Merge branch 'i7300_idle' into test
[linux-2.6] / drivers / acpi / executer / 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/acparser.h>
47 #include <acpi/acdispat.h>
48 #include <acpi/acinterp.h>
49 #include <acpi/amlcode.h>
50 #include <acpi/acnamesp.h>
51
52 #define _COMPONENT          ACPI_EXECUTER
53 ACPI_MODULE_NAME("exoparg1")
54
55 /*!
56  * Naming convention for AML interpreter execution routines.
57  *
58  * The routines that begin execution of AML opcodes are named with a common
59  * convention based upon the number of arguments, the number of target operands,
60  * and whether or not a value is returned:
61  *
62  *      AcpiExOpcode_xA_yT_zR
63  *
64  * Where:
65  *
66  * xA - ARGUMENTS:    The number of arguments (input operands) that are
67  *                    required for this opcode type (0 through 6 args).
68  * yT - TARGETS:      The number of targets (output operands) that are required
69  *                    for this opcode type (0, 1, or 2 targets).
70  * zR - RETURN VALUE: Indicates whether this opcode type returns a value
71  *                    as the function return (0 or 1).
72  *
73  * The AcpiExOpcode* functions are called via the Dispatcher component with
74  * fully resolved operands.
75 !*/
76 /*******************************************************************************
77  *
78  * FUNCTION:    acpi_ex_opcode_0A_0T_1R
79  *
80  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
81  *
82  * RETURN:      Status
83  *
84  * DESCRIPTION: Execute operator with no operands, one return value
85  *
86  ******************************************************************************/
87 acpi_status acpi_ex_opcode_0A_0T_1R(struct acpi_walk_state *walk_state)
88 {
89         acpi_status status = AE_OK;
90         union acpi_operand_object *return_desc = NULL;
91
92         ACPI_FUNCTION_TRACE_STR(ex_opcode_0A_0T_1R,
93                                 acpi_ps_get_opcode_name(walk_state->opcode));
94
95         /* Examine the AML opcode */
96
97         switch (walk_state->opcode) {
98         case AML_TIMER_OP:      /*  Timer () */
99
100                 /* Create a return object of type Integer */
101
102                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
103                 if (!return_desc) {
104                         status = AE_NO_MEMORY;
105                         goto cleanup;
106                 }
107                 return_desc->integer.value = acpi_os_get_timer();
108                 break;
109
110         default:                /*  Unknown opcode  */
111
112                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
113                             walk_state->opcode));
114                 status = AE_AML_BAD_OPCODE;
115                 break;
116         }
117
118       cleanup:
119
120         /* Delete return object on error */
121
122         if ((ACPI_FAILURE(status)) || walk_state->result_obj) {
123                 acpi_ut_remove_reference(return_desc);
124                 walk_state->result_obj = NULL;
125         } else {
126                 /* Save the return value */
127
128                 walk_state->result_obj = return_desc;
129         }
130
131         return_ACPI_STATUS(status);
132 }
133
134 /*******************************************************************************
135  *
136  * FUNCTION:    acpi_ex_opcode_1A_0T_0R
137  *
138  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
139  *
140  * RETURN:      Status
141  *
142  * DESCRIPTION: Execute Type 1 monadic operator with numeric operand on
143  *              object stack
144  *
145  ******************************************************************************/
146
147 acpi_status acpi_ex_opcode_1A_0T_0R(struct acpi_walk_state *walk_state)
148 {
149         union acpi_operand_object **operand = &walk_state->operands[0];
150         acpi_status status = AE_OK;
151
152         ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_0R,
153                                 acpi_ps_get_opcode_name(walk_state->opcode));
154
155         /* Examine the AML opcode */
156
157         switch (walk_state->opcode) {
158         case AML_RELEASE_OP:    /*  Release (mutex_object) */
159
160                 status = acpi_ex_release_mutex(operand[0], walk_state);
161                 break;
162
163         case AML_RESET_OP:      /*  Reset (event_object) */
164
165                 status = acpi_ex_system_reset_event(operand[0]);
166                 break;
167
168         case AML_SIGNAL_OP:     /*  Signal (event_object) */
169
170                 status = acpi_ex_system_signal_event(operand[0]);
171                 break;
172
173         case AML_SLEEP_OP:      /*  Sleep (msec_time) */
174
175                 status = acpi_ex_system_do_suspend(operand[0]->integer.value);
176                 break;
177
178         case AML_STALL_OP:      /*  Stall (usec_time) */
179
180                 status =
181                     acpi_ex_system_do_stall((u32) operand[0]->integer.value);
182                 break;
183
184         case AML_UNLOAD_OP:     /*  Unload (Handle) */
185
186                 status = acpi_ex_unload_table(operand[0]);
187                 break;
188
189         default:                /*  Unknown opcode  */
190
191                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
192                             walk_state->opcode));
193                 status = AE_AML_BAD_OPCODE;
194                 break;
195         }
196
197         return_ACPI_STATUS(status);
198 }
199
200 /*******************************************************************************
201  *
202  * FUNCTION:    acpi_ex_opcode_1A_1T_0R
203  *
204  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
205  *
206  * RETURN:      Status
207  *
208  * DESCRIPTION: Execute opcode with one argument, one target, and no
209  *              return value.
210  *
211  ******************************************************************************/
212
213 acpi_status acpi_ex_opcode_1A_1T_0R(struct acpi_walk_state *walk_state)
214 {
215         acpi_status status = AE_OK;
216         union acpi_operand_object **operand = &walk_state->operands[0];
217
218         ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_0R,
219                                 acpi_ps_get_opcode_name(walk_state->opcode));
220
221         /* Examine the AML opcode */
222
223         switch (walk_state->opcode) {
224         case AML_LOAD_OP:
225
226                 status = acpi_ex_load_op(operand[0], operand[1], walk_state);
227                 break;
228
229         default:                /* Unknown opcode */
230
231                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
232                             walk_state->opcode));
233                 status = AE_AML_BAD_OPCODE;
234                 goto cleanup;
235         }
236
237       cleanup:
238
239         return_ACPI_STATUS(status);
240 }
241
242 /*******************************************************************************
243  *
244  * FUNCTION:    acpi_ex_opcode_1A_1T_1R
245  *
246  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
247  *
248  * RETURN:      Status
249  *
250  * DESCRIPTION: Execute opcode with one argument, one target, and a
251  *              return value.
252  *
253  ******************************************************************************/
254
255 acpi_status acpi_ex_opcode_1A_1T_1R(struct acpi_walk_state *walk_state)
256 {
257         acpi_status status = AE_OK;
258         union acpi_operand_object **operand = &walk_state->operands[0];
259         union acpi_operand_object *return_desc = NULL;
260         union acpi_operand_object *return_desc2 = NULL;
261         u32 temp32;
262         u32 i;
263         acpi_integer power_of_ten;
264         acpi_integer digit;
265
266         ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_1R,
267                                 acpi_ps_get_opcode_name(walk_state->opcode));
268
269         /* Examine the AML opcode */
270
271         switch (walk_state->opcode) {
272         case AML_BIT_NOT_OP:
273         case AML_FIND_SET_LEFT_BIT_OP:
274         case AML_FIND_SET_RIGHT_BIT_OP:
275         case AML_FROM_BCD_OP:
276         case AML_TO_BCD_OP:
277         case AML_COND_REF_OF_OP:
278
279                 /* Create a return object of type Integer for these opcodes */
280
281                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
282                 if (!return_desc) {
283                         status = AE_NO_MEMORY;
284                         goto cleanup;
285                 }
286
287                 switch (walk_state->opcode) {
288                 case AML_BIT_NOT_OP:    /* Not (Operand, Result)  */
289
290                         return_desc->integer.value = ~operand[0]->integer.value;
291                         break;
292
293                 case AML_FIND_SET_LEFT_BIT_OP:  /* find_set_left_bit (Operand, Result) */
294
295                         return_desc->integer.value = operand[0]->integer.value;
296
297                         /*
298                          * Acpi specification describes Integer type as a little
299                          * endian unsigned value, so this boundary condition is valid.
300                          */
301                         for (temp32 = 0; return_desc->integer.value &&
302                              temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
303                                 return_desc->integer.value >>= 1;
304                         }
305
306                         return_desc->integer.value = temp32;
307                         break;
308
309                 case AML_FIND_SET_RIGHT_BIT_OP: /* find_set_right_bit (Operand, Result) */
310
311                         return_desc->integer.value = operand[0]->integer.value;
312
313                         /*
314                          * The Acpi specification describes Integer type as a little
315                          * endian unsigned value, so this boundary condition is valid.
316                          */
317                         for (temp32 = 0; return_desc->integer.value &&
318                              temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
319                                 return_desc->integer.value <<= 1;
320                         }
321
322                         /* Since the bit position is one-based, subtract from 33 (65) */
323
324                         return_desc->integer.value =
325                             temp32 ==
326                             0 ? 0 : (ACPI_INTEGER_BIT_SIZE + 1) - temp32;
327                         break;
328
329                 case AML_FROM_BCD_OP:   /* from_bcd (BCDValue, Result) */
330
331                         /*
332                          * The 64-bit ACPI integer can hold 16 4-bit BCD characters
333                          * (if table is 32-bit, integer can hold 8 BCD characters)
334                          * Convert each 4-bit BCD value
335                          */
336                         power_of_ten = 1;
337                         return_desc->integer.value = 0;
338                         digit = operand[0]->integer.value;
339
340                         /* Convert each BCD digit (each is one nybble wide) */
341
342                         for (i = 0;
343                              (i < acpi_gbl_integer_nybble_width) && (digit > 0);
344                              i++) {
345
346                                 /* Get the least significant 4-bit BCD digit */
347
348                                 temp32 = ((u32) digit) & 0xF;
349
350                                 /* Check the range of the digit */
351
352                                 if (temp32 > 9) {
353                                         ACPI_ERROR((AE_INFO,
354                                                     "BCD digit too large (not decimal): 0x%X",
355                                                     temp32));
356
357                                         status = AE_AML_NUMERIC_OVERFLOW;
358                                         goto cleanup;
359                                 }
360
361                                 /* Sum the digit into the result with the current power of 10 */
362
363                                 return_desc->integer.value +=
364                                     (((acpi_integer) temp32) * power_of_ten);
365
366                                 /* Shift to next BCD digit */
367
368                                 digit >>= 4;
369
370                                 /* Next power of 10 */
371
372                                 power_of_ten *= 10;
373                         }
374                         break;
375
376                 case AML_TO_BCD_OP:     /* to_bcd (Operand, Result) */
377
378                         return_desc->integer.value = 0;
379                         digit = operand[0]->integer.value;
380
381                         /* Each BCD digit is one nybble wide */
382
383                         for (i = 0;
384                              (i < acpi_gbl_integer_nybble_width) && (digit > 0);
385                              i++) {
386                                 (void)acpi_ut_short_divide(digit, 10, &digit,
387                                                            &temp32);
388
389                                 /*
390                                  * Insert the BCD digit that resides in the
391                                  * remainder from above
392                                  */
393                                 return_desc->integer.value |=
394                                     (((acpi_integer) temp32) << ACPI_MUL_4(i));
395                         }
396
397                         /* Overflow if there is any data left in Digit */
398
399                         if (digit > 0) {
400                                 ACPI_ERROR((AE_INFO,
401                                             "Integer too large to convert to BCD: %8.8X%8.8X",
402                                             ACPI_FORMAT_UINT64(operand[0]->
403                                                                integer.value)));
404                                 status = AE_AML_NUMERIC_OVERFLOW;
405                                 goto cleanup;
406                         }
407                         break;
408
409                 case AML_COND_REF_OF_OP:        /* cond_ref_of (source_object, Result) */
410
411                         /*
412                          * This op is a little strange because the internal return value is
413                          * different than the return value stored in the result descriptor
414                          * (There are really two return values)
415                          */
416                         if ((struct acpi_namespace_node *)operand[0] ==
417                             acpi_gbl_root_node) {
418                                 /*
419                                  * This means that the object does not exist in the namespace,
420                                  * return FALSE
421                                  */
422                                 return_desc->integer.value = 0;
423                                 goto cleanup;
424                         }
425
426                         /* Get the object reference, store it, and remove our reference */
427
428                         status = acpi_ex_get_object_reference(operand[0],
429                                                               &return_desc2,
430                                                               walk_state);
431                         if (ACPI_FAILURE(status)) {
432                                 goto cleanup;
433                         }
434
435                         status =
436                             acpi_ex_store(return_desc2, operand[1], walk_state);
437                         acpi_ut_remove_reference(return_desc2);
438
439                         /* The object exists in the namespace, return TRUE */
440
441                         return_desc->integer.value = ACPI_INTEGER_MAX;
442                         goto cleanup;
443
444                 default:
445                         /* No other opcodes get here */
446                         break;
447                 }
448                 break;
449
450         case AML_STORE_OP:      /* Store (Source, Target) */
451
452                 /*
453                  * A store operand is typically a number, string, buffer or lvalue
454                  * Be careful about deleting the source object,
455                  * since the object itself may have been stored.
456                  */
457                 status = acpi_ex_store(operand[0], operand[1], walk_state);
458                 if (ACPI_FAILURE(status)) {
459                         return_ACPI_STATUS(status);
460                 }
461
462                 /* It is possible that the Store already produced a return object */
463
464                 if (!walk_state->result_obj) {
465                         /*
466                          * Normally, we would remove a reference on the Operand[0]
467                          * parameter; But since it is being used as the internal return
468                          * object (meaning we would normally increment it), the two
469                          * cancel out, and we simply don't do anything.
470                          */
471                         walk_state->result_obj = operand[0];
472                         walk_state->operands[0] = NULL; /* Prevent deletion */
473                 }
474                 return_ACPI_STATUS(status);
475
476                 /*
477                  * ACPI 2.0 Opcodes
478                  */
479         case AML_COPY_OP:       /* Copy (Source, Target) */
480
481                 status =
482                     acpi_ut_copy_iobject_to_iobject(operand[0], &return_desc,
483                                                     walk_state);
484                 break;
485
486         case AML_TO_DECSTRING_OP:       /* to_decimal_string (Data, Result) */
487
488                 status = acpi_ex_convert_to_string(operand[0], &return_desc,
489                                                    ACPI_EXPLICIT_CONVERT_DECIMAL);
490                 if (return_desc == operand[0]) {
491
492                         /* No conversion performed, add ref to handle return value */
493                         acpi_ut_add_reference(return_desc);
494                 }
495                 break;
496
497         case AML_TO_HEXSTRING_OP:       /* to_hex_string (Data, Result) */
498
499                 status = acpi_ex_convert_to_string(operand[0], &return_desc,
500                                                    ACPI_EXPLICIT_CONVERT_HEX);
501                 if (return_desc == operand[0]) {
502
503                         /* No conversion performed, add ref to handle return value */
504                         acpi_ut_add_reference(return_desc);
505                 }
506                 break;
507
508         case AML_TO_BUFFER_OP:  /* to_buffer (Data, Result) */
509
510                 status = acpi_ex_convert_to_buffer(operand[0], &return_desc);
511                 if (return_desc == operand[0]) {
512
513                         /* No conversion performed, add ref to handle return value */
514                         acpi_ut_add_reference(return_desc);
515                 }
516                 break;
517
518         case AML_TO_INTEGER_OP: /* to_integer (Data, Result) */
519
520                 status = acpi_ex_convert_to_integer(operand[0], &return_desc,
521                                                     ACPI_ANY_BASE);
522                 if (return_desc == operand[0]) {
523
524                         /* No conversion performed, add ref to handle return value */
525                         acpi_ut_add_reference(return_desc);
526                 }
527                 break;
528
529         case AML_SHIFT_LEFT_BIT_OP:     /* shift_left_bit (Source, bit_num) */
530         case AML_SHIFT_RIGHT_BIT_OP:    /* shift_right_bit (Source, bit_num) */
531
532                 /* These are two obsolete opcodes */
533
534                 ACPI_ERROR((AE_INFO,
535                             "%s is obsolete and not implemented",
536                             acpi_ps_get_opcode_name(walk_state->opcode)));
537                 status = AE_SUPPORT;
538                 goto cleanup;
539
540         default:                /* Unknown opcode */
541
542                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
543                             walk_state->opcode));
544                 status = AE_AML_BAD_OPCODE;
545                 goto cleanup;
546         }
547
548         if (ACPI_SUCCESS(status)) {
549
550                 /* Store the return value computed above into the target object */
551
552                 status = acpi_ex_store(return_desc, operand[1], walk_state);
553         }
554
555       cleanup:
556
557         /* Delete return object on error */
558
559         if (ACPI_FAILURE(status)) {
560                 acpi_ut_remove_reference(return_desc);
561         }
562
563         /* Save return object on success */
564
565         else if (!walk_state->result_obj) {
566                 walk_state->result_obj = return_desc;
567         }
568
569         return_ACPI_STATUS(status);
570 }
571
572 /*******************************************************************************
573  *
574  * FUNCTION:    acpi_ex_opcode_1A_0T_1R
575  *
576  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
577  *
578  * RETURN:      Status
579  *
580  * DESCRIPTION: Execute opcode with one argument, no target, and a return value
581  *
582  ******************************************************************************/
583
584 acpi_status acpi_ex_opcode_1A_0T_1R(struct acpi_walk_state *walk_state)
585 {
586         union acpi_operand_object **operand = &walk_state->operands[0];
587         union acpi_operand_object *temp_desc;
588         union acpi_operand_object *return_desc = NULL;
589         acpi_status status = AE_OK;
590         u32 type;
591         acpi_integer value;
592
593         ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_1R,
594                                 acpi_ps_get_opcode_name(walk_state->opcode));
595
596         /* Examine the AML opcode */
597
598         switch (walk_state->opcode) {
599         case AML_LNOT_OP:       /* LNot (Operand) */
600
601                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
602                 if (!return_desc) {
603                         status = AE_NO_MEMORY;
604                         goto cleanup;
605                 }
606
607                 /*
608                  * Set result to ONES (TRUE) if Value == 0.  Note:
609                  * return_desc->Integer.Value is initially == 0 (FALSE) from above.
610                  */
611                 if (!operand[0]->integer.value) {
612                         return_desc->integer.value = ACPI_INTEGER_MAX;
613                 }
614                 break;
615
616         case AML_DECREMENT_OP:  /* Decrement (Operand)  */
617         case AML_INCREMENT_OP:  /* Increment (Operand)  */
618
619                 /*
620                  * Create a new integer.  Can't just get the base integer and
621                  * increment it because it may be an Arg or Field.
622                  */
623                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
624                 if (!return_desc) {
625                         status = AE_NO_MEMORY;
626                         goto cleanup;
627                 }
628
629                 /*
630                  * Since we are expecting a Reference operand, it can be either a
631                  * NS Node or an internal object.
632                  */
633                 temp_desc = operand[0];
634                 if (ACPI_GET_DESCRIPTOR_TYPE(temp_desc) ==
635                     ACPI_DESC_TYPE_OPERAND) {
636
637                         /* Internal reference object - prevent deletion */
638
639                         acpi_ut_add_reference(temp_desc);
640                 }
641
642                 /*
643                  * Convert the Reference operand to an Integer (This removes a
644                  * reference on the Operand[0] object)
645                  *
646                  * NOTE:  We use LNOT_OP here in order to force resolution of the
647                  * reference operand to an actual integer.
648                  */
649                 status =
650                     acpi_ex_resolve_operands(AML_LNOT_OP, &temp_desc,
651                                              walk_state);
652                 if (ACPI_FAILURE(status)) {
653                         ACPI_EXCEPTION((AE_INFO, status,
654                                         "While resolving operands for [%s]",
655                                         acpi_ps_get_opcode_name(walk_state->
656                                                                 opcode)));
657
658                         goto cleanup;
659                 }
660
661                 /*
662                  * temp_desc is now guaranteed to be an Integer object --
663                  * Perform the actual increment or decrement
664                  */
665                 if (walk_state->opcode == AML_INCREMENT_OP) {
666                         return_desc->integer.value =
667                             temp_desc->integer.value + 1;
668                 } else {
669                         return_desc->integer.value =
670                             temp_desc->integer.value - 1;
671                 }
672
673                 /* Finished with this Integer object */
674
675                 acpi_ut_remove_reference(temp_desc);
676
677                 /*
678                  * Store the result back (indirectly) through the original
679                  * Reference object
680                  */
681                 status = acpi_ex_store(return_desc, operand[0], walk_state);
682                 break;
683
684         case AML_TYPE_OP:       /* object_type (source_object) */
685
686                 /*
687                  * Note: The operand is not resolved at this point because we want to
688                  * get the associated object, not its value.  For example, we don't
689                  * want to resolve a field_unit to its value, we want the actual
690                  * field_unit object.
691                  */
692
693                 /* Get the type of the base object */
694
695                 status =
696                     acpi_ex_resolve_multiple(walk_state, operand[0], &type,
697                                              NULL);
698                 if (ACPI_FAILURE(status)) {
699                         goto cleanup;
700                 }
701
702                 /* Allocate a descriptor to hold the type. */
703
704                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
705                 if (!return_desc) {
706                         status = AE_NO_MEMORY;
707                         goto cleanup;
708                 }
709
710                 return_desc->integer.value = type;
711                 break;
712
713         case AML_SIZE_OF_OP:    /* size_of (source_object) */
714
715                 /*
716                  * Note: The operand is not resolved at this point because we want to
717                  * get the associated object, not its value.
718                  */
719
720                 /* Get the base object */
721
722                 status = acpi_ex_resolve_multiple(walk_state,
723                                                   operand[0], &type,
724                                                   &temp_desc);
725                 if (ACPI_FAILURE(status)) {
726                         goto cleanup;
727                 }
728
729                 /*
730                  * The type of the base object must be integer, buffer, string, or
731                  * package.  All others are not supported.
732                  *
733                  * NOTE: Integer is not specifically supported by the ACPI spec,
734                  * but is supported implicitly via implicit operand conversion.
735                  * rather than bother with conversion, we just use the byte width
736                  * global (4 or 8 bytes).
737                  */
738                 switch (type) {
739                 case ACPI_TYPE_INTEGER:
740                         value = acpi_gbl_integer_byte_width;
741                         break;
742
743                 case ACPI_TYPE_STRING:
744                         value = temp_desc->string.length;
745                         break;
746
747                 case ACPI_TYPE_BUFFER:
748
749                         /* Buffer arguments may not be evaluated at this point */
750
751                         status = acpi_ds_get_buffer_arguments(temp_desc);
752                         value = temp_desc->buffer.length;
753                         break;
754
755                 case ACPI_TYPE_PACKAGE:
756
757                         /* Package arguments may not be evaluated at this point */
758
759                         status = acpi_ds_get_package_arguments(temp_desc);
760                         value = temp_desc->package.count;
761                         break;
762
763                 default:
764                         ACPI_ERROR((AE_INFO,
765                                     "Operand must be Buffer/Integer/String/Package - found type %s",
766                                     acpi_ut_get_type_name(type)));
767                         status = AE_AML_OPERAND_TYPE;
768                         goto cleanup;
769                 }
770
771                 if (ACPI_FAILURE(status)) {
772                         goto cleanup;
773                 }
774
775                 /*
776                  * Now that we have the size of the object, create a result
777                  * object to hold the value
778                  */
779                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
780                 if (!return_desc) {
781                         status = AE_NO_MEMORY;
782                         goto cleanup;
783                 }
784
785                 return_desc->integer.value = value;
786                 break;
787
788         case AML_REF_OF_OP:     /* ref_of (source_object) */
789
790                 status =
791                     acpi_ex_get_object_reference(operand[0], &return_desc,
792                                                  walk_state);
793                 if (ACPI_FAILURE(status)) {
794                         goto cleanup;
795                 }
796                 break;
797
798         case AML_DEREF_OF_OP:   /* deref_of (obj_reference | String) */
799
800                 /* Check for a method local or argument, or standalone String */
801
802                 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
803                     ACPI_DESC_TYPE_NAMED) {
804                         temp_desc =
805                             acpi_ns_get_attached_object((struct
806                                                          acpi_namespace_node *)
807                                                         operand[0]);
808                         if (temp_desc
809                             &&
810                             ((ACPI_GET_OBJECT_TYPE(temp_desc) ==
811                               ACPI_TYPE_STRING)
812                              || (ACPI_GET_OBJECT_TYPE(temp_desc) ==
813                                  ACPI_TYPE_LOCAL_REFERENCE))) {
814                                 operand[0] = temp_desc;
815                                 acpi_ut_add_reference(temp_desc);
816                         } else {
817                                 status = AE_AML_OPERAND_TYPE;
818                                 goto cleanup;
819                         }
820                 } else {
821                         switch (ACPI_GET_OBJECT_TYPE(operand[0])) {
822                         case ACPI_TYPE_LOCAL_REFERENCE:
823                                 /*
824                                  * This is a deref_of (local_x | arg_x)
825                                  *
826                                  * Must resolve/dereference the local/arg reference first
827                                  */
828                                 switch (operand[0]->reference.class) {
829                                 case ACPI_REFCLASS_LOCAL:
830                                 case ACPI_REFCLASS_ARG:
831
832                                         /* Set Operand[0] to the value of the local/arg */
833
834                                         status =
835                                             acpi_ds_method_data_get_value
836                                             (operand[0]->reference.class,
837                                              operand[0]->reference.value,
838                                              walk_state, &temp_desc);
839                                         if (ACPI_FAILURE(status)) {
840                                                 goto cleanup;
841                                         }
842
843                                         /*
844                                          * Delete our reference to the input object and
845                                          * point to the object just retrieved
846                                          */
847                                         acpi_ut_remove_reference(operand[0]);
848                                         operand[0] = temp_desc;
849                                         break;
850
851                                 case ACPI_REFCLASS_REFOF:
852
853                                         /* Get the object to which the reference refers */
854
855                                         temp_desc =
856                                             operand[0]->reference.object;
857                                         acpi_ut_remove_reference(operand[0]);
858                                         operand[0] = temp_desc;
859                                         break;
860
861                                 default:
862
863                                         /* Must be an Index op - handled below */
864                                         break;
865                                 }
866                                 break;
867
868                         case ACPI_TYPE_STRING:
869                                 break;
870
871                         default:
872                                 status = AE_AML_OPERAND_TYPE;
873                                 goto cleanup;
874                         }
875                 }
876
877                 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) !=
878                     ACPI_DESC_TYPE_NAMED) {
879                         if (ACPI_GET_OBJECT_TYPE(operand[0]) ==
880                             ACPI_TYPE_STRING) {
881                                 /*
882                                  * This is a deref_of (String). The string is a reference
883                                  * to a named ACPI object.
884                                  *
885                                  * 1) Find the owning Node
886                                  * 2) Dereference the node to an actual object. Could be a
887                                  *    Field, so we need to resolve the node to a value.
888                                  */
889                                 status =
890                                     acpi_ns_get_node(walk_state->scope_info->
891                                                      scope.node,
892                                                      operand[0]->string.pointer,
893                                                      ACPI_NS_SEARCH_PARENT,
894                                                      ACPI_CAST_INDIRECT_PTR
895                                                      (struct
896                                                       acpi_namespace_node,
897                                                       &return_desc));
898                                 if (ACPI_FAILURE(status)) {
899                                         goto cleanup;
900                                 }
901
902                                 status =
903                                     acpi_ex_resolve_node_to_value
904                                     (ACPI_CAST_INDIRECT_PTR
905                                      (struct acpi_namespace_node, &return_desc),
906                                      walk_state);
907                                 goto cleanup;
908                         }
909                 }
910
911                 /* Operand[0] may have changed from the code above */
912
913                 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
914                     ACPI_DESC_TYPE_NAMED) {
915                         /*
916                          * This is a deref_of (object_reference)
917                          * Get the actual object from the Node (This is the dereference).
918                          * This case may only happen when a local_x or arg_x is
919                          * dereferenced above.
920                          */
921                         return_desc = acpi_ns_get_attached_object((struct
922                                                                    acpi_namespace_node
923                                                                    *)
924                                                                   operand[0]);
925                         acpi_ut_add_reference(return_desc);
926                 } else {
927                         /*
928                          * This must be a reference object produced by either the
929                          * Index() or ref_of() operator
930                          */
931                         switch (operand[0]->reference.class) {
932                         case ACPI_REFCLASS_INDEX:
933
934                                 /*
935                                  * The target type for the Index operator must be
936                                  * either a Buffer or a Package
937                                  */
938                                 switch (operand[0]->reference.target_type) {
939                                 case ACPI_TYPE_BUFFER_FIELD:
940
941                                         temp_desc =
942                                             operand[0]->reference.object;
943
944                                         /*
945                                          * Create a new object that contains one element of the
946                                          * buffer -- the element pointed to by the index.
947                                          *
948                                          * NOTE: index into a buffer is NOT a pointer to a
949                                          * sub-buffer of the main buffer, it is only a pointer to a
950                                          * single element (byte) of the buffer!
951                                          */
952                                         return_desc =
953                                             acpi_ut_create_internal_object
954                                             (ACPI_TYPE_INTEGER);
955                                         if (!return_desc) {
956                                                 status = AE_NO_MEMORY;
957                                                 goto cleanup;
958                                         }
959
960                                         /*
961                                          * Since we are returning the value of the buffer at the
962                                          * indexed location, we don't need to add an additional
963                                          * reference to the buffer itself.
964                                          */
965                                         return_desc->integer.value =
966                                             temp_desc->buffer.
967                                             pointer[operand[0]->reference.
968                                                     value];
969                                         break;
970
971                                 case ACPI_TYPE_PACKAGE:
972
973                                         /*
974                                          * Return the referenced element of the package.  We must
975                                          * add another reference to the referenced object, however.
976                                          */
977                                         return_desc =
978                                             *(operand[0]->reference.where);
979                                         if (return_desc) {
980                                                 acpi_ut_add_reference
981                                                     (return_desc);
982                                         }
983                                         break;
984
985                                 default:
986
987                                         ACPI_ERROR((AE_INFO,
988                                                     "Unknown Index TargetType %X in reference object %p",
989                                                     operand[0]->reference.
990                                                     target_type, operand[0]));
991                                         status = AE_AML_OPERAND_TYPE;
992                                         goto cleanup;
993                                 }
994                                 break;
995
996                         case ACPI_REFCLASS_REFOF:
997
998                                 return_desc = operand[0]->reference.object;
999
1000                                 if (ACPI_GET_DESCRIPTOR_TYPE(return_desc) ==
1001                                     ACPI_DESC_TYPE_NAMED) {
1002                                         return_desc =
1003                                             acpi_ns_get_attached_object((struct
1004                                                                          acpi_namespace_node
1005                                                                          *)
1006                                                                         return_desc);
1007                                 }
1008
1009                                 /* Add another reference to the object! */
1010
1011                                 acpi_ut_add_reference(return_desc);
1012                                 break;
1013
1014                         default:
1015                                 ACPI_ERROR((AE_INFO,
1016                                             "Unknown class in reference(%p) - %2.2X",
1017                                             operand[0],
1018                                             operand[0]->reference.class));
1019
1020                                 status = AE_TYPE;
1021                                 goto cleanup;
1022                         }
1023                 }
1024                 break;
1025
1026         default:
1027
1028                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
1029                             walk_state->opcode));
1030                 status = AE_AML_BAD_OPCODE;
1031                 goto cleanup;
1032         }
1033
1034       cleanup:
1035
1036         /* Delete return object on error */
1037
1038         if (ACPI_FAILURE(status)) {
1039                 acpi_ut_remove_reference(return_desc);
1040         }
1041
1042         /* Save return object on success */
1043
1044         else {
1045                 walk_state->result_obj = return_desc;
1046         }
1047
1048         return_ACPI_STATUS(status);
1049 }