drivers/acpi/acpica/rsutils.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: rsutils - Utilities for the resource manager
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2013, 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/acpi.h>
  45 #include "accommon.h"
  46 #include "acnamesp.h"
  47 #include "acresrc.h"
  48
  49 #define _COMPONENT          ACPI_RESOURCES
  50 ACPI_MODULE_NAME("rsutils")
  51
  52 /*******************************************************************************
  53  *
  54  * FUNCTION:    acpi_rs_decode_bitmask
  55  *
  56  * PARAMETERS:  mask            - Bitmask to decode
  57  *              list            - Where the converted list is returned
  58  *
  59  * RETURN:      Count of bits set (length of list)
  60  *
  61  * DESCRIPTION: Convert a bit mask into a list of values
  62  *
  63  ******************************************************************************/
  64 u8 acpi_rs_decode_bitmask(u16 mask, u8 * list)
  65 {
  66         u8 i;
  67         u8 bit_count;
  68
  69         ACPI_FUNCTION_ENTRY();
  70
  71         /* Decode the mask bits */
  72
  73         for (i = 0, bit_count = 0; mask; i++) {
  74                 if (mask & 0x0001) {
  75                         list[bit_count] = i;
  76                         bit_count++;
  77                 }
  78
  79                 mask >>= 1;
  80         }
  81
  82         return (bit_count);
  83 }
  84
  85 /*******************************************************************************
  86  *
  87  * FUNCTION:    acpi_rs_encode_bitmask
  88  *
  89  * PARAMETERS:  list            - List of values to encode
  90  *              count           - Length of list
  91  *
  92  * RETURN:      Encoded bitmask
  93  *
  94  * DESCRIPTION: Convert a list of values to an encoded bitmask
  95  *
  96  ******************************************************************************/
  97
  98 u16 acpi_rs_encode_bitmask(u8 * list, u8 count)
  99 {
 100         u32 i;
 101         u16 mask;
 102
 103         ACPI_FUNCTION_ENTRY();
 104
 105         /* Encode the list into a single bitmask */
 106
 107         for (i = 0, mask = 0; i < count; i++) {
 108                 mask |= (0x1 << list[i]);
 109         }
 110
 111         return (mask);
 112 }
 113
 114 /*******************************************************************************
 115  *
 116  * FUNCTION:    acpi_rs_move_data
 117  *
 118  * PARAMETERS:  destination         - Pointer to the destination descriptor
 119  *              source              - Pointer to the source descriptor
 120  *              item_count          - How many items to move
 121  *              move_type           - Byte width
 122  *
 123  * RETURN:      None
 124  *
 125  * DESCRIPTION: Move multiple data items from one descriptor to another. Handles
 126  *              alignment issues and endian issues if necessary, as configured
 127  *              via the ACPI_MOVE_* macros. (This is why a memcpy is not used)
 128  *
 129  ******************************************************************************/
 130
 131 void
 132 acpi_rs_move_data(void *destination, void *source, u16 item_count, u8 move_type)
 133 {
 134         u32 i;
 135
 136         ACPI_FUNCTION_ENTRY();
 137
 138         /* One move per item */
 139
 140         for (i = 0; i < item_count; i++) {
 141                 switch (move_type) {
 142                         /*
 143                          * For the 8-bit case, we can perform the move all at once
 144                          * since there are no alignment or endian issues
 145                          */
 146                 case ACPI_RSC_MOVE8:
 147                 case ACPI_RSC_MOVE_GPIO_RES:
 148                 case ACPI_RSC_MOVE_SERIAL_VEN:
 149                 case ACPI_RSC_MOVE_SERIAL_RES:
 150
 151                         ACPI_MEMCPY(destination, source, item_count);
 152                         return;
 153
 154                         /*
 155                          * 16-, 32-, and 64-bit cases must use the move macros that perform
 156                          * endian conversion and/or accommodate hardware that cannot perform
 157                          * misaligned memory transfers
 158                          */
 159                 case ACPI_RSC_MOVE16:
 160                 case ACPI_RSC_MOVE_GPIO_PIN:
 161
 162                         ACPI_MOVE_16_TO_16(&ACPI_CAST_PTR(u16, destination)[i],
 163                                            &ACPI_CAST_PTR(u16, source)[i]);
 164                         break;
 165
 166                 case ACPI_RSC_MOVE32:
 167
 168                         ACPI_MOVE_32_TO_32(&ACPI_CAST_PTR(u32, destination)[i],
 169                                            &ACPI_CAST_PTR(u32, source)[i]);
 170                         break;
 171
 172                 case ACPI_RSC_MOVE64:
 173
 174                         ACPI_MOVE_64_TO_64(&ACPI_CAST_PTR(u64, destination)[i],
 175                                            &ACPI_CAST_PTR(u64, source)[i]);
 176                         break;
 177
 178                 default:
 179
 180                         return;
 181                 }
 182         }
 183 }
 184
 185 /*******************************************************************************
 186  *
 187  * FUNCTION:    acpi_rs_set_resource_length
 188  *
 189  * PARAMETERS:  total_length        - Length of the AML descriptor, including
 190  *                                    the header and length fields.
 191  *              aml                 - Pointer to the raw AML descriptor
 192  *
 193  * RETURN:      None
 194  *
 195  * DESCRIPTION: Set the resource_length field of an AML
 196  *              resource descriptor, both Large and Small descriptors are
 197  *              supported automatically. Note: Descriptor Type field must
 198  *              be valid.
 199  *
 200  ******************************************************************************/
 201
 202 void
 203 acpi_rs_set_resource_length(acpi_rsdesc_size total_length,
 204                             union aml_resource *aml)
 205 {
 206         acpi_rs_length resource_length;
 207
 208         ACPI_FUNCTION_ENTRY();
 209
 210         /* Length is the total descriptor length minus the header length */
 211
 212         resource_length = (acpi_rs_length)
 213             (total_length - acpi_ut_get_resource_header_length(aml));
 214
 215         /* Length is stored differently for large and small descriptors */
 216
 217         if (aml->small_header.descriptor_type & ACPI_RESOURCE_NAME_LARGE) {
 218
 219                 /* Large descriptor -- bytes 1-2 contain the 16-bit length */
 220
 221                 ACPI_MOVE_16_TO_16(&aml->large_header.resource_length,
 222                                    &resource_length);
 223         } else {
 224                 /* Small descriptor -- bits 2:0 of byte 0 contain the length */
 225
 226                 aml->small_header.descriptor_type = (u8)
 227
 228                     /* Clear any existing length, preserving descriptor type bits */
 229                     ((aml->small_header.
 230                       descriptor_type & ~ACPI_RESOURCE_NAME_SMALL_LENGTH_MASK)
 231
 232                      | resource_length);
 233         }
 234 }
 235
 236 /*******************************************************************************
 237  *
 238  * FUNCTION:    acpi_rs_set_resource_header
 239  *
 240  * PARAMETERS:  descriptor_type     - Byte to be inserted as the type
 241  *              total_length        - Length of the AML descriptor, including
 242  *                                    the header and length fields.
 243  *              aml                 - Pointer to the raw AML descriptor
 244  *
 245  * RETURN:      None
 246  *
 247  * DESCRIPTION: Set the descriptor_type and resource_length fields of an AML
 248  *              resource descriptor, both Large and Small descriptors are
 249  *              supported automatically
 250  *
 251  ******************************************************************************/
 252
 253 void
 254 acpi_rs_set_resource_header(u8 descriptor_type,
 255                             acpi_rsdesc_size total_length,
 256                             union aml_resource *aml)
 257 {
 258         ACPI_FUNCTION_ENTRY();
 259
 260         /* Set the Resource Type */
 261
 262         aml->small_header.descriptor_type = descriptor_type;
 263
 264         /* Set the Resource Length */
 265
 266         acpi_rs_set_resource_length(total_length, aml);
 267 }
 268
 269 /*******************************************************************************
 270  *
 271  * FUNCTION:    acpi_rs_strcpy
 272  *
 273  * PARAMETERS:  destination         - Pointer to the destination string
 274  *              source              - Pointer to the source string
 275  *
 276  * RETURN:      String length, including NULL terminator
 277  *
 278  * DESCRIPTION: Local string copy that returns the string length, saving a
 279  *              strcpy followed by a strlen.
 280  *
 281  ******************************************************************************/
 282
 283 static u16 acpi_rs_strcpy(char *destination, char *source)
 284 {
 285         u16 i;
 286
 287         ACPI_FUNCTION_ENTRY();
 288
 289         for (i = 0; source[i]; i++) {
 290                 destination[i] = source[i];
 291         }
 292
 293         destination[i] = 0;
 294
 295         /* Return string length including the NULL terminator */
 296
 297         return ((u16) (i + 1));
 298 }
 299
 300 /*******************************************************************************
 301  *
 302  * FUNCTION:    acpi_rs_get_resource_source
 303  *
 304  * PARAMETERS:  resource_length     - Length field of the descriptor
 305  *              minimum_length      - Minimum length of the descriptor (minus
 306  *                                    any optional fields)
 307  *              resource_source     - Where the resource_source is returned
 308  *              aml                 - Pointer to the raw AML descriptor
 309  *              string_ptr          - (optional) where to store the actual
 310  *                                    resource_source string
 311  *
 312  * RETURN:      Length of the string plus NULL terminator, rounded up to native
 313  *              word boundary
 314  *
 315  * DESCRIPTION: Copy the optional resource_source data from a raw AML descriptor
 316  *              to an internal resource descriptor
 317  *
 318  ******************************************************************************/
 319
 320 acpi_rs_length
 321 acpi_rs_get_resource_source(acpi_rs_length resource_length,
 322                             acpi_rs_length minimum_length,
 323                             struct acpi_resource_source * resource_source,
 324                             union aml_resource * aml, char *string_ptr)
 325 {
 326         acpi_rsdesc_size total_length;
 327         u8 *aml_resource_source;
 328
 329         ACPI_FUNCTION_ENTRY();
 330
 331         total_length =
 332             resource_length + sizeof(struct aml_resource_large_header);
 333         aml_resource_source = ACPI_ADD_PTR(u8, aml, minimum_length);
 334
 335         /*
 336          * resource_source is present if the length of the descriptor is longer than
 337          * the minimum length.
 338          *
 339          * Note: Some resource descriptors will have an additional null, so
 340          * we add 1 to the minimum length.
 341          */
 342         if (total_length > (acpi_rsdesc_size) (minimum_length + 1)) {
 343
 344                 /* Get the resource_source_index */
 345
 346                 resource_source->index = aml_resource_source[0];
 347
 348                 resource_source->string_ptr = string_ptr;
 349                 if (!string_ptr) {
 350                         /*
 351                          * String destination pointer is not specified; Set the String
 352                          * pointer to the end of the current resource_source structure.
 353                          */
 354                         resource_source->string_ptr =
 355                             ACPI_ADD_PTR(char, resource_source,
 356                                          sizeof(struct acpi_resource_source));
 357                 }
 358
 359                 /*
 360                  * In order for the Resource length to be a multiple of the native
 361                  * word, calculate the length of the string (+1 for NULL terminator)
 362                  * and expand to the next word multiple.
 363                  *
 364                  * Zero the entire area of the buffer.
 365                  */
 366                 total_length =
 367                     (u32)
 368                     ACPI_STRLEN(ACPI_CAST_PTR(char, &aml_resource_source[1])) +
 369                     1;
 370                 total_length = (u32) ACPI_ROUND_UP_TO_NATIVE_WORD(total_length);
 371
 372                 ACPI_MEMSET(resource_source->string_ptr, 0, total_length);
 373
 374                 /* Copy the resource_source string to the destination */
 375
 376                 resource_source->string_length =
 377                     acpi_rs_strcpy(resource_source->string_ptr,
 378                                    ACPI_CAST_PTR(char,
 379                                                  &aml_resource_source[1]));
 380
 381                 return ((acpi_rs_length) total_length);
 382         }
 383
 384         /* resource_source is not present */
 385
 386         resource_source->index = 0;
 387         resource_source->string_length = 0;
 388         resource_source->string_ptr = NULL;
 389         return (0);
 390 }
 391
 392 /*******************************************************************************
 393  *
 394  * FUNCTION:    acpi_rs_set_resource_source
 395  *
 396  * PARAMETERS:  aml                 - Pointer to the raw AML descriptor
 397  *              minimum_length      - Minimum length of the descriptor (minus
 398  *                                    any optional fields)
 399  *              resource_source     - Internal resource_source
 400
 401  *
 402  * RETURN:      Total length of the AML descriptor
 403  *
 404  * DESCRIPTION: Convert an optional resource_source from internal format to a
 405  *              raw AML resource descriptor
 406  *
 407  ******************************************************************************/
 408
 409 acpi_rsdesc_size
 410 acpi_rs_set_resource_source(union aml_resource * aml,
 411                             acpi_rs_length minimum_length,
 412                             struct acpi_resource_source * resource_source)
 413 {
 414         u8 *aml_resource_source;
 415         acpi_rsdesc_size descriptor_length;
 416
 417         ACPI_FUNCTION_ENTRY();
 418
 419         descriptor_length = minimum_length;
 420
 421         /* Non-zero string length indicates presence of a resource_source */
 422
 423         if (resource_source->string_length) {
 424
 425                 /* Point to the end of the AML descriptor */
 426
 427                 aml_resource_source = ACPI_ADD_PTR(u8, aml, minimum_length);
 428
 429                 /* Copy the resource_source_index */
 430
 431                 aml_resource_source[0] = (u8) resource_source->index;
 432
 433                 /* Copy the resource_source string */
 434
 435                 ACPI_STRCPY(ACPI_CAST_PTR(char, &aml_resource_source[1]),
 436                             resource_source->string_ptr);
 437
 438                 /*
 439                  * Add the length of the string (+ 1 for null terminator) to the
 440                  * final descriptor length
 441                  */
 442                 descriptor_length +=
 443                     ((acpi_rsdesc_size) resource_source->string_length + 1);
 444         }
 445
 446         /* Return the new total length of the AML descriptor */
 447
 448         return (descriptor_length);
 449 }
 450
 451 /*******************************************************************************
 452  *
 453  * FUNCTION:    acpi_rs_get_prt_method_data
 454  *
 455  * PARAMETERS:  node            - Device node
 456  *              ret_buffer      - Pointer to a buffer structure for the
 457  *                                results
 458  *
 459  * RETURN:      Status
 460  *
 461  * DESCRIPTION: This function is called to get the _PRT value of an object
 462  *              contained in an object specified by the handle passed in
 463  *
 464  *              If the function fails an appropriate status will be returned
 465  *              and the contents of the callers buffer is undefined.
 466  *
 467  ******************************************************************************/
 468
 469 acpi_status
 470 acpi_rs_get_prt_method_data(struct acpi_namespace_node * node,
 471                             struct acpi_buffer * ret_buffer)
 472 {
 473         union acpi_operand_object *obj_desc;
 474         acpi_status status;
 475
 476         ACPI_FUNCTION_TRACE(rs_get_prt_method_data);
 477
 478         /* Parameters guaranteed valid by caller */
 479
 480         /* Execute the method, no parameters */
 481
 482         status = acpi_ut_evaluate_object(node, METHOD_NAME__PRT,
 483                                          ACPI_BTYPE_PACKAGE, &obj_desc);
 484         if (ACPI_FAILURE(status)) {
 485                 return_ACPI_STATUS(status);
 486         }
 487
 488         /*
 489          * Create a resource linked list from the byte stream buffer that comes
 490          * back from the _CRS method execution.
 491          */
 492         status = acpi_rs_create_pci_routing_table(obj_desc, ret_buffer);
 493
 494         /* On exit, we must delete the object returned by evaluate_object */
 495
 496         acpi_ut_remove_reference(obj_desc);
 497         return_ACPI_STATUS(status);
 498 }
 499
 500 /*******************************************************************************
 501  *
 502  * FUNCTION:    acpi_rs_get_crs_method_data
 503  *
 504  * PARAMETERS:  node            - Device node
 505  *              ret_buffer      - Pointer to a buffer structure for the
 506  *                                results
 507  *
 508  * RETURN:      Status
 509  *
 510  * DESCRIPTION: This function is called to get the _CRS value of an object
 511  *              contained in an object specified by the handle passed in
 512  *
 513  *              If the function fails an appropriate status will be returned
 514  *              and the contents of the callers buffer is undefined.
 515  *
 516  ******************************************************************************/
 517
 518 acpi_status
 519 acpi_rs_get_crs_method_data(struct acpi_namespace_node *node,
 520                             struct acpi_buffer *ret_buffer)
 521 {
 522         union acpi_operand_object *obj_desc;
 523         acpi_status status;
 524
 525         ACPI_FUNCTION_TRACE(rs_get_crs_method_data);
 526
 527         /* Parameters guaranteed valid by caller */
 528
 529         /* Execute the method, no parameters */
 530
 531         status = acpi_ut_evaluate_object(node, METHOD_NAME__CRS,
 532                                          ACPI_BTYPE_BUFFER, &obj_desc);
 533         if (ACPI_FAILURE(status)) {
 534                 return_ACPI_STATUS(status);
 535         }
 536
 537         /*
 538          * Make the call to create a resource linked list from the
 539          * byte stream buffer that comes back from the _CRS method
 540          * execution.
 541          */
 542         status = acpi_rs_create_resource_list(obj_desc, ret_buffer);
 543
 544         /* On exit, we must delete the object returned by evaluateObject */
 545
 546         acpi_ut_remove_reference(obj_desc);
 547         return_ACPI_STATUS(status);
 548 }
 549
 550 /*******************************************************************************
 551  *
 552  * FUNCTION:    acpi_rs_get_prs_method_data
 553  *
 554  * PARAMETERS:  node            - Device node
 555  *              ret_buffer      - Pointer to a buffer structure for the
 556  *                                results
 557  *
 558  * RETURN:      Status
 559  *
 560  * DESCRIPTION: This function is called to get the _PRS value of an object
 561  *              contained in an object specified by the handle passed in
 562  *
 563  *              If the function fails an appropriate status will be returned
 564  *              and the contents of the callers buffer is undefined.
 565  *
 566  ******************************************************************************/
 567
 568 #ifdef ACPI_FUTURE_USAGE
 569 acpi_status
 570 acpi_rs_get_prs_method_data(struct acpi_namespace_node *node,
 571                             struct acpi_buffer *ret_buffer)
 572 {
 573         union acpi_operand_object *obj_desc;
 574         acpi_status status;
 575
 576         ACPI_FUNCTION_TRACE(rs_get_prs_method_data);
 577
 578         /* Parameters guaranteed valid by caller */
 579
 580         /* Execute the method, no parameters */
 581
 582         status = acpi_ut_evaluate_object(node, METHOD_NAME__PRS,
 583                                          ACPI_BTYPE_BUFFER, &obj_desc);
 584         if (ACPI_FAILURE(status)) {
 585                 return_ACPI_STATUS(status);
 586         }
 587
 588         /*
 589          * Make the call to create a resource linked list from the
 590          * byte stream buffer that comes back from the _CRS method
 591          * execution.
 592          */
 593         status = acpi_rs_create_resource_list(obj_desc, ret_buffer);
 594
 595         /* On exit, we must delete the object returned by evaluateObject */
 596
 597         acpi_ut_remove_reference(obj_desc);
 598         return_ACPI_STATUS(status);
 599 }
 600 #endif                          /*  ACPI_FUTURE_USAGE  */
 601
 602 /*******************************************************************************
 603  *
 604  * FUNCTION:    acpi_rs_get_aei_method_data
 605  *
 606  * PARAMETERS:  node            - Device node
 607  *              ret_buffer      - Pointer to a buffer structure for the
 608  *                                results
 609  *
 610  * RETURN:      Status
 611  *
 612  * DESCRIPTION: This function is called to get the _AEI value of an object
 613  *              contained in an object specified by the handle passed in
 614  *
 615  *              If the function fails an appropriate status will be returned
 616  *              and the contents of the callers buffer is undefined.
 617  *
 618  ******************************************************************************/
 619
 620 acpi_status
 621 acpi_rs_get_aei_method_data(struct acpi_namespace_node *node,
 622                             struct acpi_buffer *ret_buffer)
 623 {
 624         union acpi_operand_object *obj_desc;
 625         acpi_status status;
 626
 627         ACPI_FUNCTION_TRACE(rs_get_aei_method_data);
 628
 629         /* Parameters guaranteed valid by caller */
 630
 631         /* Execute the method, no parameters */
 632
 633         status = acpi_ut_evaluate_object(node, METHOD_NAME__AEI,
 634                                          ACPI_BTYPE_BUFFER, &obj_desc);
 635         if (ACPI_FAILURE(status)) {
 636                 return_ACPI_STATUS(status);
 637         }
 638
 639         /*
 640          * Make the call to create a resource linked list from the
 641          * byte stream buffer that comes back from the _CRS method
 642          * execution.
 643          */
 644         status = acpi_rs_create_resource_list(obj_desc, ret_buffer);
 645
 646         /* On exit, we must delete the object returned by evaluateObject */
 647
 648         acpi_ut_remove_reference(obj_desc);
 649         return_ACPI_STATUS(status);
 650 }
 651
 652 /*******************************************************************************
 653  *
 654  * FUNCTION:    acpi_rs_get_method_data
 655  *
 656  * PARAMETERS:  handle          - Handle to the containing object
 657  *              path            - Path to method, relative to Handle
 658  *              ret_buffer      - Pointer to a buffer structure for the
 659  *                                results
 660  *
 661  * RETURN:      Status
 662  *
 663  * DESCRIPTION: This function is called to get the _CRS or _PRS value of an
 664  *              object contained in an object specified by the handle passed in
 665  *
 666  *              If the function fails an appropriate status will be returned
 667  *              and the contents of the callers buffer is undefined.
 668  *
 669  ******************************************************************************/
 670
 671 acpi_status
 672 acpi_rs_get_method_data(acpi_handle handle,
 673                         char *path, struct acpi_buffer *ret_buffer)
 674 {
 675         union acpi_operand_object *obj_desc;
 676         acpi_status status;
 677
 678         ACPI_FUNCTION_TRACE(rs_get_method_data);
 679
 680         /* Parameters guaranteed valid by caller */
 681
 682         /* Execute the method, no parameters */
 683
 684         status =
 685             acpi_ut_evaluate_object(ACPI_CAST_PTR
 686                                     (struct acpi_namespace_node, handle), path,
 687                                     ACPI_BTYPE_BUFFER, &obj_desc);
 688         if (ACPI_FAILURE(status)) {
 689                 return_ACPI_STATUS(status);
 690         }
 691
 692         /*
 693          * Make the call to create a resource linked list from the
 694          * byte stream buffer that comes back from the method
 695          * execution.
 696          */
 697         status = acpi_rs_create_resource_list(obj_desc, ret_buffer);
 698
 699         /* On exit, we must delete the object returned by evaluate_object */
 700
 701         acpi_ut_remove_reference(obj_desc);
 702         return_ACPI_STATUS(status);
 703 }
 704
 705 /*******************************************************************************
 706  *
 707  * FUNCTION:    acpi_rs_set_srs_method_data
 708  *
 709  * PARAMETERS:  node            - Device node
 710  *              in_buffer       - Pointer to a buffer structure of the
 711  *                                parameter
 712  *
 713  * RETURN:      Status
 714  *
 715  * DESCRIPTION: This function is called to set the _SRS of an object contained
 716  *              in an object specified by the handle passed in
 717  *
 718  *              If the function fails an appropriate status will be returned
 719  *              and the contents of the callers buffer is undefined.
 720  *
 721  * Note: Parameters guaranteed valid by caller
 722  *
 723  ******************************************************************************/
 724
 725 acpi_status
 726 acpi_rs_set_srs_method_data(struct acpi_namespace_node *node,
 727                             struct acpi_buffer *in_buffer)
 728 {
 729         struct acpi_evaluate_info *info;
 730         union acpi_operand_object *args[2];
 731         acpi_status status;
 732         struct acpi_buffer buffer;
 733
 734         ACPI_FUNCTION_TRACE(rs_set_srs_method_data);
 735
 736         /* Allocate and initialize the evaluation information block */
 737
 738         info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
 739         if (!info) {
 740                 return_ACPI_STATUS(AE_NO_MEMORY);
 741         }
 742
 743         info->prefix_node = node;
 744         info->relative_pathname = METHOD_NAME__SRS;
 745         info->parameters = args;
 746         info->flags = ACPI_IGNORE_RETURN_VALUE;
 747
 748         /*
 749          * The in_buffer parameter will point to a linked list of
 750          * resource parameters. It needs to be formatted into a
 751          * byte stream to be sent in as an input parameter to _SRS
 752          *
 753          * Convert the linked list into a byte stream
 754          */
 755         buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
 756         status = acpi_rs_create_aml_resources(in_buffer->pointer, &buffer);
 757         if (ACPI_FAILURE(status)) {
 758                 goto cleanup;
 759         }
 760
 761         /* Create and initialize the method parameter object */
 762
 763         args[0] = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER);
 764         if (!args[0]) {
 765                 /*
 766                  * Must free the buffer allocated above (otherwise it is freed
 767                  * later)
 768                  */
 769                 ACPI_FREE(buffer.pointer);
 770                 status = AE_NO_MEMORY;
 771                 goto cleanup;
 772         }
 773
 774         args[0]->buffer.length = (u32) buffer.length;
 775         args[0]->buffer.pointer = buffer.pointer;
 776         args[0]->common.flags = AOPOBJ_DATA_VALID;
 777         args[1] = NULL;
 778
 779         /* Execute the method, no return value is expected */
 780
 781         status = acpi_ns_evaluate(info);
 782
 783         /* Clean up and return the status from acpi_ns_evaluate */
 784
 785         acpi_ut_remove_reference(args[0]);
 786
 787       cleanup:
 788         ACPI_FREE(info);
 789         return_ACPI_STATUS(status);
 790 }