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 - 2017, 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
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}, /* 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
220 /* Feature Group Strings */
221
222 {"Extended Address Space Descriptor", NULL, ACPI_OSI_FEATURE, 0},
223
224 /*
225 * All "optional" feature group strings (features that are implemented
226 * by the host) should be dynamically modified to VALID by the host via
227 * AcpiInstallInterface or AcpiUpdateInterfaces. Such optional feature
228 * group strings are set as INVALID by default here.
229 */
230
231 {"Module Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},
232 {"Processor Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},
233 {"3.0 Thermal Model", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},
234 {"3.0 _SCP Extensions", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0},
235 {"Processor Aggregator Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0}
236 };
237
238
239 /*******************************************************************************
240 *
241 * FUNCTION: AcpiUtInitializeInterfaces
242 *
243 * PARAMETERS: None
244 *
245 * RETURN: Status
246 *
247 * DESCRIPTION: Initialize the global _OSI supported interfaces list
248 *
249 ******************************************************************************/
250
251 ACPI_STATUS
AcpiUtInitializeInterfaces(void)252 AcpiUtInitializeInterfaces (
253 void)
254 {
255 ACPI_STATUS Status;
256 UINT32 i;
257
258
259 Status = AcpiOsAcquireMutex (AcpiGbl_OsiMutex, ACPI_WAIT_FOREVER);
260 if (ACPI_FAILURE (Status))
261 {
262 return (Status);
263 }
264
265 AcpiGbl_SupportedInterfaces = AcpiDefaultSupportedInterfaces;
266
267 /* Link the static list of supported interfaces */
268
269 for (i = 0;
270 i < (ACPI_ARRAY_LENGTH (AcpiDefaultSupportedInterfaces) - 1);
271 i++)
272 {
273 AcpiDefaultSupportedInterfaces[i].Next =
274 &AcpiDefaultSupportedInterfaces[(ACPI_SIZE) i + 1];
275 }
276
277 AcpiOsReleaseMutex (AcpiGbl_OsiMutex);
278 return (AE_OK);
279 }
280
281
282 /*******************************************************************************
283 *
284 * FUNCTION: AcpiUtInterfaceTerminate
285 *
286 * PARAMETERS: None
287 *
288 * RETURN: Status
289 *
290 * DESCRIPTION: Delete all interfaces in the global list. Sets
291 * AcpiGbl_SupportedInterfaces to NULL.
292 *
293 ******************************************************************************/
294
295 ACPI_STATUS
AcpiUtInterfaceTerminate(void)296 AcpiUtInterfaceTerminate (
297 void)
298 {
299 ACPI_STATUS Status;
300 ACPI_INTERFACE_INFO *NextInterface;
301
302
303 Status = AcpiOsAcquireMutex (AcpiGbl_OsiMutex, ACPI_WAIT_FOREVER);
304 if (ACPI_FAILURE (Status))
305 {
306 return (Status);
307 }
308
309 NextInterface = AcpiGbl_SupportedInterfaces;
310 while (NextInterface)
311 {
312 AcpiGbl_SupportedInterfaces = NextInterface->Next;
313
314 if (NextInterface->Flags & ACPI_OSI_DYNAMIC)
315 {
316 /* Only interfaces added at runtime can be freed */
317
318 ACPI_FREE (NextInterface->Name);
319 ACPI_FREE (NextInterface);
320 }
321 else
322 {
323 /* Interface is in static list. Reset it to invalid or valid. */
324
325 if (NextInterface->Flags & ACPI_OSI_DEFAULT_INVALID)
326 {
327 NextInterface->Flags |= ACPI_OSI_INVALID;
328 }
329 else
330 {
331 NextInterface->Flags &= ~ACPI_OSI_INVALID;
332 }
333 }
334
335 NextInterface = AcpiGbl_SupportedInterfaces;
336 }
337
338 AcpiOsReleaseMutex (AcpiGbl_OsiMutex);
339 return (AE_OK);
340 }
341
342
343 /*******************************************************************************
344 *
345 * FUNCTION: AcpiUtInstallInterface
346 *
347 * PARAMETERS: InterfaceName - The interface to install
348 *
349 * RETURN: Status
350 *
351 * DESCRIPTION: Install the interface into the global interface list.
352 * Caller MUST hold AcpiGbl_OsiMutex
353 *
354 ******************************************************************************/
355
356 ACPI_STATUS
AcpiUtInstallInterface(ACPI_STRING InterfaceName)357 AcpiUtInstallInterface (
358 ACPI_STRING InterfaceName)
359 {
360 ACPI_INTERFACE_INFO *InterfaceInfo;
361
362
363 /* Allocate info block and space for the name string */
364
365 InterfaceInfo = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_INTERFACE_INFO));
366 if (!InterfaceInfo)
367 {
368 return (AE_NO_MEMORY);
369 }
370
371 InterfaceInfo->Name = ACPI_ALLOCATE_ZEROED (strlen (InterfaceName) + 1);
372 if (!InterfaceInfo->Name)
373 {
374 ACPI_FREE (InterfaceInfo);
375 return (AE_NO_MEMORY);
376 }
377
378 /* Initialize new info and insert at the head of the global list */
379
380 strcpy (InterfaceInfo->Name, InterfaceName);
381 InterfaceInfo->Flags = ACPI_OSI_DYNAMIC;
382 InterfaceInfo->Next = AcpiGbl_SupportedInterfaces;
383
384 AcpiGbl_SupportedInterfaces = InterfaceInfo;
385 return (AE_OK);
386 }
387
388
389 /*******************************************************************************
390 *
391 * FUNCTION: AcpiUtRemoveInterface
392 *
393 * PARAMETERS: InterfaceName - The interface to remove
394 *
395 * RETURN: Status
396 *
397 * DESCRIPTION: Remove the interface from the global interface list.
398 * Caller MUST hold AcpiGbl_OsiMutex
399 *
400 ******************************************************************************/
401
402 ACPI_STATUS
AcpiUtRemoveInterface(ACPI_STRING InterfaceName)403 AcpiUtRemoveInterface (
404 ACPI_STRING InterfaceName)
405 {
406 ACPI_INTERFACE_INFO *PreviousInterface;
407 ACPI_INTERFACE_INFO *NextInterface;
408
409
410 PreviousInterface = NextInterface = AcpiGbl_SupportedInterfaces;
411 while (NextInterface)
412 {
413 if (!strcmp (InterfaceName, NextInterface->Name))
414 {
415 /*
416 * Found: name is in either the static list
417 * or was added at runtime
418 */
419 if (NextInterface->Flags & ACPI_OSI_DYNAMIC)
420 {
421 /* Interface was added dynamically, remove and free it */
422
423 if (PreviousInterface == NextInterface)
424 {
425 AcpiGbl_SupportedInterfaces = NextInterface->Next;
426 }
427 else
428 {
429 PreviousInterface->Next = NextInterface->Next;
430 }
431
432 ACPI_FREE (NextInterface->Name);
433 ACPI_FREE (NextInterface);
434 }
435 else
436 {
437 /*
438 * Interface is in static list. If marked invalid, then
439 * it does not actually exist. Else, mark it invalid.
440 */
441 if (NextInterface->Flags & ACPI_OSI_INVALID)
442 {
443 return (AE_NOT_EXIST);
444 }
445
446 NextInterface->Flags |= ACPI_OSI_INVALID;
447 }
448
449 return (AE_OK);
450 }
451
452 PreviousInterface = NextInterface;
453 NextInterface = NextInterface->Next;
454 }
455
456 /* Interface was not found */
457
458 return (AE_NOT_EXIST);
459 }
460
461
462 /*******************************************************************************
463 *
464 * FUNCTION: AcpiUtUpdateInterfaces
465 *
466 * PARAMETERS: Action - Actions to be performed during the
467 * update
468 *
469 * RETURN: Status
470 *
471 * DESCRIPTION: Update _OSI interface strings, disabling or enabling OS vendor
472 * strings or/and feature group strings.
473 * Caller MUST hold AcpiGbl_OsiMutex
474 *
475 ******************************************************************************/
476
477 ACPI_STATUS
AcpiUtUpdateInterfaces(UINT8 Action)478 AcpiUtUpdateInterfaces (
479 UINT8 Action)
480 {
481 ACPI_INTERFACE_INFO *NextInterface;
482
483
484 NextInterface = AcpiGbl_SupportedInterfaces;
485 while (NextInterface)
486 {
487 if (((NextInterface->Flags & ACPI_OSI_FEATURE) &&
488 (Action & ACPI_FEATURE_STRINGS)) ||
489 (!(NextInterface->Flags & ACPI_OSI_FEATURE) &&
490 (Action & ACPI_VENDOR_STRINGS)))
491 {
492 if (Action & ACPI_DISABLE_INTERFACES)
493 {
494 /* Mark the interfaces as invalid */
495
496 NextInterface->Flags |= ACPI_OSI_INVALID;
497 }
498 else
499 {
500 /* Mark the interfaces as valid */
501
502 NextInterface->Flags &= ~ACPI_OSI_INVALID;
503 }
504 }
505
506 NextInterface = NextInterface->Next;
507 }
508
509 return (AE_OK);
510 }
511
512
513 /*******************************************************************************
514 *
515 * FUNCTION: AcpiUtGetInterface
516 *
517 * PARAMETERS: InterfaceName - The interface to find
518 *
519 * RETURN: ACPI_INTERFACE_INFO if found. NULL if not found.
520 *
521 * DESCRIPTION: Search for the specified interface name in the global list.
522 * Caller MUST hold AcpiGbl_OsiMutex
523 *
524 ******************************************************************************/
525
526 ACPI_INTERFACE_INFO *
AcpiUtGetInterface(ACPI_STRING InterfaceName)527 AcpiUtGetInterface (
528 ACPI_STRING InterfaceName)
529 {
530 ACPI_INTERFACE_INFO *NextInterface;
531
532
533 NextInterface = AcpiGbl_SupportedInterfaces;
534 while (NextInterface)
535 {
536 if (!strcmp (InterfaceName, NextInterface->Name))
537 {
538 return (NextInterface);
539 }
540
541 NextInterface = NextInterface->Next;
542 }
543
544 return (NULL);
545 }
546
547
548 /*******************************************************************************
549 *
550 * FUNCTION: AcpiUtOsiImplementation
551 *
552 * PARAMETERS: WalkState - Current walk state
553 *
554 * RETURN: Status
555 * Integer: TRUE (0) if input string is matched
556 * FALSE (-1) if string is not matched
557 *
558 * DESCRIPTION: Implementation of the _OSI predefined control method. When
559 * an invocation of _OSI is encountered in the system AML,
560 * control is transferred to this function.
561 *
562 * (August 2016)
563 * Note: _OSI is now defined to return "Ones" to indicate a match, for
564 * compatibility with other ACPI implementations. On a 32-bit DSDT, Ones
565 * is 0xFFFFFFFF. On a 64-bit DSDT, Ones is 0xFFFFFFFFFFFFFFFF
566 * (ACPI_UINT64_MAX).
567 *
568 * This function always returns ACPI_UINT64_MAX for TRUE, and later code
569 * will truncate this to 32 bits if necessary.
570 *
571 ******************************************************************************/
572
573 ACPI_STATUS
AcpiUtOsiImplementation(ACPI_WALK_STATE * WalkState)574 AcpiUtOsiImplementation (
575 ACPI_WALK_STATE *WalkState)
576 {
577 ACPI_OPERAND_OBJECT *StringDesc;
578 ACPI_OPERAND_OBJECT *ReturnDesc;
579 ACPI_INTERFACE_INFO *InterfaceInfo;
580 ACPI_INTERFACE_HANDLER InterfaceHandler;
581 ACPI_STATUS Status;
582 UINT64 ReturnValue;
583
584
585 ACPI_FUNCTION_TRACE (UtOsiImplementation);
586
587
588 /* Validate the string input argument (from the AML caller) */
589
590 StringDesc = WalkState->Arguments[0].Object;
591 if (!StringDesc ||
592 (StringDesc->Common.Type != ACPI_TYPE_STRING))
593 {
594 return_ACPI_STATUS (AE_TYPE);
595 }
596
597 /* Create a return object */
598
599 ReturnDesc = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER);
600 if (!ReturnDesc)
601 {
602 return_ACPI_STATUS (AE_NO_MEMORY);
603 }
604
605 /* Default return value is 0, NOT SUPPORTED */
606
607 ReturnValue = 0;
608 Status = AcpiOsAcquireMutex (AcpiGbl_OsiMutex, ACPI_WAIT_FOREVER);
609 if (ACPI_FAILURE (Status))
610 {
611 AcpiUtRemoveReference (ReturnDesc);
612 return_ACPI_STATUS (Status);
613 }
614
615 /* Lookup the interface in the global _OSI list */
616
617 InterfaceInfo = AcpiUtGetInterface (StringDesc->String.Pointer);
618 if (InterfaceInfo &&
619 !(InterfaceInfo->Flags & ACPI_OSI_INVALID))
620 {
621 /*
622 * The interface is supported.
623 * Update the OsiData if necessary. We keep track of the latest
624 * version of Windows that has been requested by the BIOS.
625 */
626 if (InterfaceInfo->Value > AcpiGbl_OsiData)
627 {
628 AcpiGbl_OsiData = InterfaceInfo->Value;
629 }
630
631 ReturnValue = ACPI_UINT64_MAX;
632 }
633
634 AcpiOsReleaseMutex (AcpiGbl_OsiMutex);
635
636 /*
637 * Invoke an optional _OSI interface handler. The host OS may wish
638 * to do some interface-specific handling. For example, warn about
639 * certain interfaces or override the true/false support value.
640 */
641 InterfaceHandler = AcpiGbl_InterfaceHandler;
642 if (InterfaceHandler)
643 {
644 if (InterfaceHandler (
645 StringDesc->String.Pointer, (UINT32) ReturnValue))
646 {
647 ReturnValue = ACPI_UINT64_MAX;
648 }
649 }
650
651 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INFO,
652 "ACPI: BIOS _OSI(\"%s\") is %ssupported\n",
653 StringDesc->String.Pointer, ReturnValue == 0 ? "not " : ""));
654
655 /* Complete the return object */
656
657 ReturnDesc->Integer.Value = ReturnValue;
658 WalkState->ReturnDesc = ReturnDesc;
659 return_ACPI_STATUS (AE_OK);
660 }
661