err.no Git - linux-2.6/blob - drivers/acpi/utilities/utcopy.c

   1 /******************************************************************************
   2  *
   3  * Module Name: utcopy - Internal to external object translation utilities
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2007, R. Byron Moore
   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 <acpi/amlcode.h>
  46
  47 #define _COMPONENT          ACPI_UTILITIES
  48 ACPI_MODULE_NAME("utcopy")
  49
  50 /* Local prototypes */
  51 static acpi_status
  52 acpi_ut_copy_isimple_to_esimple(union acpi_operand_object *internal_object,
  53                                 union acpi_object *external_object,
  54                                 u8 * data_space, acpi_size * buffer_space_used);
  55
  56 static acpi_status
  57 acpi_ut_copy_ielement_to_ielement(u8 object_type,
  58                                   union acpi_operand_object *source_object,
  59                                   union acpi_generic_state *state,
  60                                   void *context);
  61
  62 static acpi_status
  63 acpi_ut_copy_ipackage_to_epackage(union acpi_operand_object *internal_object,
  64                                   u8 * buffer, acpi_size * space_used);
  65
  66 static acpi_status
  67 acpi_ut_copy_esimple_to_isimple(union acpi_object *user_obj,
  68                                 union acpi_operand_object **return_obj);
  69
  70 static acpi_status
  71 acpi_ut_copy_epackage_to_ipackage(union acpi_object *external_object,
  72                                   union acpi_operand_object **internal_object);
  73
  74 static acpi_status
  75 acpi_ut_copy_simple_object(union acpi_operand_object *source_desc,
  76                            union acpi_operand_object *dest_desc);
  77
  78 static acpi_status
  79 acpi_ut_copy_ielement_to_eelement(u8 object_type,
  80                                   union acpi_operand_object *source_object,
  81                                   union acpi_generic_state *state,
  82                                   void *context);
  83
  84 static acpi_status
  85 acpi_ut_copy_ipackage_to_ipackage(union acpi_operand_object *source_obj,
  86                                   union acpi_operand_object *dest_obj,
  87                                   struct acpi_walk_state *walk_state);
  88
  89 /*******************************************************************************
  90  *
  91  * FUNCTION:    acpi_ut_copy_isimple_to_esimple
  92  *
  93  * PARAMETERS:  internal_object     - Source object to be copied
  94  *              external_object     - Where to return the copied object
  95  *              data_space          - Where object data is returned (such as
  96  *                                    buffer and string data)
  97  *              buffer_space_used   - Length of data_space that was used
  98  *
  99  * RETURN:      Status
 100  *
 101  * DESCRIPTION: This function is called to copy a simple internal object to
 102  *              an external object.
 103  *
 104  *              The data_space buffer is assumed to have sufficient space for
 105  *              the object.
 106  *
 107  ******************************************************************************/
 108
 109 static acpi_status
 110 acpi_ut_copy_isimple_to_esimple(union acpi_operand_object *internal_object,
 111                                 union acpi_object *external_object,
 112                                 u8 * data_space, acpi_size * buffer_space_used)
 113 {
 114         acpi_status status = AE_OK;
 115
 116         ACPI_FUNCTION_TRACE(ut_copy_isimple_to_esimple);
 117
 118         *buffer_space_used = 0;
 119
 120         /*
 121          * Check for NULL object case (could be an uninitialized
 122          * package element)
 123          */
 124         if (!internal_object) {
 125                 return_ACPI_STATUS(AE_OK);
 126         }
 127
 128         /* Always clear the external object */
 129
 130         ACPI_MEMSET(external_object, 0, sizeof(union acpi_object));
 131
 132         /*
 133          * In general, the external object will be the same type as
 134          * the internal object
 135          */
 136         external_object->type = ACPI_GET_OBJECT_TYPE(internal_object);
 137
 138         /* However, only a limited number of external types are supported */
 139
 140         switch (ACPI_GET_OBJECT_TYPE(internal_object)) {
 141         case ACPI_TYPE_STRING:
 142
 143                 external_object->string.pointer = (char *)data_space;
 144                 external_object->string.length = internal_object->string.length;
 145                 *buffer_space_used = ACPI_ROUND_UP_TO_NATIVE_WORD((acpi_size)
 146                                                                   internal_object->
 147                                                                   string.
 148                                                                   length + 1);
 149
 150                 ACPI_MEMCPY((void *)data_space,
 151                             (void *)internal_object->string.pointer,
 152                             (acpi_size) internal_object->string.length + 1);
 153                 break;
 154
 155         case ACPI_TYPE_BUFFER:
 156
 157                 external_object->buffer.pointer = data_space;
 158                 external_object->buffer.length = internal_object->buffer.length;
 159                 *buffer_space_used =
 160                     ACPI_ROUND_UP_TO_NATIVE_WORD(internal_object->string.
 161                                                  length);
 162
 163                 ACPI_MEMCPY((void *)data_space,
 164                             (void *)internal_object->buffer.pointer,
 165                             internal_object->buffer.length);
 166                 break;
 167
 168         case ACPI_TYPE_INTEGER:
 169
 170                 external_object->integer.value = internal_object->integer.value;
 171                 break;
 172
 173         case ACPI_TYPE_LOCAL_REFERENCE:
 174
 175                 /*
 176                  * This is an object reference.  Attempt to dereference it.
 177                  */
 178                 switch (internal_object->reference.opcode) {
 179                 case AML_INT_NAMEPATH_OP:
 180
 181                         /* For namepath, return the object handle ("reference") */
 182
 183                 default:
 184                         /*
 185                          * Use the object type of "Any" to indicate a reference
 186                          * to object containing a handle to an ACPI named object.
 187                          */
 188                         external_object->type = ACPI_TYPE_ANY;
 189                         external_object->reference.handle =
 190                             internal_object->reference.node;
 191                         break;
 192                 }
 193                 break;
 194
 195         case ACPI_TYPE_PROCESSOR:
 196
 197                 external_object->processor.proc_id =
 198                     internal_object->processor.proc_id;
 199                 external_object->processor.pblk_address =
 200                     internal_object->processor.address;
 201                 external_object->processor.pblk_length =
 202                     internal_object->processor.length;
 203                 break;
 204
 205         case ACPI_TYPE_POWER:
 206
 207                 external_object->power_resource.system_level =
 208                     internal_object->power_resource.system_level;
 209
 210                 external_object->power_resource.resource_order =
 211                     internal_object->power_resource.resource_order;
 212                 break;
 213
 214         default:
 215                 /*
 216                  * There is no corresponding external object type
 217                  */
 218                 return_ACPI_STATUS(AE_SUPPORT);
 219         }
 220
 221         return_ACPI_STATUS(status);
 222 }
 223
 224 /*******************************************************************************
 225  *
 226  * FUNCTION:    acpi_ut_copy_ielement_to_eelement
 227  *
 228  * PARAMETERS:  acpi_pkg_callback
 229  *
 230  * RETURN:      Status
 231  *
 232  * DESCRIPTION: Copy one package element to another package element
 233  *
 234  ******************************************************************************/
 235
 236 static acpi_status
 237 acpi_ut_copy_ielement_to_eelement(u8 object_type,
 238                                   union acpi_operand_object *source_object,
 239                                   union acpi_generic_state *state,
 240                                   void *context)
 241 {
 242         acpi_status status = AE_OK;
 243         struct acpi_pkg_info *info = (struct acpi_pkg_info *)context;
 244         acpi_size object_space;
 245         u32 this_index;
 246         union acpi_object *target_object;
 247
 248         ACPI_FUNCTION_ENTRY();
 249
 250         this_index = state->pkg.index;
 251         target_object = (union acpi_object *)
 252             &((union acpi_object *)(state->pkg.dest_object))->package.
 253             elements[this_index];
 254
 255         switch (object_type) {
 256         case ACPI_COPY_TYPE_SIMPLE:
 257
 258                 /*
 259                  * This is a simple or null object
 260                  */
 261                 status = acpi_ut_copy_isimple_to_esimple(source_object,
 262                                                          target_object,
 263                                                          info->free_space,
 264                                                          &object_space);
 265                 if (ACPI_FAILURE(status)) {
 266                         return (status);
 267                 }
 268                 break;
 269
 270         case ACPI_COPY_TYPE_PACKAGE:
 271
 272                 /*
 273                  * Build the package object
 274                  */
 275                 target_object->type = ACPI_TYPE_PACKAGE;
 276                 target_object->package.count = source_object->package.count;
 277                 target_object->package.elements =
 278                     ACPI_CAST_PTR(union acpi_object, info->free_space);
 279
 280                 /*
 281                  * Pass the new package object back to the package walk routine
 282                  */
 283                 state->pkg.this_target_obj = target_object;
 284
 285                 /*
 286                  * Save space for the array of objects (Package elements)
 287                  * update the buffer length counter
 288                  */
 289                 object_space = ACPI_ROUND_UP_TO_NATIVE_WORD((acpi_size)
 290                                                             target_object->
 291                                                             package.count *
 292                                                             sizeof(union
 293                                                                    acpi_object));
 294                 break;
 295
 296         default:
 297                 return (AE_BAD_PARAMETER);
 298         }
 299
 300         info->free_space += object_space;
 301         info->length += object_space;
 302         return (status);
 303 }
 304
 305 /*******************************************************************************
 306  *
 307  * FUNCTION:    acpi_ut_copy_ipackage_to_epackage
 308  *
 309  * PARAMETERS:  internal_object     - Pointer to the object we are returning
 310  *              Buffer              - Where the object is returned
 311  *              space_used          - Where the object length is returned
 312  *
 313  * RETURN:      Status
 314  *
 315  * DESCRIPTION: This function is called to place a package object in a user
 316  *              buffer.  A package object by definition contains other objects.
 317  *
 318  *              The buffer is assumed to have sufficient space for the object.
 319  *              The caller must have verified the buffer length needed using the
 320  *              acpi_ut_get_object_size function before calling this function.
 321  *
 322  ******************************************************************************/
 323
 324 static acpi_status
 325 acpi_ut_copy_ipackage_to_epackage(union acpi_operand_object *internal_object,
 326                                   u8 * buffer, acpi_size * space_used)
 327 {
 328         union acpi_object *external_object;
 329         acpi_status status;
 330         struct acpi_pkg_info info;
 331
 332         ACPI_FUNCTION_TRACE(ut_copy_ipackage_to_epackage);
 333
 334         /*
 335          * First package at head of the buffer
 336          */
 337         external_object = ACPI_CAST_PTR(union acpi_object, buffer);
 338
 339         /*
 340          * Free space begins right after the first package
 341          */
 342         info.length = ACPI_ROUND_UP_TO_NATIVE_WORD(sizeof(union acpi_object));
 343         info.free_space =
 344             buffer + ACPI_ROUND_UP_TO_NATIVE_WORD(sizeof(union acpi_object));
 345         info.object_space = 0;
 346         info.num_packages = 1;
 347
 348         external_object->type = ACPI_GET_OBJECT_TYPE(internal_object);
 349         external_object->package.count = internal_object->package.count;
 350         external_object->package.elements = ACPI_CAST_PTR(union acpi_object,
 351                                                           info.free_space);
 352
 353         /*
 354          * Leave room for an array of ACPI_OBJECTS in the buffer
 355          * and move the free space past it
 356          */
 357         info.length += (acpi_size) external_object->package.count *
 358             ACPI_ROUND_UP_TO_NATIVE_WORD(sizeof(union acpi_object));
 359         info.free_space += external_object->package.count *
 360             ACPI_ROUND_UP_TO_NATIVE_WORD(sizeof(union acpi_object));
 361
 362         status = acpi_ut_walk_package_tree(internal_object, external_object,
 363                                            acpi_ut_copy_ielement_to_eelement,
 364                                            &info);
 365
 366         *space_used = info.length;
 367         return_ACPI_STATUS(status);
 368 }
 369
 370 /*******************************************************************************
 371  *
 372  * FUNCTION:    acpi_ut_copy_iobject_to_eobject
 373  *
 374  * PARAMETERS:  internal_object     - The internal object to be converted
 375  *              buffer_ptr          - Where the object is returned
 376  *
 377  * RETURN:      Status
 378  *
 379  * DESCRIPTION: This function is called to build an API object to be returned to
 380  *              the caller.
 381  *
 382  ******************************************************************************/
 383
 384 acpi_status
 385 acpi_ut_copy_iobject_to_eobject(union acpi_operand_object *internal_object,
 386                                 struct acpi_buffer *ret_buffer)
 387 {
 388         acpi_status status;
 389
 390         ACPI_FUNCTION_TRACE(ut_copy_iobject_to_eobject);
 391
 392         if (ACPI_GET_OBJECT_TYPE(internal_object) == ACPI_TYPE_PACKAGE) {
 393                 /*
 394                  * Package object:  Copy all subobjects (including
 395                  * nested packages)
 396                  */
 397                 status = acpi_ut_copy_ipackage_to_epackage(internal_object,
 398                                                            ret_buffer->pointer,
 399                                                            &ret_buffer->length);
 400         } else {
 401                 /*
 402                  * Build a simple object (no nested objects)
 403                  */
 404                 status = acpi_ut_copy_isimple_to_esimple(internal_object,
 405                                                          ACPI_CAST_PTR(union
 406                                                                        acpi_object,
 407                                                                        ret_buffer->
 408                                                                        pointer),
 409                                                          ACPI_ADD_PTR(u8,
 410                                                                       ret_buffer->
 411                                                                       pointer,
 412                                                                       ACPI_ROUND_UP_TO_NATIVE_WORD
 413                                                                       (sizeof
 414                                                                        (union
 415                                                                         acpi_object))),
 416                                                          &ret_buffer->length);
 417                 /*
 418                  * build simple does not include the object size in the length
 419                  * so we add it in here
 420                  */
 421                 ret_buffer->length += sizeof(union acpi_object);
 422         }
 423
 424         return_ACPI_STATUS(status);
 425 }
 426
 427 /*******************************************************************************
 428  *
 429  * FUNCTION:    acpi_ut_copy_esimple_to_isimple
 430  *
 431  * PARAMETERS:  external_object     - The external object to be converted
 432  *              ret_internal_object - Where the internal object is returned
 433  *
 434  * RETURN:      Status
 435  *
 436  * DESCRIPTION: This function copies an external object to an internal one.
 437  *              NOTE: Pointers can be copied, we don't need to copy data.
 438  *              (The pointers have to be valid in our address space no matter
 439  *              what we do with them!)
 440  *
 441  ******************************************************************************/
 442
 443 static acpi_status
 444 acpi_ut_copy_esimple_to_isimple(union acpi_object *external_object,
 445                                 union acpi_operand_object **ret_internal_object)
 446 {
 447         union acpi_operand_object *internal_object;
 448
 449         ACPI_FUNCTION_TRACE(ut_copy_esimple_to_isimple);
 450
 451         /*
 452          * Simple types supported are: String, Buffer, Integer
 453          */
 454         switch (external_object->type) {
 455         case ACPI_TYPE_STRING:
 456         case ACPI_TYPE_BUFFER:
 457         case ACPI_TYPE_INTEGER:
 458
 459                 internal_object = acpi_ut_create_internal_object((u8)
 460                                                                  external_object->
 461                                                                  type);
 462                 if (!internal_object) {
 463                         return_ACPI_STATUS(AE_NO_MEMORY);
 464                 }
 465                 break;
 466
 467         default:
 468                 /* All other types are not supported */
 469
 470                 return_ACPI_STATUS(AE_SUPPORT);
 471         }
 472
 473         /* Must COPY string and buffer contents */
 474
 475         switch (external_object->type) {
 476         case ACPI_TYPE_STRING:
 477
 478                 internal_object->string.pointer =
 479                     ACPI_ALLOCATE_ZEROED((acpi_size) external_object->string.
 480                                          length + 1);
 481                 if (!internal_object->string.pointer) {
 482                         goto error_exit;
 483                 }
 484
 485                 ACPI_MEMCPY(internal_object->string.pointer,
 486                             external_object->string.pointer,
 487                             external_object->string.length);
 488
 489                 internal_object->string.length = external_object->string.length;
 490                 break;
 491
 492         case ACPI_TYPE_BUFFER:
 493
 494                 internal_object->buffer.pointer =
 495                     ACPI_ALLOCATE_ZEROED(external_object->buffer.length);
 496                 if (!internal_object->buffer.pointer) {
 497                         goto error_exit;
 498                 }
 499
 500                 ACPI_MEMCPY(internal_object->buffer.pointer,
 501                             external_object->buffer.pointer,
 502                             external_object->buffer.length);
 503
 504                 internal_object->buffer.length = external_object->buffer.length;
 505                 break;
 506
 507         case ACPI_TYPE_INTEGER:
 508
 509                 internal_object->integer.value = external_object->integer.value;
 510                 break;
 511
 512         default:
 513                 /* Other types can't get here */
 514                 break;
 515         }
 516
 517         *ret_internal_object = internal_object;
 518         return_ACPI_STATUS(AE_OK);
 519
 520       error_exit:
 521         acpi_ut_remove_reference(internal_object);
 522         return_ACPI_STATUS(AE_NO_MEMORY);
 523 }
 524
 525 /*******************************************************************************
 526  *
 527  * FUNCTION:    acpi_ut_copy_epackage_to_ipackage
 528  *
 529  * PARAMETERS:  external_object     - The external object to be converted
 530  *              internal_object     - Where the internal object is returned
 531  *
 532  * RETURN:      Status
 533  *
 534  * DESCRIPTION: Copy an external package object to an internal package.
 535  *              Handles nested packages.
 536  *
 537  ******************************************************************************/
 538
 539 static acpi_status
 540 acpi_ut_copy_epackage_to_ipackage(union acpi_object *external_object,
 541                                   union acpi_operand_object **internal_object)
 542 {
 543         acpi_status status = AE_OK;
 544         union acpi_operand_object *package_object;
 545         union acpi_operand_object **package_elements;
 546         acpi_native_uint i;
 547
 548         ACPI_FUNCTION_TRACE(ut_copy_epackage_to_ipackage);
 549
 550         /* Create the package object */
 551
 552         package_object =
 553             acpi_ut_create_package_object(external_object->package.count);
 554         if (!package_object) {
 555                 return_ACPI_STATUS(AE_NO_MEMORY);
 556         }
 557
 558         package_elements = package_object->package.elements;
 559
 560         /*
 561          * Recursive implementation. Probably ok, since nested external packages
 562          * as parameters should be very rare.
 563          */
 564         for (i = 0; i < external_object->package.count; i++) {
 565                 status =
 566                     acpi_ut_copy_eobject_to_iobject(&external_object->package.
 567                                                     elements[i],
 568                                                     &package_elements[i]);
 569                 if (ACPI_FAILURE(status)) {
 570
 571                         /* Truncate package and delete it */
 572
 573                         package_object->package.count = i;
 574                         package_elements[i] = NULL;
 575                         acpi_ut_remove_reference(package_object);
 576                         return_ACPI_STATUS(status);
 577                 }
 578         }
 579
 580         *internal_object = package_object;
 581         return_ACPI_STATUS(status);
 582 }
 583
 584 /*******************************************************************************
 585  *
 586  * FUNCTION:    acpi_ut_copy_eobject_to_iobject
 587  *
 588  * PARAMETERS:  external_object     - The external object to be converted
 589  *              internal_object     - Where the internal object is returned
 590  *
 591  * RETURN:      Status              - the status of the call
 592  *
 593  * DESCRIPTION: Converts an external object to an internal object.
 594  *
 595  ******************************************************************************/
 596
 597 acpi_status
 598 acpi_ut_copy_eobject_to_iobject(union acpi_object *external_object,
 599                                 union acpi_operand_object **internal_object)
 600 {
 601         acpi_status status;
 602
 603         ACPI_FUNCTION_TRACE(ut_copy_eobject_to_iobject);
 604
 605         if (external_object->type == ACPI_TYPE_PACKAGE) {
 606                 status =
 607                     acpi_ut_copy_epackage_to_ipackage(external_object,
 608                                                       internal_object);
 609         } else {
 610                 /*
 611                  * Build a simple object (no nested objects)
 612                  */
 613                 status =
 614                     acpi_ut_copy_esimple_to_isimple(external_object,
 615                                                     internal_object);
 616         }
 617
 618         return_ACPI_STATUS(status);
 619 }
 620
 621 /*******************************************************************************
 622  *
 623  * FUNCTION:    acpi_ut_copy_simple_object
 624  *
 625  * PARAMETERS:  source_desc         - The internal object to be copied
 626  *              dest_desc           - New target object
 627  *
 628  * RETURN:      Status
 629  *
 630  * DESCRIPTION: Simple copy of one internal object to another.  Reference count
 631  *              of the destination object is preserved.
 632  *
 633  ******************************************************************************/
 634
 635 static acpi_status
 636 acpi_ut_copy_simple_object(union acpi_operand_object *source_desc,
 637                            union acpi_operand_object *dest_desc)
 638 {
 639         u16 reference_count;
 640         union acpi_operand_object *next_object;
 641
 642         /* Save fields from destination that we don't want to overwrite */
 643
 644         reference_count = dest_desc->common.reference_count;
 645         next_object = dest_desc->common.next_object;
 646
 647         /* Copy the entire source object over the destination object */
 648
 649         ACPI_MEMCPY((char *)dest_desc, (char *)source_desc,
 650                     sizeof(union acpi_operand_object));
 651
 652         /* Restore the saved fields */
 653
 654         dest_desc->common.reference_count = reference_count;
 655         dest_desc->common.next_object = next_object;
 656
 657         /* New object is not static, regardless of source */
 658
 659         dest_desc->common.flags &= ~AOPOBJ_STATIC_POINTER;
 660
 661         /* Handle the objects with extra data */
 662
 663         switch (ACPI_GET_OBJECT_TYPE(dest_desc)) {
 664         case ACPI_TYPE_BUFFER:
 665                 /*
 666                  * Allocate and copy the actual buffer if and only if:
 667                  * 1) There is a valid buffer pointer
 668                  * 2) The buffer has a length > 0
 669                  */
 670                 if ((source_desc->buffer.pointer) &&
 671                     (source_desc->buffer.length)) {
 672                         dest_desc->buffer.pointer =
 673                             ACPI_ALLOCATE(source_desc->buffer.length);
 674                         if (!dest_desc->buffer.pointer) {
 675                                 return (AE_NO_MEMORY);
 676                         }
 677
 678                         /* Copy the actual buffer data */
 679
 680                         ACPI_MEMCPY(dest_desc->buffer.pointer,
 681                                     source_desc->buffer.pointer,
 682                                     source_desc->buffer.length);
 683                 }
 684                 break;
 685
 686         case ACPI_TYPE_STRING:
 687                 /*
 688                  * Allocate and copy the actual string if and only if:
 689                  * 1) There is a valid string pointer
 690                  * (Pointer to a NULL string is allowed)
 691                  */
 692                 if (source_desc->string.pointer) {
 693                         dest_desc->string.pointer =
 694                             ACPI_ALLOCATE((acpi_size) source_desc->string.
 695                                           length + 1);
 696                         if (!dest_desc->string.pointer) {
 697                                 return (AE_NO_MEMORY);
 698                         }
 699
 700                         /* Copy the actual string data */
 701
 702                         ACPI_MEMCPY(dest_desc->string.pointer,
 703                                     source_desc->string.pointer,
 704                                     (acpi_size) source_desc->string.length + 1);
 705                 }
 706                 break;
 707
 708         case ACPI_TYPE_LOCAL_REFERENCE:
 709                 /*
 710                  * We copied the reference object, so we now must add a reference
 711                  * to the object pointed to by the reference
 712                  */
 713                 acpi_ut_add_reference(source_desc->reference.object);
 714                 break;
 715
 716         case ACPI_TYPE_REGION:
 717                 /*
 718                  * We copied the Region Handler, so we now must add a reference
 719                  */
 720                 if (dest_desc->region.handler) {
 721                         acpi_ut_add_reference(dest_desc->region.handler);
 722                 }
 723                 break;
 724
 725         default:
 726                 /* Nothing to do for other simple objects */
 727                 break;
 728         }
 729
 730         return (AE_OK);
 731 }
 732
 733 /*******************************************************************************
 734  *
 735  * FUNCTION:    acpi_ut_copy_ielement_to_ielement
 736  *
 737  * PARAMETERS:  acpi_pkg_callback
 738  *
 739  * RETURN:      Status
 740  *
 741  * DESCRIPTION: Copy one package element to another package element
 742  *
 743  ******************************************************************************/
 744
 745 static acpi_status
 746 acpi_ut_copy_ielement_to_ielement(u8 object_type,
 747                                   union acpi_operand_object *source_object,
 748                                   union acpi_generic_state *state,
 749                                   void *context)
 750 {
 751         acpi_status status = AE_OK;
 752         u32 this_index;
 753         union acpi_operand_object **this_target_ptr;
 754         union acpi_operand_object *target_object;
 755
 756         ACPI_FUNCTION_ENTRY();
 757
 758         this_index = state->pkg.index;
 759         this_target_ptr = (union acpi_operand_object **)
 760             &state->pkg.dest_object->package.elements[this_index];
 761
 762         switch (object_type) {
 763         case ACPI_COPY_TYPE_SIMPLE:
 764
 765                 /* A null source object indicates a (legal) null package element */
 766
 767                 if (source_object) {
 768                         /*
 769                          * This is a simple object, just copy it
 770                          */
 771                         target_object =
 772                             acpi_ut_create_internal_object(ACPI_GET_OBJECT_TYPE
 773                                                            (source_object));
 774                         if (!target_object) {
 775                                 return (AE_NO_MEMORY);
 776                         }
 777
 778                         status =
 779                             acpi_ut_copy_simple_object(source_object,
 780                                                        target_object);
 781                         if (ACPI_FAILURE(status)) {
 782                                 goto error_exit;
 783                         }
 784
 785                         *this_target_ptr = target_object;
 786                 } else {
 787                         /* Pass through a null element */
 788
 789                         *this_target_ptr = NULL;
 790                 }
 791                 break;
 792
 793         case ACPI_COPY_TYPE_PACKAGE:
 794
 795                 /*
 796                  * This object is a package - go down another nesting level
 797                  * Create and build the package object
 798                  */
 799                 target_object =
 800                     acpi_ut_create_package_object(source_object->package.count);
 801                 if (!target_object) {
 802                         return (AE_NO_MEMORY);
 803                 }
 804
 805                 target_object->common.flags = source_object->common.flags;
 806
 807                 /* Pass the new package object back to the package walk routine */
 808
 809                 state->pkg.this_target_obj = target_object;
 810
 811                 /* Store the object pointer in the parent package object */
 812
 813                 *this_target_ptr = target_object;
 814                 break;
 815
 816         default:
 817                 return (AE_BAD_PARAMETER);
 818         }
 819
 820         return (status);
 821
 822       error_exit:
 823         acpi_ut_remove_reference(target_object);
 824         return (status);
 825 }
 826
 827 /*******************************************************************************
 828  *
 829  * FUNCTION:    acpi_ut_copy_ipackage_to_ipackage
 830  *
 831  * PARAMETERS:  *source_obj     - Pointer to the source package object
 832  *              *dest_obj       - Where the internal object is returned
 833  *
 834  * RETURN:      Status          - the status of the call
 835  *
 836  * DESCRIPTION: This function is called to copy an internal package object
 837  *              into another internal package object.
 838  *
 839  ******************************************************************************/
 840
 841 static acpi_status
 842 acpi_ut_copy_ipackage_to_ipackage(union acpi_operand_object *source_obj,
 843                                   union acpi_operand_object *dest_obj,
 844                                   struct acpi_walk_state *walk_state)
 845 {
 846         acpi_status status = AE_OK;
 847
 848         ACPI_FUNCTION_TRACE(ut_copy_ipackage_to_ipackage);
 849
 850         dest_obj->common.type = ACPI_GET_OBJECT_TYPE(source_obj);
 851         dest_obj->common.flags = source_obj->common.flags;
 852         dest_obj->package.count = source_obj->package.count;
 853
 854         /*
 855          * Create the object array and walk the source package tree
 856          */
 857         dest_obj->package.elements = ACPI_ALLOCATE_ZEROED(((acpi_size)
 858                                                            source_obj->package.
 859                                                            count +
 860                                                            1) * sizeof(void *));
 861         if (!dest_obj->package.elements) {
 862                 ACPI_ERROR((AE_INFO, "Package allocation failure"));
 863                 return_ACPI_STATUS(AE_NO_MEMORY);
 864         }
 865
 866         /*
 867          * Copy the package element-by-element by walking the package "tree".
 868          * This handles nested packages of arbitrary depth.
 869          */
 870         status = acpi_ut_walk_package_tree(source_obj, dest_obj,
 871                                            acpi_ut_copy_ielement_to_ielement,
 872                                            walk_state);
 873         if (ACPI_FAILURE(status)) {
 874
 875                 /* On failure, delete the destination package object */
 876
 877                 acpi_ut_remove_reference(dest_obj);
 878         }
 879
 880         return_ACPI_STATUS(status);
 881 }
 882
 883 /*******************************************************************************
 884  *
 885  * FUNCTION:    acpi_ut_copy_iobject_to_iobject
 886  *
 887  * PARAMETERS:  walk_state          - Current walk state
 888  *              source_desc         - The internal object to be copied
 889  *              dest_desc           - Where the copied object is returned
 890  *
 891  * RETURN:      Status
 892  *
 893  * DESCRIPTION: Copy an internal object to a new internal object
 894  *
 895  ******************************************************************************/
 896
 897 acpi_status
 898 acpi_ut_copy_iobject_to_iobject(union acpi_operand_object *source_desc,
 899                                 union acpi_operand_object **dest_desc,
 900                                 struct acpi_walk_state *walk_state)
 901 {
 902         acpi_status status = AE_OK;
 903
 904         ACPI_FUNCTION_TRACE(ut_copy_iobject_to_iobject);
 905
 906         /* Create the top level object */
 907
 908         *dest_desc =
 909             acpi_ut_create_internal_object(ACPI_GET_OBJECT_TYPE(source_desc));
 910         if (!*dest_desc) {
 911                 return_ACPI_STATUS(AE_NO_MEMORY);
 912         }
 913
 914         /* Copy the object and possible subobjects */
 915
 916         if (ACPI_GET_OBJECT_TYPE(source_desc) == ACPI_TYPE_PACKAGE) {
 917                 status =
 918                     acpi_ut_copy_ipackage_to_ipackage(source_desc, *dest_desc,
 919                                                       walk_state);
 920         } else {
 921                 status = acpi_ut_copy_simple_object(source_desc, *dest_desc);
 922         }
 923
 924         return_ACPI_STATUS(status);
 925 }