1 /******************************************************************************
2 *
3 * Module Name: utosi - Support for the _OSI predefined control method
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 "acpi.h"
153 #include "accommon.h"
154
155
156 #define _COMPONENT ACPI_UTILITIES
157 ACPI_MODULE_NAME ("utosi")
158
159
160 /******************************************************************************
161 *
162 * ACPICA policy for new _OSI strings:
163 *
164 * It is the stated policy of ACPICA that new _OSI strings will be integrated
165 * into this module as soon as possible after they are defined. It is strongly
166 * recommended that all ACPICA hosts mirror this policy and integrate any
167 * changes to this module as soon as possible. There are several historical
168 * reasons behind this policy:
169 *
170 * 1) New BIOSs tend to test only the case where the host responds TRUE to
171 * the latest version of Windows, which would respond to the latest/newest
172 * _OSI string. Not responding TRUE to the latest version of Windows will
173 * risk executing untested code paths throughout the DSDT and SSDTs.
174 *
175 * 2) If a new _OSI string is recognized only after a significant delay, this
176 * has the potential to cause problems on existing working machines because
177 * of the possibility that a new and different path through the ASL code
178 * will be executed.
179 *
180 * 3) New _OSI strings are tending to come out about once per year. A delay
181 * in recognizing a new string for a significant amount of time risks the
182 * release of another string which only compounds the initial problem.
183 *
184 *****************************************************************************/
185
186
187 /*
188 * Strings supported by the _OSI predefined control method (which is
189 * implemented internally within this module.)
190 *
191 * March 2009: Removed "Linux" as this host no longer wants to respond true
192 * for this string. Basically, the only safe OS strings are windows-related
193 * and in many or most cases represent the only test path within the
194 * BIOS-provided ASL code.
195 *
196 * The last element of each entry is used to track the newest version of
197 * Windows that the BIOS has requested.
198 */
199 static ACPI_INTERFACE_INFO AcpiDefaultSupportedInterfaces[] =
200 {
201 /* Operating System Vendor Strings */
202
203 {"Windows 2000", NULL, 0, ACPI_OSI_WIN_2000}, /* Windows 2000 */
204 {"Windows 2001", NULL, 0, ACPI_OSI_WIN_XP}, /* Windows XP */
205 {"Windows 2001 SP1", NULL, 0, ACPI_OSI_WIN_XP_SP1}, /* Windows XP SP1 */
206 {"Windows 2001.1", NULL, 0, ACPI_OSI_WINSRV_2003}, /* Windows Server 2003 */
207 {"Windows 2001 SP2", NULL, 0, ACPI_OSI_WIN_XP_SP2}, /* Windows XP SP2 */
208 {"Windows 2001.1 SP1", NULL, 0, ACPI_OSI_WINSRV_2003_SP1}, /* Windows Server 2003 SP1 - Added 03/2006 */
209 {"Windows 2006", NULL, 0, ACPI_OSI_WIN_VISTA}, /* Windows Vista - Added 03/2006 */
210 {"Windows 2006.1", NULL, 0, ACPI_OSI_WINSRV_2008}, /* Windows Server 2008 - Added 09/2009 */
211 {"Windows 2006 SP1", NULL, 0, ACPI_OSI_WIN_VISTA_SP1}, /* Windows Vista SP1 - Added 09/2009 */
212 {"Windows 2006 SP2", NULL, 0, ACPI_OSI_WIN_VISTA_SP2}, /* Windows Vista SP2 - Added 09/2010 */
213 {"Windows 2009", NULL, 0, ACPI_OSI_WIN_7}, /* Windows 7 and Server 2008 R2 - Added 09/2009 */
214 {"Windows 2012", NULL, 0, ACPI_OSI_WIN_8}, /* Windows 8 and Server 2012 - Added 08/2012 */
215 {"Windows 2013", NULL, 0, ACPI_OSI_WIN_8_1}, /* Windows 8.1 and Server 2012 R2 - Added 01/2014 */
216 {"Windows 2015", NULL, 0, ACPI_OSI_WIN_10}, /* Windows 10 - Added 03/2015 */
217 {"Windows 2016", NULL, 0, ACPI_OSI_WIN_10_RS1}, /* Windows 10 version 1607 - Added 12/2017 */
218 {"Windows 2017", NULL, 0, ACPI_OSI_WIN_10_RS2}, /* Windows 10 version 1703 - Added 12/2017 */
219 {"Windows 2017.2", NULL, 0, ACPI_OSI_WIN_10_RS3}, /* Windows 10 version 1709 - Added 02/2018 */
220 {"Windows 2018", NULL, 0, ACPI_OSI_WIN_10_RS4}, /* Windows 10 version 1803 - Added 11/2018 */
221 {"Windows 2018.2", NULL, 0, ACPI_OSI_WIN_10_RS5}, /* Windows 10 version 1809 - Added 11/2018 */
222 {"Windows 2019", NULL, 0, ACPI_OSI_WIN_10_19H1}, /* Windows 10 version 1903 - Added 08/2019 */
223 {"Windows 2020", NULL, 0, ACPI_OSI_WIN_10_20H1}, /* Windows 10 version 2004 - Added 08/2021 */
224 {"Windows 2021", NULL, 0, ACPI_OSI_WIN_11}, /* Windows 11 - Added 01/2022 */
225
226 /* Feature Group Strings */
227
228 {"Extended Address Space Descriptor", NULL, ACPI_OSI_FEATURE, 0},
229
230 /*
231 * All "optional" feature group strings (features that are implemented
232 * by the host) should be dynamically modified to VALID by the host via
233 * AcpiInstallInterface or AcpiUpdateInterfaces. Such optional feature
234 * group strings are set as INVALID by default here.
235 */
236
237 {"Module Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},
238 {"Processor Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},
239 {"3.0 Thermal Model", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},
240 {"3.0 _SCP Extensions", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},
241 {"Processor Aggregator Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0}
242 };
243
244
245 /*******************************************************************************
246 *
247 * FUNCTION: AcpiUtInitializeInterfaces
248 *
249 * PARAMETERS: None
250 *
251 * RETURN: Status
252 *
253 * DESCRIPTION: Initialize the global _OSI supported interfaces list
254 *
255 ******************************************************************************/
256
257 ACPI_STATUS
AcpiUtInitializeInterfaces(void)258 AcpiUtInitializeInterfaces (
259 void)
260 {
261 ACPI_STATUS Status;
262 UINT32 i;
263
264
265 Status = AcpiOsAcquireMutex (AcpiGbl_OsiMutex, ACPI_WAIT_FOREVER);
266 if (ACPI_FAILURE (Status))
267 {
268 return (Status);
269 }
270
271 AcpiGbl_SupportedInterfaces = AcpiDefaultSupportedInterfaces;
272
273 /* Link the static list of supported interfaces */
274
275 for (i = 0;
276 i < (ACPI_ARRAY_LENGTH (AcpiDefaultSupportedInterfaces) - 1);
277 i++)
278 {
279 AcpiDefaultSupportedInterfaces[i].Next =
280 &AcpiDefaultSupportedInterfaces[(ACPI_SIZE) i + 1];
281 }
282
283 AcpiOsReleaseMutex (AcpiGbl_OsiMutex);
284 return (AE_OK);
285 }
286
287
288 /*******************************************************************************
289 *
290 * FUNCTION: AcpiUtInterfaceTerminate
291 *
292 * PARAMETERS: None
293 *
294 * RETURN: Status
295 *
296 * DESCRIPTION: Delete all interfaces in the global list. Sets
297 * AcpiGbl_SupportedInterfaces to NULL.
298 *
299 ******************************************************************************/
300
301 ACPI_STATUS
AcpiUtInterfaceTerminate(void)302 AcpiUtInterfaceTerminate (
303 void)
304 {
305 ACPI_STATUS Status;
306 ACPI_INTERFACE_INFO *NextInterface;
307
308
309 Status = AcpiOsAcquireMutex (AcpiGbl_OsiMutex, ACPI_WAIT_FOREVER);
310 if (ACPI_FAILURE (Status))
311 {
312 return (Status);
313 }
314
315 NextInterface = AcpiGbl_SupportedInterfaces;
316 while (NextInterface)
317 {
318 AcpiGbl_SupportedInterfaces = NextInterface->Next;
319
320 if (NextInterface->Flags & ACPI_OSI_DYNAMIC)
321 {
322 /* Only interfaces added at runtime can be freed */
323
324 ACPI_FREE (NextInterface->Name);
325 ACPI_FREE (NextInterface);
326 }
327 else
328 {
329 /* Interface is in static list. Reset it to invalid or valid. */
330
331 if (NextInterface->Flags & ACPI_OSI_DEFAULT_INVALID)
332 {
333 NextInterface->Flags |= ACPI_OSI_INVALID;
334 }
335 else
336 {
337 NextInterface->Flags &= ~ACPI_OSI_INVALID;
338 }
339 }
340
341 NextInterface = AcpiGbl_SupportedInterfaces;
342 }
343
344 AcpiOsReleaseMutex (AcpiGbl_OsiMutex);
345 return (AE_OK);
346 }
347
348
349 /*******************************************************************************
350 *
351 * FUNCTION: AcpiUtInstallInterface
352 *
353 * PARAMETERS: InterfaceName - The interface to install
354 *
355 * RETURN: Status
356 *
357 * DESCRIPTION: Install the interface into the global interface list.
358 * Caller MUST hold AcpiGbl_OsiMutex
359 *
360 ******************************************************************************/
361
362 ACPI_STATUS
AcpiUtInstallInterface(ACPI_STRING InterfaceName)363 AcpiUtInstallInterface (
364 ACPI_STRING InterfaceName)
365 {
366 ACPI_INTERFACE_INFO *InterfaceInfo;
367
368
369 /* Allocate info block and space for the name string */
370
371 InterfaceInfo = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_INTERFACE_INFO));
372 if (!InterfaceInfo)
373 {
374 return (AE_NO_MEMORY);
375 }
376
377 InterfaceInfo->Name = ACPI_ALLOCATE_ZEROED (strlen (InterfaceName) + 1);
378 if (!InterfaceInfo->Name)
379 {
380 ACPI_FREE (InterfaceInfo);
381 return (AE_NO_MEMORY);
382 }
383
384 /* Initialize new info and insert at the head of the global list */
385
386 strcpy (InterfaceInfo->Name, InterfaceName);
387 InterfaceInfo->Flags = ACPI_OSI_DYNAMIC;
388 InterfaceInfo->Next = AcpiGbl_SupportedInterfaces;
389
390 AcpiGbl_SupportedInterfaces = InterfaceInfo;
391 return (AE_OK);
392 }
393
394
395 /*******************************************************************************
396 *
397 * FUNCTION: AcpiUtRemoveInterface
398 *
399 * PARAMETERS: InterfaceName - The interface to remove
400 *
401 * RETURN: Status
402 *
403 * DESCRIPTION: Remove the interface from the global interface list.
404 * Caller MUST hold AcpiGbl_OsiMutex
405 *
406 ******************************************************************************/
407
408 ACPI_STATUS
AcpiUtRemoveInterface(ACPI_STRING InterfaceName)409 AcpiUtRemoveInterface (
410 ACPI_STRING InterfaceName)
411 {
412 ACPI_INTERFACE_INFO *PreviousInterface;
413 ACPI_INTERFACE_INFO *NextInterface;
414
415
416 PreviousInterface = NextInterface = AcpiGbl_SupportedInterfaces;
417 while (NextInterface)
418 {
419 if (!strcmp (InterfaceName, NextInterface->Name))
420 {
421 /*
422 * Found: name is in either the static list
423 * or was added at runtime
424 */
425 if (NextInterface->Flags & ACPI_OSI_DYNAMIC)
426 {
427 /* Interface was added dynamically, remove and free it */
428
429 if (PreviousInterface == NextInterface)
430 {
431 AcpiGbl_SupportedInterfaces = NextInterface->Next;
432 }
433 else
434 {
435 PreviousInterface->Next = NextInterface->Next;
436 }
437
438 ACPI_FREE (NextInterface->Name);
439 ACPI_FREE (NextInterface);
440 }
441 else
442 {
443 /*
444 * Interface is in static list. If marked invalid, then
445 * it does not actually exist. Else, mark it invalid.
446 */
447 if (NextInterface->Flags & ACPI_OSI_INVALID)
448 {
449 return (AE_NOT_EXIST);
450 }
451
452 NextInterface->Flags |= ACPI_OSI_INVALID;
453 }
454
455 return (AE_OK);
456 }
457
458 PreviousInterface = NextInterface;
459 NextInterface = NextInterface->Next;
460 }
461
462 /* Interface was not found */
463
464 return (AE_NOT_EXIST);
465 }
466
467
468 /*******************************************************************************
469 *
470 * FUNCTION: AcpiUtUpdateInterfaces
471 *
472 * PARAMETERS: Action - Actions to be performed during the
473 * update
474 *
475 * RETURN: Status
476 *
477 * DESCRIPTION: Update _OSI interface strings, disabling or enabling OS vendor
478 * strings or/and feature group strings.
479 * Caller MUST hold AcpiGbl_OsiMutex
480 *
481 ******************************************************************************/
482
483 ACPI_STATUS
AcpiUtUpdateInterfaces(UINT8 Action)484 AcpiUtUpdateInterfaces (
485 UINT8 Action)
486 {
487 ACPI_INTERFACE_INFO *NextInterface;
488
489
490 NextInterface = AcpiGbl_SupportedInterfaces;
491 while (NextInterface)
492 {
493 if (((NextInterface->Flags & ACPI_OSI_FEATURE) &&
494 (Action & ACPI_FEATURE_STRINGS)) ||
495 (!(NextInterface->Flags & ACPI_OSI_FEATURE) &&
496 (Action & ACPI_VENDOR_STRINGS)))
497 {
498 if (Action & ACPI_DISABLE_INTERFACES)
499 {
500 /* Mark the interfaces as invalid */
501
502 NextInterface->Flags |= ACPI_OSI_INVALID;
503 }
504 else
505 {
506 /* Mark the interfaces as valid */
507
508 NextInterface->Flags &= ~ACPI_OSI_INVALID;
509 }
510 }
511
512 NextInterface = NextInterface->Next;
513 }
514
515 return (AE_OK);
516 }
517
518
519 /*******************************************************************************
520 *
521 * FUNCTION: AcpiUtGetInterface
522 *
523 * PARAMETERS: InterfaceName - The interface to find
524 *
525 * RETURN: ACPI_INTERFACE_INFO if found. NULL if not found.
526 *
527 * DESCRIPTION: Search for the specified interface name in the global list.
528 * Caller MUST hold AcpiGbl_OsiMutex
529 *
530 ******************************************************************************/
531
532 ACPI_INTERFACE_INFO *
AcpiUtGetInterface(ACPI_STRING InterfaceName)533 AcpiUtGetInterface (
534 ACPI_STRING InterfaceName)
535 {
536 ACPI_INTERFACE_INFO *NextInterface;
537
538
539 NextInterface = AcpiGbl_SupportedInterfaces;
540 while (NextInterface)
541 {
542 if (!strcmp (InterfaceName, NextInterface->Name))
543 {
544 return (NextInterface);
545 }
546
547 NextInterface = NextInterface->Next;
548 }
549
550 return (NULL);
551 }
552
553
554 /*******************************************************************************
555 *
556 * FUNCTION: AcpiUtOsiImplementation
557 *
558 * PARAMETERS: WalkState - Current walk state
559 *
560 * RETURN: Status
561 * Integer: TRUE (0) if input string is matched
562 * FALSE (-1) if string is not matched
563 *
564 * DESCRIPTION: Implementation of the _OSI predefined control method. When
565 * an invocation of _OSI is encountered in the system AML,
566 * control is transferred to this function.
567 *
568 * (August 2016)
569 * Note: _OSI is now defined to return "Ones" to indicate a match, for
570 * compatibility with other ACPI implementations. On a 32-bit DSDT, Ones
571 * is 0xFFFFFFFF. On a 64-bit DSDT, Ones is 0xFFFFFFFFFFFFFFFF
572 * (ACPI_UINT64_MAX).
573 *
574 * This function always returns ACPI_UINT64_MAX for TRUE, and later code
575 * will truncate this to 32 bits if necessary.
576 *
577 ******************************************************************************/
578
579 ACPI_STATUS
AcpiUtOsiImplementation(ACPI_WALK_STATE * WalkState)580 AcpiUtOsiImplementation (
581 ACPI_WALK_STATE *WalkState)
582 {
583 ACPI_OPERAND_OBJECT *StringDesc;
584 ACPI_OPERAND_OBJECT *ReturnDesc;
585 ACPI_INTERFACE_INFO *InterfaceInfo;
586 ACPI_INTERFACE_HANDLER InterfaceHandler;
587 ACPI_STATUS Status;
588 UINT64 ReturnValue;
589
590
591 ACPI_FUNCTION_TRACE (UtOsiImplementation);
592
593
594 /* Validate the string input argument (from the AML caller) */
595
596 StringDesc = WalkState->Arguments[0].Object;
597 if (!StringDesc ||
598 (StringDesc->Common.Type != ACPI_TYPE_STRING))
599 {
600 return_ACPI_STATUS (AE_TYPE);
601 }
602
603 /* Create a return object */
604
605 ReturnDesc = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER);
606 if (!ReturnDesc)
607 {
608 return_ACPI_STATUS (AE_NO_MEMORY);
609 }
610
611 /* Default return value is 0, NOT SUPPORTED */
612
613 ReturnValue = 0;
614 Status = AcpiOsAcquireMutex (AcpiGbl_OsiMutex, ACPI_WAIT_FOREVER);
615 if (ACPI_FAILURE (Status))
616 {
617 AcpiUtRemoveReference (ReturnDesc);
618 return_ACPI_STATUS (Status);
619 }
620
621 /* Lookup the interface in the global _OSI list */
622
623 InterfaceInfo = AcpiUtGetInterface (StringDesc->String.Pointer);
624 if (InterfaceInfo &&
625 !(InterfaceInfo->Flags & ACPI_OSI_INVALID))
626 {
627 /*
628 * The interface is supported.
629 * Update the OsiData if necessary. We keep track of the latest
630 * version of Windows that has been requested by the BIOS.
631 */
632 if (InterfaceInfo->Value > AcpiGbl_OsiData)
633 {
634 AcpiGbl_OsiData = InterfaceInfo->Value;
635 }
636
637 ReturnValue = ACPI_UINT64_MAX;
638 }
639
640 AcpiOsReleaseMutex (AcpiGbl_OsiMutex);
641
642 /*
643 * Invoke an optional _OSI interface handler. The host OS may wish
644 * to do some interface-specific handling. For example, warn about
645 * certain interfaces or override the true/false support value.
646 */
647 InterfaceHandler = AcpiGbl_InterfaceHandler;
648 if (InterfaceHandler)
649 {
650 if (InterfaceHandler (
651 StringDesc->String.Pointer, (UINT32) ReturnValue))
652 {
653 ReturnValue = ACPI_UINT64_MAX;
654 }
655 }
656
657 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INFO,
658 "ACPI: BIOS _OSI(\"%s\") is %ssupported\n",
659 StringDesc->String.Pointer, ReturnValue == 0 ? "not " : ""));
660
661 /* Complete the return object */
662
663 ReturnDesc->Integer.Value = ReturnValue;
664 WalkState->ReturnDesc = ReturnDesc;
665 return_ACPI_STATUS (AE_OK);
666 }
667
