]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: exconvrt - Object conversion routines | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
75a44ce0 | 8 | * Copyright (C) 2000 - 2008, Intel Corp. |
1da177e4 LT |
9 | * All rights reserved. |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions | |
13 | * are met: | |
14 | * 1. Redistributions of source code must retain the above copyright | |
15 | * notice, this list of conditions, and the following disclaimer, | |
16 | * without modification. | |
17 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer | |
18 | * substantially similar to the "NO WARRANTY" disclaimer below | |
19 | * ("Disclaimer") and any redistribution must be conditioned upon | |
20 | * including a substantially similar Disclaimer requirement for further | |
21 | * binary redistribution. | |
22 | * 3. Neither the names of the above-listed copyright holders nor the names | |
23 | * of any contributors may be used to endorse or promote products derived | |
24 | * from this software without specific prior written permission. | |
25 | * | |
26 | * Alternatively, this software may be distributed under the terms of the | |
27 | * GNU General Public License ("GPL") version 2 as published by the Free | |
28 | * Software Foundation. | |
29 | * | |
30 | * NO WARRANTY | |
31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR | |
34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
35 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
36 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
37 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
38 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
39 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
40 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
41 | * POSSIBILITY OF SUCH DAMAGES. | |
42 | */ | |
43 | ||
1da177e4 | 44 | #include <acpi/acpi.h> |
e2f7a777 LB |
45 | #include "accommon.h" |
46 | #include "acinterp.h" | |
47 | #include "amlcode.h" | |
1da177e4 | 48 | |
1da177e4 | 49 | #define _COMPONENT ACPI_EXECUTER |
4be44fcd | 50 | ACPI_MODULE_NAME("exconvrt") |
1da177e4 | 51 | |
44f6c012 | 52 | /* Local prototypes */ |
44f6c012 | 53 | static u32 |
4be44fcd LB |
54 | acpi_ex_convert_to_ascii(acpi_integer integer, |
55 | u16 base, u8 * string, u8 max_length); | |
1da177e4 LT |
56 | |
57 | /******************************************************************************* | |
58 | * | |
59 | * FUNCTION: acpi_ex_convert_to_integer | |
60 | * | |
2425a096 | 61 | * PARAMETERS: obj_desc - Object to be converted. Must be an |
1da177e4 LT |
62 | * Integer, Buffer, or String |
63 | * result_desc - Where the new Integer object is returned | |
64 | * Flags - Used for string conversion | |
65 | * | |
66 | * RETURN: Status | |
67 | * | |
68 | * DESCRIPTION: Convert an ACPI Object to an integer. | |
69 | * | |
70 | ******************************************************************************/ | |
71 | ||
72 | acpi_status | |
4be44fcd LB |
73 | acpi_ex_convert_to_integer(union acpi_operand_object *obj_desc, |
74 | union acpi_operand_object **result_desc, u32 flags) | |
1da177e4 | 75 | { |
4be44fcd LB |
76 | union acpi_operand_object *return_desc; |
77 | u8 *pointer; | |
78 | acpi_integer result; | |
79 | u32 i; | |
80 | u32 count; | |
81 | acpi_status status; | |
1da177e4 | 82 | |
b229cf92 | 83 | ACPI_FUNCTION_TRACE_PTR(ex_convert_to_integer, obj_desc); |
1da177e4 | 84 | |
3371c19c | 85 | switch (obj_desc->common.type) { |
1da177e4 LT |
86 | case ACPI_TYPE_INTEGER: |
87 | ||
88 | /* No conversion necessary */ | |
89 | ||
90 | *result_desc = obj_desc; | |
4be44fcd | 91 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
92 | |
93 | case ACPI_TYPE_BUFFER: | |
94 | case ACPI_TYPE_STRING: | |
95 | ||
96 | /* Note: Takes advantage of common buffer/string fields */ | |
97 | ||
98 | pointer = obj_desc->buffer.pointer; | |
4be44fcd | 99 | count = obj_desc->buffer.length; |
1da177e4 LT |
100 | break; |
101 | ||
102 | default: | |
4be44fcd | 103 | return_ACPI_STATUS(AE_TYPE); |
1da177e4 LT |
104 | } |
105 | ||
106 | /* | |
2425a096 | 107 | * Convert the buffer/string to an integer. Note that both buffers and |
1da177e4 LT |
108 | * strings are treated as raw data - we don't convert ascii to hex for |
109 | * strings. | |
110 | * | |
111 | * There are two terminating conditions for the loop: | |
112 | * 1) The size of an integer has been reached, or | |
113 | * 2) The end of the buffer or string has been reached | |
114 | */ | |
115 | result = 0; | |
116 | ||
44f6c012 RM |
117 | /* String conversion is different than Buffer conversion */ |
118 | ||
3371c19c | 119 | switch (obj_desc->common.type) { |
1da177e4 LT |
120 | case ACPI_TYPE_STRING: |
121 | ||
122 | /* | |
123 | * Convert string to an integer - for most cases, the string must be | |
2425a096 | 124 | * hexadecimal as per the ACPI specification. The only exception (as |
1da177e4 LT |
125 | * of ACPI 3.0) is that the to_integer() operator allows both decimal |
126 | * and hexadecimal strings (hex prefixed with "0x"). | |
127 | */ | |
4be44fcd LB |
128 | status = acpi_ut_strtoul64((char *)pointer, flags, &result); |
129 | if (ACPI_FAILURE(status)) { | |
130 | return_ACPI_STATUS(status); | |
1da177e4 LT |
131 | } |
132 | break; | |
133 | ||
1da177e4 LT |
134 | case ACPI_TYPE_BUFFER: |
135 | ||
136 | /* Check for zero-length buffer */ | |
137 | ||
138 | if (!count) { | |
4be44fcd | 139 | return_ACPI_STATUS(AE_AML_BUFFER_LIMIT); |
1da177e4 LT |
140 | } |
141 | ||
142 | /* Transfer no more than an integer's worth of data */ | |
143 | ||
144 | if (count > acpi_gbl_integer_byte_width) { | |
145 | count = acpi_gbl_integer_byte_width; | |
146 | } | |
147 | ||
148 | /* | |
149 | * Convert buffer to an integer - we simply grab enough raw data | |
150 | * from the buffer to fill an integer | |
151 | */ | |
152 | for (i = 0; i < count; i++) { | |
153 | /* | |
154 | * Get next byte and shift it into the Result. | |
155 | * Little endian is used, meaning that the first byte of the buffer | |
156 | * is the LSB of the integer | |
157 | */ | |
158 | result |= (((acpi_integer) pointer[i]) << (i * 8)); | |
159 | } | |
160 | break; | |
161 | ||
1da177e4 | 162 | default: |
2425a096 | 163 | |
1da177e4 LT |
164 | /* No other types can get here */ |
165 | break; | |
166 | } | |
167 | ||
44f6c012 RM |
168 | /* Create a new integer */ |
169 | ||
4be44fcd | 170 | return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER); |
1da177e4 | 171 | if (!return_desc) { |
4be44fcd | 172 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
173 | } |
174 | ||
f6dd9221 BM |
175 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Converted value: %8.8X%8.8X\n", |
176 | ACPI_FORMAT_UINT64(result))); | |
177 | ||
1da177e4 LT |
178 | /* Save the Result */ |
179 | ||
180 | return_desc->integer.value = result; | |
4be44fcd | 181 | acpi_ex_truncate_for32bit_table(return_desc); |
1da177e4 | 182 | *result_desc = return_desc; |
4be44fcd | 183 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
184 | } |
185 | ||
1da177e4 LT |
186 | /******************************************************************************* |
187 | * | |
188 | * FUNCTION: acpi_ex_convert_to_buffer | |
189 | * | |
2425a096 | 190 | * PARAMETERS: obj_desc - Object to be converted. Must be an |
1da177e4 LT |
191 | * Integer, Buffer, or String |
192 | * result_desc - Where the new buffer object is returned | |
193 | * | |
194 | * RETURN: Status | |
195 | * | |
196 | * DESCRIPTION: Convert an ACPI Object to a Buffer | |
197 | * | |
198 | ******************************************************************************/ | |
199 | ||
200 | acpi_status | |
4be44fcd LB |
201 | acpi_ex_convert_to_buffer(union acpi_operand_object *obj_desc, |
202 | union acpi_operand_object **result_desc) | |
1da177e4 | 203 | { |
4be44fcd LB |
204 | union acpi_operand_object *return_desc; |
205 | u8 *new_buf; | |
1da177e4 | 206 | |
b229cf92 | 207 | ACPI_FUNCTION_TRACE_PTR(ex_convert_to_buffer, obj_desc); |
1da177e4 | 208 | |
3371c19c | 209 | switch (obj_desc->common.type) { |
1da177e4 LT |
210 | case ACPI_TYPE_BUFFER: |
211 | ||
212 | /* No conversion necessary */ | |
213 | ||
214 | *result_desc = obj_desc; | |
4be44fcd | 215 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
216 | |
217 | case ACPI_TYPE_INTEGER: | |
218 | ||
219 | /* | |
220 | * Create a new Buffer object. | |
221 | * Need enough space for one integer | |
222 | */ | |
4be44fcd LB |
223 | return_desc = |
224 | acpi_ut_create_buffer_object(acpi_gbl_integer_byte_width); | |
1da177e4 | 225 | if (!return_desc) { |
4be44fcd | 226 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
227 | } |
228 | ||
229 | /* Copy the integer to the buffer, LSB first */ | |
230 | ||
231 | new_buf = return_desc->buffer.pointer; | |
4be44fcd LB |
232 | ACPI_MEMCPY(new_buf, |
233 | &obj_desc->integer.value, | |
234 | acpi_gbl_integer_byte_width); | |
1da177e4 LT |
235 | break; |
236 | ||
1da177e4 LT |
237 | case ACPI_TYPE_STRING: |
238 | ||
239 | /* | |
240 | * Create a new Buffer object | |
241 | * Size will be the string length | |
242 | * | |
243 | * NOTE: Add one to the string length to include the null terminator. | |
244 | * The ACPI spec is unclear on this subject, but there is existing | |
245 | * ASL/AML code that depends on the null being transferred to the new | |
246 | * buffer. | |
247 | */ | |
4be44fcd LB |
248 | return_desc = acpi_ut_create_buffer_object((acpi_size) |
249 | obj_desc->string. | |
250 | length + 1); | |
1da177e4 | 251 | if (!return_desc) { |
4be44fcd | 252 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
253 | } |
254 | ||
255 | /* Copy the string to the buffer */ | |
256 | ||
257 | new_buf = return_desc->buffer.pointer; | |
4be44fcd LB |
258 | ACPI_STRNCPY((char *)new_buf, (char *)obj_desc->string.pointer, |
259 | obj_desc->string.length); | |
1da177e4 LT |
260 | break; |
261 | ||
1da177e4 | 262 | default: |
4be44fcd | 263 | return_ACPI_STATUS(AE_TYPE); |
1da177e4 LT |
264 | } |
265 | ||
266 | /* Mark buffer initialized */ | |
267 | ||
268 | return_desc->common.flags |= AOPOBJ_DATA_VALID; | |
269 | *result_desc = return_desc; | |
4be44fcd | 270 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
271 | } |
272 | ||
1da177e4 LT |
273 | /******************************************************************************* |
274 | * | |
275 | * FUNCTION: acpi_ex_convert_to_ascii | |
276 | * | |
277 | * PARAMETERS: Integer - Value to be converted | |
278 | * Base - ACPI_STRING_DECIMAL or ACPI_STRING_HEX | |
279 | * String - Where the string is returned | |
280 | * data_width - Size of data item to be converted, in bytes | |
281 | * | |
282 | * RETURN: Actual string length | |
283 | * | |
284 | * DESCRIPTION: Convert an ACPI Integer to a hex or decimal string | |
285 | * | |
286 | ******************************************************************************/ | |
287 | ||
44f6c012 | 288 | static u32 |
4be44fcd LB |
289 | acpi_ex_convert_to_ascii(acpi_integer integer, |
290 | u16 base, u8 * string, u8 data_width) | |
1da177e4 | 291 | { |
4be44fcd | 292 | acpi_integer digit; |
67a119f9 BM |
293 | u32 i; |
294 | u32 j; | |
295 | u32 k = 0; | |
296 | u32 hex_length; | |
297 | u32 decimal_length; | |
4be44fcd LB |
298 | u32 remainder; |
299 | u8 supress_zeros; | |
1da177e4 | 300 | |
4be44fcd | 301 | ACPI_FUNCTION_ENTRY(); |
1da177e4 LT |
302 | |
303 | switch (base) { | |
304 | case 10: | |
305 | ||
306 | /* Setup max length for the decimal number */ | |
307 | ||
308 | switch (data_width) { | |
309 | case 1: | |
310 | decimal_length = ACPI_MAX8_DECIMAL_DIGITS; | |
311 | break; | |
312 | ||
313 | case 4: | |
314 | decimal_length = ACPI_MAX32_DECIMAL_DIGITS; | |
315 | break; | |
316 | ||
317 | case 8: | |
318 | default: | |
319 | decimal_length = ACPI_MAX64_DECIMAL_DIGITS; | |
320 | break; | |
321 | } | |
322 | ||
4be44fcd | 323 | supress_zeros = TRUE; /* No leading zeros */ |
1da177e4 LT |
324 | remainder = 0; |
325 | ||
326 | for (i = decimal_length; i > 0; i--) { | |
52fc0b02 | 327 | |
1da177e4 LT |
328 | /* Divide by nth factor of 10 */ |
329 | ||
330 | digit = integer; | |
331 | for (j = 0; j < i; j++) { | |
4be44fcd LB |
332 | (void)acpi_ut_short_divide(digit, 10, &digit, |
333 | &remainder); | |
1da177e4 LT |
334 | } |
335 | ||
336 | /* Handle leading zeros */ | |
337 | ||
338 | if (remainder != 0) { | |
339 | supress_zeros = FALSE; | |
340 | } | |
341 | ||
342 | if (!supress_zeros) { | |
343 | string[k] = (u8) (ACPI_ASCII_ZERO + remainder); | |
344 | k++; | |
345 | } | |
346 | } | |
347 | break; | |
348 | ||
349 | case 16: | |
350 | ||
44f6c012 | 351 | /* hex_length: 2 ascii hex chars per data byte */ |
1da177e4 | 352 | |
67a119f9 | 353 | hex_length = ACPI_MUL_2(data_width); |
4be44fcd | 354 | for (i = 0, j = (hex_length - 1); i < hex_length; i++, j--) { |
52fc0b02 | 355 | |
1da177e4 LT |
356 | /* Get one hex digit, most significant digits first */ |
357 | ||
4be44fcd LB |
358 | string[k] = |
359 | (u8) acpi_ut_hex_to_ascii_char(integer, | |
360 | ACPI_MUL_4(j)); | |
1da177e4 LT |
361 | k++; |
362 | } | |
363 | break; | |
364 | ||
365 | default: | |
366 | return (0); | |
367 | } | |
368 | ||
369 | /* | |
2425a096 | 370 | * Since leading zeros are suppressed, we must check for the case where |
1da177e4 LT |
371 | * the integer equals 0 |
372 | * | |
373 | * Finally, null terminate the string and return the length | |
374 | */ | |
375 | if (!k) { | |
4be44fcd | 376 | string[0] = ACPI_ASCII_ZERO; |
1da177e4 LT |
377 | k = 1; |
378 | } | |
379 | ||
4be44fcd | 380 | string[k] = 0; |
1da177e4 LT |
381 | return ((u32) k); |
382 | } | |
383 | ||
1da177e4 LT |
384 | /******************************************************************************* |
385 | * | |
386 | * FUNCTION: acpi_ex_convert_to_string | |
387 | * | |
2425a096 | 388 | * PARAMETERS: obj_desc - Object to be converted. Must be an |
1da177e4 LT |
389 | * Integer, Buffer, or String |
390 | * result_desc - Where the string object is returned | |
391 | * Type - String flags (base and conversion type) | |
392 | * | |
393 | * RETURN: Status | |
394 | * | |
395 | * DESCRIPTION: Convert an ACPI Object to a string | |
396 | * | |
397 | ******************************************************************************/ | |
398 | ||
399 | acpi_status | |
4be44fcd LB |
400 | acpi_ex_convert_to_string(union acpi_operand_object * obj_desc, |
401 | union acpi_operand_object ** result_desc, u32 type) | |
1da177e4 | 402 | { |
4be44fcd LB |
403 | union acpi_operand_object *return_desc; |
404 | u8 *new_buf; | |
405 | u32 i; | |
406 | u32 string_length = 0; | |
407 | u16 base = 16; | |
408 | u8 separator = ','; | |
1da177e4 | 409 | |
b229cf92 | 410 | ACPI_FUNCTION_TRACE_PTR(ex_convert_to_string, obj_desc); |
1da177e4 | 411 | |
3371c19c | 412 | switch (obj_desc->common.type) { |
1da177e4 LT |
413 | case ACPI_TYPE_STRING: |
414 | ||
415 | /* No conversion necessary */ | |
416 | ||
417 | *result_desc = obj_desc; | |
4be44fcd | 418 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
419 | |
420 | case ACPI_TYPE_INTEGER: | |
421 | ||
422 | switch (type) { | |
423 | case ACPI_EXPLICIT_CONVERT_DECIMAL: | |
424 | ||
425 | /* Make room for maximum decimal number */ | |
426 | ||
427 | string_length = ACPI_MAX_DECIMAL_DIGITS; | |
428 | base = 10; | |
429 | break; | |
430 | ||
431 | default: | |
432 | ||
433 | /* Two hex string characters for each integer byte */ | |
434 | ||
4be44fcd | 435 | string_length = ACPI_MUL_2(acpi_gbl_integer_byte_width); |
1da177e4 LT |
436 | break; |
437 | } | |
438 | ||
439 | /* | |
440 | * Create a new String | |
441 | * Need enough space for one ASCII integer (plus null terminator) | |
442 | */ | |
4be44fcd LB |
443 | return_desc = |
444 | acpi_ut_create_string_object((acpi_size) string_length); | |
1da177e4 | 445 | if (!return_desc) { |
4be44fcd | 446 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
447 | } |
448 | ||
449 | new_buf = return_desc->buffer.pointer; | |
450 | ||
451 | /* Convert integer to string */ | |
452 | ||
4be44fcd LB |
453 | string_length = |
454 | acpi_ex_convert_to_ascii(obj_desc->integer.value, base, | |
455 | new_buf, | |
456 | acpi_gbl_integer_byte_width); | |
1da177e4 LT |
457 | |
458 | /* Null terminate at the correct place */ | |
459 | ||
460 | return_desc->string.length = string_length; | |
4be44fcd | 461 | new_buf[string_length] = 0; |
1da177e4 LT |
462 | break; |
463 | ||
1da177e4 LT |
464 | case ACPI_TYPE_BUFFER: |
465 | ||
466 | /* Setup string length, base, and separator */ | |
467 | ||
468 | switch (type) { | |
4be44fcd | 469 | case ACPI_EXPLICIT_CONVERT_DECIMAL: /* Used by to_decimal_string */ |
1da177e4 LT |
470 | /* |
471 | * From ACPI: "If Data is a buffer, it is converted to a string of | |
472 | * decimal values separated by commas." | |
473 | */ | |
474 | base = 10; | |
475 | ||
476 | /* | |
2425a096 | 477 | * Calculate the final string length. Individual string values |
1da177e4 LT |
478 | * are variable length (include separator for each) |
479 | */ | |
480 | for (i = 0; i < obj_desc->buffer.length; i++) { | |
481 | if (obj_desc->buffer.pointer[i] >= 100) { | |
482 | string_length += 4; | |
4be44fcd | 483 | } else if (obj_desc->buffer.pointer[i] >= 10) { |
1da177e4 | 484 | string_length += 3; |
4be44fcd | 485 | } else { |
1da177e4 LT |
486 | string_length += 2; |
487 | } | |
488 | } | |
489 | break; | |
490 | ||
491 | case ACPI_IMPLICIT_CONVERT_HEX: | |
492 | /* | |
493 | * From the ACPI spec: | |
494 | *"The entire contents of the buffer are converted to a string of | |
495 | * two-character hexadecimal numbers, each separated by a space." | |
496 | */ | |
497 | separator = ' '; | |
498 | string_length = (obj_desc->buffer.length * 3); | |
499 | break; | |
500 | ||
4be44fcd | 501 | case ACPI_EXPLICIT_CONVERT_HEX: /* Used by to_hex_string */ |
1da177e4 LT |
502 | /* |
503 | * From ACPI: "If Data is a buffer, it is converted to a string of | |
504 | * hexadecimal values separated by commas." | |
505 | */ | |
506 | string_length = (obj_desc->buffer.length * 3); | |
507 | break; | |
508 | ||
509 | default: | |
4be44fcd | 510 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
511 | } |
512 | ||
513 | /* | |
c51a4de8 | 514 | * Create a new string object and string buffer |
1da177e4 | 515 | * (-1 because of extra separator included in string_length from above) |
4ca846e9 | 516 | * Allow creation of zero-length strings from zero-length buffers. |
1da177e4 | 517 | */ |
4ca846e9 BM |
518 | if (string_length) { |
519 | string_length--; | |
520 | } | |
521 | ||
fd350943 | 522 | return_desc = acpi_ut_create_string_object((acpi_size) |
4ca846e9 | 523 | string_length); |
1da177e4 | 524 | if (!return_desc) { |
4be44fcd | 525 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
526 | } |
527 | ||
528 | new_buf = return_desc->buffer.pointer; | |
529 | ||
530 | /* | |
531 | * Convert buffer bytes to hex or decimal values | |
532 | * (separated by commas or spaces) | |
533 | */ | |
534 | for (i = 0; i < obj_desc->buffer.length; i++) { | |
4be44fcd LB |
535 | new_buf += acpi_ex_convert_to_ascii((acpi_integer) |
536 | obj_desc->buffer. | |
537 | pointer[i], base, | |
538 | new_buf, 1); | |
539 | *new_buf++ = separator; /* each separated by a comma or space */ | |
1da177e4 LT |
540 | } |
541 | ||
44f6c012 RM |
542 | /* |
543 | * Null terminate the string | |
544 | * (overwrites final comma/space from above) | |
545 | */ | |
4ca846e9 BM |
546 | if (obj_desc->buffer.length) { |
547 | new_buf--; | |
548 | } | |
1da177e4 LT |
549 | *new_buf = 0; |
550 | break; | |
551 | ||
552 | default: | |
4be44fcd | 553 | return_ACPI_STATUS(AE_TYPE); |
1da177e4 LT |
554 | } |
555 | ||
556 | *result_desc = return_desc; | |
4be44fcd | 557 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
558 | } |
559 | ||
1da177e4 LT |
560 | /******************************************************************************* |
561 | * | |
562 | * FUNCTION: acpi_ex_convert_to_target_type | |
563 | * | |
564 | * PARAMETERS: destination_type - Current type of the destination | |
565 | * source_desc - Source object to be converted. | |
566 | * result_desc - Where the converted object is returned | |
567 | * walk_state - Current method state | |
568 | * | |
569 | * RETURN: Status | |
570 | * | |
571 | * DESCRIPTION: Implements "implicit conversion" rules for storing an object. | |
572 | * | |
573 | ******************************************************************************/ | |
574 | ||
575 | acpi_status | |
4be44fcd LB |
576 | acpi_ex_convert_to_target_type(acpi_object_type destination_type, |
577 | union acpi_operand_object *source_desc, | |
578 | union acpi_operand_object **result_desc, | |
579 | struct acpi_walk_state *walk_state) | |
1da177e4 | 580 | { |
4be44fcd | 581 | acpi_status status = AE_OK; |
1da177e4 | 582 | |
b229cf92 | 583 | ACPI_FUNCTION_TRACE(ex_convert_to_target_type); |
1da177e4 LT |
584 | |
585 | /* Default behavior */ | |
586 | ||
587 | *result_desc = source_desc; | |
588 | ||
589 | /* | |
590 | * If required by the target, | |
591 | * perform implicit conversion on the source before we store it. | |
592 | */ | |
4be44fcd | 593 | switch (GET_CURRENT_ARG_TYPE(walk_state->op_info->runtime_args)) { |
1da177e4 LT |
594 | case ARGI_SIMPLE_TARGET: |
595 | case ARGI_FIXED_TARGET: | |
4be44fcd | 596 | case ARGI_INTEGER_REF: /* Handles Increment, Decrement cases */ |
1da177e4 LT |
597 | |
598 | switch (destination_type) { | |
599 | case ACPI_TYPE_LOCAL_REGION_FIELD: | |
600 | /* | |
601 | * Named field can always handle conversions | |
602 | */ | |
603 | break; | |
604 | ||
605 | default: | |
606 | /* No conversion allowed for these types */ | |
607 | ||
3371c19c | 608 | if (destination_type != source_desc->common.type) { |
4be44fcd LB |
609 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
610 | "Explicit operator, will store (%s) over existing type (%s)\n", | |
611 | acpi_ut_get_object_type_name | |
612 | (source_desc), | |
613 | acpi_ut_get_type_name | |
614 | (destination_type))); | |
1da177e4 LT |
615 | status = AE_TYPE; |
616 | } | |
617 | } | |
618 | break; | |
619 | ||
1da177e4 LT |
620 | case ARGI_TARGETREF: |
621 | ||
622 | switch (destination_type) { | |
623 | case ACPI_TYPE_INTEGER: | |
624 | case ACPI_TYPE_BUFFER_FIELD: | |
625 | case ACPI_TYPE_LOCAL_BANK_FIELD: | |
626 | case ACPI_TYPE_LOCAL_INDEX_FIELD: | |
627 | /* | |
2425a096 | 628 | * These types require an Integer operand. We can convert |
1da177e4 LT |
629 | * a Buffer or a String to an Integer if necessary. |
630 | */ | |
4be44fcd LB |
631 | status = |
632 | acpi_ex_convert_to_integer(source_desc, result_desc, | |
633 | 16); | |
1da177e4 LT |
634 | break; |
635 | ||
1da177e4 | 636 | case ACPI_TYPE_STRING: |
1da177e4 | 637 | /* |
2425a096 | 638 | * The operand must be a String. We can convert an |
1da177e4 LT |
639 | * Integer or Buffer if necessary |
640 | */ | |
4be44fcd LB |
641 | status = |
642 | acpi_ex_convert_to_string(source_desc, result_desc, | |
643 | ACPI_IMPLICIT_CONVERT_HEX); | |
1da177e4 LT |
644 | break; |
645 | ||
1da177e4 | 646 | case ACPI_TYPE_BUFFER: |
1da177e4 | 647 | /* |
2425a096 | 648 | * The operand must be a Buffer. We can convert an |
1da177e4 LT |
649 | * Integer or String if necessary |
650 | */ | |
4be44fcd LB |
651 | status = |
652 | acpi_ex_convert_to_buffer(source_desc, result_desc); | |
1da177e4 LT |
653 | break; |
654 | ||
1da177e4 | 655 | default: |
b8e4d893 BM |
656 | ACPI_ERROR((AE_INFO, |
657 | "Bad destination type during conversion: %X", | |
658 | destination_type)); | |
1da177e4 LT |
659 | status = AE_AML_INTERNAL; |
660 | break; | |
661 | } | |
662 | break; | |
663 | ||
1da177e4 LT |
664 | case ARGI_REFERENCE: |
665 | /* | |
666 | * create_xxxx_field cases - we are storing the field object into the name | |
667 | */ | |
668 | break; | |
669 | ||
1da177e4 | 670 | default: |
b8e4d893 | 671 | ACPI_ERROR((AE_INFO, |
b229cf92 | 672 | "Unknown Target type ID 0x%X AmlOpcode %X DestType %s", |
b8e4d893 BM |
673 | GET_CURRENT_ARG_TYPE(walk_state->op_info-> |
674 | runtime_args), | |
675 | walk_state->opcode, | |
676 | acpi_ut_get_type_name(destination_type))); | |
4a90c7e8 | 677 | status = AE_AML_INTERNAL; |
1da177e4 LT |
678 | } |
679 | ||
680 | /* | |
681 | * Source-to-Target conversion semantics: | |
682 | * | |
683 | * If conversion to the target type cannot be performed, then simply | |
684 | * overwrite the target with the new object and type. | |
685 | */ | |
686 | if (status == AE_TYPE) { | |
687 | status = AE_OK; | |
688 | } | |
689 | ||
4be44fcd | 690 | return_ACPI_STATUS(status); |
1da177e4 | 691 | } |