ACPICA: create acpica/ directory
[linux-3.10.git] / drivers / acpi / acpica / exoparg1.c
1
2 /******************************************************************************
3  *
4  * Module Name: exoparg1 - AML execution - opcodes with 1 argument
5  *
6  *****************************************************************************/
7
8 /*
9  * Copyright (C) 2000 - 2008, Intel Corp.
10  * All rights reserved.
11  *
12  * Redistribution and use in source and binary forms, with or without
13  * modification, are permitted provided that the following conditions
14  * are met:
15  * 1. Redistributions of source code must retain the above copyright
16  *    notice, this list of conditions, and the following disclaimer,
17  *    without modification.
18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
19  *    substantially similar to the "NO WARRANTY" disclaimer below
20  *    ("Disclaimer") and any redistribution must be conditioned upon
21  *    including a substantially similar Disclaimer requirement for further
22  *    binary redistribution.
23  * 3. Neither the names of the above-listed copyright holders nor the names
24  *    of any contributors may be used to endorse or promote products derived
25  *    from this software without specific prior written permission.
26  *
27  * Alternatively, this software may be distributed under the terms of the
28  * GNU General Public License ("GPL") version 2 as published by the Free
29  * Software Foundation.
30  *
31  * NO WARRANTY
32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
42  * POSSIBILITY OF SUCH DAMAGES.
43  */
44
45 #include <acpi/acpi.h>
46 #include <acpi/accommon.h>
47 #include <acpi/acparser.h>
48 #include <acpi/acdispat.h>
49 #include <acpi/acinterp.h>
50 #include <acpi/amlcode.h>
51 #include <acpi/acnamesp.h>
52
53 #define _COMPONENT          ACPI_EXECUTER
54 ACPI_MODULE_NAME("exoparg1")
55
56 /*!
57  * Naming convention for AML interpreter execution routines.
58  *
59  * The routines that begin execution of AML opcodes are named with a common
60  * convention based upon the number of arguments, the number of target operands,
61  * and whether or not a value is returned:
62  *
63  *      AcpiExOpcode_xA_yT_zR
64  *
65  * Where:
66  *
67  * xA - ARGUMENTS:    The number of arguments (input operands) that are
68  *                    required for this opcode type (0 through 6 args).
69  * yT - TARGETS:      The number of targets (output operands) that are required
70  *                    for this opcode type (0, 1, or 2 targets).
71  * zR - RETURN VALUE: Indicates whether this opcode type returns a value
72  *                    as the function return (0 or 1).
73  *
74  * The AcpiExOpcode* functions are called via the Dispatcher component with
75  * fully resolved operands.
76 !*/
77 /*******************************************************************************
78  *
79  * FUNCTION:    acpi_ex_opcode_0A_0T_1R
80  *
81  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
82  *
83  * RETURN:      Status
84  *
85  * DESCRIPTION: Execute operator with no operands, one return value
86  *
87  ******************************************************************************/
88 acpi_status acpi_ex_opcode_0A_0T_1R(struct acpi_walk_state *walk_state)
89 {
90         acpi_status status = AE_OK;
91         union acpi_operand_object *return_desc = NULL;
92
93         ACPI_FUNCTION_TRACE_STR(ex_opcode_0A_0T_1R,
94                                 acpi_ps_get_opcode_name(walk_state->opcode));
95
96         /* Examine the AML opcode */
97
98         switch (walk_state->opcode) {
99         case AML_TIMER_OP:      /*  Timer () */
100
101                 /* Create a return object of type Integer */
102
103                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
104                 if (!return_desc) {
105                         status = AE_NO_MEMORY;
106                         goto cleanup;
107                 }
108                 return_desc->integer.value = acpi_os_get_timer();
109                 break;
110
111         default:                /*  Unknown opcode  */
112
113                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
114                             walk_state->opcode));
115                 status = AE_AML_BAD_OPCODE;
116                 break;
117         }
118
119       cleanup:
120
121         /* Delete return object on error */
122
123         if ((ACPI_FAILURE(status)) || walk_state->result_obj) {
124                 acpi_ut_remove_reference(return_desc);
125                 walk_state->result_obj = NULL;
126         } else {
127                 /* Save the return value */
128
129                 walk_state->result_obj = return_desc;
130         }
131
132         return_ACPI_STATUS(status);
133 }
134
135 /*******************************************************************************
136  *
137  * FUNCTION:    acpi_ex_opcode_1A_0T_0R
138  *
139  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
140  *
141  * RETURN:      Status
142  *
143  * DESCRIPTION: Execute Type 1 monadic operator with numeric operand on
144  *              object stack
145  *
146  ******************************************************************************/
147
148 acpi_status acpi_ex_opcode_1A_0T_0R(struct acpi_walk_state *walk_state)
149 {
150         union acpi_operand_object **operand = &walk_state->operands[0];
151         acpi_status status = AE_OK;
152
153         ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_0R,
154                                 acpi_ps_get_opcode_name(walk_state->opcode));
155
156         /* Examine the AML opcode */
157
158         switch (walk_state->opcode) {
159         case AML_RELEASE_OP:    /*  Release (mutex_object) */
160
161                 status = acpi_ex_release_mutex(operand[0], walk_state);
162                 break;
163
164         case AML_RESET_OP:      /*  Reset (event_object) */
165
166                 status = acpi_ex_system_reset_event(operand[0]);
167                 break;
168
169         case AML_SIGNAL_OP:     /*  Signal (event_object) */
170
171                 status = acpi_ex_system_signal_event(operand[0]);
172                 break;
173
174         case AML_SLEEP_OP:      /*  Sleep (msec_time) */
175
176                 status = acpi_ex_system_do_suspend(operand[0]->integer.value);
177                 break;
178
179         case AML_STALL_OP:      /*  Stall (usec_time) */
180
181                 status =
182                     acpi_ex_system_do_stall((u32) operand[0]->integer.value);
183                 break;
184
185         case AML_UNLOAD_OP:     /*  Unload (Handle) */
186
187                 status = acpi_ex_unload_table(operand[0]);
188                 break;
189
190         default:                /*  Unknown opcode  */
191
192                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
193                             walk_state->opcode));
194                 status = AE_AML_BAD_OPCODE;
195                 break;
196         }
197
198         return_ACPI_STATUS(status);
199 }
200
201 /*******************************************************************************
202  *
203  * FUNCTION:    acpi_ex_opcode_1A_1T_0R
204  *
205  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
206  *
207  * RETURN:      Status
208  *
209  * DESCRIPTION: Execute opcode with one argument, one target, and no
210  *              return value.
211  *
212  ******************************************************************************/
213
214 acpi_status acpi_ex_opcode_1A_1T_0R(struct acpi_walk_state *walk_state)
215 {
216         acpi_status status = AE_OK;
217         union acpi_operand_object **operand = &walk_state->operands[0];
218
219         ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_0R,
220                                 acpi_ps_get_opcode_name(walk_state->opcode));
221
222         /* Examine the AML opcode */
223
224         switch (walk_state->opcode) {
225         case AML_LOAD_OP:
226
227                 status = acpi_ex_load_op(operand[0], operand[1], walk_state);
228                 break;
229
230         default:                /* Unknown opcode */
231
232                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
233                             walk_state->opcode));
234                 status = AE_AML_BAD_OPCODE;
235                 goto cleanup;
236         }
237
238       cleanup:
239
240         return_ACPI_STATUS(status);
241 }
242
243 /*******************************************************************************
244  *
245  * FUNCTION:    acpi_ex_opcode_1A_1T_1R
246  *
247  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
248  *
249  * RETURN:      Status
250  *
251  * DESCRIPTION: Execute opcode with one argument, one target, and a
252  *              return value.
253  *
254  ******************************************************************************/
255
256 acpi_status acpi_ex_opcode_1A_1T_1R(struct acpi_walk_state *walk_state)
257 {
258         acpi_status status = AE_OK;
259         union acpi_operand_object **operand = &walk_state->operands[0];
260         union acpi_operand_object *return_desc = NULL;
261         union acpi_operand_object *return_desc2 = NULL;
262         u32 temp32;
263         u32 i;
264         acpi_integer power_of_ten;
265         acpi_integer digit;
266
267         ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_1R,
268                                 acpi_ps_get_opcode_name(walk_state->opcode));
269
270         /* Examine the AML opcode */
271
272         switch (walk_state->opcode) {
273         case AML_BIT_NOT_OP:
274         case AML_FIND_SET_LEFT_BIT_OP:
275         case AML_FIND_SET_RIGHT_BIT_OP:
276         case AML_FROM_BCD_OP:
277         case AML_TO_BCD_OP:
278         case AML_COND_REF_OF_OP:
279
280                 /* Create a return object of type Integer for these opcodes */
281
282                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
283                 if (!return_desc) {
284                         status = AE_NO_MEMORY;
285                         goto cleanup;
286                 }
287
288                 switch (walk_state->opcode) {
289                 case AML_BIT_NOT_OP:    /* Not (Operand, Result)  */
290
291                         return_desc->integer.value = ~operand[0]->integer.value;
292                         break;
293
294                 case AML_FIND_SET_LEFT_BIT_OP:  /* find_set_left_bit (Operand, Result) */
295
296                         return_desc->integer.value = operand[0]->integer.value;
297
298                         /*
299                          * Acpi specification describes Integer type as a little
300                          * endian unsigned value, so this boundary condition is valid.
301                          */
302                         for (temp32 = 0; return_desc->integer.value &&
303                              temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
304                                 return_desc->integer.value >>= 1;
305                         }
306
307                         return_desc->integer.value = temp32;
308                         break;
309
310                 case AML_FIND_SET_RIGHT_BIT_OP: /* find_set_right_bit (Operand, Result) */
311
312                         return_desc->integer.value = operand[0]->integer.value;
313
314                         /*
315                          * The Acpi specification describes Integer type as a little
316                          * endian unsigned value, so this boundary condition is valid.
317                          */
318                         for (temp32 = 0; return_desc->integer.value &&
319                              temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
320                                 return_desc->integer.value <<= 1;
321                         }
322
323                         /* Since the bit position is one-based, subtract from 33 (65) */
324
325                         return_desc->integer.value =
326                             temp32 ==
327                             0 ? 0 : (ACPI_INTEGER_BIT_SIZE + 1) - temp32;
328                         break;
329
330                 case AML_FROM_BCD_OP:   /* from_bcd (BCDValue, Result) */
331
332                         /*
333                          * The 64-bit ACPI integer can hold 16 4-bit BCD characters
334                          * (if table is 32-bit, integer can hold 8 BCD characters)
335                          * Convert each 4-bit BCD value
336                          */
337                         power_of_ten = 1;
338                         return_desc->integer.value = 0;
339                         digit = operand[0]->integer.value;
340
341                         /* Convert each BCD digit (each is one nybble wide) */
342
343                         for (i = 0;
344                              (i < acpi_gbl_integer_nybble_width) && (digit > 0);
345                              i++) {
346
347                                 /* Get the least significant 4-bit BCD digit */
348
349                                 temp32 = ((u32) digit) & 0xF;
350
351                                 /* Check the range of the digit */
352
353                                 if (temp32 > 9) {
354                                         ACPI_ERROR((AE_INFO,
355                                                     "BCD digit too large (not decimal): 0x%X",
356                                                     temp32));
357
358                                         status = AE_AML_NUMERIC_OVERFLOW;
359                                         goto cleanup;
360                                 }
361
362                                 /* Sum the digit into the result with the current power of 10 */
363
364                                 return_desc->integer.value +=
365                                     (((acpi_integer) temp32) * power_of_ten);
366
367                                 /* Shift to next BCD digit */
368
369                                 digit >>= 4;
370
371                                 /* Next power of 10 */
372
373                                 power_of_ten *= 10;
374                         }
375                         break;
376
377                 case AML_TO_BCD_OP:     /* to_bcd (Operand, Result) */
378
379                         return_desc->integer.value = 0;
380                         digit = operand[0]->integer.value;
381
382                         /* Each BCD digit is one nybble wide */
383
384                         for (i = 0;
385                              (i < acpi_gbl_integer_nybble_width) && (digit > 0);
386                              i++) {
387                                 (void)acpi_ut_short_divide(digit, 10, &digit,
388                                                            &temp32);
389
390                                 /*
391                                  * Insert the BCD digit that resides in the
392                                  * remainder from above
393                                  */
394                                 return_desc->integer.value |=
395                                     (((acpi_integer) temp32) << ACPI_MUL_4(i));
396                         }
397
398                         /* Overflow if there is any data left in Digit */
399
400                         if (digit > 0) {
401                                 ACPI_ERROR((AE_INFO,
402                                             "Integer too large to convert to BCD: %8.8X%8.8X",
403                                             ACPI_FORMAT_UINT64(operand[0]->
404                                                                integer.value)));
405                                 status = AE_AML_NUMERIC_OVERFLOW;
406                                 goto cleanup;
407                         }
408                         break;
409
410                 case AML_COND_REF_OF_OP:        /* cond_ref_of (source_object, Result) */
411
412                         /*
413                          * This op is a little strange because the internal return value is
414                          * different than the return value stored in the result descriptor
415                          * (There are really two return values)
416                          */
417                         if ((struct acpi_namespace_node *)operand[0] ==
418                             acpi_gbl_root_node) {
419                                 /*
420                                  * This means that the object does not exist in the namespace,
421                                  * return FALSE
422                                  */
423                                 return_desc->integer.value = 0;
424                                 goto cleanup;
425                         }
426
427                         /* Get the object reference, store it, and remove our reference */
428
429                         status = acpi_ex_get_object_reference(operand[0],
430                                                               &return_desc2,
431                                                               walk_state);
432                         if (ACPI_FAILURE(status)) {
433                                 goto cleanup;
434                         }
435
436                         status =
437                             acpi_ex_store(return_desc2, operand[1], walk_state);
438                         acpi_ut_remove_reference(return_desc2);
439
440                         /* The object exists in the namespace, return TRUE */
441
442                         return_desc->integer.value = ACPI_INTEGER_MAX;
443                         goto cleanup;
444
445                 default:
446                         /* No other opcodes get here */
447                         break;
448                 }
449                 break;
450
451         case AML_STORE_OP:      /* Store (Source, Target) */
452
453                 /*
454                  * A store operand is typically a number, string, buffer or lvalue
455                  * Be careful about deleting the source object,
456                  * since the object itself may have been stored.
457                  */
458                 status = acpi_ex_store(operand[0], operand[1], walk_state);
459                 if (ACPI_FAILURE(status)) {
460                         return_ACPI_STATUS(status);
461                 }
462
463                 /* It is possible that the Store already produced a return object */
464
465                 if (!walk_state->result_obj) {
466                         /*
467                          * Normally, we would remove a reference on the Operand[0]
468                          * parameter; But since it is being used as the internal return
469                          * object (meaning we would normally increment it), the two
470                          * cancel out, and we simply don't do anything.
471                          */
472                         walk_state->result_obj = operand[0];
473                         walk_state->operands[0] = NULL; /* Prevent deletion */
474                 }
475                 return_ACPI_STATUS(status);
476
477                 /*
478                  * ACPI 2.0 Opcodes
479                  */
480         case AML_COPY_OP:       /* Copy (Source, Target) */
481
482                 status =
483                     acpi_ut_copy_iobject_to_iobject(operand[0], &return_desc,
484                                                     walk_state);
485                 break;
486
487         case AML_TO_DECSTRING_OP:       /* to_decimal_string (Data, Result) */
488
489                 status = acpi_ex_convert_to_string(operand[0], &return_desc,
490                                                    ACPI_EXPLICIT_CONVERT_DECIMAL);
491                 if (return_desc == operand[0]) {
492
493                         /* No conversion performed, add ref to handle return value */
494                         acpi_ut_add_reference(return_desc);
495                 }
496                 break;
497
498         case AML_TO_HEXSTRING_OP:       /* to_hex_string (Data, Result) */
499
500                 status = acpi_ex_convert_to_string(operand[0], &return_desc,
501                                                    ACPI_EXPLICIT_CONVERT_HEX);
502                 if (return_desc == operand[0]) {
503
504                         /* No conversion performed, add ref to handle return value */
505                         acpi_ut_add_reference(return_desc);
506                 }
507                 break;
508
509         case AML_TO_BUFFER_OP:  /* to_buffer (Data, Result) */
510
511                 status = acpi_ex_convert_to_buffer(operand[0], &return_desc);
512                 if (return_desc == operand[0]) {
513
514                         /* No conversion performed, add ref to handle return value */
515                         acpi_ut_add_reference(return_desc);
516                 }
517                 break;
518
519         case AML_TO_INTEGER_OP: /* to_integer (Data, Result) */
520
521                 status = acpi_ex_convert_to_integer(operand[0], &return_desc,
522                                                     ACPI_ANY_BASE);
523                 if (return_desc == operand[0]) {
524
525                         /* No conversion performed, add ref to handle return value */
526                         acpi_ut_add_reference(return_desc);
527                 }
528                 break;
529
530         case AML_SHIFT_LEFT_BIT_OP:     /* shift_left_bit (Source, bit_num) */
531         case AML_SHIFT_RIGHT_BIT_OP:    /* shift_right_bit (Source, bit_num) */
532
533                 /* These are two obsolete opcodes */
534
535                 ACPI_ERROR((AE_INFO,
536                             "%s is obsolete and not implemented",
537                             acpi_ps_get_opcode_name(walk_state->opcode)));
538                 status = AE_SUPPORT;
539                 goto cleanup;
540
541         default:                /* Unknown opcode */
542
543                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
544                             walk_state->opcode));
545                 status = AE_AML_BAD_OPCODE;
546                 goto cleanup;
547         }
548
549         if (ACPI_SUCCESS(status)) {
550
551                 /* Store the return value computed above into the target object */
552
553                 status = acpi_ex_store(return_desc, operand[1], walk_state);
554         }
555
556       cleanup:
557
558         /* Delete return object on error */
559
560         if (ACPI_FAILURE(status)) {
561                 acpi_ut_remove_reference(return_desc);
562         }
563
564         /* Save return object on success */
565
566         else if (!walk_state->result_obj) {
567                 walk_state->result_obj = return_desc;
568         }
569
570         return_ACPI_STATUS(status);
571 }
572
573 /*******************************************************************************
574  *
575  * FUNCTION:    acpi_ex_opcode_1A_0T_1R
576  *
577  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
578  *
579  * RETURN:      Status
580  *
581  * DESCRIPTION: Execute opcode with one argument, no target, and a return value
582  *
583  ******************************************************************************/
584
585 acpi_status acpi_ex_opcode_1A_0T_1R(struct acpi_walk_state *walk_state)
586 {
587         union acpi_operand_object **operand = &walk_state->operands[0];
588         union acpi_operand_object *temp_desc;
589         union acpi_operand_object *return_desc = NULL;
590         acpi_status status = AE_OK;
591         u32 type;
592         acpi_integer value;
593
594         ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_1R,
595                                 acpi_ps_get_opcode_name(walk_state->opcode));
596
597         /* Examine the AML opcode */
598
599         switch (walk_state->opcode) {
600         case AML_LNOT_OP:       /* LNot (Operand) */
601
602                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
603                 if (!return_desc) {
604                         status = AE_NO_MEMORY;
605                         goto cleanup;
606                 }
607
608                 /*
609                  * Set result to ONES (TRUE) if Value == 0.  Note:
610                  * return_desc->Integer.Value is initially == 0 (FALSE) from above.
611                  */
612                 if (!operand[0]->integer.value) {
613                         return_desc->integer.value = ACPI_INTEGER_MAX;
614                 }
615                 break;
616
617         case AML_DECREMENT_OP:  /* Decrement (Operand)  */
618         case AML_INCREMENT_OP:  /* Increment (Operand)  */
619
620                 /*
621                  * Create a new integer.  Can't just get the base integer and
622                  * increment it because it may be an Arg or Field.
623                  */
624                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
625                 if (!return_desc) {
626                         status = AE_NO_MEMORY;
627                         goto cleanup;
628                 }
629
630                 /*
631                  * Since we are expecting a Reference operand, it can be either a
632                  * NS Node or an internal object.
633                  */
634                 temp_desc = operand[0];
635                 if (ACPI_GET_DESCRIPTOR_TYPE(temp_desc) ==
636                     ACPI_DESC_TYPE_OPERAND) {
637
638                         /* Internal reference object - prevent deletion */
639
640                         acpi_ut_add_reference(temp_desc);
641                 }
642
643                 /*
644                  * Convert the Reference operand to an Integer (This removes a
645                  * reference on the Operand[0] object)
646                  *
647                  * NOTE:  We use LNOT_OP here in order to force resolution of the
648                  * reference operand to an actual integer.
649                  */
650                 status =
651                     acpi_ex_resolve_operands(AML_LNOT_OP, &temp_desc,
652                                              walk_state);
653                 if (ACPI_FAILURE(status)) {
654                         ACPI_EXCEPTION((AE_INFO, status,
655                                         "While resolving operands for [%s]",
656                                         acpi_ps_get_opcode_name(walk_state->
657                                                                 opcode)));
658
659                         goto cleanup;
660                 }
661
662                 /*
663                  * temp_desc is now guaranteed to be an Integer object --
664                  * Perform the actual increment or decrement
665                  */
666                 if (walk_state->opcode == AML_INCREMENT_OP) {
667                         return_desc->integer.value =
668                             temp_desc->integer.value + 1;
669                 } else {
670                         return_desc->integer.value =
671                             temp_desc->integer.value - 1;
672                 }
673
674                 /* Finished with this Integer object */
675
676                 acpi_ut_remove_reference(temp_desc);
677
678                 /*
679                  * Store the result back (indirectly) through the original
680                  * Reference object
681                  */
682                 status = acpi_ex_store(return_desc, operand[0], walk_state);
683                 break;
684
685         case AML_TYPE_OP:       /* object_type (source_object) */
686
687                 /*
688                  * Note: The operand is not resolved at this point because we want to
689                  * get the associated object, not its value.  For example, we don't
690                  * want to resolve a field_unit to its value, we want the actual
691                  * field_unit object.
692                  */
693
694                 /* Get the type of the base object */
695
696                 status =
697                     acpi_ex_resolve_multiple(walk_state, operand[0], &type,
698                                              NULL);
699                 if (ACPI_FAILURE(status)) {
700                         goto cleanup;
701                 }
702
703                 /* Allocate a descriptor to hold the type. */
704
705                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
706                 if (!return_desc) {
707                         status = AE_NO_MEMORY;
708                         goto cleanup;
709                 }
710
711                 return_desc->integer.value = type;
712                 break;
713
714         case AML_SIZE_OF_OP:    /* size_of (source_object) */
715
716                 /*
717                  * Note: The operand is not resolved at this point because we want to
718                  * get the associated object, not its value.
719                  */
720
721                 /* Get the base object */
722
723                 status = acpi_ex_resolve_multiple(walk_state,
724                                                   operand[0], &type,
725                                                   &temp_desc);
726                 if (ACPI_FAILURE(status)) {
727                         goto cleanup;
728                 }
729
730                 /*
731                  * The type of the base object must be integer, buffer, string, or
732                  * package.  All others are not supported.
733                  *
734                  * NOTE: Integer is not specifically supported by the ACPI spec,
735                  * but is supported implicitly via implicit operand conversion.
736                  * rather than bother with conversion, we just use the byte width
737                  * global (4 or 8 bytes).
738                  */
739                 switch (type) {
740                 case ACPI_TYPE_INTEGER:
741                         value = acpi_gbl_integer_byte_width;
742                         break;
743
744                 case ACPI_TYPE_STRING:
745                         value = temp_desc->string.length;
746                         break;
747
748                 case ACPI_TYPE_BUFFER:
749
750                         /* Buffer arguments may not be evaluated at this point */
751
752                         status = acpi_ds_get_buffer_arguments(temp_desc);
753                         value = temp_desc->buffer.length;
754                         break;
755
756                 case ACPI_TYPE_PACKAGE:
757
758                         /* Package arguments may not be evaluated at this point */
759
760                         status = acpi_ds_get_package_arguments(temp_desc);
761                         value = temp_desc->package.count;
762                         break;
763
764                 default:
765                         ACPI_ERROR((AE_INFO,
766                                     "Operand must be Buffer/Integer/String/Package - found type %s",
767                                     acpi_ut_get_type_name(type)));
768                         status = AE_AML_OPERAND_TYPE;
769                         goto cleanup;
770                 }
771
772                 if (ACPI_FAILURE(status)) {
773                         goto cleanup;
774                 }
775
776                 /*
777                  * Now that we have the size of the object, create a result
778                  * object to hold the value
779                  */
780                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
781                 if (!return_desc) {
782                         status = AE_NO_MEMORY;
783                         goto cleanup;
784                 }
785
786                 return_desc->integer.value = value;
787                 break;
788
789         case AML_REF_OF_OP:     /* ref_of (source_object) */
790
791                 status =
792                     acpi_ex_get_object_reference(operand[0], &return_desc,
793                                                  walk_state);
794                 if (ACPI_FAILURE(status)) {
795                         goto cleanup;
796                 }
797                 break;
798
799         case AML_DEREF_OF_OP:   /* deref_of (obj_reference | String) */
800
801                 /* Check for a method local or argument, or standalone String */
802
803                 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
804                     ACPI_DESC_TYPE_NAMED) {
805                         temp_desc =
806                             acpi_ns_get_attached_object((struct
807                                                          acpi_namespace_node *)
808                                                         operand[0]);
809                         if (temp_desc
810                             &&
811                             ((ACPI_GET_OBJECT_TYPE(temp_desc) ==
812                               ACPI_TYPE_STRING)
813                              || (ACPI_GET_OBJECT_TYPE(temp_desc) ==
814                                  ACPI_TYPE_LOCAL_REFERENCE))) {
815                                 operand[0] = temp_desc;
816                                 acpi_ut_add_reference(temp_desc);
817                         } else {
818                                 status = AE_AML_OPERAND_TYPE;
819                                 goto cleanup;
820                         }
821                 } else {
822                         switch (ACPI_GET_OBJECT_TYPE(operand[0])) {
823                         case ACPI_TYPE_LOCAL_REFERENCE:
824                                 /*
825                                  * This is a deref_of (local_x | arg_x)
826                                  *
827                                  * Must resolve/dereference the local/arg reference first
828                                  */
829                                 switch (operand[0]->reference.class) {
830                                 case ACPI_REFCLASS_LOCAL:
831                                 case ACPI_REFCLASS_ARG:
832
833                                         /* Set Operand[0] to the value of the local/arg */
834
835                                         status =
836                                             acpi_ds_method_data_get_value
837                                             (operand[0]->reference.class,
838                                              operand[0]->reference.value,
839                                              walk_state, &temp_desc);
840                                         if (ACPI_FAILURE(status)) {
841                                                 goto cleanup;
842                                         }
843
844                                         /*
845                                          * Delete our reference to the input object and
846                                          * point to the object just retrieved
847                                          */
848                                         acpi_ut_remove_reference(operand[0]);
849                                         operand[0] = temp_desc;
850                                         break;
851
852                                 case ACPI_REFCLASS_REFOF:
853
854                                         /* Get the object to which the reference refers */
855
856                                         temp_desc =
857                                             operand[0]->reference.object;
858                                         acpi_ut_remove_reference(operand[0]);
859                                         operand[0] = temp_desc;
860                                         break;
861
862                                 default:
863
864                                         /* Must be an Index op - handled below */
865                                         break;
866                                 }
867                                 break;
868
869                         case ACPI_TYPE_STRING:
870                                 break;
871
872                         default:
873                                 status = AE_AML_OPERAND_TYPE;
874                                 goto cleanup;
875                         }
876                 }
877
878                 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) !=
879                     ACPI_DESC_TYPE_NAMED) {
880                         if (ACPI_GET_OBJECT_TYPE(operand[0]) ==
881                             ACPI_TYPE_STRING) {
882                                 /*
883                                  * This is a deref_of (String). The string is a reference
884                                  * to a named ACPI object.
885                                  *
886                                  * 1) Find the owning Node
887                                  * 2) Dereference the node to an actual object. Could be a
888                                  *    Field, so we need to resolve the node to a value.
889                                  */
890                                 status =
891                                     acpi_ns_get_node(walk_state->scope_info->
892                                                      scope.node,
893                                                      operand[0]->string.pointer,
894                                                      ACPI_NS_SEARCH_PARENT,
895                                                      ACPI_CAST_INDIRECT_PTR
896                                                      (struct
897                                                       acpi_namespace_node,
898                                                       &return_desc));
899                                 if (ACPI_FAILURE(status)) {
900                                         goto cleanup;
901                                 }
902
903                                 status =
904                                     acpi_ex_resolve_node_to_value
905                                     (ACPI_CAST_INDIRECT_PTR
906                                      (struct acpi_namespace_node, &return_desc),
907                                      walk_state);
908                                 goto cleanup;
909                         }
910                 }
911
912                 /* Operand[0] may have changed from the code above */
913
914                 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
915                     ACPI_DESC_TYPE_NAMED) {
916                         /*
917                          * This is a deref_of (object_reference)
918                          * Get the actual object from the Node (This is the dereference).
919                          * This case may only happen when a local_x or arg_x is
920                          * dereferenced above.
921                          */
922                         return_desc = acpi_ns_get_attached_object((struct
923                                                                    acpi_namespace_node
924                                                                    *)
925                                                                   operand[0]);
926                         acpi_ut_add_reference(return_desc);
927                 } else {
928                         /*
929                          * This must be a reference object produced by either the
930                          * Index() or ref_of() operator
931                          */
932                         switch (operand[0]->reference.class) {
933                         case ACPI_REFCLASS_INDEX:
934
935                                 /*
936                                  * The target type for the Index operator must be
937                                  * either a Buffer or a Package
938                                  */
939                                 switch (operand[0]->reference.target_type) {
940                                 case ACPI_TYPE_BUFFER_FIELD:
941
942                                         temp_desc =
943                                             operand[0]->reference.object;
944
945                                         /*
946                                          * Create a new object that contains one element of the
947                                          * buffer -- the element pointed to by the index.
948                                          *
949                                          * NOTE: index into a buffer is NOT a pointer to a
950                                          * sub-buffer of the main buffer, it is only a pointer to a
951                                          * single element (byte) of the buffer!
952                                          */
953                                         return_desc =
954                                             acpi_ut_create_internal_object
955                                             (ACPI_TYPE_INTEGER);
956                                         if (!return_desc) {
957                                                 status = AE_NO_MEMORY;
958                                                 goto cleanup;
959                                         }
960
961                                         /*
962                                          * Since we are returning the value of the buffer at the
963                                          * indexed location, we don't need to add an additional
964                                          * reference to the buffer itself.
965                                          */
966                                         return_desc->integer.value =
967                                             temp_desc->buffer.
968                                             pointer[operand[0]->reference.
969                                                     value];
970                                         break;
971
972                                 case ACPI_TYPE_PACKAGE:
973
974                                         /*
975                                          * Return the referenced element of the package.  We must
976                                          * add another reference to the referenced object, however.
977                                          */
978                                         return_desc =
979                                             *(operand[0]->reference.where);
980                                         if (return_desc) {
981                                                 acpi_ut_add_reference
982                                                     (return_desc);
983                                         }
984                                         break;
985
986                                 default:
987
988                                         ACPI_ERROR((AE_INFO,
989                                                     "Unknown Index TargetType %X in reference object %p",
990                                                     operand[0]->reference.
991                                                     target_type, operand[0]));
992                                         status = AE_AML_OPERAND_TYPE;
993                                         goto cleanup;
994                                 }
995                                 break;
996
997                         case ACPI_REFCLASS_REFOF:
998
999                                 return_desc = operand[0]->reference.object;
1000
1001                                 if (ACPI_GET_DESCRIPTOR_TYPE(return_desc) ==
1002                                     ACPI_DESC_TYPE_NAMED) {
1003                                         return_desc =
1004                                             acpi_ns_get_attached_object((struct
1005                                                                          acpi_namespace_node
1006                                                                          *)
1007                                                                         return_desc);
1008                                 }
1009
1010                                 /* Add another reference to the object! */
1011
1012                                 acpi_ut_add_reference(return_desc);
1013                                 break;
1014
1015                         default:
1016                                 ACPI_ERROR((AE_INFO,
1017                                             "Unknown class in reference(%p) - %2.2X",
1018                                             operand[0],
1019                                             operand[0]->reference.class));
1020
1021                                 status = AE_TYPE;
1022                                 goto cleanup;
1023                         }
1024                 }
1025                 break;
1026
1027         default:
1028
1029                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
1030                             walk_state->opcode));
1031                 status = AE_AML_BAD_OPCODE;
1032                 goto cleanup;
1033         }
1034
1035       cleanup:
1036
1037         /* Delete return object on error */
1038
1039         if (ACPI_FAILURE(status)) {
1040                 acpi_ut_remove_reference(return_desc);
1041         }
1042
1043         /* Save return object on success */
1044
1045         else {
1046                 walk_state->result_obj = return_desc;
1047         }
1048
1049         return_ACPI_STATUS(status);
1050 }