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 - 2023, 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 #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 UINT32 Address32;
327 UINT64 Address64;
328
329
330 /*
331 * Get the table physical address (32-bit for RSDT, 64-bit for XSDT):
332 * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT
333 */
334 if (TableEntrySize == ACPI_RSDT_ENTRY_SIZE)
335 {
336 /*
337 * 32-bit platform, RSDT: Return 32-bit table entry
338 * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return
339 */
340 ACPI_MOVE_32_TO_32(&Address32, TableEntry);
341 return Address32;
342 }
343 else
344 {
345 /*
346 * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return
347 * 64-bit platform, XSDT: Move (unaligned) 64-bit to local,
348 * return 64-bit
349 */
350 ACPI_MOVE_64_TO_64 (&Address64, TableEntry);
351
352 #if ACPI_MACHINE_WIDTH == 32
353 if (Address64 > ACPI_UINT32_MAX)
354 {
355 /* Will truncate 64-bit address to 32 bits, issue warning */
356
357 ACPI_BIOS_WARNING ((AE_INFO,
358 "64-bit Physical Address in XSDT is too large (0x%8.8X%8.8X),"
359 " truncating",
360 ACPI_FORMAT_UINT64 (Address64)));
361 }
362 #endif
363 return ((ACPI_PHYSICAL_ADDRESS) (Address64));
364 }
365 }
366
367
368 /*******************************************************************************
369 *
370 * FUNCTION: AcpiTbParseRootTable
371 *
372 * PARAMETERS: RsdpAddress - Pointer to the RSDP
373 *
374 * RETURN: Status
375 *
376 * DESCRIPTION: This function is called to parse the Root System Description
377 * Table (RSDT or XSDT)
378 *
379 * NOTE: Tables are mapped (not copied) for efficiency. The FACS must
380 * be mapped and cannot be copied because it contains the actual
381 * memory location of the ACPI Global Lock.
382 *
383 ******************************************************************************/
384
385 ACPI_STATUS ACPI_INIT_FUNCTION
AcpiTbParseRootTable(ACPI_PHYSICAL_ADDRESS RsdpAddress)386 AcpiTbParseRootTable (
387 ACPI_PHYSICAL_ADDRESS RsdpAddress)
388 {
389 ACPI_TABLE_RSDP *Rsdp;
390 UINT32 TableEntrySize;
391 UINT32 i;
392 UINT32 TableCount;
393 ACPI_TABLE_HEADER *Table;
394 ACPI_PHYSICAL_ADDRESS Address;
395 UINT32 Length;
396 UINT8 *TableEntry;
397 ACPI_STATUS Status;
398 UINT32 TableIndex;
399
400
401 ACPI_FUNCTION_TRACE (TbParseRootTable);
402
403
404 /* Map the entire RSDP and extract the address of the RSDT or XSDT */
405
406 Rsdp = AcpiOsMapMemory (RsdpAddress, sizeof (ACPI_TABLE_RSDP));
407 if (!Rsdp)
408 {
409 return_ACPI_STATUS (AE_NO_MEMORY);
410 }
411
412 AcpiTbPrintTableHeader (RsdpAddress,
413 ACPI_CAST_PTR (ACPI_TABLE_HEADER, Rsdp));
414
415 /* Use XSDT if present and not overridden. Otherwise, use RSDT */
416
417 if ((Rsdp->Revision > 1) &&
418 Rsdp->XsdtPhysicalAddress &&
419 !AcpiGbl_DoNotUseXsdt)
420 {
421 /*
422 * RSDP contains an XSDT (64-bit physical addresses). We must use
423 * the XSDT if the revision is > 1 and the XSDT pointer is present,
424 * as per the ACPI specification.
425 */
426 Address = (ACPI_PHYSICAL_ADDRESS) Rsdp->XsdtPhysicalAddress;
427 TableEntrySize = ACPI_XSDT_ENTRY_SIZE;
428 }
429 else
430 {
431 /* Root table is an RSDT (32-bit physical addresses) */
432
433 Address = (ACPI_PHYSICAL_ADDRESS) Rsdp->RsdtPhysicalAddress;
434 TableEntrySize = ACPI_RSDT_ENTRY_SIZE;
435 }
436
437 /*
438 * It is not possible to map more than one entry in some environments,
439 * so unmap the RSDP here before mapping other tables
440 */
441 AcpiOsUnmapMemory (Rsdp, sizeof (ACPI_TABLE_RSDP));
442
443 /* Map the RSDT/XSDT table header to get the full table length */
444
445 Table = AcpiOsMapMemory (Address, sizeof (ACPI_TABLE_HEADER));
446 if (!Table)
447 {
448 return_ACPI_STATUS (AE_NO_MEMORY);
449 }
450
451 AcpiTbPrintTableHeader (Address, Table);
452
453 /*
454 * Validate length of the table, and map entire table.
455 * Minimum length table must contain at least one entry.
456 */
457 Length = Table->Length;
458 AcpiOsUnmapMemory (Table, sizeof (ACPI_TABLE_HEADER));
459
460 if (Length < (sizeof (ACPI_TABLE_HEADER) + TableEntrySize))
461 {
462 ACPI_BIOS_ERROR ((AE_INFO,
463 "Invalid table length 0x%X in RSDT/XSDT", Length));
464 return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
465 }
466
467 Table = AcpiOsMapMemory (Address, Length);
468 if (!Table)
469 {
470 return_ACPI_STATUS (AE_NO_MEMORY);
471 }
472
473 /* Validate the root table checksum */
474
475 Status = AcpiUtVerifyChecksum (Table, Length);
476 if (ACPI_FAILURE (Status))
477 {
478 AcpiOsUnmapMemory (Table, Length);
479 return_ACPI_STATUS (Status);
480 }
481
482 /* Get the number of entries and pointer to first entry */
483
484 TableCount = (UINT32) ((Table->Length - sizeof (ACPI_TABLE_HEADER)) /
485 TableEntrySize);
486 TableEntry = ACPI_ADD_PTR (UINT8, Table, sizeof (ACPI_TABLE_HEADER));
487
488 /* Initialize the root table array from the RSDT/XSDT */
489
490 for (i = 0; i < TableCount; i++)
491 {
492 /* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */
493
494 Address = AcpiTbGetRootTableEntry (TableEntry, TableEntrySize);
495
496 /* Skip NULL entries in RSDT/XSDT */
497
498 if (!Address)
499 {
500 goto NextTable;
501 }
502
503 Status = AcpiTbInstallStandardTable (Address,
504 ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL, NULL, FALSE, TRUE,
505 &TableIndex);
506
507 if (ACPI_SUCCESS (Status) &&
508 ACPI_COMPARE_NAMESEG (
509 &AcpiGbl_RootTableList.Tables[TableIndex].Signature,
510 ACPI_SIG_FADT))
511 {
512 AcpiGbl_FadtIndex = TableIndex;
513 AcpiTbParseFadt ();
514 }
515
516 NextTable:
517
518 TableEntry += TableEntrySize;
519 }
520
521 AcpiOsUnmapMemory (Table, Length);
522 return_ACPI_STATUS (AE_OK);
523 }
524
525
526 /*******************************************************************************
527 *
528 * FUNCTION: AcpiTbGetTable
529 *
530 * PARAMETERS: TableDesc - Table descriptor
531 * OutTable - Where the pointer to the table is returned
532 *
533 * RETURN: Status and pointer to the requested table
534 *
535 * DESCRIPTION: Increase a reference to a table descriptor and return the
536 * validated table pointer.
537 * If the table descriptor is an entry of the root table list,
538 * this API must be invoked with ACPI_MTX_TABLES acquired.
539 *
540 ******************************************************************************/
541
542 ACPI_STATUS
AcpiTbGetTable(ACPI_TABLE_DESC * TableDesc,ACPI_TABLE_HEADER ** OutTable)543 AcpiTbGetTable (
544 ACPI_TABLE_DESC *TableDesc,
545 ACPI_TABLE_HEADER **OutTable)
546 {
547 ACPI_STATUS Status;
548
549
550 ACPI_FUNCTION_TRACE (AcpiTbGetTable);
551
552
553 if (TableDesc->ValidationCount == 0)
554 {
555 /* Table need to be "VALIDATED" */
556
557 Status = AcpiTbValidateTable (TableDesc);
558 if (ACPI_FAILURE (Status))
559 {
560 return_ACPI_STATUS (Status);
561 }
562 }
563
564 if (TableDesc->ValidationCount < ACPI_MAX_TABLE_VALIDATIONS)
565 {
566 TableDesc->ValidationCount++;
567
568 /*
569 * Detect ValidationCount overflows to ensure that the warning
570 * message will only be printed once.
571 */
572 if (TableDesc->ValidationCount >= ACPI_MAX_TABLE_VALIDATIONS)
573 {
574 ACPI_WARNING((AE_INFO,
575 "Table %p, Validation count overflows\n", TableDesc));
576 }
577 }
578
579 *OutTable = TableDesc->Pointer;
580 return_ACPI_STATUS (AE_OK);
581 }
582
583
584 /*******************************************************************************
585 *
586 * FUNCTION: AcpiTbPutTable
587 *
588 * PARAMETERS: TableDesc - Table descriptor
589 *
590 * RETURN: None
591 *
592 * DESCRIPTION: Decrease a reference to a table descriptor and release the
593 * validated table pointer if no references.
594 * If the table descriptor is an entry of the root table list,
595 * this API must be invoked with ACPI_MTX_TABLES acquired.
596 *
597 ******************************************************************************/
598
599 void
AcpiTbPutTable(ACPI_TABLE_DESC * TableDesc)600 AcpiTbPutTable (
601 ACPI_TABLE_DESC *TableDesc)
602 {
603
604 ACPI_FUNCTION_TRACE (AcpiTbPutTable);
605
606
607 if (TableDesc->ValidationCount < ACPI_MAX_TABLE_VALIDATIONS)
608 {
609 TableDesc->ValidationCount--;
610
611 /*
612 * Detect ValidationCount underflows to ensure that the warning
613 * message will only be printed once.
614 */
615 if (TableDesc->ValidationCount >= ACPI_MAX_TABLE_VALIDATIONS)
616 {
617 ACPI_WARNING ((AE_INFO,
618 "Table %p, Validation count underflows\n", TableDesc));
619 return_VOID;
620 }
621 }
622
623 if (TableDesc->ValidationCount == 0)
624 {
625 /* Table need to be "INVALIDATED" */
626
627 AcpiTbInvalidateTable (TableDesc);
628 }
629
630 return_VOID;
631 }
632