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 */ 199static 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 257ACPI_STATUS 258AcpiUtInitializeInterfaces ( 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 301ACPI_STATUS 302AcpiUtInterfaceTerminate ( 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 362ACPI_STATUS 363AcpiUtInstallInterface ( 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 408ACPI_STATUS 409AcpiUtRemoveInterface ( 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 483ACPI_STATUS 484AcpiUtUpdateInterfaces ( 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 532ACPI_INTERFACE_INFO * 533AcpiUtGetInterface ( 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 579ACPI_STATUS 580AcpiUtOsiImplementation ( 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