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 - 2005, 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
  45 #include <acpi/acpi.h>
  46 #include <acpi/amlcode.h>
  47
  48
  49 #define _COMPONENT          ACPI_UTILITIES
  50          ACPI_MODULE_NAME    ("utcopy")
  51
  52 /* Local prototypes */
  53
  54 static acpi_status
  55 acpi_ut_copy_isimple_to_esimple (
  56         union acpi_operand_object       *internal_object,
  57         union acpi_object               *external_object,
  58         u8                              *data_space,
  59         acpi_size                       *buffer_space_used);
  60
  61 static acpi_status
  62 acpi_ut_copy_ielement_to_ielement (
  63         u8                              object_type,
  64         union acpi_operand_object       *source_object,
  65         union acpi_generic_state        *state,
  66         void                            *context);
  67
  68 static acpi_status
  69 acpi_ut_copy_ipackage_to_epackage (
  70         union acpi_operand_object       *internal_object,
  71         u8                              *buffer,
  72         acpi_size                       *space_used);
  73
  74 static acpi_status
  75 acpi_ut_copy_esimple_to_isimple(
  76         union acpi_object               *user_obj,
  77         union acpi_operand_object       **return_obj);
  78
  79 static acpi_status
  80 acpi_ut_copy_simple_object (
  81         union acpi_operand_object       *source_desc,
  82         union acpi_operand_object       *dest_desc);
  83
  84 static acpi_status
  85 acpi_ut_copy_ielement_to_eelement (
  86         u8                              object_type,
  87         union acpi_operand_object       *source_object,
  88         union acpi_generic_state        *state,
  89         void                            *context);
  90
  91 static acpi_status
  92 acpi_ut_copy_ipackage_to_ipackage (
  93         union acpi_operand_object       *source_obj,
  94         union acpi_operand_object       *dest_obj,
  95         struct acpi_walk_state          *walk_state);
  96
  97
  98 /*******************************************************************************
  99  *
 100  * FUNCTION:    acpi_ut_copy_isimple_to_esimple
 101  *
 102  * PARAMETERS:  internal_object     - Source object to be copied
 103  *              external_object     - Where to return the copied object
 104  *              data_space          - Where object data is returned (such as
 105  *                                    buffer and string data)
 106  *              buffer_space_used   - Length of data_space that was used
 107  *
 108  * RETURN:      Status
 109  *
 110  * DESCRIPTION: This function is called to copy a simple internal object to
 111  *              an external object.
 112  *
 113  *              The data_space buffer is assumed to have sufficient space for
 114  *              the object.
 115  *
 116  ******************************************************************************/
 117
 118 static acpi_status
 119 acpi_ut_copy_isimple_to_esimple (
 120         union acpi_operand_object       *internal_object,
 121         union acpi_object               *external_object,
 122         u8                              *data_space,
 123         acpi_size                       *buffer_space_used)
 124 {
 125         acpi_status                     status = AE_OK;
 126
 127
 128         ACPI_FUNCTION_TRACE ("ut_copy_isimple_to_esimple");
 129
 130
 131         *buffer_space_used = 0;
 132
 133         /*
 134          * Check for NULL object case (could be an uninitialized
 135          * package element)
 136          */
 137         if (!internal_object) {
 138                 return_ACPI_STATUS (AE_OK);
 139         }
 140
 141         /* Always clear the external object */
 142
 143         ACPI_MEMSET (external_object, 0, sizeof (union acpi_object));
 144
 145         /*
 146          * In general, the external object will be the same type as
 147          * the internal object
 148          */
 149         external_object->type = ACPI_GET_OBJECT_TYPE (internal_object);
 150
 151         /* However, only a limited number of external types are supported */
 152
 153         switch (ACPI_GET_OBJECT_TYPE (internal_object)) {
 154         case ACPI_TYPE_STRING:
 155
 156                 external_object->string.pointer = (char *) data_space;
 157                 external_object->string.length = internal_object->string.length;
 158                 *buffer_space_used = ACPI_ROUND_UP_TO_NATIVE_WORD (
 159                                    (acpi_size) internal_object->string.length + 1);
 160
 161                 ACPI_MEMCPY ((void *) data_space,
 162                         (void *) internal_object->string.pointer,
 163                         (acpi_size) internal_object->string.length + 1);
 164                 break;
 165
 166
 167         case ACPI_TYPE_BUFFER:
 168
 169                 external_object->buffer.pointer = data_space;
 170                 external_object->buffer.length = internal_object->buffer.length;
 171                 *buffer_space_used = ACPI_ROUND_UP_TO_NATIVE_WORD (
 172                                    internal_object->string.length);
 173
 174                 ACPI_MEMCPY ((void *) data_space,
 175                         (void *) internal_object->buffer.pointer,
 176                         internal_object->buffer.length);
 177                 break;
 178
 179
 180         case ACPI_TYPE_INTEGER:
 181
 182                 external_object->integer.value = internal_object->integer.value;
 183                 break;
 184
 185
 186         case ACPI_TYPE_LOCAL_REFERENCE:
 187
 188                 /*
 189                  * This is an object reference.  Attempt to dereference it.
 190                  */
 191                 switch (internal_object->reference.opcode) {
 192                 case AML_INT_NAMEPATH_OP:
 193
 194                         /* For namepath, return the object handle ("reference") */
 195
 196                 default:
 197                         /*
 198                          * Use the object type of "Any" to indicate a reference
 199                          * to object containing a handle to an ACPI named object.
 200                          */
 201                         external_object->type = ACPI_TYPE_ANY;
 202                         external_object->reference.handle = internal_object->reference.node;
 203                         break;
 204                 }
 205                 break;
 206
 207
 208         case ACPI_TYPE_PROCESSOR:
 209
 210                 external_object->processor.proc_id    = internal_object->processor.proc_id;
 211                 external_object->processor.pblk_address = internal_object->processor.address;
 212                 external_object->processor.pblk_length = internal_object->processor.length;
 213                 break;
 214
 215
 216         case ACPI_TYPE_POWER:
 217
 218                 external_object->power_resource.system_level =
 219                                    internal_object->power_resource.system_level;
 220
 221                 external_object->power_resource.resource_order =
 222                                    internal_object->power_resource.resource_order;
 223                 break;
 224
 225
 226         default:
 227                 /*
 228                  * There is no corresponding external object type
 229                  */
 230                 return_ACPI_STATUS (AE_SUPPORT);
 231         }
 232
 233         return_ACPI_STATUS (status);
 234 }
 235
 236
 237 /*******************************************************************************
 238  *
 239  * FUNCTION:    acpi_ut_copy_ielement_to_eelement
 240  *
 241  * PARAMETERS:  acpi_pkg_callback
 242  *
 243  * RETURN:      Status
 244  *
 245  * DESCRIPTION: Copy one package element to another package element
 246  *
 247  ******************************************************************************/
 248
 249 static acpi_status
 250 acpi_ut_copy_ielement_to_eelement (
 251         u8                              object_type,
 252         union acpi_operand_object       *source_object,
 253         union acpi_generic_state        *state,
 254         void                            *context)
 255 {
 256         acpi_status                     status = AE_OK;
 257         struct acpi_pkg_info            *info = (struct acpi_pkg_info *) context;
 258         acpi_size                       object_space;
 259         u32                             this_index;
 260         union acpi_object               *target_object;
 261
 262
 263         ACPI_FUNCTION_ENTRY ();
 264
 265
 266         this_index   = state->pkg.index;
 267         target_object = (union acpi_object *)
 268                 &((union acpi_object *)(state->pkg.dest_object))->package.elements[this_index];
 269
 270         switch (object_type) {
 271         case ACPI_COPY_TYPE_SIMPLE:
 272
 273                 /*
 274                  * This is a simple or null object
 275                  */
 276                 status = acpi_ut_copy_isimple_to_esimple (source_object,
 277                                   target_object, info->free_space, &object_space);
 278                 if (ACPI_FAILURE (status)) {
 279                         return (status);
 280                 }
 281                 break;
 282
 283
 284         case ACPI_COPY_TYPE_PACKAGE:
 285
 286                 /*
 287                  * Build the package object
 288                  */
 289                 target_object->type             = ACPI_TYPE_PACKAGE;
 290                 target_object->package.count    = source_object->package.count;
 291                 target_object->package.elements =
 292                         ACPI_CAST_PTR (union acpi_object, info->free_space);
 293
 294                 /*
 295                  * Pass the new package object back to the package walk routine
 296                  */
 297                 state->pkg.this_target_obj = target_object;
 298
 299                 /*
 300                  * Save space for the array of objects (Package elements)
 301                  * update the buffer length counter
 302                  */
 303                 object_space = ACPI_ROUND_UP_TO_NATIVE_WORD (
 304                                    (acpi_size) target_object->package.count *
 305                                    sizeof (union acpi_object));
 306                 break;
 307
 308
 309         default:
 310                 return (AE_BAD_PARAMETER);
 311         }
 312
 313         info->free_space  += object_space;
 314         info->length      += object_space;
 315         return (status);
 316 }
 317
 318
 319 /*******************************************************************************
 320  *
 321  * FUNCTION:    acpi_ut_copy_ipackage_to_epackage
 322  *
 323  * PARAMETERS:  internal_object     - Pointer to the object we are returning
 324  *              Buffer              - Where the object is returned
 325  *              space_used          - Where the object length is returned
 326  *
 327  * RETURN:      Status
 328  *
 329  * DESCRIPTION: This function is called to place a package object in a user
 330  *              buffer.  A package object by definition contains other objects.
 331  *
 332  *              The buffer is assumed to have sufficient space for the object.
 333  *              The caller must have verified the buffer length needed using the
 334  *              acpi_ut_get_object_size function before calling this function.
 335  *
 336  ******************************************************************************/
 337
 338 static acpi_status
 339 acpi_ut_copy_ipackage_to_epackage (
 340         union acpi_operand_object       *internal_object,
 341         u8                              *buffer,
 342         acpi_size                       *space_used)
 343 {
 344         union acpi_object               *external_object;
 345         acpi_status                     status;
 346         struct acpi_pkg_info            info;
 347
 348
 349         ACPI_FUNCTION_TRACE ("ut_copy_ipackage_to_epackage");
 350
 351
 352         /*
 353          * First package at head of the buffer
 354          */
 355         external_object = ACPI_CAST_PTR (union acpi_object, buffer);
 356
 357         /*
 358          * Free space begins right after the first package
 359          */
 360         info.length      = ACPI_ROUND_UP_TO_NATIVE_WORD (sizeof (union acpi_object));
 361         info.free_space  = buffer + ACPI_ROUND_UP_TO_NATIVE_WORD (
 362                            sizeof (union acpi_object));
 363         info.object_space = 0;
 364         info.num_packages = 1;
 365
 366         external_object->type            = ACPI_GET_OBJECT_TYPE (internal_object);
 367         external_object->package.count   = internal_object->package.count;
 368         external_object->package.elements = ACPI_CAST_PTR (union acpi_object,
 369                           info.free_space);
 370
 371         /*
 372          * Leave room for an array of ACPI_OBJECTS in the buffer
 373          * and move the free space past it
 374          */
 375         info.length    += (acpi_size) external_object->package.count *
 376                          ACPI_ROUND_UP_TO_NATIVE_WORD (sizeof (union acpi_object));
 377         info.free_space += external_object->package.count *
 378                          ACPI_ROUND_UP_TO_NATIVE_WORD (sizeof (union acpi_object));
 379
 380         status = acpi_ut_walk_package_tree (internal_object, external_object,
 381                          acpi_ut_copy_ielement_to_eelement, &info);
 382
 383         *space_used = info.length;
 384         return_ACPI_STATUS (status);
 385 }
 386
 387
 388 /*******************************************************************************
 389  *
 390  * FUNCTION:    acpi_ut_copy_iobject_to_eobject
 391  *
 392  * PARAMETERS:  internal_object     - The internal object to be converted
 393  *              buffer_ptr          - Where the object is returned
 394  *
 395  * RETURN:      Status
 396  *
 397  * DESCRIPTION: This function is called to build an API object to be returned to
 398  *              the caller.
 399  *
 400  ******************************************************************************/
 401
 402 acpi_status
 403 acpi_ut_copy_iobject_to_eobject (
 404         union acpi_operand_object       *internal_object,
 405         struct acpi_buffer              *ret_buffer)
 406 {
 407         acpi_status                     status;
 408
 409
 410         ACPI_FUNCTION_TRACE ("ut_copy_iobject_to_eobject");
 411
 412
 413         if (ACPI_GET_OBJECT_TYPE (internal_object) == ACPI_TYPE_PACKAGE) {
 414                 /*
 415                  * Package object:  Copy all subobjects (including
 416                  * nested packages)
 417                  */
 418                 status = acpi_ut_copy_ipackage_to_epackage (internal_object,
 419                                   ret_buffer->pointer, &ret_buffer->length);
 420         }
 421         else {
 422                 /*
 423                  * Build a simple object (no nested objects)
 424                  */
 425                 status = acpi_ut_copy_isimple_to_esimple (internal_object,
 426                                  (union acpi_object *) ret_buffer->pointer,
 427                                  ((u8 *) ret_buffer->pointer +
 428                                  ACPI_ROUND_UP_TO_NATIVE_WORD (sizeof (union acpi_object))),
 429                                  &ret_buffer->length);
 430                 /*
 431                  * build simple does not include the object size in the length
 432                  * so we add it in here
 433                  */
 434                 ret_buffer->length += sizeof (union acpi_object);
 435         }
 436
 437         return_ACPI_STATUS (status);
 438 }
 439
 440
 441 /*******************************************************************************
 442  *
 443  * FUNCTION:    acpi_ut_copy_esimple_to_isimple
 444  *
 445  * PARAMETERS:  external_object     - The external object to be converted
 446  *              ret_internal_object - Where the internal object is returned
 447  *
 448  * RETURN:      Status
 449  *
 450  * DESCRIPTION: This function copies an external object to an internal one.
 451  *              NOTE: Pointers can be copied, we don't need to copy data.
 452  *              (The pointers have to be valid in our address space no matter
 453  *              what we do with them!)
 454  *
 455  ******************************************************************************/
 456
 457 static acpi_status
 458 acpi_ut_copy_esimple_to_isimple (
 459         union acpi_object               *external_object,
 460         union acpi_operand_object       **ret_internal_object)
 461 {
 462         union acpi_operand_object       *internal_object;
 463
 464
 465         ACPI_FUNCTION_TRACE ("ut_copy_esimple_to_isimple");
 466
 467
 468         /*
 469          * Simple types supported are: String, Buffer, Integer
 470          */
 471         switch (external_object->type) {
 472         case ACPI_TYPE_STRING:
 473         case ACPI_TYPE_BUFFER:
 474         case ACPI_TYPE_INTEGER:
 475
 476                 internal_object = acpi_ut_create_internal_object (
 477                                    (u8) external_object->type);
 478                 if (!internal_object) {
 479                         return_ACPI_STATUS (AE_NO_MEMORY);
 480                 }
 481                 break;
 482
 483         default:
 484                 /* All other types are not supported */
 485
 486                 return_ACPI_STATUS (AE_SUPPORT);
 487         }
 488
 489
 490         /* Must COPY string and buffer contents */
 491
 492         switch (external_object->type) {
 493         case ACPI_TYPE_STRING:
 494
 495                 internal_object->string.pointer =
 496                         ACPI_MEM_CALLOCATE ((acpi_size) external_object->string.length + 1);
 497                 if (!internal_object->string.pointer) {
 498                         goto error_exit;
 499                 }
 500
 501                 ACPI_MEMCPY (internal_object->string.pointer,
 502                                   external_object->string.pointer,
 503                                   external_object->string.length);
 504
 505                 internal_object->string.length = external_object->string.length;
 506                 break;
 507
 508
 509         case ACPI_TYPE_BUFFER:
 510
 511                 internal_object->buffer.pointer =
 512                         ACPI_MEM_CALLOCATE (external_object->buffer.length);
 513                 if (!internal_object->buffer.pointer) {
 514                         goto error_exit;
 515                 }
 516
 517                 ACPI_MEMCPY (internal_object->buffer.pointer,
 518                                   external_object->buffer.pointer,
 519                                   external_object->buffer.length);
 520
 521                 internal_object->buffer.length = external_object->buffer.length;
 522                 break;
 523
 524
 525         case ACPI_TYPE_INTEGER:
 526
 527                 internal_object->integer.value  = external_object->integer.value;
 528                 break;
 529
 530         default:
 531                 /* Other types can't get here */
 532                 break;
 533         }
 534
 535         *ret_internal_object = internal_object;
 536         return_ACPI_STATUS (AE_OK);
 537
 538
 539 error_exit:
 540         acpi_ut_remove_reference (internal_object);
 541         return_ACPI_STATUS (AE_NO_MEMORY);
 542 }
 543
 544
 545 #ifdef ACPI_FUTURE_IMPLEMENTATION
 546 /* Code to convert packages that are parameters to control methods */
 547
 548 /*******************************************************************************
 549  *
 550  * FUNCTION:    acpi_ut_copy_epackage_to_ipackage
 551  *
 552  * PARAMETERS:  *internal_object   - Pointer to the object we are returning
 553  *              *Buffer            - Where the object is returned
 554  *              *space_used        - Where the length of the object is returned
 555  *
 556  * RETURN:      Status
 557  *
 558  * DESCRIPTION: This function is called to place a package object in a user
 559  *              buffer.  A package object by definition contains other objects.
 560  *
 561  *              The buffer is assumed to have sufficient space for the object.
 562  *              The caller must have verified the buffer length needed using the
 563  *              acpi_ut_get_object_size function before calling this function.
 564  *
 565  ******************************************************************************/
 566
 567 static acpi_status
 568 acpi_ut_copy_epackage_to_ipackage (
 569         union acpi_operand_object       *internal_object,
 570         u8                              *buffer,
 571         u32                             *space_used)
 572 {
 573         u8                              *free_space;
 574         union acpi_object               *external_object;
 575         u32                             length = 0;
 576         u32                             this_index;
 577         u32                             object_space = 0;
 578         union acpi_operand_object       *this_internal_obj;
 579         union acpi_object               *this_external_obj;
 580
 581
 582         ACPI_FUNCTION_TRACE ("ut_copy_epackage_to_ipackage");
 583
 584
 585         /*
 586          * First package at head of the buffer
 587          */
 588         external_object = (union acpi_object *)buffer;
 589
 590         /*
 591          * Free space begins right after the first package
 592          */
 593         free_space = buffer + sizeof(union acpi_object);
 594
 595
 596         external_object->type              = ACPI_GET_OBJECT_TYPE (internal_object);
 597         external_object->package.count     = internal_object->package.count;
 598         external_object->package.elements  = (union acpi_object *)free_space;
 599
 600         /*
 601          * Build an array of ACPI_OBJECTS in the buffer
 602          * and move the free space past it
 603          */
 604         free_space += external_object->package.count * sizeof(union acpi_object);
 605
 606
 607         /* Call walk_package */
 608
 609 }
 610
 611 #endif /* Future implementation */
 612
 613
 614 /*******************************************************************************
 615  *
 616  * FUNCTION:    acpi_ut_copy_eobject_to_iobject
 617  *
 618  * PARAMETERS:  *internal_object   - The external object to be converted
 619  *              *buffer_ptr     - Where the internal object is returned
 620  *
 621  * RETURN:      Status          - the status of the call
 622  *
 623  * DESCRIPTION: Converts an external object to an internal object.
 624  *
 625  ******************************************************************************/
 626
 627 acpi_status
 628 acpi_ut_copy_eobject_to_iobject (
 629         union acpi_object               *external_object,
 630         union acpi_operand_object       **internal_object)
 631 {
 632         acpi_status                     status;
 633
 634
 635         ACPI_FUNCTION_TRACE ("ut_copy_eobject_to_iobject");
 636
 637
 638         if (external_object->type == ACPI_TYPE_PACKAGE) {
 639                 /*
 640                  * Packages as external input to control methods are not supported,
 641                  */
 642                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
 643                         "Packages as parameters not implemented!\n"));
 644
 645                 return_ACPI_STATUS (AE_NOT_IMPLEMENTED);
 646         }
 647
 648         else {
 649                 /*
 650                  * Build a simple object (no nested objects)
 651                  */
 652                 status = acpi_ut_copy_esimple_to_isimple (external_object, internal_object);
 653         }
 654
 655         return_ACPI_STATUS (status);
 656 }
 657
 658
 659 /*******************************************************************************
 660  *
 661  * FUNCTION:    acpi_ut_copy_simple_object
 662  *
 663  * PARAMETERS:  source_desc         - The internal object to be copied
 664  *              dest_desc           - New target object
 665  *
 666  * RETURN:      Status
 667  *
 668  * DESCRIPTION: Simple copy of one internal object to another.  Reference count
 669  *              of the destination object is preserved.
 670  *
 671  ******************************************************************************/
 672
 673 static acpi_status
 674 acpi_ut_copy_simple_object (
 675         union acpi_operand_object       *source_desc,
 676         union acpi_operand_object       *dest_desc)
 677 {
 678         u16                             reference_count;
 679         union acpi_operand_object       *next_object;
 680
 681
 682         /* Save fields from destination that we don't want to overwrite */
 683
 684         reference_count = dest_desc->common.reference_count;
 685         next_object = dest_desc->common.next_object;
 686
 687         /* Copy the entire source object over the destination object*/
 688
 689         ACPI_MEMCPY ((char *) dest_desc, (char *) source_desc,
 690                           sizeof (union acpi_operand_object));
 691
 692         /* Restore the saved fields */
 693
 694         dest_desc->common.reference_count = reference_count;
 695         dest_desc->common.next_object = next_object;
 696
 697         /* New object is not static, regardless of source */
 698
 699         dest_desc->common.flags &= ~AOPOBJ_STATIC_POINTER;
 700
 701         /* Handle the objects with extra data */
 702
 703         switch (ACPI_GET_OBJECT_TYPE (dest_desc)) {
 704         case ACPI_TYPE_BUFFER:
 705                 /*
 706                  * Allocate and copy the actual buffer if and only if:
 707                  * 1) There is a valid buffer pointer
 708                  * 2) The buffer has a length > 0
 709                  */
 710                 if ((source_desc->buffer.pointer) &&
 711                         (source_desc->buffer.length)) {
 712                         dest_desc->buffer.pointer =
 713                                 ACPI_MEM_ALLOCATE (source_desc->buffer.length);
 714                         if (!dest_desc->buffer.pointer) {
 715                                 return (AE_NO_MEMORY);
 716                         }
 717
 718                         /* Copy the actual buffer data */
 719
 720                         ACPI_MEMCPY (dest_desc->buffer.pointer,
 721                                         source_desc->buffer.pointer,
 722                                         source_desc->buffer.length);
 723                 }
 724                 break;
 725
 726         case ACPI_TYPE_STRING:
 727                 /*
 728                  * Allocate and copy the actual string if and only if:
 729                  * 1) There is a valid string pointer
 730                  * (Pointer to a NULL string is allowed)
 731                  */
 732                 if (source_desc->string.pointer) {
 733                         dest_desc->string.pointer =
 734                                 ACPI_MEM_ALLOCATE ((acpi_size) source_desc->string.length + 1);
 735                         if (!dest_desc->string.pointer) {
 736                                 return (AE_NO_MEMORY);
 737                         }
 738
 739                         /* Copy the actual string data */
 740
 741                         ACPI_MEMCPY (dest_desc->string.pointer, source_desc->string.pointer,
 742                                           (acpi_size) source_desc->string.length + 1);
 743                 }
 744                 break;
 745
 746         case ACPI_TYPE_LOCAL_REFERENCE:
 747                 /*
 748                  * We copied the reference object, so we now must add a reference
 749                  * to the object pointed to by the reference
 750                  */
 751                 acpi_ut_add_reference (source_desc->reference.object);
 752                 break;
 753
 754         default:
 755                 /* Nothing to do for other simple objects */
 756                 break;
 757         }
 758
 759         return (AE_OK);
 760 }
 761
 762
 763 /*******************************************************************************
 764  *
 765  * FUNCTION:    acpi_ut_copy_ielement_to_ielement
 766  *
 767  * PARAMETERS:  acpi_pkg_callback
 768  *
 769  * RETURN:      Status
 770  *
 771  * DESCRIPTION: Copy one package element to another package element
 772  *
 773  ******************************************************************************/
 774
 775 static acpi_status
 776 acpi_ut_copy_ielement_to_ielement (
 777         u8                              object_type,
 778         union acpi_operand_object       *source_object,
 779         union acpi_generic_state        *state,
 780         void                            *context)
 781 {
 782         acpi_status                     status = AE_OK;
 783         u32                             this_index;
 784         union acpi_operand_object       **this_target_ptr;
 785         union acpi_operand_object       *target_object;
 786
 787
 788         ACPI_FUNCTION_ENTRY ();
 789
 790
 791         this_index    = state->pkg.index;
 792         this_target_ptr = (union acpi_operand_object **)
 793                            &state->pkg.dest_object->package.elements[this_index];
 794
 795         switch (object_type) {
 796         case ACPI_COPY_TYPE_SIMPLE:
 797
 798                 /* A null source object indicates a (legal) null package element */
 799
 800                 if (source_object) {
 801                         /*
 802                          * This is a simple object, just copy it
 803                          */
 804                         target_object = acpi_ut_create_internal_object (
 805                                            ACPI_GET_OBJECT_TYPE (source_object));
 806                         if (!target_object) {
 807                                 return (AE_NO_MEMORY);
 808                         }
 809
 810                         status = acpi_ut_copy_simple_object (source_object, target_object);
 811                         if (ACPI_FAILURE (status)) {
 812                                 goto error_exit;
 813                         }
 814
 815                         *this_target_ptr = target_object;
 816                 }
 817                 else {
 818                         /* Pass through a null element */
 819
 820                         *this_target_ptr = NULL;
 821                 }
 822                 break;
 823
 824
 825         case ACPI_COPY_TYPE_PACKAGE:
 826
 827                 /*
 828                  * This object is a package - go down another nesting level
 829                  * Create and build the package object
 830                  */
 831                 target_object = acpi_ut_create_internal_object (ACPI_TYPE_PACKAGE);
 832                 if (!target_object) {
 833                         return (AE_NO_MEMORY);
 834                 }
 835
 836                 target_object->package.count = source_object->package.count;
 837                 target_object->common.flags = source_object->common.flags;
 838
 839                 /*
 840                  * Create the object array
 841                  */
 842                 target_object->package.elements =
 843                         ACPI_MEM_CALLOCATE (((acpi_size) source_object->package.count + 1) *
 844                                          sizeof (void *));
 845                 if (!target_object->package.elements) {
 846                         status = AE_NO_MEMORY;
 847                         goto error_exit;
 848                 }
 849
 850                 /*
 851                  * Pass the new package object back to the package walk routine
 852                  */
 853                 state->pkg.this_target_obj = target_object;
 854
 855                 /*
 856                  * Store the object pointer in the parent package object
 857                  */
 858                 *this_target_ptr = target_object;
 859                 break;
 860
 861
 862         default:
 863                 return (AE_BAD_PARAMETER);
 864         }
 865
 866         return (status);
 867
 868 error_exit:
 869         acpi_ut_remove_reference (target_object);
 870         return (status);
 871 }
 872
 873
 874 /*******************************************************************************
 875  *
 876  * FUNCTION:    acpi_ut_copy_ipackage_to_ipackage
 877  *
 878  * PARAMETERS:  *source_obj     - Pointer to the source package object
 879  *              *dest_obj       - Where the internal object is returned
 880  *
 881  * RETURN:      Status          - the status of the call
 882  *
 883  * DESCRIPTION: This function is called to copy an internal package object
 884  *              into another internal package object.
 885  *
 886  ******************************************************************************/
 887
 888 static acpi_status
 889 acpi_ut_copy_ipackage_to_ipackage (
 890         union acpi_operand_object       *source_obj,
 891         union acpi_operand_object       *dest_obj,
 892         struct acpi_walk_state          *walk_state)
 893 {
 894         acpi_status                     status = AE_OK;
 895
 896
 897         ACPI_FUNCTION_TRACE ("ut_copy_ipackage_to_ipackage");
 898
 899
 900         dest_obj->common.type   = ACPI_GET_OBJECT_TYPE (source_obj);
 901         dest_obj->common.flags  = source_obj->common.flags;
 902         dest_obj->package.count = source_obj->package.count;
 903
 904         /*
 905          * Create the object array and walk the source package tree
 906          */
 907         dest_obj->package.elements = ACPI_MEM_CALLOCATE (
 908                            ((acpi_size) source_obj->package.count + 1) *
 909                            sizeof (void *));
 910         if (!dest_obj->package.elements) {
 911                 ACPI_REPORT_ERROR (
 912                         ("aml_build_copy_internal_package_object: Package allocation failure\n"));
 913                 return_ACPI_STATUS (AE_NO_MEMORY);
 914         }
 915
 916         /*
 917          * Copy the package element-by-element by walking the package "tree".
 918          * This handles nested packages of arbitrary depth.
 919          */
 920         status = acpi_ut_walk_package_tree (source_obj, dest_obj,
 921                          acpi_ut_copy_ielement_to_ielement, walk_state);
 922         if (ACPI_FAILURE (status)) {
 923                 /* On failure, delete the destination package object */
 924
 925                 acpi_ut_remove_reference (dest_obj);
 926         }
 927
 928         return_ACPI_STATUS (status);
 929 }
 930
 931
 932 /*******************************************************************************
 933  *
 934  * FUNCTION:    acpi_ut_copy_iobject_to_iobject
 935  *
 936  * PARAMETERS:  walk_state          - Current walk state
 937  *              source_desc         - The internal object to be copied
 938  *              dest_desc           - Where the copied object is returned
 939  *
 940  * RETURN:      Status
 941  *
 942  * DESCRIPTION: Copy an internal object to a new internal object
 943  *
 944  ******************************************************************************/
 945
 946 acpi_status
 947 acpi_ut_copy_iobject_to_iobject (
 948         union acpi_operand_object       *source_desc,
 949         union acpi_operand_object       **dest_desc,
 950         struct acpi_walk_state          *walk_state)
 951 {
 952         acpi_status                     status = AE_OK;
 953
 954
 955         ACPI_FUNCTION_TRACE ("ut_copy_iobject_to_iobject");
 956
 957
 958         /* Create the top level object */
 959
 960         *dest_desc = acpi_ut_create_internal_object (ACPI_GET_OBJECT_TYPE (source_desc));
 961         if (!*dest_desc) {
 962                 return_ACPI_STATUS (AE_NO_MEMORY);
 963         }
 964
 965         /* Copy the object and possible subobjects */
 966
 967         if (ACPI_GET_OBJECT_TYPE (source_desc) == ACPI_TYPE_PACKAGE) {
 968                 status = acpi_ut_copy_ipackage_to_ipackage (source_desc, *dest_desc,
 969                                   walk_state);
 970         }
 971         else {
 972                 status = acpi_ut_copy_simple_object (source_desc, *dest_desc);
 973         }
 974
 975         return_ACPI_STATUS (status);
 976 }
 977
 978