1/******************************************************************************* 2 * 3 * Module Name: rsutils - Utilities for the resource manager 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/acpi.h> 45#include "accommon.h" 46#include "acnamesp.h" 47#include "acresrc.h" 48 49#define _COMPONENT ACPI_RESOURCES 50ACPI_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 ******************************************************************************/ 64u8 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 98u16 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 131void 132acpi_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 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 202void 203acpi_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 /* 225 * Small descriptor -- bits 2:0 of byte 0 contain the length 226 * Clear any existing length, preserving descriptor type bits 227 */ 228 aml->small_header.descriptor_type = (u8) 229 ((aml->small_header.descriptor_type & 230 ~ACPI_RESOURCE_NAME_SMALL_LENGTH_MASK) 231 | resource_length); 232 } 233} 234 235/******************************************************************************* 236 * 237 * FUNCTION: acpi_rs_set_resource_header 238 * 239 * PARAMETERS: descriptor_type - Byte to be inserted as the type 240 * total_length - Length of the AML descriptor, including 241 * the header and length fields. 242 * aml - Pointer to the raw AML descriptor 243 * 244 * RETURN: None 245 * 246 * DESCRIPTION: Set the descriptor_type and resource_length fields of an AML 247 * resource descriptor, both Large and Small descriptors are 248 * supported automatically 249 * 250 ******************************************************************************/ 251 252void 253acpi_rs_set_resource_header(u8 descriptor_type, 254 acpi_rsdesc_size total_length, 255 union aml_resource *aml) 256{ 257 ACPI_FUNCTION_ENTRY(); 258 259 /* Set the Resource Type */ 260 261 aml->small_header.descriptor_type = descriptor_type; 262 263 /* Set the Resource Length */ 264 265 acpi_rs_set_resource_length(total_length, aml); 266} 267 268/******************************************************************************* 269 * 270 * FUNCTION: acpi_rs_strcpy 271 * 272 * PARAMETERS: destination - Pointer to the destination string 273 * source - Pointer to the source string 274 * 275 * RETURN: String length, including NULL terminator 276 * 277 * DESCRIPTION: Local string copy that returns the string length, saving a 278 * strcpy followed by a strlen. 279 * 280 ******************************************************************************/ 281 282static u16 acpi_rs_strcpy(char *destination, char *source) 283{ 284 u16 i; 285 286 ACPI_FUNCTION_ENTRY(); 287 288 for (i = 0; source[i]; i++) { 289 destination[i] = source[i]; 290 } 291 292 destination[i] = 0; 293 294 /* Return string length including the NULL terminator */ 295 296 return ((u16) (i + 1)); 297} 298 299/******************************************************************************* 300 * 301 * FUNCTION: acpi_rs_get_resource_source 302 * 303 * PARAMETERS: resource_length - Length field of the descriptor 304 * minimum_length - Minimum length of the descriptor (minus 305 * any optional fields) 306 * resource_source - Where the resource_source is returned 307 * aml - Pointer to the raw AML descriptor 308 * string_ptr - (optional) where to store the actual 309 * resource_source string 310 * 311 * RETURN: Length of the string plus NULL terminator, rounded up to native 312 * word boundary 313 * 314 * DESCRIPTION: Copy the optional resource_source data from a raw AML descriptor 315 * to an internal resource descriptor 316 * 317 ******************************************************************************/ 318 319acpi_rs_length 320acpi_rs_get_resource_source(acpi_rs_length resource_length, 321 acpi_rs_length minimum_length, 322 struct acpi_resource_source * resource_source, 323 union aml_resource * aml, char *string_ptr) 324{ 325 acpi_rsdesc_size total_length; 326 u8 *aml_resource_source; 327 328 ACPI_FUNCTION_ENTRY(); 329 330 total_length = 331 resource_length + sizeof(struct aml_resource_large_header); 332 aml_resource_source = ACPI_ADD_PTR(u8, aml, minimum_length); 333 334 /* 335 * resource_source is present if the length of the descriptor is longer 336 * than the minimum length. 337 * 338 * Note: Some resource descriptors will have an additional null, so 339 * we add 1 to the minimum length. 340 */ 341 if (total_length > (acpi_rsdesc_size) (minimum_length + 1)) { 342 343 /* Get the resource_source_index */ 344 345 resource_source->index = aml_resource_source[0]; 346 347 resource_source->string_ptr = string_ptr; 348 if (!string_ptr) { 349 /* 350 * String destination pointer is not specified; Set the String 351 * pointer to the end of the current resource_source structure. 352 */ 353 resource_source->string_ptr = 354 ACPI_ADD_PTR(char, resource_source, 355 sizeof(struct acpi_resource_source)); 356 } 357 358 /* 359 * In order for the Resource length to be a multiple of the native 360 * word, calculate the length of the string (+1 for NULL terminator) 361 * and expand to the next word multiple. 362 * 363 * Zero the entire area of the buffer. 364 */ 365 total_length = 366 (u32)strlen(ACPI_CAST_PTR(char, &aml_resource_source[1])) + 367 1; 368 369 total_length = (u32)ACPI_ROUND_UP_TO_NATIVE_WORD(total_length); 370 371 memset(resource_source->string_ptr, 0, total_length); 372 373 /* Copy the resource_source string to the destination */ 374 375 resource_source->string_length = 376 acpi_rs_strcpy(resource_source->string_ptr, 377 ACPI_CAST_PTR(char, 378 &aml_resource_source[1])); 379 380 return ((acpi_rs_length) total_length); 381 } 382 383 /* resource_source is not present */ 384 385 resource_source->index = 0; 386 resource_source->string_length = 0; 387 resource_source->string_ptr = NULL; 388 return (0); 389} 390 391/******************************************************************************* 392 * 393 * FUNCTION: acpi_rs_set_resource_source 394 * 395 * PARAMETERS: aml - Pointer to the raw AML descriptor 396 * minimum_length - Minimum length of the descriptor (minus 397 * any optional fields) 398 * resource_source - Internal resource_source 399 400 * 401 * RETURN: Total length of the AML descriptor 402 * 403 * DESCRIPTION: Convert an optional resource_source from internal format to a 404 * raw AML resource descriptor 405 * 406 ******************************************************************************/ 407 408acpi_rsdesc_size 409acpi_rs_set_resource_source(union aml_resource * aml, 410 acpi_rs_length minimum_length, 411 struct acpi_resource_source * resource_source) 412{ 413 u8 *aml_resource_source; 414 acpi_rsdesc_size descriptor_length; 415 416 ACPI_FUNCTION_ENTRY(); 417 418 descriptor_length = minimum_length; 419 420 /* Non-zero string length indicates presence of a resource_source */ 421 422 if (resource_source->string_length) { 423 424 /* Point to the end of the AML descriptor */ 425 426 aml_resource_source = ACPI_ADD_PTR(u8, aml, minimum_length); 427 428 /* Copy the resource_source_index */ 429 430 aml_resource_source[0] = (u8) resource_source->index; 431 432 /* Copy the resource_source string */ 433 434 strcpy(ACPI_CAST_PTR(char, &aml_resource_source[1]), 435 resource_source->string_ptr); 436 437 /* 438 * Add the length of the string (+ 1 for null terminator) to the 439 * final descriptor length 440 */ 441 descriptor_length += ((acpi_rsdesc_size) 442 resource_source->string_length + 1); 443 } 444 445 /* Return the new total length of the AML descriptor */ 446 447 return (descriptor_length); 448} 449 450/******************************************************************************* 451 * 452 * FUNCTION: acpi_rs_get_prt_method_data 453 * 454 * PARAMETERS: node - Device node 455 * ret_buffer - Pointer to a buffer structure for the 456 * results 457 * 458 * RETURN: Status 459 * 460 * DESCRIPTION: This function is called to get the _PRT value of an object 461 * contained in an object specified by the handle passed in 462 * 463 * If the function fails an appropriate status will be returned 464 * and the contents of the callers buffer is undefined. 465 * 466 ******************************************************************************/ 467 468acpi_status 469acpi_rs_get_prt_method_data(struct acpi_namespace_node * node, 470 struct acpi_buffer * ret_buffer) 471{ 472 union acpi_operand_object *obj_desc; 473 acpi_status status; 474 475 ACPI_FUNCTION_TRACE(rs_get_prt_method_data); 476 477 /* Parameters guaranteed valid by caller */ 478 479 /* Execute the method, no parameters */ 480 481 status = 482 acpi_ut_evaluate_object(node, METHOD_NAME__PRT, ACPI_BTYPE_PACKAGE, 483 &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 518acpi_status 519acpi_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 = 532 acpi_ut_evaluate_object(node, METHOD_NAME__CRS, ACPI_BTYPE_BUFFER, 533 &obj_desc); 534 if (ACPI_FAILURE(status)) { 535 return_ACPI_STATUS(status); 536 } 537 538 /* 539 * Make the call to create a resource linked list from the 540 * byte stream buffer that comes back from the _CRS method 541 * execution. 542 */ 543 status = acpi_rs_create_resource_list(obj_desc, ret_buffer); 544 545 /* On exit, we must delete the object returned by evaluateObject */ 546 547 acpi_ut_remove_reference(obj_desc); 548 return_ACPI_STATUS(status); 549} 550 551/******************************************************************************* 552 * 553 * FUNCTION: acpi_rs_get_prs_method_data 554 * 555 * PARAMETERS: node - Device node 556 * ret_buffer - Pointer to a buffer structure for the 557 * results 558 * 559 * RETURN: Status 560 * 561 * DESCRIPTION: This function is called to get the _PRS value of an object 562 * contained in an object specified by the handle passed in 563 * 564 * If the function fails an appropriate status will be returned 565 * and the contents of the callers buffer is undefined. 566 * 567 ******************************************************************************/ 568 569acpi_status 570acpi_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 = 583 acpi_ut_evaluate_object(node, METHOD_NAME__PRS, ACPI_BTYPE_BUFFER, 584 &obj_desc); 585 if (ACPI_FAILURE(status)) { 586 return_ACPI_STATUS(status); 587 } 588 589 /* 590 * Make the call to create a resource linked list from the 591 * byte stream buffer that comes back from the _CRS method 592 * execution. 593 */ 594 status = acpi_rs_create_resource_list(obj_desc, ret_buffer); 595 596 /* On exit, we must delete the object returned by evaluateObject */ 597 598 acpi_ut_remove_reference(obj_desc); 599 return_ACPI_STATUS(status); 600} 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 620acpi_status 621acpi_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 = 634 acpi_ut_evaluate_object(node, METHOD_NAME__AEI, ACPI_BTYPE_BUFFER, 635 &obj_desc); 636 if (ACPI_FAILURE(status)) { 637 return_ACPI_STATUS(status); 638 } 639 640 /* 641 * Make the call to create a resource linked list from the 642 * byte stream buffer that comes back from the _CRS method 643 * execution. 644 */ 645 status = acpi_rs_create_resource_list(obj_desc, ret_buffer); 646 647 /* On exit, we must delete the object returned by evaluateObject */ 648 649 acpi_ut_remove_reference(obj_desc); 650 return_ACPI_STATUS(status); 651} 652 653/******************************************************************************* 654 * 655 * FUNCTION: acpi_rs_get_method_data 656 * 657 * PARAMETERS: handle - Handle to the containing object 658 * path - Path to method, relative to Handle 659 * ret_buffer - Pointer to a buffer structure for the 660 * results 661 * 662 * RETURN: Status 663 * 664 * DESCRIPTION: This function is called to get the _CRS or _PRS value of an 665 * object contained in an object specified by the handle passed in 666 * 667 * If the function fails an appropriate status will be returned 668 * and the contents of the callers buffer is undefined. 669 * 670 ******************************************************************************/ 671 672acpi_status 673acpi_rs_get_method_data(acpi_handle handle, 674 char *path, struct acpi_buffer *ret_buffer) 675{ 676 union acpi_operand_object *obj_desc; 677 acpi_status status; 678 679 ACPI_FUNCTION_TRACE(rs_get_method_data); 680 681 /* Parameters guaranteed valid by caller */ 682 683 /* Execute the method, no parameters */ 684 685 status = 686 acpi_ut_evaluate_object(ACPI_CAST_PTR 687 (struct acpi_namespace_node, handle), path, 688 ACPI_BTYPE_BUFFER, &obj_desc); 689 if (ACPI_FAILURE(status)) { 690 return_ACPI_STATUS(status); 691 } 692 693 /* 694 * Make the call to create a resource linked list from the 695 * byte stream buffer that comes back from the method 696 * execution. 697 */ 698 status = acpi_rs_create_resource_list(obj_desc, ret_buffer); 699 700 /* On exit, we must delete the object returned by evaluate_object */ 701 702 acpi_ut_remove_reference(obj_desc); 703 return_ACPI_STATUS(status); 704} 705 706/******************************************************************************* 707 * 708 * FUNCTION: acpi_rs_set_srs_method_data 709 * 710 * PARAMETERS: node - Device node 711 * in_buffer - Pointer to a buffer structure of the 712 * parameter 713 * 714 * RETURN: Status 715 * 716 * DESCRIPTION: This function is called to set the _SRS of an object contained 717 * in an object specified by the handle passed in 718 * 719 * If the function fails an appropriate status will be returned 720 * and the contents of the callers buffer is undefined. 721 * 722 * Note: Parameters guaranteed valid by caller 723 * 724 ******************************************************************************/ 725 726acpi_status 727acpi_rs_set_srs_method_data(struct acpi_namespace_node *node, 728 struct acpi_buffer *in_buffer) 729{ 730 struct acpi_evaluate_info *info; 731 union acpi_operand_object *args[2]; 732 acpi_status status; 733 struct acpi_buffer buffer; 734 735 ACPI_FUNCTION_TRACE(rs_set_srs_method_data); 736 737 /* Allocate and initialize the evaluation information block */ 738 739 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); 740 if (!info) { 741 return_ACPI_STATUS(AE_NO_MEMORY); 742 } 743 744 info->prefix_node = node; 745 info->relative_pathname = METHOD_NAME__SRS; 746 info->parameters = args; 747 info->flags = ACPI_IGNORE_RETURN_VALUE; 748 749 /* 750 * The in_buffer parameter will point to a linked list of 751 * resource parameters. It needs to be formatted into a 752 * byte stream to be sent in as an input parameter to _SRS 753 * 754 * Convert the linked list into a byte stream 755 */ 756 buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER; 757 status = acpi_rs_create_aml_resources(in_buffer, &buffer); 758 if (ACPI_FAILURE(status)) { 759 goto cleanup; 760 } 761 762 /* Create and initialize the method parameter object */ 763 764 args[0] = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER); 765 if (!args[0]) { 766 /* 767 * Must free the buffer allocated above (otherwise it is freed 768 * later) 769 */ 770 ACPI_FREE(buffer.pointer); 771 status = AE_NO_MEMORY; 772 goto cleanup; 773 } 774 775 args[0]->buffer.length = (u32) buffer.length; 776 args[0]->buffer.pointer = buffer.pointer; 777 args[0]->common.flags = AOPOBJ_DATA_VALID; 778 args[1] = NULL; 779 780 /* Execute the method, no return value is expected */ 781 782 status = acpi_ns_evaluate(info); 783 784 /* Clean up and return the status from acpi_ns_evaluate */ 785 786 acpi_ut_remove_reference(args[0]); 787 788cleanup: 789 ACPI_FREE(info); 790 return_ACPI_STATUS(status); 791} 792