Merge branch 'pxa-devel' into pxa
[linux-2.6] / drivers / acpi / parser / psargs.c
1 /******************************************************************************
2  *
3  * Module Name: psargs - Parse AML opcode arguments
4  *
5  *****************************************************************************/
6
7 /*
8  * Copyright (C) 2000 - 2008, 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 <acpi/acparser.h>
46 #include <acpi/amlcode.h>
47 #include <acpi/acnamesp.h>
48 #include <acpi/acdispat.h>
49
50 #define _COMPONENT          ACPI_PARSER
51 ACPI_MODULE_NAME("psargs")
52
53 /* Local prototypes */
54 static u32
55 acpi_ps_get_next_package_length(struct acpi_parse_state *parser_state);
56
57 static union acpi_parse_object *acpi_ps_get_next_field(struct acpi_parse_state
58                                                        *parser_state);
59
60 /*******************************************************************************
61  *
62  * FUNCTION:    acpi_ps_get_next_package_length
63  *
64  * PARAMETERS:  parser_state        - Current parser state object
65  *
66  * RETURN:      Decoded package length. On completion, the AML pointer points
67  *              past the length byte or bytes.
68  *
69  * DESCRIPTION: Decode and return a package length field.
70  *              Note: Largest package length is 28 bits, from ACPI specification
71  *
72  ******************************************************************************/
73
74 static u32
75 acpi_ps_get_next_package_length(struct acpi_parse_state *parser_state)
76 {
77         u8 *aml = parser_state->aml;
78         u32 package_length = 0;
79         acpi_native_uint byte_count;
80         u8 byte_zero_mask = 0x3F;       /* Default [0:5] */
81
82         ACPI_FUNCTION_TRACE(ps_get_next_package_length);
83
84         /*
85          * Byte 0 bits [6:7] contain the number of additional bytes
86          * used to encode the package length, either 0,1,2, or 3
87          */
88         byte_count = (aml[0] >> 6);
89         parser_state->aml += (byte_count + 1);
90
91         /* Get bytes 3, 2, 1 as needed */
92
93         while (byte_count) {
94                 /*
95                  * Final bit positions for the package length bytes:
96                  *      Byte3->[20:27]
97                  *      Byte2->[12:19]
98                  *      Byte1->[04:11]
99                  *      Byte0->[00:03]
100                  */
101                 package_length |= (aml[byte_count] << ((byte_count << 3) - 4));
102
103                 byte_zero_mask = 0x0F;  /* Use bits [0:3] of byte 0 */
104                 byte_count--;
105         }
106
107         /* Byte 0 is a special case, either bits [0:3] or [0:5] are used */
108
109         package_length |= (aml[0] & byte_zero_mask);
110         return_UINT32(package_length);
111 }
112
113 /*******************************************************************************
114  *
115  * FUNCTION:    acpi_ps_get_next_package_end
116  *
117  * PARAMETERS:  parser_state        - Current parser state object
118  *
119  * RETURN:      Pointer to end-of-package +1
120  *
121  * DESCRIPTION: Get next package length and return a pointer past the end of
122  *              the package.  Consumes the package length field
123  *
124  ******************************************************************************/
125
126 u8 *acpi_ps_get_next_package_end(struct acpi_parse_state *parser_state)
127 {
128         u8 *start = parser_state->aml;
129         u32 package_length;
130
131         ACPI_FUNCTION_TRACE(ps_get_next_package_end);
132
133         /* Function below updates parser_state->Aml */
134
135         package_length = acpi_ps_get_next_package_length(parser_state);
136
137         return_PTR(start + package_length);     /* end of package */
138 }
139
140 /*******************************************************************************
141  *
142  * FUNCTION:    acpi_ps_get_next_namestring
143  *
144  * PARAMETERS:  parser_state        - Current parser state object
145  *
146  * RETURN:      Pointer to the start of the name string (pointer points into
147  *              the AML.
148  *
149  * DESCRIPTION: Get next raw namestring within the AML stream.  Handles all name
150  *              prefix characters.  Set parser state to point past the string.
151  *              (Name is consumed from the AML.)
152  *
153  ******************************************************************************/
154
155 char *acpi_ps_get_next_namestring(struct acpi_parse_state *parser_state)
156 {
157         u8 *start = parser_state->aml;
158         u8 *end = parser_state->aml;
159
160         ACPI_FUNCTION_TRACE(ps_get_next_namestring);
161
162         /* Point past any namestring prefix characters (backslash or carat) */
163
164         while (acpi_ps_is_prefix_char(*end)) {
165                 end++;
166         }
167
168         /* Decode the path prefix character */
169
170         switch (*end) {
171         case 0:
172
173                 /* null_name */
174
175                 if (end == start) {
176                         start = NULL;
177                 }
178                 end++;
179                 break;
180
181         case AML_DUAL_NAME_PREFIX:
182
183                 /* Two name segments */
184
185                 end += 1 + (2 * ACPI_NAME_SIZE);
186                 break;
187
188         case AML_MULTI_NAME_PREFIX_OP:
189
190                 /* Multiple name segments, 4 chars each, count in next byte */
191
192                 end += 2 + (*(end + 1) * ACPI_NAME_SIZE);
193                 break;
194
195         default:
196
197                 /* Single name segment */
198
199                 end += ACPI_NAME_SIZE;
200                 break;
201         }
202
203         parser_state->aml = end;
204         return_PTR((char *)start);
205 }
206
207 /*******************************************************************************
208  *
209  * FUNCTION:    acpi_ps_get_next_namepath
210  *
211  * PARAMETERS:  parser_state        - Current parser state object
212  *              Arg                 - Where the namepath will be stored
213  *              arg_count           - If the namepath points to a control method
214  *                                    the method's argument is returned here.
215  *              possible_method_call - Whether the namepath can possibly be the
216  *                                    start of a method call
217  *
218  * RETURN:      Status
219  *
220  * DESCRIPTION: Get next name (if method call, return # of required args).
221  *              Names are looked up in the internal namespace to determine
222  *              if the name represents a control method.  If a method
223  *              is found, the number of arguments to the method is returned.
224  *              This information is critical for parsing to continue correctly.
225  *
226  ******************************************************************************/
227
228 acpi_status
229 acpi_ps_get_next_namepath(struct acpi_walk_state *walk_state,
230                           struct acpi_parse_state *parser_state,
231                           union acpi_parse_object *arg, u8 possible_method_call)
232 {
233         acpi_status status;
234         char *path;
235         union acpi_parse_object *name_op;
236         union acpi_operand_object *method_desc;
237         struct acpi_namespace_node *node;
238         u8 *start = parser_state->aml;
239
240         ACPI_FUNCTION_TRACE(ps_get_next_namepath);
241
242         path = acpi_ps_get_next_namestring(parser_state);
243         acpi_ps_init_op(arg, AML_INT_NAMEPATH_OP);
244
245         /* Null path case is allowed, just exit */
246
247         if (!path) {
248                 arg->common.value.name = path;
249                 return_ACPI_STATUS(AE_OK);
250         }
251
252         /*
253          * Lookup the name in the internal namespace, starting with the current
254          * scope. We don't want to add anything new to the namespace here,
255          * however, so we use MODE_EXECUTE.
256          * Allow searching of the parent tree, but don't open a new scope -
257          * we just want to lookup the object (must be mode EXECUTE to perform
258          * the upsearch)
259          */
260         status = acpi_ns_lookup(walk_state->scope_info, path,
261                                 ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
262                                 ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE,
263                                 NULL, &node);
264
265         /*
266          * If this name is a control method invocation, we must
267          * setup the method call
268          */
269         if (ACPI_SUCCESS(status) &&
270             possible_method_call && (node->type == ACPI_TYPE_METHOD)) {
271                 if (walk_state->opcode == AML_UNLOAD_OP) {
272                         /*
273                          * acpi_ps_get_next_namestring has increased the AML pointer,
274                          * so we need to restore the saved AML pointer for method call.
275                          */
276                         walk_state->parser_state.aml = start;
277                         walk_state->arg_count = 1;
278                         acpi_ps_init_op(arg, AML_INT_METHODCALL_OP);
279                         return_ACPI_STATUS(AE_OK);
280                 }
281
282                 /* This name is actually a control method invocation */
283
284                 method_desc = acpi_ns_get_attached_object(node);
285                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
286                                   "Control Method - %p Desc %p Path=%p\n", node,
287                                   method_desc, path));
288
289                 name_op = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP);
290                 if (!name_op) {
291                         return_ACPI_STATUS(AE_NO_MEMORY);
292                 }
293
294                 /* Change Arg into a METHOD CALL and attach name to it */
295
296                 acpi_ps_init_op(arg, AML_INT_METHODCALL_OP);
297                 name_op->common.value.name = path;
298
299                 /* Point METHODCALL/NAME to the METHOD Node */
300
301                 name_op->common.node = node;
302                 acpi_ps_append_arg(arg, name_op);
303
304                 if (!method_desc) {
305                         ACPI_ERROR((AE_INFO,
306                                     "Control Method %p has no attached object",
307                                     node));
308                         return_ACPI_STATUS(AE_AML_INTERNAL);
309                 }
310
311                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
312                                   "Control Method - %p Args %X\n",
313                                   node, method_desc->method.param_count));
314
315                 /* Get the number of arguments to expect */
316
317                 walk_state->arg_count = method_desc->method.param_count;
318                 return_ACPI_STATUS(AE_OK);
319         }
320
321         /*
322          * Special handling if the name was not found during the lookup -
323          * some not_found cases are allowed
324          */
325         if (status == AE_NOT_FOUND) {
326
327                 /* 1) not_found is ok during load pass 1/2 (allow forward references) */
328
329                 if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) !=
330                     ACPI_PARSE_EXECUTE) {
331                         status = AE_OK;
332                 }
333
334                 /* 2) not_found during a cond_ref_of(x) is ok by definition */
335
336                 else if (walk_state->op->common.aml_opcode ==
337                          AML_COND_REF_OF_OP) {
338                         status = AE_OK;
339                 }
340
341                 /*
342                  * 3) not_found while building a Package is ok at this point, we
343                  * may flag as an error later if slack mode is not enabled.
344                  * (Some ASL code depends on allowing this behavior)
345                  */
346                 else if ((arg->common.parent) &&
347                          ((arg->common.parent->common.aml_opcode ==
348                            AML_PACKAGE_OP)
349                           || (arg->common.parent->common.aml_opcode ==
350                               AML_VAR_PACKAGE_OP))) {
351                         status = AE_OK;
352                 }
353         }
354
355         /* Final exception check (may have been changed from code above) */
356
357         if (ACPI_FAILURE(status)) {
358                 ACPI_ERROR_NAMESPACE(path, status);
359
360                 if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) ==
361                     ACPI_PARSE_EXECUTE) {
362
363                         /* Report a control method execution error */
364
365                         status = acpi_ds_method_error(status, walk_state);
366                 }
367         }
368
369         /* Save the namepath */
370
371         arg->common.value.name = path;
372         return_ACPI_STATUS(status);
373 }
374
375 /*******************************************************************************
376  *
377  * FUNCTION:    acpi_ps_get_next_simple_arg
378  *
379  * PARAMETERS:  parser_state        - Current parser state object
380  *              arg_type            - The argument type (AML_*_ARG)
381  *              Arg                 - Where the argument is returned
382  *
383  * RETURN:      None
384  *
385  * DESCRIPTION: Get the next simple argument (constant, string, or namestring)
386  *
387  ******************************************************************************/
388
389 void
390 acpi_ps_get_next_simple_arg(struct acpi_parse_state *parser_state,
391                             u32 arg_type, union acpi_parse_object *arg)
392 {
393         u32 length;
394         u16 opcode;
395         u8 *aml = parser_state->aml;
396
397         ACPI_FUNCTION_TRACE_U32(ps_get_next_simple_arg, arg_type);
398
399         switch (arg_type) {
400         case ARGP_BYTEDATA:
401
402                 /* Get 1 byte from the AML stream */
403
404                 opcode = AML_BYTE_OP;
405                 arg->common.value.integer = (acpi_integer) * aml;
406                 length = 1;
407                 break;
408
409         case ARGP_WORDDATA:
410
411                 /* Get 2 bytes from the AML stream */
412
413                 opcode = AML_WORD_OP;
414                 ACPI_MOVE_16_TO_64(&arg->common.value.integer, aml);
415                 length = 2;
416                 break;
417
418         case ARGP_DWORDDATA:
419
420                 /* Get 4 bytes from the AML stream */
421
422                 opcode = AML_DWORD_OP;
423                 ACPI_MOVE_32_TO_64(&arg->common.value.integer, aml);
424                 length = 4;
425                 break;
426
427         case ARGP_QWORDDATA:
428
429                 /* Get 8 bytes from the AML stream */
430
431                 opcode = AML_QWORD_OP;
432                 ACPI_MOVE_64_TO_64(&arg->common.value.integer, aml);
433                 length = 8;
434                 break;
435
436         case ARGP_CHARLIST:
437
438                 /* Get a pointer to the string, point past the string */
439
440                 opcode = AML_STRING_OP;
441                 arg->common.value.string = ACPI_CAST_PTR(char, aml);
442
443                 /* Find the null terminator */
444
445                 length = 0;
446                 while (aml[length]) {
447                         length++;
448                 }
449                 length++;
450                 break;
451
452         case ARGP_NAME:
453         case ARGP_NAMESTRING:
454
455                 acpi_ps_init_op(arg, AML_INT_NAMEPATH_OP);
456                 arg->common.value.name =
457                     acpi_ps_get_next_namestring(parser_state);
458                 return_VOID;
459
460         default:
461
462                 ACPI_ERROR((AE_INFO, "Invalid ArgType %X", arg_type));
463                 return_VOID;
464         }
465
466         acpi_ps_init_op(arg, opcode);
467         parser_state->aml += length;
468         return_VOID;
469 }
470
471 /*******************************************************************************
472  *
473  * FUNCTION:    acpi_ps_get_next_field
474  *
475  * PARAMETERS:  parser_state        - Current parser state object
476  *
477  * RETURN:      A newly allocated FIELD op
478  *
479  * DESCRIPTION: Get next field (named_field, reserved_field, or access_field)
480  *
481  ******************************************************************************/
482
483 static union acpi_parse_object *acpi_ps_get_next_field(struct acpi_parse_state
484                                                        *parser_state)
485 {
486         u32 aml_offset = (u32)
487             ACPI_PTR_DIFF(parser_state->aml,
488                           parser_state->aml_start);
489         union acpi_parse_object *field;
490         u16 opcode;
491         u32 name;
492
493         ACPI_FUNCTION_TRACE(ps_get_next_field);
494
495         /* Determine field type */
496
497         switch (ACPI_GET8(parser_state->aml)) {
498         default:
499
500                 opcode = AML_INT_NAMEDFIELD_OP;
501                 break;
502
503         case 0x00:
504
505                 opcode = AML_INT_RESERVEDFIELD_OP;
506                 parser_state->aml++;
507                 break;
508
509         case 0x01:
510
511                 opcode = AML_INT_ACCESSFIELD_OP;
512                 parser_state->aml++;
513                 break;
514         }
515
516         /* Allocate a new field op */
517
518         field = acpi_ps_alloc_op(opcode);
519         if (!field) {
520                 return_PTR(NULL);
521         }
522
523         field->common.aml_offset = aml_offset;
524
525         /* Decode the field type */
526
527         switch (opcode) {
528         case AML_INT_NAMEDFIELD_OP:
529
530                 /* Get the 4-character name */
531
532                 ACPI_MOVE_32_TO_32(&name, parser_state->aml);
533                 acpi_ps_set_name(field, name);
534                 parser_state->aml += ACPI_NAME_SIZE;
535
536                 /* Get the length which is encoded as a package length */
537
538                 field->common.value.size =
539                     acpi_ps_get_next_package_length(parser_state);
540                 break;
541
542         case AML_INT_RESERVEDFIELD_OP:
543
544                 /* Get the length which is encoded as a package length */
545
546                 field->common.value.size =
547                     acpi_ps_get_next_package_length(parser_state);
548                 break;
549
550         case AML_INT_ACCESSFIELD_OP:
551
552                 /*
553                  * Get access_type and access_attrib and merge into the field Op
554                  * access_type is first operand, access_attribute is second
555                  */
556                 field->common.value.integer =
557                     (((u32) ACPI_GET8(parser_state->aml) << 8));
558                 parser_state->aml++;
559                 field->common.value.integer |= ACPI_GET8(parser_state->aml);
560                 parser_state->aml++;
561                 break;
562
563         default:
564
565                 /* Opcode was set in previous switch */
566                 break;
567         }
568
569         return_PTR(field);
570 }
571
572 /*******************************************************************************
573  *
574  * FUNCTION:    acpi_ps_get_next_arg
575  *
576  * PARAMETERS:  walk_state          - Current state
577  *              parser_state        - Current parser state object
578  *              arg_type            - The argument type (AML_*_ARG)
579  *              return_arg          - Where the next arg is returned
580  *
581  * RETURN:      Status, and an op object containing the next argument.
582  *
583  * DESCRIPTION: Get next argument (including complex list arguments that require
584  *              pushing the parser stack)
585  *
586  ******************************************************************************/
587
588 acpi_status
589 acpi_ps_get_next_arg(struct acpi_walk_state *walk_state,
590                      struct acpi_parse_state *parser_state,
591                      u32 arg_type, union acpi_parse_object **return_arg)
592 {
593         union acpi_parse_object *arg = NULL;
594         union acpi_parse_object *prev = NULL;
595         union acpi_parse_object *field;
596         u32 subop;
597         acpi_status status = AE_OK;
598
599         ACPI_FUNCTION_TRACE_PTR(ps_get_next_arg, parser_state);
600
601         switch (arg_type) {
602         case ARGP_BYTEDATA:
603         case ARGP_WORDDATA:
604         case ARGP_DWORDDATA:
605         case ARGP_CHARLIST:
606         case ARGP_NAME:
607         case ARGP_NAMESTRING:
608
609                 /* Constants, strings, and namestrings are all the same size */
610
611                 arg = acpi_ps_alloc_op(AML_BYTE_OP);
612                 if (!arg) {
613                         return_ACPI_STATUS(AE_NO_MEMORY);
614                 }
615                 acpi_ps_get_next_simple_arg(parser_state, arg_type, arg);
616                 break;
617
618         case ARGP_PKGLENGTH:
619
620                 /* Package length, nothing returned */
621
622                 parser_state->pkg_end =
623                     acpi_ps_get_next_package_end(parser_state);
624                 break;
625
626         case ARGP_FIELDLIST:
627
628                 if (parser_state->aml < parser_state->pkg_end) {
629
630                         /* Non-empty list */
631
632                         while (parser_state->aml < parser_state->pkg_end) {
633                                 field = acpi_ps_get_next_field(parser_state);
634                                 if (!field) {
635                                         return_ACPI_STATUS(AE_NO_MEMORY);
636                                 }
637
638                                 if (prev) {
639                                         prev->common.next = field;
640                                 } else {
641                                         arg = field;
642                                 }
643                                 prev = field;
644                         }
645
646                         /* Skip to End of byte data */
647
648                         parser_state->aml = parser_state->pkg_end;
649                 }
650                 break;
651
652         case ARGP_BYTELIST:
653
654                 if (parser_state->aml < parser_state->pkg_end) {
655
656                         /* Non-empty list */
657
658                         arg = acpi_ps_alloc_op(AML_INT_BYTELIST_OP);
659                         if (!arg) {
660                                 return_ACPI_STATUS(AE_NO_MEMORY);
661                         }
662
663                         /* Fill in bytelist data */
664
665                         arg->common.value.size = (u32)
666                             ACPI_PTR_DIFF(parser_state->pkg_end,
667                                           parser_state->aml);
668                         arg->named.data = parser_state->aml;
669
670                         /* Skip to End of byte data */
671
672                         parser_state->aml = parser_state->pkg_end;
673                 }
674                 break;
675
676         case ARGP_TARGET:
677         case ARGP_SUPERNAME:
678         case ARGP_SIMPLENAME:
679
680                 subop = acpi_ps_peek_opcode(parser_state);
681                 if (subop == 0 ||
682                     acpi_ps_is_leading_char(subop) ||
683                     acpi_ps_is_prefix_char(subop)) {
684
685                         /* null_name or name_string */
686
687                         arg = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP);
688                         if (!arg) {
689                                 return_ACPI_STATUS(AE_NO_MEMORY);
690                         }
691
692                         /* To support super_name arg of Unload */
693
694                         if (walk_state->opcode == AML_UNLOAD_OP) {
695                                 status =
696                                     acpi_ps_get_next_namepath(walk_state,
697                                                               parser_state, arg,
698                                                               1);
699
700                                 /*
701                                  * If the super_name arg of Unload is a method call,
702                                  * we have restored the AML pointer, just free this Arg
703                                  */
704                                 if (arg->common.aml_opcode ==
705                                     AML_INT_METHODCALL_OP) {
706                                         acpi_ps_free_op(arg);
707                                         arg = NULL;
708                                 }
709                         } else {
710                                 status =
711                                     acpi_ps_get_next_namepath(walk_state,
712                                                               parser_state, arg,
713                                                               0);
714                         }
715                 } else {
716                         /* Single complex argument, nothing returned */
717
718                         walk_state->arg_count = 1;
719                 }
720                 break;
721
722         case ARGP_DATAOBJ:
723         case ARGP_TERMARG:
724
725                 /* Single complex argument, nothing returned */
726
727                 walk_state->arg_count = 1;
728                 break;
729
730         case ARGP_DATAOBJLIST:
731         case ARGP_TERMLIST:
732         case ARGP_OBJLIST:
733
734                 if (parser_state->aml < parser_state->pkg_end) {
735
736                         /* Non-empty list of variable arguments, nothing returned */
737
738                         walk_state->arg_count = ACPI_VAR_ARGS;
739                 }
740                 break;
741
742         default:
743
744                 ACPI_ERROR((AE_INFO, "Invalid ArgType: %X", arg_type));
745                 status = AE_AML_OPERAND_TYPE;
746                 break;
747         }
748
749         *return_arg = arg;
750         return_ACPI_STATUS(status);
751 }