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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: exconvrt - Object conversion routines | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
4a90c7e8 | 8 | * Copyright (C) 2000 - 2006, R. Byron Moore |
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 LT |
44 | #include <acpi/acpi.h> |
45 | #include <acpi/acinterp.h> | |
46 | #include <acpi/amlcode.h> | |
47 | ||
1da177e4 | 48 | #define _COMPONENT ACPI_EXECUTER |
4be44fcd | 49 | ACPI_MODULE_NAME("exconvrt") |
1da177e4 | 50 | |
44f6c012 | 51 | /* Local prototypes */ |
44f6c012 | 52 | static u32 |
4be44fcd LB |
53 | acpi_ex_convert_to_ascii(acpi_integer integer, |
54 | u16 base, u8 * string, u8 max_length); | |
1da177e4 LT |
55 | |
56 | /******************************************************************************* | |
57 | * | |
58 | * FUNCTION: acpi_ex_convert_to_integer | |
59 | * | |
60 | * PARAMETERS: obj_desc - Object to be converted. Must be an | |
61 | * Integer, Buffer, or String | |
62 | * result_desc - Where the new Integer object is returned | |
63 | * Flags - Used for string conversion | |
64 | * | |
65 | * RETURN: Status | |
66 | * | |
67 | * DESCRIPTION: Convert an ACPI Object to an integer. | |
68 | * | |
69 | ******************************************************************************/ | |
70 | ||
71 | acpi_status | |
4be44fcd LB |
72 | acpi_ex_convert_to_integer(union acpi_operand_object *obj_desc, |
73 | union acpi_operand_object **result_desc, u32 flags) | |
1da177e4 | 74 | { |
4be44fcd LB |
75 | union acpi_operand_object *return_desc; |
76 | u8 *pointer; | |
77 | acpi_integer result; | |
78 | u32 i; | |
79 | u32 count; | |
80 | acpi_status status; | |
1da177e4 | 81 | |
b229cf92 | 82 | ACPI_FUNCTION_TRACE_PTR(ex_convert_to_integer, obj_desc); |
1da177e4 | 83 | |
4be44fcd | 84 | switch (ACPI_GET_OBJECT_TYPE(obj_desc)) { |
1da177e4 LT |
85 | case ACPI_TYPE_INTEGER: |
86 | ||
87 | /* No conversion necessary */ | |
88 | ||
89 | *result_desc = obj_desc; | |
4be44fcd | 90 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
91 | |
92 | case ACPI_TYPE_BUFFER: | |
93 | case ACPI_TYPE_STRING: | |
94 | ||
95 | /* Note: Takes advantage of common buffer/string fields */ | |
96 | ||
97 | pointer = obj_desc->buffer.pointer; | |
4be44fcd | 98 | count = obj_desc->buffer.length; |
1da177e4 LT |
99 | break; |
100 | ||
101 | default: | |
4be44fcd | 102 | return_ACPI_STATUS(AE_TYPE); |
1da177e4 LT |
103 | } |
104 | ||
105 | /* | |
106 | * Convert the buffer/string to an integer. Note that both buffers and | |
107 | * strings are treated as raw data - we don't convert ascii to hex for | |
108 | * strings. | |
109 | * | |
110 | * There are two terminating conditions for the loop: | |
111 | * 1) The size of an integer has been reached, or | |
112 | * 2) The end of the buffer or string has been reached | |
113 | */ | |
114 | result = 0; | |
115 | ||
44f6c012 RM |
116 | /* String conversion is different than Buffer conversion */ |
117 | ||
4be44fcd | 118 | switch (ACPI_GET_OBJECT_TYPE(obj_desc)) { |
1da177e4 LT |
119 | case ACPI_TYPE_STRING: |
120 | ||
121 | /* | |
122 | * Convert string to an integer - for most cases, the string must be | |
123 | * hexadecimal as per the ACPI specification. The only exception (as | |
124 | * of ACPI 3.0) is that the to_integer() operator allows both decimal | |
125 | * and hexadecimal strings (hex prefixed with "0x"). | |
126 | */ | |
4be44fcd LB |
127 | status = acpi_ut_strtoul64((char *)pointer, flags, &result); |
128 | if (ACPI_FAILURE(status)) { | |
129 | return_ACPI_STATUS(status); | |
1da177e4 LT |
130 | } |
131 | break; | |
132 | ||
1da177e4 LT |
133 | case ACPI_TYPE_BUFFER: |
134 | ||
135 | /* Check for zero-length buffer */ | |
136 | ||
137 | if (!count) { | |
4be44fcd | 138 | return_ACPI_STATUS(AE_AML_BUFFER_LIMIT); |
1da177e4 LT |
139 | } |
140 | ||
141 | /* Transfer no more than an integer's worth of data */ | |
142 | ||
143 | if (count > acpi_gbl_integer_byte_width) { | |
144 | count = acpi_gbl_integer_byte_width; | |
145 | } | |
146 | ||
147 | /* | |
148 | * Convert buffer to an integer - we simply grab enough raw data | |
149 | * from the buffer to fill an integer | |
150 | */ | |
151 | for (i = 0; i < count; i++) { | |
152 | /* | |
153 | * Get next byte and shift it into the Result. | |
154 | * Little endian is used, meaning that the first byte of the buffer | |
155 | * is the LSB of the integer | |
156 | */ | |
157 | result |= (((acpi_integer) pointer[i]) << (i * 8)); | |
158 | } | |
159 | break; | |
160 | ||
1da177e4 LT |
161 | default: |
162 | /* No other types can get here */ | |
163 | break; | |
164 | } | |
165 | ||
44f6c012 RM |
166 | /* Create a new integer */ |
167 | ||
4be44fcd | 168 | return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER); |
1da177e4 | 169 | if (!return_desc) { |
4be44fcd | 170 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
171 | } |
172 | ||
173 | /* Save the Result */ | |
174 | ||
175 | return_desc->integer.value = result; | |
4be44fcd | 176 | acpi_ex_truncate_for32bit_table(return_desc); |
1da177e4 | 177 | *result_desc = return_desc; |
4be44fcd | 178 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
179 | } |
180 | ||
1da177e4 LT |
181 | /******************************************************************************* |
182 | * | |
183 | * FUNCTION: acpi_ex_convert_to_buffer | |
184 | * | |
185 | * PARAMETERS: obj_desc - Object to be converted. Must be an | |
186 | * Integer, Buffer, or String | |
187 | * result_desc - Where the new buffer object is returned | |
188 | * | |
189 | * RETURN: Status | |
190 | * | |
191 | * DESCRIPTION: Convert an ACPI Object to a Buffer | |
192 | * | |
193 | ******************************************************************************/ | |
194 | ||
195 | acpi_status | |
4be44fcd LB |
196 | acpi_ex_convert_to_buffer(union acpi_operand_object *obj_desc, |
197 | union acpi_operand_object **result_desc) | |
1da177e4 | 198 | { |
4be44fcd LB |
199 | union acpi_operand_object *return_desc; |
200 | u8 *new_buf; | |
1da177e4 | 201 | |
b229cf92 | 202 | ACPI_FUNCTION_TRACE_PTR(ex_convert_to_buffer, obj_desc); |
1da177e4 | 203 | |
4be44fcd | 204 | switch (ACPI_GET_OBJECT_TYPE(obj_desc)) { |
1da177e4 LT |
205 | case ACPI_TYPE_BUFFER: |
206 | ||
207 | /* No conversion necessary */ | |
208 | ||
209 | *result_desc = obj_desc; | |
4be44fcd | 210 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
211 | |
212 | case ACPI_TYPE_INTEGER: | |
213 | ||
214 | /* | |
215 | * Create a new Buffer object. | |
216 | * Need enough space for one integer | |
217 | */ | |
4be44fcd LB |
218 | return_desc = |
219 | acpi_ut_create_buffer_object(acpi_gbl_integer_byte_width); | |
1da177e4 | 220 | if (!return_desc) { |
4be44fcd | 221 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
222 | } |
223 | ||
224 | /* Copy the integer to the buffer, LSB first */ | |
225 | ||
226 | new_buf = return_desc->buffer.pointer; | |
4be44fcd LB |
227 | ACPI_MEMCPY(new_buf, |
228 | &obj_desc->integer.value, | |
229 | acpi_gbl_integer_byte_width); | |
1da177e4 LT |
230 | break; |
231 | ||
1da177e4 LT |
232 | case ACPI_TYPE_STRING: |
233 | ||
234 | /* | |
235 | * Create a new Buffer object | |
236 | * Size will be the string length | |
237 | * | |
238 | * NOTE: Add one to the string length to include the null terminator. | |
239 | * The ACPI spec is unclear on this subject, but there is existing | |
240 | * ASL/AML code that depends on the null being transferred to the new | |
241 | * buffer. | |
242 | */ | |
4be44fcd LB |
243 | return_desc = acpi_ut_create_buffer_object((acpi_size) |
244 | obj_desc->string. | |
245 | length + 1); | |
1da177e4 | 246 | if (!return_desc) { |
4be44fcd | 247 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
248 | } |
249 | ||
250 | /* Copy the string to the buffer */ | |
251 | ||
252 | new_buf = return_desc->buffer.pointer; | |
4be44fcd LB |
253 | ACPI_STRNCPY((char *)new_buf, (char *)obj_desc->string.pointer, |
254 | obj_desc->string.length); | |
1da177e4 LT |
255 | break; |
256 | ||
1da177e4 | 257 | default: |
4be44fcd | 258 | return_ACPI_STATUS(AE_TYPE); |
1da177e4 LT |
259 | } |
260 | ||
261 | /* Mark buffer initialized */ | |
262 | ||
263 | return_desc->common.flags |= AOPOBJ_DATA_VALID; | |
264 | *result_desc = return_desc; | |
4be44fcd | 265 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
266 | } |
267 | ||
1da177e4 LT |
268 | /******************************************************************************* |
269 | * | |
270 | * FUNCTION: acpi_ex_convert_to_ascii | |
271 | * | |
272 | * PARAMETERS: Integer - Value to be converted | |
273 | * Base - ACPI_STRING_DECIMAL or ACPI_STRING_HEX | |
274 | * String - Where the string is returned | |
275 | * data_width - Size of data item to be converted, in bytes | |
276 | * | |
277 | * RETURN: Actual string length | |
278 | * | |
279 | * DESCRIPTION: Convert an ACPI Integer to a hex or decimal string | |
280 | * | |
281 | ******************************************************************************/ | |
282 | ||
44f6c012 | 283 | static u32 |
4be44fcd LB |
284 | acpi_ex_convert_to_ascii(acpi_integer integer, |
285 | u16 base, u8 * string, u8 data_width) | |
1da177e4 | 286 | { |
4be44fcd LB |
287 | acpi_integer digit; |
288 | acpi_native_uint i; | |
289 | acpi_native_uint j; | |
290 | acpi_native_uint k = 0; | |
291 | acpi_native_uint hex_length; | |
292 | acpi_native_uint decimal_length; | |
293 | u32 remainder; | |
294 | u8 supress_zeros; | |
1da177e4 | 295 | |
4be44fcd | 296 | ACPI_FUNCTION_ENTRY(); |
1da177e4 LT |
297 | |
298 | switch (base) { | |
299 | case 10: | |
300 | ||
301 | /* Setup max length for the decimal number */ | |
302 | ||
303 | switch (data_width) { | |
304 | case 1: | |
305 | decimal_length = ACPI_MAX8_DECIMAL_DIGITS; | |
306 | break; | |
307 | ||
308 | case 4: | |
309 | decimal_length = ACPI_MAX32_DECIMAL_DIGITS; | |
310 | break; | |
311 | ||
312 | case 8: | |
313 | default: | |
314 | decimal_length = ACPI_MAX64_DECIMAL_DIGITS; | |
315 | break; | |
316 | } | |
317 | ||
4be44fcd | 318 | supress_zeros = TRUE; /* No leading zeros */ |
1da177e4 LT |
319 | remainder = 0; |
320 | ||
321 | for (i = decimal_length; i > 0; i--) { | |
52fc0b02 | 322 | |
1da177e4 LT |
323 | /* Divide by nth factor of 10 */ |
324 | ||
325 | digit = integer; | |
326 | for (j = 0; j < i; j++) { | |
4be44fcd LB |
327 | (void)acpi_ut_short_divide(digit, 10, &digit, |
328 | &remainder); | |
1da177e4 LT |
329 | } |
330 | ||
331 | /* Handle leading zeros */ | |
332 | ||
333 | if (remainder != 0) { | |
334 | supress_zeros = FALSE; | |
335 | } | |
336 | ||
337 | if (!supress_zeros) { | |
338 | string[k] = (u8) (ACPI_ASCII_ZERO + remainder); | |
339 | k++; | |
340 | } | |
341 | } | |
342 | break; | |
343 | ||
344 | case 16: | |
345 | ||
44f6c012 | 346 | /* hex_length: 2 ascii hex chars per data byte */ |
1da177e4 | 347 | |
4be44fcd LB |
348 | hex_length = (acpi_native_uint) ACPI_MUL_2(data_width); |
349 | for (i = 0, j = (hex_length - 1); i < hex_length; i++, j--) { | |
52fc0b02 | 350 | |
1da177e4 LT |
351 | /* Get one hex digit, most significant digits first */ |
352 | ||
4be44fcd LB |
353 | string[k] = |
354 | (u8) acpi_ut_hex_to_ascii_char(integer, | |
355 | ACPI_MUL_4(j)); | |
1da177e4 LT |
356 | k++; |
357 | } | |
358 | break; | |
359 | ||
360 | default: | |
361 | return (0); | |
362 | } | |
363 | ||
364 | /* | |
365 | * Since leading zeros are supressed, we must check for the case where | |
366 | * the integer equals 0 | |
367 | * | |
368 | * Finally, null terminate the string and return the length | |
369 | */ | |
370 | if (!k) { | |
4be44fcd | 371 | string[0] = ACPI_ASCII_ZERO; |
1da177e4 LT |
372 | k = 1; |
373 | } | |
374 | ||
4be44fcd | 375 | string[k] = 0; |
1da177e4 LT |
376 | return ((u32) k); |
377 | } | |
378 | ||
1da177e4 LT |
379 | /******************************************************************************* |
380 | * | |
381 | * FUNCTION: acpi_ex_convert_to_string | |
382 | * | |
383 | * PARAMETERS: obj_desc - Object to be converted. Must be an | |
384 | * Integer, Buffer, or String | |
385 | * result_desc - Where the string object is returned | |
386 | * Type - String flags (base and conversion type) | |
387 | * | |
388 | * RETURN: Status | |
389 | * | |
390 | * DESCRIPTION: Convert an ACPI Object to a string | |
391 | * | |
392 | ******************************************************************************/ | |
393 | ||
394 | acpi_status | |
4be44fcd LB |
395 | acpi_ex_convert_to_string(union acpi_operand_object * obj_desc, |
396 | union acpi_operand_object ** result_desc, u32 type) | |
1da177e4 | 397 | { |
4be44fcd LB |
398 | union acpi_operand_object *return_desc; |
399 | u8 *new_buf; | |
400 | u32 i; | |
401 | u32 string_length = 0; | |
402 | u16 base = 16; | |
403 | u8 separator = ','; | |
1da177e4 | 404 | |
b229cf92 | 405 | ACPI_FUNCTION_TRACE_PTR(ex_convert_to_string, obj_desc); |
1da177e4 | 406 | |
4be44fcd | 407 | switch (ACPI_GET_OBJECT_TYPE(obj_desc)) { |
1da177e4 LT |
408 | case ACPI_TYPE_STRING: |
409 | ||
410 | /* No conversion necessary */ | |
411 | ||
412 | *result_desc = obj_desc; | |
4be44fcd | 413 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
414 | |
415 | case ACPI_TYPE_INTEGER: | |
416 | ||
417 | switch (type) { | |
418 | case ACPI_EXPLICIT_CONVERT_DECIMAL: | |
419 | ||
420 | /* Make room for maximum decimal number */ | |
421 | ||
422 | string_length = ACPI_MAX_DECIMAL_DIGITS; | |
423 | base = 10; | |
424 | break; | |
425 | ||
426 | default: | |
427 | ||
428 | /* Two hex string characters for each integer byte */ | |
429 | ||
4be44fcd | 430 | string_length = ACPI_MUL_2(acpi_gbl_integer_byte_width); |
1da177e4 LT |
431 | break; |
432 | } | |
433 | ||
434 | /* | |
435 | * Create a new String | |
436 | * Need enough space for one ASCII integer (plus null terminator) | |
437 | */ | |
4be44fcd LB |
438 | return_desc = |
439 | acpi_ut_create_string_object((acpi_size) string_length); | |
1da177e4 | 440 | if (!return_desc) { |
4be44fcd | 441 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
442 | } |
443 | ||
444 | new_buf = return_desc->buffer.pointer; | |
445 | ||
446 | /* Convert integer to string */ | |
447 | ||
4be44fcd LB |
448 | string_length = |
449 | acpi_ex_convert_to_ascii(obj_desc->integer.value, base, | |
450 | new_buf, | |
451 | acpi_gbl_integer_byte_width); | |
1da177e4 LT |
452 | |
453 | /* Null terminate at the correct place */ | |
454 | ||
455 | return_desc->string.length = string_length; | |
4be44fcd | 456 | new_buf[string_length] = 0; |
1da177e4 LT |
457 | break; |
458 | ||
1da177e4 LT |
459 | case ACPI_TYPE_BUFFER: |
460 | ||
461 | /* Setup string length, base, and separator */ | |
462 | ||
463 | switch (type) { | |
4be44fcd | 464 | case ACPI_EXPLICIT_CONVERT_DECIMAL: /* Used by to_decimal_string */ |
1da177e4 LT |
465 | /* |
466 | * From ACPI: "If Data is a buffer, it is converted to a string of | |
467 | * decimal values separated by commas." | |
468 | */ | |
469 | base = 10; | |
470 | ||
471 | /* | |
472 | * Calculate the final string length. Individual string values | |
473 | * are variable length (include separator for each) | |
474 | */ | |
475 | for (i = 0; i < obj_desc->buffer.length; i++) { | |
476 | if (obj_desc->buffer.pointer[i] >= 100) { | |
477 | string_length += 4; | |
4be44fcd | 478 | } else if (obj_desc->buffer.pointer[i] >= 10) { |
1da177e4 | 479 | string_length += 3; |
4be44fcd | 480 | } else { |
1da177e4 LT |
481 | string_length += 2; |
482 | } | |
483 | } | |
484 | break; | |
485 | ||
486 | case ACPI_IMPLICIT_CONVERT_HEX: | |
487 | /* | |
488 | * From the ACPI spec: | |
489 | *"The entire contents of the buffer are converted to a string of | |
490 | * two-character hexadecimal numbers, each separated by a space." | |
491 | */ | |
492 | separator = ' '; | |
493 | string_length = (obj_desc->buffer.length * 3); | |
494 | break; | |
495 | ||
4be44fcd | 496 | case ACPI_EXPLICIT_CONVERT_HEX: /* Used by to_hex_string */ |
1da177e4 LT |
497 | /* |
498 | * From ACPI: "If Data is a buffer, it is converted to a string of | |
499 | * hexadecimal values separated by commas." | |
500 | */ | |
501 | string_length = (obj_desc->buffer.length * 3); | |
502 | break; | |
503 | ||
504 | default: | |
4be44fcd | 505 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
506 | } |
507 | ||
508 | /* | |
c51a4de8 | 509 | * Create a new string object and string buffer |
1da177e4 LT |
510 | * (-1 because of extra separator included in string_length from above) |
511 | */ | |
4be44fcd | 512 | return_desc = |
c51a4de8 BM |
513 | acpi_ut_create_string_object((acpi_size) |
514 | (string_length - 1)); | |
1da177e4 | 515 | if (!return_desc) { |
4be44fcd | 516 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
517 | } |
518 | ||
519 | new_buf = return_desc->buffer.pointer; | |
520 | ||
521 | /* | |
522 | * Convert buffer bytes to hex or decimal values | |
523 | * (separated by commas or spaces) | |
524 | */ | |
525 | for (i = 0; i < obj_desc->buffer.length; i++) { | |
4be44fcd LB |
526 | new_buf += acpi_ex_convert_to_ascii((acpi_integer) |
527 | obj_desc->buffer. | |
528 | pointer[i], base, | |
529 | new_buf, 1); | |
530 | *new_buf++ = separator; /* each separated by a comma or space */ | |
1da177e4 LT |
531 | } |
532 | ||
44f6c012 RM |
533 | /* |
534 | * Null terminate the string | |
535 | * (overwrites final comma/space from above) | |
536 | */ | |
1da177e4 LT |
537 | new_buf--; |
538 | *new_buf = 0; | |
539 | break; | |
540 | ||
541 | default: | |
4be44fcd | 542 | return_ACPI_STATUS(AE_TYPE); |
1da177e4 LT |
543 | } |
544 | ||
545 | *result_desc = return_desc; | |
4be44fcd | 546 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
547 | } |
548 | ||
1da177e4 LT |
549 | /******************************************************************************* |
550 | * | |
551 | * FUNCTION: acpi_ex_convert_to_target_type | |
552 | * | |
553 | * PARAMETERS: destination_type - Current type of the destination | |
554 | * source_desc - Source object to be converted. | |
555 | * result_desc - Where the converted object is returned | |
556 | * walk_state - Current method state | |
557 | * | |
558 | * RETURN: Status | |
559 | * | |
560 | * DESCRIPTION: Implements "implicit conversion" rules for storing an object. | |
561 | * | |
562 | ******************************************************************************/ | |
563 | ||
564 | acpi_status | |
4be44fcd LB |
565 | acpi_ex_convert_to_target_type(acpi_object_type destination_type, |
566 | union acpi_operand_object *source_desc, | |
567 | union acpi_operand_object **result_desc, | |
568 | struct acpi_walk_state *walk_state) | |
1da177e4 | 569 | { |
4be44fcd | 570 | acpi_status status = AE_OK; |
1da177e4 | 571 | |
b229cf92 | 572 | ACPI_FUNCTION_TRACE(ex_convert_to_target_type); |
1da177e4 LT |
573 | |
574 | /* Default behavior */ | |
575 | ||
576 | *result_desc = source_desc; | |
577 | ||
578 | /* | |
579 | * If required by the target, | |
580 | * perform implicit conversion on the source before we store it. | |
581 | */ | |
4be44fcd | 582 | switch (GET_CURRENT_ARG_TYPE(walk_state->op_info->runtime_args)) { |
1da177e4 LT |
583 | case ARGI_SIMPLE_TARGET: |
584 | case ARGI_FIXED_TARGET: | |
4be44fcd | 585 | case ARGI_INTEGER_REF: /* Handles Increment, Decrement cases */ |
1da177e4 LT |
586 | |
587 | switch (destination_type) { | |
588 | case ACPI_TYPE_LOCAL_REGION_FIELD: | |
589 | /* | |
590 | * Named field can always handle conversions | |
591 | */ | |
592 | break; | |
593 | ||
594 | default: | |
595 | /* No conversion allowed for these types */ | |
596 | ||
4be44fcd LB |
597 | if (destination_type != |
598 | ACPI_GET_OBJECT_TYPE(source_desc)) { | |
599 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
600 | "Explicit operator, will store (%s) over existing type (%s)\n", | |
601 | acpi_ut_get_object_type_name | |
602 | (source_desc), | |
603 | acpi_ut_get_type_name | |
604 | (destination_type))); | |
1da177e4 LT |
605 | status = AE_TYPE; |
606 | } | |
607 | } | |
608 | break; | |
609 | ||
1da177e4 LT |
610 | case ARGI_TARGETREF: |
611 | ||
612 | switch (destination_type) { | |
613 | case ACPI_TYPE_INTEGER: | |
614 | case ACPI_TYPE_BUFFER_FIELD: | |
615 | case ACPI_TYPE_LOCAL_BANK_FIELD: | |
616 | case ACPI_TYPE_LOCAL_INDEX_FIELD: | |
617 | /* | |
618 | * These types require an Integer operand. We can convert | |
619 | * a Buffer or a String to an Integer if necessary. | |
620 | */ | |
4be44fcd LB |
621 | status = |
622 | acpi_ex_convert_to_integer(source_desc, result_desc, | |
623 | 16); | |
1da177e4 LT |
624 | break; |
625 | ||
1da177e4 | 626 | case ACPI_TYPE_STRING: |
1da177e4 LT |
627 | /* |
628 | * The operand must be a String. We can convert an | |
629 | * Integer or Buffer if necessary | |
630 | */ | |
4be44fcd LB |
631 | status = |
632 | acpi_ex_convert_to_string(source_desc, result_desc, | |
633 | ACPI_IMPLICIT_CONVERT_HEX); | |
1da177e4 LT |
634 | break; |
635 | ||
1da177e4 | 636 | case ACPI_TYPE_BUFFER: |
1da177e4 LT |
637 | /* |
638 | * The operand must be a Buffer. We can convert an | |
639 | * Integer or String if necessary | |
640 | */ | |
4be44fcd LB |
641 | status = |
642 | acpi_ex_convert_to_buffer(source_desc, result_desc); | |
1da177e4 LT |
643 | break; |
644 | ||
1da177e4 | 645 | default: |
b8e4d893 BM |
646 | ACPI_ERROR((AE_INFO, |
647 | "Bad destination type during conversion: %X", | |
648 | destination_type)); | |
1da177e4 LT |
649 | status = AE_AML_INTERNAL; |
650 | break; | |
651 | } | |
652 | break; | |
653 | ||
1da177e4 LT |
654 | case ARGI_REFERENCE: |
655 | /* | |
656 | * create_xxxx_field cases - we are storing the field object into the name | |
657 | */ | |
658 | break; | |
659 | ||
1da177e4 | 660 | default: |
b8e4d893 | 661 | ACPI_ERROR((AE_INFO, |
b229cf92 | 662 | "Unknown Target type ID 0x%X AmlOpcode %X DestType %s", |
b8e4d893 BM |
663 | GET_CURRENT_ARG_TYPE(walk_state->op_info-> |
664 | runtime_args), | |
665 | walk_state->opcode, | |
666 | acpi_ut_get_type_name(destination_type))); | |
4a90c7e8 | 667 | status = AE_AML_INTERNAL; |
1da177e4 LT |
668 | } |
669 | ||
670 | /* | |
671 | * Source-to-Target conversion semantics: | |
672 | * | |
673 | * If conversion to the target type cannot be performed, then simply | |
674 | * overwrite the target with the new object and type. | |
675 | */ | |
676 | if (status == AE_TYPE) { | |
677 | status = AE_OK; | |
678 | } | |
679 | ||
4be44fcd | 680 | return_ACPI_STATUS(status); |
1da177e4 | 681 | } |