git.oblomov.eu Git - linux-2.6/blob - drivers/acpi/dispatcher/dsopcode.c

   1 /******************************************************************************
   2  *
   3  * Module Name: dsopcode - Dispatcher Op Region support and handling of
   4  *                         "control" opcodes
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2006, R. Byron Moore
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include <acpi/acpi.h>
  46 #include <acpi/acparser.h>
  47 #include <acpi/amlcode.h>
  48 #include <acpi/acdispat.h>
  49 #include <acpi/acinterp.h>
  50 #include <acpi/acnamesp.h>
  51 #include <acpi/acevents.h>
  52
  53 #define _COMPONENT          ACPI_DISPATCHER
  54 ACPI_MODULE_NAME("dsopcode")
  55
  56 /* Local prototypes */
  57 static acpi_status
  58 acpi_ds_execute_arguments(struct acpi_namespace_node *node,
  59                           struct acpi_namespace_node *scope_node,
  60                           u32 aml_length, u8 * aml_start);
  61
  62 static acpi_status
  63 acpi_ds_init_buffer_field(u16 aml_opcode,
  64                           union acpi_operand_object *obj_desc,
  65                           union acpi_operand_object *buffer_desc,
  66                           union acpi_operand_object *offset_desc,
  67                           union acpi_operand_object *length_desc,
  68                           union acpi_operand_object *result_desc);
  69
  70 /*******************************************************************************
  71  *
  72  * FUNCTION:    acpi_ds_execute_arguments
  73  *
  74  * PARAMETERS:  Node                - Object NS node
  75  *              scope_node          - Parent NS node
  76  *              aml_length          - Length of executable AML
  77  *              aml_start           - Pointer to the AML
  78  *
  79  * RETURN:      Status.
  80  *
  81  * DESCRIPTION: Late (deferred) execution of region or field arguments
  82  *
  83  ******************************************************************************/
  84
  85 static acpi_status
  86 acpi_ds_execute_arguments(struct acpi_namespace_node *node,
  87                           struct acpi_namespace_node *scope_node,
  88                           u32 aml_length, u8 * aml_start)
  89 {
  90         acpi_status status;
  91         union acpi_parse_object *op;
  92         struct acpi_walk_state *walk_state;
  93
  94         ACPI_FUNCTION_TRACE("ds_execute_arguments");
  95
  96         /*
  97          * Allocate a new parser op to be the root of the parsed tree
  98          */
  99         op = acpi_ps_alloc_op(AML_INT_EVAL_SUBTREE_OP);
 100         if (!op) {
 101                 return_ACPI_STATUS(AE_NO_MEMORY);
 102         }
 103
 104         /* Save the Node for use in acpi_ps_parse_aml */
 105
 106         op->common.node = scope_node;
 107
 108         /* Create and initialize a new parser state */
 109
 110         walk_state = acpi_ds_create_walk_state(0, NULL, NULL, NULL);
 111         if (!walk_state) {
 112                 status = AE_NO_MEMORY;
 113                 goto cleanup;
 114         }
 115
 116         status = acpi_ds_init_aml_walk(walk_state, op, NULL, aml_start,
 117                                        aml_length, NULL, 1);
 118         if (ACPI_FAILURE(status)) {
 119                 acpi_ds_delete_walk_state(walk_state);
 120                 goto cleanup;
 121         }
 122
 123         /* Mark this parse as a deferred opcode */
 124
 125         walk_state->parse_flags = ACPI_PARSE_DEFERRED_OP;
 126         walk_state->deferred_node = node;
 127
 128         /* Pass1: Parse the entire declaration */
 129
 130         status = acpi_ps_parse_aml(walk_state);
 131         if (ACPI_FAILURE(status)) {
 132                 goto cleanup;
 133         }
 134
 135         /* Get and init the Op created above */
 136
 137         op->common.node = node;
 138         acpi_ps_delete_parse_tree(op);
 139
 140         /* Evaluate the deferred arguments */
 141
 142         op = acpi_ps_alloc_op(AML_INT_EVAL_SUBTREE_OP);
 143         if (!op) {
 144                 return_ACPI_STATUS(AE_NO_MEMORY);
 145         }
 146
 147         op->common.node = scope_node;
 148
 149         /* Create and initialize a new parser state */
 150
 151         walk_state = acpi_ds_create_walk_state(0, NULL, NULL, NULL);
 152         if (!walk_state) {
 153                 status = AE_NO_MEMORY;
 154                 goto cleanup;
 155         }
 156
 157         /* Execute the opcode and arguments */
 158
 159         status = acpi_ds_init_aml_walk(walk_state, op, NULL, aml_start,
 160                                        aml_length, NULL, 3);
 161         if (ACPI_FAILURE(status)) {
 162                 acpi_ds_delete_walk_state(walk_state);
 163                 goto cleanup;
 164         }
 165
 166         /* Mark this execution as a deferred opcode */
 167
 168         walk_state->deferred_node = node;
 169         status = acpi_ps_parse_aml(walk_state);
 170
 171       cleanup:
 172         acpi_ps_delete_parse_tree(op);
 173         return_ACPI_STATUS(status);
 174 }
 175
 176 /*******************************************************************************
 177  *
 178  * FUNCTION:    acpi_ds_get_buffer_field_arguments
 179  *
 180  * PARAMETERS:  obj_desc        - A valid buffer_field object
 181  *
 182  * RETURN:      Status.
 183  *
 184  * DESCRIPTION: Get buffer_field Buffer and Index. This implements the late
 185  *              evaluation of these field attributes.
 186  *
 187  ******************************************************************************/
 188
 189 acpi_status
 190 acpi_ds_get_buffer_field_arguments(union acpi_operand_object *obj_desc)
 191 {
 192         union acpi_operand_object *extra_desc;
 193         struct acpi_namespace_node *node;
 194         acpi_status status;
 195
 196         ACPI_FUNCTION_TRACE_PTR("ds_get_buffer_field_arguments", obj_desc);
 197
 198         if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
 199                 return_ACPI_STATUS(AE_OK);
 200         }
 201
 202         /* Get the AML pointer (method object) and buffer_field node */
 203
 204         extra_desc = acpi_ns_get_secondary_object(obj_desc);
 205         node = obj_desc->buffer_field.node;
 206
 207         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
 208                         (ACPI_TYPE_BUFFER_FIELD, node, NULL));
 209         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "[%4.4s] buffer_field Arg Init\n",
 210                           acpi_ut_get_node_name(node)));
 211
 212         /* Execute the AML code for the term_arg arguments */
 213
 214         status = acpi_ds_execute_arguments(node, acpi_ns_get_parent_node(node),
 215                                            extra_desc->extra.aml_length,
 216                                            extra_desc->extra.aml_start);
 217         return_ACPI_STATUS(status);
 218 }
 219
 220 /*******************************************************************************
 221  *
 222  * FUNCTION:    acpi_ds_get_buffer_arguments
 223  *
 224  * PARAMETERS:  obj_desc        - A valid Buffer object
 225  *
 226  * RETURN:      Status.
 227  *
 228  * DESCRIPTION: Get Buffer length and initializer byte list.  This implements
 229  *              the late evaluation of these attributes.
 230  *
 231  ******************************************************************************/
 232
 233 acpi_status acpi_ds_get_buffer_arguments(union acpi_operand_object *obj_desc)
 234 {
 235         struct acpi_namespace_node *node;
 236         acpi_status status;
 237
 238         ACPI_FUNCTION_TRACE_PTR("ds_get_buffer_arguments", obj_desc);
 239
 240         if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
 241                 return_ACPI_STATUS(AE_OK);
 242         }
 243
 244         /* Get the Buffer node */
 245
 246         node = obj_desc->buffer.node;
 247         if (!node) {
 248                 ACPI_ERROR((AE_INFO,
 249                             "No pointer back to NS node in buffer obj %p",
 250                             obj_desc));
 251                 return_ACPI_STATUS(AE_AML_INTERNAL);
 252         }
 253
 254         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Buffer Arg Init\n"));
 255
 256         /* Execute the AML code for the term_arg arguments */
 257
 258         status = acpi_ds_execute_arguments(node, node,
 259                                            obj_desc->buffer.aml_length,
 260                                            obj_desc->buffer.aml_start);
 261         return_ACPI_STATUS(status);
 262 }
 263
 264 /*******************************************************************************
 265  *
 266  * FUNCTION:    acpi_ds_get_package_arguments
 267  *
 268  * PARAMETERS:  obj_desc        - A valid Package object
 269  *
 270  * RETURN:      Status.
 271  *
 272  * DESCRIPTION: Get Package length and initializer byte list.  This implements
 273  *              the late evaluation of these attributes.
 274  *
 275  ******************************************************************************/
 276
 277 acpi_status acpi_ds_get_package_arguments(union acpi_operand_object *obj_desc)
 278 {
 279         struct acpi_namespace_node *node;
 280         acpi_status status;
 281
 282         ACPI_FUNCTION_TRACE_PTR("ds_get_package_arguments", obj_desc);
 283
 284         if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
 285                 return_ACPI_STATUS(AE_OK);
 286         }
 287
 288         /* Get the Package node */
 289
 290         node = obj_desc->package.node;
 291         if (!node) {
 292                 ACPI_ERROR((AE_INFO,
 293                             "No pointer back to NS node in package %p",
 294                             obj_desc));
 295                 return_ACPI_STATUS(AE_AML_INTERNAL);
 296         }
 297
 298         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Package Arg Init\n"));
 299
 300         /* Execute the AML code for the term_arg arguments */
 301
 302         status = acpi_ds_execute_arguments(node, node,
 303                                            obj_desc->package.aml_length,
 304                                            obj_desc->package.aml_start);
 305         return_ACPI_STATUS(status);
 306 }
 307
 308 /*****************************************************************************
 309  *
 310  * FUNCTION:    acpi_ds_get_region_arguments
 311  *
 312  * PARAMETERS:  obj_desc        - A valid region object
 313  *
 314  * RETURN:      Status.
 315  *
 316  * DESCRIPTION: Get region address and length.  This implements the late
 317  *              evaluation of these region attributes.
 318  *
 319  ****************************************************************************/
 320
 321 acpi_status acpi_ds_get_region_arguments(union acpi_operand_object *obj_desc)
 322 {
 323         struct acpi_namespace_node *node;
 324         acpi_status status;
 325         union acpi_operand_object *extra_desc;
 326
 327         ACPI_FUNCTION_TRACE_PTR("ds_get_region_arguments", obj_desc);
 328
 329         if (obj_desc->region.flags & AOPOBJ_DATA_VALID) {
 330                 return_ACPI_STATUS(AE_OK);
 331         }
 332
 333         extra_desc = acpi_ns_get_secondary_object(obj_desc);
 334         if (!extra_desc) {
 335                 return_ACPI_STATUS(AE_NOT_EXIST);
 336         }
 337
 338         /* Get the Region node */
 339
 340         node = obj_desc->region.node;
 341
 342         ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
 343                         (ACPI_TYPE_REGION, node, NULL));
 344
 345         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 346                           "[%4.4s] op_region Arg Init at AML %p\n",
 347                           acpi_ut_get_node_name(node),
 348                           extra_desc->extra.aml_start));
 349
 350         /* Execute the argument AML */
 351
 352         status = acpi_ds_execute_arguments(node, acpi_ns_get_parent_node(node),
 353                                            extra_desc->extra.aml_length,
 354                                            extra_desc->extra.aml_start);
 355         return_ACPI_STATUS(status);
 356 }
 357
 358 /*******************************************************************************
 359  *
 360  * FUNCTION:    acpi_ds_initialize_region
 361  *
 362  * PARAMETERS:  obj_handle      - Region namespace node
 363  *
 364  * RETURN:      Status
 365  *
 366  * DESCRIPTION: Front end to ev_initialize_region
 367  *
 368  ******************************************************************************/
 369
 370 acpi_status acpi_ds_initialize_region(acpi_handle obj_handle)
 371 {
 372         union acpi_operand_object *obj_desc;
 373         acpi_status status;
 374
 375         obj_desc = acpi_ns_get_attached_object(obj_handle);
 376
 377         /* Namespace is NOT locked */
 378
 379         status = acpi_ev_initialize_region(obj_desc, FALSE);
 380         return (status);
 381 }
 382
 383 /*******************************************************************************
 384  *
 385  * FUNCTION:    acpi_ds_init_buffer_field
 386  *
 387  * PARAMETERS:  aml_opcode      - create_xxx_field
 388  *              obj_desc        - buffer_field object
 389  *              buffer_desc     - Host Buffer
 390  *              offset_desc     - Offset into buffer
 391  *              length_desc     - Length of field (CREATE_FIELD_OP only)
 392  *              result_desc     - Where to store the result
 393  *
 394  * RETURN:      Status
 395  *
 396  * DESCRIPTION: Perform actual initialization of a buffer field
 397  *
 398  ******************************************************************************/
 399
 400 static acpi_status
 401 acpi_ds_init_buffer_field(u16 aml_opcode,
 402                           union acpi_operand_object *obj_desc,
 403                           union acpi_operand_object *buffer_desc,
 404                           union acpi_operand_object *offset_desc,
 405                           union acpi_operand_object *length_desc,
 406                           union acpi_operand_object *result_desc)
 407 {
 408         u32 offset;
 409         u32 bit_offset;
 410         u32 bit_count;
 411         u8 field_flags;
 412         acpi_status status;
 413
 414         ACPI_FUNCTION_TRACE_PTR("ds_init_buffer_field", obj_desc);
 415
 416         /* Host object must be a Buffer */
 417
 418         if (ACPI_GET_OBJECT_TYPE(buffer_desc) != ACPI_TYPE_BUFFER) {
 419                 ACPI_ERROR((AE_INFO,
 420                             "Target of Create Field is not a Buffer object - %s",
 421                             acpi_ut_get_object_type_name(buffer_desc)));
 422
 423                 status = AE_AML_OPERAND_TYPE;
 424                 goto cleanup;
 425         }
 426
 427         /*
 428          * The last parameter to all of these opcodes (result_desc) started
 429          * out as a name_string, and should therefore now be a NS node
 430          * after resolution in acpi_ex_resolve_operands().
 431          */
 432         if (ACPI_GET_DESCRIPTOR_TYPE(result_desc) != ACPI_DESC_TYPE_NAMED) {
 433                 ACPI_ERROR((AE_INFO,
 434                             "(%s) destination not a NS Node [%s]",
 435                             acpi_ps_get_opcode_name(aml_opcode),
 436                             acpi_ut_get_descriptor_name(result_desc)));
 437
 438                 status = AE_AML_OPERAND_TYPE;
 439                 goto cleanup;
 440         }
 441
 442         offset = (u32) offset_desc->integer.value;
 443
 444         /*
 445          * Setup the Bit offsets and counts, according to the opcode
 446          */
 447         switch (aml_opcode) {
 448         case AML_CREATE_FIELD_OP:
 449
 450                 /* Offset is in bits, count is in bits */
 451
 452                 field_flags = AML_FIELD_ACCESS_BYTE;
 453                 bit_offset = offset;
 454                 bit_count = (u32) length_desc->integer.value;
 455
 456                 /* Must have a valid (>0) bit count */
 457
 458                 if (bit_count == 0) {
 459                         ACPI_ERROR((AE_INFO,
 460                                     "Attempt to create_field of length zero"));
 461                         status = AE_AML_OPERAND_VALUE;
 462                         goto cleanup;
 463                 }
 464                 break;
 465
 466         case AML_CREATE_BIT_FIELD_OP:
 467
 468                 /* Offset is in bits, Field is one bit */
 469
 470                 bit_offset = offset;
 471                 bit_count = 1;
 472                 field_flags = AML_FIELD_ACCESS_BYTE;
 473                 break;
 474
 475         case AML_CREATE_BYTE_FIELD_OP:
 476
 477                 /* Offset is in bytes, field is one byte */
 478
 479                 bit_offset = 8 * offset;
 480                 bit_count = 8;
 481                 field_flags = AML_FIELD_ACCESS_BYTE;
 482                 break;
 483
 484         case AML_CREATE_WORD_FIELD_OP:
 485
 486                 /* Offset is in bytes, field is one word */
 487
 488                 bit_offset = 8 * offset;
 489                 bit_count = 16;
 490                 field_flags = AML_FIELD_ACCESS_WORD;
 491                 break;
 492
 493         case AML_CREATE_DWORD_FIELD_OP:
 494
 495                 /* Offset is in bytes, field is one dword */
 496
 497                 bit_offset = 8 * offset;
 498                 bit_count = 32;
 499                 field_flags = AML_FIELD_ACCESS_DWORD;
 500                 break;
 501
 502         case AML_CREATE_QWORD_FIELD_OP:
 503
 504                 /* Offset is in bytes, field is one qword */
 505
 506                 bit_offset = 8 * offset;
 507                 bit_count = 64;
 508                 field_flags = AML_FIELD_ACCESS_QWORD;
 509                 break;
 510
 511         default:
 512
 513                 ACPI_ERROR((AE_INFO,
 514                             "Unknown field creation opcode %02x", aml_opcode));
 515                 status = AE_AML_BAD_OPCODE;
 516                 goto cleanup;
 517         }
 518
 519         /* Entire field must fit within the current length of the buffer */
 520
 521         if ((bit_offset + bit_count) > (8 * (u32) buffer_desc->buffer.length)) {
 522                 ACPI_ERROR((AE_INFO,
 523                             "Field [%4.4s] at %d exceeds Buffer [%4.4s] size %d (bits)",
 524                             acpi_ut_get_node_name(result_desc),
 525                             bit_offset + bit_count,
 526                             acpi_ut_get_node_name(buffer_desc->buffer.node),
 527                             8 * (u32) buffer_desc->buffer.length));
 528                 status = AE_AML_BUFFER_LIMIT;
 529                 goto cleanup;
 530         }
 531
 532         /*
 533          * Initialize areas of the field object that are common to all fields
 534          * For field_flags, use LOCK_RULE = 0 (NO_LOCK),
 535          * UPDATE_RULE = 0 (UPDATE_PRESERVE)
 536          */
 537         status = acpi_ex_prep_common_field_object(obj_desc, field_flags, 0,
 538                                                   bit_offset, bit_count);
 539         if (ACPI_FAILURE(status)) {
 540                 goto cleanup;
 541         }
 542
 543         obj_desc->buffer_field.buffer_obj = buffer_desc;
 544
 545         /* Reference count for buffer_desc inherits obj_desc count */
 546
 547         buffer_desc->common.reference_count = (u16)
 548             (buffer_desc->common.reference_count +
 549              obj_desc->common.reference_count);
 550
 551       cleanup:
 552
 553         /* Always delete the operands */
 554
 555         acpi_ut_remove_reference(offset_desc);
 556         acpi_ut_remove_reference(buffer_desc);
 557
 558         if (aml_opcode == AML_CREATE_FIELD_OP) {
 559                 acpi_ut_remove_reference(length_desc);
 560         }
 561
 562         /* On failure, delete the result descriptor */
 563
 564         if (ACPI_FAILURE(status)) {
 565                 acpi_ut_remove_reference(result_desc);  /* Result descriptor */
 566         } else {
 567                 /* Now the address and length are valid for this buffer_field */
 568
 569                 obj_desc->buffer_field.flags |= AOPOBJ_DATA_VALID;
 570         }
 571
 572         return_ACPI_STATUS(status);
 573 }
 574
 575 /*******************************************************************************
 576  *
 577  * FUNCTION:    acpi_ds_eval_buffer_field_operands
 578  *
 579  * PARAMETERS:  walk_state      - Current walk
 580  *              Op              - A valid buffer_field Op object
 581  *
 582  * RETURN:      Status
 583  *
 584  * DESCRIPTION: Get buffer_field Buffer and Index
 585  *              Called from acpi_ds_exec_end_op during buffer_field parse tree walk
 586  *
 587  ******************************************************************************/
 588
 589 acpi_status
 590 acpi_ds_eval_buffer_field_operands(struct acpi_walk_state *walk_state,
 591                                    union acpi_parse_object *op)
 592 {
 593         acpi_status status;
 594         union acpi_operand_object *obj_desc;
 595         struct acpi_namespace_node *node;
 596         union acpi_parse_object *next_op;
 597
 598         ACPI_FUNCTION_TRACE_PTR("ds_eval_buffer_field_operands", op);
 599
 600         /*
 601          * This is where we evaluate the address and length fields of the
 602          * create_xxx_field declaration
 603          */
 604         node = op->common.node;
 605
 606         /* next_op points to the op that holds the Buffer */
 607
 608         next_op = op->common.value.arg;
 609
 610         /* Evaluate/create the address and length operands */
 611
 612         status = acpi_ds_create_operands(walk_state, next_op);
 613         if (ACPI_FAILURE(status)) {
 614                 return_ACPI_STATUS(status);
 615         }
 616
 617         obj_desc = acpi_ns_get_attached_object(node);
 618         if (!obj_desc) {
 619                 return_ACPI_STATUS(AE_NOT_EXIST);
 620         }
 621
 622         /* Resolve the operands */
 623
 624         status = acpi_ex_resolve_operands(op->common.aml_opcode,
 625                                           ACPI_WALK_OPERANDS, walk_state);
 626
 627         ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE,
 628                            acpi_ps_get_opcode_name(op->common.aml_opcode),
 629                            walk_state->num_operands,
 630                            "after acpi_ex_resolve_operands");
 631
 632         if (ACPI_FAILURE(status)) {
 633                 ACPI_ERROR((AE_INFO, "(%s) bad operand(s) (%X)",
 634                             acpi_ps_get_opcode_name(op->common.aml_opcode),
 635                             status));
 636
 637                 return_ACPI_STATUS(status);
 638         }
 639
 640         /* Initialize the Buffer Field */
 641
 642         if (op->common.aml_opcode == AML_CREATE_FIELD_OP) {
 643                 /* NOTE: Slightly different operands for this opcode */
 644
 645                 status =
 646                     acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
 647                                               walk_state->operands[0],
 648                                               walk_state->operands[1],
 649                                               walk_state->operands[2],
 650                                               walk_state->operands[3]);
 651         } else {
 652                 /* All other, create_xxx_field opcodes */
 653
 654                 status =
 655                     acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
 656                                               walk_state->operands[0],
 657                                               walk_state->operands[1], NULL,
 658                                               walk_state->operands[2]);
 659         }
 660
 661         return_ACPI_STATUS(status);
 662 }
 663
 664 /*******************************************************************************
 665  *
 666  * FUNCTION:    acpi_ds_eval_region_operands
 667  *
 668  * PARAMETERS:  walk_state      - Current walk
 669  *              Op              - A valid region Op object
 670  *
 671  * RETURN:      Status
 672  *
 673  * DESCRIPTION: Get region address and length
 674  *              Called from acpi_ds_exec_end_op during op_region parse tree walk
 675  *
 676  ******************************************************************************/
 677
 678 acpi_status
 679 acpi_ds_eval_region_operands(struct acpi_walk_state *walk_state,
 680                              union acpi_parse_object *op)
 681 {
 682         acpi_status status;
 683         union acpi_operand_object *obj_desc;
 684         union acpi_operand_object *operand_desc;
 685         struct acpi_namespace_node *node;
 686         union acpi_parse_object *next_op;
 687
 688         ACPI_FUNCTION_TRACE_PTR("ds_eval_region_operands", op);
 689
 690         /*
 691          * This is where we evaluate the address and length fields of the
 692          * op_region declaration
 693          */
 694         node = op->common.node;
 695
 696         /* next_op points to the op that holds the space_iD */
 697
 698         next_op = op->common.value.arg;
 699
 700         /* next_op points to address op */
 701
 702         next_op = next_op->common.next;
 703
 704         /* Evaluate/create the address and length operands */
 705
 706         status = acpi_ds_create_operands(walk_state, next_op);
 707         if (ACPI_FAILURE(status)) {
 708                 return_ACPI_STATUS(status);
 709         }
 710
 711         /* Resolve the length and address operands to numbers */
 712
 713         status = acpi_ex_resolve_operands(op->common.aml_opcode,
 714                                           ACPI_WALK_OPERANDS, walk_state);
 715         if (ACPI_FAILURE(status)) {
 716                 return_ACPI_STATUS(status);
 717         }
 718
 719         ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE,
 720                            acpi_ps_get_opcode_name(op->common.aml_opcode),
 721                            1, "after acpi_ex_resolve_operands");
 722
 723         obj_desc = acpi_ns_get_attached_object(node);
 724         if (!obj_desc) {
 725                 return_ACPI_STATUS(AE_NOT_EXIST);
 726         }
 727
 728         /*
 729          * Get the length operand and save it
 730          * (at Top of stack)
 731          */
 732         operand_desc = walk_state->operands[walk_state->num_operands - 1];
 733
 734         obj_desc->region.length = (u32) operand_desc->integer.value;
 735         acpi_ut_remove_reference(operand_desc);
 736
 737         /*
 738          * Get the address and save it
 739          * (at top of stack - 1)
 740          */
 741         operand_desc = walk_state->operands[walk_state->num_operands - 2];
 742
 743         obj_desc->region.address = (acpi_physical_address)
 744             operand_desc->integer.value;
 745         acpi_ut_remove_reference(operand_desc);
 746
 747         ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "rgn_obj %p Addr %8.8X%8.8X Len %X\n",
 748                           obj_desc,
 749                           ACPI_FORMAT_UINT64(obj_desc->region.address),
 750                           obj_desc->region.length));
 751
 752         /* Now the address and length are valid for this opregion */
 753
 754         obj_desc->region.flags |= AOPOBJ_DATA_VALID;
 755
 756         return_ACPI_STATUS(status);
 757 }
 758
 759 /*******************************************************************************
 760  *
 761  * FUNCTION:    acpi_ds_eval_data_object_operands
 762  *
 763  * PARAMETERS:  walk_state      - Current walk
 764  *              Op              - A valid data_object Op object
 765  *              obj_desc        - data_object
 766  *
 767  * RETURN:      Status
 768  *
 769  * DESCRIPTION: Get the operands and complete the following data object types:
 770  *              Buffer, Package.
 771  *
 772  ******************************************************************************/
 773
 774 acpi_status
 775 acpi_ds_eval_data_object_operands(struct acpi_walk_state *walk_state,
 776                                   union acpi_parse_object *op,
 777                                   union acpi_operand_object *obj_desc)
 778 {
 779         acpi_status status;
 780         union acpi_operand_object *arg_desc;
 781         u32 length;
 782
 783         ACPI_FUNCTION_TRACE("ds_eval_data_object_operands");
 784
 785         /* The first operand (for all of these data objects) is the length */
 786
 787         status = acpi_ds_create_operand(walk_state, op->common.value.arg, 1);
 788         if (ACPI_FAILURE(status)) {
 789                 return_ACPI_STATUS(status);
 790         }
 791
 792         status = acpi_ex_resolve_operands(walk_state->opcode,
 793                                           &(walk_state->
 794                                             operands[walk_state->num_operands -
 795                                                      1]), walk_state);
 796         if (ACPI_FAILURE(status)) {
 797                 return_ACPI_STATUS(status);
 798         }
 799
 800         /* Extract length operand */
 801
 802         arg_desc = walk_state->operands[walk_state->num_operands - 1];
 803         length = (u32) arg_desc->integer.value;
 804
 805         /* Cleanup for length operand */
 806
 807         status = acpi_ds_obj_stack_pop(1, walk_state);
 808         if (ACPI_FAILURE(status)) {
 809                 return_ACPI_STATUS(status);
 810         }
 811
 812         acpi_ut_remove_reference(arg_desc);
 813
 814         /*
 815          * Create the actual data object
 816          */
 817         switch (op->common.aml_opcode) {
 818         case AML_BUFFER_OP:
 819
 820                 status =
 821                     acpi_ds_build_internal_buffer_obj(walk_state, op, length,
 822                                                       &obj_desc);
 823                 break;
 824
 825         case AML_PACKAGE_OP:
 826         case AML_VAR_PACKAGE_OP:
 827
 828                 status =
 829                     acpi_ds_build_internal_package_obj(walk_state, op, length,
 830                                                        &obj_desc);
 831                 break;
 832
 833         default:
 834                 return_ACPI_STATUS(AE_AML_BAD_OPCODE);
 835         }
 836
 837         if (ACPI_SUCCESS(status)) {
 838                 /*
 839                  * Return the object in the walk_state, unless the parent is a package -
 840                  * in this case, the return object will be stored in the parse tree
 841                  * for the package.
 842                  */
 843                 if ((!op->common.parent) ||
 844                     ((op->common.parent->common.aml_opcode != AML_PACKAGE_OP) &&
 845                      (op->common.parent->common.aml_opcode !=
 846                       AML_VAR_PACKAGE_OP)
 847                      && (op->common.parent->common.aml_opcode !=
 848                          AML_NAME_OP))) {
 849                         walk_state->result_obj = obj_desc;
 850                 }
 851         }
 852
 853         return_ACPI_STATUS(status);
 854 }
 855
 856 /*******************************************************************************
 857  *
 858  * FUNCTION:    acpi_ds_exec_begin_control_op
 859  *
 860  * PARAMETERS:  walk_list       - The list that owns the walk stack
 861  *              Op              - The control Op
 862  *
 863  * RETURN:      Status
 864  *
 865  * DESCRIPTION: Handles all control ops encountered during control method
 866  *              execution.
 867  *
 868  ******************************************************************************/
 869
 870 acpi_status
 871 acpi_ds_exec_begin_control_op(struct acpi_walk_state *walk_state,
 872                               union acpi_parse_object *op)
 873 {
 874         acpi_status status = AE_OK;
 875         union acpi_generic_state *control_state;
 876
 877         ACPI_FUNCTION_NAME("ds_exec_begin_control_op");
 878
 879         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p Opcode=%2.2X State=%p\n", op,
 880                           op->common.aml_opcode, walk_state));
 881
 882         switch (op->common.aml_opcode) {
 883         case AML_IF_OP:
 884         case AML_WHILE_OP:
 885
 886                 /*
 887                  * IF/WHILE: Create a new control state to manage these
 888                  * constructs. We need to manage these as a stack, in order
 889                  * to handle nesting.
 890                  */
 891                 control_state = acpi_ut_create_control_state();
 892                 if (!control_state) {
 893                         status = AE_NO_MEMORY;
 894                         break;
 895                 }
 896                 /*
 897                  * Save a pointer to the predicate for multiple executions
 898                  * of a loop
 899                  */
 900                 control_state->control.aml_predicate_start =
 901                     walk_state->parser_state.aml - 1;
 902                 control_state->control.package_end =
 903                     walk_state->parser_state.pkg_end;
 904                 control_state->control.opcode = op->common.aml_opcode;
 905
 906                 /* Push the control state on this walk's control stack */
 907
 908                 acpi_ut_push_generic_state(&walk_state->control_state,
 909                                            control_state);
 910                 break;
 911
 912         case AML_ELSE_OP:
 913
 914                 /* Predicate is in the state object */
 915                 /* If predicate is true, the IF was executed, ignore ELSE part */
 916
 917                 if (walk_state->last_predicate) {
 918                         status = AE_CTRL_TRUE;
 919                 }
 920
 921                 break;
 922
 923         case AML_RETURN_OP:
 924
 925                 break;
 926
 927         default:
 928                 break;
 929         }
 930
 931         return (status);
 932 }
 933
 934 /*******************************************************************************
 935  *
 936  * FUNCTION:    acpi_ds_exec_end_control_op
 937  *
 938  * PARAMETERS:  walk_list       - The list that owns the walk stack
 939  *              Op              - The control Op
 940  *
 941  * RETURN:      Status
 942  *
 943  * DESCRIPTION: Handles all control ops encountered during control method
 944  *              execution.
 945  *
 946  ******************************************************************************/
 947
 948 acpi_status
 949 acpi_ds_exec_end_control_op(struct acpi_walk_state * walk_state,
 950                             union acpi_parse_object * op)
 951 {
 952         acpi_status status = AE_OK;
 953         union acpi_generic_state *control_state;
 954
 955         ACPI_FUNCTION_NAME("ds_exec_end_control_op");
 956
 957         switch (op->common.aml_opcode) {
 958         case AML_IF_OP:
 959
 960                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[IF_OP] Op=%p\n", op));
 961
 962                 /*
 963                  * Save the result of the predicate in case there is an
 964                  * ELSE to come
 965                  */
 966                 walk_state->last_predicate =
 967                     (u8) walk_state->control_state->common.value;
 968
 969                 /*
 970                  * Pop the control state that was created at the start
 971                  * of the IF and free it
 972                  */
 973                 control_state =
 974                     acpi_ut_pop_generic_state(&walk_state->control_state);
 975                 acpi_ut_delete_generic_state(control_state);
 976                 break;
 977
 978         case AML_ELSE_OP:
 979
 980                 break;
 981
 982         case AML_WHILE_OP:
 983
 984                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[WHILE_OP] Op=%p\n", op));
 985
 986                 if (walk_state->control_state->common.value) {
 987                         /* Predicate was true, go back and evaluate it again! */
 988
 989                         status = AE_CTRL_PENDING;
 990                 }
 991
 992                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 993                                   "[WHILE_OP] termination! Op=%p\n", op));
 994
 995                 /* Pop this control state and free it */
 996
 997                 control_state =
 998                     acpi_ut_pop_generic_state(&walk_state->control_state);
 999
1000                 walk_state->aml_last_while =
1001                     control_state->control.aml_predicate_start;
1002                 acpi_ut_delete_generic_state(control_state);
1003                 break;
1004
1005         case AML_RETURN_OP:
1006
1007                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1008                                   "[RETURN_OP] Op=%p Arg=%p\n", op,
1009                                   op->common.value.arg));
1010
1011                 /*
1012                  * One optional operand -- the return value
1013                  * It can be either an immediate operand or a result that
1014                  * has been bubbled up the tree
1015                  */
1016                 if (op->common.value.arg) {
1017                         /* Since we have a real Return(), delete any implicit return */
1018
1019                         acpi_ds_clear_implicit_return(walk_state);
1020
1021                         /* Return statement has an immediate operand */
1022
1023                         status =
1024                             acpi_ds_create_operands(walk_state,
1025                                                     op->common.value.arg);
1026                         if (ACPI_FAILURE(status)) {
1027                                 return (status);
1028                         }
1029
1030                         /*
1031                          * If value being returned is a Reference (such as
1032                          * an arg or local), resolve it now because it may
1033                          * cease to exist at the end of the method.
1034                          */
1035                         status =
1036                             acpi_ex_resolve_to_value(&walk_state->operands[0],
1037                                                      walk_state);
1038                         if (ACPI_FAILURE(status)) {
1039                                 return (status);
1040                         }
1041
1042                         /*
1043                          * Get the return value and save as the last result
1044                          * value.  This is the only place where walk_state->return_desc
1045                          * is set to anything other than zero!
1046                          */
1047                         walk_state->return_desc = walk_state->operands[0];
1048                 } else if ((walk_state->results) &&
1049                            (walk_state->results->results.num_results > 0)) {
1050                         /* Since we have a real Return(), delete any implicit return */
1051
1052                         acpi_ds_clear_implicit_return(walk_state);
1053
1054                         /*
1055                          * The return value has come from a previous calculation.
1056                          *
1057                          * If value being returned is a Reference (such as
1058                          * an arg or local), resolve it now because it may
1059                          * cease to exist at the end of the method.
1060                          *
1061                          * Allow references created by the Index operator to return unchanged.
1062                          */
1063                         if ((ACPI_GET_DESCRIPTOR_TYPE
1064                              (walk_state->results->results.obj_desc[0]) ==
1065                              ACPI_DESC_TYPE_OPERAND)
1066                             &&
1067                             (ACPI_GET_OBJECT_TYPE
1068                              (walk_state->results->results.obj_desc[0]) ==
1069                              ACPI_TYPE_LOCAL_REFERENCE)
1070                             && ((walk_state->results->results.obj_desc[0])->
1071                                 reference.opcode != AML_INDEX_OP)) {
1072                                 status =
1073                                     acpi_ex_resolve_to_value(&walk_state->
1074                                                              results->results.
1075                                                              obj_desc[0],
1076                                                              walk_state);
1077                                 if (ACPI_FAILURE(status)) {
1078                                         return (status);
1079                                 }
1080                         }
1081
1082                         walk_state->return_desc =
1083                             walk_state->results->results.obj_desc[0];
1084                 } else {
1085                         /* No return operand */
1086
1087                         if (walk_state->num_operands) {
1088                                 acpi_ut_remove_reference(walk_state->
1089                                                          operands[0]);
1090                         }
1091
1092                         walk_state->operands[0] = NULL;
1093                         walk_state->num_operands = 0;
1094                         walk_state->return_desc = NULL;
1095                 }
1096
1097                 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1098                                   "Completed RETURN_OP State=%p, ret_val=%p\n",
1099                                   walk_state, walk_state->return_desc));
1100
1101                 /* End the control method execution right now */
1102
1103                 status = AE_CTRL_TERMINATE;
1104                 break;
1105
1106         case AML_NOOP_OP:
1107
1108                 /* Just do nothing! */
1109                 break;
1110
1111         case AML_BREAK_POINT_OP:
1112
1113                 /* Call up to the OS service layer to handle this */
1114
1115                 status =
1116                     acpi_os_signal(ACPI_SIGNAL_BREAKPOINT,
1117                                    "Executed AML Breakpoint opcode");
1118
1119                 /* If and when it returns, all done. */
1120
1121                 break;
1122
1123         case AML_BREAK_OP:
1124         case AML_CONTINUE_OP:   /* ACPI 2.0 */
1125
1126                 /* Pop and delete control states until we find a while */
1127
1128                 while (walk_state->control_state &&
1129                        (walk_state->control_state->control.opcode !=
1130                         AML_WHILE_OP)) {
1131                         control_state =
1132                             acpi_ut_pop_generic_state(&walk_state->
1133                                                       control_state);
1134                         acpi_ut_delete_generic_state(control_state);
1135                 }
1136
1137                 /* No while found? */
1138
1139                 if (!walk_state->control_state) {
1140                         return (AE_AML_NO_WHILE);
1141                 }
1142
1143                 /* Was: walk_state->aml_last_while = walk_state->control_state->Control.aml_predicate_start; */
1144
1145                 walk_state->aml_last_while =
1146                     walk_state->control_state->control.package_end;
1147
1148                 /* Return status depending on opcode */
1149
1150                 if (op->common.aml_opcode == AML_BREAK_OP) {
1151                         status = AE_CTRL_BREAK;
1152                 } else {
1153                         status = AE_CTRL_CONTINUE;
1154                 }
1155                 break;
1156
1157         default:
1158
1159                 ACPI_ERROR((AE_INFO, "Unknown control opcode=%X Op=%p",
1160                             op->common.aml_opcode, op));
1161
1162                 status = AE_AML_BAD_OPCODE;
1163                 break;
1164         }
1165
1166         return (status);
1167 }