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 - 2021, Intel Corp. 12 * All rights reserved. 13 * 14 * 2. License 15 * 16 * 2.1. This is your license from Intel Corp. under its intellectual property 17 * rights. You may have additional license terms from the party that provided 18 * you this software, covering your right to use that party's intellectual 19 * property rights. 20 * 21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 22 * copy of the source code appearing in this file ("Covered Code") an 23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 24 * base code distributed originally by Intel ("Original Intel Code") to copy, 25 * make derivatives, distribute, use and display any portion of the Covered 26 * Code in any form, with the right to sublicense such rights; and 27 * 28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 29 * license (with the right to sublicense), under only those claims of Intel 30 * patents that are infringed by the Original Intel Code, to make, use, sell, 31 * offer to sell, and import the Covered Code and derivative works thereof 32 * solely to the minimum extent necessary to exercise the above copyright 33 * license, and in no event shall the patent license extend to any additions 34 * to or modifications of the Original Intel Code. No other license or right 35 * is granted directly or by implication, estoppel or otherwise; 36 * 37 * The above copyright and patent license is granted only if the following 38 * conditions are met: 39 * 40 * 3. Conditions 41 * 42 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 43 * Redistribution of source code of any substantial portion of the Covered 44 * Code or modification with rights to further distribute source must include 45 * the above Copyright Notice, the above License, this list of Conditions, 46 * and the following Disclaimer and Export Compliance provision. In addition, 47 * Licensee must cause all Covered Code to which Licensee contributes to 48 * contain a file documenting the changes Licensee made to create that Covered 49 * Code and the date of any change. Licensee must include in that file the 50 * documentation of any changes made by any predecessor Licensee. Licensee 51 * must include a prominent statement that the modification is derived, 52 * directly or indirectly, from Original Intel Code. 53 * 54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 55 * Redistribution of source code of any substantial portion of the Covered 56 * Code or modification without rights to further distribute source must 57 * include the following Disclaimer and Export Compliance provision in the 58 * documentation and/or other materials provided with distribution. In 59 * addition, Licensee may not authorize further sublicense of source of any 60 * portion of the Covered Code, and must include terms to the effect that the 61 * license from Licensee to its licensee is limited to the intellectual 62 * property embodied in the software Licensee provides to its licensee, and 63 * not to intellectual property embodied in modifications its licensee may 64 * make. 65 * 66 * 3.3. Redistribution of Executable. Redistribution in executable form of any 67 * substantial portion of the Covered Code or modification must reproduce the 68 * above Copyright Notice, and the following Disclaimer and Export Compliance 69 * provision in the documentation and/or other materials provided with the 70 * distribution. 71 * 72 * 3.4. Intel retains all right, title, and interest in and to the Original 73 * Intel Code. 74 * 75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 76 * Intel shall be used in advertising or otherwise to promote the sale, use or 77 * other dealings in products derived from or relating to the Covered Code 78 * without prior written authorization from Intel. 79 * 80 * 4. Disclaimer and Export Compliance 81 * 82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 88 * PARTICULAR PURPOSE. 89 * 90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 97 * LIMITED REMEDY. 98 * 99 * 4.3. Licensee shall not export, either directly or indirectly, any of this 100 * software or system incorporating such software without first obtaining any 101 * required license or other approval from the U. S. Department of Commerce or 102 * any other agency or department of the United States Government. In the 103 * event Licensee exports any such software from the United States or 104 * re-exports any such software from a foreign destination, Licensee shall 105 * ensure that the distribution and export/re-export of the software is in 106 * compliance with all laws, regulations, orders, or other restrictions of the 107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 108 * any of its subsidiaries will export/re-export any technical data, process, 109 * software, or service, directly or indirectly, to any country for which the 110 * United States government or any agency thereof requires an export license, 111 * other governmental approval, or letter of assurance, without first obtaining 112 * such license, approval or letter. 113 * 114 ***************************************************************************** 115 * 116 * Alternatively, you may choose to be licensed under the terms of the 117 * following license: 118 * 119 * Redistribution and use in source and binary forms, with or without 120 * modification, are permitted provided that the following conditions 121 * are met: 122 * 1. Redistributions of source code must retain the above copyright 123 * notice, this list of conditions, and the following disclaimer, 124 * without modification. 125 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 126 * substantially similar to the "NO WARRANTY" disclaimer below 127 * ("Disclaimer") and any redistribution must be conditioned upon 128 * including a substantially similar Disclaimer requirement for further 129 * binary redistribution. 130 * 3. Neither the names of the above-listed copyright holders nor the names 131 * of any contributors may be used to endorse or promote products derived 132 * from this software without specific prior written permission. 133 * 134 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 135 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 136 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 137 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 138 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 139 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 140 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 141 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 142 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 143 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 144 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 145 * 146 * Alternatively, you may choose to be licensed under the terms of the 147 * GNU General Public License ("GPL") version 2 as published by the Free 148 * Software Foundation. 149 * 150 *****************************************************************************/ 151 152 #include "acpi.h" 153 #include "accommon.h" 154 155 156 #define _COMPONENT ACPI_UTILITIES 157 ACPI_MODULE_NAME ("utosi") 158 159 160 /****************************************************************************** 161 * 162 * ACPICA policy for new _OSI strings: 163 * 164 * It is the stated policy of ACPICA that new _OSI strings will be integrated 165 * into this module as soon as possible after they are defined. It is strongly 166 * recommended that all ACPICA hosts mirror this policy and integrate any 167 * changes to this module as soon as possible. There are several historical 168 * reasons behind this policy: 169 * 170 * 1) New BIOSs tend to test only the case where the host responds TRUE to 171 * the latest version of Windows, which would respond to the latest/newest 172 * _OSI string. Not responding TRUE to the latest version of Windows will 173 * risk executing untested code paths throughout the DSDT and SSDTs. 174 * 175 * 2) If a new _OSI string is recognized only after a significant delay, this 176 * has the potential to cause problems on existing working machines because 177 * of the possibility that a new and different path through the ASL code 178 * will be executed. 179 * 180 * 3) New _OSI strings are tending to come out about once per year. A delay 181 * in recognizing a new string for a significant amount of time risks the 182 * release of another string which only compounds the initial problem. 183 * 184 *****************************************************************************/ 185 186 187 /* 188 * Strings supported by the _OSI predefined control method (which is 189 * implemented internally within this module.) 190 * 191 * March 2009: Removed "Linux" as this host no longer wants to respond true 192 * for this string. Basically, the only safe OS strings are windows-related 193 * and in many or most cases represent the only test path within the 194 * BIOS-provided ASL code. 195 * 196 * The last element of each entry is used to track the newest version of 197 * Windows that the BIOS has requested. 198 */ 199 static ACPI_INTERFACE_INFO AcpiDefaultSupportedInterfaces[] = 200 { 201 /* Operating System Vendor Strings */ 202 203 {"Windows 2000", NULL, 0, ACPI_OSI_WIN_2000}, /* Windows 2000 */ 204 {"Windows 2001", NULL, 0, ACPI_OSI_WIN_XP}, /* Windows XP */ 205 {"Windows 2001 SP1", NULL, 0, ACPI_OSI_WIN_XP_SP1}, /* Windows XP SP1 */ 206 {"Windows 2001.1", NULL, 0, ACPI_OSI_WINSRV_2003}, /* Windows Server 2003 */ 207 {"Windows 2001 SP2", NULL, 0, ACPI_OSI_WIN_XP_SP2}, /* Windows XP SP2 */ 208 {"Windows 2001.1 SP1", NULL, 0, ACPI_OSI_WINSRV_2003_SP1}, /* Windows Server 2003 SP1 - Added 03/2006 */ 209 {"Windows 2006", NULL, 0, ACPI_OSI_WIN_VISTA}, /* Windows Vista - Added 03/2006 */ 210 {"Windows 2006.1", NULL, 0, ACPI_OSI_WINSRV_2008}, /* Windows Server 2008 - Added 09/2009 */ 211 {"Windows 2006 SP1", NULL, 0, ACPI_OSI_WIN_VISTA_SP1}, /* Windows Vista SP1 - Added 09/2009 */ 212 {"Windows 2006 SP2", NULL, 0, ACPI_OSI_WIN_VISTA_SP2}, /* Windows Vista SP2 - Added 09/2010 */ 213 {"Windows 2009", NULL, 0, ACPI_OSI_WIN_7}, /* Windows 7 and Server 2008 R2 - Added 09/2009 */ 214 {"Windows 2012", NULL, 0, ACPI_OSI_WIN_8}, /* Windows 8 and Server 2012 - Added 08/2012 */ 215 {"Windows 2013", NULL, 0, ACPI_OSI_WIN_8_1}, /* Windows 8.1 and Server 2012 R2 - Added 01/2014 */ 216 {"Windows 2015", NULL, 0, ACPI_OSI_WIN_10}, /* Windows 10 - Added 03/2015 */ 217 {"Windows 2016", NULL, 0, ACPI_OSI_WIN_10_RS1}, /* Windows 10 version 1607 - Added 12/2017 */ 218 {"Windows 2017", NULL, 0, ACPI_OSI_WIN_10_RS2}, /* Windows 10 version 1703 - Added 12/2017 */ 219 {"Windows 2017.2", NULL, 0, ACPI_OSI_WIN_10_RS3}, /* Windows 10 version 1709 - Added 02/2018 */ 220 {"Windows 2018", NULL, 0, ACPI_OSI_WIN_10_RS4}, /* Windows 10 version 1803 - Added 11/2018 */ 221 {"Windows 2018.2", NULL, 0, ACPI_OSI_WIN_10_RS5}, /* Windows 10 version 1809 - Added 11/2018 */ 222 {"Windows 2019", NULL, 0, ACPI_OSI_WIN_10_19H1}, /* Windows 10 version 1903 - Added 08/2019 */ 223 {"Windows 2020", NULL, 0, ACPI_OSI_WIN_10_20H1}, /* Windows 10 version 2004 - Added 08/2021 */ 224 225 /* Feature Group Strings */ 226 227 {"Extended Address Space Descriptor", NULL, ACPI_OSI_FEATURE, 0}, 228 229 /* 230 * All "optional" feature group strings (features that are implemented 231 * by the host) should be dynamically modified to VALID by the host via 232 * AcpiInstallInterface or AcpiUpdateInterfaces. Such optional feature 233 * group strings are set as INVALID by default here. 234 */ 235 236 {"Module Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0}, 237 {"Processor Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0}, 238 {"3.0 Thermal Model", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0}, 239 {"3.0 _SCP Extensions", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0}, 240 {"Processor Aggregator Device", NULL, ACPI_OSI_OPTIONAL_FEATURE, 0} 241 }; 242 243 244 /******************************************************************************* 245 * 246 * FUNCTION: AcpiUtInitializeInterfaces 247 * 248 * PARAMETERS: None 249 * 250 * RETURN: Status 251 * 252 * DESCRIPTION: Initialize the global _OSI supported interfaces list 253 * 254 ******************************************************************************/ 255 256 ACPI_STATUS 257 AcpiUtInitializeInterfaces ( 258 void) 259 { 260 ACPI_STATUS Status; 261 UINT32 i; 262 263 264 Status = AcpiOsAcquireMutex (AcpiGbl_OsiMutex, ACPI_WAIT_FOREVER); 265 if (ACPI_FAILURE (Status)) 266 { 267 return (Status); 268 } 269 270 AcpiGbl_SupportedInterfaces = AcpiDefaultSupportedInterfaces; 271 272 /* Link the static list of supported interfaces */ 273 274 for (i = 0; 275 i < (ACPI_ARRAY_LENGTH (AcpiDefaultSupportedInterfaces) - 1); 276 i++) 277 { 278 AcpiDefaultSupportedInterfaces[i].Next = 279 &AcpiDefaultSupportedInterfaces[(ACPI_SIZE) i + 1]; 280 } 281 282 AcpiOsReleaseMutex (AcpiGbl_OsiMutex); 283 return (AE_OK); 284 } 285 286 287 /******************************************************************************* 288 * 289 * FUNCTION: AcpiUtInterfaceTerminate 290 * 291 * PARAMETERS: None 292 * 293 * RETURN: Status 294 * 295 * DESCRIPTION: Delete all interfaces in the global list. Sets 296 * AcpiGbl_SupportedInterfaces to NULL. 297 * 298 ******************************************************************************/ 299 300 ACPI_STATUS 301 AcpiUtInterfaceTerminate ( 302 void) 303 { 304 ACPI_STATUS Status; 305 ACPI_INTERFACE_INFO *NextInterface; 306 307 308 Status = AcpiOsAcquireMutex (AcpiGbl_OsiMutex, ACPI_WAIT_FOREVER); 309 if (ACPI_FAILURE (Status)) 310 { 311 return (Status); 312 } 313 314 NextInterface = AcpiGbl_SupportedInterfaces; 315 while (NextInterface) 316 { 317 AcpiGbl_SupportedInterfaces = NextInterface->Next; 318 319 if (NextInterface->Flags & ACPI_OSI_DYNAMIC) 320 { 321 /* Only interfaces added at runtime can be freed */ 322 323 ACPI_FREE (NextInterface->Name); 324 ACPI_FREE (NextInterface); 325 } 326 else 327 { 328 /* Interface is in static list. Reset it to invalid or valid. */ 329 330 if (NextInterface->Flags & ACPI_OSI_DEFAULT_INVALID) 331 { 332 NextInterface->Flags |= ACPI_OSI_INVALID; 333 } 334 else 335 { 336 NextInterface->Flags &= ~ACPI_OSI_INVALID; 337 } 338 } 339 340 NextInterface = AcpiGbl_SupportedInterfaces; 341 } 342 343 AcpiOsReleaseMutex (AcpiGbl_OsiMutex); 344 return (AE_OK); 345 } 346 347 348 /******************************************************************************* 349 * 350 * FUNCTION: AcpiUtInstallInterface 351 * 352 * PARAMETERS: InterfaceName - The interface to install 353 * 354 * RETURN: Status 355 * 356 * DESCRIPTION: Install the interface into the global interface list. 357 * Caller MUST hold AcpiGbl_OsiMutex 358 * 359 ******************************************************************************/ 360 361 ACPI_STATUS 362 AcpiUtInstallInterface ( 363 ACPI_STRING InterfaceName) 364 { 365 ACPI_INTERFACE_INFO *InterfaceInfo; 366 367 368 /* Allocate info block and space for the name string */ 369 370 InterfaceInfo = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_INTERFACE_INFO)); 371 if (!InterfaceInfo) 372 { 373 return (AE_NO_MEMORY); 374 } 375 376 InterfaceInfo->Name = ACPI_ALLOCATE_ZEROED (strlen (InterfaceName) + 1); 377 if (!InterfaceInfo->Name) 378 { 379 ACPI_FREE (InterfaceInfo); 380 return (AE_NO_MEMORY); 381 } 382 383 /* Initialize new info and insert at the head of the global list */ 384 385 strcpy (InterfaceInfo->Name, InterfaceName); 386 InterfaceInfo->Flags = ACPI_OSI_DYNAMIC; 387 InterfaceInfo->Next = AcpiGbl_SupportedInterfaces; 388 389 AcpiGbl_SupportedInterfaces = InterfaceInfo; 390 return (AE_OK); 391 } 392 393 394 /******************************************************************************* 395 * 396 * FUNCTION: AcpiUtRemoveInterface 397 * 398 * PARAMETERS: InterfaceName - The interface to remove 399 * 400 * RETURN: Status 401 * 402 * DESCRIPTION: Remove the interface from the global interface list. 403 * Caller MUST hold AcpiGbl_OsiMutex 404 * 405 ******************************************************************************/ 406 407 ACPI_STATUS 408 AcpiUtRemoveInterface ( 409 ACPI_STRING InterfaceName) 410 { 411 ACPI_INTERFACE_INFO *PreviousInterface; 412 ACPI_INTERFACE_INFO *NextInterface; 413 414 415 PreviousInterface = NextInterface = AcpiGbl_SupportedInterfaces; 416 while (NextInterface) 417 { 418 if (!strcmp (InterfaceName, NextInterface->Name)) 419 { 420 /* 421 * Found: name is in either the static list 422 * or was added at runtime 423 */ 424 if (NextInterface->Flags & ACPI_OSI_DYNAMIC) 425 { 426 /* Interface was added dynamically, remove and free it */ 427 428 if (PreviousInterface == NextInterface) 429 { 430 AcpiGbl_SupportedInterfaces = NextInterface->Next; 431 } 432 else 433 { 434 PreviousInterface->Next = NextInterface->Next; 435 } 436 437 ACPI_FREE (NextInterface->Name); 438 ACPI_FREE (NextInterface); 439 } 440 else 441 { 442 /* 443 * Interface is in static list. If marked invalid, then 444 * it does not actually exist. Else, mark it invalid. 445 */ 446 if (NextInterface->Flags & ACPI_OSI_INVALID) 447 { 448 return (AE_NOT_EXIST); 449 } 450 451 NextInterface->Flags |= ACPI_OSI_INVALID; 452 } 453 454 return (AE_OK); 455 } 456 457 PreviousInterface = NextInterface; 458 NextInterface = NextInterface->Next; 459 } 460 461 /* Interface was not found */ 462 463 return (AE_NOT_EXIST); 464 } 465 466 467 /******************************************************************************* 468 * 469 * FUNCTION: AcpiUtUpdateInterfaces 470 * 471 * PARAMETERS: Action - Actions to be performed during the 472 * update 473 * 474 * RETURN: Status 475 * 476 * DESCRIPTION: Update _OSI interface strings, disabling or enabling OS vendor 477 * strings or/and feature group strings. 478 * Caller MUST hold AcpiGbl_OsiMutex 479 * 480 ******************************************************************************/ 481 482 ACPI_STATUS 483 AcpiUtUpdateInterfaces ( 484 UINT8 Action) 485 { 486 ACPI_INTERFACE_INFO *NextInterface; 487 488 489 NextInterface = AcpiGbl_SupportedInterfaces; 490 while (NextInterface) 491 { 492 if (((NextInterface->Flags & ACPI_OSI_FEATURE) && 493 (Action & ACPI_FEATURE_STRINGS)) || 494 (!(NextInterface->Flags & ACPI_OSI_FEATURE) && 495 (Action & ACPI_VENDOR_STRINGS))) 496 { 497 if (Action & ACPI_DISABLE_INTERFACES) 498 { 499 /* Mark the interfaces as invalid */ 500 501 NextInterface->Flags |= ACPI_OSI_INVALID; 502 } 503 else 504 { 505 /* Mark the interfaces as valid */ 506 507 NextInterface->Flags &= ~ACPI_OSI_INVALID; 508 } 509 } 510 511 NextInterface = NextInterface->Next; 512 } 513 514 return (AE_OK); 515 } 516 517 518 /******************************************************************************* 519 * 520 * FUNCTION: AcpiUtGetInterface 521 * 522 * PARAMETERS: InterfaceName - The interface to find 523 * 524 * RETURN: ACPI_INTERFACE_INFO if found. NULL if not found. 525 * 526 * DESCRIPTION: Search for the specified interface name in the global list. 527 * Caller MUST hold AcpiGbl_OsiMutex 528 * 529 ******************************************************************************/ 530 531 ACPI_INTERFACE_INFO * 532 AcpiUtGetInterface ( 533 ACPI_STRING InterfaceName) 534 { 535 ACPI_INTERFACE_INFO *NextInterface; 536 537 538 NextInterface = AcpiGbl_SupportedInterfaces; 539 while (NextInterface) 540 { 541 if (!strcmp (InterfaceName, NextInterface->Name)) 542 { 543 return (NextInterface); 544 } 545 546 NextInterface = NextInterface->Next; 547 } 548 549 return (NULL); 550 } 551 552 553 /******************************************************************************* 554 * 555 * FUNCTION: AcpiUtOsiImplementation 556 * 557 * PARAMETERS: WalkState - Current walk state 558 * 559 * RETURN: Status 560 * Integer: TRUE (0) if input string is matched 561 * FALSE (-1) if string is not matched 562 * 563 * DESCRIPTION: Implementation of the _OSI predefined control method. When 564 * an invocation of _OSI is encountered in the system AML, 565 * control is transferred to this function. 566 * 567 * (August 2016) 568 * Note: _OSI is now defined to return "Ones" to indicate a match, for 569 * compatibility with other ACPI implementations. On a 32-bit DSDT, Ones 570 * is 0xFFFFFFFF. On a 64-bit DSDT, Ones is 0xFFFFFFFFFFFFFFFF 571 * (ACPI_UINT64_MAX). 572 * 573 * This function always returns ACPI_UINT64_MAX for TRUE, and later code 574 * will truncate this to 32 bits if necessary. 575 * 576 ******************************************************************************/ 577 578 ACPI_STATUS 579 AcpiUtOsiImplementation ( 580 ACPI_WALK_STATE *WalkState) 581 { 582 ACPI_OPERAND_OBJECT *StringDesc; 583 ACPI_OPERAND_OBJECT *ReturnDesc; 584 ACPI_INTERFACE_INFO *InterfaceInfo; 585 ACPI_INTERFACE_HANDLER InterfaceHandler; 586 ACPI_STATUS Status; 587 UINT64 ReturnValue; 588 589 590 ACPI_FUNCTION_TRACE (UtOsiImplementation); 591 592 593 /* Validate the string input argument (from the AML caller) */ 594 595 StringDesc = WalkState->Arguments[0].Object; 596 if (!StringDesc || 597 (StringDesc->Common.Type != ACPI_TYPE_STRING)) 598 { 599 return_ACPI_STATUS (AE_TYPE); 600 } 601 602 /* Create a return object */ 603 604 ReturnDesc = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER); 605 if (!ReturnDesc) 606 { 607 return_ACPI_STATUS (AE_NO_MEMORY); 608 } 609 610 /* Default return value is 0, NOT SUPPORTED */ 611 612 ReturnValue = 0; 613 Status = AcpiOsAcquireMutex (AcpiGbl_OsiMutex, ACPI_WAIT_FOREVER); 614 if (ACPI_FAILURE (Status)) 615 { 616 AcpiUtRemoveReference (ReturnDesc); 617 return_ACPI_STATUS (Status); 618 } 619 620 /* Lookup the interface in the global _OSI list */ 621 622 InterfaceInfo = AcpiUtGetInterface (StringDesc->String.Pointer); 623 if (InterfaceInfo && 624 !(InterfaceInfo->Flags & ACPI_OSI_INVALID)) 625 { 626 /* 627 * The interface is supported. 628 * Update the OsiData if necessary. We keep track of the latest 629 * version of Windows that has been requested by the BIOS. 630 */ 631 if (InterfaceInfo->Value > AcpiGbl_OsiData) 632 { 633 AcpiGbl_OsiData = InterfaceInfo->Value; 634 } 635 636 ReturnValue = ACPI_UINT64_MAX; 637 } 638 639 AcpiOsReleaseMutex (AcpiGbl_OsiMutex); 640 641 /* 642 * Invoke an optional _OSI interface handler. The host OS may wish 643 * to do some interface-specific handling. For example, warn about 644 * certain interfaces or override the true/false support value. 645 */ 646 InterfaceHandler = AcpiGbl_InterfaceHandler; 647 if (InterfaceHandler) 648 { 649 if (InterfaceHandler ( 650 StringDesc->String.Pointer, (UINT32) ReturnValue)) 651 { 652 ReturnValue = ACPI_UINT64_MAX; 653 } 654 } 655 656 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INFO, 657 "ACPI: BIOS _OSI(\"%s\") is %ssupported\n", 658 StringDesc->String.Pointer, ReturnValue == 0 ? "not " : "")); 659 660 /* Complete the return object */ 661 662 ReturnDesc->Integer.Value = ReturnValue; 663 WalkState->ReturnDesc = ReturnDesc; 664 return_ACPI_STATUS (AE_OK); 665 } 666