blob: acd2964c26906f995b159bd382a42ce000cfa2c3 [file] [log] [blame]
Bob Moore76a62252013-03-08 09:23:16 +00001/******************************************************************************
2 *
3 * Module Name: nsconvert - Object conversions for objects returned by
4 * predefined methods
5 *
6 *****************************************************************************/
7
8/*
9 * Copyright (C) 2000 - 2013, 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 |=
100 ((u64)original_object->buffer.
101 pointer[i] << (i * 8));
102 }
103 break;
104
105 default:
Chao Guan1d1ea1b2013-06-08 00:58:14 +0000106
Bob Moore76a62252013-03-08 09:23:16 +0000107 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 =
157 acpi_ex_convert_to_string(original_object,
158 &new_object,
159 ACPI_IMPLICIT_CONVERT_HEX);
160 if (ACPI_FAILURE(status)) {
161 return (status);
162 }
163 }
164 break;
165
166 case ACPI_TYPE_BUFFER:
167 /*
168 * Buffer-to-String conversion. Use a to_string
169 * conversion, no transform performed on the buffer data. The best
170 * example of this is the _BIF method, where the string data from
171 * the battery is often (incorrectly) returned as buffer object(s).
172 */
173 length = 0;
174 while ((length < original_object->buffer.length) &&
175 (original_object->buffer.pointer[length])) {
176 length++;
177 }
178
179 /* Allocate a new string object */
180
181 new_object = acpi_ut_create_string_object(length);
182 if (!new_object) {
183 return (AE_NO_MEMORY);
184 }
185
186 /*
187 * Copy the raw buffer data with no transform. String is already NULL
188 * terminated at Length+1.
189 */
190 ACPI_MEMCPY(new_object->string.pointer,
191 original_object->buffer.pointer, length);
192 break;
193
194 default:
Chao Guan1d1ea1b2013-06-08 00:58:14 +0000195
Bob Moore76a62252013-03-08 09:23:16 +0000196 return (AE_AML_OPERAND_TYPE);
197 }
198
199 *return_object = new_object;
200 return (AE_OK);
201}
202
203/*******************************************************************************
204 *
205 * FUNCTION: acpi_ns_convert_to_buffer
206 *
207 * PARAMETERS: original_object - Object to be converted
208 * return_object - Where the new converted object is returned
209 *
210 * RETURN: Status. AE_OK if conversion was successful.
211 *
212 * DESCRIPTION: Attempt to convert a Integer/String/Package object to a Buffer.
213 *
214 ******************************************************************************/
215
216acpi_status
217acpi_ns_convert_to_buffer(union acpi_operand_object *original_object,
218 union acpi_operand_object **return_object)
219{
220 union acpi_operand_object *new_object;
221 acpi_status status;
222 union acpi_operand_object **elements;
223 u32 *dword_buffer;
224 u32 count;
225 u32 i;
226
227 switch (original_object->common.type) {
228 case ACPI_TYPE_INTEGER:
229 /*
230 * Integer-to-Buffer conversion.
231 * Convert the Integer to a packed-byte buffer. _MAT and other
232 * objects need this sometimes, if a read has been performed on a
233 * Field object that is less than or equal to the global integer
234 * size (32 or 64 bits).
235 */
236 status =
237 acpi_ex_convert_to_buffer(original_object, &new_object);
238 if (ACPI_FAILURE(status)) {
239 return (status);
240 }
241 break;
242
243 case ACPI_TYPE_STRING:
244
245 /* String-to-Buffer conversion. Simple data copy */
246
247 new_object =
248 acpi_ut_create_buffer_object(original_object->string.
249 length);
250 if (!new_object) {
251 return (AE_NO_MEMORY);
252 }
253
254 ACPI_MEMCPY(new_object->buffer.pointer,
255 original_object->string.pointer,
256 original_object->string.length);
257 break;
258
259 case ACPI_TYPE_PACKAGE:
260 /*
261 * This case is often seen for predefined names that must return a
262 * Buffer object with multiple DWORD integers within. For example,
263 * _FDE and _GTM. The Package can be converted to a Buffer.
264 */
265
266 /* All elements of the Package must be integers */
267
268 elements = original_object->package.elements;
269 count = original_object->package.count;
270
271 for (i = 0; i < count; i++) {
272 if ((!*elements) ||
273 ((*elements)->common.type != ACPI_TYPE_INTEGER)) {
274 return (AE_AML_OPERAND_TYPE);
275 }
276 elements++;
277 }
278
279 /* Create the new buffer object to replace the Package */
280
281 new_object = acpi_ut_create_buffer_object(ACPI_MUL_4(count));
282 if (!new_object) {
283 return (AE_NO_MEMORY);
284 }
285
286 /* Copy the package elements (integers) to the buffer as DWORDs */
287
288 elements = original_object->package.elements;
289 dword_buffer = ACPI_CAST_PTR(u32, new_object->buffer.pointer);
290
291 for (i = 0; i < count; i++) {
292 *dword_buffer = (u32)(*elements)->integer.value;
293 dword_buffer++;
294 elements++;
295 }
296 break;
297
298 default:
Chao Guan1d1ea1b2013-06-08 00:58:14 +0000299
Bob Moore76a62252013-03-08 09:23:16 +0000300 return (AE_AML_OPERAND_TYPE);
301 }
302
303 *return_object = new_object;
304 return (AE_OK);
305}
Lv Zheng96b44cc2013-03-08 09:23:24 +0000306
307/*******************************************************************************
308 *
309 * FUNCTION: acpi_ns_convert_to_unicode
310 *
311 * PARAMETERS: original_object - ASCII String Object to be converted
312 * return_object - Where the new converted object is returned
313 *
314 * RETURN: Status. AE_OK if conversion was successful.
315 *
316 * DESCRIPTION: Attempt to convert a String object to a Unicode string Buffer.
317 *
318 ******************************************************************************/
319
320acpi_status
321acpi_ns_convert_to_unicode(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}
Lv Zheng88fd0ac2013-03-08 09:23:32 +0000370
371/*******************************************************************************
372 *
373 * FUNCTION: acpi_ns_convert_to_resource
374 *
375 * PARAMETERS: original_object - Object to be converted
376 * return_object - Where the new converted object is returned
377 *
378 * RETURN: Status. AE_OK if conversion was successful
379 *
380 * DESCRIPTION: Attempt to convert a Integer object to a resource_template
381 * Buffer.
382 *
383 ******************************************************************************/
384
385acpi_status
386acpi_ns_convert_to_resource(union acpi_operand_object *original_object,
387 union acpi_operand_object **return_object)
388{
389 union acpi_operand_object *new_object;
390 u8 *buffer;
391
392 /*
393 * We can fix the following cases for an expected resource template:
394 * 1. No return value (interpreter slack mode is disabled)
395 * 2. A "Return (Zero)" statement
396 * 3. A "Return empty buffer" statement
397 *
398 * We will return a buffer containing a single end_tag
399 * resource descriptor.
400 */
401 if (original_object) {
402 switch (original_object->common.type) {
403 case ACPI_TYPE_INTEGER:
404
405 /* We can only repair an Integer==0 */
406
407 if (original_object->integer.value) {
408 return (AE_AML_OPERAND_TYPE);
409 }
410 break;
411
412 case ACPI_TYPE_BUFFER:
413
414 if (original_object->buffer.length) {
415
416 /* Additional checks can be added in the future */
417
418 *return_object = NULL;
419 return (AE_OK);
420 }
421 break;
422
423 case ACPI_TYPE_STRING:
424 default:
425
426 return (AE_AML_OPERAND_TYPE);
427 }
428 }
429
430 /* Create the new buffer object for the resource descriptor */
431
432 new_object = acpi_ut_create_buffer_object(2);
433 if (!new_object) {
434 return (AE_NO_MEMORY);
435 }
436
437 buffer = ACPI_CAST_PTR(u8, new_object->buffer.pointer);
438
439 /* Initialize the Buffer with a single end_tag descriptor */
440
441 buffer[0] = (ACPI_RESOURCE_NAME_END_TAG | ASL_RDESC_END_TAG_SIZE);
442 buffer[1] = 0x00;
443
444 *return_object = new_object;
445 return (AE_OK);
446}