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 - 2018, 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}, /* 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 */ 220 221 /* Feature Group Strings */ 222 223 {"Extended Address Space Descriptor", NULL, ACPI_OSI_FEATURE, 0}, 224 225 /* 226 * All "optional" feature group strings (features that are implemented 227 * by the host) should be dynamically modified to VALID by the host via 228 * AcpiInstallInterface or AcpiUpdateInterfaces. Such optional feature 229 * group strings are set as INVALID by default here. 230 */ 231 232 {"Module Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0}, 233 {"Processor Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0}, 234 {"3.0 Thermal Model", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0}, 235 {"3.0 _SCP Extensions", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0}, 236 {"Processor Aggregator Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0} 237 }; 238 239 240 /******************************************************************************* 241 * 242 * FUNCTION: AcpiUtInitializeInterfaces 243 * 244 * PARAMETERS: None 245 * 246 * RETURN: Status 247 * 248 * DESCRIPTION: Initialize the global _OSI supported interfaces list 249 * 250 ******************************************************************************/ 251 252 ACPI_STATUS 253 AcpiUtInitializeInterfaces ( 254 void) 255 { 256 ACPI_STATUS Status; 257 UINT32 i; 258 259 260 Status = AcpiOsAcquireMutex (AcpiGbl_OsiMutex, ACPI_WAIT_FOREVER); 261 if (ACPI_FAILURE (Status)) 262 { 263 return (Status); 264 } 265 266 AcpiGbl_SupportedInterfaces = AcpiDefaultSupportedInterfaces; 267 268 /* Link the static list of supported interfaces */ 269 270 for (i = 0; 271 i < (ACPI_ARRAY_LENGTH (AcpiDefaultSupportedInterfaces) - 1); 272 i++) 273 { 274 AcpiDefaultSupportedInterfaces[i].Next = 275 &AcpiDefaultSupportedInterfaces[(ACPI_SIZE) i + 1]; 276 } 277 278 AcpiOsReleaseMutex (AcpiGbl_OsiMutex); 279 return (AE_OK); 280 } 281 282 283 /******************************************************************************* 284 * 285 * FUNCTION: AcpiUtInterfaceTerminate 286 * 287 * PARAMETERS: None 288 * 289 * RETURN: Status 290 * 291 * DESCRIPTION: Delete all interfaces in the global list. Sets 292 * AcpiGbl_SupportedInterfaces to NULL. 293 * 294 ******************************************************************************/ 295 296 ACPI_STATUS 297 AcpiUtInterfaceTerminate ( 298 void) 299 { 300 ACPI_STATUS Status; 301 ACPI_INTERFACE_INFO *NextInterface; 302 303 304 Status = AcpiOsAcquireMutex (AcpiGbl_OsiMutex, ACPI_WAIT_FOREVER); 305 if (ACPI_FAILURE (Status)) 306 { 307 return (Status); 308 } 309 310 NextInterface = AcpiGbl_SupportedInterfaces; 311 while (NextInterface) 312 { 313 AcpiGbl_SupportedInterfaces = NextInterface->Next; 314 315 if (NextInterface->Flags & ACPI_OSI_DYNAMIC) 316 { 317 /* Only interfaces added at runtime can be freed */ 318 319 ACPI_FREE (NextInterface->Name); 320 ACPI_FREE (NextInterface); 321 } 322 else 323 { 324 /* Interface is in static list. Reset it to invalid or valid. */ 325 326 if (NextInterface->Flags & ACPI_OSI_DEFAULT_INVALID) 327 { 328 NextInterface->Flags |= ACPI_OSI_INVALID; 329 } 330 else 331 { 332 NextInterface->Flags &= ~ACPI_OSI_INVALID; 333 } 334 } 335 336 NextInterface = AcpiGbl_SupportedInterfaces; 337 } 338 339 AcpiOsReleaseMutex (AcpiGbl_OsiMutex); 340 return (AE_OK); 341 } 342 343 344 /******************************************************************************* 345 * 346 * FUNCTION: AcpiUtInstallInterface 347 * 348 * PARAMETERS: InterfaceName - The interface to install 349 * 350 * RETURN: Status 351 * 352 * DESCRIPTION: Install the interface into the global interface list. 353 * Caller MUST hold AcpiGbl_OsiMutex 354 * 355 ******************************************************************************/ 356 357 ACPI_STATUS 358 AcpiUtInstallInterface ( 359 ACPI_STRING InterfaceName) 360 { 361 ACPI_INTERFACE_INFO *InterfaceInfo; 362 363 364 /* Allocate info block and space for the name string */ 365 366 InterfaceInfo = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_INTERFACE_INFO)); 367 if (!InterfaceInfo) 368 { 369 return (AE_NO_MEMORY); 370 } 371 372 InterfaceInfo->Name = ACPI_ALLOCATE_ZEROED (strlen (InterfaceName) + 1); 373 if (!InterfaceInfo->Name) 374 { 375 ACPI_FREE (InterfaceInfo); 376 return (AE_NO_MEMORY); 377 } 378 379 /* Initialize new info and insert at the head of the global list */ 380 381 strcpy (InterfaceInfo->Name, InterfaceName); 382 InterfaceInfo->Flags = ACPI_OSI_DYNAMIC; 383 InterfaceInfo->Next = AcpiGbl_SupportedInterfaces; 384 385 AcpiGbl_SupportedInterfaces = InterfaceInfo; 386 return (AE_OK); 387 } 388 389 390 /******************************************************************************* 391 * 392 * FUNCTION: AcpiUtRemoveInterface 393 * 394 * PARAMETERS: InterfaceName - The interface to remove 395 * 396 * RETURN: Status 397 * 398 * DESCRIPTION: Remove the interface from the global interface list. 399 * Caller MUST hold AcpiGbl_OsiMutex 400 * 401 ******************************************************************************/ 402 403 ACPI_STATUS 404 AcpiUtRemoveInterface ( 405 ACPI_STRING InterfaceName) 406 { 407 ACPI_INTERFACE_INFO *PreviousInterface; 408 ACPI_INTERFACE_INFO *NextInterface; 409 410 411 PreviousInterface = NextInterface = AcpiGbl_SupportedInterfaces; 412 while (NextInterface) 413 { 414 if (!strcmp (InterfaceName, NextInterface->Name)) 415 { 416 /* 417 * Found: name is in either the static list 418 * or was added at runtime 419 */ 420 if (NextInterface->Flags & ACPI_OSI_DYNAMIC) 421 { 422 /* Interface was added dynamically, remove and free it */ 423 424 if (PreviousInterface == NextInterface) 425 { 426 AcpiGbl_SupportedInterfaces = NextInterface->Next; 427 } 428 else 429 { 430 PreviousInterface->Next = NextInterface->Next; 431 } 432 433 ACPI_FREE (NextInterface->Name); 434 ACPI_FREE (NextInterface); 435 } 436 else 437 { 438 /* 439 * Interface is in static list. If marked invalid, then 440 * it does not actually exist. Else, mark it invalid. 441 */ 442 if (NextInterface->Flags & ACPI_OSI_INVALID) 443 { 444 return (AE_NOT_EXIST); 445 } 446 447 NextInterface->Flags |= ACPI_OSI_INVALID; 448 } 449 450 return (AE_OK); 451 } 452 453 PreviousInterface = NextInterface; 454 NextInterface = NextInterface->Next; 455 } 456 457 /* Interface was not found */ 458 459 return (AE_NOT_EXIST); 460 } 461 462 463 /******************************************************************************* 464 * 465 * FUNCTION: AcpiUtUpdateInterfaces 466 * 467 * PARAMETERS: Action - Actions to be performed during the 468 * update 469 * 470 * RETURN: Status 471 * 472 * DESCRIPTION: Update _OSI interface strings, disabling or enabling OS vendor 473 * strings or/and feature group strings. 474 * Caller MUST hold AcpiGbl_OsiMutex 475 * 476 ******************************************************************************/ 477 478 ACPI_STATUS 479 AcpiUtUpdateInterfaces ( 480 UINT8 Action) 481 { 482 ACPI_INTERFACE_INFO *NextInterface; 483 484 485 NextInterface = AcpiGbl_SupportedInterfaces; 486 while (NextInterface) 487 { 488 if (((NextInterface->Flags & ACPI_OSI_FEATURE) && 489 (Action & ACPI_FEATURE_STRINGS)) || 490 (!(NextInterface->Flags & ACPI_OSI_FEATURE) && 491 (Action & ACPI_VENDOR_STRINGS))) 492 { 493 if (Action & ACPI_DISABLE_INTERFACES) 494 { 495 /* Mark the interfaces as invalid */ 496 497 NextInterface->Flags |= ACPI_OSI_INVALID; 498 } 499 else 500 { 501 /* Mark the interfaces as valid */ 502 503 NextInterface->Flags &= ~ACPI_OSI_INVALID; 504 } 505 } 506 507 NextInterface = NextInterface->Next; 508 } 509 510 return (AE_OK); 511 } 512 513 514 /******************************************************************************* 515 * 516 * FUNCTION: AcpiUtGetInterface 517 * 518 * PARAMETERS: InterfaceName - The interface to find 519 * 520 * RETURN: ACPI_INTERFACE_INFO if found. NULL if not found. 521 * 522 * DESCRIPTION: Search for the specified interface name in the global list. 523 * Caller MUST hold AcpiGbl_OsiMutex 524 * 525 ******************************************************************************/ 526 527 ACPI_INTERFACE_INFO * 528 AcpiUtGetInterface ( 529 ACPI_STRING InterfaceName) 530 { 531 ACPI_INTERFACE_INFO *NextInterface; 532 533 534 NextInterface = AcpiGbl_SupportedInterfaces; 535 while (NextInterface) 536 { 537 if (!strcmp (InterfaceName, NextInterface->Name)) 538 { 539 return (NextInterface); 540 } 541 542 NextInterface = NextInterface->Next; 543 } 544 545 return (NULL); 546 } 547 548 549 /******************************************************************************* 550 * 551 * FUNCTION: AcpiUtOsiImplementation 552 * 553 * PARAMETERS: WalkState - Current walk state 554 * 555 * RETURN: Status 556 * Integer: TRUE (0) if input string is matched 557 * FALSE (-1) if string is not matched 558 * 559 * DESCRIPTION: Implementation of the _OSI predefined control method. When 560 * an invocation of _OSI is encountered in the system AML, 561 * control is transferred to this function. 562 * 563 * (August 2016) 564 * Note: _OSI is now defined to return "Ones" to indicate a match, for 565 * compatibility with other ACPI implementations. On a 32-bit DSDT, Ones 566 * is 0xFFFFFFFF. On a 64-bit DSDT, Ones is 0xFFFFFFFFFFFFFFFF 567 * (ACPI_UINT64_MAX). 568 * 569 * This function always returns ACPI_UINT64_MAX for TRUE, and later code 570 * will truncate this to 32 bits if necessary. 571 * 572 ******************************************************************************/ 573 574 ACPI_STATUS 575 AcpiUtOsiImplementation ( 576 ACPI_WALK_STATE *WalkState) 577 { 578 ACPI_OPERAND_OBJECT *StringDesc; 579 ACPI_OPERAND_OBJECT *ReturnDesc; 580 ACPI_INTERFACE_INFO *InterfaceInfo; 581 ACPI_INTERFACE_HANDLER InterfaceHandler; 582 ACPI_STATUS Status; 583 UINT64 ReturnValue; 584 585 586 ACPI_FUNCTION_TRACE (UtOsiImplementation); 587 588 589 /* Validate the string input argument (from the AML caller) */ 590 591 StringDesc = WalkState->Arguments[0].Object; 592 if (!StringDesc || 593 (StringDesc->Common.Type != ACPI_TYPE_STRING)) 594 { 595 return_ACPI_STATUS (AE_TYPE); 596 } 597 598 /* Create a return object */ 599 600 ReturnDesc = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER); 601 if (!ReturnDesc) 602 { 603 return_ACPI_STATUS (AE_NO_MEMORY); 604 } 605 606 /* Default return value is 0, NOT SUPPORTED */ 607 608 ReturnValue = 0; 609 Status = AcpiOsAcquireMutex (AcpiGbl_OsiMutex, ACPI_WAIT_FOREVER); 610 if (ACPI_FAILURE (Status)) 611 { 612 AcpiUtRemoveReference (ReturnDesc); 613 return_ACPI_STATUS (Status); 614 } 615 616 /* Lookup the interface in the global _OSI list */ 617 618 InterfaceInfo = AcpiUtGetInterface (StringDesc->String.Pointer); 619 if (InterfaceInfo && 620 !(InterfaceInfo->Flags & ACPI_OSI_INVALID)) 621 { 622 /* 623 * The interface is supported. 624 * Update the OsiData if necessary. We keep track of the latest 625 * version of Windows that has been requested by the BIOS. 626 */ 627 if (InterfaceInfo->Value > AcpiGbl_OsiData) 628 { 629 AcpiGbl_OsiData = InterfaceInfo->Value; 630 } 631 632 ReturnValue = ACPI_UINT64_MAX; 633 } 634 635 AcpiOsReleaseMutex (AcpiGbl_OsiMutex); 636 637 /* 638 * Invoke an optional _OSI interface handler. The host OS may wish 639 * to do some interface-specific handling. For example, warn about 640 * certain interfaces or override the true/false support value. 641 */ 642 InterfaceHandler = AcpiGbl_InterfaceHandler; 643 if (InterfaceHandler) 644 { 645 if (InterfaceHandler ( 646 StringDesc->String.Pointer, (UINT32) ReturnValue)) 647 { 648 ReturnValue = ACPI_UINT64_MAX; 649 } 650 } 651 652 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INFO, 653 "ACPI: BIOS _OSI(\"%s\") is %ssupported\n", 654 StringDesc->String.Pointer, ReturnValue == 0 ? "not " : "")); 655 656 /* Complete the return object */ 657 658 ReturnDesc->Integer.Value = ReturnValue; 659 WalkState->ReturnDesc = ReturnDesc; 660 return_ACPI_STATUS (AE_OK); 661 } 662