1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 /******************************************************************************
3 *
4 * Module Name: dsobject - Dispatcher object management routines
5 *
6 * Copyright (C) 2000 - 2019, Intel Corp.
7 *
8 *****************************************************************************/
9
10 #include <acpi/acpi.h>
11 #include "accommon.h"
12 #include "acparser.h"
13 #include "amlcode.h"
14 #include "acdispat.h"
15 #include "acnamesp.h"
16 #include "acinterp.h"
17
18 #define _COMPONENT ACPI_DISPATCHER
19 ACPI_MODULE_NAME("dsobject")
20
21 /*******************************************************************************
22 *
23 * FUNCTION: acpi_ds_build_internal_object
24 *
25 * PARAMETERS: walk_state - Current walk state
26 * op - Parser object to be translated
27 * obj_desc_ptr - Where the ACPI internal object is returned
28 *
29 * RETURN: Status
30 *
31 * DESCRIPTION: Translate a parser Op object to the equivalent namespace object
32 * Simple objects are any objects other than a package object!
33 *
34 ******************************************************************************/
35 acpi_status
36 acpi_ds_build_internal_object(struct acpi_walk_state *walk_state,
37 union acpi_parse_object *op,
38 union acpi_operand_object **obj_desc_ptr)
39 {
40 union acpi_operand_object *obj_desc;
41 acpi_status status;
42
43 ACPI_FUNCTION_TRACE(ds_build_internal_object);
44
45 *obj_desc_ptr = NULL;
46 if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) {
47 /*
48 * This is a named object reference. If this name was
49 * previously looked up in the namespace, it was stored in
50 * this op. Otherwise, go ahead and look it up now
51 */
52 if (!op->common.node) {
53
54 /* Check if we are resolving a named reference within a package */
55
56 if ((op->common.parent->common.aml_opcode ==
57 AML_PACKAGE_OP)
58 || (op->common.parent->common.aml_opcode ==
59 AML_VARIABLE_PACKAGE_OP)) {
60 /*
61 * We won't resolve package elements here, we will do this
62 * after all ACPI tables are loaded into the namespace. This
63 * behavior supports both forward references to named objects
64 * and external references to objects in other tables.
65 */
66 goto create_new_object;
67 } else {
68 status = acpi_ns_lookup(walk_state->scope_info,
69 op->common.value.string,
70 ACPI_TYPE_ANY,
71 ACPI_IMODE_EXECUTE,
72 ACPI_NS_SEARCH_PARENT |
73 ACPI_NS_DONT_OPEN_SCOPE,
74 NULL,
75 ACPI_CAST_INDIRECT_PTR
76 (struct
77 acpi_namespace_node,
78 &(op->common.node)));
79 if (ACPI_FAILURE(status)) {
80 ACPI_ERROR_NAMESPACE(walk_state->
81 scope_info,
82 op->common.value.
83 string, status);
84 return_ACPI_STATUS(status);
85 }
86 }
87 }
88 }
89
90 create_new_object:
91
92 /* Create and init a new internal ACPI object */
93
94 obj_desc = acpi_ut_create_internal_object((acpi_ps_get_opcode_info
95 (op->common.aml_opcode))->
96 object_type);
97 if (!obj_desc) {
98 return_ACPI_STATUS(AE_NO_MEMORY);
99 }
100
101 status =
102 acpi_ds_init_object_from_op(walk_state, op, op->common.aml_opcode,
103 &obj_desc);
104 if (ACPI_FAILURE(status)) {
105 acpi_ut_remove_reference(obj_desc);
106 return_ACPI_STATUS(status);
107 }
108
109 /*
110 * Handling for unresolved package reference elements.
111 * These are elements that are namepaths.
112 */
113 if ((op->common.parent->common.aml_opcode == AML_PACKAGE_OP) ||
114 (op->common.parent->common.aml_opcode == AML_VARIABLE_PACKAGE_OP)) {
115 obj_desc->reference.resolved = TRUE;
116
117 if ((op->common.aml_opcode == AML_INT_NAMEPATH_OP) &&
118 !obj_desc->reference.node) {
119 /*
120 * Name was unresolved above.
121 * Get the prefix node for later lookup
122 */
123 obj_desc->reference.node =
124 walk_state->scope_info->scope.node;
125 obj_desc->reference.aml = op->common.aml;
126 obj_desc->reference.resolved = FALSE;
127 }
128 }
129
130 *obj_desc_ptr = obj_desc;
131 return_ACPI_STATUS(status);
132 }
133
134 /*******************************************************************************
135 *
136 * FUNCTION: acpi_ds_build_internal_buffer_obj
137 *
138 * PARAMETERS: walk_state - Current walk state
139 * op - Parser object to be translated
140 * buffer_length - Length of the buffer
141 * obj_desc_ptr - Where the ACPI internal object is returned
142 *
143 * RETURN: Status
144 *
145 * DESCRIPTION: Translate a parser Op package object to the equivalent
146 * namespace object
147 *
148 ******************************************************************************/
149
150 acpi_status
151 acpi_ds_build_internal_buffer_obj(struct acpi_walk_state *walk_state,
152 union acpi_parse_object *op,
153 u32 buffer_length,
154 union acpi_operand_object **obj_desc_ptr)
155 {
156 union acpi_parse_object *arg;
157 union acpi_operand_object *obj_desc;
158 union acpi_parse_object *byte_list;
159 u32 byte_list_length = 0;
160
161 ACPI_FUNCTION_TRACE(ds_build_internal_buffer_obj);
162
163 /*
164 * If we are evaluating a Named buffer object "Name (xxxx, Buffer)".
165 * The buffer object already exists (from the NS node), otherwise it must
166 * be created.
167 */
168 obj_desc = *obj_desc_ptr;
169 if (!obj_desc) {
170
171 /* Create a new buffer object */
172
173 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER);
174 *obj_desc_ptr = obj_desc;
175 if (!obj_desc) {
176 return_ACPI_STATUS(AE_NO_MEMORY);
177 }
178 }
179
180 /*
181 * Second arg is the buffer data (optional) byte_list can be either
182 * individual bytes or a string initializer. In either case, a
183 * byte_list appears in the AML.
184 */
185 arg = op->common.value.arg; /* skip first arg */
186
187 byte_list = arg->named.next;
188 if (byte_list) {
189 if (byte_list->common.aml_opcode != AML_INT_BYTELIST_OP) {
190 ACPI_ERROR((AE_INFO,
191 "Expecting bytelist, found AML opcode 0x%X in op %p",
192 byte_list->common.aml_opcode, byte_list));
193
194 acpi_ut_remove_reference(obj_desc);
195 return (AE_TYPE);
196 }
197
198 byte_list_length = (u32) byte_list->common.value.integer;
199 }
200
201 /*
202 * The buffer length (number of bytes) will be the larger of:
203 * 1) The specified buffer length and
204 * 2) The length of the initializer byte list
205 */
206 obj_desc->buffer.length = buffer_length;
207 if (byte_list_length > buffer_length) {
208 obj_desc->buffer.length = byte_list_length;
209 }
210
211 /* Allocate the buffer */
212
213 if (obj_desc->buffer.length == 0) {
214 obj_desc->buffer.pointer = NULL;
215 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
216 "Buffer defined with zero length in AML, creating\n"));
217 } else {
218 obj_desc->buffer.pointer =
219 ACPI_ALLOCATE_ZEROED(obj_desc->buffer.length);
220 if (!obj_desc->buffer.pointer) {
221 acpi_ut_delete_object_desc(obj_desc);
222 return_ACPI_STATUS(AE_NO_MEMORY);
223 }
224
225 /* Initialize buffer from the byte_list (if present) */
226
227 if (byte_list) {
228 memcpy(obj_desc->buffer.pointer, byte_list->named.data,
229 byte_list_length);
230 }
231 }
232
233 obj_desc->buffer.flags |= AOPOBJ_DATA_VALID;
234 op->common.node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_desc);
235 return_ACPI_STATUS(AE_OK);
236 }
237
238 /*******************************************************************************
239 *
240 * FUNCTION: acpi_ds_create_node
241 *
242 * PARAMETERS: walk_state - Current walk state
243 * node - NS Node to be initialized
244 * op - Parser object to be translated
245 *
246 * RETURN: Status
247 *
248 * DESCRIPTION: Create the object to be associated with a namespace node
249 *
250 ******************************************************************************/
251
252 acpi_status
253 acpi_ds_create_node(struct acpi_walk_state *walk_state,
254 struct acpi_namespace_node *node,
255 union acpi_parse_object *op)
256 {
257 acpi_status status;
258 union acpi_operand_object *obj_desc;
259
260 ACPI_FUNCTION_TRACE_PTR(ds_create_node, op);
261
262 /*
263 * Because of the execution pass through the non-control-method
264 * parts of the table, we can arrive here twice. Only init
265 * the named object node the first time through
266 */
267 if (acpi_ns_get_attached_object(node)) {
268 return_ACPI_STATUS(AE_OK);
269 }
270
271 if (!op->common.value.arg) {
272
273 /* No arguments, there is nothing to do */
274
275 return_ACPI_STATUS(AE_OK);
276 }
277
278 /* Build an internal object for the argument(s) */
279
280 status =
281 acpi_ds_build_internal_object(walk_state, op->common.value.arg,
282 &obj_desc);
283 if (ACPI_FAILURE(status)) {
284 return_ACPI_STATUS(status);
285 }
286
287 /* Re-type the object according to its argument */
288
289 node->type = obj_desc->common.type;
290
291 /* Attach obj to node */
292
293 status = acpi_ns_attach_object(node, obj_desc, node->type);
294
295 /* Remove local reference to the object */
296
297 acpi_ut_remove_reference(obj_desc);
298 return_ACPI_STATUS(status);
299 }
300
301 /*******************************************************************************
302 *
303 * FUNCTION: acpi_ds_init_object_from_op
304 *
305 * PARAMETERS: walk_state - Current walk state
306 * op - Parser op used to init the internal object
307 * opcode - AML opcode associated with the object
308 * ret_obj_desc - Namespace object to be initialized
309 *
310 * RETURN: Status
311 *
312 * DESCRIPTION: Initialize a namespace object from a parser Op and its
313 * associated arguments. The namespace object is a more compact
314 * representation of the Op and its arguments.
315 *
316 ******************************************************************************/
317
318 acpi_status
319 acpi_ds_init_object_from_op(struct acpi_walk_state *walk_state,
320 union acpi_parse_object *op,
321 u16 opcode,
322 union acpi_operand_object **ret_obj_desc)
323 {
324 const struct acpi_opcode_info *op_info;
325 union acpi_operand_object *obj_desc;
326 acpi_status status = AE_OK;
327
328 ACPI_FUNCTION_TRACE(ds_init_object_from_op);
329
330 obj_desc = *ret_obj_desc;
331 op_info = acpi_ps_get_opcode_info(opcode);
332 if (op_info->class == AML_CLASS_UNKNOWN) {
333
334 /* Unknown opcode */
335
336 return_ACPI_STATUS(AE_TYPE);
337 }
338
339 /* Perform per-object initialization */
340
341 switch (obj_desc->common.type) {
342 case ACPI_TYPE_BUFFER:
343 /*
344 * Defer evaluation of Buffer term_arg operand
345 */
346 obj_desc->buffer.node =
347 ACPI_CAST_PTR(struct acpi_namespace_node,
348 walk_state->operands[0]);
349 obj_desc->buffer.aml_start = op->named.data;
350 obj_desc->buffer.aml_length = op->named.length;
351 break;
352
353 case ACPI_TYPE_PACKAGE:
354 /*
355 * Defer evaluation of Package term_arg operand and all
356 * package elements. (01/2017): We defer the element
357 * resolution to allow forward references from the package
358 * in order to provide compatibility with other ACPI
359 * implementations.
360 */
361 obj_desc->package.node =
362 ACPI_CAST_PTR(struct acpi_namespace_node,
363 walk_state->operands[0]);
364
365 if (!op->named.data) {
366 return_ACPI_STATUS(AE_OK);
367 }
368
369 obj_desc->package.aml_start = op->named.data;
370 obj_desc->package.aml_length = op->named.length;
371 break;
372
373 case ACPI_TYPE_INTEGER:
374
375 switch (op_info->type) {
376 case AML_TYPE_CONSTANT:
377 /*
378 * Resolve AML Constants here - AND ONLY HERE!
379 * All constants are integers.
380 * We mark the integer with a flag that indicates that it started
381 * life as a constant -- so that stores to constants will perform
382 * as expected (noop). zero_op is used as a placeholder for optional
383 * target operands.
384 */
385 obj_desc->common.flags = AOPOBJ_AML_CONSTANT;
386
387 switch (opcode) {
388 case AML_ZERO_OP:
389
390 obj_desc->integer.value = 0;
391 break;
392
393 case AML_ONE_OP:
394
395 obj_desc->integer.value = 1;
396 break;
397
398 case AML_ONES_OP:
399
400 obj_desc->integer.value = ACPI_UINT64_MAX;
401
402 /* Truncate value if we are executing from a 32-bit ACPI table */
403
404 (void)acpi_ex_truncate_for32bit_table(obj_desc);
405 break;
406
407 case AML_REVISION_OP:
408
409 obj_desc->integer.value = ACPI_CA_VERSION;
410 break;
411
412 default:
413
414 ACPI_ERROR((AE_INFO,
415 "Unknown constant opcode 0x%X",
416 opcode));
417 status = AE_AML_OPERAND_TYPE;
418 break;
419 }
420 break;
421
422 case AML_TYPE_LITERAL:
423
424 obj_desc->integer.value = op->common.value.integer;
425
426 if (acpi_ex_truncate_for32bit_table(obj_desc)) {
427
428 /* Warn if we found a 64-bit constant in a 32-bit table */
429
430 ACPI_WARNING((AE_INFO,
431 "Truncated 64-bit constant found in 32-bit table: %8.8X%8.8X => %8.8X",
432 ACPI_FORMAT_UINT64(op->common.
433 value.integer),
434 (u32)obj_desc->integer.value));
435 }
436 break;
437
438 default:
439
440 ACPI_ERROR((AE_INFO, "Unknown Integer type 0x%X",
441 op_info->type));
442 status = AE_AML_OPERAND_TYPE;
443 break;
444 }
445 break;
446
447 case ACPI_TYPE_STRING:
448
449 obj_desc->string.pointer = op->common.value.string;
450 obj_desc->string.length = (u32)strlen(op->common.value.string);
451
452 /*
453 * The string is contained in the ACPI table, don't ever try
454 * to delete it
455 */
456 obj_desc->common.flags |= AOPOBJ_STATIC_POINTER;
457 break;
458
459 case ACPI_TYPE_METHOD:
460 break;
461
462 case ACPI_TYPE_LOCAL_REFERENCE:
463
464 switch (op_info->type) {
465 case AML_TYPE_LOCAL_VARIABLE:
466
467 /* Local ID (0-7) is (AML opcode - base AML_FIRST_LOCAL_OP) */
468
469 obj_desc->reference.value =
470 ((u32)opcode) - AML_FIRST_LOCAL_OP;
471 obj_desc->reference.class = ACPI_REFCLASS_LOCAL;
472
473 status =
474 acpi_ds_method_data_get_node(ACPI_REFCLASS_LOCAL,
475 obj_desc->reference.
476 value, walk_state,
477 ACPI_CAST_INDIRECT_PTR
478 (struct
479 acpi_namespace_node,
480 &obj_desc->reference.
481 object));
482 break;
483
484 case AML_TYPE_METHOD_ARGUMENT:
485
486 /* Arg ID (0-6) is (AML opcode - base AML_FIRST_ARG_OP) */
487
488 obj_desc->reference.value =
489 ((u32)opcode) - AML_FIRST_ARG_OP;
490 obj_desc->reference.class = ACPI_REFCLASS_ARG;
491
492 status = acpi_ds_method_data_get_node(ACPI_REFCLASS_ARG,
493 obj_desc->
494 reference.value,
495 walk_state,
496 ACPI_CAST_INDIRECT_PTR
497 (struct
498 acpi_namespace_node,
499 &obj_desc->
500 reference.
501 object));
502 break;
503
504 default: /* Object name or Debug object */
505
506 switch (op->common.aml_opcode) {
507 case AML_INT_NAMEPATH_OP:
508
509 /* Node was saved in Op */
510
511 obj_desc->reference.node = op->common.node;
512 obj_desc->reference.class = ACPI_REFCLASS_NAME;
513 if (op->common.node) {
514 obj_desc->reference.object =
515 op->common.node->object;
516 }
517 break;
518
519 case AML_DEBUG_OP:
520
521 obj_desc->reference.class = ACPI_REFCLASS_DEBUG;
522 break;
523
524 default:
525
526 ACPI_ERROR((AE_INFO,
527 "Unimplemented reference type for AML opcode: 0x%4.4X",
528 opcode));
529 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
530 }
531 break;
532 }
533 break;
534
535 default:
536
537 ACPI_ERROR((AE_INFO, "Unimplemented data type: 0x%X",
538 obj_desc->common.type));
539
540 status = AE_AML_OPERAND_TYPE;
541 break;
542 }
543
544 return_ACPI_STATUS(status);
545 }