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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 - 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
53 ACPI_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  ******************************************************************************/
67 acpi_status
68 acpi_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:
106                 return (AE_AML_OPERAND_TYPE);
107         }
108
109         new_object = acpi_ut_create_integer_object(value);
110         if (!new_object) {
111                 return (AE_NO_MEMORY);
112         }
113
114         *return_object = new_object;
115         return (AE_OK);
116 }
117
118 /*******************************************************************************
119  *
120  * FUNCTION:    acpi_ns_convert_to_string
121  *
122  * PARAMETERS:  original_object     - Object to be converted
123  *              return_object       - Where the new converted object is returned
124  *
125  * RETURN:      Status. AE_OK if conversion was successful.
126  *
127  * DESCRIPTION: Attempt to convert a Integer/Buffer object to a String.
128  *
129  ******************************************************************************/
130
131 acpi_status
132 acpi_ns_convert_to_string(union acpi_operand_object *original_object,
133                           union acpi_operand_object **return_object)
134 {
135         union acpi_operand_object *new_object;
136         acpi_size length;
137         acpi_status status;
138
139         switch (original_object->common.type) {
140         case ACPI_TYPE_INTEGER:
141                 /*
142                  * Integer-to-String conversion. Commonly, convert
143                  * an integer of value 0 to a NULL string. The last element of
144                  * _BIF and _BIX packages occasionally need this fix.
145                  */
146                 if (original_object->integer.value == 0) {
147
148                         /* Allocate a new NULL string object */
149
150                         new_object = acpi_ut_create_string_object(0);
151                         if (!new_object) {
152                                 return (AE_NO_MEMORY);
153                         }
154                 } else {
155                         status =
156                             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                 ACPI_MEMCPY(new_object->string.pointer,
190                             original_object->buffer.pointer, length);
191                 break;
192
193         default:
194                 return (AE_AML_OPERAND_TYPE);
195         }
196
197         *return_object = new_object;
198         return (AE_OK);
199 }
200
201 /*******************************************************************************
202  *
203  * FUNCTION:    acpi_ns_convert_to_buffer
204  *
205  * PARAMETERS:  original_object     - Object to be converted
206  *              return_object       - Where the new converted object is returned
207  *
208  * RETURN:      Status. AE_OK if conversion was successful.
209  *
210  * DESCRIPTION: Attempt to convert a Integer/String/Package object to a Buffer.
211  *
212  ******************************************************************************/
213
214 acpi_status
215 acpi_ns_convert_to_buffer(union acpi_operand_object *original_object,
216                           union acpi_operand_object **return_object)
217 {
218         union acpi_operand_object *new_object;
219         acpi_status status;
220         union acpi_operand_object **elements;
221         u32 *dword_buffer;
222         u32 count;
223         u32 i;
224
225         switch (original_object->common.type) {
226         case ACPI_TYPE_INTEGER:
227                 /*
228                  * Integer-to-Buffer conversion.
229                  * Convert the Integer to a packed-byte buffer. _MAT and other
230                  * objects need this sometimes, if a read has been performed on a
231                  * Field object that is less than or equal to the global integer
232                  * size (32 or 64 bits).
233                  */
234                 status =
235                     acpi_ex_convert_to_buffer(original_object, &new_object);
236                 if (ACPI_FAILURE(status)) {
237                         return (status);
238                 }
239                 break;
240
241         case ACPI_TYPE_STRING:
242
243                 /* String-to-Buffer conversion. Simple data copy */
244
245                 new_object =
246                     acpi_ut_create_buffer_object(original_object->string.
247                                                  length);
248                 if (!new_object) {
249                         return (AE_NO_MEMORY);
250                 }
251
252                 ACPI_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                 return (AE_AML_OPERAND_TYPE);
298         }
299
300         *return_object = new_object;
301         return (AE_OK);
302 }
303
304 /*******************************************************************************
305  *
306  * FUNCTION:    acpi_ns_convert_to_unicode
307  *
308  * PARAMETERS:  original_object     - ASCII String Object to be converted
309  *              return_object       - Where the new converted object is returned
310  *
311  * RETURN:      Status. AE_OK if conversion was successful.
312  *
313  * DESCRIPTION: Attempt to convert a String object to a Unicode string Buffer.
314  *
315  ******************************************************************************/
316
317 acpi_status
318 acpi_ns_convert_to_unicode(union acpi_operand_object *original_object,
319                            union acpi_operand_object **return_object)
320 {
321         union acpi_operand_object *new_object;
322         char *ascii_string;
323         u16 *unicode_buffer;
324         u32 unicode_length;
325         u32 i;
326
327         if (!original_object) {
328                 return (AE_OK);
329         }
330
331         /* If a Buffer was returned, it must be at least two bytes long */
332
333         if (original_object->common.type == ACPI_TYPE_BUFFER) {
334                 if (original_object->buffer.length < 2) {
335                         return (AE_AML_OPERAND_VALUE);
336                 }
337
338                 *return_object = NULL;
339                 return (AE_OK);
340         }
341
342         /*
343          * The original object is an ASCII string. Convert this string to
344          * a unicode buffer.
345          */
346         ascii_string = original_object->string.pointer;
347         unicode_length = (original_object->string.length * 2) + 2;
348
349         /* Create a new buffer object for the Unicode data */
350
351         new_object = acpi_ut_create_buffer_object(unicode_length);
352         if (!new_object) {
353                 return (AE_NO_MEMORY);
354         }
355
356         unicode_buffer = ACPI_CAST_PTR(u16, new_object->buffer.pointer);
357
358         /* Convert ASCII to Unicode */
359
360         for (i = 0; i < original_object->string.length; i++) {
361                 unicode_buffer[i] = (u16)ascii_string[i];
362         }
363
364         *return_object = new_object;
365         return (AE_OK);
366 }
367
368 /*******************************************************************************
369  *
370  * FUNCTION:    acpi_ns_convert_to_resource
371  *
372  * PARAMETERS:  original_object     - Object to be converted
373  *              return_object       - Where the new converted object is returned
374  *
375  * RETURN:      Status. AE_OK if conversion was successful
376  *
377  * DESCRIPTION: Attempt to convert a Integer object to a resource_template
378  *              Buffer.
379  *
380  ******************************************************************************/
381
382 acpi_status
383 acpi_ns_convert_to_resource(union acpi_operand_object *original_object,
384                             union acpi_operand_object **return_object)
385 {
386         union acpi_operand_object *new_object;
387         u8 *buffer;
388
389         /*
390          * We can fix the following cases for an expected resource template:
391          * 1. No return value (interpreter slack mode is disabled)
392          * 2. A "Return (Zero)" statement
393          * 3. A "Return empty buffer" statement
394          *
395          * We will return a buffer containing a single end_tag
396          * resource descriptor.
397          */
398         if (original_object) {
399                 switch (original_object->common.type) {
400                 case ACPI_TYPE_INTEGER:
401
402                         /* We can only repair an Integer==0 */
403
404                         if (original_object->integer.value) {
405                                 return (AE_AML_OPERAND_TYPE);
406                         }
407                         break;
408
409                 case ACPI_TYPE_BUFFER:
410
411                         if (original_object->buffer.length) {
412
413                                 /* Additional checks can be added in the future */
414
415                                 *return_object = NULL;
416                                 return (AE_OK);
417                         }
418                         break;
419
420                 case ACPI_TYPE_STRING:
421                 default:
422
423                         return (AE_AML_OPERAND_TYPE);
424                 }
425         }
426
427         /* Create the new buffer object for the resource descriptor */
428
429         new_object = acpi_ut_create_buffer_object(2);
430         if (!new_object) {
431                 return (AE_NO_MEMORY);
432         }
433
434         buffer = ACPI_CAST_PTR(u8, new_object->buffer.pointer);
435
436         /* Initialize the Buffer with a single end_tag descriptor */
437
438         buffer[0] = (ACPI_RESOURCE_NAME_END_TAG | ASL_RDESC_END_TAG_SIZE);
439         buffer[1] = 0x00;
440
441         *return_object = new_object;
442         return (AE_OK);
443 }