| 1 | /****************************************************************************** |
| 2 | * |
| 3 | * Module Name: utosi - Support for the _OSI predefined control method |
| 4 | * |
| 5 | *****************************************************************************/ |
| 6 | |
| 7 | /* |
| 8 | * Copyright (C) 2000 - 2016, Intel Corp. |
| 9 | * All rights reserved. |
| 10 | * |
| 11 | * Redistribution and use in source and binary forms, with or without |
| 12 | * modification, are permitted provided that the following conditions |
| 13 | * are met: |
| 14 | * 1. Redistributions of source code must retain the above copyright |
| 15 | * notice, this list of conditions, and the following disclaimer, |
| 16 | * without modification. |
| 17 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer |
| 18 | * substantially similar to the "NO WARRANTY" disclaimer below |
| 19 | * ("Disclaimer") and any redistribution must be conditioned upon |
| 20 | * including a substantially similar Disclaimer requirement for further |
| 21 | * binary redistribution. |
| 22 | * 3. Neither the names of the above-listed copyright holders nor the names |
| 23 | * of any contributors may be used to endorse or promote products derived |
| 24 | * from this software without specific prior written permission. |
| 25 | * |
| 26 | * Alternatively, this software may be distributed under the terms of the |
| 27 | * GNU General Public License ("GPL") version 2 as published by the Free |
| 28 | * Software Foundation. |
| 29 | * |
| 30 | * NO WARRANTY |
| 31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR |
| 34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 35 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 36 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 37 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 38 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| 39 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| 40 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 41 | * POSSIBILITY OF SUCH DAMAGES. |
| 42 | */ |
| 43 | |
| 44 | #include "acpi.h" |
| 45 | #include "accommon.h" |
| 46 | |
| 47 | |
| 48 | #define _COMPONENT ACPI_UTILITIES |
| 49 | ACPI_MODULE_NAME ("utosi" ) |
| 50 | |
| 51 | |
| 52 | /****************************************************************************** |
| 53 | * |
| 54 | * ACPICA policy for new _OSI strings: |
| 55 | * |
| 56 | * It is the stated policy of ACPICA that new _OSI strings will be integrated |
| 57 | * into this module as soon as possible after they are defined. It is strongly |
| 58 | * recommended that all ACPICA hosts mirror this policy and integrate any |
| 59 | * changes to this module as soon as possible. There are several historical |
| 60 | * reasons behind this policy: |
| 61 | * |
| 62 | * 1) New BIOSs tend to test only the case where the host responds TRUE to |
| 63 | * the latest version of Windows, which would respond to the latest/newest |
| 64 | * _OSI string. Not responding TRUE to the latest version of Windows will |
| 65 | * risk executing untested code paths throughout the DSDT and SSDTs. |
| 66 | * |
| 67 | * 2) If a new _OSI string is recognized only after a significant delay, this |
| 68 | * has the potential to cause problems on existing working machines because |
| 69 | * of the possibility that a new and different path through the ASL code |
| 70 | * will be executed. |
| 71 | * |
| 72 | * 3) New _OSI strings are tending to come out about once per year. A delay |
| 73 | * in recognizing a new string for a significant amount of time risks the |
| 74 | * release of another string which only compounds the initial problem. |
| 75 | * |
| 76 | *****************************************************************************/ |
| 77 | |
| 78 | |
| 79 | /* |
| 80 | * Strings supported by the _OSI predefined control method (which is |
| 81 | * implemented internally within this module.) |
| 82 | * |
| 83 | * March 2009: Removed "Linux" as this host no longer wants to respond true |
| 84 | * for this string. Basically, the only safe OS strings are windows-related |
| 85 | * and in many or most cases represent the only test path within the |
| 86 | * BIOS-provided ASL code. |
| 87 | * |
| 88 | * The last element of each entry is used to track the newest version of |
| 89 | * Windows that the BIOS has requested. |
| 90 | */ |
| 91 | static ACPI_INTERFACE_INFO AcpiDefaultSupportedInterfaces[] = |
| 92 | { |
| 93 | /* Operating System Vendor Strings */ |
| 94 | |
| 95 | {__UNCONST("Windows 2000" ), NULL, 0, ACPI_OSI_WIN_2000}, /* Windows 2000 */ |
| 96 | {__UNCONST("Windows 2001" ), NULL, 0, ACPI_OSI_WIN_XP}, /* Windows XP */ |
| 97 | {__UNCONST("Windows 2001 SP1" ), NULL, 0, ACPI_OSI_WIN_XP_SP1}, /* Windows XP SP1 */ |
| 98 | {__UNCONST("Windows 2001.1" ), NULL, 0, ACPI_OSI_WINSRV_2003}, /* Windows Server 2003 */ |
| 99 | {__UNCONST("Windows 2001 SP2" ), NULL, 0, ACPI_OSI_WIN_XP_SP2}, /* Windows XP SP2 */ |
| 100 | {__UNCONST("Windows 2001.1 SP1" ), NULL, 0, ACPI_OSI_WINSRV_2003_SP1}, /* Windows Server 2003 SP1 - Added 03/2006 */ |
| 101 | {__UNCONST("Windows 2006" ), NULL, 0, ACPI_OSI_WIN_VISTA}, /* Windows Vista - Added 03/2006 */ |
| 102 | {__UNCONST("Windows 2006.1" ), NULL, 0, ACPI_OSI_WINSRV_2008}, /* Windows Server 2008 - Added 09/2009 */ |
| 103 | {__UNCONST("Windows 2006 SP1" ), NULL, 0, ACPI_OSI_WIN_VISTA_SP1}, /* Windows Vista SP1 - Added 09/2009 */ |
| 104 | {__UNCONST("Windows 2006 SP2" ), NULL, 0, ACPI_OSI_WIN_VISTA_SP2}, /* Windows Vista SP2 - Added 09/2010 */ |
| 105 | {__UNCONST("Windows 2009" ), NULL, 0, ACPI_OSI_WIN_7}, /* Windows 7 and Server 2008 R2 - Added 09/2009 */ |
| 106 | {__UNCONST("Windows 2012" ), NULL, 0, ACPI_OSI_WIN_8}, /* Windows 8 and Server 2012 - Added 08/2012 */ |
| 107 | {__UNCONST("Windows 2013" ), NULL, 0, ACPI_OSI_WIN_8}, /* Windows 8.1 and Server 2012 R2 - Added 01/2014 */ |
| 108 | {__UNCONST("Windows 2015" ), NULL, 0, ACPI_OSI_WIN_10}, /* Windows 10 - Added 03/2015 */ |
| 109 | |
| 110 | /* Feature Group Strings */ |
| 111 | |
| 112 | {__UNCONST("Extended Address Space Descriptor" ), NULL, ACPI_OSI_FEATURE, 0}, |
| 113 | |
| 114 | /* |
| 115 | * All "optional" feature group strings (features that are implemented |
| 116 | * by the host) should be dynamically modified to VALID by the host via |
| 117 | * AcpiInstallInterface or AcpiUpdateInterfaces. Such optional feature |
| 118 | * group strings are set as INVALID by default here. |
| 119 | */ |
| 120 | |
| 121 | {__UNCONST("Module Device" ), NULL, ACPI_OSI_OPTIONAL_FEATURE, 0}, |
| 122 | {__UNCONST("Processor Device" ), NULL, ACPI_OSI_OPTIONAL_FEATURE, 0}, |
| 123 | {__UNCONST("3.0 Thermal Model" ), NULL, ACPI_OSI_OPTIONAL_FEATURE, 0}, |
| 124 | {__UNCONST("3.0 _SCP Extensions" ), NULL, ACPI_OSI_OPTIONAL_FEATURE, 0}, |
| 125 | {__UNCONST("Processor Aggregator Device" ), NULL, ACPI_OSI_OPTIONAL_FEATURE, 0} |
| 126 | }; |
| 127 | |
| 128 | |
| 129 | /******************************************************************************* |
| 130 | * |
| 131 | * FUNCTION: AcpiUtInitializeInterfaces |
| 132 | * |
| 133 | * PARAMETERS: None |
| 134 | * |
| 135 | * RETURN: Status |
| 136 | * |
| 137 | * DESCRIPTION: Initialize the global _OSI supported interfaces list |
| 138 | * |
| 139 | ******************************************************************************/ |
| 140 | |
| 141 | ACPI_STATUS |
| 142 | AcpiUtInitializeInterfaces ( |
| 143 | void) |
| 144 | { |
| 145 | ACPI_STATUS Status; |
| 146 | UINT32 i; |
| 147 | |
| 148 | |
| 149 | Status = AcpiOsAcquireMutex (AcpiGbl_OsiMutex, ACPI_WAIT_FOREVER); |
| 150 | if (ACPI_FAILURE (Status)) |
| 151 | { |
| 152 | return (Status); |
| 153 | } |
| 154 | |
| 155 | AcpiGbl_SupportedInterfaces = AcpiDefaultSupportedInterfaces; |
| 156 | |
| 157 | /* Link the static list of supported interfaces */ |
| 158 | |
| 159 | for (i = 0; |
| 160 | i < (ACPI_ARRAY_LENGTH (AcpiDefaultSupportedInterfaces) - 1); |
| 161 | i++) |
| 162 | { |
| 163 | AcpiDefaultSupportedInterfaces[i].Next = |
| 164 | &AcpiDefaultSupportedInterfaces[(ACPI_SIZE) i + 1]; |
| 165 | } |
| 166 | |
| 167 | AcpiOsReleaseMutex (AcpiGbl_OsiMutex); |
| 168 | return (AE_OK); |
| 169 | } |
| 170 | |
| 171 | |
| 172 | /******************************************************************************* |
| 173 | * |
| 174 | * FUNCTION: AcpiUtInterfaceTerminate |
| 175 | * |
| 176 | * PARAMETERS: None |
| 177 | * |
| 178 | * RETURN: Status |
| 179 | * |
| 180 | * DESCRIPTION: Delete all interfaces in the global list. Sets |
| 181 | * AcpiGbl_SupportedInterfaces to NULL. |
| 182 | * |
| 183 | ******************************************************************************/ |
| 184 | |
| 185 | ACPI_STATUS |
| 186 | AcpiUtInterfaceTerminate ( |
| 187 | void) |
| 188 | { |
| 189 | ACPI_STATUS Status; |
| 190 | ACPI_INTERFACE_INFO *NextInterface; |
| 191 | |
| 192 | |
| 193 | Status = AcpiOsAcquireMutex (AcpiGbl_OsiMutex, ACPI_WAIT_FOREVER); |
| 194 | if (ACPI_FAILURE (Status)) |
| 195 | { |
| 196 | return (Status); |
| 197 | } |
| 198 | |
| 199 | NextInterface = AcpiGbl_SupportedInterfaces; |
| 200 | while (NextInterface) |
| 201 | { |
| 202 | AcpiGbl_SupportedInterfaces = NextInterface->Next; |
| 203 | |
| 204 | if (NextInterface->Flags & ACPI_OSI_DYNAMIC) |
| 205 | { |
| 206 | /* Only interfaces added at runtime can be freed */ |
| 207 | |
| 208 | ACPI_FREE (NextInterface->Name); |
| 209 | ACPI_FREE (NextInterface); |
| 210 | } |
| 211 | else |
| 212 | { |
| 213 | /* Interface is in static list. Reset it to invalid or valid. */ |
| 214 | |
| 215 | if (NextInterface->Flags & ACPI_OSI_DEFAULT_INVALID) |
| 216 | { |
| 217 | NextInterface->Flags |= ACPI_OSI_INVALID; |
| 218 | } |
| 219 | else |
| 220 | { |
| 221 | NextInterface->Flags &= ~ACPI_OSI_INVALID; |
| 222 | } |
| 223 | } |
| 224 | |
| 225 | NextInterface = AcpiGbl_SupportedInterfaces; |
| 226 | } |
| 227 | |
| 228 | AcpiOsReleaseMutex (AcpiGbl_OsiMutex); |
| 229 | return (AE_OK); |
| 230 | } |
| 231 | |
| 232 | |
| 233 | /******************************************************************************* |
| 234 | * |
| 235 | * FUNCTION: AcpiUtInstallInterface |
| 236 | * |
| 237 | * PARAMETERS: InterfaceName - The interface to install |
| 238 | * |
| 239 | * RETURN: Status |
| 240 | * |
| 241 | * DESCRIPTION: Install the interface into the global interface list. |
| 242 | * Caller MUST hold AcpiGbl_OsiMutex |
| 243 | * |
| 244 | ******************************************************************************/ |
| 245 | |
| 246 | ACPI_STATUS |
| 247 | AcpiUtInstallInterface ( |
| 248 | ACPI_STRING InterfaceName) |
| 249 | { |
| 250 | ACPI_INTERFACE_INFO *InterfaceInfo; |
| 251 | |
| 252 | |
| 253 | /* Allocate info block and space for the name string */ |
| 254 | |
| 255 | InterfaceInfo = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_INTERFACE_INFO)); |
| 256 | if (!InterfaceInfo) |
| 257 | { |
| 258 | return (AE_NO_MEMORY); |
| 259 | } |
| 260 | |
| 261 | InterfaceInfo->Name = ACPI_ALLOCATE_ZEROED (strlen (InterfaceName) + 1); |
| 262 | if (!InterfaceInfo->Name) |
| 263 | { |
| 264 | ACPI_FREE (InterfaceInfo); |
| 265 | return (AE_NO_MEMORY); |
| 266 | } |
| 267 | |
| 268 | /* Initialize new info and insert at the head of the global list */ |
| 269 | |
| 270 | strcpy (InterfaceInfo->Name, InterfaceName); |
| 271 | InterfaceInfo->Flags = ACPI_OSI_DYNAMIC; |
| 272 | InterfaceInfo->Next = AcpiGbl_SupportedInterfaces; |
| 273 | |
| 274 | AcpiGbl_SupportedInterfaces = InterfaceInfo; |
| 275 | return (AE_OK); |
| 276 | } |
| 277 | |
| 278 | |
| 279 | /******************************************************************************* |
| 280 | * |
| 281 | * FUNCTION: AcpiUtRemoveInterface |
| 282 | * |
| 283 | * PARAMETERS: InterfaceName - The interface to remove |
| 284 | * |
| 285 | * RETURN: Status |
| 286 | * |
| 287 | * DESCRIPTION: Remove the interface from the global interface list. |
| 288 | * Caller MUST hold AcpiGbl_OsiMutex |
| 289 | * |
| 290 | ******************************************************************************/ |
| 291 | |
| 292 | ACPI_STATUS |
| 293 | AcpiUtRemoveInterface ( |
| 294 | ACPI_STRING InterfaceName) |
| 295 | { |
| 296 | ACPI_INTERFACE_INFO *PreviousInterface; |
| 297 | ACPI_INTERFACE_INFO *NextInterface; |
| 298 | |
| 299 | |
| 300 | PreviousInterface = NextInterface = AcpiGbl_SupportedInterfaces; |
| 301 | while (NextInterface) |
| 302 | { |
| 303 | if (!strcmp (InterfaceName, NextInterface->Name)) |
| 304 | { |
| 305 | /* |
| 306 | * Found: name is in either the static list |
| 307 | * or was added at runtime |
| 308 | */ |
| 309 | if (NextInterface->Flags & ACPI_OSI_DYNAMIC) |
| 310 | { |
| 311 | /* Interface was added dynamically, remove and free it */ |
| 312 | |
| 313 | if (PreviousInterface == NextInterface) |
| 314 | { |
| 315 | AcpiGbl_SupportedInterfaces = NextInterface->Next; |
| 316 | } |
| 317 | else |
| 318 | { |
| 319 | PreviousInterface->Next = NextInterface->Next; |
| 320 | } |
| 321 | |
| 322 | ACPI_FREE (NextInterface->Name); |
| 323 | ACPI_FREE (NextInterface); |
| 324 | } |
| 325 | else |
| 326 | { |
| 327 | /* |
| 328 | * Interface is in static list. If marked invalid, then |
| 329 | * it does not actually exist. Else, mark it invalid. |
| 330 | */ |
| 331 | if (NextInterface->Flags & ACPI_OSI_INVALID) |
| 332 | { |
| 333 | return (AE_NOT_EXIST); |
| 334 | } |
| 335 | |
| 336 | NextInterface->Flags |= ACPI_OSI_INVALID; |
| 337 | } |
| 338 | |
| 339 | return (AE_OK); |
| 340 | } |
| 341 | |
| 342 | PreviousInterface = NextInterface; |
| 343 | NextInterface = NextInterface->Next; |
| 344 | } |
| 345 | |
| 346 | /* Interface was not found */ |
| 347 | |
| 348 | return (AE_NOT_EXIST); |
| 349 | } |
| 350 | |
| 351 | |
| 352 | /******************************************************************************* |
| 353 | * |
| 354 | * FUNCTION: AcpiUtUpdateInterfaces |
| 355 | * |
| 356 | * PARAMETERS: Action - Actions to be performed during the |
| 357 | * update |
| 358 | * |
| 359 | * RETURN: Status |
| 360 | * |
| 361 | * DESCRIPTION: Update _OSI interface strings, disabling or enabling OS vendor |
| 362 | * strings or/and feature group strings. |
| 363 | * Caller MUST hold AcpiGbl_OsiMutex |
| 364 | * |
| 365 | ******************************************************************************/ |
| 366 | |
| 367 | ACPI_STATUS |
| 368 | AcpiUtUpdateInterfaces ( |
| 369 | UINT8 Action) |
| 370 | { |
| 371 | ACPI_INTERFACE_INFO *NextInterface; |
| 372 | |
| 373 | |
| 374 | NextInterface = AcpiGbl_SupportedInterfaces; |
| 375 | while (NextInterface) |
| 376 | { |
| 377 | if (((NextInterface->Flags & ACPI_OSI_FEATURE) && |
| 378 | (Action & ACPI_FEATURE_STRINGS)) || |
| 379 | (!(NextInterface->Flags & ACPI_OSI_FEATURE) && |
| 380 | (Action & ACPI_VENDOR_STRINGS))) |
| 381 | { |
| 382 | if (Action & ACPI_DISABLE_INTERFACES) |
| 383 | { |
| 384 | /* Mark the interfaces as invalid */ |
| 385 | |
| 386 | NextInterface->Flags |= ACPI_OSI_INVALID; |
| 387 | } |
| 388 | else |
| 389 | { |
| 390 | /* Mark the interfaces as valid */ |
| 391 | |
| 392 | NextInterface->Flags &= ~ACPI_OSI_INVALID; |
| 393 | } |
| 394 | } |
| 395 | |
| 396 | NextInterface = NextInterface->Next; |
| 397 | } |
| 398 | |
| 399 | return (AE_OK); |
| 400 | } |
| 401 | |
| 402 | |
| 403 | /******************************************************************************* |
| 404 | * |
| 405 | * FUNCTION: AcpiUtGetInterface |
| 406 | * |
| 407 | * PARAMETERS: InterfaceName - The interface to find |
| 408 | * |
| 409 | * RETURN: ACPI_INTERFACE_INFO if found. NULL if not found. |
| 410 | * |
| 411 | * DESCRIPTION: Search for the specified interface name in the global list. |
| 412 | * Caller MUST hold AcpiGbl_OsiMutex |
| 413 | * |
| 414 | ******************************************************************************/ |
| 415 | |
| 416 | ACPI_INTERFACE_INFO * |
| 417 | AcpiUtGetInterface ( |
| 418 | ACPI_STRING InterfaceName) |
| 419 | { |
| 420 | ACPI_INTERFACE_INFO *NextInterface; |
| 421 | |
| 422 | |
| 423 | NextInterface = AcpiGbl_SupportedInterfaces; |
| 424 | while (NextInterface) |
| 425 | { |
| 426 | if (!strcmp (InterfaceName, NextInterface->Name)) |
| 427 | { |
| 428 | return (NextInterface); |
| 429 | } |
| 430 | |
| 431 | NextInterface = NextInterface->Next; |
| 432 | } |
| 433 | |
| 434 | return (NULL); |
| 435 | } |
| 436 | |
| 437 | |
| 438 | /******************************************************************************* |
| 439 | * |
| 440 | * FUNCTION: AcpiUtOsiImplementation |
| 441 | * |
| 442 | * PARAMETERS: WalkState - Current walk state |
| 443 | * |
| 444 | * RETURN: Status |
| 445 | * Integer: TRUE (0) if input string is matched |
| 446 | * FALSE (-1) if string is not matched |
| 447 | * |
| 448 | * DESCRIPTION: Implementation of the _OSI predefined control method. When |
| 449 | * an invocation of _OSI is encountered in the system AML, |
| 450 | * control is transferred to this function. |
| 451 | * |
| 452 | * (August 2016) |
| 453 | * Note: _OSI is now defined to return "Ones" to indicate a match, for |
| 454 | * compatibility with other ACPI implementations. On a 32-bit DSDT, Ones |
| 455 | * is 0xFFFFFFFF. On a 64-bit DSDT, Ones is 0xFFFFFFFFFFFFFFFF |
| 456 | * (ACPI_UINT64_MAX). |
| 457 | * |
| 458 | * This function always returns ACPI_UINT64_MAX for TRUE, and later code |
| 459 | * will truncate this to 32 bits if necessary. |
| 460 | * |
| 461 | ******************************************************************************/ |
| 462 | |
| 463 | ACPI_STATUS |
| 464 | AcpiUtOsiImplementation ( |
| 465 | ACPI_WALK_STATE *WalkState) |
| 466 | { |
| 467 | ACPI_OPERAND_OBJECT *StringDesc; |
| 468 | ACPI_OPERAND_OBJECT *ReturnDesc; |
| 469 | ACPI_INTERFACE_INFO *InterfaceInfo; |
| 470 | ACPI_INTERFACE_HANDLER InterfaceHandler; |
| 471 | ACPI_STATUS Status; |
| 472 | UINT64 ReturnValue; |
| 473 | |
| 474 | |
| 475 | ACPI_FUNCTION_TRACE (UtOsiImplementation); |
| 476 | |
| 477 | |
| 478 | /* Validate the string input argument (from the AML caller) */ |
| 479 | |
| 480 | StringDesc = WalkState->Arguments[0].Object; |
| 481 | if (!StringDesc || |
| 482 | (StringDesc->Common.Type != ACPI_TYPE_STRING)) |
| 483 | { |
| 484 | return_ACPI_STATUS (AE_TYPE); |
| 485 | } |
| 486 | |
| 487 | /* Create a return object */ |
| 488 | |
| 489 | ReturnDesc = AcpiUtCreateInternalObject (ACPI_TYPE_INTEGER); |
| 490 | if (!ReturnDesc) |
| 491 | { |
| 492 | return_ACPI_STATUS (AE_NO_MEMORY); |
| 493 | } |
| 494 | |
| 495 | /* Default return value is 0, NOT SUPPORTED */ |
| 496 | |
| 497 | ReturnValue = 0; |
| 498 | Status = AcpiOsAcquireMutex (AcpiGbl_OsiMutex, ACPI_WAIT_FOREVER); |
| 499 | if (ACPI_FAILURE (Status)) |
| 500 | { |
| 501 | AcpiUtRemoveReference (ReturnDesc); |
| 502 | return_ACPI_STATUS (Status); |
| 503 | } |
| 504 | |
| 505 | /* Lookup the interface in the global _OSI list */ |
| 506 | |
| 507 | InterfaceInfo = AcpiUtGetInterface (StringDesc->String.Pointer); |
| 508 | if (InterfaceInfo && |
| 509 | !(InterfaceInfo->Flags & ACPI_OSI_INVALID)) |
| 510 | { |
| 511 | /* |
| 512 | * The interface is supported. |
| 513 | * Update the OsiData if necessary. We keep track of the latest |
| 514 | * version of Windows that has been requested by the BIOS. |
| 515 | */ |
| 516 | if (InterfaceInfo->Value > AcpiGbl_OsiData) |
| 517 | { |
| 518 | AcpiGbl_OsiData = InterfaceInfo->Value; |
| 519 | } |
| 520 | |
| 521 | ReturnValue = ACPI_UINT64_MAX; |
| 522 | } |
| 523 | |
| 524 | AcpiOsReleaseMutex (AcpiGbl_OsiMutex); |
| 525 | |
| 526 | /* |
| 527 | * Invoke an optional _OSI interface handler. The host OS may wish |
| 528 | * to do some interface-specific handling. For example, warn about |
| 529 | * certain interfaces or override the true/false support value. |
| 530 | */ |
| 531 | InterfaceHandler = AcpiGbl_InterfaceHandler; |
| 532 | if (InterfaceHandler) |
| 533 | { |
| 534 | if (InterfaceHandler ( |
| 535 | StringDesc->String.Pointer, (UINT32) ReturnValue)) |
| 536 | { |
| 537 | ReturnValue = ACPI_UINT64_MAX; |
| 538 | } |
| 539 | } |
| 540 | |
| 541 | ACPI_DEBUG_PRINT_RAW ((ACPI_DB_INFO, |
| 542 | "ACPI: BIOS _OSI(\"%s\") is %ssupported\n" , |
| 543 | StringDesc->String.Pointer, ReturnValue == 0 ? "not " : "" )); |
| 544 | |
| 545 | /* Complete the return object */ |
| 546 | |
| 547 | ReturnDesc->Integer.Value = ReturnValue; |
| 548 | WalkState->ReturnDesc = ReturnDesc; |
| 549 | return_ACPI_STATUS (AE_OK); |
| 550 | } |
| 551 | |