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1/******************************************************************************
2 *
3 * Module Name: nsconvert - Object conversions for objects returned by
4 * predefined methods
5 *
6 *****************************************************************************/
7
8/*
9 * Copyright (C) 2000 - 2016, Intel Corp.
10 * All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions, and the following disclaimer,
17 * without modification.
18 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
19 * substantially similar to the "NO WARRANTY" disclaimer below
20 * ("Disclaimer") and any redistribution must be conditioned upon
21 * including a substantially similar Disclaimer requirement for further
22 * binary redistribution.
23 * 3. Neither the names of the above-listed copyright holders nor the names
24 * of any contributors may be used to endorse or promote products derived
25 * from this software without specific prior written permission.
26 *
27 * Alternatively, this software may be distributed under the terms of the
28 * GNU General Public License ("GPL") version 2 as published by the Free
29 * Software Foundation.
30 *
31 * NO WARRANTY
32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
35 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
36 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
41 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
42 * POSSIBILITY OF SUCH DAMAGES.
43 */
44
45#include <acpi/acpi.h>
46#include "accommon.h"
47#include "acnamesp.h"
48#include "acinterp.h"
49#include "acpredef.h"
50#include "amlresrc.h"
51
52#define _COMPONENT ACPI_NAMESPACE
53ACPI_MODULE_NAME("nsconvert")
54
55/*******************************************************************************
56 *
57 * FUNCTION: acpi_ns_convert_to_integer
58 *
59 * PARAMETERS: original_object - Object to be converted
60 * return_object - Where the new converted object is returned
61 *
62 * RETURN: Status. AE_OK if conversion was successful.
63 *
64 * DESCRIPTION: Attempt to convert a String/Buffer object to an Integer.
65 *
66 ******************************************************************************/
67acpi_status
68acpi_ns_convert_to_integer(union acpi_operand_object *original_object,
69 union acpi_operand_object **return_object)
70{
71 union acpi_operand_object *new_object;
72 acpi_status status;
73 u64 value = 0;
74 u32 i;
75
76 switch (original_object->common.type) {
77 case ACPI_TYPE_STRING:
78
79 /* String-to-Integer conversion */
80
81 status = acpi_ut_strtoul64(original_object->string.pointer,
82 ACPI_ANY_BASE, &value);
83 if (ACPI_FAILURE(status)) {
84 return (status);
85 }
86 break;
87
88 case ACPI_TYPE_BUFFER:
89
90 /* Buffer-to-Integer conversion. Max buffer size is 64 bits. */
91
92 if (original_object->buffer.length > 8) {
93 return (AE_AML_OPERAND_TYPE);
94 }
95
96 /* Extract each buffer byte to create the integer */
97
98 for (i = 0; i < original_object->buffer.length; i++) {
99 value |= ((u64)
100 original_object->buffer.pointer[i] << (i *
101 8));
102 }
103 break;
104
105 default:
106
107 return (AE_AML_OPERAND_TYPE);
108 }
109
110 new_object = acpi_ut_create_integer_object(value);
111 if (!new_object) {
112 return (AE_NO_MEMORY);
113 }
114
115 *return_object = new_object;
116 return (AE_OK);
117}
118
119/*******************************************************************************
120 *
121 * FUNCTION: acpi_ns_convert_to_string
122 *
123 * PARAMETERS: original_object - Object to be converted
124 * return_object - Where the new converted object is returned
125 *
126 * RETURN: Status. AE_OK if conversion was successful.
127 *
128 * DESCRIPTION: Attempt to convert a Integer/Buffer object to a String.
129 *
130 ******************************************************************************/
131
132acpi_status
133acpi_ns_convert_to_string(union acpi_operand_object *original_object,
134 union acpi_operand_object **return_object)
135{
136 union acpi_operand_object *new_object;
137 acpi_size length;
138 acpi_status status;
139
140 switch (original_object->common.type) {
141 case ACPI_TYPE_INTEGER:
142 /*
143 * Integer-to-String conversion. Commonly, convert
144 * an integer of value 0 to a NULL string. The last element of
145 * _BIF and _BIX packages occasionally need this fix.
146 */
147 if (original_object->integer.value == 0) {
148
149 /* Allocate a new NULL string object */
150
151 new_object = acpi_ut_create_string_object(0);
152 if (!new_object) {
153 return (AE_NO_MEMORY);
154 }
155 } else {
156 status = acpi_ex_convert_to_string(original_object,
157 &new_object,
158 ACPI_IMPLICIT_CONVERT_HEX);
159 if (ACPI_FAILURE(status)) {
160 return (status);
161 }
162 }
163 break;
164
165 case ACPI_TYPE_BUFFER:
166 /*
167 * Buffer-to-String conversion. Use a to_string
168 * conversion, no transform performed on the buffer data. The best
169 * example of this is the _BIF method, where the string data from
170 * the battery is often (incorrectly) returned as buffer object(s).
171 */
172 length = 0;
173 while ((length < original_object->buffer.length) &&
174 (original_object->buffer.pointer[length])) {
175 length++;
176 }
177
178 /* Allocate a new string object */
179
180 new_object = acpi_ut_create_string_object(length);
181 if (!new_object) {
182 return (AE_NO_MEMORY);
183 }
184
185 /*
186 * Copy the raw buffer data with no transform. String is already NULL
187 * terminated at Length+1.
188 */
189 memcpy(new_object->string.pointer,
190 original_object->buffer.pointer, length);
191 break;
192
193 default:
194
195 return (AE_AML_OPERAND_TYPE);
196 }
197
198 *return_object = new_object;
199 return (AE_OK);
200}
201
202/*******************************************************************************
203 *
204 * FUNCTION: acpi_ns_convert_to_buffer
205 *
206 * PARAMETERS: original_object - Object to be converted
207 * return_object - Where the new converted object is returned
208 *
209 * RETURN: Status. AE_OK if conversion was successful.
210 *
211 * DESCRIPTION: Attempt to convert a Integer/String/Package object to a Buffer.
212 *
213 ******************************************************************************/
214
215acpi_status
216acpi_ns_convert_to_buffer(union acpi_operand_object *original_object,
217 union acpi_operand_object **return_object)
218{
219 union acpi_operand_object *new_object;
220 acpi_status status;
221 union acpi_operand_object **elements;
222 u32 *dword_buffer;
223 u32 count;
224 u32 i;
225
226 switch (original_object->common.type) {
227 case ACPI_TYPE_INTEGER:
228 /*
229 * Integer-to-Buffer conversion.
230 * Convert the Integer to a packed-byte buffer. _MAT and other
231 * objects need this sometimes, if a read has been performed on a
232 * Field object that is less than or equal to the global integer
233 * size (32 or 64 bits).
234 */
235 status =
236 acpi_ex_convert_to_buffer(original_object, &new_object);
237 if (ACPI_FAILURE(status)) {
238 return (status);
239 }
240 break;
241
242 case ACPI_TYPE_STRING:
243
244 /* String-to-Buffer conversion. Simple data copy */
245
246 new_object = acpi_ut_create_buffer_object
247 (original_object->string.length);
248 if (!new_object) {
249 return (AE_NO_MEMORY);
250 }
251
252 memcpy(new_object->buffer.pointer,
253 original_object->string.pointer,
254 original_object->string.length);
255 break;
256
257 case ACPI_TYPE_PACKAGE:
258 /*
259 * This case is often seen for predefined names that must return a
260 * Buffer object with multiple DWORD integers within. For example,
261 * _FDE and _GTM. The Package can be converted to a Buffer.
262 */
263
264 /* All elements of the Package must be integers */
265
266 elements = original_object->package.elements;
267 count = original_object->package.count;
268
269 for (i = 0; i < count; i++) {
270 if ((!*elements) ||
271 ((*elements)->common.type != ACPI_TYPE_INTEGER)) {
272 return (AE_AML_OPERAND_TYPE);
273 }
274 elements++;
275 }
276
277 /* Create the new buffer object to replace the Package */
278
279 new_object = acpi_ut_create_buffer_object(ACPI_MUL_4(count));
280 if (!new_object) {
281 return (AE_NO_MEMORY);
282 }
283
284 /* Copy the package elements (integers) to the buffer as DWORDs */
285
286 elements = original_object->package.elements;
287 dword_buffer = ACPI_CAST_PTR(u32, new_object->buffer.pointer);
288
289 for (i = 0; i < count; i++) {
290 *dword_buffer = (u32)(*elements)->integer.value;
291 dword_buffer++;
292 elements++;
293 }
294 break;
295
296 default:
297
298 return (AE_AML_OPERAND_TYPE);
299 }
300
301 *return_object = new_object;
302 return (AE_OK);
303}
304
305/*******************************************************************************
306 *
307 * FUNCTION: acpi_ns_convert_to_unicode
308 *
309 * PARAMETERS: scope - Namespace node for the method/object
310 * original_object - ASCII String Object to be converted
311 * return_object - Where the new converted object is returned
312 *
313 * RETURN: Status. AE_OK if conversion was successful.
314 *
315 * DESCRIPTION: Attempt to convert a String object to a Unicode string Buffer.
316 *
317 ******************************************************************************/
318
319acpi_status
320acpi_ns_convert_to_unicode(struct acpi_namespace_node * scope,
321 union acpi_operand_object *original_object,
322 union acpi_operand_object **return_object)
323{
324 union acpi_operand_object *new_object;
325 char *ascii_string;
326 u16 *unicode_buffer;
327 u32 unicode_length;
328 u32 i;
329
330 if (!original_object) {
331 return (AE_OK);
332 }
333
334 /* If a Buffer was returned, it must be at least two bytes long */
335
336 if (original_object->common.type == ACPI_TYPE_BUFFER) {
337 if (original_object->buffer.length < 2) {
338 return (AE_AML_OPERAND_VALUE);
339 }
340
341 *return_object = NULL;
342 return (AE_OK);
343 }
344
345 /*
346 * The original object is an ASCII string. Convert this string to
347 * a unicode buffer.
348 */
349 ascii_string = original_object->string.pointer;
350 unicode_length = (original_object->string.length * 2) + 2;
351
352 /* Create a new buffer object for the Unicode data */
353
354 new_object = acpi_ut_create_buffer_object(unicode_length);
355 if (!new_object) {
356 return (AE_NO_MEMORY);
357 }
358
359 unicode_buffer = ACPI_CAST_PTR(u16, new_object->buffer.pointer);
360
361 /* Convert ASCII to Unicode */
362
363 for (i = 0; i < original_object->string.length; i++) {
364 unicode_buffer[i] = (u16)ascii_string[i];
365 }
366
367 *return_object = new_object;
368 return (AE_OK);
369}
370
371/*******************************************************************************
372 *
373 * FUNCTION: acpi_ns_convert_to_resource
374 *
375 * PARAMETERS: scope - Namespace node for the method/object
376 * original_object - Object to be converted
377 * return_object - Where the new converted object is returned
378 *
379 * RETURN: Status. AE_OK if conversion was successful
380 *
381 * DESCRIPTION: Attempt to convert a Integer object to a resource_template
382 * Buffer.
383 *
384 ******************************************************************************/
385
386acpi_status
387acpi_ns_convert_to_resource(struct acpi_namespace_node * scope,
388 union acpi_operand_object *original_object,
389 union acpi_operand_object **return_object)
390{
391 union acpi_operand_object *new_object;
392 u8 *buffer;
393
394 /*
395 * We can fix the following cases for an expected resource template:
396 * 1. No return value (interpreter slack mode is disabled)
397 * 2. A "Return (Zero)" statement
398 * 3. A "Return empty buffer" statement
399 *
400 * We will return a buffer containing a single end_tag
401 * resource descriptor.
402 */
403 if (original_object) {
404 switch (original_object->common.type) {
405 case ACPI_TYPE_INTEGER:
406
407 /* We can only repair an Integer==0 */
408
409 if (original_object->integer.value) {
410 return (AE_AML_OPERAND_TYPE);
411 }
412 break;
413
414 case ACPI_TYPE_BUFFER:
415
416 if (original_object->buffer.length) {
417
418 /* Additional checks can be added in the future */
419
420 *return_object = NULL;
421 return (AE_OK);
422 }
423 break;
424
425 case ACPI_TYPE_STRING:
426 default:
427
428 return (AE_AML_OPERAND_TYPE);
429 }
430 }
431
432 /* Create the new buffer object for the resource descriptor */
433
434 new_object = acpi_ut_create_buffer_object(2);
435 if (!new_object) {
436 return (AE_NO_MEMORY);
437 }
438
439 buffer = ACPI_CAST_PTR(u8, new_object->buffer.pointer);
440
441 /* Initialize the Buffer with a single end_tag descriptor */
442
443 buffer[0] = (ACPI_RESOURCE_NAME_END_TAG | ASL_RDESC_END_TAG_SIZE);
444 buffer[1] = 0x00;
445
446 *return_object = new_object;
447 return (AE_OK);
448}
449
450/*******************************************************************************
451 *
452 * FUNCTION: acpi_ns_convert_to_reference
453 *
454 * PARAMETERS: scope - Namespace node for the method/object
455 * original_object - Object to be converted
456 * return_object - Where the new converted object is returned
457 *
458 * RETURN: Status. AE_OK if conversion was successful
459 *
460 * DESCRIPTION: Attempt to convert a Integer object to a object_reference.
461 * Buffer.
462 *
463 ******************************************************************************/
464
465acpi_status
466acpi_ns_convert_to_reference(struct acpi_namespace_node * scope,
467 union acpi_operand_object *original_object,
468 union acpi_operand_object **return_object)
469{
470 union acpi_operand_object *new_object = NULL;
471 acpi_status status;
472 struct acpi_namespace_node *node;
473 union acpi_generic_state scope_info;
474 char *name;
475
476 ACPI_FUNCTION_NAME(ns_convert_to_reference);
477
478 /* Convert path into internal presentation */
479
480 status =
481 acpi_ns_internalize_name(original_object->string.pointer, &name);
482 if (ACPI_FAILURE(status)) {
483 return_ACPI_STATUS(status);
484 }
485
486 /* Find the namespace node */
487
488 scope_info.scope.node =
489 ACPI_CAST_PTR(struct acpi_namespace_node, scope);
490 status =
491 acpi_ns_lookup(&scope_info, name, ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE,
492 ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE,
493 NULL, &node);
494 if (ACPI_FAILURE(status)) {
495
496 /* Check if we are resolving a named reference within a package */
497
498 ACPI_ERROR_NAMESPACE(original_object->string.pointer, status);
499 goto error_exit;
500 }
501
502 /* Create and init a new internal ACPI object */
503
504 new_object = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
505 if (!new_object) {
506 status = AE_NO_MEMORY;
507 goto error_exit;
508 }
509 new_object->reference.node = node;
510 new_object->reference.object = node->object;
511 new_object->reference.class = ACPI_REFCLASS_NAME;
512
513 /*
514 * Increase reference of the object if needed (the object is likely a
515 * null for device nodes).
516 */
517 acpi_ut_add_reference(node->object);
518
519error_exit:
520 ACPI_FREE(name);
521 *return_object = new_object;
522 return (AE_OK);
523}