Merge /spare/repo/linux-2.6/
[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 - 2005, R. Byron Moore
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 #if ACPI_MACHINE_WIDTH != 16
108                 return_desc->integer.value = acpi_os_get_timer();
109 #endif
110                 break;
111
112         default:                /*  Unknown opcode  */
113
114                 ACPI_REPORT_ERROR(("acpi_ex_opcode_0A_0T_1R: Unknown opcode %X\n", 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         } 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_REPORT_ERROR(("acpi_ex_opcode_1A_0T_0R: Unknown opcode %X\n", walk_state->opcode));
192                 status = AE_AML_BAD_OPCODE;
193                 break;
194         }
195
196         return_ACPI_STATUS(status);
197 }
198
199 /*******************************************************************************
200  *
201  * FUNCTION:    acpi_ex_opcode_1A_1T_0R
202  *
203  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
204  *
205  * RETURN:      Status
206  *
207  * DESCRIPTION: Execute opcode with one argument, one target, and no
208  *              return value.
209  *
210  ******************************************************************************/
211
212 acpi_status acpi_ex_opcode_1A_1T_0R(struct acpi_walk_state *walk_state)
213 {
214         acpi_status status = AE_OK;
215         union acpi_operand_object **operand = &walk_state->operands[0];
216
217         ACPI_FUNCTION_TRACE_STR("ex_opcode_1A_1T_0R",
218                                 acpi_ps_get_opcode_name(walk_state->opcode));
219
220         /* Examine the AML opcode */
221
222         switch (walk_state->opcode) {
223         case AML_LOAD_OP:
224
225                 status = acpi_ex_load_op(operand[0], operand[1], walk_state);
226                 break;
227
228         default:                /* Unknown opcode */
229
230                 ACPI_REPORT_ERROR(("acpi_ex_opcode_1A_1T_0R: Unknown opcode %X\n", walk_state->opcode));
231                 status = AE_AML_BAD_OPCODE;
232                 goto cleanup;
233         }
234
235       cleanup:
236
237         return_ACPI_STATUS(status);
238 }
239
240 /*******************************************************************************
241  *
242  * FUNCTION:    acpi_ex_opcode_1A_1T_1R
243  *
244  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
245  *
246  * RETURN:      Status
247  *
248  * DESCRIPTION: Execute opcode with one argument, one target, and a
249  *              return value.
250  *
251  ******************************************************************************/
252
253 acpi_status acpi_ex_opcode_1A_1T_1R(struct acpi_walk_state *walk_state)
254 {
255         acpi_status status = AE_OK;
256         union acpi_operand_object **operand = &walk_state->operands[0];
257         union acpi_operand_object *return_desc = NULL;
258         union acpi_operand_object *return_desc2 = NULL;
259         u32 temp32;
260         u32 i;
261         acpi_integer power_of_ten;
262         acpi_integer digit;
263
264         ACPI_FUNCTION_TRACE_STR("ex_opcode_1A_1T_1R",
265                                 acpi_ps_get_opcode_name(walk_state->opcode));
266
267         /* Examine the AML opcode */
268
269         switch (walk_state->opcode) {
270         case AML_BIT_NOT_OP:
271         case AML_FIND_SET_LEFT_BIT_OP:
272         case AML_FIND_SET_RIGHT_BIT_OP:
273         case AML_FROM_BCD_OP:
274         case AML_TO_BCD_OP:
275         case AML_COND_REF_OF_OP:
276
277                 /* Create a return object of type Integer for these opcodes */
278
279                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
280                 if (!return_desc) {
281                         status = AE_NO_MEMORY;
282                         goto cleanup;
283                 }
284
285                 switch (walk_state->opcode) {
286                 case AML_BIT_NOT_OP:    /* Not (Operand, Result)  */
287
288                         return_desc->integer.value = ~operand[0]->integer.value;
289                         break;
290
291                 case AML_FIND_SET_LEFT_BIT_OP:  /* find_set_left_bit (Operand, Result) */
292
293                         return_desc->integer.value = operand[0]->integer.value;
294
295                         /*
296                          * Acpi specification describes Integer type as a little
297                          * endian unsigned value, so this boundary condition is valid.
298                          */
299                         for (temp32 = 0; return_desc->integer.value &&
300                              temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
301                                 return_desc->integer.value >>= 1;
302                         }
303
304                         return_desc->integer.value = temp32;
305                         break;
306
307                 case AML_FIND_SET_RIGHT_BIT_OP: /* find_set_right_bit (Operand, Result) */
308
309                         return_desc->integer.value = operand[0]->integer.value;
310
311                         /*
312                          * The Acpi specification describes Integer type as a little
313                          * endian unsigned value, so this boundary condition is valid.
314                          */
315                         for (temp32 = 0; return_desc->integer.value &&
316                              temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
317                                 return_desc->integer.value <<= 1;
318                         }
319
320                         /* Since the bit position is one-based, subtract from 33 (65) */
321
322                         return_desc->integer.value = temp32 == 0 ? 0 :
323                             (ACPI_INTEGER_BIT_SIZE + 1) - temp32;
324                         break;
325
326                 case AML_FROM_BCD_OP:   /* from_bcd (BCDValue, Result) */
327
328                         /*
329                          * The 64-bit ACPI integer can hold 16 4-bit BCD characters
330                          * (if table is 32-bit, integer can hold 8 BCD characters)
331                          * Convert each 4-bit BCD value
332                          */
333                         power_of_ten = 1;
334                         return_desc->integer.value = 0;
335                         digit = operand[0]->integer.value;
336
337                         /* Convert each BCD digit (each is one nybble wide) */
338
339                         for (i = 0;
340                              (i < acpi_gbl_integer_nybble_width) && (digit > 0);
341                              i++) {
342                                 /* Get the least significant 4-bit BCD digit */
343
344                                 temp32 = ((u32) digit) & 0xF;
345
346                                 /* Check the range of the digit */
347
348                                 if (temp32 > 9) {
349                                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
350                                                           "BCD digit too large (not decimal): 0x%X\n",
351                                                           temp32));
352
353                                         status = AE_AML_NUMERIC_OVERFLOW;
354                                         goto cleanup;
355                                 }
356
357                                 /* Sum the digit into the result with the current power of 10 */
358
359                                 return_desc->integer.value +=
360                                     (((acpi_integer) temp32) * power_of_ten);
361
362                                 /* Shift to next BCD digit */
363
364                                 digit >>= 4;
365
366                                 /* Next power of 10 */
367
368                                 power_of_ten *= 10;
369                         }
370                         break;
371
372                 case AML_TO_BCD_OP:     /* to_bcd (Operand, Result) */
373
374                         return_desc->integer.value = 0;
375                         digit = operand[0]->integer.value;
376
377                         /* Each BCD digit is one nybble wide */
378
379                         for (i = 0;
380                              (i < acpi_gbl_integer_nybble_width) && (digit > 0);
381                              i++) {
382                                 (void)acpi_ut_short_divide(digit, 10, &digit,
383                                                            &temp32);
384
385                                 /*
386                                  * Insert the BCD digit that resides in the
387                                  * remainder from above
388                                  */
389                                 return_desc->integer.value |=
390                                     (((acpi_integer) temp32) << ACPI_MUL_4(i));
391                         }
392
393                         /* Overflow if there is any data left in Digit */
394
395                         if (digit > 0) {
396                                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
397                                                   "Integer too large to convert to BCD: %8.8X%8.8X\n",
398                                                   ACPI_FORMAT_UINT64(operand
399                                                                      [0]->
400                                                                      integer.
401                                                                      value)));
402                                 status = AE_AML_NUMERIC_OVERFLOW;
403                                 goto cleanup;
404                         }
405                         break;
406
407                 case AML_COND_REF_OF_OP:        /* cond_ref_of (source_object, Result) */
408
409                         /*
410                          * This op is a little strange because the internal return value is
411                          * different than the return value stored in the result descriptor
412                          * (There are really two return values)
413                          */
414                         if ((struct acpi_namespace_node *)operand[0] ==
415                             acpi_gbl_root_node) {
416                                 /*
417                                  * This means that the object does not exist in the namespace,
418                                  * return FALSE
419                                  */
420                                 return_desc->integer.value = 0;
421                                 goto cleanup;
422                         }
423
424                         /* Get the object reference, store it, and remove our reference */
425
426                         status = acpi_ex_get_object_reference(operand[0],
427                                                               &return_desc2,
428                                                               walk_state);
429                         if (ACPI_FAILURE(status)) {
430                                 goto cleanup;
431                         }
432
433                         status =
434                             acpi_ex_store(return_desc2, operand[1], walk_state);
435                         acpi_ut_remove_reference(return_desc2);
436
437                         /* The object exists in the namespace, return TRUE */
438
439                         return_desc->integer.value = ACPI_INTEGER_MAX;
440                         goto cleanup;
441
442                 default:
443                         /* No other opcodes get here */
444                         break;
445                 }
446                 break;
447
448         case AML_STORE_OP:      /* Store (Source, Target) */
449
450                 /*
451                  * A store operand is typically a number, string, buffer or lvalue
452                  * Be careful about deleting the source object,
453                  * since the object itself may have been stored.
454                  */
455                 status = acpi_ex_store(operand[0], operand[1], walk_state);
456                 if (ACPI_FAILURE(status)) {
457                         return_ACPI_STATUS(status);
458                 }
459
460                 /* It is possible that the Store already produced a return object */
461
462                 if (!walk_state->result_obj) {
463                         /*
464                          * Normally, we would remove a reference on the Operand[0]
465                          * parameter; But since it is being used as the internal return
466                          * object (meaning we would normally increment it), the two
467                          * cancel out, and we simply don't do anything.
468                          */
469                         walk_state->result_obj = operand[0];
470                         walk_state->operands[0] = NULL; /* Prevent deletion */
471                 }
472                 return_ACPI_STATUS(status);
473
474                 /*
475                  * ACPI 2.0 Opcodes
476                  */
477         case AML_COPY_OP:       /* Copy (Source, Target) */
478
479                 status =
480                     acpi_ut_copy_iobject_to_iobject(operand[0], &return_desc,
481                                                     walk_state);
482                 break;
483
484         case AML_TO_DECSTRING_OP:       /* to_decimal_string (Data, Result) */
485
486                 status = acpi_ex_convert_to_string(operand[0], &return_desc,
487                                                    ACPI_EXPLICIT_CONVERT_DECIMAL);
488                 if (return_desc == operand[0]) {
489                         /* No conversion performed, add ref to handle return value */
490                         acpi_ut_add_reference(return_desc);
491                 }
492                 break;
493
494         case AML_TO_HEXSTRING_OP:       /* to_hex_string (Data, Result) */
495
496                 status = acpi_ex_convert_to_string(operand[0], &return_desc,
497                                                    ACPI_EXPLICIT_CONVERT_HEX);
498                 if (return_desc == operand[0]) {
499                         /* No conversion performed, add ref to handle return value */
500                         acpi_ut_add_reference(return_desc);
501                 }
502                 break;
503
504         case AML_TO_BUFFER_OP:  /* to_buffer (Data, Result) */
505
506                 status = acpi_ex_convert_to_buffer(operand[0], &return_desc);
507                 if (return_desc == operand[0]) {
508                         /* No conversion performed, add ref to handle return value */
509                         acpi_ut_add_reference(return_desc);
510                 }
511                 break;
512
513         case AML_TO_INTEGER_OP: /* to_integer (Data, Result) */
514
515                 status = acpi_ex_convert_to_integer(operand[0], &return_desc,
516                                                     ACPI_ANY_BASE);
517                 if (return_desc == operand[0]) {
518                         /* No conversion performed, add ref to handle return value */
519                         acpi_ut_add_reference(return_desc);
520                 }
521                 break;
522
523         case AML_SHIFT_LEFT_BIT_OP:     /* shift_left_bit (Source, bit_num) */
524         case AML_SHIFT_RIGHT_BIT_OP:    /* shift_right_bit (Source, bit_num) */
525
526                 /* These are two obsolete opcodes */
527
528                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
529                                   "%s is obsolete and not implemented\n",
530                                   acpi_ps_get_opcode_name(walk_state->opcode)));
531                 status = AE_SUPPORT;
532                 goto cleanup;
533
534         default:                /* Unknown opcode */
535
536                 ACPI_REPORT_ERROR(("acpi_ex_opcode_1A_1T_1R: Unknown opcode %X\n", walk_state->opcode));
537                 status = AE_AML_BAD_OPCODE;
538                 goto cleanup;
539         }
540
541         if (ACPI_SUCCESS(status)) {
542                 /* Store the return value computed above into the target object */
543
544                 status = acpi_ex_store(return_desc, operand[1], walk_state);
545         }
546
547       cleanup:
548
549         if (!walk_state->result_obj) {
550                 walk_state->result_obj = return_desc;
551         }
552
553         /* Delete return object on error */
554
555         if (ACPI_FAILURE(status)) {
556                 acpi_ut_remove_reference(return_desc);
557         }
558
559         return_ACPI_STATUS(status);
560 }
561
562 /*******************************************************************************
563  *
564  * FUNCTION:    acpi_ex_opcode_1A_0T_1R
565  *
566  * PARAMETERS:  walk_state          - Current state (contains AML opcode)
567  *
568  * RETURN:      Status
569  *
570  * DESCRIPTION: Execute opcode with one argument, no target, and a return value
571  *
572  ******************************************************************************/
573
574 acpi_status acpi_ex_opcode_1A_0T_1R(struct acpi_walk_state *walk_state)
575 {
576         union acpi_operand_object **operand = &walk_state->operands[0];
577         union acpi_operand_object *temp_desc;
578         union acpi_operand_object *return_desc = NULL;
579         acpi_status status = AE_OK;
580         u32 type;
581         acpi_integer value;
582
583         ACPI_FUNCTION_TRACE_STR("ex_opcode_1A_0T_1R",
584                                 acpi_ps_get_opcode_name(walk_state->opcode));
585
586         /* Examine the AML opcode */
587
588         switch (walk_state->opcode) {
589         case AML_LNOT_OP:       /* LNot (Operand) */
590
591                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
592                 if (!return_desc) {
593                         status = AE_NO_MEMORY;
594                         goto cleanup;
595                 }
596
597                 /*
598                  * Set result to ONES (TRUE) if Value == 0.  Note:
599                  * return_desc->Integer.Value is initially == 0 (FALSE) from above.
600                  */
601                 if (!operand[0]->integer.value) {
602                         return_desc->integer.value = ACPI_INTEGER_MAX;
603                 }
604                 break;
605
606         case AML_DECREMENT_OP:  /* Decrement (Operand)  */
607         case AML_INCREMENT_OP:  /* Increment (Operand)  */
608
609                 /*
610                  * Create a new integer.  Can't just get the base integer and
611                  * increment it because it may be an Arg or Field.
612                  */
613                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
614                 if (!return_desc) {
615                         status = AE_NO_MEMORY;
616                         goto cleanup;
617                 }
618
619                 /*
620                  * Since we are expecting a Reference operand, it can be either a
621                  * NS Node or an internal object.
622                  */
623                 temp_desc = operand[0];
624                 if (ACPI_GET_DESCRIPTOR_TYPE(temp_desc) ==
625                     ACPI_DESC_TYPE_OPERAND) {
626                         /* Internal reference object - prevent deletion */
627
628                         acpi_ut_add_reference(temp_desc);
629                 }
630
631                 /*
632                  * Convert the Reference operand to an Integer (This removes a
633                  * reference on the Operand[0] object)
634                  *
635                  * NOTE:  We use LNOT_OP here in order to force resolution of the
636                  * reference operand to an actual integer.
637                  */
638                 status =
639                     acpi_ex_resolve_operands(AML_LNOT_OP, &temp_desc,
640                                              walk_state);
641                 if (ACPI_FAILURE(status)) {
642                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
643                                           "%s: bad operand(s) %s\n",
644                                           acpi_ps_get_opcode_name(walk_state->
645                                                                   opcode),
646                                           acpi_format_exception(status)));
647
648                         goto cleanup;
649                 }
650
651                 /*
652                  * temp_desc is now guaranteed to be an Integer object --
653                  * Perform the actual increment or decrement
654                  */
655                 if (walk_state->opcode == AML_INCREMENT_OP) {
656                         return_desc->integer.value =
657                             temp_desc->integer.value + 1;
658                 } else {
659                         return_desc->integer.value =
660                             temp_desc->integer.value - 1;
661                 }
662
663                 /* Finished with this Integer object */
664
665                 acpi_ut_remove_reference(temp_desc);
666
667                 /*
668                  * Store the result back (indirectly) through the original
669                  * Reference object
670                  */
671                 status = acpi_ex_store(return_desc, operand[0], walk_state);
672                 break;
673
674         case AML_TYPE_OP:       /* object_type (source_object) */
675
676                 /*
677                  * Note: The operand is not resolved at this point because we want to
678                  * get the associated object, not its value.  For example, we don't
679                  * want to resolve a field_unit to its value, we want the actual
680                  * field_unit object.
681                  */
682
683                 /* Get the type of the base object */
684
685                 status =
686                     acpi_ex_resolve_multiple(walk_state, operand[0], &type,
687                                              NULL);
688                 if (ACPI_FAILURE(status)) {
689                         goto cleanup;
690                 }
691                 /* Allocate a descriptor to hold the type. */
692
693                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
694                 if (!return_desc) {
695                         status = AE_NO_MEMORY;
696                         goto cleanup;
697                 }
698
699                 return_desc->integer.value = type;
700                 break;
701
702         case AML_SIZE_OF_OP:    /* size_of (source_object) */
703
704                 /*
705                  * Note: The operand is not resolved at this point because we want to
706                  * get the associated object, not its value.
707                  */
708
709                 /* Get the base object */
710
711                 status = acpi_ex_resolve_multiple(walk_state,
712                                                   operand[0], &type,
713                                                   &temp_desc);
714                 if (ACPI_FAILURE(status)) {
715                         goto cleanup;
716                 }
717
718                 /*
719                  * The type of the base object must be integer, buffer, string, or
720                  * package.  All others are not supported.
721                  *
722                  * NOTE: Integer is not specifically supported by the ACPI spec,
723                  * but is supported implicitly via implicit operand conversion.
724                  * rather than bother with conversion, we just use the byte width
725                  * global (4 or 8 bytes).
726                  */
727                 switch (type) {
728                 case ACPI_TYPE_INTEGER:
729                         value = acpi_gbl_integer_byte_width;
730                         break;
731
732                 case ACPI_TYPE_BUFFER:
733                         value = temp_desc->buffer.length;
734                         break;
735
736                 case ACPI_TYPE_STRING:
737                         value = temp_desc->string.length;
738                         break;
739
740                 case ACPI_TYPE_PACKAGE:
741                         value = temp_desc->package.count;
742                         break;
743
744                 default:
745                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
746                                           "size_of - Operand is not Buf/Int/Str/Pkg - found type %s\n",
747                                           acpi_ut_get_type_name(type)));
748                         status = AE_AML_OPERAND_TYPE;
749                         goto cleanup;
750                 }
751
752                 /*
753                  * Now that we have the size of the object, create a result
754                  * object to hold the value
755                  */
756                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
757                 if (!return_desc) {
758                         status = AE_NO_MEMORY;
759                         goto cleanup;
760                 }
761
762                 return_desc->integer.value = value;
763                 break;
764
765         case AML_REF_OF_OP:     /* ref_of (source_object) */
766
767                 status =
768                     acpi_ex_get_object_reference(operand[0], &return_desc,
769                                                  walk_state);
770                 if (ACPI_FAILURE(status)) {
771                         goto cleanup;
772                 }
773                 break;
774
775         case AML_DEREF_OF_OP:   /* deref_of (obj_reference | String) */
776
777                 /* Check for a method local or argument, or standalone String */
778
779                 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) !=
780                     ACPI_DESC_TYPE_NAMED) {
781                         switch (ACPI_GET_OBJECT_TYPE(operand[0])) {
782                         case ACPI_TYPE_LOCAL_REFERENCE:
783                                 /*
784                                  * This is a deref_of (local_x | arg_x)
785                                  *
786                                  * Must resolve/dereference the local/arg reference first
787                                  */
788                                 switch (operand[0]->reference.opcode) {
789                                 case AML_LOCAL_OP:
790                                 case AML_ARG_OP:
791
792                                         /* Set Operand[0] to the value of the local/arg */
793
794                                         status =
795                                             acpi_ds_method_data_get_value
796                                             (operand[0]->reference.opcode,
797                                              operand[0]->reference.offset,
798                                              walk_state, &temp_desc);
799                                         if (ACPI_FAILURE(status)) {
800                                                 goto cleanup;
801                                         }
802
803                                         /*
804                                          * Delete our reference to the input object and
805                                          * point to the object just retrieved
806                                          */
807                                         acpi_ut_remove_reference(operand[0]);
808                                         operand[0] = temp_desc;
809                                         break;
810
811                                 case AML_REF_OF_OP:
812
813                                         /* Get the object to which the reference refers */
814
815                                         temp_desc =
816                                             operand[0]->reference.object;
817                                         acpi_ut_remove_reference(operand[0]);
818                                         operand[0] = temp_desc;
819                                         break;
820
821                                 default:
822
823                                         /* Must be an Index op - handled below */
824                                         break;
825                                 }
826                                 break;
827
828                         case ACPI_TYPE_STRING:
829
830                                 /*
831                                  * This is a deref_of (String). The string is a reference
832                                  * to a named ACPI object.
833                                  *
834                                  * 1) Find the owning Node
835                                  * 2) Dereference the node to an actual object.  Could be a
836                                  *    Field, so we need to resolve the node to a value.
837                                  */
838                                 status =
839                                     acpi_ns_get_node_by_path(operand[0]->string.
840                                                              pointer,
841                                                              walk_state->
842                                                              scope_info->scope.
843                                                              node,
844                                                              ACPI_NS_SEARCH_PARENT,
845                                                              ACPI_CAST_INDIRECT_PTR
846                                                              (struct
847                                                               acpi_namespace_node,
848                                                               &return_desc));
849                                 if (ACPI_FAILURE(status)) {
850                                         goto cleanup;
851                                 }
852
853                                 status =
854                                     acpi_ex_resolve_node_to_value
855                                     (ACPI_CAST_INDIRECT_PTR
856                                      (struct acpi_namespace_node, &return_desc),
857                                      walk_state);
858                                 goto cleanup;
859
860                         default:
861
862                                 status = AE_AML_OPERAND_TYPE;
863                                 goto cleanup;
864                         }
865                 }
866
867                 /* Operand[0] may have changed from the code above */
868
869                 if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
870                     ACPI_DESC_TYPE_NAMED) {
871                         /*
872                          * This is a deref_of (object_reference)
873                          * Get the actual object from the Node (This is the dereference).
874                          * This case may only happen when a local_x or arg_x is
875                          * dereferenced above.
876                          */
877                         return_desc = acpi_ns_get_attached_object((struct
878                                                                    acpi_namespace_node
879                                                                    *)
880                                                                   operand[0]);
881                         acpi_ut_add_reference(return_desc);
882                 } else {
883                         /*
884                          * This must be a reference object produced by either the
885                          * Index() or ref_of() operator
886                          */
887                         switch (operand[0]->reference.opcode) {
888                         case AML_INDEX_OP:
889
890                                 /*
891                                  * The target type for the Index operator must be
892                                  * either a Buffer or a Package
893                                  */
894                                 switch (operand[0]->reference.target_type) {
895                                 case ACPI_TYPE_BUFFER_FIELD:
896
897                                         temp_desc =
898                                             operand[0]->reference.object;
899
900                                         /*
901                                          * Create a new object that contains one element of the
902                                          * buffer -- the element pointed to by the index.
903                                          *
904                                          * NOTE: index into a buffer is NOT a pointer to a
905                                          * sub-buffer of the main buffer, it is only a pointer to a
906                                          * single element (byte) of the buffer!
907                                          */
908                                         return_desc =
909                                             acpi_ut_create_internal_object
910                                             (ACPI_TYPE_INTEGER);
911                                         if (!return_desc) {
912                                                 status = AE_NO_MEMORY;
913                                                 goto cleanup;
914                                         }
915
916                                         /*
917                                          * Since we are returning the value of the buffer at the
918                                          * indexed location, we don't need to add an additional
919                                          * reference to the buffer itself.
920                                          */
921                                         return_desc->integer.value =
922                                             temp_desc->buffer.
923                                             pointer[operand[0]->reference.
924                                                     offset];
925                                         break;
926
927                                 case ACPI_TYPE_PACKAGE:
928
929                                         /*
930                                          * Return the referenced element of the package.  We must
931                                          * add another reference to the referenced object, however.
932                                          */
933                                         return_desc =
934                                             *(operand[0]->reference.where);
935                                         if (return_desc) {
936                                                 acpi_ut_add_reference
937                                                     (return_desc);
938                                         }
939
940                                         break;
941
942                                 default:
943
944                                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
945                                                           "Unknown Index target_type %X in obj %p\n",
946                                                           operand[0]->reference.
947                                                           target_type,
948                                                           operand[0]));
949                                         status = AE_AML_OPERAND_TYPE;
950                                         goto cleanup;
951                                 }
952                                 break;
953
954                         case AML_REF_OF_OP:
955
956                                 return_desc = operand[0]->reference.object;
957
958                                 if (ACPI_GET_DESCRIPTOR_TYPE(return_desc) ==
959                                     ACPI_DESC_TYPE_NAMED) {
960
961                                         return_desc =
962                                             acpi_ns_get_attached_object((struct
963                                                                          acpi_namespace_node
964                                                                          *)
965                                                                         return_desc);
966                                 }
967
968                                 /* Add another reference to the object! */
969
970                                 acpi_ut_add_reference(return_desc);
971                                 break;
972
973                         default:
974                                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
975                                                   "Unknown opcode in ref(%p) - %X\n",
976                                                   operand[0],
977                                                   operand[0]->reference.
978                                                   opcode));
979
980                                 status = AE_TYPE;
981                                 goto cleanup;
982                         }
983                 }
984                 break;
985
986         default:
987
988                 ACPI_REPORT_ERROR(("acpi_ex_opcode_1A_0T_1R: Unknown opcode %X\n", walk_state->opcode));
989                 status = AE_AML_BAD_OPCODE;
990                 goto cleanup;
991         }
992
993       cleanup:
994
995         /* Delete return object on error */
996
997         if (ACPI_FAILURE(status)) {
998                 acpi_ut_remove_reference(return_desc);
999         }
1000
1001         walk_state->result_obj = return_desc;
1002         return_ACPI_STATUS(status);
1003 }