1 /******************************************************************************* 2 * 3 * Module Name: rsxface - Public interfaces to the resource manager 4 * 5 ******************************************************************************/ 6 7 /****************************************************************************** 8 * 9 * 1. Copyright Notice 10 * 11 * Some or all of this work - Copyright (c) 1999 - 2013, 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 *****************************************************************************/ 115 116 117 #define __RSXFACE_C__ 118 119 #include "acpi.h" 120 #include "accommon.h" 121 #include "acresrc.h" 122 #include "acnamesp.h" 123 124 #define _COMPONENT ACPI_RESOURCES 125 ACPI_MODULE_NAME ("rsxface") 126 127 /* Local macros for 16,32-bit to 64-bit conversion */ 128 129 #define ACPI_COPY_FIELD(Out, In, Field) ((Out)->Field = (In)->Field) 130 #define ACPI_COPY_ADDRESS(Out, In) \ 131 ACPI_COPY_FIELD(Out, In, ResourceType); \ 132 ACPI_COPY_FIELD(Out, In, ProducerConsumer); \ 133 ACPI_COPY_FIELD(Out, In, Decode); \ 134 ACPI_COPY_FIELD(Out, In, MinAddressFixed); \ 135 ACPI_COPY_FIELD(Out, In, MaxAddressFixed); \ 136 ACPI_COPY_FIELD(Out, In, Info); \ 137 ACPI_COPY_FIELD(Out, In, Granularity); \ 138 ACPI_COPY_FIELD(Out, In, Minimum); \ 139 ACPI_COPY_FIELD(Out, In, Maximum); \ 140 ACPI_COPY_FIELD(Out, In, TranslationOffset); \ 141 ACPI_COPY_FIELD(Out, In, AddressLength); \ 142 ACPI_COPY_FIELD(Out, In, ResourceSource); 143 144 145 /* Local prototypes */ 146 147 static ACPI_STATUS 148 AcpiRsMatchVendorResource ( 149 ACPI_RESOURCE *Resource, 150 void *Context); 151 152 static ACPI_STATUS 153 AcpiRsValidateParameters ( 154 ACPI_HANDLE DeviceHandle, 155 ACPI_BUFFER *Buffer, 156 ACPI_NAMESPACE_NODE **ReturnNode); 157 158 159 /******************************************************************************* 160 * 161 * FUNCTION: AcpiRsValidateParameters 162 * 163 * PARAMETERS: DeviceHandle - Handle to a device 164 * Buffer - Pointer to a data buffer 165 * ReturnNode - Pointer to where the device node is returned 166 * 167 * RETURN: Status 168 * 169 * DESCRIPTION: Common parameter validation for resource interfaces 170 * 171 ******************************************************************************/ 172 173 static ACPI_STATUS 174 AcpiRsValidateParameters ( 175 ACPI_HANDLE DeviceHandle, 176 ACPI_BUFFER *Buffer, 177 ACPI_NAMESPACE_NODE **ReturnNode) 178 { 179 ACPI_STATUS Status; 180 ACPI_NAMESPACE_NODE *Node; 181 182 183 ACPI_FUNCTION_TRACE (RsValidateParameters); 184 185 186 /* 187 * Must have a valid handle to an ACPI device 188 */ 189 if (!DeviceHandle) 190 { 191 return_ACPI_STATUS (AE_BAD_PARAMETER); 192 } 193 194 Node = AcpiNsValidateHandle (DeviceHandle); 195 if (!Node) 196 { 197 return_ACPI_STATUS (AE_BAD_PARAMETER); 198 } 199 200 if (Node->Type != ACPI_TYPE_DEVICE) 201 { 202 return_ACPI_STATUS (AE_TYPE); 203 } 204 205 /* 206 * Validate the user buffer object 207 * 208 * if there is a non-zero buffer length we also need a valid pointer in 209 * the buffer. If it's a zero buffer length, we'll be returning the 210 * needed buffer size (later), so keep going. 211 */ 212 Status = AcpiUtValidateBuffer (Buffer); 213 if (ACPI_FAILURE (Status)) 214 { 215 return_ACPI_STATUS (Status); 216 } 217 218 *ReturnNode = Node; 219 return_ACPI_STATUS (AE_OK); 220 } 221 222 223 /******************************************************************************* 224 * 225 * FUNCTION: AcpiGetIrqRoutingTable 226 * 227 * PARAMETERS: DeviceHandle - Handle to the Bus device we are querying 228 * RetBuffer - Pointer to a buffer to receive the 229 * current resources for the device 230 * 231 * RETURN: Status 232 * 233 * DESCRIPTION: This function is called to get the IRQ routing table for a 234 * specific bus. The caller must first acquire a handle for the 235 * desired bus. The routine table is placed in the buffer pointed 236 * to by the RetBuffer variable parameter. 237 * 238 * If the function fails an appropriate status will be returned 239 * and the value of RetBuffer is undefined. 240 * 241 * This function attempts to execute the _PRT method contained in 242 * the object indicated by the passed DeviceHandle. 243 * 244 ******************************************************************************/ 245 246 ACPI_STATUS 247 AcpiGetIrqRoutingTable ( 248 ACPI_HANDLE DeviceHandle, 249 ACPI_BUFFER *RetBuffer) 250 { 251 ACPI_STATUS Status; 252 ACPI_NAMESPACE_NODE *Node; 253 254 255 ACPI_FUNCTION_TRACE (AcpiGetIrqRoutingTable); 256 257 258 /* Validate parameters then dispatch to internal routine */ 259 260 Status = AcpiRsValidateParameters (DeviceHandle, RetBuffer, &Node); 261 if (ACPI_FAILURE (Status)) 262 { 263 return_ACPI_STATUS (Status); 264 } 265 266 Status = AcpiRsGetPrtMethodData (Node, RetBuffer); 267 return_ACPI_STATUS (Status); 268 } 269 270 ACPI_EXPORT_SYMBOL (AcpiGetIrqRoutingTable) 271 272 273 /******************************************************************************* 274 * 275 * FUNCTION: AcpiGetCurrentResources 276 * 277 * PARAMETERS: DeviceHandle - Handle to the device object for the 278 * device we are querying 279 * RetBuffer - Pointer to a buffer to receive the 280 * current resources for the device 281 * 282 * RETURN: Status 283 * 284 * DESCRIPTION: This function is called to get the current resources for a 285 * specific device. The caller must first acquire a handle for 286 * the desired device. The resource data is placed in the buffer 287 * pointed to by the RetBuffer variable parameter. 288 * 289 * If the function fails an appropriate status will be returned 290 * and the value of RetBuffer is undefined. 291 * 292 * This function attempts to execute the _CRS method contained in 293 * the object indicated by the passed DeviceHandle. 294 * 295 ******************************************************************************/ 296 297 ACPI_STATUS 298 AcpiGetCurrentResources ( 299 ACPI_HANDLE DeviceHandle, 300 ACPI_BUFFER *RetBuffer) 301 { 302 ACPI_STATUS Status; 303 ACPI_NAMESPACE_NODE *Node; 304 305 306 ACPI_FUNCTION_TRACE (AcpiGetCurrentResources); 307 308 309 /* Validate parameters then dispatch to internal routine */ 310 311 Status = AcpiRsValidateParameters (DeviceHandle, RetBuffer, &Node); 312 if (ACPI_FAILURE (Status)) 313 { 314 return_ACPI_STATUS (Status); 315 } 316 317 Status = AcpiRsGetCrsMethodData (Node, RetBuffer); 318 return_ACPI_STATUS (Status); 319 } 320 321 ACPI_EXPORT_SYMBOL (AcpiGetCurrentResources) 322 323 324 /******************************************************************************* 325 * 326 * FUNCTION: AcpiGetPossibleResources 327 * 328 * PARAMETERS: DeviceHandle - Handle to the device object for the 329 * device we are querying 330 * RetBuffer - Pointer to a buffer to receive the 331 * resources for the device 332 * 333 * RETURN: Status 334 * 335 * DESCRIPTION: This function is called to get a list of the possible resources 336 * for a specific device. The caller must first acquire a handle 337 * for the desired device. The resource data is placed in the 338 * buffer pointed to by the RetBuffer variable. 339 * 340 * If the function fails an appropriate status will be returned 341 * and the value of RetBuffer is undefined. 342 * 343 ******************************************************************************/ 344 345 ACPI_STATUS 346 AcpiGetPossibleResources ( 347 ACPI_HANDLE DeviceHandle, 348 ACPI_BUFFER *RetBuffer) 349 { 350 ACPI_STATUS Status; 351 ACPI_NAMESPACE_NODE *Node; 352 353 354 ACPI_FUNCTION_TRACE (AcpiGetPossibleResources); 355 356 357 /* Validate parameters then dispatch to internal routine */ 358 359 Status = AcpiRsValidateParameters (DeviceHandle, RetBuffer, &Node); 360 if (ACPI_FAILURE (Status)) 361 { 362 return_ACPI_STATUS (Status); 363 } 364 365 Status = AcpiRsGetPrsMethodData (Node, RetBuffer); 366 return_ACPI_STATUS (Status); 367 } 368 369 ACPI_EXPORT_SYMBOL (AcpiGetPossibleResources) 370 371 372 /******************************************************************************* 373 * 374 * FUNCTION: AcpiSetCurrentResources 375 * 376 * PARAMETERS: DeviceHandle - Handle to the device object for the 377 * device we are setting resources 378 * InBuffer - Pointer to a buffer containing the 379 * resources to be set for the device 380 * 381 * RETURN: Status 382 * 383 * DESCRIPTION: This function is called to set the current resources for a 384 * specific device. The caller must first acquire a handle for 385 * the desired device. The resource data is passed to the routine 386 * the buffer pointed to by the InBuffer variable. 387 * 388 ******************************************************************************/ 389 390 ACPI_STATUS 391 AcpiSetCurrentResources ( 392 ACPI_HANDLE DeviceHandle, 393 ACPI_BUFFER *InBuffer) 394 { 395 ACPI_STATUS Status; 396 ACPI_NAMESPACE_NODE *Node; 397 398 399 ACPI_FUNCTION_TRACE (AcpiSetCurrentResources); 400 401 402 /* Validate the buffer, don't allow zero length */ 403 404 if ((!InBuffer) || 405 (!InBuffer->Pointer) || 406 (!InBuffer->Length)) 407 { 408 return_ACPI_STATUS (AE_BAD_PARAMETER); 409 } 410 411 /* Validate parameters then dispatch to internal routine */ 412 413 Status = AcpiRsValidateParameters (DeviceHandle, InBuffer, &Node); 414 if (ACPI_FAILURE (Status)) 415 { 416 return_ACPI_STATUS (Status); 417 } 418 419 Status = AcpiRsSetSrsMethodData (Node, InBuffer); 420 return_ACPI_STATUS (Status); 421 } 422 423 ACPI_EXPORT_SYMBOL (AcpiSetCurrentResources) 424 425 426 /******************************************************************************* 427 * 428 * FUNCTION: AcpiGetEventResources 429 * 430 * PARAMETERS: DeviceHandle - Handle to the device object for the 431 * device we are getting resources 432 * InBuffer - Pointer to a buffer containing the 433 * resources to be set for the device 434 * 435 * RETURN: Status 436 * 437 * DESCRIPTION: This function is called to get the event resources for a 438 * specific device. The caller must first acquire a handle for 439 * the desired device. The resource data is passed to the routine 440 * the buffer pointed to by the InBuffer variable. Uses the 441 * _AEI method. 442 * 443 ******************************************************************************/ 444 445 ACPI_STATUS 446 AcpiGetEventResources ( 447 ACPI_HANDLE DeviceHandle, 448 ACPI_BUFFER *RetBuffer) 449 { 450 ACPI_STATUS Status; 451 ACPI_NAMESPACE_NODE *Node; 452 453 454 ACPI_FUNCTION_TRACE (AcpiGetEventResources); 455 456 457 /* Validate parameters then dispatch to internal routine */ 458 459 Status = AcpiRsValidateParameters (DeviceHandle, RetBuffer, &Node); 460 if (ACPI_FAILURE (Status)) 461 { 462 return_ACPI_STATUS (Status); 463 } 464 465 Status = AcpiRsGetAeiMethodData (Node, RetBuffer); 466 return_ACPI_STATUS (Status); 467 } 468 469 ACPI_EXPORT_SYMBOL (AcpiGetEventResources) 470 471 472 /****************************************************************************** 473 * 474 * FUNCTION: AcpiResourceToAddress64 475 * 476 * PARAMETERS: Resource - Pointer to a resource 477 * Out - Pointer to the users's return buffer 478 * (a struct acpi_resource_address64) 479 * 480 * RETURN: Status 481 * 482 * DESCRIPTION: If the resource is an address16, address32, or address64, 483 * copy it to the address64 return buffer. This saves the 484 * caller from having to duplicate code for different-sized 485 * addresses. 486 * 487 ******************************************************************************/ 488 489 ACPI_STATUS 490 AcpiResourceToAddress64 ( 491 ACPI_RESOURCE *Resource, 492 ACPI_RESOURCE_ADDRESS64 *Out) 493 { 494 ACPI_RESOURCE_ADDRESS16 *Address16; 495 ACPI_RESOURCE_ADDRESS32 *Address32; 496 497 498 if (!Resource || !Out) 499 { 500 return (AE_BAD_PARAMETER); 501 } 502 503 /* Convert 16 or 32 address descriptor to 64 */ 504 505 switch (Resource->Type) 506 { 507 case ACPI_RESOURCE_TYPE_ADDRESS16: 508 509 Address16 = ACPI_CAST_PTR (ACPI_RESOURCE_ADDRESS16, &Resource->Data); 510 ACPI_COPY_ADDRESS (Out, Address16); 511 break; 512 513 case ACPI_RESOURCE_TYPE_ADDRESS32: 514 515 Address32 = ACPI_CAST_PTR (ACPI_RESOURCE_ADDRESS32, &Resource->Data); 516 ACPI_COPY_ADDRESS (Out, Address32); 517 break; 518 519 case ACPI_RESOURCE_TYPE_ADDRESS64: 520 521 /* Simple copy for 64 bit source */ 522 523 ACPI_MEMCPY (Out, &Resource->Data, sizeof (ACPI_RESOURCE_ADDRESS64)); 524 break; 525 526 default: 527 528 return (AE_BAD_PARAMETER); 529 } 530 531 return (AE_OK); 532 } 533 534 ACPI_EXPORT_SYMBOL (AcpiResourceToAddress64) 535 536 537 /******************************************************************************* 538 * 539 * FUNCTION: AcpiGetVendorResource 540 * 541 * PARAMETERS: DeviceHandle - Handle for the parent device object 542 * Name - Method name for the parent resource 543 * (METHOD_NAME__CRS or METHOD_NAME__PRS) 544 * Uuid - Pointer to the UUID to be matched. 545 * includes both subtype and 16-byte UUID 546 * RetBuffer - Where the vendor resource is returned 547 * 548 * RETURN: Status 549 * 550 * DESCRIPTION: Walk a resource template for the specified device to find a 551 * vendor-defined resource that matches the supplied UUID and 552 * UUID subtype. Returns a ACPI_RESOURCE of type Vendor. 553 * 554 ******************************************************************************/ 555 556 ACPI_STATUS 557 AcpiGetVendorResource ( 558 ACPI_HANDLE DeviceHandle, 559 char *Name, 560 ACPI_VENDOR_UUID *Uuid, 561 ACPI_BUFFER *RetBuffer) 562 { 563 ACPI_VENDOR_WALK_INFO Info; 564 ACPI_STATUS Status; 565 566 567 /* Other parameters are validated by AcpiWalkResources */ 568 569 if (!Uuid || !RetBuffer) 570 { 571 return (AE_BAD_PARAMETER); 572 } 573 574 Info.Uuid = Uuid; 575 Info.Buffer = RetBuffer; 576 Info.Status = AE_NOT_EXIST; 577 578 /* Walk the _CRS or _PRS resource list for this device */ 579 580 Status = AcpiWalkResources (DeviceHandle, Name, AcpiRsMatchVendorResource, 581 &Info); 582 if (ACPI_FAILURE (Status)) 583 { 584 return (Status); 585 } 586 587 return (Info.Status); 588 } 589 590 ACPI_EXPORT_SYMBOL (AcpiGetVendorResource) 591 592 593 /******************************************************************************* 594 * 595 * FUNCTION: AcpiRsMatchVendorResource 596 * 597 * PARAMETERS: ACPI_WALK_RESOURCE_CALLBACK 598 * 599 * RETURN: Status 600 * 601 * DESCRIPTION: Match a vendor resource via the ACPI 3.0 UUID 602 * 603 ******************************************************************************/ 604 605 static ACPI_STATUS 606 AcpiRsMatchVendorResource ( 607 ACPI_RESOURCE *Resource, 608 void *Context) 609 { 610 ACPI_VENDOR_WALK_INFO *Info = Context; 611 ACPI_RESOURCE_VENDOR_TYPED *Vendor; 612 ACPI_BUFFER *Buffer; 613 ACPI_STATUS Status; 614 615 616 /* Ignore all descriptors except Vendor */ 617 618 if (Resource->Type != ACPI_RESOURCE_TYPE_VENDOR) 619 { 620 return (AE_OK); 621 } 622 623 Vendor = &Resource->Data.VendorTyped; 624 625 /* 626 * For a valid match, these conditions must hold: 627 * 628 * 1) Length of descriptor data must be at least as long as a UUID struct 629 * 2) The UUID subtypes must match 630 * 3) The UUID data must match 631 */ 632 if ((Vendor->ByteLength < (ACPI_UUID_LENGTH + 1)) || 633 (Vendor->UuidSubtype != Info->Uuid->Subtype) || 634 (ACPI_MEMCMP (Vendor->Uuid, Info->Uuid->Data, ACPI_UUID_LENGTH))) 635 { 636 return (AE_OK); 637 } 638 639 /* Validate/Allocate/Clear caller buffer */ 640 641 Buffer = Info->Buffer; 642 Status = AcpiUtInitializeBuffer (Buffer, Resource->Length); 643 if (ACPI_FAILURE (Status)) 644 { 645 return (Status); 646 } 647 648 /* Found the correct resource, copy and return it */ 649 650 ACPI_MEMCPY (Buffer->Pointer, Resource, Resource->Length); 651 Buffer->Length = Resource->Length; 652 653 /* Found the desired descriptor, terminate resource walk */ 654 655 Info->Status = AE_OK; 656 return (AE_CTRL_TERMINATE); 657 } 658 659 660 /******************************************************************************* 661 * 662 * FUNCTION: AcpiWalkResourceBuffer 663 * 664 * PARAMETERS: Buffer - Formatted buffer returned by one of the 665 * various Get*Resource functions 666 * UserFunction - Called for each resource 667 * Context - Passed to UserFunction 668 * 669 * RETURN: Status 670 * 671 * DESCRIPTION: Walks the input resource template. The UserFunction is called 672 * once for each resource in the list. 673 * 674 ******************************************************************************/ 675 676 ACPI_STATUS 677 AcpiWalkResourceBuffer ( 678 ACPI_BUFFER *Buffer, 679 ACPI_WALK_RESOURCE_CALLBACK UserFunction, 680 void *Context) 681 { 682 ACPI_STATUS Status = AE_OK; 683 ACPI_RESOURCE *Resource; 684 ACPI_RESOURCE *ResourceEnd; 685 686 687 ACPI_FUNCTION_TRACE (AcpiWalkResourceBuffer); 688 689 690 /* Parameter validation */ 691 692 if (!Buffer || !Buffer->Pointer || !UserFunction) 693 { 694 return_ACPI_STATUS (AE_BAD_PARAMETER); 695 } 696 697 /* Buffer contains the resource list and length */ 698 699 Resource = ACPI_CAST_PTR (ACPI_RESOURCE, Buffer->Pointer); 700 ResourceEnd = ACPI_ADD_PTR (ACPI_RESOURCE, Buffer->Pointer, Buffer->Length); 701 702 /* Walk the resource list until the EndTag is found (or buffer end) */ 703 704 while (Resource < ResourceEnd) 705 { 706 /* Sanity check the resource type */ 707 708 if (Resource->Type > ACPI_RESOURCE_TYPE_MAX) 709 { 710 Status = AE_AML_INVALID_RESOURCE_TYPE; 711 break; 712 } 713 714 /* Sanity check the length. It must not be zero, or we loop forever */ 715 716 if (!Resource->Length) 717 { 718 return_ACPI_STATUS (AE_AML_BAD_RESOURCE_LENGTH); 719 } 720 721 /* Invoke the user function, abort on any error returned */ 722 723 Status = UserFunction (Resource, Context); 724 if (ACPI_FAILURE (Status)) 725 { 726 if (Status == AE_CTRL_TERMINATE) 727 { 728 /* This is an OK termination by the user function */ 729 730 Status = AE_OK; 731 } 732 break; 733 } 734 735 /* EndTag indicates end-of-list */ 736 737 if (Resource->Type == ACPI_RESOURCE_TYPE_END_TAG) 738 { 739 break; 740 } 741 742 /* Get the next resource descriptor */ 743 744 Resource = ACPI_NEXT_RESOURCE (Resource); 745 } 746 747 return_ACPI_STATUS (Status); 748 } 749 750 ACPI_EXPORT_SYMBOL (AcpiWalkResourceBuffer) 751 752 753 /******************************************************************************* 754 * 755 * FUNCTION: AcpiWalkResources 756 * 757 * PARAMETERS: DeviceHandle - Handle to the device object for the 758 * device we are querying 759 * Name - Method name of the resources we want. 760 * (METHOD_NAME__CRS, METHOD_NAME__PRS, or 761 * METHOD_NAME__AEI) 762 * UserFunction - Called for each resource 763 * Context - Passed to UserFunction 764 * 765 * RETURN: Status 766 * 767 * DESCRIPTION: Retrieves the current or possible resource list for the 768 * specified device. The UserFunction is called once for 769 * each resource in the list. 770 * 771 ******************************************************************************/ 772 773 ACPI_STATUS 774 AcpiWalkResources ( 775 ACPI_HANDLE DeviceHandle, 776 char *Name, 777 ACPI_WALK_RESOURCE_CALLBACK UserFunction, 778 void *Context) 779 { 780 ACPI_STATUS Status; 781 ACPI_BUFFER Buffer; 782 783 784 ACPI_FUNCTION_TRACE (AcpiWalkResources); 785 786 787 /* Parameter validation */ 788 789 if (!DeviceHandle || !UserFunction || !Name || 790 (!ACPI_COMPARE_NAME (Name, METHOD_NAME__CRS) && 791 !ACPI_COMPARE_NAME (Name, METHOD_NAME__PRS) && 792 !ACPI_COMPARE_NAME (Name, METHOD_NAME__AEI))) 793 { 794 return_ACPI_STATUS (AE_BAD_PARAMETER); 795 } 796 797 /* Get the _CRS/_PRS/_AEI resource list */ 798 799 Buffer.Length = ACPI_ALLOCATE_LOCAL_BUFFER; 800 Status = AcpiRsGetMethodData (DeviceHandle, Name, &Buffer); 801 if (ACPI_FAILURE (Status)) 802 { 803 return_ACPI_STATUS (Status); 804 } 805 806 /* Walk the resource list and cleanup */ 807 808 Status = AcpiWalkResourceBuffer (&Buffer, UserFunction, Context); 809 ACPI_FREE (Buffer.Pointer); 810 return_ACPI_STATUS (Status); 811 } 812 813 ACPI_EXPORT_SYMBOL (AcpiWalkResources) 814