drivers/bus/acpi/utils/cmcopy.c

   1 /******************************************************************************
   2  *
   3  * Module Name: cmcopy - Internal to external object translation utilities
   4  *              $Revision$
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  *  Copyright (C) 2000, 2001 R. Byron Moore
  10  *
  11  *  This program is free software; you can redistribute it and/or modify
  12  *  it under the terms of the GNU General Public License as published by
  13  *  the Free Software Foundation; either version 2 of the License, or
  14  *  (at your option) any later version.
  15  *
  16  *  This program is distributed in the hope that it will be useful,
  17  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  *  GNU General Public License for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License
  22  *  along with this program; if not, write to the Free Software
  23  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  24  */
  25
  26
  27 #include "acpi.h"
  28 #include "acinterp.h"
  29 #include "acnamesp.h"
  30 #include "amlcode.h"
  31
  32
  33 #define _COMPONENT          ACPI_UTILITIES
  34          MODULE_NAME         ("cmcopy")
  35
  36
  37 /*******************************************************************************
  38  *
  39  * FUNCTION:    Acpi_cm_copy_isimple_to_esimple
  40  *
  41  * PARAMETERS:  *Internal_object    - Pointer to the object we are examining
  42  *              *Buffer             - Where the object is returned
  43  *              *Space_used         - Where the data length is returned
  44  *
  45  * RETURN:      Status
  46  *
  47  * DESCRIPTION: This function is called to place a simple object in a user
  48  *              buffer.
  49  *
  50  *              The buffer is assumed to have sufficient space for the object.
  51  *
  52  ******************************************************************************/
  53
  54 static ACPI_STATUS
  55 acpi_cm_copy_isimple_to_esimple (
  56         ACPI_OPERAND_OBJECT     *internal_object,
  57         ACPI_OBJECT             *external_object,
  58         u8                      *data_space,
  59         u32                     *buffer_space_used)
  60 {
  61         u32                     length = 0;
  62         ACPI_STATUS             status = AE_OK;
  63
  64
  65         /*
  66          * Check for NULL object case (could be an uninitialized
  67          * package element
  68          */
  69
  70         if (!internal_object) {
  71                 *buffer_space_used = 0;
  72                 return (AE_OK);
  73         }
  74
  75         /* Always clear the external object */
  76
  77         MEMSET (external_object, 0, sizeof (ACPI_OBJECT));
  78
  79         /*
  80          * In general, the external object will be the same type as
  81          * the internal object
  82          */
  83
  84         external_object->type = internal_object->common.type;
  85
  86         /* However, only a limited number of external types are supported */
  87
  88         switch (internal_object->common.type) {
  89
  90         case ACPI_TYPE_STRING:
  91
  92                 length = internal_object->string.length + 1;
  93                 external_object->string.length = internal_object->string.length;
  94                 external_object->string.pointer = (NATIVE_CHAR *) data_space;
  95                 MEMCPY ((void *) data_space, (void *) internal_object->string.pointer, length);
  96                 break;
  97
  98
  99         case ACPI_TYPE_BUFFER:
 100
 101                 length = internal_object->buffer.length;
 102                 external_object->buffer.length = internal_object->buffer.length;
 103                 external_object->buffer.pointer = data_space;
 104                 MEMCPY ((void *) data_space, (void *) internal_object->buffer.pointer, length);
 105                 break;
 106
 107
 108         case ACPI_TYPE_INTEGER:
 109
 110                 external_object->integer.value= internal_object->integer.value;
 111                 break;
 112
 113
 114         case INTERNAL_TYPE_REFERENCE:
 115
 116                 /*
 117                  * This is an object reference.  Attempt to dereference it.
 118                  */
 119
 120                 switch (internal_object->reference.opcode) {
 121                 case AML_ZERO_OP:
 122                         external_object->type = ACPI_TYPE_INTEGER;
 123                         external_object->integer.value = 0;
 124                         break;
 125
 126                 case AML_ONE_OP:
 127                         external_object->type = ACPI_TYPE_INTEGER;
 128                         external_object->integer.value = 1;
 129                         break;
 130
 131                 case AML_ONES_OP:
 132                         external_object->type = ACPI_TYPE_INTEGER;
 133                         external_object->integer.value = ACPI_INTEGER_MAX;
 134                         break;
 135
 136                 case AML_NAMEPATH_OP:
 137                         /*
 138                          * This is a named reference, get the string.  We already know that
 139                          * we have room for it, use max length
 140                          */
 141                         length = MAX_STRING_LENGTH;
 142                         external_object->type = ACPI_TYPE_STRING;
 143                         external_object->string.pointer = (NATIVE_CHAR *) data_space;
 144                         status = acpi_ns_handle_to_pathname ((ACPI_HANDLE *) internal_object->reference.node,
 145                                          &length, (char *) data_space);
 146
 147                         /* Converted (external) string length is returned from above */
 148
 149                         external_object->string.length = length;
 150                         break;
 151
 152                 default:
 153                         /*
 154                          * Use the object type of "Any" to indicate a reference
 155                          * to object containing a handle to an ACPI named object.
 156                          */
 157                         external_object->type = ACPI_TYPE_ANY;
 158                         external_object->reference.handle = internal_object->reference.node;
 159                         break;
 160                 }
 161                 break;
 162
 163
 164         case ACPI_TYPE_PROCESSOR:
 165
 166                 external_object->processor.proc_id = internal_object->processor.proc_id;
 167                 external_object->processor.pblk_address = internal_object->processor.address;
 168                 external_object->processor.pblk_length = internal_object->processor.length;
 169                 break;
 170
 171
 172         case ACPI_TYPE_POWER:
 173
 174                 external_object->power_resource.system_level =
 175                                    internal_object->power_resource.system_level;
 176
 177                 external_object->power_resource.resource_order =
 178                                    internal_object->power_resource.resource_order;
 179                 break;
 180
 181
 182         default:
 183                 /*
 184                  * There is no corresponding external object type
 185                  */
 186                 return (AE_SUPPORT);
 187                 break;
 188         }
 189
 190
 191         *buffer_space_used = (u32) ROUND_UP_TO_NATIVE_WORD (length);
 192
 193         return (status);
 194 }
 195
 196
 197 /*******************************************************************************
 198  *
 199  * FUNCTION:    Acpi_cm_copy_ielement_to_eelement
 200  *
 201  * PARAMETERS:  ACPI_PKG_CALLBACK
 202  *
 203  * RETURN:      Status
 204  *
 205  * DESCRIPTION: Copy one package element to another package element
 206  *
 207  ******************************************************************************/
 208
 209 ACPI_STATUS
 210 acpi_cm_copy_ielement_to_eelement (
 211         u8                      object_type,
 212         ACPI_OPERAND_OBJECT     *source_object,
 213         ACPI_GENERIC_STATE      *state,
 214         void                    *context)
 215 {
 216         ACPI_STATUS             status = AE_OK;
 217         ACPI_PKG_INFO           *info = (ACPI_PKG_INFO *) context;
 218         u32                     object_space;
 219         u32                     this_index;
 220         ACPI_OBJECT             *target_object;
 221
 222
 223         this_index      = state->pkg.index;
 224         target_object   = (ACPI_OBJECT *)
 225                            &((ACPI_OBJECT *)(state->pkg.dest_object))->package.elements[this_index];
 226
 227
 228         switch (object_type) {
 229         case ACPI_COPY_TYPE_SIMPLE:
 230
 231                 /*
 232                  * This is a simple or null object -- get the size
 233                  */
 234
 235                 status = acpi_cm_copy_isimple_to_esimple (source_object,
 236                                   target_object, info->free_space, &object_space);
 237                 if (ACPI_FAILURE (status)) {
 238                         return (status);
 239                 }
 240
 241                 break;
 242
 243         case ACPI_COPY_TYPE_PACKAGE:
 244
 245                 /*
 246                  * Build the package object
 247                  */
 248                 target_object->type             = ACPI_TYPE_PACKAGE;
 249                 target_object->package.count    = source_object->package.count;
 250                 target_object->package.elements = (ACPI_OBJECT *) info->free_space;
 251
 252                 /*
 253                  * Pass the new package object back to the package walk routine
 254                  */
 255                 state->pkg.this_target_obj = target_object;
 256
 257                 /*
 258                  * Save space for the array of objects (Package elements)
 259                  * update the buffer length counter
 260                  */
 261                 object_space = (u32) ROUND_UP_TO_NATIVE_WORD (
 262                                    target_object->package.count * sizeof (ACPI_OBJECT));
 263                 break;
 264
 265         default:
 266                 return (AE_BAD_PARAMETER);
 267         }
 268
 269
 270         info->free_space  += object_space;
 271         info->length      += object_space;
 272
 273         return (status);
 274 }
 275
 276
 277 /*******************************************************************************
 278  *
 279  * FUNCTION:    Acpi_cm_copy_ipackage_to_epackage
 280  *
 281  * PARAMETERS:  *Internal_object    - Pointer to the object we are returning
 282  *              *Buffer             - Where the object is returned
 283  *              *Space_used         - Where the object length is returned
 284  *
 285  * RETURN:      Status
 286  *
 287  * DESCRIPTION: This function is called to place a package object in a user
 288  *              buffer.  A package object by definition contains other objects.
 289  *
 290  *              The buffer is assumed to have sufficient space for the object.
 291  *              The caller must have verified the buffer length needed using the
 292  *              Acpi_cm_get_object_size function before calling this function.
 293  *
 294  ******************************************************************************/
 295
 296 static ACPI_STATUS
 297 acpi_cm_copy_ipackage_to_epackage (
 298         ACPI_OPERAND_OBJECT     *internal_object,
 299         u8                      *buffer,
 300         u32                     *space_used)
 301 {
 302         ACPI_OBJECT             *external_object;
 303         ACPI_STATUS             status;
 304         ACPI_PKG_INFO           info;
 305
 306
 307         /*
 308          * First package at head of the buffer
 309          */
 310         external_object = (ACPI_OBJECT *) buffer;
 311
 312         /*
 313          * Free space begins right after the first package
 314          */
 315         info.length      = 0;
 316         info.object_space = 0;
 317         info.num_packages = 1;
 318         info.free_space  = buffer + ROUND_UP_TO_NATIVE_WORD (sizeof (ACPI_OBJECT));
 319
 320
 321         external_object->type              = internal_object->common.type;
 322         external_object->package.count     = internal_object->package.count;
 323         external_object->package.elements  = (ACPI_OBJECT *) info.free_space;
 324
 325
 326         /*
 327          * Build an array of ACPI_OBJECTS in the buffer
 328          * and move the free space past it
 329          */
 330
 331         info.free_space += external_object->package.count *
 332                           ROUND_UP_TO_NATIVE_WORD (sizeof (ACPI_OBJECT));
 333
 334
 335         status = acpi_cm_walk_package_tree (internal_object, external_object,
 336                          acpi_cm_copy_ielement_to_eelement, &info);
 337
 338         *space_used = info.length;
 339
 340         return (status);
 341
 342 }
 343
 344 /*******************************************************************************
 345  *
 346  * FUNCTION:    Acpi_cm_copy_iobject_to_eobject
 347  *
 348  * PARAMETERS:  *Internal_object    - The internal object to be converted
 349  *              *Buffer_ptr         - Where the object is returned
 350  *
 351  * RETURN:      Status
 352  *
 353  * DESCRIPTION: This function is called to build an API object to be returned to
 354  *              the caller.
 355  *
 356  ******************************************************************************/
 357
 358 ACPI_STATUS
 359 acpi_cm_copy_iobject_to_eobject (
 360         ACPI_OPERAND_OBJECT     *internal_object,
 361         ACPI_BUFFER             *ret_buffer)
 362 {
 363         ACPI_STATUS             status;
 364
 365
 366         if (IS_THIS_OBJECT_TYPE (internal_object, ACPI_TYPE_PACKAGE)) {
 367                 /*
 368                  * Package object:  Copy all subobjects (including
 369                  * nested packages)
 370                  */
 371                 status = acpi_cm_copy_ipackage_to_epackage (internal_object,
 372                                   ret_buffer->pointer, &ret_buffer->length);
 373         }
 374
 375         else {
 376                 /*
 377                  * Build a simple object (no nested objects)
 378                  */
 379                 status = acpi_cm_copy_isimple_to_esimple (internal_object,
 380                                   (ACPI_OBJECT *) ret_buffer->pointer,
 381                                   ((u8 *) ret_buffer->pointer +
 382                                   ROUND_UP_TO_NATIVE_WORD (sizeof (ACPI_OBJECT))),
 383                                   &ret_buffer->length);
 384                 /*
 385                  * build simple does not include the object size in the length
 386                  * so we add it in here
 387                  */
 388                 ret_buffer->length += sizeof (ACPI_OBJECT);
 389         }
 390
 391         return (status);
 392 }
 393
 394
 395 /*******************************************************************************
 396  *
 397  * FUNCTION:    Acpi_cm_copy_esimple_to_isimple
 398  *
 399  * PARAMETERS:  *External_object   - The external object to be converted
 400  *              *Internal_object   - Where the internal object is returned
 401  *
 402  * RETURN:      Status
 403  *
 404  * DESCRIPTION: This function copies an external object to an internal one.
 405  *              NOTE: Pointers can be copied, we don't need to copy data.
 406  *              (The pointers have to be valid in our address space no matter
 407  *              what we do with them!)
 408  *
 409  ******************************************************************************/
 410
 411 ACPI_STATUS
 412 acpi_cm_copy_esimple_to_isimple (
 413         ACPI_OBJECT             *external_object,
 414         ACPI_OPERAND_OBJECT     *internal_object)
 415 {
 416
 417
 418         internal_object->common.type = (u8) external_object->type;
 419
 420         switch (external_object->type) {
 421
 422         case ACPI_TYPE_STRING:
 423
 424                 internal_object->string.length = external_object->string.length;
 425                 internal_object->string.pointer = external_object->string.pointer;
 426                 break;
 427
 428
 429         case ACPI_TYPE_BUFFER:
 430
 431                 internal_object->buffer.length = external_object->buffer.length;
 432                 internal_object->buffer.pointer = external_object->buffer.pointer;
 433                 break;
 434
 435
 436         case ACPI_TYPE_INTEGER:
 437                 /*
 438                  * Number is included in the object itself
 439                  */
 440                 internal_object->integer.value  = external_object->integer.value;
 441                 break;
 442
 443
 444         default:
 445                 return (AE_CTRL_RETURN_VALUE);
 446                 break;
 447         }
 448
 449
 450         return (AE_OK);
 451 }
 452
 453
 454 #ifdef ACPI_FUTURE_IMPLEMENTATION
 455
 456 /* Code to convert packages that are parameters to control methods */
 457
 458 /*******************************************************************************
 459  *
 460  * FUNCTION:    Acpi_cm_copy_epackage_to_ipackage
 461  *
 462  * PARAMETERS:  *Internal_object   - Pointer to the object we are returning
 463  *              *Buffer         - Where the object is returned
 464  *              *Space_used     - Where the length of the object is returned
 465  *
 466  * RETURN:      Status          - the status of the call
 467  *
 468  * DESCRIPTION: This function is called to place a package object in a user
 469  *              buffer.  A package object by definition contains other objects.
 470  *
 471  *              The buffer is assumed to have sufficient space for the object.
 472  *              The caller must have verified the buffer length needed using the
 473  *              Acpi_cm_get_object_size function before calling this function.
 474  *
 475  ******************************************************************************/
 476
 477 static ACPI_STATUS
 478 acpi_cm_copy_epackage_to_ipackage (
 479         ACPI_OPERAND_OBJECT     *internal_object,
 480         u8                      *buffer,
 481         u32                     *space_used)
 482 {
 483         u8                      *free_space;
 484         ACPI_OBJECT             *external_object;
 485         u32                     length = 0;
 486         u32                     this_index;
 487         u32                     object_space = 0;
 488         ACPI_OPERAND_OBJECT     *this_internal_obj;
 489         ACPI_OBJECT             *this_external_obj;
 490
 491
 492         /*
 493          * First package at head of the buffer
 494          */
 495         external_object = (ACPI_OBJECT *)buffer;
 496
 497         /*
 498          * Free space begins right after the first package
 499          */
 500         free_space = buffer + sizeof(ACPI_OBJECT);
 501
 502
 503         external_object->type              = internal_object->common.type;
 504         external_object->package.count     = internal_object->package.count;
 505         external_object->package.elements  = (ACPI_OBJECT *)free_space;
 506
 507
 508         /*
 509          * Build an array of ACPI_OBJECTS in the buffer
 510          * and move the free space past it
 511          */
 512
 513         free_space += external_object->package.count * sizeof(ACPI_OBJECT);
 514
 515
 516         /* Call Walk_package */
 517
 518 }
 519
 520 #endif /* Future implementation */
 521
 522
 523 /*******************************************************************************
 524  *
 525  * FUNCTION:    Acpi_cm_copy_eobject_to_iobject
 526  *
 527  * PARAMETERS:  *Internal_object   - The external object to be converted
 528  *              *Buffer_ptr     - Where the internal object is returned
 529  *
 530  * RETURN:      Status          - the status of the call
 531  *
 532  * DESCRIPTION: Converts an external object to an internal object.
 533  *
 534  ******************************************************************************/
 535
 536 ACPI_STATUS
 537 acpi_cm_copy_eobject_to_iobject (
 538         ACPI_OBJECT             *external_object,
 539         ACPI_OPERAND_OBJECT     *internal_object)
 540 {
 541         ACPI_STATUS             status;
 542
 543
 544         if (external_object->type == ACPI_TYPE_PACKAGE) {
 545                 /*
 546                  * Package objects contain other objects (which can be objects)
 547                  * buildpackage does it all
 548                  *
 549                  * TBD: Package conversion must be completed and tested
 550                  * NOTE: this code converts packages as input parameters to
 551                  * control methods only.  This is a very, very rare case.
 552                  */
 553 /*
 554                 Status = Acpi_cm_copy_epackage_to_ipackage(Internal_object,
 555                                  Ret_buffer->Pointer,
 556                                  &Ret_buffer->Length);
 557 */
 558                 return (AE_NOT_IMPLEMENTED);
 559         }
 560
 561         else {
 562                 /*
 563                  * Build a simple object (no nested objects)
 564                  */
 565                 status = acpi_cm_copy_esimple_to_isimple (external_object, internal_object);
 566                 /*
 567                  * build simple does not include the object size in the length
 568                  * so we add it in here
 569                  */
 570         }
 571
 572         return (status);
 573 }
 574
 575
 576 /*******************************************************************************
 577  *
 578  * FUNCTION:    Acpi_cm_copy_ielement_to_ielement
 579  *
 580  * PARAMETERS:  ACPI_PKG_CALLBACK
 581  *
 582  * RETURN:      Status          - the status of the call
 583  *
 584  * DESCRIPTION: Copy one package element to another package element
 585  *
 586  ******************************************************************************/
 587
 588 ACPI_STATUS
 589 acpi_cm_copy_ielement_to_ielement (
 590         u8                      object_type,
 591         ACPI_OPERAND_OBJECT     *source_object,
 592         ACPI_GENERIC_STATE      *state,
 593         void                    *context)
 594 {
 595         ACPI_STATUS             status = AE_OK;
 596         u32                     this_index;
 597         ACPI_OPERAND_OBJECT     **this_target_ptr;
 598         ACPI_OPERAND_OBJECT     *target_object;
 599
 600
 601         this_index    = state->pkg.index;
 602         this_target_ptr = (ACPI_OPERAND_OBJECT **)
 603                            &state->pkg.dest_object->package.elements[this_index];
 604
 605         switch (object_type) {
 606         case 0:
 607
 608                 /*
 609                  * This is a simple object, just copy it
 610                  */
 611                 target_object = acpi_cm_create_internal_object (source_object->common.type);
 612                 if (!target_object) {
 613                         return (AE_NO_MEMORY);
 614                 }
 615
 616                 status = acpi_aml_store_object_to_object (source_object, target_object,
 617                                   (ACPI_WALK_STATE *) context);
 618                 if (ACPI_FAILURE (status)) {
 619                         return (status);
 620                 }
 621
 622                 *this_target_ptr = target_object;
 623                 break;
 624
 625
 626         case 1:
 627                 /*
 628                  * This object is a package - go down another nesting level
 629                  * Create and build the package object
 630                  */
 631                 target_object = acpi_cm_create_internal_object (ACPI_TYPE_PACKAGE);
 632                 if (!target_object) {
 633                         /* TBD: must delete package created up to this point */
 634
 635                         return (AE_NO_MEMORY);
 636                 }
 637
 638                 target_object->package.count = source_object->package.count;
 639
 640                 /*
 641                  * Pass the new package object back to the package walk routine
 642                  */
 643                 state->pkg.this_target_obj = target_object;
 644
 645                 /*
 646                  * Store the object pointer in the parent package object
 647                  */
 648                 *this_target_ptr = target_object;
 649                 break;
 650
 651         default:
 652                 return (AE_BAD_PARAMETER);
 653         }
 654
 655
 656         return (status);
 657 }
 658
 659
 660 /*******************************************************************************
 661  *
 662  * FUNCTION:    Acpi_cm_copy_ipackage_to_ipackage
 663  *
 664  * PARAMETERS:  *Source_obj     - Pointer to the source package object
 665  *              *Dest_obj       - Where the internal object is returned
 666  *
 667  * RETURN:      Status          - the status of the call
 668  *
 669  * DESCRIPTION: This function is called to copy an internal package object
 670  *              into another internal package object.
 671  *
 672  ******************************************************************************/
 673
 674 ACPI_STATUS
 675 acpi_cm_copy_ipackage_to_ipackage (
 676         ACPI_OPERAND_OBJECT     *source_obj,
 677         ACPI_OPERAND_OBJECT     *dest_obj,
 678         ACPI_WALK_STATE         *walk_state)
 679 {
 680         ACPI_STATUS             status = AE_OK;
 681
 682
 683         dest_obj->common.type   = source_obj->common.type;
 684         dest_obj->package.count = source_obj->package.count;
 685
 686
 687         /*
 688          * Create the object array and walk the source package tree
 689          */
 690
 691         dest_obj->package.elements = acpi_cm_callocate ((source_obj->package.count + 1) *
 692                          sizeof (void *));
 693         dest_obj->package.next_element = dest_obj->package.elements;
 694
 695         if (!dest_obj->package.elements) {
 696                 REPORT_ERROR (
 697                         ("Aml_build_copy_internal_package_object: Package allocation failure\n"));
 698                 return (AE_NO_MEMORY);
 699         }
 700
 701
 702         status = acpi_cm_walk_package_tree (source_obj, dest_obj,
 703                          acpi_cm_copy_ielement_to_ielement, walk_state);
 704
 705         return (status);
 706 }
 707