drivers/acpi/acpica/psargs.c

   1 /******************************************************************************
   2  *
   3  * Module Name: psargs - Parse AML opcode arguments
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2017, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "acparser.h"
  47 #include "amlcode.h"
  48 #include "acnamesp.h"
  49 #include "acdispat.h"
  50
  51 #define _COMPONENT          ACPI_PARSER
  52 ACPI_MODULE_NAME("psargs")
  53
  54 /* Local prototypes */
  55 static u32
  56 acpi_ps_get_next_package_length(struct acpi_parse_state *parser_state);
  57
  58 static union acpi_parse_object *acpi_ps_get_next_field(struct acpi_parse_state
  59                                                        *parser_state);
  60
  61 /*******************************************************************************
  62  *
  63  * FUNCTION:    acpi_ps_get_next_package_length
  64  *
  65  * PARAMETERS:  parser_state        - Current parser state object
  66  *
  67  * RETURN:      Decoded package length. On completion, the AML pointer points
  68  *              past the length byte or bytes.
  69  *
  70  * DESCRIPTION: Decode and return a package length field.
  71  *              Note: Largest package length is 28 bits, from ACPI specification
  72  *
  73  ******************************************************************************/
  74
  75 static u32
  76 acpi_ps_get_next_package_length(struct acpi_parse_state *parser_state)
  77 {
  78         u8 *aml = parser_state->aml;
  79         u32 package_length = 0;
  80         u32 byte_count;
  81         u8 byte_zero_mask = 0x3F;       /* Default [0:5] */
  82
  83         ACPI_FUNCTION_TRACE(ps_get_next_package_length);
  84
  85         /*
  86          * Byte 0 bits [6:7] contain the number of additional bytes
  87          * used to encode the package length, either 0,1,2, or 3
  88          */
  89         byte_count = (aml[0] >> 6);
  90         parser_state->aml += ((acpi_size)byte_count + 1);
  91
  92         /* Get bytes 3, 2, 1 as needed */
  93
  94         while (byte_count) {
  95                 /*
  96                  * Final bit positions for the package length bytes:
  97                  *      Byte3->[20:27]
  98                  *      Byte2->[12:19]
  99                  *      Byte1->[04:11]
 100                  *      Byte0->[00:03]
 101                  */
 102                 package_length |= (aml[byte_count] << ((byte_count << 3) - 4));
 103
 104                 byte_zero_mask = 0x0F;  /* Use bits [0:3] of byte 0 */
 105                 byte_count--;
 106         }
 107
 108         /* Byte 0 is a special case, either bits [0:3] or [0:5] are used */
 109
 110         package_length |= (aml[0] & byte_zero_mask);
 111         return_UINT32(package_length);
 112 }
 113
 114 /*******************************************************************************
 115  *
 116  * FUNCTION:    acpi_ps_get_next_package_end
 117  *
 118  * PARAMETERS:  parser_state        - Current parser state object
 119  *
 120  * RETURN:      Pointer to end-of-package +1
 121  *
 122  * DESCRIPTION: Get next package length and return a pointer past the end of
 123  *              the package. Consumes the package length field
 124  *
 125  ******************************************************************************/
 126
 127 u8 *acpi_ps_get_next_package_end(struct acpi_parse_state *parser_state)
 128 {
 129         u8 *start = parser_state->aml;
 130         u32 package_length;
 131
 132         ACPI_FUNCTION_TRACE(ps_get_next_package_end);
 133
 134         /* Function below updates parser_state->Aml */
 135
 136         package_length = acpi_ps_get_next_package_length(parser_state);
 137
 138         return_PTR(start + package_length);     /* end of package */
 139 }
 140
 141 /*******************************************************************************
 142  *
 143  * FUNCTION:    acpi_ps_get_next_namestring
 144  *
 145  * PARAMETERS:  parser_state        - Current parser state object
 146  *
 147  * RETURN:      Pointer to the start of the name string (pointer points into
 148  *              the AML.
 149  *
 150  * DESCRIPTION: Get next raw namestring within the AML stream. Handles all name
 151  *              prefix characters. Set parser state to point past the string.
 152  *              (Name is consumed from the AML.)
 153  *
 154  ******************************************************************************/
 155
 156 char *acpi_ps_get_next_namestring(struct acpi_parse_state *parser_state)
 157 {
 158         u8 *start = parser_state->aml;
 159         u8 *end = parser_state->aml;
 160
 161         ACPI_FUNCTION_TRACE(ps_get_next_namestring);
 162
 163         /* Point past any namestring prefix characters (backslash or carat) */
 164
 165         while (ACPI_IS_ROOT_PREFIX(*end) || ACPI_IS_PARENT_PREFIX(*end)) {
 166                 end++;
 167         }
 168
 169         /* Decode the path prefix character */
 170
 171         switch (*end) {
 172         case 0:
 173
 174                 /* null_name */
 175
 176                 if (end == start) {
 177                         start = NULL;
 178                 }
 179                 end++;
 180                 break;
 181
 182         case AML_DUAL_NAME_PREFIX:
 183
 184                 /* Two name segments */
 185
 186                 end += 1 + (2 * ACPI_NAME_SIZE);
 187                 break;
 188
 189         case AML_MULTI_NAME_PREFIX:
 190
 191                 /* Multiple name segments, 4 chars each, count in next byte */
 192
 193                 end += 2 + (*(end + 1) * ACPI_NAME_SIZE);
 194                 break;
 195
 196         default:
 197
 198                 /* Single name segment */
 199
 200                 end += ACPI_NAME_SIZE;
 201                 break;
 202         }
 203
 204         parser_state->aml = end;
 205         return_PTR((char *)start);
 206 }
 207
 208 /*******************************************************************************
 209  *
 210  * FUNCTION:    acpi_ps_get_next_namepath
 211  *
 212  * PARAMETERS:  parser_state        - Current parser state object
 213  *              arg                 - Where the namepath will be stored
 214  *              arg_count           - If the namepath points to a control method
 215  *                                    the method's argument is returned here.
 216  *              possible_method_call - Whether the namepath can possibly be the
 217  *                                    start of a method call
 218  *
 219  * RETURN:      Status
 220  *
 221  * DESCRIPTION: Get next name (if method call, return # of required args).
 222  *              Names are looked up in the internal namespace to determine
 223  *              if the name represents a control method. If a method
 224  *              is found, the number of arguments to the method is returned.
 225  *              This information is critical for parsing to continue correctly.
 226  *
 227  ******************************************************************************/
 228
 229 acpi_status
 230 acpi_ps_get_next_namepath(struct acpi_walk_state *walk_state,
 231                           struct acpi_parse_state *parser_state,
 232                           union acpi_parse_object *arg, u8 possible_method_call)
 233 {
 234         acpi_status status;
 235         char *path;
 236         union acpi_parse_object *name_op;
 237         union acpi_operand_object *method_desc;
 238         struct acpi_namespace_node *node;
 239         u8 *start = parser_state->aml;
 240
 241         ACPI_FUNCTION_TRACE(ps_get_next_namepath);
 242
 243         path = acpi_ps_get_next_namestring(parser_state);
 244         acpi_ps_init_op(arg, AML_INT_NAMEPATH_OP);
 245
 246         /* Null path case is allowed, just exit */
 247
 248         if (!path) {
 249                 arg->common.value.name = path;
 250                 return_ACPI_STATUS(AE_OK);
 251         }
 252
 253         /*
 254          * Lookup the name in the internal namespace, starting with the current
 255          * scope. We don't want to add anything new to the namespace here,
 256          * however, so we use MODE_EXECUTE.
 257          * Allow searching of the parent tree, but don't open a new scope -
 258          * we just want to lookup the object (must be mode EXECUTE to perform
 259          * the upsearch)
 260          */
 261         status = acpi_ns_lookup(walk_state->scope_info, path,
 262                                 ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
 263                                 ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE,
 264                                 NULL, &node);
 265
 266         /*
 267          * If this name is a control method invocation, we must
 268          * setup the method call
 269          */
 270         if (ACPI_SUCCESS(status) &&
 271             possible_method_call && (node->type == ACPI_TYPE_METHOD)) {
 272                 if ((GET_CURRENT_ARG_TYPE(walk_state->arg_types) ==
 273                      ARGP_SUPERNAME)
 274                     || (GET_CURRENT_ARG_TYPE(walk_state->arg_types) ==
 275                         ARGP_TARGET)) {
 276                         /*
 277                          * acpi_ps_get_next_namestring has increased the AML pointer past
 278                          * the method invocation namestring, so we need to restore the
 279                          * saved AML pointer back to the original method invocation
 280                          * namestring.
 281                          */
 282                         walk_state->parser_state.aml = start;
 283                         walk_state->arg_count = 1;
 284                         acpi_ps_init_op(arg, AML_INT_METHODCALL_OP);
 285                 }
 286
 287                 /* This name is actually a control method invocation */
 288
 289                 method_desc = acpi_ns_get_attached_object(node);
 290                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 291                                   "Control Method invocation %4.4s - %p Desc %p Path=%p\n",
 292                                   node->name.ascii, node, method_desc, path));
 293
 294                 name_op = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP, start);
 295                 if (!name_op) {
 296                         return_ACPI_STATUS(AE_NO_MEMORY);
 297                 }
 298
 299                 /* Change Arg into a METHOD CALL and attach name to it */
 300
 301                 acpi_ps_init_op(arg, AML_INT_METHODCALL_OP);
 302                 name_op->common.value.name = path;
 303
 304                 /* Point METHODCALL/NAME to the METHOD Node */
 305
 306                 name_op->common.node = node;
 307                 acpi_ps_append_arg(arg, name_op);
 308
 309                 if (!method_desc) {
 310                         ACPI_ERROR((AE_INFO,
 311                                     "Control Method %p has no attached object",
 312                                     node));
 313                         return_ACPI_STATUS(AE_AML_INTERNAL);
 314                 }
 315
 316                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 317                                   "Control Method - %p Args %X\n",
 318                                   node, method_desc->method.param_count));
 319
 320                 /* Get the number of arguments to expect */
 321
 322                 walk_state->arg_count = method_desc->method.param_count;
 323                 return_ACPI_STATUS(AE_OK);
 324         }
 325
 326         /*
 327          * Special handling if the name was not found during the lookup -
 328          * some not_found cases are allowed
 329          */
 330         if (status == AE_NOT_FOUND) {
 331
 332                 /* 1) not_found is ok during load pass 1/2 (allow forward references) */
 333
 334                 if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) !=
 335                     ACPI_PARSE_EXECUTE) {
 336                         status = AE_OK;
 337                 }
 338
 339                 /* 2) not_found during a cond_ref_of(x) is ok by definition */
 340
 341                 else if (walk_state->op->common.aml_opcode ==
 342                          AML_CONDITIONAL_REF_OF_OP) {
 343                         status = AE_OK;
 344                 }
 345
 346                 /*
 347                  * 3) not_found while building a Package is ok at this point, we
 348                  * may flag as an error later if slack mode is not enabled.
 349                  * (Some ASL code depends on allowing this behavior)
 350                  */
 351                 else if ((arg->common.parent) &&
 352                          ((arg->common.parent->common.aml_opcode ==
 353                            AML_PACKAGE_OP)
 354                           || (arg->common.parent->common.aml_opcode ==
 355                               AML_VARIABLE_PACKAGE_OP))) {
 356                         status = AE_OK;
 357                 }
 358         }
 359
 360         /* Final exception check (may have been changed from code above) */
 361
 362         if (ACPI_FAILURE(status)) {
 363                 ACPI_ERROR_NAMESPACE(path, status);
 364
 365                 if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) ==
 366                     ACPI_PARSE_EXECUTE) {
 367
 368                         /* Report a control method execution error */
 369
 370                         status = acpi_ds_method_error(status, walk_state);
 371                 }
 372         }
 373
 374         /* Save the namepath */
 375
 376         arg->common.value.name = path;
 377         return_ACPI_STATUS(status);
 378 }
 379
 380 /*******************************************************************************
 381  *
 382  * FUNCTION:    acpi_ps_get_next_simple_arg
 383  *
 384  * PARAMETERS:  parser_state        - Current parser state object
 385  *              arg_type            - The argument type (AML_*_ARG)
 386  *              arg                 - Where the argument is returned
 387  *
 388  * RETURN:      None
 389  *
 390  * DESCRIPTION: Get the next simple argument (constant, string, or namestring)
 391  *
 392  ******************************************************************************/
 393
 394 void
 395 acpi_ps_get_next_simple_arg(struct acpi_parse_state *parser_state,
 396                             u32 arg_type, union acpi_parse_object *arg)
 397 {
 398         u32 length;
 399         u16 opcode;
 400         u8 *aml = parser_state->aml;
 401
 402         ACPI_FUNCTION_TRACE_U32(ps_get_next_simple_arg, arg_type);
 403
 404         switch (arg_type) {
 405         case ARGP_BYTEDATA:
 406
 407                 /* Get 1 byte from the AML stream */
 408
 409                 opcode = AML_BYTE_OP;
 410                 arg->common.value.integer = (u64) *aml;
 411                 length = 1;
 412                 break;
 413
 414         case ARGP_WORDDATA:
 415
 416                 /* Get 2 bytes from the AML stream */
 417
 418                 opcode = AML_WORD_OP;
 419                 ACPI_MOVE_16_TO_64(&arg->common.value.integer, aml);
 420                 length = 2;
 421                 break;
 422
 423         case ARGP_DWORDDATA:
 424
 425                 /* Get 4 bytes from the AML stream */
 426
 427                 opcode = AML_DWORD_OP;
 428                 ACPI_MOVE_32_TO_64(&arg->common.value.integer, aml);
 429                 length = 4;
 430                 break;
 431
 432         case ARGP_QWORDDATA:
 433
 434                 /* Get 8 bytes from the AML stream */
 435
 436                 opcode = AML_QWORD_OP;
 437                 ACPI_MOVE_64_TO_64(&arg->common.value.integer, aml);
 438                 length = 8;
 439                 break;
 440
 441         case ARGP_CHARLIST:
 442
 443                 /* Get a pointer to the string, point past the string */
 444
 445                 opcode = AML_STRING_OP;
 446                 arg->common.value.string = ACPI_CAST_PTR(char, aml);
 447
 448                 /* Find the null terminator */
 449
 450                 length = 0;
 451                 while (aml[length]) {
 452                         length++;
 453                 }
 454                 length++;
 455                 break;
 456
 457         case ARGP_NAME:
 458         case ARGP_NAMESTRING:
 459
 460                 acpi_ps_init_op(arg, AML_INT_NAMEPATH_OP);
 461                 arg->common.value.name =
 462                     acpi_ps_get_next_namestring(parser_state);
 463                 return_VOID;
 464
 465         default:
 466
 467                 ACPI_ERROR((AE_INFO, "Invalid ArgType 0x%X", arg_type));
 468                 return_VOID;
 469         }
 470
 471         acpi_ps_init_op(arg, opcode);
 472         parser_state->aml += length;
 473         return_VOID;
 474 }
 475
 476 /*******************************************************************************
 477  *
 478  * FUNCTION:    acpi_ps_get_next_field
 479  *
 480  * PARAMETERS:  parser_state        - Current parser state object
 481  *
 482  * RETURN:      A newly allocated FIELD op
 483  *
 484  * DESCRIPTION: Get next field (named_field, reserved_field, or access_field)
 485  *
 486  ******************************************************************************/
 487
 488 static union acpi_parse_object *acpi_ps_get_next_field(struct acpi_parse_state
 489                                                        *parser_state)
 490 {
 491         u8 *aml;
 492         union acpi_parse_object *field;
 493         union acpi_parse_object *arg = NULL;
 494         u16 opcode;
 495         u32 name;
 496         u8 access_type;
 497         u8 access_attribute;
 498         u8 access_length;
 499         u32 pkg_length;
 500         u8 *pkg_end;
 501         u32 buffer_length;
 502
 503         ACPI_FUNCTION_TRACE(ps_get_next_field);
 504
 505         aml = parser_state->aml;
 506
 507         /* Determine field type */
 508
 509         switch (ACPI_GET8(parser_state->aml)) {
 510         case AML_FIELD_OFFSET_OP:
 511
 512                 opcode = AML_INT_RESERVEDFIELD_OP;
 513                 parser_state->aml++;
 514                 break;
 515
 516         case AML_FIELD_ACCESS_OP:
 517
 518                 opcode = AML_INT_ACCESSFIELD_OP;
 519                 parser_state->aml++;
 520                 break;
 521
 522         case AML_FIELD_CONNECTION_OP:
 523
 524                 opcode = AML_INT_CONNECTION_OP;
 525                 parser_state->aml++;
 526                 break;
 527
 528         case AML_FIELD_EXT_ACCESS_OP:
 529
 530                 opcode = AML_INT_EXTACCESSFIELD_OP;
 531                 parser_state->aml++;
 532                 break;
 533
 534         default:
 535
 536                 opcode = AML_INT_NAMEDFIELD_OP;
 537                 break;
 538         }
 539
 540         /* Allocate a new field op */
 541
 542         field = acpi_ps_alloc_op(opcode, aml);
 543         if (!field) {
 544                 return_PTR(NULL);
 545         }
 546
 547         /* Decode the field type */
 548
 549         switch (opcode) {
 550         case AML_INT_NAMEDFIELD_OP:
 551
 552                 /* Get the 4-character name */
 553
 554                 ACPI_MOVE_32_TO_32(&name, parser_state->aml);
 555                 acpi_ps_set_name(field, name);
 556                 parser_state->aml += ACPI_NAME_SIZE;
 557
 558                 /* Get the length which is encoded as a package length */
 559
 560                 field->common.value.size =
 561                     acpi_ps_get_next_package_length(parser_state);
 562                 break;
 563
 564         case AML_INT_RESERVEDFIELD_OP:
 565
 566                 /* Get the length which is encoded as a package length */
 567
 568                 field->common.value.size =
 569                     acpi_ps_get_next_package_length(parser_state);
 570                 break;
 571
 572         case AML_INT_ACCESSFIELD_OP:
 573         case AML_INT_EXTACCESSFIELD_OP:
 574
 575                 /*
 576                  * Get access_type and access_attrib and merge into the field Op
 577                  * access_type is first operand, access_attribute is second. stuff
 578                  * these bytes into the node integer value for convenience.
 579                  */
 580
 581                 /* Get the two bytes (Type/Attribute) */
 582
 583                 access_type = ACPI_GET8(parser_state->aml);
 584                 parser_state->aml++;
 585                 access_attribute = ACPI_GET8(parser_state->aml);
 586                 parser_state->aml++;
 587
 588                 field->common.value.integer = (u8)access_type;
 589                 field->common.value.integer |= (u16)(access_attribute << 8);
 590
 591                 /* This opcode has a third byte, access_length */
 592
 593                 if (opcode == AML_INT_EXTACCESSFIELD_OP) {
 594                         access_length = ACPI_GET8(parser_state->aml);
 595                         parser_state->aml++;
 596
 597                         field->common.value.integer |=
 598                             (u32)(access_length << 16);
 599                 }
 600                 break;
 601
 602         case AML_INT_CONNECTION_OP:
 603
 604                 /*
 605                  * Argument for Connection operator can be either a Buffer
 606                  * (resource descriptor), or a name_string.
 607                  */
 608                 aml = parser_state->aml;
 609                 if (ACPI_GET8(parser_state->aml) == AML_BUFFER_OP) {
 610                         parser_state->aml++;
 611
 612                         pkg_end = parser_state->aml;
 613                         pkg_length =
 614                             acpi_ps_get_next_package_length(parser_state);
 615                         pkg_end += pkg_length;
 616
 617                         if (parser_state->aml < pkg_end) {
 618
 619                                 /* Non-empty list */
 620
 621                                 arg =
 622                                     acpi_ps_alloc_op(AML_INT_BYTELIST_OP, aml);
 623                                 if (!arg) {
 624                                         acpi_ps_free_op(field);
 625                                         return_PTR(NULL);
 626                                 }
 627
 628                                 /* Get the actual buffer length argument */
 629
 630                                 opcode = ACPI_GET8(parser_state->aml);
 631                                 parser_state->aml++;
 632
 633                                 switch (opcode) {
 634                                 case AML_BYTE_OP:       /* AML_BYTEDATA_ARG */
 635
 636                                         buffer_length =
 637                                             ACPI_GET8(parser_state->aml);
 638                                         parser_state->aml += 1;
 639                                         break;
 640
 641                                 case AML_WORD_OP:       /* AML_WORDDATA_ARG */
 642
 643                                         buffer_length =
 644                                             ACPI_GET16(parser_state->aml);
 645                                         parser_state->aml += 2;
 646                                         break;
 647
 648                                 case AML_DWORD_OP:      /* AML_DWORDATA_ARG */
 649
 650                                         buffer_length =
 651                                             ACPI_GET32(parser_state->aml);
 652                                         parser_state->aml += 4;
 653                                         break;
 654
 655                                 default:
 656
 657                                         buffer_length = 0;
 658                                         break;
 659                                 }
 660
 661                                 /* Fill in bytelist data */
 662
 663                                 arg->named.value.size = buffer_length;
 664                                 arg->named.data = parser_state->aml;
 665                         }
 666
 667                         /* Skip to End of byte data */
 668
 669                         parser_state->aml = pkg_end;
 670                 } else {
 671                         arg = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP, aml);
 672                         if (!arg) {
 673                                 acpi_ps_free_op(field);
 674                                 return_PTR(NULL);
 675                         }
 676
 677                         /* Get the Namestring argument */
 678
 679                         arg->common.value.name =
 680                             acpi_ps_get_next_namestring(parser_state);
 681                 }
 682
 683                 /* Link the buffer/namestring to parent (CONNECTION_OP) */
 684
 685                 acpi_ps_append_arg(field, arg);
 686                 break;
 687
 688         default:
 689
 690                 /* Opcode was set in previous switch */
 691                 break;
 692         }
 693
 694         return_PTR(field);
 695 }
 696
 697 /*******************************************************************************
 698  *
 699  * FUNCTION:    acpi_ps_get_next_arg
 700  *
 701  * PARAMETERS:  walk_state          - Current state
 702  *              parser_state        - Current parser state object
 703  *              arg_type            - The argument type (AML_*_ARG)
 704  *              return_arg          - Where the next arg is returned
 705  *
 706  * RETURN:      Status, and an op object containing the next argument.
 707  *
 708  * DESCRIPTION: Get next argument (including complex list arguments that require
 709  *              pushing the parser stack)
 710  *
 711  ******************************************************************************/
 712
 713 acpi_status
 714 acpi_ps_get_next_arg(struct acpi_walk_state *walk_state,
 715                      struct acpi_parse_state *parser_state,
 716                      u32 arg_type, union acpi_parse_object **return_arg)
 717 {
 718         union acpi_parse_object *arg = NULL;
 719         union acpi_parse_object *prev = NULL;
 720         union acpi_parse_object *field;
 721         u32 subop;
 722         acpi_status status = AE_OK;
 723
 724         ACPI_FUNCTION_TRACE_PTR(ps_get_next_arg, parser_state);
 725
 726         ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 727                           "Expected argument type ARGP: %s (%2.2X)\n",
 728                           acpi_ut_get_argument_type_name(arg_type), arg_type));
 729
 730         switch (arg_type) {
 731         case ARGP_BYTEDATA:
 732         case ARGP_WORDDATA:
 733         case ARGP_DWORDDATA:
 734         case ARGP_CHARLIST:
 735         case ARGP_NAME:
 736         case ARGP_NAMESTRING:
 737
 738                 /* Constants, strings, and namestrings are all the same size */
 739
 740                 arg = acpi_ps_alloc_op(AML_BYTE_OP, parser_state->aml);
 741                 if (!arg) {
 742                         return_ACPI_STATUS(AE_NO_MEMORY);
 743                 }
 744
 745                 acpi_ps_get_next_simple_arg(parser_state, arg_type, arg);
 746                 break;
 747
 748         case ARGP_PKGLENGTH:
 749
 750                 /* Package length, nothing returned */
 751
 752                 parser_state->pkg_end =
 753                     acpi_ps_get_next_package_end(parser_state);
 754                 break;
 755
 756         case ARGP_FIELDLIST:
 757
 758                 if (parser_state->aml < parser_state->pkg_end) {
 759
 760                         /* Non-empty list */
 761
 762                         while (parser_state->aml < parser_state->pkg_end) {
 763                                 field = acpi_ps_get_next_field(parser_state);
 764                                 if (!field) {
 765                                         return_ACPI_STATUS(AE_NO_MEMORY);
 766                                 }
 767
 768                                 if (prev) {
 769                                         prev->common.next = field;
 770                                 } else {
 771                                         arg = field;
 772                                 }
 773                                 prev = field;
 774                         }
 775
 776                         /* Skip to End of byte data */
 777
 778                         parser_state->aml = parser_state->pkg_end;
 779                 }
 780                 break;
 781
 782         case ARGP_BYTELIST:
 783
 784                 if (parser_state->aml < parser_state->pkg_end) {
 785
 786                         /* Non-empty list */
 787
 788                         arg = acpi_ps_alloc_op(AML_INT_BYTELIST_OP,
 789                                                parser_state->aml);
 790                         if (!arg) {
 791                                 return_ACPI_STATUS(AE_NO_MEMORY);
 792                         }
 793
 794                         /* Fill in bytelist data */
 795
 796                         arg->common.value.size = (u32)
 797                             ACPI_PTR_DIFF(parser_state->pkg_end,
 798                                           parser_state->aml);
 799                         arg->named.data = parser_state->aml;
 800
 801                         /* Skip to End of byte data */
 802
 803                         parser_state->aml = parser_state->pkg_end;
 804                 }
 805                 break;
 806
 807         case ARGP_SIMPLENAME:
 808         case ARGP_NAME_OR_REF:
 809
 810                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 811                                   "**** SimpleName/NameOrRef: %s (%2.2X)\n",
 812                                   acpi_ut_get_argument_type_name(arg_type),
 813                                   arg_type));
 814
 815                 subop = acpi_ps_peek_opcode(parser_state);
 816                 if (subop == 0 ||
 817                     acpi_ps_is_leading_char(subop) ||
 818                     ACPI_IS_ROOT_PREFIX(subop) ||
 819                     ACPI_IS_PARENT_PREFIX(subop)) {
 820
 821                         /* null_name or name_string */
 822
 823                         arg =
 824                             acpi_ps_alloc_op(AML_INT_NAMEPATH_OP,
 825                                              parser_state->aml);
 826                         if (!arg) {
 827                                 return_ACPI_STATUS(AE_NO_MEMORY);
 828                         }
 829
 830                         status =
 831                             acpi_ps_get_next_namepath(walk_state, parser_state,
 832                                                       arg,
 833                                                       ACPI_NOT_METHOD_CALL);
 834                 } else {
 835                         /* Single complex argument, nothing returned */
 836
 837                         walk_state->arg_count = 1;
 838                 }
 839                 break;
 840
 841         case ARGP_TARGET:
 842         case ARGP_SUPERNAME:
 843
 844                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 845                                   "**** Target/Supername: %s (%2.2X)\n",
 846                                   acpi_ut_get_argument_type_name(arg_type),
 847                                   arg_type));
 848
 849                 subop = acpi_ps_peek_opcode(parser_state);
 850                 if (subop == 0 ||
 851                     acpi_ps_is_leading_char(subop) ||
 852                     ACPI_IS_ROOT_PREFIX(subop) ||
 853                     ACPI_IS_PARENT_PREFIX(subop)) {
 854
 855                         /* NULL target (zero). Convert to a NULL namepath */
 856
 857                         arg =
 858                             acpi_ps_alloc_op(AML_INT_NAMEPATH_OP,
 859                                              parser_state->aml);
 860                         if (!arg) {
 861                                 return_ACPI_STATUS(AE_NO_MEMORY);
 862                         }
 863
 864                         status =
 865                             acpi_ps_get_next_namepath(walk_state, parser_state,
 866                                                       arg,
 867                                                       ACPI_POSSIBLE_METHOD_CALL);
 868
 869                         if (arg->common.aml_opcode == AML_INT_METHODCALL_OP) {
 870                                 acpi_ps_free_op(arg);
 871                                 arg = NULL;
 872                                 walk_state->arg_count = 1;
 873                         }
 874                 } else {
 875                         /* Single complex argument, nothing returned */
 876
 877                         walk_state->arg_count = 1;
 878                 }
 879                 break;
 880
 881         case ARGP_DATAOBJ:
 882         case ARGP_TERMARG:
 883
 884                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 885                                   "**** TermArg/DataObj: %s (%2.2X)\n",
 886                                   acpi_ut_get_argument_type_name(arg_type),
 887                                   arg_type));
 888
 889                 /* Single complex argument, nothing returned */
 890
 891                 walk_state->arg_count = 1;
 892                 break;
 893
 894         case ARGP_DATAOBJLIST:
 895         case ARGP_TERMLIST:
 896         case ARGP_OBJLIST:
 897
 898                 if (parser_state->aml < parser_state->pkg_end) {
 899
 900                         /* Non-empty list of variable arguments, nothing returned */
 901
 902                         walk_state->arg_count = ACPI_VAR_ARGS;
 903                 }
 904                 break;
 905
 906         default:
 907
 908                 ACPI_ERROR((AE_INFO, "Invalid ArgType: 0x%X", arg_type));
 909                 status = AE_AML_OPERAND_TYPE;
 910                 break;
 911         }
 912
 913         *return_arg = arg;
 914         return_ACPI_STATUS(status);
 915 }