2 /******************************************************************************
4 * Module Name: exresolv - AML Interpreter object resolution
6 *****************************************************************************/
9 * Copyright (C) 2000 - 2006, R. Byron Moore
10 * All rights reserved.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
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.
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.
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.
45 #include <acpi/acpi.h>
46 #include <acpi/amlcode.h>
47 #include <acpi/acdispat.h>
48 #include <acpi/acinterp.h>
49 #include <acpi/acnamesp.h>
50 #include <acpi/acparser.h>
52 #define _COMPONENT ACPI_EXECUTER
53 ACPI_MODULE_NAME("exresolv")
55 /* Local prototypes */
57 acpi_ex_resolve_object_to_value(union acpi_operand_object
**stack_ptr
,
58 struct acpi_walk_state
*walk_state
);
60 /*******************************************************************************
62 * FUNCTION: acpi_ex_resolve_to_value
64 * PARAMETERS: **stack_ptr - Points to entry on obj_stack, which can
65 * be either an (union acpi_operand_object *)
67 * walk_state - Current method state
71 * DESCRIPTION: Convert Reference objects to values
73 ******************************************************************************/
76 acpi_ex_resolve_to_value(union acpi_operand_object
**stack_ptr
,
77 struct acpi_walk_state
*walk_state
)
81 ACPI_FUNCTION_TRACE_PTR(ex_resolve_to_value
, stack_ptr
);
83 if (!stack_ptr
|| !*stack_ptr
) {
84 ACPI_ERROR((AE_INFO
, "Internal - null pointer"));
85 return_ACPI_STATUS(AE_AML_NO_OPERAND
);
89 * The entity pointed to by the stack_ptr can be either
90 * 1) A valid union acpi_operand_object, or
91 * 2) A struct acpi_namespace_node (named_obj)
93 if (ACPI_GET_DESCRIPTOR_TYPE(*stack_ptr
) == ACPI_DESC_TYPE_OPERAND
) {
94 status
= acpi_ex_resolve_object_to_value(stack_ptr
, walk_state
);
95 if (ACPI_FAILURE(status
)) {
96 return_ACPI_STATUS(status
);
100 ACPI_ERROR((AE_INFO
, "Internal - null pointer"));
101 return_ACPI_STATUS(AE_AML_NO_OPERAND
);
106 * Object on the stack may have changed if acpi_ex_resolve_object_to_value()
107 * was called (i.e., we can't use an _else_ here.)
109 if (ACPI_GET_DESCRIPTOR_TYPE(*stack_ptr
) == ACPI_DESC_TYPE_NAMED
) {
111 acpi_ex_resolve_node_to_value(ACPI_CAST_INDIRECT_PTR
112 (struct acpi_namespace_node
,
113 stack_ptr
), walk_state
);
114 if (ACPI_FAILURE(status
)) {
115 return_ACPI_STATUS(status
);
119 ACPI_DEBUG_PRINT((ACPI_DB_EXEC
, "Resolved object %p\n", *stack_ptr
));
120 return_ACPI_STATUS(AE_OK
);
123 /*******************************************************************************
125 * FUNCTION: acpi_ex_resolve_object_to_value
127 * PARAMETERS: stack_ptr - Pointer to an internal object
128 * walk_state - Current method state
132 * DESCRIPTION: Retrieve the value from an internal object. The Reference type
133 * uses the associated AML opcode to determine the value.
135 ******************************************************************************/
138 acpi_ex_resolve_object_to_value(union acpi_operand_object
**stack_ptr
,
139 struct acpi_walk_state
*walk_state
)
141 acpi_status status
= AE_OK
;
142 union acpi_operand_object
*stack_desc
;
144 union acpi_operand_object
*obj_desc
;
147 ACPI_FUNCTION_TRACE(ex_resolve_object_to_value
);
149 stack_desc
= *stack_ptr
;
151 /* This is an union acpi_operand_object */
153 switch (ACPI_GET_OBJECT_TYPE(stack_desc
)) {
154 case ACPI_TYPE_LOCAL_REFERENCE
:
156 opcode
= stack_desc
->reference
.opcode
;
162 * Convert name reference to a namespace node
163 * Then, acpi_ex_resolve_node_to_value can be used to get the value
165 temp_node
= stack_desc
->reference
.object
;
167 /* Delete the Reference Object */
169 acpi_ut_remove_reference(stack_desc
);
171 /* Return the namespace node */
173 (*stack_ptr
) = temp_node
;
180 * Get the local from the method's state info
181 * Note: this increments the local's object reference count
183 status
= acpi_ds_method_data_get_value(opcode
,
188 if (ACPI_FAILURE(status
)) {
189 return_ACPI_STATUS(status
);
192 ACPI_DEBUG_PRINT((ACPI_DB_EXEC
,
193 "[Arg/Local %X] ValueObj is %p\n",
194 stack_desc
->reference
.offset
,
198 * Now we can delete the original Reference Object and
199 * replace it with the resolved value
201 acpi_ut_remove_reference(stack_desc
);
202 *stack_ptr
= obj_desc
;
207 switch (stack_desc
->reference
.target_type
) {
208 case ACPI_TYPE_BUFFER_FIELD
:
210 /* Just return - leave the Reference on the stack */
213 case ACPI_TYPE_PACKAGE
:
215 obj_desc
= *stack_desc
->reference
.where
;
218 * Valid obj descriptor, copy pointer to return value
219 * (i.e., dereference the package index)
220 * Delete the ref object, increment the returned object
222 acpi_ut_remove_reference(stack_desc
);
223 acpi_ut_add_reference(obj_desc
);
224 *stack_ptr
= obj_desc
;
227 * A NULL object descriptor means an unitialized element of
228 * the package, can't dereference it
231 "Attempt to deref an Index to NULL pkg element Idx=%p",
233 status
= AE_AML_UNINITIALIZED_ELEMENT
;
239 /* Invalid reference object */
242 "Unknown TargetType %X in Index/Reference obj %p",
243 stack_desc
->reference
.target_type
,
245 status
= AE_AML_INTERNAL
;
254 /* Just leave the object as-is */
258 case AML_INT_NAMEPATH_OP
: /* Reference to a named object */
260 /* Dereference the name */
262 if ((stack_desc
->reference
.node
->type
==
264 || (stack_desc
->reference
.node
->type
==
265 ACPI_TYPE_THERMAL
)) {
267 /* These node types do not have 'real' subobjects */
269 *stack_ptr
= (void *)stack_desc
->reference
.node
;
271 /* Get the object pointed to by the namespace node */
274 (stack_desc
->reference
.node
)->object
;
275 acpi_ut_add_reference(*stack_ptr
);
278 acpi_ut_remove_reference(stack_desc
);
284 "Unknown Reference opcode %X (%s) in %p",
285 opcode
, acpi_ps_get_opcode_name(opcode
),
287 status
= AE_AML_INTERNAL
;
292 case ACPI_TYPE_BUFFER
:
294 status
= acpi_ds_get_buffer_arguments(stack_desc
);
297 case ACPI_TYPE_PACKAGE
:
299 status
= acpi_ds_get_package_arguments(stack_desc
);
302 /* These cases may never happen here, but just in case.. */
304 case ACPI_TYPE_BUFFER_FIELD
:
305 case ACPI_TYPE_LOCAL_REGION_FIELD
:
306 case ACPI_TYPE_LOCAL_BANK_FIELD
:
307 case ACPI_TYPE_LOCAL_INDEX_FIELD
:
309 ACPI_DEBUG_PRINT((ACPI_DB_EXEC
,
310 "FieldRead SourceDesc=%p Type=%X\n",
312 ACPI_GET_OBJECT_TYPE(stack_desc
)));
315 acpi_ex_read_data_from_field(walk_state
, stack_desc
,
317 *stack_ptr
= (void *)obj_desc
;
324 return_ACPI_STATUS(status
);
327 /*******************************************************************************
329 * FUNCTION: acpi_ex_resolve_multiple
331 * PARAMETERS: walk_state - Current state (contains AML opcode)
332 * Operand - Starting point for resolution
333 * return_type - Where the object type is returned
334 * return_desc - Where the resolved object is returned
338 * DESCRIPTION: Return the base object and type. Traverse a reference list if
339 * necessary to get to the base object.
341 ******************************************************************************/
344 acpi_ex_resolve_multiple(struct acpi_walk_state
*walk_state
,
345 union acpi_operand_object
*operand
,
346 acpi_object_type
* return_type
,
347 union acpi_operand_object
**return_desc
)
349 union acpi_operand_object
*obj_desc
= (void *)operand
;
350 struct acpi_namespace_node
*node
;
351 acpi_object_type type
;
354 ACPI_FUNCTION_TRACE(acpi_ex_resolve_multiple
);
356 /* Operand can be either a namespace node or an operand descriptor */
358 switch (ACPI_GET_DESCRIPTOR_TYPE(obj_desc
)) {
359 case ACPI_DESC_TYPE_OPERAND
:
360 type
= obj_desc
->common
.type
;
363 case ACPI_DESC_TYPE_NAMED
:
364 type
= ((struct acpi_namespace_node
*)obj_desc
)->type
;
366 acpi_ns_get_attached_object((struct acpi_namespace_node
*)
369 /* If we had an Alias node, use the attached object for type info */
371 if (type
== ACPI_TYPE_LOCAL_ALIAS
) {
372 type
= ((struct acpi_namespace_node
*)obj_desc
)->type
;
374 acpi_ns_get_attached_object((struct
375 acpi_namespace_node
*)
381 return_ACPI_STATUS(AE_AML_OPERAND_TYPE
);
384 /* If type is anything other than a reference, we are done */
386 if (type
!= ACPI_TYPE_LOCAL_REFERENCE
) {
391 * For reference objects created via the ref_of or Index operators,
392 * we need to get to the base object (as per the ACPI specification
393 * of the object_type and size_of operators). This means traversing
394 * the list of possibly many nested references.
396 while (ACPI_GET_OBJECT_TYPE(obj_desc
) == ACPI_TYPE_LOCAL_REFERENCE
) {
397 switch (obj_desc
->reference
.opcode
) {
399 case AML_INT_NAMEPATH_OP
:
401 /* Dereference the reference pointer */
403 if (obj_desc
->reference
.opcode
== AML_REF_OF_OP
) {
404 node
= obj_desc
->reference
.object
;
405 } else { /* AML_INT_NAMEPATH_OP */
407 node
= obj_desc
->reference
.node
;
410 /* All "References" point to a NS node */
412 if (ACPI_GET_DESCRIPTOR_TYPE(node
) !=
413 ACPI_DESC_TYPE_NAMED
) {
414 ACPI_ERROR((AE_INFO
, "Not a NS node %p [%s]",
416 acpi_ut_get_descriptor_name(node
)));
417 return_ACPI_STATUS(AE_AML_INTERNAL
);
420 /* Get the attached object */
422 obj_desc
= acpi_ns_get_attached_object(node
);
425 /* No object, use the NS node type */
427 type
= acpi_ns_get_type(node
);
431 /* Check for circular references */
433 if (obj_desc
== operand
) {
434 return_ACPI_STATUS(AE_AML_CIRCULAR_REFERENCE
);
440 /* Get the type of this reference (index into another object) */
442 type
= obj_desc
->reference
.target_type
;
443 if (type
!= ACPI_TYPE_PACKAGE
) {
448 * The main object is a package, we want to get the type
449 * of the individual package element that is referenced by
452 * This could of course in turn be another reference object.
454 obj_desc
= *(obj_desc
->reference
.where
);
457 /* NULL package elements are allowed */
459 type
= 0; /* Uninitialized */
469 acpi_ds_method_data_get_value(obj_desc
->
477 if (ACPI_FAILURE(status
)) {
478 return_ACPI_STATUS(status
);
480 acpi_ut_remove_reference(obj_desc
);
483 acpi_ds_method_data_get_node(obj_desc
->
491 if (ACPI_FAILURE(status
)) {
492 return_ACPI_STATUS(status
);
495 obj_desc
= acpi_ns_get_attached_object(node
);
497 type
= ACPI_TYPE_ANY
;
505 /* The Debug Object is of type "DebugObject" */
507 type
= ACPI_TYPE_DEBUG_OBJECT
;
513 "Unknown Reference subtype %X",
514 obj_desc
->reference
.opcode
));
515 return_ACPI_STATUS(AE_AML_INTERNAL
);
520 * Now we are guaranteed to have an object that has not been created
521 * via the ref_of or Index operators.
523 type
= ACPI_GET_OBJECT_TYPE(obj_desc
);
526 /* Convert internal types to external types */
529 case ACPI_TYPE_LOCAL_REGION_FIELD
:
530 case ACPI_TYPE_LOCAL_BANK_FIELD
:
531 case ACPI_TYPE_LOCAL_INDEX_FIELD
:
533 type
= ACPI_TYPE_FIELD_UNIT
;
536 case ACPI_TYPE_LOCAL_SCOPE
:
538 /* Per ACPI Specification, Scope is untyped */
540 type
= ACPI_TYPE_ANY
;
544 /* No change to Type required */
550 *return_desc
= obj_desc
;
552 return_ACPI_STATUS(AE_OK
);