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 - 2006, 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_simple_object(union acpi_operand_object *source_desc,
  72                            union acpi_operand_object *dest_desc);
  73
  74 static acpi_status
  75 acpi_ut_copy_ielement_to_eelement(u8 object_type,
  76                                   union acpi_operand_object *source_object,
  77                                   union acpi_generic_state *state,
  78                                   void *context);
  79
  80 static acpi_status
  81 acpi_ut_copy_ipackage_to_ipackage(union acpi_operand_object *source_obj,
  82                                   union acpi_operand_object *dest_obj,
  83                                   struct acpi_walk_state *walk_state);
  84
  85 /*******************************************************************************
  86  *
  87  * FUNCTION:    acpi_ut_copy_isimple_to_esimple
  88  *
  89  * PARAMETERS:  internal_object     - Source object to be copied
  90  *              external_object     - Where to return the copied object
  91  *              data_space          - Where object data is returned (such as
  92  *                                    buffer and string data)
  93  *              buffer_space_used   - Length of data_space that was used
  94  *
  95  * RETURN:      Status
  96  *
  97  * DESCRIPTION: This function is called to copy a simple internal object to
  98  *              an external object.
  99  *
 100  *              The data_space buffer is assumed to have sufficient space for
 101  *              the object.
 102  *
 103  ******************************************************************************/
 104
 105 static acpi_status
 106 acpi_ut_copy_isimple_to_esimple(union acpi_operand_object *internal_object,
 107                                 union acpi_object *external_object,
 108                                 u8 * data_space, acpi_size * buffer_space_used)
 109 {
 110         acpi_status status = AE_OK;
 111
 112         ACPI_FUNCTION_TRACE(ut_copy_isimple_to_esimple);
 113
 114         *buffer_space_used = 0;
 115
 116         /*
 117          * Check for NULL object case (could be an uninitialized
 118          * package element)
 119          */
 120         if (!internal_object) {
 121                 return_ACPI_STATUS(AE_OK);
 122         }
 123
 124         /* Always clear the external object */
 125
 126         ACPI_MEMSET(external_object, 0, sizeof(union acpi_object));
 127
 128         /*
 129          * In general, the external object will be the same type as
 130          * the internal object
 131          */
 132         external_object->type = ACPI_GET_OBJECT_TYPE(internal_object);
 133
 134         /* However, only a limited number of external types are supported */
 135
 136         switch (ACPI_GET_OBJECT_TYPE(internal_object)) {
 137         case ACPI_TYPE_STRING:
 138
 139                 external_object->string.pointer = (char *)data_space;
 140                 external_object->string.length = internal_object->string.length;
 141                 *buffer_space_used = ACPI_ROUND_UP_TO_NATIVE_WORD((acpi_size)
 142                                                                   internal_object->
 143                                                                   string.
 144                                                                   length + 1);
 145
 146                 ACPI_MEMCPY((void *)data_space,
 147                             (void *)internal_object->string.pointer,
 148                             (acpi_size) internal_object->string.length + 1);
 149                 break;
 150
 151         case ACPI_TYPE_BUFFER:
 152
 153                 external_object->buffer.pointer = data_space;
 154                 external_object->buffer.length = internal_object->buffer.length;
 155                 *buffer_space_used =
 156                     ACPI_ROUND_UP_TO_NATIVE_WORD(internal_object->string.
 157                                                  length);
 158
 159                 ACPI_MEMCPY((void *)data_space,
 160                             (void *)internal_object->buffer.pointer,
 161                             internal_object->buffer.length);
 162                 break;
 163
 164         case ACPI_TYPE_INTEGER:
 165
 166                 external_object->integer.value = internal_object->integer.value;
 167                 break;
 168
 169         case ACPI_TYPE_LOCAL_REFERENCE:
 170
 171                 /*
 172                  * This is an object reference.  Attempt to dereference it.
 173                  */
 174                 switch (internal_object->reference.opcode) {
 175                 case AML_INT_NAMEPATH_OP:
 176
 177                         /* For namepath, return the object handle ("reference") */
 178
 179                 default:
 180                         /*
 181                          * Use the object type of "Any" to indicate a reference
 182                          * to object containing a handle to an ACPI named object.
 183                          */
 184                         external_object->type = ACPI_TYPE_ANY;
 185                         external_object->reference.handle =
 186                             internal_object->reference.node;
 187                         break;
 188                 }
 189                 break;
 190
 191         case ACPI_TYPE_PROCESSOR:
 192
 193                 external_object->processor.proc_id =
 194                     internal_object->processor.proc_id;
 195                 external_object->processor.pblk_address =
 196                     internal_object->processor.address;
 197                 external_object->processor.pblk_length =
 198                     internal_object->processor.length;
 199                 break;
 200
 201         case ACPI_TYPE_POWER:
 202
 203                 external_object->power_resource.system_level =
 204                     internal_object->power_resource.system_level;
 205
 206                 external_object->power_resource.resource_order =
 207                     internal_object->power_resource.resource_order;
 208                 break;
 209
 210         default:
 211                 /*
 212                  * There is no corresponding external object type
 213                  */
 214                 return_ACPI_STATUS(AE_SUPPORT);
 215         }
 216
 217         return_ACPI_STATUS(status);
 218 }
 219
 220 /*******************************************************************************
 221  *
 222  * FUNCTION:    acpi_ut_copy_ielement_to_eelement
 223  *
 224  * PARAMETERS:  acpi_pkg_callback
 225  *
 226  * RETURN:      Status
 227  *
 228  * DESCRIPTION: Copy one package element to another package element
 229  *
 230  ******************************************************************************/
 231
 232 static acpi_status
 233 acpi_ut_copy_ielement_to_eelement(u8 object_type,
 234                                   union acpi_operand_object *source_object,
 235                                   union acpi_generic_state *state,
 236                                   void *context)
 237 {
 238         acpi_status status = AE_OK;
 239         struct acpi_pkg_info *info = (struct acpi_pkg_info *)context;
 240         acpi_size object_space;
 241         u32 this_index;
 242         union acpi_object *target_object;
 243
 244         ACPI_FUNCTION_ENTRY();
 245
 246         this_index = state->pkg.index;
 247         target_object = (union acpi_object *)
 248             &((union acpi_object *)(state->pkg.dest_object))->package.
 249             elements[this_index];
 250
 251         switch (object_type) {
 252         case ACPI_COPY_TYPE_SIMPLE:
 253
 254                 /*
 255                  * This is a simple or null object
 256                  */
 257                 status = acpi_ut_copy_isimple_to_esimple(source_object,
 258                                                          target_object,
 259                                                          info->free_space,
 260                                                          &object_space);
 261                 if (ACPI_FAILURE(status)) {
 262                         return (status);
 263                 }
 264                 break;
 265
 266         case ACPI_COPY_TYPE_PACKAGE:
 267
 268                 /*
 269                  * Build the package object
 270                  */
 271                 target_object->type = ACPI_TYPE_PACKAGE;
 272                 target_object->package.count = source_object->package.count;
 273                 target_object->package.elements =
 274                     ACPI_CAST_PTR(union acpi_object, info->free_space);
 275
 276                 /*
 277                  * Pass the new package object back to the package walk routine
 278                  */
 279                 state->pkg.this_target_obj = target_object;
 280
 281                 /*
 282                  * Save space for the array of objects (Package elements)
 283                  * update the buffer length counter
 284                  */
 285                 object_space = ACPI_ROUND_UP_TO_NATIVE_WORD((acpi_size)
 286                                                             target_object->
 287                                                             package.count *
 288                                                             sizeof(union
 289                                                                    acpi_object));
 290                 break;
 291
 292         default:
 293                 return (AE_BAD_PARAMETER);
 294         }
 295
 296         info->free_space += object_space;
 297         info->length += object_space;
 298         return (status);
 299 }
 300
 301 /*******************************************************************************
 302  *
 303  * FUNCTION:    acpi_ut_copy_ipackage_to_epackage
 304  *
 305  * PARAMETERS:  internal_object     - Pointer to the object we are returning
 306  *              Buffer              - Where the object is returned
 307  *              space_used          - Where the object length is returned
 308  *
 309  * RETURN:      Status
 310  *
 311  * DESCRIPTION: This function is called to place a package object in a user
 312  *              buffer.  A package object by definition contains other objects.
 313  *
 314  *              The buffer is assumed to have sufficient space for the object.
 315  *              The caller must have verified the buffer length needed using the
 316  *              acpi_ut_get_object_size function before calling this function.
 317  *
 318  ******************************************************************************/
 319
 320 static acpi_status
 321 acpi_ut_copy_ipackage_to_epackage(union acpi_operand_object *internal_object,
 322                                   u8 * buffer, acpi_size * space_used)
 323 {
 324         union acpi_object *external_object;
 325         acpi_status status;
 326         struct acpi_pkg_info info;
 327
 328         ACPI_FUNCTION_TRACE(ut_copy_ipackage_to_epackage);
 329
 330         /*
 331          * First package at head of the buffer
 332          */
 333         external_object = ACPI_CAST_PTR(union acpi_object, buffer);
 334
 335         /*
 336          * Free space begins right after the first package
 337          */
 338         info.length = ACPI_ROUND_UP_TO_NATIVE_WORD(sizeof(union acpi_object));
 339         info.free_space =
 340             buffer + ACPI_ROUND_UP_TO_NATIVE_WORD(sizeof(union acpi_object));
 341         info.object_space = 0;
 342         info.num_packages = 1;
 343
 344         external_object->type = ACPI_GET_OBJECT_TYPE(internal_object);
 345         external_object->package.count = internal_object->package.count;
 346         external_object->package.elements = ACPI_CAST_PTR(union acpi_object,
 347                                                           info.free_space);
 348
 349         /*
 350          * Leave room for an array of ACPI_OBJECTS in the buffer
 351          * and move the free space past it
 352          */
 353         info.length += (acpi_size) external_object->package.count *
 354             ACPI_ROUND_UP_TO_NATIVE_WORD(sizeof(union acpi_object));
 355         info.free_space += external_object->package.count *
 356             ACPI_ROUND_UP_TO_NATIVE_WORD(sizeof(union acpi_object));
 357
 358         status = acpi_ut_walk_package_tree(internal_object, external_object,
 359                                            acpi_ut_copy_ielement_to_eelement,
 360                                            &info);
 361
 362         *space_used = info.length;
 363         return_ACPI_STATUS(status);
 364 }
 365
 366 /*******************************************************************************
 367  *
 368  * FUNCTION:    acpi_ut_copy_iobject_to_eobject
 369  *
 370  * PARAMETERS:  internal_object     - The internal object to be converted
 371  *              buffer_ptr          - Where the object is returned
 372  *
 373  * RETURN:      Status
 374  *
 375  * DESCRIPTION: This function is called to build an API object to be returned to
 376  *              the caller.
 377  *
 378  ******************************************************************************/
 379
 380 acpi_status
 381 acpi_ut_copy_iobject_to_eobject(union acpi_operand_object *internal_object,
 382                                 struct acpi_buffer *ret_buffer)
 383 {
 384         acpi_status status;
 385
 386         ACPI_FUNCTION_TRACE(ut_copy_iobject_to_eobject);
 387
 388         if (ACPI_GET_OBJECT_TYPE(internal_object) == ACPI_TYPE_PACKAGE) {
 389                 /*
 390                  * Package object:  Copy all subobjects (including
 391                  * nested packages)
 392                  */
 393                 status = acpi_ut_copy_ipackage_to_epackage(internal_object,
 394                                                            ret_buffer->pointer,
 395                                                            &ret_buffer->length);
 396         } else {
 397                 /*
 398                  * Build a simple object (no nested objects)
 399                  */
 400                 status = acpi_ut_copy_isimple_to_esimple(internal_object,
 401                                                          ACPI_CAST_PTR(union
 402                                                                        acpi_object,
 403                                                                        ret_buffer->
 404                                                                        pointer),
 405                                                          ACPI_ADD_PTR(u8,
 406                                                                       ret_buffer->
 407                                                                       pointer,
 408                                                                       ACPI_ROUND_UP_TO_NATIVE_WORD
 409                                                                       (sizeof
 410                                                                        (union
 411                                                                         acpi_object))),
 412                                                          &ret_buffer->length);
 413                 /*
 414                  * build simple does not include the object size in the length
 415                  * so we add it in here
 416                  */
 417                 ret_buffer->length += sizeof(union acpi_object);
 418         }
 419
 420         return_ACPI_STATUS(status);
 421 }
 422
 423 /*******************************************************************************
 424  *
 425  * FUNCTION:    acpi_ut_copy_esimple_to_isimple
 426  *
 427  * PARAMETERS:  external_object     - The external object to be converted
 428  *              ret_internal_object - Where the internal object is returned
 429  *
 430  * RETURN:      Status
 431  *
 432  * DESCRIPTION: This function copies an external object to an internal one.
 433  *              NOTE: Pointers can be copied, we don't need to copy data.
 434  *              (The pointers have to be valid in our address space no matter
 435  *              what we do with them!)
 436  *
 437  ******************************************************************************/
 438
 439 static acpi_status
 440 acpi_ut_copy_esimple_to_isimple(union acpi_object *external_object,
 441                                 union acpi_operand_object **ret_internal_object)
 442 {
 443         union acpi_operand_object *internal_object;
 444
 445         ACPI_FUNCTION_TRACE(ut_copy_esimple_to_isimple);
 446
 447         /*
 448          * Simple types supported are: String, Buffer, Integer
 449          */
 450         switch (external_object->type) {
 451         case ACPI_TYPE_STRING:
 452         case ACPI_TYPE_BUFFER:
 453         case ACPI_TYPE_INTEGER:
 454
 455                 internal_object = acpi_ut_create_internal_object((u8)
 456                                                                  external_object->
 457                                                                  type);
 458                 if (!internal_object) {
 459                         return_ACPI_STATUS(AE_NO_MEMORY);
 460                 }
 461                 break;
 462
 463         default:
 464                 /* All other types are not supported */
 465
 466                 return_ACPI_STATUS(AE_SUPPORT);
 467         }
 468
 469         /* Must COPY string and buffer contents */
 470
 471         switch (external_object->type) {
 472         case ACPI_TYPE_STRING:
 473
 474                 internal_object->string.pointer =
 475                     ACPI_ALLOCATE_ZEROED((acpi_size) external_object->string.
 476                                          length + 1);
 477                 if (!internal_object->string.pointer) {
 478                         goto error_exit;
 479                 }
 480
 481                 ACPI_MEMCPY(internal_object->string.pointer,
 482                             external_object->string.pointer,
 483                             external_object->string.length);
 484
 485                 internal_object->string.length = external_object->string.length;
 486                 break;
 487
 488         case ACPI_TYPE_BUFFER:
 489
 490                 internal_object->buffer.pointer =
 491                     ACPI_ALLOCATE_ZEROED(external_object->buffer.length);
 492                 if (!internal_object->buffer.pointer) {
 493                         goto error_exit;
 494                 }
 495
 496                 ACPI_MEMCPY(internal_object->buffer.pointer,
 497                             external_object->buffer.pointer,
 498                             external_object->buffer.length);
 499
 500                 internal_object->buffer.length = external_object->buffer.length;
 501                 break;
 502
 503         case ACPI_TYPE_INTEGER:
 504
 505                 internal_object->integer.value = external_object->integer.value;
 506                 break;
 507
 508         default:
 509                 /* Other types can't get here */
 510                 break;
 511         }
 512
 513         *ret_internal_object = internal_object;
 514         return_ACPI_STATUS(AE_OK);
 515
 516       error_exit:
 517         acpi_ut_remove_reference(internal_object);
 518         return_ACPI_STATUS(AE_NO_MEMORY);
 519 }
 520
 521 #ifdef ACPI_FUTURE_IMPLEMENTATION
 522 /* Code to convert packages that are parameters to control methods */
 523
 524 /*******************************************************************************
 525  *
 526  * FUNCTION:    acpi_ut_copy_epackage_to_ipackage
 527  *
 528  * PARAMETERS:  *internal_object   - Pointer to the object we are returning
 529  *              *Buffer            - Where the object is returned
 530  *              *space_used        - Where the length of the object is returned
 531  *
 532  * RETURN:      Status
 533  *
 534  * DESCRIPTION: This function is called to place a package object in a user
 535  *              buffer.  A package object by definition contains other objects.
 536  *
 537  *              The buffer is assumed to have sufficient space for the object.
 538  *              The caller must have verified the buffer length needed using the
 539  *              acpi_ut_get_object_size function before calling this function.
 540  *
 541  ******************************************************************************/
 542
 543 static acpi_status
 544 acpi_ut_copy_epackage_to_ipackage(union acpi_operand_object *internal_object,
 545                                   u8 * buffer, u32 * space_used)
 546 {
 547         u8 *free_space;
 548         union acpi_object *external_object;
 549         u32 length = 0;
 550         u32 this_index;
 551         u32 object_space = 0;
 552         union acpi_operand_object *this_internal_obj;
 553         union acpi_object *this_external_obj;
 554
 555         ACPI_FUNCTION_TRACE(ut_copy_epackage_to_ipackage);
 556
 557         /*
 558          * First package at head of the buffer
 559          */
 560         external_object = (union acpi_object *)buffer;
 561
 562         /*
 563          * Free space begins right after the first package
 564          */
 565         free_space = buffer + sizeof(union acpi_object);
 566
 567         external_object->type = ACPI_GET_OBJECT_TYPE(internal_object);
 568         external_object->package.count = internal_object->package.count;
 569         external_object->package.elements = (union acpi_object *)free_space;
 570
 571         /*
 572          * Build an array of ACPI_OBJECTS in the buffer
 573          * and move the free space past it
 574          */
 575         free_space +=
 576             external_object->package.count * sizeof(union acpi_object);
 577
 578         /* Call walk_package */
 579
 580 }
 581
 582 #endif                          /* Future implementation */
 583
 584 /*******************************************************************************
 585  *
 586  * FUNCTION:    acpi_ut_copy_eobject_to_iobject
 587  *
 588  * PARAMETERS:  *internal_object   - The external object to be converted
 589  *              *buffer_ptr     - 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                 /*
 607                  * Packages as external input to control methods are not supported,
 608                  */
 609                 ACPI_ERROR((AE_INFO,
 610                             "Packages as parameters not implemented!"));
 611
 612                 return_ACPI_STATUS(AE_NOT_IMPLEMENTED);
 613         }
 614
 615         else {
 616                 /*
 617                  * Build a simple object (no nested objects)
 618                  */
 619                 status =
 620                     acpi_ut_copy_esimple_to_isimple(external_object,
 621                                                     internal_object);
 622         }
 623
 624         return_ACPI_STATUS(status);
 625 }
 626
 627 /*******************************************************************************
 628  *
 629  * FUNCTION:    acpi_ut_copy_simple_object
 630  *
 631  * PARAMETERS:  source_desc         - The internal object to be copied
 632  *              dest_desc           - New target object
 633  *
 634  * RETURN:      Status
 635  *
 636  * DESCRIPTION: Simple copy of one internal object to another.  Reference count
 637  *              of the destination object is preserved.
 638  *
 639  ******************************************************************************/
 640
 641 static acpi_status
 642 acpi_ut_copy_simple_object(union acpi_operand_object *source_desc,
 643                            union acpi_operand_object *dest_desc)
 644 {
 645         u16 reference_count;
 646         union acpi_operand_object *next_object;
 647
 648         /* Save fields from destination that we don't want to overwrite */
 649
 650         reference_count = dest_desc->common.reference_count;
 651         next_object = dest_desc->common.next_object;
 652
 653         /* Copy the entire source object over the destination object */
 654
 655         ACPI_MEMCPY((char *)dest_desc, (char *)source_desc,
 656                     sizeof(union acpi_operand_object));
 657
 658         /* Restore the saved fields */
 659
 660         dest_desc->common.reference_count = reference_count;
 661         dest_desc->common.next_object = next_object;
 662
 663         /* New object is not static, regardless of source */
 664
 665         dest_desc->common.flags &= ~AOPOBJ_STATIC_POINTER;
 666
 667         /* Handle the objects with extra data */
 668
 669         switch (ACPI_GET_OBJECT_TYPE(dest_desc)) {
 670         case ACPI_TYPE_BUFFER:
 671                 /*
 672                  * Allocate and copy the actual buffer if and only if:
 673                  * 1) There is a valid buffer pointer
 674                  * 2) The buffer has a length > 0
 675                  */
 676                 if ((source_desc->buffer.pointer) &&
 677                     (source_desc->buffer.length)) {
 678                         dest_desc->buffer.pointer =
 679                             ACPI_ALLOCATE(source_desc->buffer.length);
 680                         if (!dest_desc->buffer.pointer) {
 681                                 return (AE_NO_MEMORY);
 682                         }
 683
 684                         /* Copy the actual buffer data */
 685
 686                         ACPI_MEMCPY(dest_desc->buffer.pointer,
 687                                     source_desc->buffer.pointer,
 688                                     source_desc->buffer.length);
 689                 }
 690                 break;
 691
 692         case ACPI_TYPE_STRING:
 693                 /*
 694                  * Allocate and copy the actual string if and only if:
 695                  * 1) There is a valid string pointer
 696                  * (Pointer to a NULL string is allowed)
 697                  */
 698                 if (source_desc->string.pointer) {
 699                         dest_desc->string.pointer =
 700                             ACPI_ALLOCATE((acpi_size) source_desc->string.
 701                                           length + 1);
 702                         if (!dest_desc->string.pointer) {
 703                                 return (AE_NO_MEMORY);
 704                         }
 705
 706                         /* Copy the actual string data */
 707
 708                         ACPI_MEMCPY(dest_desc->string.pointer,
 709                                     source_desc->string.pointer,
 710                                     (acpi_size) source_desc->string.length + 1);
 711                 }
 712                 break;
 713
 714         case ACPI_TYPE_LOCAL_REFERENCE:
 715                 /*
 716                  * We copied the reference object, so we now must add a reference
 717                  * to the object pointed to by the reference
 718                  */
 719                 acpi_ut_add_reference(source_desc->reference.object);
 720                 break;
 721
 722         default:
 723                 /* Nothing to do for other simple objects */
 724                 break;
 725         }
 726
 727         return (AE_OK);
 728 }
 729
 730 /*******************************************************************************
 731  *
 732  * FUNCTION:    acpi_ut_copy_ielement_to_ielement
 733  *
 734  * PARAMETERS:  acpi_pkg_callback
 735  *
 736  * RETURN:      Status
 737  *
 738  * DESCRIPTION: Copy one package element to another package element
 739  *
 740  ******************************************************************************/
 741
 742 static acpi_status
 743 acpi_ut_copy_ielement_to_ielement(u8 object_type,
 744                                   union acpi_operand_object *source_object,
 745                                   union acpi_generic_state *state,
 746                                   void *context)
 747 {
 748         acpi_status status = AE_OK;
 749         u32 this_index;
 750         union acpi_operand_object **this_target_ptr;
 751         union acpi_operand_object *target_object;
 752
 753         ACPI_FUNCTION_ENTRY();
 754
 755         this_index = state->pkg.index;
 756         this_target_ptr = (union acpi_operand_object **)
 757             &state->pkg.dest_object->package.elements[this_index];
 758
 759         switch (object_type) {
 760         case ACPI_COPY_TYPE_SIMPLE:
 761
 762                 /* A null source object indicates a (legal) null package element */
 763
 764                 if (source_object) {
 765                         /*
 766                          * This is a simple object, just copy it
 767                          */
 768                         target_object =
 769                             acpi_ut_create_internal_object(ACPI_GET_OBJECT_TYPE
 770                                                            (source_object));
 771                         if (!target_object) {
 772                                 return (AE_NO_MEMORY);
 773                         }
 774
 775                         status =
 776                             acpi_ut_copy_simple_object(source_object,
 777                                                        target_object);
 778                         if (ACPI_FAILURE(status)) {
 779                                 goto error_exit;
 780                         }
 781
 782                         *this_target_ptr = target_object;
 783                 } else {
 784                         /* Pass through a null element */
 785
 786                         *this_target_ptr = NULL;
 787                 }
 788                 break;
 789
 790         case ACPI_COPY_TYPE_PACKAGE:
 791
 792                 /*
 793                  * This object is a package - go down another nesting level
 794                  * Create and build the package object
 795                  */
 796                 target_object =
 797                     acpi_ut_create_internal_object(ACPI_TYPE_PACKAGE);
 798                 if (!target_object) {
 799                         return (AE_NO_MEMORY);
 800                 }
 801
 802                 target_object->package.count = source_object->package.count;
 803                 target_object->common.flags = source_object->common.flags;
 804
 805                 /*
 806                  * Create the object array
 807                  */
 808                 target_object->package.elements = ACPI_ALLOCATE_ZEROED(((acpi_size) source_object->package.count + 1) * sizeof(void *));
 809                 if (!target_object->package.elements) {
 810                         status = AE_NO_MEMORY;
 811                         goto error_exit;
 812                 }
 813
 814                 /*
 815                  * Pass the new package object back to the package walk routine
 816                  */
 817                 state->pkg.this_target_obj = target_object;
 818
 819                 /*
 820                  * Store the object pointer in the parent package object
 821                  */
 822                 *this_target_ptr = target_object;
 823                 break;
 824
 825         default:
 826                 return (AE_BAD_PARAMETER);
 827         }
 828
 829         return (status);
 830
 831       error_exit:
 832         acpi_ut_remove_reference(target_object);
 833         return (status);
 834 }
 835
 836 /*******************************************************************************
 837  *
 838  * FUNCTION:    acpi_ut_copy_ipackage_to_ipackage
 839  *
 840  * PARAMETERS:  *source_obj     - Pointer to the source package object
 841  *              *dest_obj       - Where the internal object is returned
 842  *
 843  * RETURN:      Status          - the status of the call
 844  *
 845  * DESCRIPTION: This function is called to copy an internal package object
 846  *              into another internal package object.
 847  *
 848  ******************************************************************************/
 849
 850 static acpi_status
 851 acpi_ut_copy_ipackage_to_ipackage(union acpi_operand_object *source_obj,
 852                                   union acpi_operand_object *dest_obj,
 853                                   struct acpi_walk_state *walk_state)
 854 {
 855         acpi_status status = AE_OK;
 856
 857         ACPI_FUNCTION_TRACE(ut_copy_ipackage_to_ipackage);
 858
 859         dest_obj->common.type = ACPI_GET_OBJECT_TYPE(source_obj);
 860         dest_obj->common.flags = source_obj->common.flags;
 861         dest_obj->package.count = source_obj->package.count;
 862
 863         /*
 864          * Create the object array and walk the source package tree
 865          */
 866         dest_obj->package.elements = ACPI_ALLOCATE_ZEROED(((acpi_size)
 867                                                            source_obj->package.
 868                                                            count +
 869                                                            1) * sizeof(void *));
 870         if (!dest_obj->package.elements) {
 871                 ACPI_ERROR((AE_INFO, "Package allocation failure"));
 872                 return_ACPI_STATUS(AE_NO_MEMORY);
 873         }
 874
 875         /*
 876          * Copy the package element-by-element by walking the package "tree".
 877          * This handles nested packages of arbitrary depth.
 878          */
 879         status = acpi_ut_walk_package_tree(source_obj, dest_obj,
 880                                            acpi_ut_copy_ielement_to_ielement,
 881                                            walk_state);
 882         if (ACPI_FAILURE(status)) {
 883
 884                 /* On failure, delete the destination package object */
 885
 886                 acpi_ut_remove_reference(dest_obj);
 887         }
 888
 889         return_ACPI_STATUS(status);
 890 }
 891
 892 /*******************************************************************************
 893  *
 894  * FUNCTION:    acpi_ut_copy_iobject_to_iobject
 895  *
 896  * PARAMETERS:  walk_state          - Current walk state
 897  *              source_desc         - The internal object to be copied
 898  *              dest_desc           - Where the copied object is returned
 899  *
 900  * RETURN:      Status
 901  *
 902  * DESCRIPTION: Copy an internal object to a new internal object
 903  *
 904  ******************************************************************************/
 905
 906 acpi_status
 907 acpi_ut_copy_iobject_to_iobject(union acpi_operand_object *source_desc,
 908                                 union acpi_operand_object **dest_desc,
 909                                 struct acpi_walk_state *walk_state)
 910 {
 911         acpi_status status = AE_OK;
 912
 913         ACPI_FUNCTION_TRACE(ut_copy_iobject_to_iobject);
 914
 915         /* Create the top level object */
 916
 917         *dest_desc =
 918             acpi_ut_create_internal_object(ACPI_GET_OBJECT_TYPE(source_desc));
 919         if (!*dest_desc) {
 920                 return_ACPI_STATUS(AE_NO_MEMORY);
 921         }
 922
 923         /* Copy the object and possible subobjects */
 924
 925         if (ACPI_GET_OBJECT_TYPE(source_desc) == ACPI_TYPE_PACKAGE) {
 926                 status =
 927                     acpi_ut_copy_ipackage_to_ipackage(source_desc, *dest_desc,
 928                                                       walk_state);
 929         } else {
 930                 status = acpi_ut_copy_simple_object(source_desc, *dest_desc);
 931         }
 932
 933         return_ACPI_STATUS(status);
 934 }