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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: exfldio - Aml Field I/O | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
82a80941 | 8 | * Copyright (C) 2000 - 2015, 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" | |
48 | #include "acevents.h" | |
49 | #include "acdispat.h" | |
1da177e4 | 50 | |
1da177e4 | 51 | #define _COMPONENT ACPI_EXECUTER |
4be44fcd | 52 | ACPI_MODULE_NAME("exfldio") |
1da177e4 | 53 | |
44f6c012 | 54 | /* Local prototypes */ |
44f6c012 | 55 | static acpi_status |
4be44fcd | 56 | acpi_ex_field_datum_io(union acpi_operand_object *obj_desc, |
1f86e8c1 | 57 | u32 field_datum_byte_offset, u64 *value, u32 read_write); |
44f6c012 RM |
58 | |
59 | static u8 | |
5df7e6cb | 60 | acpi_ex_register_overflow(union acpi_operand_object *obj_desc, u64 value); |
44f6c012 RM |
61 | |
62 | static acpi_status | |
4be44fcd LB |
63 | acpi_ex_setup_region(union acpi_operand_object *obj_desc, |
64 | u32 field_datum_byte_offset); | |
1da177e4 LT |
65 | |
66 | /******************************************************************************* | |
67 | * | |
68 | * FUNCTION: acpi_ex_setup_region | |
69 | * | |
44f6c012 | 70 | * PARAMETERS: obj_desc - Field to be read or written |
1da177e4 LT |
71 | * field_datum_byte_offset - Byte offset of this datum within the |
72 | * parent field | |
73 | * | |
74 | * RETURN: Status | |
75 | * | |
76 | * DESCRIPTION: Common processing for acpi_ex_extract_from_field and | |
77 | * acpi_ex_insert_into_field. Initialize the Region if necessary and | |
78 | * validate the request. | |
79 | * | |
80 | ******************************************************************************/ | |
81 | ||
44f6c012 | 82 | static acpi_status |
4be44fcd LB |
83 | acpi_ex_setup_region(union acpi_operand_object *obj_desc, |
84 | u32 field_datum_byte_offset) | |
1da177e4 | 85 | { |
4be44fcd LB |
86 | acpi_status status = AE_OK; |
87 | union acpi_operand_object *rgn_desc; | |
ec463666 | 88 | u8 space_id; |
1da177e4 | 89 | |
b229cf92 | 90 | ACPI_FUNCTION_TRACE_U32(ex_setup_region, field_datum_byte_offset); |
1da177e4 LT |
91 | |
92 | rgn_desc = obj_desc->common_field.region_obj; | |
93 | ||
94 | /* We must have a valid region */ | |
95 | ||
3371c19c | 96 | if (rgn_desc->common.type != ACPI_TYPE_REGION) { |
f6a22b0b | 97 | ACPI_ERROR((AE_INFO, "Needed Region, found type 0x%X (%s)", |
3371c19c | 98 | rgn_desc->common.type, |
b8e4d893 | 99 | acpi_ut_get_object_type_name(rgn_desc))); |
1da177e4 | 100 | |
4be44fcd | 101 | return_ACPI_STATUS(AE_AML_OPERAND_TYPE); |
1da177e4 LT |
102 | } |
103 | ||
ec463666 BM |
104 | space_id = rgn_desc->region.space_id; |
105 | ||
106 | /* Validate the Space ID */ | |
107 | ||
108 | if (!acpi_is_valid_space_id(space_id)) { | |
109 | ACPI_ERROR((AE_INFO, | |
110 | "Invalid/unknown Address Space ID: 0x%2.2X", | |
111 | space_id)); | |
112 | return_ACPI_STATUS(AE_AML_INVALID_SPACE_ID); | |
113 | } | |
114 | ||
1da177e4 LT |
115 | /* |
116 | * If the Region Address and Length have not been previously evaluated, | |
117 | * evaluate them now and save the results. | |
118 | */ | |
119 | if (!(rgn_desc->common.flags & AOPOBJ_DATA_VALID)) { | |
4be44fcd LB |
120 | status = acpi_ds_get_region_arguments(rgn_desc); |
121 | if (ACPI_FAILURE(status)) { | |
122 | return_ACPI_STATUS(status); | |
1da177e4 LT |
123 | } |
124 | } | |
125 | ||
b229cf92 | 126 | /* |
2da120b6 | 127 | * Exit now for SMBus, GSBus or IPMI address space, it has a non-linear |
09387b43 | 128 | * address space and the request cannot be directly validated |
b229cf92 | 129 | */ |
ec463666 | 130 | if (space_id == ACPI_ADR_SPACE_SMBUS || |
2da120b6 | 131 | space_id == ACPI_ADR_SPACE_GSBUS || |
ec463666 | 132 | space_id == ACPI_ADR_SPACE_IPMI) { |
52fc0b02 | 133 | |
6557a49a | 134 | /* SMBus or IPMI has a non-linear address space */ |
1da177e4 | 135 | |
4be44fcd | 136 | return_ACPI_STATUS(AE_OK); |
1da177e4 | 137 | } |
1da177e4 LT |
138 | #ifdef ACPI_UNDER_DEVELOPMENT |
139 | /* | |
140 | * If the Field access is any_acc, we can now compute the optimal | |
141 | * access (because we know know the length of the parent region) | |
142 | */ | |
143 | if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) { | |
4be44fcd LB |
144 | if (ACPI_FAILURE(status)) { |
145 | return_ACPI_STATUS(status); | |
1da177e4 LT |
146 | } |
147 | } | |
148 | #endif | |
149 | ||
150 | /* | |
73a3090a | 151 | * Validate the request. The entire request from the byte offset for a |
1da177e4 LT |
152 | * length of one field datum (access width) must fit within the region. |
153 | * (Region length is specified in bytes) | |
154 | */ | |
4119532c | 155 | if (rgn_desc->region.length < |
09387b43 | 156 | (obj_desc->common_field.base_byte_offset + field_datum_byte_offset + |
4119532c | 157 | obj_desc->common_field.access_byte_width)) { |
1da177e4 LT |
158 | if (acpi_gbl_enable_interpreter_slack) { |
159 | /* | |
160 | * Slack mode only: We will go ahead and allow access to this | |
161 | * field if it is within the region length rounded up to the next | |
67a119f9 | 162 | * access width boundary. acpi_size cast for 64-bit compile. |
1da177e4 | 163 | */ |
4be44fcd LB |
164 | if (ACPI_ROUND_UP(rgn_desc->region.length, |
165 | obj_desc->common_field. | |
166 | access_byte_width) >= | |
67a119f9 BM |
167 | ((acpi_size) obj_desc->common_field. |
168 | base_byte_offset + | |
169 | obj_desc->common_field.access_byte_width + | |
170 | field_datum_byte_offset)) { | |
4be44fcd | 171 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
172 | } |
173 | } | |
174 | ||
4be44fcd LB |
175 | if (rgn_desc->region.length < |
176 | obj_desc->common_field.access_byte_width) { | |
1da177e4 LT |
177 | /* |
178 | * This is the case where the access_type (acc_word, etc.) is wider | |
73a3090a | 179 | * than the region itself. For example, a region of length one |
1da177e4 LT |
180 | * byte, and a field with Dword access specified. |
181 | */ | |
b8e4d893 | 182 | ACPI_ERROR((AE_INFO, |
f6a22b0b | 183 | "Field [%4.4s] access width (%u bytes) too large for region [%4.4s] (length %u)", |
b8e4d893 BM |
184 | acpi_ut_get_node_name(obj_desc-> |
185 | common_field.node), | |
186 | obj_desc->common_field.access_byte_width, | |
187 | acpi_ut_get_node_name(rgn_desc->region. | |
188 | node), | |
189 | rgn_desc->region.length)); | |
1da177e4 LT |
190 | } |
191 | ||
192 | /* | |
193 | * Offset rounded up to next multiple of field width | |
194 | * exceeds region length, indicate an error | |
195 | */ | |
b8e4d893 | 196 | ACPI_ERROR((AE_INFO, |
f6a22b0b | 197 | "Field [%4.4s] Base+Offset+Width %u+%u+%u is beyond end of region [%4.4s] (length %u)", |
b8e4d893 BM |
198 | acpi_ut_get_node_name(obj_desc->common_field.node), |
199 | obj_desc->common_field.base_byte_offset, | |
200 | field_datum_byte_offset, | |
201 | obj_desc->common_field.access_byte_width, | |
202 | acpi_ut_get_node_name(rgn_desc->region.node), | |
203 | rgn_desc->region.length)); | |
4be44fcd LB |
204 | |
205 | return_ACPI_STATUS(AE_AML_REGION_LIMIT); | |
1da177e4 LT |
206 | } |
207 | ||
4be44fcd | 208 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
209 | } |
210 | ||
1da177e4 LT |
211 | /******************************************************************************* |
212 | * | |
213 | * FUNCTION: acpi_ex_access_region | |
214 | * | |
44f6c012 | 215 | * PARAMETERS: obj_desc - Field to be read |
1da177e4 LT |
216 | * field_datum_byte_offset - Byte offset of this datum within the |
217 | * parent field | |
ba494bee | 218 | * value - Where to store value (must at least |
5df7e6cb | 219 | * 64 bits) |
ba494bee | 220 | * function - Read or Write flag plus other region- |
1da177e4 LT |
221 | * dependent flags |
222 | * | |
223 | * RETURN: Status | |
224 | * | |
225 | * DESCRIPTION: Read or Write a single field datum to an Operation Region. | |
226 | * | |
227 | ******************************************************************************/ | |
228 | ||
229 | acpi_status | |
4be44fcd | 230 | acpi_ex_access_region(union acpi_operand_object *obj_desc, |
5df7e6cb | 231 | u32 field_datum_byte_offset, u64 *value, u32 function) |
1da177e4 | 232 | { |
4be44fcd LB |
233 | acpi_status status; |
234 | union acpi_operand_object *rgn_desc; | |
f5407af3 | 235 | u32 region_offset; |
1da177e4 | 236 | |
b229cf92 | 237 | ACPI_FUNCTION_TRACE(ex_access_region); |
1da177e4 LT |
238 | |
239 | /* | |
240 | * Ensure that the region operands are fully evaluated and verify | |
241 | * the validity of the request | |
242 | */ | |
4be44fcd LB |
243 | status = acpi_ex_setup_region(obj_desc, field_datum_byte_offset); |
244 | if (ACPI_FAILURE(status)) { | |
245 | return_ACPI_STATUS(status); | |
1da177e4 LT |
246 | } |
247 | ||
248 | /* | |
249 | * The physical address of this field datum is: | |
250 | * | |
251 | * 1) The base of the region, plus | |
252 | * 2) The base offset of the field, plus | |
253 | * 3) The current offset into the field | |
254 | */ | |
255 | rgn_desc = obj_desc->common_field.region_obj; | |
f5407af3 | 256 | region_offset = |
4be44fcd | 257 | obj_desc->common_field.base_byte_offset + field_datum_byte_offset; |
1da177e4 LT |
258 | |
259 | if ((function & ACPI_IO_MASK) == ACPI_READ) { | |
4be44fcd LB |
260 | ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, "[READ]")); |
261 | } else { | |
262 | ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, "[WRITE]")); | |
1da177e4 LT |
263 | } |
264 | ||
4be44fcd | 265 | ACPI_DEBUG_PRINT_RAW((ACPI_DB_BFIELD, |
f3d2e786 | 266 | " Region [%s:%X], Width %X, ByteBase %X, Offset %X at %p\n", |
4be44fcd LB |
267 | acpi_ut_get_region_name(rgn_desc->region. |
268 | space_id), | |
269 | rgn_desc->region.space_id, | |
270 | obj_desc->common_field.access_byte_width, | |
271 | obj_desc->common_field.base_byte_offset, | |
b7f9f042 | 272 | field_datum_byte_offset, ACPI_CAST_PTR(void, |
f5407af3 BM |
273 | (rgn_desc-> |
274 | region. | |
275 | address + | |
276 | region_offset)))); | |
1da177e4 LT |
277 | |
278 | /* Invoke the appropriate address_space/op_region handler */ | |
279 | ||
9ce81784 BM |
280 | status = acpi_ev_address_space_dispatch(rgn_desc, obj_desc, |
281 | function, region_offset, | |
282 | ACPI_MUL_8(obj_desc-> | |
283 | common_field. | |
284 | access_byte_width), | |
285 | value); | |
1da177e4 | 286 | |
4be44fcd | 287 | if (ACPI_FAILURE(status)) { |
1da177e4 | 288 | if (status == AE_NOT_IMPLEMENTED) { |
b8e4d893 | 289 | ACPI_ERROR((AE_INFO, |
1b74dfb2 | 290 | "Region %s (ID=%u) not implemented", |
b8e4d893 BM |
291 | acpi_ut_get_region_name(rgn_desc->region. |
292 | space_id), | |
293 | rgn_desc->region.space_id)); | |
4be44fcd | 294 | } else if (status == AE_NOT_EXIST) { |
b8e4d893 | 295 | ACPI_ERROR((AE_INFO, |
1b74dfb2 | 296 | "Region %s (ID=%u) has no handler", |
b8e4d893 BM |
297 | acpi_ut_get_region_name(rgn_desc->region. |
298 | space_id), | |
299 | rgn_desc->region.space_id)); | |
1da177e4 LT |
300 | } |
301 | } | |
302 | ||
4be44fcd | 303 | return_ACPI_STATUS(status); |
1da177e4 LT |
304 | } |
305 | ||
1da177e4 LT |
306 | /******************************************************************************* |
307 | * | |
308 | * FUNCTION: acpi_ex_register_overflow | |
309 | * | |
44f6c012 | 310 | * PARAMETERS: obj_desc - Register(Field) to be written |
ba494bee | 311 | * value - Value to be stored |
1da177e4 LT |
312 | * |
313 | * RETURN: TRUE if value overflows the field, FALSE otherwise | |
314 | * | |
315 | * DESCRIPTION: Check if a value is out of range of the field being written. | |
316 | * Used to check if the values written to Index and Bank registers | |
73a3090a | 317 | * are out of range. Normally, the value is simply truncated |
1da177e4 LT |
318 | * to fit the field, but this case is most likely a serious |
319 | * coding error in the ASL. | |
320 | * | |
321 | ******************************************************************************/ | |
322 | ||
44f6c012 | 323 | static u8 |
5df7e6cb | 324 | acpi_ex_register_overflow(union acpi_operand_object *obj_desc, u64 value) |
1da177e4 LT |
325 | { |
326 | ||
327 | if (obj_desc->common_field.bit_length >= ACPI_INTEGER_BIT_SIZE) { | |
328 | /* | |
329 | * The field is large enough to hold the maximum integer, so we can | |
330 | * never overflow it. | |
331 | */ | |
332 | return (FALSE); | |
333 | } | |
334 | ||
5df7e6cb | 335 | if (value >= ((u64) 1 << obj_desc->common_field.bit_length)) { |
1da177e4 LT |
336 | /* |
337 | * The Value is larger than the maximum value that can fit into | |
338 | * the register. | |
339 | */ | |
46dfb09c BM |
340 | ACPI_ERROR((AE_INFO, |
341 | "Index value 0x%8.8X%8.8X overflows field width 0x%X", | |
342 | ACPI_FORMAT_UINT64(value), | |
343 | obj_desc->common_field.bit_length)); | |
344 | ||
1da177e4 LT |
345 | return (TRUE); |
346 | } | |
347 | ||
348 | /* The Value will fit into the field with no truncation */ | |
349 | ||
350 | return (FALSE); | |
351 | } | |
352 | ||
1da177e4 LT |
353 | /******************************************************************************* |
354 | * | |
355 | * FUNCTION: acpi_ex_field_datum_io | |
356 | * | |
44f6c012 | 357 | * PARAMETERS: obj_desc - Field to be read |
1da177e4 LT |
358 | * field_datum_byte_offset - Byte offset of this datum within the |
359 | * parent field | |
ba494bee | 360 | * value - Where to store value (must be 64 bits) |
1da177e4 LT |
361 | * read_write - Read or Write flag |
362 | * | |
363 | * RETURN: Status | |
364 | * | |
73a3090a | 365 | * DESCRIPTION: Read or Write a single datum of a field. The field_type is |
1da177e4 LT |
366 | * demultiplexed here to handle the different types of fields |
367 | * (buffer_field, region_field, index_field, bank_field) | |
368 | * | |
369 | ******************************************************************************/ | |
370 | ||
44f6c012 | 371 | static acpi_status |
4be44fcd | 372 | acpi_ex_field_datum_io(union acpi_operand_object *obj_desc, |
5df7e6cb | 373 | u32 field_datum_byte_offset, u64 *value, u32 read_write) |
1da177e4 | 374 | { |
4be44fcd | 375 | acpi_status status; |
5df7e6cb | 376 | u64 local_value; |
1da177e4 | 377 | |
b229cf92 | 378 | ACPI_FUNCTION_TRACE_U32(ex_field_datum_io, field_datum_byte_offset); |
1da177e4 LT |
379 | |
380 | if (read_write == ACPI_READ) { | |
381 | if (!value) { | |
382 | local_value = 0; | |
44f6c012 RM |
383 | |
384 | /* To support reads without saving return value */ | |
385 | value = &local_value; | |
1da177e4 LT |
386 | } |
387 | ||
388 | /* Clear the entire return buffer first, [Very Important!] */ | |
389 | ||
390 | *value = 0; | |
391 | } | |
392 | ||
393 | /* | |
394 | * The four types of fields are: | |
395 | * | |
396 | * buffer_field - Read/write from/to a Buffer | |
397 | * region_field - Read/write from/to a Operation Region. | |
44f6c012 RM |
398 | * bank_field - Write to a Bank Register, then read/write from/to an |
399 | * operation_region | |
400 | * index_field - Write to an Index Register, then read/write from/to a | |
401 | * Data Register | |
1da177e4 | 402 | */ |
3371c19c | 403 | switch (obj_desc->common.type) { |
1da177e4 LT |
404 | case ACPI_TYPE_BUFFER_FIELD: |
405 | /* | |
406 | * If the buffer_field arguments have not been previously evaluated, | |
407 | * evaluate them now and save the results. | |
408 | */ | |
409 | if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) { | |
4be44fcd LB |
410 | status = acpi_ds_get_buffer_field_arguments(obj_desc); |
411 | if (ACPI_FAILURE(status)) { | |
412 | return_ACPI_STATUS(status); | |
1da177e4 LT |
413 | } |
414 | } | |
415 | ||
416 | if (read_write == ACPI_READ) { | |
417 | /* | |
418 | * Copy the data from the source buffer. | |
419 | * Length is the field width in bytes. | |
420 | */ | |
4be44fcd LB |
421 | ACPI_MEMCPY(value, |
422 | (obj_desc->buffer_field.buffer_obj)->buffer. | |
423 | pointer + | |
424 | obj_desc->buffer_field.base_byte_offset + | |
425 | field_datum_byte_offset, | |
426 | obj_desc->common_field.access_byte_width); | |
427 | } else { | |
1da177e4 LT |
428 | /* |
429 | * Copy the data to the target buffer. | |
430 | * Length is the field width in bytes. | |
431 | */ | |
4be44fcd LB |
432 | ACPI_MEMCPY((obj_desc->buffer_field.buffer_obj)->buffer. |
433 | pointer + | |
434 | obj_desc->buffer_field.base_byte_offset + | |
435 | field_datum_byte_offset, value, | |
436 | obj_desc->common_field.access_byte_width); | |
1da177e4 LT |
437 | } |
438 | ||
439 | status = AE_OK; | |
440 | break; | |
441 | ||
1da177e4 | 442 | case ACPI_TYPE_LOCAL_BANK_FIELD: |
44f6c012 RM |
443 | /* |
444 | * Ensure that the bank_value is not beyond the capacity of | |
445 | * the register | |
446 | */ | |
4be44fcd | 447 | if (acpi_ex_register_overflow(obj_desc->bank_field.bank_obj, |
5df7e6cb BM |
448 | (u64) obj_desc->bank_field. |
449 | value)) { | |
4be44fcd | 450 | return_ACPI_STATUS(AE_AML_REGISTER_LIMIT); |
1da177e4 LT |
451 | } |
452 | ||
453 | /* | |
454 | * For bank_fields, we must write the bank_value to the bank_register | |
455 | * (itself a region_field) before we can access the data. | |
456 | */ | |
4be44fcd LB |
457 | status = |
458 | acpi_ex_insert_into_field(obj_desc->bank_field.bank_obj, | |
459 | &obj_desc->bank_field.value, | |
460 | sizeof(obj_desc->bank_field. | |
461 | value)); | |
462 | if (ACPI_FAILURE(status)) { | |
463 | return_ACPI_STATUS(status); | |
1da177e4 LT |
464 | } |
465 | ||
466 | /* | |
467 | * Now that the Bank has been selected, fall through to the | |
468 | * region_field case and write the datum to the Operation Region | |
469 | */ | |
470 | ||
471 | /*lint -fallthrough */ | |
472 | ||
1da177e4 LT |
473 | case ACPI_TYPE_LOCAL_REGION_FIELD: |
474 | /* | |
475 | * For simple region_fields, we just directly access the owning | |
476 | * Operation Region. | |
477 | */ | |
4be44fcd LB |
478 | status = |
479 | acpi_ex_access_region(obj_desc, field_datum_byte_offset, | |
480 | value, read_write); | |
1da177e4 LT |
481 | break; |
482 | ||
1da177e4 | 483 | case ACPI_TYPE_LOCAL_INDEX_FIELD: |
44f6c012 RM |
484 | /* |
485 | * Ensure that the index_value is not beyond the capacity of | |
486 | * the register | |
487 | */ | |
4be44fcd | 488 | if (acpi_ex_register_overflow(obj_desc->index_field.index_obj, |
5df7e6cb BM |
489 | (u64) obj_desc->index_field. |
490 | value)) { | |
4be44fcd | 491 | return_ACPI_STATUS(AE_AML_REGISTER_LIMIT); |
1da177e4 LT |
492 | } |
493 | ||
494 | /* Write the index value to the index_register (itself a region_field) */ | |
495 | ||
496 | field_datum_byte_offset += obj_desc->index_field.value; | |
497 | ||
4be44fcd LB |
498 | ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, |
499 | "Write to Index Register: Value %8.8X\n", | |
500 | field_datum_byte_offset)); | |
1da177e4 | 501 | |
4be44fcd LB |
502 | status = |
503 | acpi_ex_insert_into_field(obj_desc->index_field.index_obj, | |
504 | &field_datum_byte_offset, | |
505 | sizeof(field_datum_byte_offset)); | |
506 | if (ACPI_FAILURE(status)) { | |
507 | return_ACPI_STATUS(status); | |
1da177e4 LT |
508 | } |
509 | ||
1da177e4 | 510 | if (read_write == ACPI_READ) { |
52fc0b02 | 511 | |
1da177e4 LT |
512 | /* Read the datum from the data_register */ |
513 | ||
e9a8c6a9 BM |
514 | ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, |
515 | "Read from Data Register\n")); | |
516 | ||
4be44fcd LB |
517 | status = |
518 | acpi_ex_extract_from_field(obj_desc->index_field. | |
519 | data_obj, value, | |
5df7e6cb | 520 | sizeof(u64)); |
4be44fcd | 521 | } else { |
1da177e4 LT |
522 | /* Write the datum to the data_register */ |
523 | ||
e9a8c6a9 BM |
524 | ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, |
525 | "Write to Data Register: Value %8.8X%8.8X\n", | |
526 | ACPI_FORMAT_UINT64(*value))); | |
527 | ||
4be44fcd LB |
528 | status = |
529 | acpi_ex_insert_into_field(obj_desc->index_field. | |
530 | data_obj, value, | |
5df7e6cb | 531 | sizeof(u64)); |
1da177e4 LT |
532 | } |
533 | break; | |
534 | ||
1da177e4 LT |
535 | default: |
536 | ||
f6a22b0b | 537 | ACPI_ERROR((AE_INFO, "Wrong object type in field I/O %u", |
3371c19c | 538 | obj_desc->common.type)); |
1da177e4 LT |
539 | status = AE_AML_INTERNAL; |
540 | break; | |
541 | } | |
542 | ||
4be44fcd | 543 | if (ACPI_SUCCESS(status)) { |
1da177e4 | 544 | if (read_write == ACPI_READ) { |
4be44fcd | 545 | ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, |
b27d6597 | 546 | "Value Read %8.8X%8.8X, Width %u\n", |
4be44fcd LB |
547 | ACPI_FORMAT_UINT64(*value), |
548 | obj_desc->common_field. | |
549 | access_byte_width)); | |
550 | } else { | |
551 | ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, | |
b27d6597 | 552 | "Value Written %8.8X%8.8X, Width %u\n", |
4be44fcd LB |
553 | ACPI_FORMAT_UINT64(*value), |
554 | obj_desc->common_field. | |
555 | access_byte_width)); | |
1da177e4 LT |
556 | } |
557 | } | |
558 | ||
4be44fcd | 559 | return_ACPI_STATUS(status); |
1da177e4 LT |
560 | } |
561 | ||
1da177e4 LT |
562 | /******************************************************************************* |
563 | * | |
564 | * FUNCTION: acpi_ex_write_with_update_rule | |
565 | * | |
44f6c012 | 566 | * PARAMETERS: obj_desc - Field to be written |
ba494bee | 567 | * mask - bitmask within field datum |
44f6c012 RM |
568 | * field_value - Value to write |
569 | * field_datum_byte_offset - Offset of datum within field | |
1da177e4 LT |
570 | * |
571 | * RETURN: Status | |
572 | * | |
573 | * DESCRIPTION: Apply the field update rule to a field write | |
574 | * | |
575 | ******************************************************************************/ | |
576 | ||
577 | acpi_status | |
4be44fcd | 578 | acpi_ex_write_with_update_rule(union acpi_operand_object *obj_desc, |
5df7e6cb BM |
579 | u64 mask, |
580 | u64 field_value, u32 field_datum_byte_offset) | |
1da177e4 | 581 | { |
4be44fcd | 582 | acpi_status status = AE_OK; |
5df7e6cb BM |
583 | u64 merged_value; |
584 | u64 current_value; | |
1da177e4 | 585 | |
b229cf92 | 586 | ACPI_FUNCTION_TRACE_U32(ex_write_with_update_rule, mask); |
1da177e4 LT |
587 | |
588 | /* Start with the new bits */ | |
589 | ||
590 | merged_value = field_value; | |
591 | ||
592 | /* If the mask is all ones, we don't need to worry about the update rule */ | |
593 | ||
5df7e6cb | 594 | if (mask != ACPI_UINT64_MAX) { |
52fc0b02 | 595 | |
1da177e4 LT |
596 | /* Decode the update rule */ |
597 | ||
4be44fcd LB |
598 | switch (obj_desc->common_field. |
599 | field_flags & AML_FIELD_UPDATE_RULE_MASK) { | |
1da177e4 LT |
600 | case AML_FIELD_UPDATE_PRESERVE: |
601 | /* | |
602 | * Check if update rule needs to be applied (not if mask is all | |
603 | * ones) The left shift drops the bits we want to ignore. | |
604 | */ | |
4be44fcd LB |
605 | if ((~mask << (ACPI_MUL_8(sizeof(mask)) - |
606 | ACPI_MUL_8(obj_desc->common_field. | |
607 | access_byte_width))) != 0) { | |
1da177e4 LT |
608 | /* |
609 | * Read the current contents of the byte/word/dword containing | |
610 | * the field, and merge with the new field value. | |
611 | */ | |
4be44fcd LB |
612 | status = |
613 | acpi_ex_field_datum_io(obj_desc, | |
614 | field_datum_byte_offset, | |
615 | ¤t_value, | |
616 | ACPI_READ); | |
617 | if (ACPI_FAILURE(status)) { | |
618 | return_ACPI_STATUS(status); | |
1da177e4 LT |
619 | } |
620 | ||
621 | merged_value |= (current_value & ~mask); | |
622 | } | |
623 | break; | |
624 | ||
625 | case AML_FIELD_UPDATE_WRITE_AS_ONES: | |
626 | ||
627 | /* Set positions outside the field to all ones */ | |
628 | ||
629 | merged_value |= ~mask; | |
630 | break; | |
631 | ||
632 | case AML_FIELD_UPDATE_WRITE_AS_ZEROS: | |
633 | ||
634 | /* Set positions outside the field to all zeros */ | |
635 | ||
636 | merged_value &= mask; | |
637 | break; | |
638 | ||
639 | default: | |
640 | ||
b8e4d893 | 641 | ACPI_ERROR((AE_INFO, |
f6a22b0b | 642 | "Unknown UpdateRule value: 0x%X", |
b8e4d893 BM |
643 | (obj_desc->common_field. |
644 | field_flags & | |
645 | AML_FIELD_UPDATE_RULE_MASK))); | |
4be44fcd | 646 | return_ACPI_STATUS(AE_AML_OPERAND_VALUE); |
1da177e4 LT |
647 | } |
648 | } | |
649 | ||
4be44fcd | 650 | ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, |
b229cf92 | 651 | "Mask %8.8X%8.8X, DatumOffset %X, Width %X, Value %8.8X%8.8X, MergedValue %8.8X%8.8X\n", |
4be44fcd LB |
652 | ACPI_FORMAT_UINT64(mask), |
653 | field_datum_byte_offset, | |
654 | obj_desc->common_field.access_byte_width, | |
655 | ACPI_FORMAT_UINT64(field_value), | |
656 | ACPI_FORMAT_UINT64(merged_value))); | |
1da177e4 LT |
657 | |
658 | /* Write the merged value */ | |
659 | ||
4be44fcd LB |
660 | status = acpi_ex_field_datum_io(obj_desc, field_datum_byte_offset, |
661 | &merged_value, ACPI_WRITE); | |
1da177e4 | 662 | |
4be44fcd | 663 | return_ACPI_STATUS(status); |
1da177e4 LT |
664 | } |
665 | ||
1da177e4 LT |
666 | /******************************************************************************* |
667 | * | |
668 | * FUNCTION: acpi_ex_extract_from_field | |
669 | * | |
670 | * PARAMETERS: obj_desc - Field to be read | |
ba494bee | 671 | * buffer - Where to store the field data |
1da177e4 LT |
672 | * buffer_length - Length of Buffer |
673 | * | |
674 | * RETURN: Status | |
675 | * | |
676 | * DESCRIPTION: Retrieve the current value of the given field | |
677 | * | |
678 | ******************************************************************************/ | |
679 | ||
680 | acpi_status | |
4be44fcd LB |
681 | acpi_ex_extract_from_field(union acpi_operand_object *obj_desc, |
682 | void *buffer, u32 buffer_length) | |
1da177e4 | 683 | { |
4be44fcd | 684 | acpi_status status; |
5df7e6cb BM |
685 | u64 raw_datum; |
686 | u64 merged_datum; | |
4be44fcd LB |
687 | u32 field_offset = 0; |
688 | u32 buffer_offset = 0; | |
689 | u32 buffer_tail_bits; | |
690 | u32 datum_count; | |
691 | u32 field_datum_count; | |
09387b43 | 692 | u32 access_bit_width; |
4be44fcd LB |
693 | u32 i; |
694 | ||
b229cf92 | 695 | ACPI_FUNCTION_TRACE(ex_extract_from_field); |
1da177e4 LT |
696 | |
697 | /* Validate target buffer and clear it */ | |
698 | ||
4be44fcd LB |
699 | if (buffer_length < |
700 | ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->common_field.bit_length)) { | |
b8e4d893 | 701 | ACPI_ERROR((AE_INFO, |
f6a22b0b | 702 | "Field size %u (bits) is too large for buffer (%u)", |
b8e4d893 | 703 | obj_desc->common_field.bit_length, buffer_length)); |
1da177e4 | 704 | |
4be44fcd | 705 | return_ACPI_STATUS(AE_BUFFER_OVERFLOW); |
1da177e4 | 706 | } |
09387b43 | 707 | |
4be44fcd | 708 | ACPI_MEMSET(buffer, 0, buffer_length); |
09387b43 BM |
709 | access_bit_width = ACPI_MUL_8(obj_desc->common_field.access_byte_width); |
710 | ||
711 | /* Handle the simple case here */ | |
712 | ||
713 | if ((obj_desc->common_field.start_field_bit_offset == 0) && | |
714 | (obj_desc->common_field.bit_length == access_bit_width)) { | |
61388f9e BM |
715 | if (buffer_length >= sizeof(u64)) { |
716 | status = | |
717 | acpi_ex_field_datum_io(obj_desc, 0, buffer, | |
718 | ACPI_READ); | |
719 | } else { | |
720 | /* Use raw_datum (u64) to handle buffers < 64 bits */ | |
721 | ||
722 | status = | |
723 | acpi_ex_field_datum_io(obj_desc, 0, &raw_datum, | |
724 | ACPI_READ); | |
725 | ACPI_MEMCPY(buffer, &raw_datum, buffer_length); | |
726 | } | |
727 | ||
09387b43 BM |
728 | return_ACPI_STATUS(status); |
729 | } | |
730 | ||
731 | /* TBD: Move to common setup code */ | |
732 | ||
733 | /* Field algorithm is limited to sizeof(u64), truncate if needed */ | |
734 | ||
735 | if (obj_desc->common_field.access_byte_width > sizeof(u64)) { | |
736 | obj_desc->common_field.access_byte_width = sizeof(u64); | |
737 | access_bit_width = sizeof(u64) * 8; | |
738 | } | |
1da177e4 LT |
739 | |
740 | /* Compute the number of datums (access width data items) */ | |
741 | ||
09387b43 BM |
742 | datum_count = |
743 | ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length, | |
744 | access_bit_width); | |
745 | ||
4be44fcd LB |
746 | field_datum_count = ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length + |
747 | obj_desc->common_field. | |
748 | start_field_bit_offset, | |
4be44fcd | 749 | access_bit_width); |
1da177e4 LT |
750 | |
751 | /* Priming read from the field */ | |
752 | ||
4be44fcd LB |
753 | status = |
754 | acpi_ex_field_datum_io(obj_desc, field_offset, &raw_datum, | |
755 | ACPI_READ); | |
756 | if (ACPI_FAILURE(status)) { | |
757 | return_ACPI_STATUS(status); | |
1da177e4 | 758 | } |
4be44fcd LB |
759 | merged_datum = |
760 | raw_datum >> obj_desc->common_field.start_field_bit_offset; | |
1da177e4 LT |
761 | |
762 | /* Read the rest of the field */ | |
763 | ||
764 | for (i = 1; i < field_datum_count; i++) { | |
52fc0b02 | 765 | |
1da177e4 LT |
766 | /* Get next input datum from the field */ |
767 | ||
768 | field_offset += obj_desc->common_field.access_byte_width; | |
4be44fcd LB |
769 | status = acpi_ex_field_datum_io(obj_desc, field_offset, |
770 | &raw_datum, ACPI_READ); | |
771 | if (ACPI_FAILURE(status)) { | |
772 | return_ACPI_STATUS(status); | |
1da177e4 LT |
773 | } |
774 | ||
967440e3 BM |
775 | /* |
776 | * Merge with previous datum if necessary. | |
777 | * | |
778 | * Note: Before the shift, check if the shift value will be larger than | |
779 | * the integer size. If so, there is no need to perform the operation. | |
780 | * This avoids the differences in behavior between different compilers | |
781 | * concerning shift values larger than the target data width. | |
782 | */ | |
09387b43 BM |
783 | if (access_bit_width - |
784 | obj_desc->common_field.start_field_bit_offset < | |
967440e3 BM |
785 | ACPI_INTEGER_BIT_SIZE) { |
786 | merged_datum |= | |
09387b43 | 787 | raw_datum << (access_bit_width - |
967440e3 BM |
788 | obj_desc->common_field. |
789 | start_field_bit_offset); | |
790 | } | |
1da177e4 LT |
791 | |
792 | if (i == datum_count) { | |
793 | break; | |
794 | } | |
795 | ||
796 | /* Write merged datum to target buffer */ | |
797 | ||
4be44fcd LB |
798 | ACPI_MEMCPY(((char *)buffer) + buffer_offset, &merged_datum, |
799 | ACPI_MIN(obj_desc->common_field.access_byte_width, | |
800 | buffer_length - buffer_offset)); | |
1da177e4 LT |
801 | |
802 | buffer_offset += obj_desc->common_field.access_byte_width; | |
4be44fcd LB |
803 | merged_datum = |
804 | raw_datum >> obj_desc->common_field.start_field_bit_offset; | |
1da177e4 LT |
805 | } |
806 | ||
807 | /* Mask off any extra bits in the last datum */ | |
808 | ||
09387b43 | 809 | buffer_tail_bits = obj_desc->common_field.bit_length % access_bit_width; |
1da177e4 | 810 | if (buffer_tail_bits) { |
4be44fcd | 811 | merged_datum &= ACPI_MASK_BITS_ABOVE(buffer_tail_bits); |
1da177e4 LT |
812 | } |
813 | ||
814 | /* Write the last datum to the buffer */ | |
815 | ||
4be44fcd LB |
816 | ACPI_MEMCPY(((char *)buffer) + buffer_offset, &merged_datum, |
817 | ACPI_MIN(obj_desc->common_field.access_byte_width, | |
818 | buffer_length - buffer_offset)); | |
1da177e4 | 819 | |
4be44fcd | 820 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
821 | } |
822 | ||
1da177e4 LT |
823 | /******************************************************************************* |
824 | * | |
825 | * FUNCTION: acpi_ex_insert_into_field | |
826 | * | |
827 | * PARAMETERS: obj_desc - Field to be written | |
ba494bee | 828 | * buffer - Data to be written |
1da177e4 LT |
829 | * buffer_length - Length of Buffer |
830 | * | |
831 | * RETURN: Status | |
832 | * | |
833 | * DESCRIPTION: Store the Buffer contents into the given field | |
834 | * | |
835 | ******************************************************************************/ | |
836 | ||
837 | acpi_status | |
4be44fcd LB |
838 | acpi_ex_insert_into_field(union acpi_operand_object *obj_desc, |
839 | void *buffer, u32 buffer_length) | |
1da177e4 | 840 | { |
09387b43 | 841 | void *new_buffer; |
4be44fcd | 842 | acpi_status status; |
5df7e6cb BM |
843 | u64 mask; |
844 | u64 width_mask; | |
845 | u64 merged_datum; | |
846 | u64 raw_datum = 0; | |
4be44fcd LB |
847 | u32 field_offset = 0; |
848 | u32 buffer_offset = 0; | |
849 | u32 buffer_tail_bits; | |
850 | u32 datum_count; | |
851 | u32 field_datum_count; | |
09387b43 | 852 | u32 access_bit_width; |
9aa6169f | 853 | u32 required_length; |
09387b43 | 854 | u32 i; |
4be44fcd | 855 | |
b229cf92 | 856 | ACPI_FUNCTION_TRACE(ex_insert_into_field); |
1da177e4 LT |
857 | |
858 | /* Validate input buffer */ | |
859 | ||
9aa6169f BM |
860 | new_buffer = NULL; |
861 | required_length = | |
862 | ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->common_field.bit_length); | |
863 | /* | |
864 | * We must have a buffer that is at least as long as the field | |
73a3090a | 865 | * we are writing to. This is because individual fields are |
9aa6169f BM |
866 | * indivisible and partial writes are not supported -- as per |
867 | * the ACPI specification. | |
868 | */ | |
869 | if (buffer_length < required_length) { | |
1da177e4 | 870 | |
9aa6169f BM |
871 | /* We need to create a new buffer */ |
872 | ||
873 | new_buffer = ACPI_ALLOCATE_ZEROED(required_length); | |
874 | if (!new_buffer) { | |
875 | return_ACPI_STATUS(AE_NO_MEMORY); | |
876 | } | |
877 | ||
878 | /* | |
879 | * Copy the original data to the new buffer, starting | |
73a3090a | 880 | * at Byte zero. All unused (upper) bytes of the |
9aa6169f BM |
881 | * buffer will be 0. |
882 | */ | |
883 | ACPI_MEMCPY((char *)new_buffer, (char *)buffer, buffer_length); | |
884 | buffer = new_buffer; | |
885 | buffer_length = required_length; | |
1da177e4 LT |
886 | } |
887 | ||
09387b43 BM |
888 | /* TBD: Move to common setup code */ |
889 | ||
890 | /* Algo is limited to sizeof(u64), so cut the access_byte_width */ | |
891 | if (obj_desc->common_field.access_byte_width > sizeof(u64)) { | |
892 | obj_desc->common_field.access_byte_width = sizeof(u64); | |
893 | } | |
894 | ||
895 | access_bit_width = ACPI_MUL_8(obj_desc->common_field.access_byte_width); | |
896 | ||
967440e3 BM |
897 | /* |
898 | * Create the bitmasks used for bit insertion. | |
899 | * Note: This if/else is used to bypass compiler differences with the | |
900 | * shift operator | |
901 | */ | |
09387b43 | 902 | if (access_bit_width == ACPI_INTEGER_BIT_SIZE) { |
5df7e6cb | 903 | width_mask = ACPI_UINT64_MAX; |
967440e3 | 904 | } else { |
09387b43 | 905 | width_mask = ACPI_MASK_BITS_ABOVE(access_bit_width); |
967440e3 | 906 | } |
1da177e4 | 907 | |
967440e3 BM |
908 | mask = width_mask & |
909 | ACPI_MASK_BITS_BELOW(obj_desc->common_field.start_field_bit_offset); | |
910 | ||
911 | /* Compute the number of datums (access width data items) */ | |
4119532c BM |
912 | |
913 | datum_count = ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length, | |
09387b43 | 914 | access_bit_width); |
4119532c BM |
915 | |
916 | field_datum_count = ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length + | |
917 | obj_desc->common_field. | |
918 | start_field_bit_offset, | |
4119532c | 919 | access_bit_width); |
1da177e4 LT |
920 | |
921 | /* Get initial Datum from the input buffer */ | |
922 | ||
4be44fcd LB |
923 | ACPI_MEMCPY(&raw_datum, buffer, |
924 | ACPI_MIN(obj_desc->common_field.access_byte_width, | |
925 | buffer_length - buffer_offset)); | |
1da177e4 | 926 | |
4be44fcd LB |
927 | merged_datum = |
928 | raw_datum << obj_desc->common_field.start_field_bit_offset; | |
1da177e4 LT |
929 | |
930 | /* Write the entire field */ | |
931 | ||
932 | for (i = 1; i < field_datum_count; i++) { | |
52fc0b02 | 933 | |
1da177e4 LT |
934 | /* Write merged datum to the target field */ |
935 | ||
936 | merged_datum &= mask; | |
4be44fcd LB |
937 | status = acpi_ex_write_with_update_rule(obj_desc, mask, |
938 | merged_datum, | |
939 | field_offset); | |
940 | if (ACPI_FAILURE(status)) { | |
9aa6169f | 941 | goto exit; |
1da177e4 LT |
942 | } |
943 | ||
1da177e4 | 944 | field_offset += obj_desc->common_field.access_byte_width; |
967440e3 BM |
945 | |
946 | /* | |
947 | * Start new output datum by merging with previous input datum | |
948 | * if necessary. | |
949 | * | |
950 | * Note: Before the shift, check if the shift value will be larger than | |
951 | * the integer size. If so, there is no need to perform the operation. | |
952 | * This avoids the differences in behavior between different compilers | |
953 | * concerning shift values larger than the target data width. | |
954 | */ | |
09387b43 | 955 | if ((access_bit_width - |
967440e3 BM |
956 | obj_desc->common_field.start_field_bit_offset) < |
957 | ACPI_INTEGER_BIT_SIZE) { | |
958 | merged_datum = | |
09387b43 | 959 | raw_datum >> (access_bit_width - |
967440e3 BM |
960 | obj_desc->common_field. |
961 | start_field_bit_offset); | |
962 | } else { | |
963 | merged_datum = 0; | |
964 | } | |
965 | ||
4c90ece2 | 966 | mask = width_mask; |
1da177e4 LT |
967 | |
968 | if (i == datum_count) { | |
969 | break; | |
970 | } | |
971 | ||
972 | /* Get the next input datum from the buffer */ | |
973 | ||
974 | buffer_offset += obj_desc->common_field.access_byte_width; | |
4be44fcd LB |
975 | ACPI_MEMCPY(&raw_datum, ((char *)buffer) + buffer_offset, |
976 | ACPI_MIN(obj_desc->common_field.access_byte_width, | |
977 | buffer_length - buffer_offset)); | |
09387b43 | 978 | |
4be44fcd LB |
979 | merged_datum |= |
980 | raw_datum << obj_desc->common_field.start_field_bit_offset; | |
1da177e4 LT |
981 | } |
982 | ||
983 | /* Mask off any extra bits in the last datum */ | |
984 | ||
985 | buffer_tail_bits = (obj_desc->common_field.bit_length + | |
4be44fcd | 986 | obj_desc->common_field.start_field_bit_offset) % |
09387b43 | 987 | access_bit_width; |
1da177e4 | 988 | if (buffer_tail_bits) { |
4be44fcd | 989 | mask &= ACPI_MASK_BITS_ABOVE(buffer_tail_bits); |
1da177e4 LT |
990 | } |
991 | ||
992 | /* Write the last datum to the field */ | |
993 | ||
994 | merged_datum &= mask; | |
4be44fcd LB |
995 | status = acpi_ex_write_with_update_rule(obj_desc, |
996 | mask, merged_datum, | |
997 | field_offset); | |
1da177e4 | 998 | |
10622bf8 | 999 | exit: |
9aa6169f BM |
1000 | /* Free temporary buffer if we used one */ |
1001 | ||
1002 | if (new_buffer) { | |
1003 | ACPI_FREE(new_buffer); | |
1004 | } | |
4be44fcd | 1005 | return_ACPI_STATUS(status); |
1da177e4 | 1006 | } |