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1 : : // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 : : /******************************************************************************
3 : : *
4 : : * Module Name: dspkginit - Completion of deferred package initialization
5 : : *
6 : : * Copyright (C) 2000 - 2020, Intel Corp.
7 : : *
8 : : *****************************************************************************/
9 : :
10 : : #include <acpi/acpi.h>
11 : : #include "accommon.h"
12 : : #include "acnamesp.h"
13 : : #include "amlcode.h"
14 : : #include "acdispat.h"
15 : : #include "acinterp.h"
16 : : #include "acparser.h"
17 : :
18 : : #define _COMPONENT ACPI_NAMESPACE
19 : : ACPI_MODULE_NAME("dspkginit")
20 : :
21 : : /* Local prototypes */
22 : : static void
23 : : acpi_ds_resolve_package_element(union acpi_operand_object **element);
24 : :
25 : : /*******************************************************************************
26 : : *
27 : : * FUNCTION: acpi_ds_build_internal_package_obj
28 : : *
29 : : * PARAMETERS: walk_state - Current walk state
30 : : * op - Parser object to be translated
31 : : * element_count - Number of elements in the package - this is
32 : : * the num_elements argument to Package()
33 : : * obj_desc_ptr - Where the ACPI internal object is returned
34 : : *
35 : : * RETURN: Status
36 : : *
37 : : * DESCRIPTION: Translate a parser Op package object to the equivalent
38 : : * namespace object
39 : : *
40 : : * NOTE: The number of elements in the package will be always be the num_elements
41 : : * count, regardless of the number of elements in the package list. If
42 : : * num_elements is smaller, only that many package list elements are used.
43 : : * if num_elements is larger, the Package object is padded out with
44 : : * objects of type Uninitialized (as per ACPI spec.)
45 : : *
46 : : * Even though the ASL compilers do not allow num_elements to be smaller
47 : : * than the Package list length (for the fixed length package opcode), some
48 : : * BIOS code modifies the AML on the fly to adjust the num_elements, and
49 : : * this code compensates for that. This also provides compatibility with
50 : : * other AML interpreters.
51 : : *
52 : : ******************************************************************************/
53 : :
54 : : acpi_status
55 : 16179 : acpi_ds_build_internal_package_obj(struct acpi_walk_state *walk_state,
56 : : union acpi_parse_object *op,
57 : : u32 element_count,
58 : : union acpi_operand_object **obj_desc_ptr)
59 : : {
60 : 16179 : union acpi_parse_object *arg;
61 : 16179 : union acpi_parse_object *parent;
62 : 16179 : union acpi_operand_object *obj_desc = NULL;
63 : 16179 : acpi_status status = AE_OK;
64 : 16179 : u8 module_level_code = FALSE;
65 : 16179 : u16 reference_count;
66 : 16179 : u32 index;
67 : 16179 : u32 i;
68 : :
69 : 16179 : ACPI_FUNCTION_TRACE(ds_build_internal_package_obj);
70 : :
71 : : /* Check if we are executing module level code */
72 : :
73 [ + + ]: 16179 : if (walk_state->parse_flags & ACPI_PARSE_MODULE_LEVEL) {
74 : 312 : module_level_code = TRUE;
75 : : }
76 : :
77 : : /* Find the parent of a possibly nested package */
78 : :
79 : 16179 : parent = op->common.parent;
80 [ - + ]: 16179 : while ((parent->common.aml_opcode == AML_PACKAGE_OP) ||
81 : : (parent->common.aml_opcode == AML_VARIABLE_PACKAGE_OP)) {
82 : 0 : parent = parent->common.parent;
83 : : }
84 : :
85 : : /*
86 : : * If we are evaluating a Named package object of the form:
87 : : * Name (xxxx, Package)
88 : : * the package object already exists, otherwise it must be created.
89 : : */
90 : 16179 : obj_desc = *obj_desc_ptr;
91 [ + + ]: 16179 : if (!obj_desc) {
92 : 15867 : obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_PACKAGE);
93 : 15867 : *obj_desc_ptr = obj_desc;
94 [ + - ]: 15867 : if (!obj_desc) {
95 : : return_ACPI_STATUS(AE_NO_MEMORY);
96 : : }
97 : :
98 : 15867 : obj_desc->package.node = parent->common.node;
99 : : }
100 : :
101 [ + - ]: 16179 : if (obj_desc->package.flags & AOPOBJ_DATA_VALID) { /* Just in case */
102 : : return_ACPI_STATUS(AE_OK);
103 : : }
104 : :
105 : : /*
106 : : * Allocate the element array (array of pointers to the individual
107 : : * objects) if necessary. the count is based on the num_elements
108 : : * parameter. Add an extra pointer slot so that the list is always
109 : : * null terminated.
110 : : */
111 [ + - ]: 16179 : if (!obj_desc->package.elements) {
112 : 16179 : obj_desc->package.elements = ACPI_ALLOCATE_ZEROED(((acpi_size)
113 : : element_count
114 : : +
115 : : 1) *
116 : : sizeof(void
117 : : *));
118 : :
119 [ - + ]: 16179 : if (!obj_desc->package.elements) {
120 : 0 : acpi_ut_delete_object_desc(obj_desc);
121 : 0 : return_ACPI_STATUS(AE_NO_MEMORY);
122 : : }
123 : :
124 : 16179 : obj_desc->package.count = element_count;
125 : : }
126 : :
127 : : /* First arg is element count. Second arg begins the initializer list */
128 : :
129 : 16179 : arg = op->common.value.arg;
130 : 16179 : arg = arg->common.next;
131 : :
132 : : /*
133 : : * If we are executing module-level code, we will defer the
134 : : * full resolution of the package elements in order to support
135 : : * forward references from the elements. This provides
136 : : * compatibility with other ACPI implementations.
137 : : */
138 [ + + ]: 16179 : if (module_level_code) {
139 : 312 : obj_desc->package.aml_start = walk_state->aml;
140 : 312 : obj_desc->package.aml_length = 0;
141 : :
142 : : ACPI_DEBUG_PRINT_RAW((ACPI_DB_PARSE,
143 : : "%s: Deferring resolution of Package elements\n",
144 : : ACPI_GET_FUNCTION_NAME));
145 : : }
146 : :
147 : : /*
148 : : * Initialize the elements of the package, up to the num_elements count.
149 : : * Package is automatically padded with uninitialized (NULL) elements
150 : : * if num_elements is greater than the package list length. Likewise,
151 : : * Package is truncated if num_elements is less than the list length.
152 : : */
153 [ + + ]: 81339 : for (i = 0; arg && (i < element_count); i++) {
154 [ - + ]: 65160 : if (arg->common.aml_opcode == AML_INT_RETURN_VALUE_OP) {
155 [ # # ]: 0 : if (!arg->common.node) {
156 : : /*
157 : : * This is the case where an expression has returned a value.
158 : : * The use of expressions (term_args) within individual
159 : : * package elements is not supported by the AML interpreter,
160 : : * even though the ASL grammar supports it. Example:
161 : : *
162 : : * Name (INT1, 0x1234)
163 : : *
164 : : * Name (PKG3, Package () {
165 : : * Add (INT1, 0xAAAA0000)
166 : : * })
167 : : *
168 : : * 1) No known AML interpreter supports this type of construct
169 : : * 2) This fixes a fault if the construct is encountered
170 : : */
171 : 0 : ACPI_EXCEPTION((AE_INFO, AE_SUPPORT,
172 : : "Expressions within package elements are not supported"));
173 : :
174 : : /* Cleanup the return object, it is not needed */
175 : :
176 : 0 : acpi_ut_remove_reference(walk_state->results->
177 : : results.obj_desc[0]);
178 : 0 : return_ACPI_STATUS(AE_SUPPORT);
179 : : }
180 : :
181 [ # # ]: 0 : if (arg->common.node->type == ACPI_TYPE_METHOD) {
182 : : /*
183 : : * A method reference "looks" to the parser to be a method
184 : : * invocation, so we special case it here
185 : : */
186 : 0 : arg->common.aml_opcode = AML_INT_NAMEPATH_OP;
187 : 0 : status =
188 : 0 : acpi_ds_build_internal_object(walk_state,
189 : : arg,
190 : : &obj_desc->
191 : 0 : package.
192 : 0 : elements[i]);
193 : : } else {
194 : : /* This package element is already built, just get it */
195 : :
196 : 0 : obj_desc->package.elements[i] =
197 : : ACPI_CAST_PTR(union acpi_operand_object,
198 : : arg->common.node);
199 : : }
200 : : } else {
201 : 65160 : status =
202 : 65160 : acpi_ds_build_internal_object(walk_state, arg,
203 : 65160 : &obj_desc->package.
204 : 65160 : elements[i]);
205 [ - + ]: 65160 : if (status == AE_NOT_FOUND) {
206 : 0 : ACPI_ERROR((AE_INFO, "%-48s",
207 : : "****DS namepath not found"));
208 : : }
209 : :
210 [ + + ]: 65160 : if (!module_level_code) {
211 : : /*
212 : : * Initialize this package element. This function handles the
213 : : * resolution of named references within the package.
214 : : * Forward references from module-level code are deferred
215 : : * until all ACPI tables are loaded.
216 : : */
217 : 62976 : acpi_ds_init_package_element(0,
218 : : obj_desc->package.
219 : : elements[i], NULL,
220 : 62976 : &obj_desc->package.
221 : : elements[i]);
222 : : }
223 : : }
224 : :
225 [ + - ]: 65160 : if (*obj_desc_ptr) {
226 : :
227 : : /* Existing package, get existing reference count */
228 : :
229 : 65160 : reference_count =
230 : : (*obj_desc_ptr)->common.reference_count;
231 [ - + ]: 65160 : if (reference_count > 1) {
232 : :
233 : : /* Make new element ref count match original ref count */
234 : : /* TBD: Probably need an acpi_ut_add_references function */
235 : :
236 : 0 : for (index = 0;
237 [ # # ]: 0 : index < ((u32)reference_count - 1);
238 : 0 : index++) {
239 : 0 : acpi_ut_add_reference((obj_desc->
240 : 0 : package.
241 : 0 : elements[i]));
242 : : }
243 : : }
244 : : }
245 : :
246 : 65160 : arg = arg->common.next;
247 : : }
248 : :
249 : : /* Check for match between num_elements and actual length of package_list */
250 : :
251 [ - + ]: 16179 : if (arg) {
252 : : /*
253 : : * num_elements was exhausted, but there are remaining elements in
254 : : * the package_list. Truncate the package to num_elements.
255 : : *
256 : : * Note: technically, this is an error, from ACPI spec: "It is an
257 : : * error for NumElements to be less than the number of elements in
258 : : * the PackageList". However, we just print a message and no
259 : : * exception is returned. This provides compatibility with other
260 : : * ACPI implementations. Some firmware implementations will alter
261 : : * the num_elements on the fly, possibly creating this type of
262 : : * ill-formed package object.
263 : : */
264 [ # # ]: 0 : while (arg) {
265 : : /*
266 : : * We must delete any package elements that were created earlier
267 : : * and are not going to be used because of the package truncation.
268 : : */
269 [ # # ]: 0 : if (arg->common.node) {
270 : 0 : acpi_ut_remove_reference(ACPI_CAST_PTR
271 : : (union
272 : : acpi_operand_object,
273 : : arg->common.node));
274 : 0 : arg->common.node = NULL;
275 : : }
276 : :
277 : : /* Find out how many elements there really are */
278 : :
279 : 0 : i++;
280 : 0 : arg = arg->common.next;
281 : : }
282 : :
283 : 0 : ACPI_INFO(("Actual Package length (%u) is larger than "
284 : : "NumElements field (%u), truncated",
285 : : i, element_count));
286 : : } else if (i < element_count) {
287 : : /*
288 : : * Arg list (elements) was exhausted, but we did not reach
289 : : * num_elements count.
290 : : *
291 : : * Note: this is not an error, the package is padded out
292 : : * with NULLs as per the ACPI specification.
293 : : */
294 : : ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
295 : : "%s: Package List length (%u) smaller than NumElements "
296 : : "count (%u), padded with null elements\n",
297 : : ACPI_GET_FUNCTION_NAME, i,
298 : 16179 : element_count));
299 : : }
300 : :
301 : : /* Module-level packages will be resolved later */
302 : :
303 [ + + ]: 16179 : if (!module_level_code) {
304 : 15867 : obj_desc->package.flags |= AOPOBJ_DATA_VALID;
305 : : }
306 : :
307 : 16179 : op->common.node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_desc);
308 : 16179 : return_ACPI_STATUS(status);
309 : : }
310 : :
311 : : /*******************************************************************************
312 : : *
313 : : * FUNCTION: acpi_ds_init_package_element
314 : : *
315 : : * PARAMETERS: acpi_pkg_callback
316 : : *
317 : : * RETURN: Status
318 : : *
319 : : * DESCRIPTION: Resolve a named reference element within a package object
320 : : *
321 : : ******************************************************************************/
322 : :
323 : : acpi_status
324 : 65160 : acpi_ds_init_package_element(u8 object_type,
325 : : union acpi_operand_object *source_object,
326 : : union acpi_generic_state *state, void *context)
327 : : {
328 : 65160 : union acpi_operand_object **element_ptr;
329 : :
330 : 65160 : ACPI_FUNCTION_TRACE(ds_init_package_element);
331 : :
332 [ + - ]: 65160 : if (!source_object) {
333 : : return_ACPI_STATUS(AE_OK);
334 : : }
335 : :
336 : : /*
337 : : * The following code is a bit of a hack to workaround a (current)
338 : : * limitation of the acpi_pkg_callback interface. We need a pointer
339 : : * to the location within the element array because a new object
340 : : * may be created and stored there.
341 : : */
342 [ + + ]: 65160 : if (context) {
343 : :
344 : : /* A direct call was made to this function */
345 : :
346 : : element_ptr = (union acpi_operand_object **)context;
347 : : } else {
348 : : /* Call came from acpi_ut_walk_package_tree */
349 : :
350 : 2184 : element_ptr = state->pkg.this_target_obj;
351 : : }
352 : :
353 : : /* We are only interested in reference objects/elements */
354 : :
355 [ + + ]: 65160 : if (source_object->common.type == ACPI_TYPE_LOCAL_REFERENCE) {
356 : :
357 : : /* Attempt to resolve the (named) reference to a namespace node */
358 : :
359 : 15744 : acpi_ds_resolve_package_element(element_ptr);
360 [ - + ]: 49416 : } else if (source_object->common.type == ACPI_TYPE_PACKAGE) {
361 : 0 : source_object->package.flags |= AOPOBJ_DATA_VALID;
362 : : }
363 : :
364 : : return_ACPI_STATUS(AE_OK);
365 : : }
366 : :
367 : : /*******************************************************************************
368 : : *
369 : : * FUNCTION: acpi_ds_resolve_package_element
370 : : *
371 : : * PARAMETERS: element_ptr - Pointer to a reference object
372 : : *
373 : : * RETURN: Possible new element is stored to the indirect element_ptr
374 : : *
375 : : * DESCRIPTION: Resolve a package element that is a reference to a named
376 : : * object.
377 : : *
378 : : ******************************************************************************/
379 : :
380 : : static void
381 : 15744 : acpi_ds_resolve_package_element(union acpi_operand_object **element_ptr)
382 : : {
383 : 15744 : acpi_status status;
384 : 15744 : acpi_status status2;
385 : 15744 : union acpi_generic_state scope_info;
386 : 15744 : union acpi_operand_object *element = *element_ptr;
387 : 15744 : struct acpi_namespace_node *resolved_node;
388 : 15744 : struct acpi_namespace_node *original_node;
389 : 15744 : char *external_path = "";
390 : 15744 : acpi_object_type type;
391 : :
392 : 15744 : ACPI_FUNCTION_TRACE(ds_resolve_package_element);
393 : :
394 : : /* Check if reference element is already resolved */
395 : :
396 [ + - ]: 15744 : if (element->reference.resolved) {
397 : : ACPI_DEBUG_PRINT_RAW((ACPI_DB_PARSE,
398 : : "%s: Package element is already resolved\n",
399 : : ACPI_GET_FUNCTION_NAME));
400 : :
401 : : return_VOID;
402 : : }
403 : :
404 : : /* Element must be a reference object of correct type */
405 : :
406 : 15744 : scope_info.scope.node = element->reference.node; /* Prefix node */
407 : :
408 : 15744 : status = acpi_ns_lookup(&scope_info, (char *)element->reference.aml,
409 : : ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
410 : : ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE,
411 : : NULL, &resolved_node);
412 [ - + ]: 15744 : if (ACPI_FAILURE(status)) {
413 [ # # ]: 0 : if ((status == AE_NOT_FOUND)
414 [ # # ]: 0 : && acpi_gbl_ignore_package_resolution_errors) {
415 : : /*
416 : : * Optionally be silent about the NOT_FOUND case for the referenced
417 : : * name. Although this is potentially a serious problem,
418 : : * it can generate a lot of noise/errors on platforms whose
419 : : * firmware carries around a bunch of unused Package objects.
420 : : * To disable these errors, set this global to TRUE:
421 : : * acpi_gbl_ignore_package_resolution_errors
422 : : *
423 : : * If the AML actually tries to use such a package, the unresolved
424 : : * element(s) will be replaced with NULL elements.
425 : : */
426 : :
427 : : /* Referenced name not found, set the element to NULL */
428 : :
429 : 0 : acpi_ut_remove_reference(*element_ptr);
430 : 0 : *element_ptr = NULL;
431 : 0 : return_VOID;
432 : : }
433 : :
434 : 0 : status2 = acpi_ns_externalize_name(ACPI_UINT32_MAX,
435 : 0 : (char *)element->reference.
436 : : aml, NULL, &external_path);
437 : :
438 : 0 : ACPI_EXCEPTION((AE_INFO, status,
439 : : "While resolving a named reference package element - %s",
440 : : external_path));
441 [ # # ]: 0 : if (ACPI_SUCCESS(status2)) {
442 : 0 : ACPI_FREE(external_path);
443 : : }
444 : :
445 : : /* Could not resolve name, set the element to NULL */
446 : :
447 : 0 : acpi_ut_remove_reference(*element_ptr);
448 : 0 : *element_ptr = NULL;
449 : 0 : return_VOID;
450 [ - + ]: 15744 : } else if (resolved_node->type == ACPI_TYPE_ANY) {
451 : :
452 : : /* Named reference not resolved, return a NULL package element */
453 : :
454 : 0 : ACPI_ERROR((AE_INFO,
455 : : "Could not resolve named package element [%4.4s] in [%4.4s]",
456 : : resolved_node->name.ascii,
457 : : scope_info.scope.node->name.ascii));
458 : 0 : *element_ptr = NULL;
459 : 0 : return_VOID;
460 : : }
461 : :
462 : : /*
463 : : * Special handling for Alias objects. We need resolved_node to point
464 : : * to the Alias target. This effectively "resolves" the alias.
465 : : */
466 [ - + ]: 15744 : if (resolved_node->type == ACPI_TYPE_LOCAL_ALIAS) {
467 : 0 : resolved_node = ACPI_CAST_PTR(struct acpi_namespace_node,
468 : : resolved_node->object);
469 : : }
470 : :
471 : : /* Update the reference object */
472 : :
473 : 15744 : element->reference.resolved = TRUE;
474 : 15744 : element->reference.node = resolved_node;
475 : 15744 : type = element->reference.node->type;
476 : :
477 : : /*
478 : : * Attempt to resolve the node to a value before we insert it into
479 : : * the package. If this is a reference to a common data type,
480 : : * resolve it immediately. According to the ACPI spec, package
481 : : * elements can only be "data objects" or method references.
482 : : * Attempt to resolve to an Integer, Buffer, String or Package.
483 : : * If cannot, return the named reference (for things like Devices,
484 : : * Methods, etc.) Buffer Fields and Fields will resolve to simple
485 : : * objects (int/buf/str/pkg).
486 : : *
487 : : * NOTE: References to things like Devices, Methods, Mutexes, etc.
488 : : * will remain as named references. This behavior is not described
489 : : * in the ACPI spec, but it appears to be an oversight.
490 : : */
491 : 15744 : original_node = resolved_node;
492 : 15744 : status = acpi_ex_resolve_node_to_value(&resolved_node, NULL);
493 [ + - ]: 15744 : if (ACPI_FAILURE(status)) {
494 : : return_VOID;
495 : : }
496 : :
497 [ - - + ]: 15744 : switch (type) {
498 : : /*
499 : : * These object types are a result of named references, so we will
500 : : * leave them as reference objects. In other words, these types
501 : : * have no intrinsic "value".
502 : : */
503 : : case ACPI_TYPE_DEVICE:
504 : : case ACPI_TYPE_THERMAL:
505 : : case ACPI_TYPE_METHOD:
506 : : break;
507 : :
508 : 0 : case ACPI_TYPE_MUTEX:
509 : : case ACPI_TYPE_POWER:
510 : : case ACPI_TYPE_PROCESSOR:
511 : : case ACPI_TYPE_EVENT:
512 : : case ACPI_TYPE_REGION:
513 : :
514 : : /* acpi_ex_resolve_node_to_value gave these an extra reference */
515 : :
516 : 0 : acpi_ut_remove_reference(original_node->object);
517 : 0 : break;
518 : :
519 : 0 : default:
520 : : /*
521 : : * For all other types - the node was resolved to an actual
522 : : * operand object with a value, return the object. Remove
523 : : * a reference on the existing object.
524 : : */
525 : 0 : acpi_ut_remove_reference(element);
526 : 0 : *element_ptr = (union acpi_operand_object *)resolved_node;
527 : 0 : break;
528 : : }
529 : :
530 : : return_VOID;
531 : : }
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