i = 0; i < TableCount; i++)
481 {
482 /* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */
483
484 Address = AcpiTbGetRootTableEntry (TableEntry, TableEntrySize);
485
486 /* Skip NULL entries in RSDT/XSDT */
487
488 if (!Address)
489 {
490 goto NextTable;
491 }
492
493 Status = AcpiTbInstallStandardTable (Address,
494 ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL, NULL, FALSE, TRUE,
495 &TableIndex);
496
497 if (ACPI_SUCCESS (Status) &&
498 ACPI_COMPARE_NAMESEG (
499 &AcpiGbl_RootTableList.Tables[TableIndex].Signature,
500 ACPI_SIG_FADT))
501 {
502 AcpiGbl_FadtIndex = TableIndex;
503 AcpiTbParseFadt ();
504 }
505
506 NextTable:
507
508 TableEntry += TableEntrySize;
509 }
510
511 AcpiOsUnmapMemory (Table, Length);
512 return_ACPI_STATUS (AE_OK);
513 }
514
515
516 /*******************************************************************************
517 *
518 * FUNCTION: AcpiTbGetTable
519 *
520 * PARAMETERS: TableDesc - Table descriptor
521 * OutTable - Where the pointer to the table is returned
522 *
523 * RETURN: Status and pointer to the requested table
524 *
525 * DESCRIPTION: Increase a reference to a table descriptor and return the
526 * validated table pointer.
527 * If the table descriptor is an entry of the root table list,
528 * this API must be invoked with ACPI_MTX_TABLES acquired.
529 *
530 ******************************************************************************/
531
532 ACPI_STATUS
AcpiTbGetTable(ACPI_TABLE_DESC * TableDesc,ACPI_TABLE_HEADER ** OutTable)533 AcpiTbGetTable (
534 ACPI_TABLE_DESC *TableDesc,
535 ACPI_TABLE_HEADER **OutTable)
536 {
537 ACPI_STATUS Status;
538
539
540 ACPI_FUNCTION_TRACE (AcpiTbGetTable);
541
542
543 if (TableDesc->ValidationCount == 0)
544 {
545 /* Table need to be "VALIDATED" */
546
547 Status = AcpiTbValidateTable (TableDesc);
548 if (ACPI_FAILURE (Status))
549 {
550 return_ACPI_STATUS (Status);
551 }
552 }
553
554 if (TableDesc->ValidationCount < ACPI_MAX_TABLE_VALIDATIONS)
555 {
556 TableDesc->ValidationCount++;
557
558 /*
559 * Detect ValidationCount overflows to ensure that the warning
560 * message will only be printed once.
561 */
562 if (TableDesc->ValidationCount >= ACPI_MAX_TABLE_VALIDATIONS)
563 {
564 ACPI_WARNING((AE_INFO,
565 "Table %p, Validation count overflows\n", TableDesc));
566 }
567 }
568
569 *OutTable = TableDesc->Pointer;
570 return_ACPI_STATUS (AE_OK);
571 }
572
573
574 /*******************************************************************************
575 *
576 * FUNCTION: AcpiTbPutTable
577 *
578 * PARAMETERS: TableDesc - Table descriptor
579 *
580 * RETURN: None
581 *
582 * DESCRIPTION: Decrease a reference to a table descriptor and release the
583 * validated table pointer if no references.
584 * If the table descriptor is an entry of the root table list,
585 * this API must be invoked with ACPI_MTX_TABLES acquired.
586 *
587 ******************************************************************************/
588
589 void
AcpiTbPutTable(ACPI_TABLE_DESC * TableDesc)590 AcpiTbPutTable (
591 ACPI_TABLE_DESC *TableDesc)
592 {
593
594 ACPI_FUNCTION_TRACE (AcpiTbPutTable);
595
596
597 if (TableDesc->ValidationCount < ACPI_MAX_TABLE_VALIDATIONS)
598 {
599 TableDesc->ValidationCount--;
600
601 /*
602 * Detect ValidationCount underflows to ensure that the warning
603 * message will only be printed once.
604 */
605 if (TableDesc->ValidationCount >= ACPI_MAX_TABLE_VALIDATIONS)
606 {
607 ACPI_WARNING ((AE_INFO,
608 "Table %p, Validation count underflows\n", TableDesc));
609 return_VOID;
610 }
611 }
612
613 if (TableDesc->ValidationCount == 0)
614 {
615 /* Table need to be "INVALIDATED" */
616
617 AcpiTbInvalidateTable (TableDesc);
618 }
619
620 return_VOID;
621 }
622