Revert "ARM: tegra: tegratab: dummy change"
[linux-2.6.git] / drivers / acpi / acpica / psargs.c
1 /******************************************************************************
2  *
3  * Module Name: psargs - Parse AML opcode arguments
4  *
5  *****************************************************************************/
6
7 /*
8  * Copyright (C) 2000 - 2012, 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_ps_is_prefix_char(*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_OP:
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 (walk_state->opcode == AML_UNLOAD_OP) {
273                         /*
274                          * acpi_ps_get_next_namestring has increased the AML pointer,
275                          * so we need to restore the saved AML pointer for method call.
276                          */
277                         walk_state->parser_state.aml = start;
278                         walk_state->arg_count = 1;
279                         acpi_ps_init_op(arg, AML_INT_METHODCALL_OP);
280                         return_ACPI_STATUS(AE_OK);
281                 }
282
283                 /* This name is actually a control method invocation */
284
285                 method_desc = acpi_ns_get_attached_object(node);
286                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
287                                   "Control Method - %p Desc %p Path=%p\n", node,
288                                   method_desc, path));
289
290                 name_op = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP);
291                 if (!name_op) {
292                         return_ACPI_STATUS(AE_NO_MEMORY);
293                 }
294
295                 /* Change Arg into a METHOD CALL and attach name to it */
296
297                 acpi_ps_init_op(arg, AML_INT_METHODCALL_OP);
298                 name_op->common.value.name = path;
299
300                 /* Point METHODCALL/NAME to the METHOD Node */
301
302                 name_op->common.node = node;
303                 acpi_ps_append_arg(arg, name_op);
304
305                 if (!method_desc) {
306                         ACPI_ERROR((AE_INFO,
307                                     "Control Method %p has no attached object",
308                                     node));
309                         return_ACPI_STATUS(AE_AML_INTERNAL);
310                 }
311
312                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
313                                   "Control Method - %p Args %X\n",
314                                   node, method_desc->method.param_count));
315
316                 /* Get the number of arguments to expect */
317
318                 walk_state->arg_count = method_desc->method.param_count;
319                 return_ACPI_STATUS(AE_OK);
320         }
321
322         /*
323          * Special handling if the name was not found during the lookup -
324          * some not_found cases are allowed
325          */
326         if (status == AE_NOT_FOUND) {
327
328                 /* 1) not_found is ok during load pass 1/2 (allow forward references) */
329
330                 if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) !=
331                     ACPI_PARSE_EXECUTE) {
332                         status = AE_OK;
333                 }
334
335                 /* 2) not_found during a cond_ref_of(x) is ok by definition */
336
337                 else if (walk_state->op->common.aml_opcode ==
338                          AML_COND_REF_OF_OP) {
339                         status = AE_OK;
340                 }
341
342                 /*
343                  * 3) not_found while building a Package is ok at this point, we
344                  * may flag as an error later if slack mode is not enabled.
345                  * (Some ASL code depends on allowing this behavior)
346                  */
347                 else if ((arg->common.parent) &&
348                          ((arg->common.parent->common.aml_opcode ==
349                            AML_PACKAGE_OP)
350                           || (arg->common.parent->common.aml_opcode ==
351                               AML_VAR_PACKAGE_OP))) {
352                         status = AE_OK;
353                 }
354         }
355
356         /* Final exception check (may have been changed from code above) */
357
358         if (ACPI_FAILURE(status)) {
359                 ACPI_ERROR_NAMESPACE(path, status);
360
361                 if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) ==
362                     ACPI_PARSE_EXECUTE) {
363
364                         /* Report a control method execution error */
365
366                         status = acpi_ds_method_error(status, walk_state);
367                 }
368         }
369
370         /* Save the namepath */
371
372         arg->common.value.name = path;
373         return_ACPI_STATUS(status);
374 }
375
376 /*******************************************************************************
377  *
378  * FUNCTION:    acpi_ps_get_next_simple_arg
379  *
380  * PARAMETERS:  parser_state        - Current parser state object
381  *              arg_type            - The argument type (AML_*_ARG)
382  *              Arg                 - Where the argument is returned
383  *
384  * RETURN:      None
385  *
386  * DESCRIPTION: Get the next simple argument (constant, string, or namestring)
387  *
388  ******************************************************************************/
389
390 void
391 acpi_ps_get_next_simple_arg(struct acpi_parse_state *parser_state,
392                             u32 arg_type, union acpi_parse_object *arg)
393 {
394         u32 length;
395         u16 opcode;
396         u8 *aml = parser_state->aml;
397
398         ACPI_FUNCTION_TRACE_U32(ps_get_next_simple_arg, arg_type);
399
400         switch (arg_type) {
401         case ARGP_BYTEDATA:
402
403                 /* Get 1 byte from the AML stream */
404
405                 opcode = AML_BYTE_OP;
406                 arg->common.value.integer = (u64) *aml;
407                 length = 1;
408                 break;
409
410         case ARGP_WORDDATA:
411
412                 /* Get 2 bytes from the AML stream */
413
414                 opcode = AML_WORD_OP;
415                 ACPI_MOVE_16_TO_64(&arg->common.value.integer, aml);
416                 length = 2;
417                 break;
418
419         case ARGP_DWORDDATA:
420
421                 /* Get 4 bytes from the AML stream */
422
423                 opcode = AML_DWORD_OP;
424                 ACPI_MOVE_32_TO_64(&arg->common.value.integer, aml);
425                 length = 4;
426                 break;
427
428         case ARGP_QWORDDATA:
429
430                 /* Get 8 bytes from the AML stream */
431
432                 opcode = AML_QWORD_OP;
433                 ACPI_MOVE_64_TO_64(&arg->common.value.integer, aml);
434                 length = 8;
435                 break;
436
437         case ARGP_CHARLIST:
438
439                 /* Get a pointer to the string, point past the string */
440
441                 opcode = AML_STRING_OP;
442                 arg->common.value.string = ACPI_CAST_PTR(char, aml);
443
444                 /* Find the null terminator */
445
446                 length = 0;
447                 while (aml[length]) {
448                         length++;
449                 }
450                 length++;
451                 break;
452
453         case ARGP_NAME:
454         case ARGP_NAMESTRING:
455
456                 acpi_ps_init_op(arg, AML_INT_NAMEPATH_OP);
457                 arg->common.value.name =
458                     acpi_ps_get_next_namestring(parser_state);
459                 return_VOID;
460
461         default:
462
463                 ACPI_ERROR((AE_INFO, "Invalid ArgType 0x%X", arg_type));
464                 return_VOID;
465         }
466
467         acpi_ps_init_op(arg, opcode);
468         parser_state->aml += length;
469         return_VOID;
470 }
471
472 /*******************************************************************************
473  *
474  * FUNCTION:    acpi_ps_get_next_field
475  *
476  * PARAMETERS:  parser_state        - Current parser state object
477  *
478  * RETURN:      A newly allocated FIELD op
479  *
480  * DESCRIPTION: Get next field (named_field, reserved_field, or access_field)
481  *
482  ******************************************************************************/
483
484 static union acpi_parse_object *acpi_ps_get_next_field(struct acpi_parse_state
485                                                        *parser_state)
486 {
487         u32 aml_offset;
488         union acpi_parse_object *field;
489         union acpi_parse_object *arg = NULL;
490         u16 opcode;
491         u32 name;
492         u8 access_type;
493         u8 access_attribute;
494         u8 access_length;
495         u32 pkg_length;
496         u8 *pkg_end;
497         u32 buffer_length;
498
499         ACPI_FUNCTION_TRACE(ps_get_next_field);
500
501         aml_offset =
502             (u32)ACPI_PTR_DIFF(parser_state->aml, parser_state->aml_start);
503
504         /* Determine field type */
505
506         switch (ACPI_GET8(parser_state->aml)) {
507         case AML_FIELD_OFFSET_OP:
508
509                 opcode = AML_INT_RESERVEDFIELD_OP;
510                 parser_state->aml++;
511                 break;
512
513         case AML_FIELD_ACCESS_OP:
514
515                 opcode = AML_INT_ACCESSFIELD_OP;
516                 parser_state->aml++;
517                 break;
518
519         case AML_FIELD_CONNECTION_OP:
520
521                 opcode = AML_INT_CONNECTION_OP;
522                 parser_state->aml++;
523                 break;
524
525         case AML_FIELD_EXT_ACCESS_OP:
526
527                 opcode = AML_INT_EXTACCESSFIELD_OP;
528                 parser_state->aml++;
529                 break;
530
531         default:
532
533                 opcode = AML_INT_NAMEDFIELD_OP;
534                 break;
535         }
536
537         /* Allocate a new field op */
538
539         field = acpi_ps_alloc_op(opcode);
540         if (!field) {
541                 return_PTR(NULL);
542         }
543
544         field->common.aml_offset = aml_offset;
545
546         /* Decode the field type */
547
548         switch (opcode) {
549         case AML_INT_NAMEDFIELD_OP:
550
551                 /* Get the 4-character name */
552
553                 ACPI_MOVE_32_TO_32(&name, parser_state->aml);
554                 acpi_ps_set_name(field, name);
555                 parser_state->aml += ACPI_NAME_SIZE;
556
557                 /* Get the length which is encoded as a package length */
558
559                 field->common.value.size =
560                     acpi_ps_get_next_package_length(parser_state);
561                 break;
562
563         case AML_INT_RESERVEDFIELD_OP:
564
565                 /* Get the length which is encoded as a package length */
566
567                 field->common.value.size =
568                     acpi_ps_get_next_package_length(parser_state);
569                 break;
570
571         case AML_INT_ACCESSFIELD_OP:
572         case AML_INT_EXTACCESSFIELD_OP:
573
574                 /*
575                  * Get access_type and access_attrib and merge into the field Op
576                  * access_type is first operand, access_attribute is second. stuff
577                  * these bytes into the node integer value for convenience.
578                  */
579
580                 /* Get the two bytes (Type/Attribute) */
581
582                 access_type = ACPI_GET8(parser_state->aml);
583                 parser_state->aml++;
584                 access_attribute = ACPI_GET8(parser_state->aml);
585                 parser_state->aml++;
586
587                 field->common.value.integer = (u8)access_type;
588                 field->common.value.integer |= (u16)(access_attribute << 8);
589
590                 /* This opcode has a third byte, access_length */
591
592                 if (opcode == AML_INT_EXTACCESSFIELD_OP) {
593                         access_length = ACPI_GET8(parser_state->aml);
594                         parser_state->aml++;
595
596                         field->common.value.integer |=
597                             (u32)(access_length << 16);
598                 }
599                 break;
600
601         case AML_INT_CONNECTION_OP:
602
603                 /*
604                  * Argument for Connection operator can be either a Buffer
605                  * (resource descriptor), or a name_string.
606                  */
607                 if (ACPI_GET8(parser_state->aml) == AML_BUFFER_OP) {
608                         parser_state->aml++;
609
610                         pkg_end = parser_state->aml;
611                         pkg_length =
612                             acpi_ps_get_next_package_length(parser_state);
613                         pkg_end += pkg_length;
614
615                         if (parser_state->aml < pkg_end) {
616
617                                 /* Non-empty list */
618
619                                 arg = acpi_ps_alloc_op(AML_INT_BYTELIST_OP);
620                                 if (!arg) {
621                                         return_PTR(NULL);
622                                 }
623
624                                 /* Get the actual buffer length argument */
625
626                                 opcode = ACPI_GET8(parser_state->aml);
627                                 parser_state->aml++;
628
629                                 switch (opcode) {
630                                 case AML_BYTE_OP:       /* AML_BYTEDATA_ARG */
631                                         buffer_length =
632                                             ACPI_GET8(parser_state->aml);
633                                         parser_state->aml += 1;
634                                         break;
635
636                                 case AML_WORD_OP:       /* AML_WORDDATA_ARG */
637                                         buffer_length =
638                                             ACPI_GET16(parser_state->aml);
639                                         parser_state->aml += 2;
640                                         break;
641
642                                 case AML_DWORD_OP:      /* AML_DWORDATA_ARG */
643                                         buffer_length =
644                                             ACPI_GET32(parser_state->aml);
645                                         parser_state->aml += 4;
646                                         break;
647
648                                 default:
649                                         buffer_length = 0;
650                                         break;
651                                 }
652
653                                 /* Fill in bytelist data */
654
655                                 arg->named.value.size = buffer_length;
656                                 arg->named.data = parser_state->aml;
657                         }
658
659                         /* Skip to End of byte data */
660
661                         parser_state->aml = pkg_end;
662                 } else {
663                         arg = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP);
664                         if (!arg) {
665                                 return_PTR(NULL);
666                         }
667
668                         /* Get the Namestring argument */
669
670                         arg->common.value.name =
671                             acpi_ps_get_next_namestring(parser_state);
672                 }
673
674                 /* Link the buffer/namestring to parent (CONNECTION_OP) */
675
676                 acpi_ps_append_arg(field, arg);
677                 break;
678
679         default:
680
681                 /* Opcode was set in previous switch */
682                 break;
683         }
684
685         return_PTR(field);
686 }
687
688 /*******************************************************************************
689  *
690  * FUNCTION:    acpi_ps_get_next_arg
691  *
692  * PARAMETERS:  walk_state          - Current state
693  *              parser_state        - Current parser state object
694  *              arg_type            - The argument type (AML_*_ARG)
695  *              return_arg          - Where the next arg is returned
696  *
697  * RETURN:      Status, and an op object containing the next argument.
698  *
699  * DESCRIPTION: Get next argument (including complex list arguments that require
700  *              pushing the parser stack)
701  *
702  ******************************************************************************/
703
704 acpi_status
705 acpi_ps_get_next_arg(struct acpi_walk_state *walk_state,
706                      struct acpi_parse_state *parser_state,
707                      u32 arg_type, union acpi_parse_object **return_arg)
708 {
709         union acpi_parse_object *arg = NULL;
710         union acpi_parse_object *prev = NULL;
711         union acpi_parse_object *field;
712         u32 subop;
713         acpi_status status = AE_OK;
714
715         ACPI_FUNCTION_TRACE_PTR(ps_get_next_arg, parser_state);
716
717         switch (arg_type) {
718         case ARGP_BYTEDATA:
719         case ARGP_WORDDATA:
720         case ARGP_DWORDDATA:
721         case ARGP_CHARLIST:
722         case ARGP_NAME:
723         case ARGP_NAMESTRING:
724
725                 /* Constants, strings, and namestrings are all the same size */
726
727                 arg = acpi_ps_alloc_op(AML_BYTE_OP);
728                 if (!arg) {
729                         return_ACPI_STATUS(AE_NO_MEMORY);
730                 }
731                 acpi_ps_get_next_simple_arg(parser_state, arg_type, arg);
732                 break;
733
734         case ARGP_PKGLENGTH:
735
736                 /* Package length, nothing returned */
737
738                 parser_state->pkg_end =
739                     acpi_ps_get_next_package_end(parser_state);
740                 break;
741
742         case ARGP_FIELDLIST:
743
744                 if (parser_state->aml < parser_state->pkg_end) {
745
746                         /* Non-empty list */
747
748                         while (parser_state->aml < parser_state->pkg_end) {
749                                 field = acpi_ps_get_next_field(parser_state);
750                                 if (!field) {
751                                         return_ACPI_STATUS(AE_NO_MEMORY);
752                                 }
753
754                                 if (prev) {
755                                         prev->common.next = field;
756                                 } else {
757                                         arg = field;
758                                 }
759                                 prev = field;
760                         }
761
762                         /* Skip to End of byte data */
763
764                         parser_state->aml = parser_state->pkg_end;
765                 }
766                 break;
767
768         case ARGP_BYTELIST:
769
770                 if (parser_state->aml < parser_state->pkg_end) {
771
772                         /* Non-empty list */
773
774                         arg = acpi_ps_alloc_op(AML_INT_BYTELIST_OP);
775                         if (!arg) {
776                                 return_ACPI_STATUS(AE_NO_MEMORY);
777                         }
778
779                         /* Fill in bytelist data */
780
781                         arg->common.value.size = (u32)
782                             ACPI_PTR_DIFF(parser_state->pkg_end,
783                                           parser_state->aml);
784                         arg->named.data = parser_state->aml;
785
786                         /* Skip to End of byte data */
787
788                         parser_state->aml = parser_state->pkg_end;
789                 }
790                 break;
791
792         case ARGP_TARGET:
793         case ARGP_SUPERNAME:
794         case ARGP_SIMPLENAME:
795
796                 subop = acpi_ps_peek_opcode(parser_state);
797                 if (subop == 0 ||
798                     acpi_ps_is_leading_char(subop) ||
799                     acpi_ps_is_prefix_char(subop)) {
800
801                         /* null_name or name_string */
802
803                         arg = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP);
804                         if (!arg) {
805                                 return_ACPI_STATUS(AE_NO_MEMORY);
806                         }
807
808                         /* To support super_name arg of Unload */
809
810                         if (walk_state->opcode == AML_UNLOAD_OP) {
811                                 status =
812                                     acpi_ps_get_next_namepath(walk_state,
813                                                               parser_state, arg,
814                                                               1);
815
816                                 /*
817                                  * If the super_name arg of Unload is a method call,
818                                  * we have restored the AML pointer, just free this Arg
819                                  */
820                                 if (arg->common.aml_opcode ==
821                                     AML_INT_METHODCALL_OP) {
822                                         acpi_ps_free_op(arg);
823                                         arg = NULL;
824                                 }
825                         } else {
826                                 status =
827                                     acpi_ps_get_next_namepath(walk_state,
828                                                               parser_state, arg,
829                                                               0);
830                         }
831                 } else {
832                         /* Single complex argument, nothing returned */
833
834                         walk_state->arg_count = 1;
835                 }
836                 break;
837
838         case ARGP_DATAOBJ:
839         case ARGP_TERMARG:
840
841                 /* Single complex argument, nothing returned */
842
843                 walk_state->arg_count = 1;
844                 break;
845
846         case ARGP_DATAOBJLIST:
847         case ARGP_TERMLIST:
848         case ARGP_OBJLIST:
849
850                 if (parser_state->aml < parser_state->pkg_end) {
851
852                         /* Non-empty list of variable arguments, nothing returned */
853
854                         walk_state->arg_count = ACPI_VAR_ARGS;
855                 }
856                 break;
857
858         default:
859
860                 ACPI_ERROR((AE_INFO, "Invalid ArgType: 0x%X", arg_type));
861                 status = AE_AML_OPERAND_TYPE;
862                 break;
863         }
864
865         *return_arg = arg;
866         return_ACPI_STATUS(status);
867 }