[ACPI] merge 3549 4320 4485 4588 4980 5483 5651 acpica asus fops pnpacpi branches...
[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 - 2006, R. Byron Moore
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         char *path;
234         union acpi_parse_object *name_op;
235         acpi_status status;
236         union acpi_operand_object *method_desc;
237         struct acpi_namespace_node *node;
238         union acpi_generic_state scope_info;
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         /* Setup search scope info */
253
254         scope_info.scope.node = NULL;
255         node = parser_state->start_node;
256         if (node) {
257                 scope_info.scope.node = node;
258         }
259
260         /*
261          * Lookup the name in the internal namespace. We don't want to add
262          * anything new to the namespace here, however, so we use MODE_EXECUTE.
263          * Allow searching of the parent tree, but don't open a new scope -
264          * we just want to lookup the object (must be mode EXECUTE to perform
265          * the upsearch)
266          */
267         status =
268             acpi_ns_lookup(&scope_info, path, ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
269                            ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE,
270                            NULL, &node);
271
272         /*
273          * If this name is a control method invocation, we must
274          * setup the method call
275          */
276         if (ACPI_SUCCESS(status) &&
277             possible_method_call && (node->type == ACPI_TYPE_METHOD)) {
278                 /* This name is actually a control method invocation */
279
280                 method_desc = acpi_ns_get_attached_object(node);
281                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
282                                   "Control Method - %p Desc %p Path=%p\n", node,
283                                   method_desc, path));
284
285                 name_op = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP);
286                 if (!name_op) {
287                         return_ACPI_STATUS(AE_NO_MEMORY);
288                 }
289
290                 /* Change Arg into a METHOD CALL and attach name to it */
291
292                 acpi_ps_init_op(arg, AML_INT_METHODCALL_OP);
293                 name_op->common.value.name = path;
294
295                 /* Point METHODCALL/NAME to the METHOD Node */
296
297                 name_op->common.node = node;
298                 acpi_ps_append_arg(arg, name_op);
299
300                 if (!method_desc) {
301                         ACPI_REPORT_ERROR(("Control Method %p has no attached object\n", node));
302                         return_ACPI_STATUS(AE_AML_INTERNAL);
303                 }
304
305                 ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
306                                   "Control Method - %p Args %X\n",
307                                   node, method_desc->method.param_count));
308
309                 /* Get the number of arguments to expect */
310
311                 walk_state->arg_count = method_desc->method.param_count;
312                 return_ACPI_STATUS(AE_OK);
313         }
314
315         /*
316          * Special handling if the name was not found during the lookup -
317          * some not_found cases are allowed
318          */
319         if (status == AE_NOT_FOUND) {
320                 /* 1) not_found is ok during load pass 1/2 (allow forward references) */
321
322                 if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) !=
323                     ACPI_PARSE_EXECUTE) {
324                         status = AE_OK;
325                 }
326
327                 /* 2) not_found during a cond_ref_of(x) is ok by definition */
328
329                 else if (walk_state->op->common.aml_opcode ==
330                          AML_COND_REF_OF_OP) {
331                         status = AE_OK;
332                 }
333
334                 /*
335                  * 3) not_found while building a Package is ok at this point, we
336                  * may flag as an error later if slack mode is not enabled.
337                  * (Some ASL code depends on allowing this behavior)
338                  */
339                 else if ((arg->common.parent) &&
340                          ((arg->common.parent->common.aml_opcode ==
341                            AML_PACKAGE_OP)
342                           || (arg->common.parent->common.aml_opcode ==
343                               AML_VAR_PACKAGE_OP))) {
344                         status = AE_OK;
345                 }
346         }
347
348         /* Final exception check (may have been changed from code above) */
349
350         if (ACPI_FAILURE(status)) {
351                 ACPI_REPORT_NSERROR(path, status);
352
353                 if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) ==
354                     ACPI_PARSE_EXECUTE) {
355                         /* Report a control method execution error */
356
357                         status = acpi_ds_method_error(status, walk_state);
358                 }
359         }
360
361         /* Save the namepath */
362
363         arg->common.value.name = path;
364         return_ACPI_STATUS(status);
365 }
366
367 /*******************************************************************************
368  *
369  * FUNCTION:    acpi_ps_get_next_simple_arg
370  *
371  * PARAMETERS:  parser_state        - Current parser state object
372  *              arg_type            - The argument type (AML_*_ARG)
373  *              Arg                 - Where the argument is returned
374  *
375  * RETURN:      None
376  *
377  * DESCRIPTION: Get the next simple argument (constant, string, or namestring)
378  *
379  ******************************************************************************/
380
381 void
382 acpi_ps_get_next_simple_arg(struct acpi_parse_state *parser_state,
383                             u32 arg_type, union acpi_parse_object *arg)
384 {
385         u32 length;
386         u16 opcode;
387         u8 *aml = parser_state->aml;
388
389         ACPI_FUNCTION_TRACE_U32("ps_get_next_simple_arg", arg_type);
390
391         switch (arg_type) {
392         case ARGP_BYTEDATA:
393
394                 /* Get 1 byte from the AML stream */
395
396                 opcode = AML_BYTE_OP;
397                 arg->common.value.integer = (acpi_integer) * aml;
398                 length = 1;
399                 break;
400
401         case ARGP_WORDDATA:
402
403                 /* Get 2 bytes from the AML stream */
404
405                 opcode = AML_WORD_OP;
406                 ACPI_MOVE_16_TO_64(&arg->common.value.integer, aml);
407                 length = 2;
408                 break;
409
410         case ARGP_DWORDDATA:
411
412                 /* Get 4 bytes from the AML stream */
413
414                 opcode = AML_DWORD_OP;
415                 ACPI_MOVE_32_TO_64(&arg->common.value.integer, aml);
416                 length = 4;
417                 break;
418
419         case ARGP_QWORDDATA:
420
421                 /* Get 8 bytes from the AML stream */
422
423                 opcode = AML_QWORD_OP;
424                 ACPI_MOVE_64_TO_64(&arg->common.value.integer, aml);
425                 length = 8;
426                 break;
427
428         case ARGP_CHARLIST:
429
430                 /* Get a pointer to the string, point past the string */
431
432                 opcode = AML_STRING_OP;
433                 arg->common.value.string = ACPI_CAST_PTR(char, aml);
434
435                 /* Find the null terminator */
436
437                 length = 0;
438                 while (aml[length]) {
439                         length++;
440                 }
441                 length++;
442                 break;
443
444         case ARGP_NAME:
445         case ARGP_NAMESTRING:
446
447                 acpi_ps_init_op(arg, AML_INT_NAMEPATH_OP);
448                 arg->common.value.name =
449                     acpi_ps_get_next_namestring(parser_state);
450                 return_VOID;
451
452         default:
453
454                 ACPI_REPORT_ERROR(("Invalid arg_type %X\n", arg_type));
455                 return_VOID;
456         }
457
458         acpi_ps_init_op(arg, opcode);
459         parser_state->aml += length;
460         return_VOID;
461 }
462
463 /*******************************************************************************
464  *
465  * FUNCTION:    acpi_ps_get_next_field
466  *
467  * PARAMETERS:  parser_state        - Current parser state object
468  *
469  * RETURN:      A newly allocated FIELD op
470  *
471  * DESCRIPTION: Get next field (named_field, reserved_field, or access_field)
472  *
473  ******************************************************************************/
474
475 static union acpi_parse_object *acpi_ps_get_next_field(struct acpi_parse_state
476                                                        *parser_state)
477 {
478         u32 aml_offset = (u32)
479             ACPI_PTR_DIFF(parser_state->aml,
480                           parser_state->aml_start);
481         union acpi_parse_object *field;
482         u16 opcode;
483         u32 name;
484
485         ACPI_FUNCTION_TRACE("ps_get_next_field");
486
487         /* Determine field type */
488
489         switch (ACPI_GET8(parser_state->aml)) {
490         default:
491
492                 opcode = AML_INT_NAMEDFIELD_OP;
493                 break;
494
495         case 0x00:
496
497                 opcode = AML_INT_RESERVEDFIELD_OP;
498                 parser_state->aml++;
499                 break;
500
501         case 0x01:
502
503                 opcode = AML_INT_ACCESSFIELD_OP;
504                 parser_state->aml++;
505                 break;
506         }
507
508         /* Allocate a new field op */
509
510         field = acpi_ps_alloc_op(opcode);
511         if (!field) {
512                 return_PTR(NULL);
513         }
514
515         field->common.aml_offset = aml_offset;
516
517         /* Decode the field type */
518
519         switch (opcode) {
520         case AML_INT_NAMEDFIELD_OP:
521
522                 /* Get the 4-character name */
523
524                 ACPI_MOVE_32_TO_32(&name, parser_state->aml);
525                 acpi_ps_set_name(field, name);
526                 parser_state->aml += ACPI_NAME_SIZE;
527
528                 /* Get the length which is encoded as a package length */
529
530                 field->common.value.size =
531                     acpi_ps_get_next_package_length(parser_state);
532                 break;
533
534         case AML_INT_RESERVEDFIELD_OP:
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_ACCESSFIELD_OP:
543
544                 /*
545                  * Get access_type and access_attrib and merge into the field Op
546                  * access_type is first operand, access_attribute is second
547                  */
548                 field->common.value.integer =
549                     (((u32) ACPI_GET8(parser_state->aml) << 8));
550                 parser_state->aml++;
551                 field->common.value.integer |= ACPI_GET8(parser_state->aml);
552                 parser_state->aml++;
553                 break;
554
555         default:
556
557                 /* Opcode was set in previous switch */
558                 break;
559         }
560
561         return_PTR(field);
562 }
563
564 /*******************************************************************************
565  *
566  * FUNCTION:    acpi_ps_get_next_arg
567  *
568  * PARAMETERS:  walk_state          - Current state
569  *              parser_state        - Current parser state object
570  *              arg_type            - The argument type (AML_*_ARG)
571  *              return_arg          - Where the next arg is returned
572  *
573  * RETURN:      Status, and an op object containing the next argument.
574  *
575  * DESCRIPTION: Get next argument (including complex list arguments that require
576  *              pushing the parser stack)
577  *
578  ******************************************************************************/
579
580 acpi_status
581 acpi_ps_get_next_arg(struct acpi_walk_state *walk_state,
582                      struct acpi_parse_state *parser_state,
583                      u32 arg_type, union acpi_parse_object **return_arg)
584 {
585         union acpi_parse_object *arg = NULL;
586         union acpi_parse_object *prev = NULL;
587         union acpi_parse_object *field;
588         u32 subop;
589         acpi_status status = AE_OK;
590
591         ACPI_FUNCTION_TRACE_PTR("ps_get_next_arg", parser_state);
592
593         switch (arg_type) {
594         case ARGP_BYTEDATA:
595         case ARGP_WORDDATA:
596         case ARGP_DWORDDATA:
597         case ARGP_CHARLIST:
598         case ARGP_NAME:
599         case ARGP_NAMESTRING:
600
601                 /* Constants, strings, and namestrings are all the same size */
602
603                 arg = acpi_ps_alloc_op(AML_BYTE_OP);
604                 if (!arg) {
605                         return_ACPI_STATUS(AE_NO_MEMORY);
606                 }
607                 acpi_ps_get_next_simple_arg(parser_state, arg_type, arg);
608                 break;
609
610         case ARGP_PKGLENGTH:
611
612                 /* Package length, nothing returned */
613
614                 parser_state->pkg_end =
615                     acpi_ps_get_next_package_end(parser_state);
616                 break;
617
618         case ARGP_FIELDLIST:
619
620                 if (parser_state->aml < parser_state->pkg_end) {
621                         /* Non-empty list */
622
623                         while (parser_state->aml < parser_state->pkg_end) {
624                                 field = acpi_ps_get_next_field(parser_state);
625                                 if (!field) {
626                                         return_ACPI_STATUS(AE_NO_MEMORY);
627                                 }
628
629                                 if (prev) {
630                                         prev->common.next = field;
631                                 } else {
632                                         arg = field;
633                                 }
634                                 prev = field;
635                         }
636
637                         /* Skip to End of byte data */
638
639                         parser_state->aml = parser_state->pkg_end;
640                 }
641                 break;
642
643         case ARGP_BYTELIST:
644
645                 if (parser_state->aml < parser_state->pkg_end) {
646                         /* Non-empty list */
647
648                         arg = acpi_ps_alloc_op(AML_INT_BYTELIST_OP);
649                         if (!arg) {
650                                 return_ACPI_STATUS(AE_NO_MEMORY);
651                         }
652
653                         /* Fill in bytelist data */
654
655                         arg->common.value.size = (u32)
656                             ACPI_PTR_DIFF(parser_state->pkg_end,
657                                           parser_state->aml);
658                         arg->named.data = parser_state->aml;
659
660                         /* Skip to End of byte data */
661
662                         parser_state->aml = parser_state->pkg_end;
663                 }
664                 break;
665
666         case ARGP_TARGET:
667         case ARGP_SUPERNAME:
668         case ARGP_SIMPLENAME:
669
670                 subop = acpi_ps_peek_opcode(parser_state);
671                 if (subop == 0 ||
672                     acpi_ps_is_leading_char(subop) ||
673                     acpi_ps_is_prefix_char(subop)) {
674                         /* null_name or name_string */
675
676                         arg = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP);
677                         if (!arg) {
678                                 return_ACPI_STATUS(AE_NO_MEMORY);
679                         }
680
681                         status =
682                             acpi_ps_get_next_namepath(walk_state, parser_state,
683                                                       arg, 0);
684                 } else {
685                         /* Single complex argument, nothing returned */
686
687                         walk_state->arg_count = 1;
688                 }
689                 break;
690
691         case ARGP_DATAOBJ:
692         case ARGP_TERMARG:
693
694                 /* Single complex argument, nothing returned */
695
696                 walk_state->arg_count = 1;
697                 break;
698
699         case ARGP_DATAOBJLIST:
700         case ARGP_TERMLIST:
701         case ARGP_OBJLIST:
702
703                 if (parser_state->aml < parser_state->pkg_end) {
704                         /* Non-empty list of variable arguments, nothing returned */
705
706                         walk_state->arg_count = ACPI_VAR_ARGS;
707                 }
708                 break;
709
710         default:
711
712                 ACPI_REPORT_ERROR(("Invalid arg_type: %X\n", arg_type));
713                 status = AE_AML_OPERAND_TYPE;
714                 break;
715         }
716
717         *return_arg = arg;
718         return_ACPI_STATUS(status);
719 }