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 #include "acconvert.h"
  51
  52 #define _COMPONENT          ACPI_PARSER
  53 ACPI_MODULE_NAME("psargs")
  54
  55 /* Local prototypes */
  56 static u32
  57 acpi_ps_get_next_package_length(struct acpi_parse_state *parser_state);
  58
  59 static union acpi_parse_object *acpi_ps_get_next_field(struct acpi_parse_state
  60                                                        *parser_state);
  61
  62 /*******************************************************************************
  63  *
  64  * FUNCTION:    acpi_ps_get_next_package_length
  65  *
  66  * PARAMETERS:  parser_state        - Current parser state object
  67  *
  68  * RETURN:      Decoded package length. On completion, the AML pointer points
  69  *              past the length byte or bytes.
  70  *
  71  * DESCRIPTION: Decode and return a package length field.
  72  *              Note: Largest package length is 28 bits, from ACPI specification
  73  *
  74  ******************************************************************************/
  75
  76 static u32
  77 acpi_ps_get_next_package_length(struct acpi_parse_state *parser_state)
  78 {
  79         u8 *aml = parser_state->aml;
  80         u32 package_length = 0;
  81         u32 byte_count;
  82         u8 byte_zero_mask = 0x3F;       /* Default [0:5] */
  83
  84         ACPI_FUNCTION_TRACE(ps_get_next_package_length);
  85
  86         /*
  87          * Byte 0 bits [6:7] contain the number of additional bytes
  88          * used to encode the package length, either 0,1,2, or 3
  89          */
  90         byte_count = (aml[0] >> 6);
  91         parser_state->aml += ((acpi_size)byte_count + 1);
  92
  93         /* Get bytes 3, 2, 1 as needed */
  94
  95         while (byte_count) {
  96                 /*
  97                  * Final bit positions for the package length bytes:
  98                  *      Byte3->[20:27]
  99                  *      Byte2->[12:19]
 100                  *      Byte1->[04:11]
 101                  *      Byte0->[00:03]
 102                  */
 103                 package_length |= (aml[byte_count] << ((byte_count << 3) - 4));
 104
 105                 byte_zero_mask = 0x0F;  /* Use bits [0:3] of byte 0 */
 106                 byte_count--;
 107         }
 108
 109         /* Byte 0 is a special case, either bits [0:3] or [0:5] are used */
 110
 111         package_length |= (aml[0] & byte_zero_mask);
 112         return_UINT32(package_length);
 113 }
 114
 115 /*******************************************************************************
 116  *
 117  * FUNCTION:    acpi_ps_get_next_package_end
 118  *
 119  * PARAMETERS:  parser_state        - Current parser state object
 120  *
 121  * RETURN:      Pointer to end-of-package +1
 122  *
 123  * DESCRIPTION: Get next package length and return a pointer past the end of
 124  *              the package. Consumes the package length field
 125  *
 126  ******************************************************************************/
 127
 128 u8 *acpi_ps_get_next_package_end(struct acpi_parse_state *parser_state)
 129 {
 130         u8 *start = parser_state->aml;
 131         u32 package_length;
 132
 133         ACPI_FUNCTION_TRACE(ps_get_next_package_end);
 134
 135         /* Function below updates parser_state->Aml */
 136
 137         package_length = acpi_ps_get_next_package_length(parser_state);
 138
 139         return_PTR(start + package_length);     /* end of package */
 140 }
 141
 142 /*******************************************************************************
 143  *
 144  * FUNCTION:    acpi_ps_get_next_namestring
 145  *
 146  * PARAMETERS:  parser_state        - Current parser state object
 147  *
 148  * RETURN:      Pointer to the start of the name string (pointer points into
 149  *              the AML.
 150  *
 151  * DESCRIPTION: Get next raw namestring within the AML stream. Handles all name
 152  *              prefix characters. Set parser state to point past the string.
 153  *              (Name is consumed from the AML.)
 154  *
 155  ******************************************************************************/
 156
 157 char *acpi_ps_get_next_namestring(struct acpi_parse_state *parser_state)
 158 {
 159         u8 *start = parser_state->aml;
 160         u8 *end = parser_state->aml;
 161
 162         ACPI_FUNCTION_TRACE(ps_get_next_namestring);
 163
 164         /* Point past any namestring prefix characters (backslash or carat) */
 165
 166         while (ACPI_IS_ROOT_PREFIX(*end) || ACPI_IS_PARENT_PREFIX(*end)) {
 167                 end++;
 168         }
 169
 170         /* Decode the path prefix character */
 171
 172         switch (*end) {
 173         case 0:
 174
 175                 /* null_name */
 176
 177                 if (end == start) {
 178                         start = NULL;
 179                 }
 180                 end++;
 181                 break;
 182
 183         case AML_DUAL_NAME_PREFIX:
 184
 185                 /* Two name segments */
 186
 187                 end += 1 + (2 * ACPI_NAME_SIZE);
 188                 break;
 189
 190         case AML_MULTI_NAME_PREFIX:
 191
 192                 /* Multiple name segments, 4 chars each, count in next byte */
 193
 194                 end += 2 + (*(end + 1) * ACPI_NAME_SIZE);
 195                 break;
 196
 197         default:
 198
 199                 /* Single name segment */
 200
 201                 end += ACPI_NAME_SIZE;
 202                 break;
 203         }
 204
 205         parser_state->aml = end;
 206         return_PTR((char *)start);
 207 }
 208
 209 /*******************************************************************************
 210  *
 211  * FUNCTION:    acpi_ps_get_next_namepath
 212  *
 213  * PARAMETERS:  parser_state        - Current parser state object
 214  *              arg                 - Where the namepath will be stored
 215  *              arg_count           - If the namepath points to a control method
 216  *                                    the method's argument is returned here.
 217  *              possible_method_call - Whether the namepath can possibly be the
 218  *                                    start of a method call
 219  *
 220  * RETURN:      Status
 221  *
 222  * DESCRIPTION: Get next name (if method call, return # of required args).
 223  *              Names are looked up in the internal namespace to determine
 224  *              if the name represents a control method. If a method
 225  *              is found, the number of arguments to the method is returned.
 226  *              This information is critical for parsing to continue correctly.
 227  *
 228  ******************************************************************************/
 229
 230 acpi_status
 231 acpi_ps_get_next_namepath(struct acpi_walk_state *walk_state,
 232                           struct acpi_parse_state *parser_state,
 233                           union acpi_parse_object *arg, u8 possible_method_call)
 234 {
 235         acpi_status status;
 236         char *path;
 237         union acpi_parse_object *name_op;
 238         union acpi_operand_object *method_desc;
 239         struct acpi_namespace_node *node;
 240         u8 *start = parser_state->aml;
 241
 242         ACPI_FUNCTION_TRACE(ps_get_next_namepath);
 243
 244         path = acpi_ps_get_next_namestring(parser_state);
 245         acpi_ps_init_op(arg, AML_INT_NAMEPATH_OP);
 246
 247         /* Null path case is allowed, just exit */
 248
 249         if (!path) {
 250                 arg->common.value.name = path;
 251                 return_ACPI_STATUS(AE_OK);
 252         }
 253
 254         /*
 255          * Lookup the name in the internal namespace, starting with the current
 256          * scope. We don't want to add anything new to the namespace here,
 257          * however, so we use MODE_EXECUTE.
 258          * Allow searching of the parent tree, but don't open a new scope -
 259          * we just want to lookup the object (must be mode EXECUTE to perform
 260          * the upsearch)
 261          */
 262         status = acpi_ns_lookup(walk_state->scope_info, path,
 263                                 ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
 264                                 ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE,
 265                                 NULL, &node);
 266
 267         /*
 268          * If this name is a control method invocation, we must
 269          * setup the method call
 270          */
 271         if (ACPI_SUCCESS(status) &&
 272             possible_method_call && (node->type == ACPI_TYPE_METHOD)) {
 273                 if ((GET_CURRENT_ARG_TYPE(walk_state->arg_types) ==
 274                      ARGP_SUPERNAME)
 275                     || (GET_CURRENT_ARG_TYPE(walk_state->arg_types) ==
 276                         ARGP_TARGET)) {
 277                         /*
 278                          * acpi_ps_get_next_namestring has increased the AML pointer past
 279                          * the method invocation namestring, so we need to restore the
 280                          * saved AML pointer back to the original method invocation
 281                          * namestring.
 282                          */
 283                         walk_state->parser_state.aml = start;
 284                         walk_state->arg_count = 1;
 285                         acpi_ps_init_op(arg, AML_INT_METHODCALL_OP);
 286                 }
 287
 288                 /* This name is actually a control method invocation */
 289
 290                 method_desc = acpi_ns_get_attached_object(node);
 291                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 292                                   "Control Method invocation %4.4s - %p Desc %p Path=%p\n",
 293                                   node->name.ascii, node, method_desc, path));
 294
 295                 name_op = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP, start);
 296                 if (!name_op) {
 297                         return_ACPI_STATUS(AE_NO_MEMORY);
 298                 }
 299
 300                 /* Change Arg into a METHOD CALL and attach name to it */
 301
 302                 acpi_ps_init_op(arg, AML_INT_METHODCALL_OP);
 303                 name_op->common.value.name = path;
 304
 305                 /* Point METHODCALL/NAME to the METHOD Node */
 306
 307                 name_op->common.node = node;
 308                 acpi_ps_append_arg(arg, name_op);
 309
 310                 if (!method_desc) {
 311                         ACPI_ERROR((AE_INFO,
 312                                     "Control Method %p has no attached object",
 313                                     node));
 314                         return_ACPI_STATUS(AE_AML_INTERNAL);
 315                 }
 316
 317                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 318                                   "Control Method - %p Args %X\n",
 319                                   node, method_desc->method.param_count));
 320
 321                 /* Get the number of arguments to expect */
 322
 323                 walk_state->arg_count = method_desc->method.param_count;
 324                 return_ACPI_STATUS(AE_OK);
 325         }
 326
 327         /*
 328          * Special handling if the name was not found during the lookup -
 329          * some not_found cases are allowed
 330          */
 331         if (status == AE_NOT_FOUND) {
 332
 333                 /* 1) not_found is ok during load pass 1/2 (allow forward references) */
 334
 335                 if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) !=
 336                     ACPI_PARSE_EXECUTE) {
 337                         status = AE_OK;
 338                 }
 339
 340                 /* 2) not_found during a cond_ref_of(x) is ok by definition */
 341
 342                 else if (walk_state->op->common.aml_opcode ==
 343                          AML_CONDITIONAL_REF_OF_OP) {
 344                         status = AE_OK;
 345                 }
 346
 347                 /*
 348                  * 3) not_found while building a Package is ok at this point, we
 349                  * may flag as an error later if slack mode is not enabled.
 350                  * (Some ASL code depends on allowing this behavior)
 351                  */
 352                 else if ((arg->common.parent) &&
 353                          ((arg->common.parent->common.aml_opcode ==
 354                            AML_PACKAGE_OP)
 355                           || (arg->common.parent->common.aml_opcode ==
 356                               AML_VARIABLE_PACKAGE_OP))) {
 357                         status = AE_OK;
 358                 }
 359         }
 360
 361         /* Final exception check (may have been changed from code above) */
 362
 363         if (ACPI_FAILURE(status)) {
 364                 ACPI_ERROR_NAMESPACE(path, status);
 365
 366                 if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) ==
 367                     ACPI_PARSE_EXECUTE) {
 368
 369                         /* Report a control method execution error */
 370
 371                         status = acpi_ds_method_error(status, walk_state);
 372                 }
 373         }
 374
 375         /* Save the namepath */
 376
 377         arg->common.value.name = path;
 378         return_ACPI_STATUS(status);
 379 }
 380
 381 /*******************************************************************************
 382  *
 383  * FUNCTION:    acpi_ps_get_next_simple_arg
 384  *
 385  * PARAMETERS:  parser_state        - Current parser state object
 386  *              arg_type            - The argument type (AML_*_ARG)
 387  *              arg                 - Where the argument is returned
 388  *
 389  * RETURN:      None
 390  *
 391  * DESCRIPTION: Get the next simple argument (constant, string, or namestring)
 392  *
 393  ******************************************************************************/
 394
 395 void
 396 acpi_ps_get_next_simple_arg(struct acpi_parse_state *parser_state,
 397                             u32 arg_type, union acpi_parse_object *arg)
 398 {
 399         u32 length;
 400         u16 opcode;
 401         u8 *aml = parser_state->aml;
 402
 403         ACPI_FUNCTION_TRACE_U32(ps_get_next_simple_arg, arg_type);
 404
 405         switch (arg_type) {
 406         case ARGP_BYTEDATA:
 407
 408                 /* Get 1 byte from the AML stream */
 409
 410                 opcode = AML_BYTE_OP;
 411                 arg->common.value.integer = (u64) *aml;
 412                 length = 1;
 413                 break;
 414
 415         case ARGP_WORDDATA:
 416
 417                 /* Get 2 bytes from the AML stream */
 418
 419                 opcode = AML_WORD_OP;
 420                 ACPI_MOVE_16_TO_64(&arg->common.value.integer, aml);
 421                 length = 2;
 422                 break;
 423
 424         case ARGP_DWORDDATA:
 425
 426                 /* Get 4 bytes from the AML stream */
 427
 428                 opcode = AML_DWORD_OP;
 429                 ACPI_MOVE_32_TO_64(&arg->common.value.integer, aml);
 430                 length = 4;
 431                 break;
 432
 433         case ARGP_QWORDDATA:
 434
 435                 /* Get 8 bytes from the AML stream */
 436
 437                 opcode = AML_QWORD_OP;
 438                 ACPI_MOVE_64_TO_64(&arg->common.value.integer, aml);
 439                 length = 8;
 440                 break;
 441
 442         case ARGP_CHARLIST:
 443
 444                 /* Get a pointer to the string, point past the string */
 445
 446                 opcode = AML_STRING_OP;
 447                 arg->common.value.string = ACPI_CAST_PTR(char, aml);
 448
 449                 /* Find the null terminator */
 450
 451                 length = 0;
 452                 while (aml[length]) {
 453                         length++;
 454                 }
 455                 length++;
 456                 break;
 457
 458         case ARGP_NAME:
 459         case ARGP_NAMESTRING:
 460
 461                 acpi_ps_init_op(arg, AML_INT_NAMEPATH_OP);
 462                 arg->common.value.name =
 463                     acpi_ps_get_next_namestring(parser_state);
 464                 return_VOID;
 465
 466         default:
 467
 468                 ACPI_ERROR((AE_INFO, "Invalid ArgType 0x%X", arg_type));
 469                 return_VOID;
 470         }
 471
 472         acpi_ps_init_op(arg, opcode);
 473         parser_state->aml += length;
 474         return_VOID;
 475 }
 476
 477 /*******************************************************************************
 478  *
 479  * FUNCTION:    acpi_ps_get_next_field
 480  *
 481  * PARAMETERS:  parser_state        - Current parser state object
 482  *
 483  * RETURN:      A newly allocated FIELD op
 484  *
 485  * DESCRIPTION: Get next field (named_field, reserved_field, or access_field)
 486  *
 487  ******************************************************************************/
 488
 489 static union acpi_parse_object *acpi_ps_get_next_field(struct acpi_parse_state
 490                                                        *parser_state)
 491 {
 492         u8 *aml;
 493         union acpi_parse_object *field;
 494         union acpi_parse_object *arg = NULL;
 495         u16 opcode;
 496         u32 name;
 497         u8 access_type;
 498         u8 access_attribute;
 499         u8 access_length;
 500         u32 pkg_length;
 501         u8 *pkg_end;
 502         u32 buffer_length;
 503
 504         ACPI_FUNCTION_TRACE(ps_get_next_field);
 505
 506         ASL_CV_CAPTURE_COMMENTS_ONLY(parser_state);
 507         aml = parser_state->aml;
 508
 509         /* Determine field type */
 510
 511         switch (ACPI_GET8(parser_state->aml)) {
 512         case AML_FIELD_OFFSET_OP:
 513
 514                 opcode = AML_INT_RESERVEDFIELD_OP;
 515                 parser_state->aml++;
 516                 break;
 517
 518         case AML_FIELD_ACCESS_OP:
 519
 520                 opcode = AML_INT_ACCESSFIELD_OP;
 521                 parser_state->aml++;
 522                 break;
 523
 524         case AML_FIELD_CONNECTION_OP:
 525
 526                 opcode = AML_INT_CONNECTION_OP;
 527                 parser_state->aml++;
 528                 break;
 529
 530         case AML_FIELD_EXT_ACCESS_OP:
 531
 532                 opcode = AML_INT_EXTACCESSFIELD_OP;
 533                 parser_state->aml++;
 534                 break;
 535
 536         default:
 537
 538                 opcode = AML_INT_NAMEDFIELD_OP;
 539                 break;
 540         }
 541
 542         /* Allocate a new field op */
 543
 544         field = acpi_ps_alloc_op(opcode, aml);
 545         if (!field) {
 546                 return_PTR(NULL);
 547         }
 548
 549         /* Decode the field type */
 550
 551         ASL_CV_CAPTURE_COMMENTS_ONLY(parser_state);
 552         switch (opcode) {
 553         case AML_INT_NAMEDFIELD_OP:
 554
 555                 /* Get the 4-character name */
 556
 557                 ACPI_MOVE_32_TO_32(&name, parser_state->aml);
 558                 acpi_ps_set_name(field, name);
 559                 parser_state->aml += ACPI_NAME_SIZE;
 560
 561                 ASL_CV_CAPTURE_COMMENTS_ONLY(parser_state);
 562
 563 #ifdef ACPI_ASL_COMPILER
 564                 /*
 565                  * Because the package length isn't represented as a parse tree object,
 566                  * take comments surrounding this and add to the previously created
 567                  * parse node.
 568                  */
 569                 if (field->common.inline_comment) {
 570                         field->common.name_comment =
 571                             field->common.inline_comment;
 572                 }
 573                 field->common.inline_comment = acpi_gbl_current_inline_comment;
 574                 acpi_gbl_current_inline_comment = NULL;
 575 #endif
 576
 577                 /* Get the length which is encoded as a package length */
 578
 579                 field->common.value.size =
 580                     acpi_ps_get_next_package_length(parser_state);
 581                 break;
 582
 583         case AML_INT_RESERVEDFIELD_OP:
 584
 585                 /* Get the length which is encoded as a package length */
 586
 587                 field->common.value.size =
 588                     acpi_ps_get_next_package_length(parser_state);
 589                 break;
 590
 591         case AML_INT_ACCESSFIELD_OP:
 592         case AML_INT_EXTACCESSFIELD_OP:
 593
 594                 /*
 595                  * Get access_type and access_attrib and merge into the field Op
 596                  * access_type is first operand, access_attribute is second. stuff
 597                  * these bytes into the node integer value for convenience.
 598                  */
 599
 600                 /* Get the two bytes (Type/Attribute) */
 601
 602                 access_type = ACPI_GET8(parser_state->aml);
 603                 parser_state->aml++;
 604                 access_attribute = ACPI_GET8(parser_state->aml);
 605                 parser_state->aml++;
 606
 607                 field->common.value.integer = (u8)access_type;
 608                 field->common.value.integer |= (u16)(access_attribute << 8);
 609
 610                 /* This opcode has a third byte, access_length */
 611
 612                 if (opcode == AML_INT_EXTACCESSFIELD_OP) {
 613                         access_length = ACPI_GET8(parser_state->aml);
 614                         parser_state->aml++;
 615
 616                         field->common.value.integer |=
 617                             (u32)(access_length << 16);
 618                 }
 619                 break;
 620
 621         case AML_INT_CONNECTION_OP:
 622
 623                 /*
 624                  * Argument for Connection operator can be either a Buffer
 625                  * (resource descriptor), or a name_string.
 626                  */
 627                 aml = parser_state->aml;
 628                 if (ACPI_GET8(parser_state->aml) == AML_BUFFER_OP) {
 629                         parser_state->aml++;
 630
 631                         ASL_CV_CAPTURE_COMMENTS_ONLY(parser_state);
 632                         pkg_end = parser_state->aml;
 633                         pkg_length =
 634                             acpi_ps_get_next_package_length(parser_state);
 635                         pkg_end += pkg_length;
 636
 637                         ASL_CV_CAPTURE_COMMENTS_ONLY(parser_state);
 638                         if (parser_state->aml < pkg_end) {
 639
 640                                 /* Non-empty list */
 641
 642                                 arg =
 643                                     acpi_ps_alloc_op(AML_INT_BYTELIST_OP, aml);
 644                                 if (!arg) {
 645                                         acpi_ps_free_op(field);
 646                                         return_PTR(NULL);
 647                                 }
 648
 649                                 /* Get the actual buffer length argument */
 650
 651                                 opcode = ACPI_GET8(parser_state->aml);
 652                                 parser_state->aml++;
 653
 654                                 ASL_CV_CAPTURE_COMMENTS_ONLY(parser_state);
 655                                 switch (opcode) {
 656                                 case AML_BYTE_OP:       /* AML_BYTEDATA_ARG */
 657
 658                                         buffer_length =
 659                                             ACPI_GET8(parser_state->aml);
 660                                         parser_state->aml += 1;
 661                                         break;
 662
 663                                 case AML_WORD_OP:       /* AML_WORDDATA_ARG */
 664
 665                                         buffer_length =
 666                                             ACPI_GET16(parser_state->aml);
 667                                         parser_state->aml += 2;
 668                                         break;
 669
 670                                 case AML_DWORD_OP:      /* AML_DWORDATA_ARG */
 671
 672                                         buffer_length =
 673                                             ACPI_GET32(parser_state->aml);
 674                                         parser_state->aml += 4;
 675                                         break;
 676
 677                                 default:
 678
 679                                         buffer_length = 0;
 680                                         break;
 681                                 }
 682
 683                                 /* Fill in bytelist data */
 684
 685                                 ASL_CV_CAPTURE_COMMENTS_ONLY(parser_state);
 686                                 arg->named.value.size = buffer_length;
 687                                 arg->named.data = parser_state->aml;
 688                         }
 689
 690                         /* Skip to End of byte data */
 691
 692                         parser_state->aml = pkg_end;
 693                 } else {
 694                         arg = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP, aml);
 695                         if (!arg) {
 696                                 acpi_ps_free_op(field);
 697                                 return_PTR(NULL);
 698                         }
 699
 700                         /* Get the Namestring argument */
 701
 702                         arg->common.value.name =
 703                             acpi_ps_get_next_namestring(parser_state);
 704                 }
 705
 706                 /* Link the buffer/namestring to parent (CONNECTION_OP) */
 707
 708                 acpi_ps_append_arg(field, arg);
 709                 break;
 710
 711         default:
 712
 713                 /* Opcode was set in previous switch */
 714                 break;
 715         }
 716
 717         return_PTR(field);
 718 }
 719
 720 /*******************************************************************************
 721  *
 722  * FUNCTION:    acpi_ps_get_next_arg
 723  *
 724  * PARAMETERS:  walk_state          - Current state
 725  *              parser_state        - Current parser state object
 726  *              arg_type            - The argument type (AML_*_ARG)
 727  *              return_arg          - Where the next arg is returned
 728  *
 729  * RETURN:      Status, and an op object containing the next argument.
 730  *
 731  * DESCRIPTION: Get next argument (including complex list arguments that require
 732  *              pushing the parser stack)
 733  *
 734  ******************************************************************************/
 735
 736 acpi_status
 737 acpi_ps_get_next_arg(struct acpi_walk_state *walk_state,
 738                      struct acpi_parse_state *parser_state,
 739                      u32 arg_type, union acpi_parse_object **return_arg)
 740 {
 741         union acpi_parse_object *arg = NULL;
 742         union acpi_parse_object *prev = NULL;
 743         union acpi_parse_object *field;
 744         u32 subop;
 745         acpi_status status = AE_OK;
 746
 747         ACPI_FUNCTION_TRACE_PTR(ps_get_next_arg, parser_state);
 748
 749         ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 750                           "Expected argument type ARGP: %s (%2.2X)\n",
 751                           acpi_ut_get_argument_type_name(arg_type), arg_type));
 752
 753         switch (arg_type) {
 754         case ARGP_BYTEDATA:
 755         case ARGP_WORDDATA:
 756         case ARGP_DWORDDATA:
 757         case ARGP_CHARLIST:
 758         case ARGP_NAME:
 759         case ARGP_NAMESTRING:
 760
 761                 /* Constants, strings, and namestrings are all the same size */
 762
 763                 arg = acpi_ps_alloc_op(AML_BYTE_OP, parser_state->aml);
 764                 if (!arg) {
 765                         return_ACPI_STATUS(AE_NO_MEMORY);
 766                 }
 767
 768                 acpi_ps_get_next_simple_arg(parser_state, arg_type, arg);
 769                 break;
 770
 771         case ARGP_PKGLENGTH:
 772
 773                 /* Package length, nothing returned */
 774
 775                 parser_state->pkg_end =
 776                     acpi_ps_get_next_package_end(parser_state);
 777                 break;
 778
 779         case ARGP_FIELDLIST:
 780
 781                 if (parser_state->aml < parser_state->pkg_end) {
 782
 783                         /* Non-empty list */
 784
 785                         while (parser_state->aml < parser_state->pkg_end) {
 786                                 field = acpi_ps_get_next_field(parser_state);
 787                                 if (!field) {
 788                                         return_ACPI_STATUS(AE_NO_MEMORY);
 789                                 }
 790
 791                                 if (prev) {
 792                                         prev->common.next = field;
 793                                 } else {
 794                                         arg = field;
 795                                 }
 796                                 prev = field;
 797                         }
 798
 799                         /* Skip to End of byte data */
 800
 801                         parser_state->aml = parser_state->pkg_end;
 802                 }
 803                 break;
 804
 805         case ARGP_BYTELIST:
 806
 807                 if (parser_state->aml < parser_state->pkg_end) {
 808
 809                         /* Non-empty list */
 810
 811                         arg = acpi_ps_alloc_op(AML_INT_BYTELIST_OP,
 812                                                parser_state->aml);
 813                         if (!arg) {
 814                                 return_ACPI_STATUS(AE_NO_MEMORY);
 815                         }
 816
 817                         /* Fill in bytelist data */
 818
 819                         arg->common.value.size = (u32)
 820                             ACPI_PTR_DIFF(parser_state->pkg_end,
 821                                           parser_state->aml);
 822                         arg->named.data = parser_state->aml;
 823
 824                         /* Skip to End of byte data */
 825
 826                         parser_state->aml = parser_state->pkg_end;
 827                 }
 828                 break;
 829
 830         case ARGP_SIMPLENAME:
 831         case ARGP_NAME_OR_REF:
 832
 833                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 834                                   "**** SimpleName/NameOrRef: %s (%2.2X)\n",
 835                                   acpi_ut_get_argument_type_name(arg_type),
 836                                   arg_type));
 837
 838                 subop = acpi_ps_peek_opcode(parser_state);
 839                 if (subop == 0 ||
 840                     acpi_ps_is_leading_char(subop) ||
 841                     ACPI_IS_ROOT_PREFIX(subop) ||
 842                     ACPI_IS_PARENT_PREFIX(subop)) {
 843
 844                         /* null_name or name_string */
 845
 846                         arg =
 847                             acpi_ps_alloc_op(AML_INT_NAMEPATH_OP,
 848                                              parser_state->aml);
 849                         if (!arg) {
 850                                 return_ACPI_STATUS(AE_NO_MEMORY);
 851                         }
 852
 853                         status =
 854                             acpi_ps_get_next_namepath(walk_state, parser_state,
 855                                                       arg,
 856                                                       ACPI_NOT_METHOD_CALL);
 857                 } else {
 858                         /* Single complex argument, nothing returned */
 859
 860                         walk_state->arg_count = 1;
 861                 }
 862                 break;
 863
 864         case ARGP_TARGET:
 865         case ARGP_SUPERNAME:
 866
 867                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 868                                   "**** Target/Supername: %s (%2.2X)\n",
 869                                   acpi_ut_get_argument_type_name(arg_type),
 870                                   arg_type));
 871
 872                 subop = acpi_ps_peek_opcode(parser_state);
 873                 if (subop == 0 ||
 874                     acpi_ps_is_leading_char(subop) ||
 875                     ACPI_IS_ROOT_PREFIX(subop) ||
 876                     ACPI_IS_PARENT_PREFIX(subop)) {
 877
 878                         /* NULL target (zero). Convert to a NULL namepath */
 879
 880                         arg =
 881                             acpi_ps_alloc_op(AML_INT_NAMEPATH_OP,
 882                                              parser_state->aml);
 883                         if (!arg) {
 884                                 return_ACPI_STATUS(AE_NO_MEMORY);
 885                         }
 886
 887                         status =
 888                             acpi_ps_get_next_namepath(walk_state, parser_state,
 889                                                       arg,
 890                                                       ACPI_POSSIBLE_METHOD_CALL);
 891
 892                         if (arg->common.aml_opcode == AML_INT_METHODCALL_OP) {
 893                                 acpi_ps_free_op(arg);
 894                                 arg = NULL;
 895                                 walk_state->arg_count = 1;
 896                         }
 897                 } else {
 898                         /* Single complex argument, nothing returned */
 899
 900                         walk_state->arg_count = 1;
 901                 }
 902                 break;
 903
 904         case ARGP_DATAOBJ:
 905         case ARGP_TERMARG:
 906
 907                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
 908                                   "**** TermArg/DataObj: %s (%2.2X)\n",
 909                                   acpi_ut_get_argument_type_name(arg_type),
 910                                   arg_type));
 911
 912                 /* Single complex argument, nothing returned */
 913
 914                 walk_state->arg_count = 1;
 915                 break;
 916
 917         case ARGP_DATAOBJLIST:
 918         case ARGP_TERMLIST:
 919         case ARGP_OBJLIST:
 920
 921                 if (parser_state->aml < parser_state->pkg_end) {
 922
 923                         /* Non-empty list of variable arguments, nothing returned */
 924
 925                         walk_state->arg_count = ACPI_VAR_ARGS;
 926                 }
 927                 break;
 928
 929         default:
 930
 931                 ACPI_ERROR((AE_INFO, "Invalid ArgType: 0x%X", arg_type));
 932                 status = AE_AML_OPERAND_TYPE;
 933                 break;
 934         }
 935
 936         *return_arg = arg;
 937         return_ACPI_STATUS(status);
 938 }