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 */ 217 218 /* Feature Group Strings */ 219 220 {"Extended Address Space Descriptor", NULL, ACPI_OSI_FEATURE, 0}, 221 222 /* 223 * All "optional" feature group strings (features that are implemented 224 * by the host) should be dynamically modified to VALID by the host via 225 * AcpiInstallInterface or AcpiUpdateInterfaces. Such optional feature 226 * group strings are set as INVALID by default here. 227 */ 228 229 {"Module Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0}, 230 {"Processor Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0}, 231 {"3.0 Thermal Model", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0}, 232 {"3.0 _SCP Extensions", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0}, 233 {"Processor Aggregator Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0} 234 }; 235 236 237 /******************************************************************************* 238 * 239 * FUNCTION: AcpiUtInitializeInterfaces 240 * 241 * PARAMETERS: None 242 * 243 * RETURN: Status 244 * 245 * DESCRIPTION: Initialize the global _OSI supported interfaces list 246 * 247 ******************************************************************************/ 248 249 ACPI_STATUS 250 AcpiUtInitializeInterfaces ( 251 void) 252 { 253 ACPI_STATUS Status; 254 UINT32 i; 255 256 257 Status = AcpiOsAcquireMutex (AcpiGbl_OsiMutex, ACPI_WAIT_FOREVER); 258 if (ACPI_FAILURE (Status)) 259 { 260 return (Status); 261 } 262 263 AcpiGbl_SupportedInterfaces = AcpiDefaultSupportedInterfaces; 264 265 /* Link the static list of supported interfaces */ 266 267 for (i = 0; 268 i < (ACPI_ARRAY_LENGTH (AcpiDefaultSupportedInterfaces) - 1); 269 i++) 270 { 271 AcpiDefaultSupportedInterfaces[i].Next = 272 &AcpiDefaultSupportedInterfaces[(ACPI_SIZE) i + 1]; 273 } 274 275 AcpiOsReleaseMutex (AcpiGbl_OsiMutex); 276 return (AE_OK); 277 } 278 279 280 /******************************************************************************* 281 * 282 * FUNCTION: AcpiUtInterfaceTerminate 283 * 284 * PARAMETERS: None 285 * 286 * RETURN: Status 287 * 288 * DESCRIPTION: Delete all interfaces in the global list. Sets 289 * AcpiGbl_SupportedInterfaces to NULL. 290 * 291 ******************************************************************************/ 292 293 ACPI_STATUS 294 AcpiUtInterfaceTerminate ( 295 void) 296 { 297 ACPI_STATUS Status; 298 ACPI_INTERFACE_INFO *NextInterface; 299 300 301 Status = AcpiOsAcquireMutex (AcpiGbl_OsiMutex, ACPI_WAIT_FOREVER); 302 if (ACPI_FAILURE (Status)) 303 { 304 return (Status); 305 } 306 307 NextInterface = AcpiGbl_SupportedInterfaces; 308 while (NextInterface) 309 { 310 AcpiGbl_SupportedInterfaces = NextInterface->Next; 311 312 if (NextInterface->Flags & ACPI_OSI_DYNAMIC) 313 { 314 /* Only interfaces added at runtime can be freed */ 315 316 ACPI_FREE (NextInterface->Name); 317 ACPI_FREE (NextInterface); 318 } 319 else 320 { 321 /* Interface is in static list. Reset it to invalid or valid. */ 322 323 if (NextInterface->Flags & ACPI_OSI_DEFAULT_INVALID) 324 { 325 NextInterface->Flags |= ACPI_OSI_INVALID; 326 } 327 else 328 { 329 NextInterface->Flags &= ~ACPI_OSI_INVALID; 330 } 331 } 332 333 NextInterface = AcpiGbl_SupportedInterfaces; 334 } 335 336 AcpiOsReleaseMutex (AcpiGbl_OsiMutex); 337 return (AE_OK); 338 } 339 340 341 /******************************************************************************* 342 * 343 * FUNCTION: AcpiUtInstallInterface 344 * 345 * PARAMETERS: InterfaceName - The interface to install 346 * 347 * RETURN: Status 348 * 349 * DESCRIPTION: Install the interface into the global interface list. 350 * Caller MUST hold AcpiGbl_OsiMutex 351 * 352 ******************************************************************************/ 353 354 ACPI_STATUS 355 AcpiUtInstallInterface ( 356 ACPI_STRING InterfaceName) 357 { 358 ACPI_INTERFACE_INFO *InterfaceInfo; 359 360 361 /* Allocate info block and space for the name string */ 362 363 InterfaceInfo = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_INTERFACE_INFO)); 364 if (!InterfaceInfo) 365 { 366 return (AE_NO_MEMORY); 367 } 368 369 InterfaceInfo->Name = ACPI_ALLOCATE_ZEROED (strlen (InterfaceName) + 1); 370 if (!InterfaceInfo->Name) 371 { 372 ACPI_FREE (InterfaceInfo); 373 return (AE_NO_MEMORY); 374 } 375 376 /* Initialize new info and insert at the head of the global list */ 377 378 strcpy (InterfaceInfo->Name, InterfaceName); 379 InterfaceInfo->Flags = ACPI_OSI_DYNAMIC; 380 InterfaceInfo->Next = AcpiGbl_SupportedInterfaces; 381 382 AcpiGbl_SupportedInterfaces = InterfaceInfo; 383 return (AE_OK); 384 } 385 386 387 /******************************************************************************* 388 * 389 * FUNCTION: AcpiUtRemoveInterface 390 * 391 * PARAMETERS: InterfaceName - The interface to remove 392 * 393 * RETURN: Status 394 * 395 * DESCRIPTION: Remove the interface from the global interface list. 396 * Caller MUST hold AcpiGbl_OsiMutex 397 * 398 ******************************************************************************/ 399 400 ACPI_STATUS 401 AcpiUtRemoveInterface ( 402 ACPI_STRING InterfaceName) 403 { 404 ACPI_INTERFACE_INFO *PreviousInterface; 405 ACPI_INTERFACE_INFO *NextInterface; 406 407 408 PreviousInterface = NextInterface = AcpiGbl_SupportedInterfaces; 409 while (NextInterface) 410 { 411 if (!strcmp (InterfaceName, NextInterface->Name)) 412 { 413 /* 414 * Found: name is in either the static list 415 * or was added at runtime 416 */ 417 if (NextInterface->Flags & ACPI_OSI_DYNAMIC) 418 { 419 /* Interface was added dynamically, remove and free it */ 420 421 if (PreviousInterface == NextInterface) 422 { 423 AcpiGbl_SupportedInterfaces = NextInterface->Next; 424 } 425 else 426 { 427 PreviousInterface->Next = NextInterface->Next; 428 } 429 430 ACPI_FREE (NextInterface->Name); 431 ACPI_FREE (NextInterface); 432 } 433 else 434 { 435 /* 436 * Interface is in static list. If marked invalid, then 437 * it does not actually exist. Else, mark it invalid. 438 */ 439 if (NextInterface->Flags & ACPI_OSI_INVALID) 440 { 441 return (AE_NOT_EXIST); 442 } 443 444 NextInterface->Flags |= ACPI_OSI_INVALID; 445 } 446 447 return (AE_OK); 448 } 449 450 PreviousInterface = NextInterface; 451 NextInterface = NextInterface->Next; 452 } 453 454 /* Interface was not found */ 455 456 return (AE_NOT_EXIST); 457 } 458 459 460 /******************************************************************************* 461 * 462 * FUNCTION: AcpiUtUpdateInterfaces 463 * 464 * PARAMETERS: Action - Actions to be performed during the 465 * update 466 * 467 * RETURN: Status 468 * 469 * DESCRIPTION: Update _OSI interface strings, disabling or enabling OS vendor 470 * strings or/and feature group strings. 471 * Caller MUST hold AcpiGbl_OsiMutex 472 * 473 ******************************************************************************/ 474 475 ACPI_STATUS 476 AcpiUtUpdateInterfaces ( 477 UINT8 Action) 478 { 479 ACPI_INTERFACE_INFO *NextInterface; 480 481 482 NextInterface = AcpiGbl_SupportedInterfaces; 483 while (NextInterface) 484 { 485 if (((NextInterface->Flags & ACPI_OSI_FEATURE) && 486 (Action & ACPI_FEATURE_STRINGS)) || 487 (!(NextInterface->Flags & ACPI_OSI_FEATURE) && 488 (Action & ACPI_VENDOR_STRINGS))) 489 { 490 if (Action & ACPI_DISABLE_INTERFACES) 491 { 492 /* Mark the interfaces as invalid */ 493 494 NextInterface->Flags |= ACPI_OSI_INVALID; 495 } 496 else 497 { 498 /* Mark the interfaces as valid */ 499 500 NextInterface->Flags &= ~ACPI_OSI_INVALID; 501 } 502 } 503 504 NextInterface = NextInterface->Next; 505 } 506 507 return (AE_OK); 508 } 509 510 511 /******************************************************************************* 512 * 513 * FUNCTION: AcpiUtGetInterface 514 * 515 * PARAMETERS: InterfaceName - The interface to find 516 * 517 * RETURN: ACPI_INTERFACE_INFO if found. NULL if not found. 518 * 519 * DESCRIPTION: Search for the specified interface name in the global list. 520 * Caller MUST hold AcpiGbl_OsiMutex 521 * 522 ******************************************************************************/ 523 524 ACPI_INTERFACE_INFO * 525 AcpiUtGetInterface ( 526 ACPI_STRING InterfaceName) 527 { 528 ACPI_INTERFACE_INFO *NextInterface; 529 530 531 NextInterface = AcpiGbl_SupportedInterfaces; 532 while (NextInterface) 533 { 534 if (!strcmp (InterfaceName, NextInterface->Name)) 535 { 536 return (NextInterface); 537 } 538 539 NextInterface = NextInterface->Next; 540 } 541 542 return (NULL); 543 } 544 545 546 /******************************************************************************* 547 * 548 * FUNCTION: AcpiUtOsiImplementation 549 * 550 * PARAMETERS: WalkState - Current walk state 551 * 552 * RETURN: Status 553 * Integer: TRUE (0) if input string is matched 554 * FALSE (-1) if string is not matched 555 * 556 * DESCRIPTION: Implementation of the _OSI predefined control method. When 557 * an invocation of _OSI is encountered in the system AML, 558 * control is transferred to this function. 559 * 560 * (August 2016) 561 * Note: _OSI is now defined to return "Ones" to indicate a match, for 562 * compatibility with other ACPI implementations. On a 32-bit DSDT, Ones 563 * is 0xFFFFFFFF. On a 64-bit DSDT, Ones is 0xFFFFFFFFFFFFFFFF 564 * (ACPI_UINT64_MAX). 565 * 566 * This function always returns ACPI_UINT64_MAX for TRUE, and later code 567 * will truncate this to 32 bits if necessary. 568 * 569 ******************************************************************************/ 570 571 ACPI_STATUS 572 AcpiUtOsiImplementation ( 573 ACPI_WALK_STATE *WalkState) 574 { 575 ACPI_OPERAND_OBJECT *StringDesc; 576 ACPI_OPERAND_OBJECT *ReturnDesc; 577 ACPI_INTERFACE_INFO *InterfaceInfo; 578 ACPI_INTERFACE_HANDLER InterfaceHandler; 579 ACPI_STATUS Status; 580 UINT64 ReturnValue; 581 582 583 ACPI_FUNCTION_TRACE (UtOsiImplementation); 584 585 586 /* Validate the string input argument (from the AML caller) */ 587 588 StringDesc = WalkState->Arguments[0].Object; 589 if (!StringDesc || 590 (StringDesc->Common.Type != ACPI_TYPE_STRING)) 591 { 592 return_ACPI_STATUS (AE_TYPE); 593 } 594 595 /* Create a return object */ 596 597 ReturnDesc = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER); 598 if (!ReturnDesc) 599 { 600 return_ACPI_STATUS (AE_NO_MEMORY); 601 } 602 603 /* Default return value is 0, NOT SUPPORTED */ 604 605 ReturnValue = 0; 606 Status = AcpiOsAcquireMutex (AcpiGbl_OsiMutex, ACPI_WAIT_FOREVER); 607 if (ACPI_FAILURE (Status)) 608 { 609 AcpiUtRemoveReference (ReturnDesc); 610 return_ACPI_STATUS (Status); 611 } 612 613 /* Lookup the interface in the global _OSI list */ 614 615 InterfaceInfo = AcpiUtGetInterface (StringDesc->String.Pointer); 616 if (InterfaceInfo && 617 !(InterfaceInfo->Flags & ACPI_OSI_INVALID)) 618 { 619 /* 620 * The interface is supported. 621 * Update the OsiData if necessary. We keep track of the latest 622 * version of Windows that has been requested by the BIOS. 623 */ 624 if (InterfaceInfo->Value > AcpiGbl_OsiData) 625 { 626 AcpiGbl_OsiData = InterfaceInfo->Value; 627 } 628 629 ReturnValue = ACPI_UINT64_MAX; 630 } 631 632 AcpiOsReleaseMutex (AcpiGbl_OsiMutex); 633 634 /* 635 * Invoke an optional _OSI interface handler. The host OS may wish 636 * to do some interface-specific handling. For example, warn about 637 * certain interfaces or override the true/false support value. 638 */ 639 InterfaceHandler = AcpiGbl_InterfaceHandler; 640 if (InterfaceHandler) 641 { 642 if (InterfaceHandler ( 643 StringDesc->String.Pointer, (UINT32) ReturnValue)) 644 { 645 ReturnValue = ACPI_UINT64_MAX; 646 } 647 } 648 649 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INFO, 650 "ACPI: BIOS _OSI(\"%s\") is %ssupported\n", 651 StringDesc->String.Pointer, ReturnValue == 0 ? "not " : "")); 652 653 /* Complete the return object */ 654 655 ReturnDesc->Integer.Value = ReturnValue; 656 WalkState->ReturnDesc = ReturnDesc; 657 return_ACPI_STATUS (AE_OK); 658 } 659