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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: exfldio - Aml Field I/O | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
77848130 | 8 | * Copyright (C) 2000 - 2012, 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 | ||
7cb7f45c LB |
126 | /* Exit if Address/Length have been disallowed by the host OS */ |
127 | ||
128 | if (rgn_desc->common.flags & AOPOBJ_INVALID) { | |
129 | return_ACPI_STATUS(AE_AML_ILLEGAL_ADDRESS); | |
130 | } | |
131 | ||
b229cf92 | 132 | /* |
2da120b6 | 133 | * Exit now for SMBus, GSBus or IPMI address space, it has a non-linear |
09387b43 | 134 | * address space and the request cannot be directly validated |
b229cf92 | 135 | */ |
ec463666 | 136 | if (space_id == ACPI_ADR_SPACE_SMBUS || |
2da120b6 | 137 | space_id == ACPI_ADR_SPACE_GSBUS || |
ec463666 | 138 | space_id == ACPI_ADR_SPACE_IPMI) { |
52fc0b02 | 139 | |
6557a49a | 140 | /* SMBus or IPMI has a non-linear address space */ |
1da177e4 | 141 | |
4be44fcd | 142 | return_ACPI_STATUS(AE_OK); |
1da177e4 | 143 | } |
1da177e4 LT |
144 | #ifdef ACPI_UNDER_DEVELOPMENT |
145 | /* | |
146 | * If the Field access is any_acc, we can now compute the optimal | |
147 | * access (because we know know the length of the parent region) | |
148 | */ | |
149 | if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) { | |
4be44fcd LB |
150 | if (ACPI_FAILURE(status)) { |
151 | return_ACPI_STATUS(status); | |
1da177e4 LT |
152 | } |
153 | } | |
154 | #endif | |
155 | ||
156 | /* | |
73a3090a | 157 | * Validate the request. The entire request from the byte offset for a |
1da177e4 LT |
158 | * length of one field datum (access width) must fit within the region. |
159 | * (Region length is specified in bytes) | |
160 | */ | |
4119532c | 161 | if (rgn_desc->region.length < |
09387b43 | 162 | (obj_desc->common_field.base_byte_offset + field_datum_byte_offset + |
4119532c | 163 | obj_desc->common_field.access_byte_width)) { |
1da177e4 LT |
164 | if (acpi_gbl_enable_interpreter_slack) { |
165 | /* | |
166 | * Slack mode only: We will go ahead and allow access to this | |
167 | * field if it is within the region length rounded up to the next | |
67a119f9 | 168 | * access width boundary. acpi_size cast for 64-bit compile. |
1da177e4 | 169 | */ |
4be44fcd LB |
170 | if (ACPI_ROUND_UP(rgn_desc->region.length, |
171 | obj_desc->common_field. | |
172 | access_byte_width) >= | |
67a119f9 BM |
173 | ((acpi_size) obj_desc->common_field. |
174 | base_byte_offset + | |
175 | obj_desc->common_field.access_byte_width + | |
176 | field_datum_byte_offset)) { | |
4be44fcd | 177 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
178 | } |
179 | } | |
180 | ||
4be44fcd LB |
181 | if (rgn_desc->region.length < |
182 | obj_desc->common_field.access_byte_width) { | |
1da177e4 LT |
183 | /* |
184 | * This is the case where the access_type (acc_word, etc.) is wider | |
73a3090a | 185 | * than the region itself. For example, a region of length one |
1da177e4 LT |
186 | * byte, and a field with Dword access specified. |
187 | */ | |
b8e4d893 | 188 | ACPI_ERROR((AE_INFO, |
f6a22b0b | 189 | "Field [%4.4s] access width (%u bytes) too large for region [%4.4s] (length %u)", |
b8e4d893 BM |
190 | acpi_ut_get_node_name(obj_desc-> |
191 | common_field.node), | |
192 | obj_desc->common_field.access_byte_width, | |
193 | acpi_ut_get_node_name(rgn_desc->region. | |
194 | node), | |
195 | rgn_desc->region.length)); | |
1da177e4 LT |
196 | } |
197 | ||
198 | /* | |
199 | * Offset rounded up to next multiple of field width | |
200 | * exceeds region length, indicate an error | |
201 | */ | |
b8e4d893 | 202 | ACPI_ERROR((AE_INFO, |
f6a22b0b | 203 | "Field [%4.4s] Base+Offset+Width %u+%u+%u is beyond end of region [%4.4s] (length %u)", |
b8e4d893 BM |
204 | acpi_ut_get_node_name(obj_desc->common_field.node), |
205 | obj_desc->common_field.base_byte_offset, | |
206 | field_datum_byte_offset, | |
207 | obj_desc->common_field.access_byte_width, | |
208 | acpi_ut_get_node_name(rgn_desc->region.node), | |
209 | rgn_desc->region.length)); | |
4be44fcd LB |
210 | |
211 | return_ACPI_STATUS(AE_AML_REGION_LIMIT); | |
1da177e4 LT |
212 | } |
213 | ||
4be44fcd | 214 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
215 | } |
216 | ||
1da177e4 LT |
217 | /******************************************************************************* |
218 | * | |
219 | * FUNCTION: acpi_ex_access_region | |
220 | * | |
44f6c012 | 221 | * PARAMETERS: obj_desc - Field to be read |
1da177e4 LT |
222 | * field_datum_byte_offset - Byte offset of this datum within the |
223 | * parent field | |
ba494bee | 224 | * value - Where to store value (must at least |
5df7e6cb | 225 | * 64 bits) |
ba494bee | 226 | * function - Read or Write flag plus other region- |
1da177e4 LT |
227 | * dependent flags |
228 | * | |
229 | * RETURN: Status | |
230 | * | |
231 | * DESCRIPTION: Read or Write a single field datum to an Operation Region. | |
232 | * | |
233 | ******************************************************************************/ | |
234 | ||
235 | acpi_status | |
4be44fcd | 236 | acpi_ex_access_region(union acpi_operand_object *obj_desc, |
5df7e6cb | 237 | u32 field_datum_byte_offset, u64 *value, u32 function) |
1da177e4 | 238 | { |
4be44fcd LB |
239 | acpi_status status; |
240 | union acpi_operand_object *rgn_desc; | |
f5407af3 | 241 | u32 region_offset; |
1da177e4 | 242 | |
b229cf92 | 243 | ACPI_FUNCTION_TRACE(ex_access_region); |
1da177e4 LT |
244 | |
245 | /* | |
246 | * Ensure that the region operands are fully evaluated and verify | |
247 | * the validity of the request | |
248 | */ | |
4be44fcd LB |
249 | status = acpi_ex_setup_region(obj_desc, field_datum_byte_offset); |
250 | if (ACPI_FAILURE(status)) { | |
251 | return_ACPI_STATUS(status); | |
1da177e4 LT |
252 | } |
253 | ||
254 | /* | |
255 | * The physical address of this field datum is: | |
256 | * | |
257 | * 1) The base of the region, plus | |
258 | * 2) The base offset of the field, plus | |
259 | * 3) The current offset into the field | |
260 | */ | |
261 | rgn_desc = obj_desc->common_field.region_obj; | |
f5407af3 | 262 | region_offset = |
4be44fcd | 263 | obj_desc->common_field.base_byte_offset + field_datum_byte_offset; |
1da177e4 LT |
264 | |
265 | if ((function & ACPI_IO_MASK) == ACPI_READ) { | |
4be44fcd LB |
266 | ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, "[READ]")); |
267 | } else { | |
268 | ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, "[WRITE]")); | |
1da177e4 LT |
269 | } |
270 | ||
4be44fcd | 271 | ACPI_DEBUG_PRINT_RAW((ACPI_DB_BFIELD, |
f3d2e786 | 272 | " Region [%s:%X], Width %X, ByteBase %X, Offset %X at %p\n", |
4be44fcd LB |
273 | acpi_ut_get_region_name(rgn_desc->region. |
274 | space_id), | |
275 | rgn_desc->region.space_id, | |
276 | obj_desc->common_field.access_byte_width, | |
277 | obj_desc->common_field.base_byte_offset, | |
b7f9f042 | 278 | field_datum_byte_offset, ACPI_CAST_PTR(void, |
f5407af3 BM |
279 | (rgn_desc-> |
280 | region. | |
281 | address + | |
282 | region_offset)))); | |
1da177e4 LT |
283 | |
284 | /* Invoke the appropriate address_space/op_region handler */ | |
285 | ||
9ce81784 BM |
286 | status = acpi_ev_address_space_dispatch(rgn_desc, obj_desc, |
287 | function, region_offset, | |
288 | ACPI_MUL_8(obj_desc-> | |
289 | common_field. | |
290 | access_byte_width), | |
291 | value); | |
1da177e4 | 292 | |
4be44fcd | 293 | if (ACPI_FAILURE(status)) { |
1da177e4 | 294 | if (status == AE_NOT_IMPLEMENTED) { |
b8e4d893 | 295 | ACPI_ERROR((AE_INFO, |
1b74dfb2 | 296 | "Region %s (ID=%u) not implemented", |
b8e4d893 BM |
297 | acpi_ut_get_region_name(rgn_desc->region. |
298 | space_id), | |
299 | rgn_desc->region.space_id)); | |
4be44fcd | 300 | } else if (status == AE_NOT_EXIST) { |
b8e4d893 | 301 | ACPI_ERROR((AE_INFO, |
1b74dfb2 | 302 | "Region %s (ID=%u) has no handler", |
b8e4d893 BM |
303 | acpi_ut_get_region_name(rgn_desc->region. |
304 | space_id), | |
305 | rgn_desc->region.space_id)); | |
1da177e4 LT |
306 | } |
307 | } | |
308 | ||
4be44fcd | 309 | return_ACPI_STATUS(status); |
1da177e4 LT |
310 | } |
311 | ||
1da177e4 LT |
312 | /******************************************************************************* |
313 | * | |
314 | * FUNCTION: acpi_ex_register_overflow | |
315 | * | |
44f6c012 | 316 | * PARAMETERS: obj_desc - Register(Field) to be written |
ba494bee | 317 | * value - Value to be stored |
1da177e4 LT |
318 | * |
319 | * RETURN: TRUE if value overflows the field, FALSE otherwise | |
320 | * | |
321 | * DESCRIPTION: Check if a value is out of range of the field being written. | |
322 | * Used to check if the values written to Index and Bank registers | |
73a3090a | 323 | * are out of range. Normally, the value is simply truncated |
1da177e4 LT |
324 | * to fit the field, but this case is most likely a serious |
325 | * coding error in the ASL. | |
326 | * | |
327 | ******************************************************************************/ | |
328 | ||
44f6c012 | 329 | static u8 |
5df7e6cb | 330 | acpi_ex_register_overflow(union acpi_operand_object *obj_desc, u64 value) |
1da177e4 | 331 | { |
46dfb09c | 332 | ACPI_FUNCTION_NAME(ex_register_overflow); |
1da177e4 LT |
333 | |
334 | if (obj_desc->common_field.bit_length >= ACPI_INTEGER_BIT_SIZE) { | |
335 | /* | |
336 | * The field is large enough to hold the maximum integer, so we can | |
337 | * never overflow it. | |
338 | */ | |
339 | return (FALSE); | |
340 | } | |
341 | ||
5df7e6cb | 342 | if (value >= ((u64) 1 << obj_desc->common_field.bit_length)) { |
1da177e4 LT |
343 | /* |
344 | * The Value is larger than the maximum value that can fit into | |
345 | * the register. | |
346 | */ | |
46dfb09c BM |
347 | ACPI_ERROR((AE_INFO, |
348 | "Index value 0x%8.8X%8.8X overflows field width 0x%X", | |
349 | ACPI_FORMAT_UINT64(value), | |
350 | obj_desc->common_field.bit_length)); | |
351 | ||
1da177e4 LT |
352 | return (TRUE); |
353 | } | |
354 | ||
355 | /* The Value will fit into the field with no truncation */ | |
356 | ||
357 | return (FALSE); | |
358 | } | |
359 | ||
1da177e4 LT |
360 | /******************************************************************************* |
361 | * | |
362 | * FUNCTION: acpi_ex_field_datum_io | |
363 | * | |
44f6c012 | 364 | * PARAMETERS: obj_desc - Field to be read |
1da177e4 LT |
365 | * field_datum_byte_offset - Byte offset of this datum within the |
366 | * parent field | |
ba494bee | 367 | * value - Where to store value (must be 64 bits) |
1da177e4 LT |
368 | * read_write - Read or Write flag |
369 | * | |
370 | * RETURN: Status | |
371 | * | |
73a3090a | 372 | * DESCRIPTION: Read or Write a single datum of a field. The field_type is |
1da177e4 LT |
373 | * demultiplexed here to handle the different types of fields |
374 | * (buffer_field, region_field, index_field, bank_field) | |
375 | * | |
376 | ******************************************************************************/ | |
377 | ||
44f6c012 | 378 | static acpi_status |
4be44fcd | 379 | acpi_ex_field_datum_io(union acpi_operand_object *obj_desc, |
5df7e6cb | 380 | u32 field_datum_byte_offset, u64 *value, u32 read_write) |
1da177e4 | 381 | { |
4be44fcd | 382 | acpi_status status; |
5df7e6cb | 383 | u64 local_value; |
1da177e4 | 384 | |
b229cf92 | 385 | ACPI_FUNCTION_TRACE_U32(ex_field_datum_io, field_datum_byte_offset); |
1da177e4 LT |
386 | |
387 | if (read_write == ACPI_READ) { | |
388 | if (!value) { | |
389 | local_value = 0; | |
44f6c012 RM |
390 | |
391 | /* To support reads without saving return value */ | |
392 | value = &local_value; | |
1da177e4 LT |
393 | } |
394 | ||
395 | /* Clear the entire return buffer first, [Very Important!] */ | |
396 | ||
397 | *value = 0; | |
398 | } | |
399 | ||
400 | /* | |
401 | * The four types of fields are: | |
402 | * | |
403 | * buffer_field - Read/write from/to a Buffer | |
404 | * region_field - Read/write from/to a Operation Region. | |
44f6c012 RM |
405 | * bank_field - Write to a Bank Register, then read/write from/to an |
406 | * operation_region | |
407 | * index_field - Write to an Index Register, then read/write from/to a | |
408 | * Data Register | |
1da177e4 | 409 | */ |
3371c19c | 410 | switch (obj_desc->common.type) { |
1da177e4 LT |
411 | case ACPI_TYPE_BUFFER_FIELD: |
412 | /* | |
413 | * If the buffer_field arguments have not been previously evaluated, | |
414 | * evaluate them now and save the results. | |
415 | */ | |
416 | if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) { | |
4be44fcd LB |
417 | status = acpi_ds_get_buffer_field_arguments(obj_desc); |
418 | if (ACPI_FAILURE(status)) { | |
419 | return_ACPI_STATUS(status); | |
1da177e4 LT |
420 | } |
421 | } | |
422 | ||
423 | if (read_write == ACPI_READ) { | |
424 | /* | |
425 | * Copy the data from the source buffer. | |
426 | * Length is the field width in bytes. | |
427 | */ | |
4be44fcd LB |
428 | ACPI_MEMCPY(value, |
429 | (obj_desc->buffer_field.buffer_obj)->buffer. | |
430 | pointer + | |
431 | obj_desc->buffer_field.base_byte_offset + | |
432 | field_datum_byte_offset, | |
433 | obj_desc->common_field.access_byte_width); | |
434 | } else { | |
1da177e4 LT |
435 | /* |
436 | * Copy the data to the target buffer. | |
437 | * Length is the field width in bytes. | |
438 | */ | |
4be44fcd LB |
439 | ACPI_MEMCPY((obj_desc->buffer_field.buffer_obj)->buffer. |
440 | pointer + | |
441 | obj_desc->buffer_field.base_byte_offset + | |
442 | field_datum_byte_offset, value, | |
443 | obj_desc->common_field.access_byte_width); | |
1da177e4 LT |
444 | } |
445 | ||
446 | status = AE_OK; | |
447 | break; | |
448 | ||
1da177e4 LT |
449 | case ACPI_TYPE_LOCAL_BANK_FIELD: |
450 | ||
44f6c012 RM |
451 | /* |
452 | * Ensure that the bank_value is not beyond the capacity of | |
453 | * the register | |
454 | */ | |
4be44fcd | 455 | if (acpi_ex_register_overflow(obj_desc->bank_field.bank_obj, |
5df7e6cb BM |
456 | (u64) obj_desc->bank_field. |
457 | value)) { | |
4be44fcd | 458 | return_ACPI_STATUS(AE_AML_REGISTER_LIMIT); |
1da177e4 LT |
459 | } |
460 | ||
461 | /* | |
462 | * For bank_fields, we must write the bank_value to the bank_register | |
463 | * (itself a region_field) before we can access the data. | |
464 | */ | |
4be44fcd LB |
465 | status = |
466 | acpi_ex_insert_into_field(obj_desc->bank_field.bank_obj, | |
467 | &obj_desc->bank_field.value, | |
468 | sizeof(obj_desc->bank_field. | |
469 | value)); | |
470 | if (ACPI_FAILURE(status)) { | |
471 | return_ACPI_STATUS(status); | |
1da177e4 LT |
472 | } |
473 | ||
474 | /* | |
475 | * Now that the Bank has been selected, fall through to the | |
476 | * region_field case and write the datum to the Operation Region | |
477 | */ | |
478 | ||
479 | /*lint -fallthrough */ | |
480 | ||
1da177e4 LT |
481 | case ACPI_TYPE_LOCAL_REGION_FIELD: |
482 | /* | |
483 | * For simple region_fields, we just directly access the owning | |
484 | * Operation Region. | |
485 | */ | |
4be44fcd LB |
486 | status = |
487 | acpi_ex_access_region(obj_desc, field_datum_byte_offset, | |
488 | value, read_write); | |
1da177e4 LT |
489 | break; |
490 | ||
1da177e4 LT |
491 | case ACPI_TYPE_LOCAL_INDEX_FIELD: |
492 | ||
44f6c012 RM |
493 | /* |
494 | * Ensure that the index_value is not beyond the capacity of | |
495 | * the register | |
496 | */ | |
4be44fcd | 497 | if (acpi_ex_register_overflow(obj_desc->index_field.index_obj, |
5df7e6cb BM |
498 | (u64) obj_desc->index_field. |
499 | value)) { | |
4be44fcd | 500 | return_ACPI_STATUS(AE_AML_REGISTER_LIMIT); |
1da177e4 LT |
501 | } |
502 | ||
503 | /* Write the index value to the index_register (itself a region_field) */ | |
504 | ||
505 | field_datum_byte_offset += obj_desc->index_field.value; | |
506 | ||
4be44fcd LB |
507 | ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, |
508 | "Write to Index Register: Value %8.8X\n", | |
509 | field_datum_byte_offset)); | |
1da177e4 | 510 | |
4be44fcd LB |
511 | status = |
512 | acpi_ex_insert_into_field(obj_desc->index_field.index_obj, | |
513 | &field_datum_byte_offset, | |
514 | sizeof(field_datum_byte_offset)); | |
515 | if (ACPI_FAILURE(status)) { | |
516 | return_ACPI_STATUS(status); | |
1da177e4 LT |
517 | } |
518 | ||
1da177e4 | 519 | if (read_write == ACPI_READ) { |
52fc0b02 | 520 | |
1da177e4 LT |
521 | /* Read the datum from the data_register */ |
522 | ||
e9a8c6a9 BM |
523 | ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, |
524 | "Read from Data Register\n")); | |
525 | ||
4be44fcd LB |
526 | status = |
527 | acpi_ex_extract_from_field(obj_desc->index_field. | |
528 | data_obj, value, | |
5df7e6cb | 529 | sizeof(u64)); |
4be44fcd | 530 | } else { |
1da177e4 LT |
531 | /* Write the datum to the data_register */ |
532 | ||
e9a8c6a9 BM |
533 | ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, |
534 | "Write to Data Register: Value %8.8X%8.8X\n", | |
535 | ACPI_FORMAT_UINT64(*value))); | |
536 | ||
4be44fcd LB |
537 | status = |
538 | acpi_ex_insert_into_field(obj_desc->index_field. | |
539 | data_obj, value, | |
5df7e6cb | 540 | sizeof(u64)); |
1da177e4 LT |
541 | } |
542 | break; | |
543 | ||
1da177e4 LT |
544 | default: |
545 | ||
f6a22b0b | 546 | ACPI_ERROR((AE_INFO, "Wrong object type in field I/O %u", |
3371c19c | 547 | obj_desc->common.type)); |
1da177e4 LT |
548 | status = AE_AML_INTERNAL; |
549 | break; | |
550 | } | |
551 | ||
4be44fcd | 552 | if (ACPI_SUCCESS(status)) { |
1da177e4 | 553 | if (read_write == ACPI_READ) { |
4be44fcd | 554 | ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, |
b27d6597 | 555 | "Value Read %8.8X%8.8X, Width %u\n", |
4be44fcd LB |
556 | ACPI_FORMAT_UINT64(*value), |
557 | obj_desc->common_field. | |
558 | access_byte_width)); | |
559 | } else { | |
560 | ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, | |
b27d6597 | 561 | "Value Written %8.8X%8.8X, Width %u\n", |
4be44fcd LB |
562 | ACPI_FORMAT_UINT64(*value), |
563 | obj_desc->common_field. | |
564 | access_byte_width)); | |
1da177e4 LT |
565 | } |
566 | } | |
567 | ||
4be44fcd | 568 | return_ACPI_STATUS(status); |
1da177e4 LT |
569 | } |
570 | ||
1da177e4 LT |
571 | /******************************************************************************* |
572 | * | |
573 | * FUNCTION: acpi_ex_write_with_update_rule | |
574 | * | |
44f6c012 | 575 | * PARAMETERS: obj_desc - Field to be written |
ba494bee | 576 | * mask - bitmask within field datum |
44f6c012 RM |
577 | * field_value - Value to write |
578 | * field_datum_byte_offset - Offset of datum within field | |
1da177e4 LT |
579 | * |
580 | * RETURN: Status | |
581 | * | |
582 | * DESCRIPTION: Apply the field update rule to a field write | |
583 | * | |
584 | ******************************************************************************/ | |
585 | ||
586 | acpi_status | |
4be44fcd | 587 | acpi_ex_write_with_update_rule(union acpi_operand_object *obj_desc, |
5df7e6cb BM |
588 | u64 mask, |
589 | u64 field_value, u32 field_datum_byte_offset) | |
1da177e4 | 590 | { |
4be44fcd | 591 | acpi_status status = AE_OK; |
5df7e6cb BM |
592 | u64 merged_value; |
593 | u64 current_value; | |
1da177e4 | 594 | |
b229cf92 | 595 | ACPI_FUNCTION_TRACE_U32(ex_write_with_update_rule, mask); |
1da177e4 LT |
596 | |
597 | /* Start with the new bits */ | |
598 | ||
599 | merged_value = field_value; | |
600 | ||
601 | /* If the mask is all ones, we don't need to worry about the update rule */ | |
602 | ||
5df7e6cb | 603 | if (mask != ACPI_UINT64_MAX) { |
52fc0b02 | 604 | |
1da177e4 LT |
605 | /* Decode the update rule */ |
606 | ||
4be44fcd LB |
607 | switch (obj_desc->common_field. |
608 | field_flags & AML_FIELD_UPDATE_RULE_MASK) { | |
1da177e4 LT |
609 | case AML_FIELD_UPDATE_PRESERVE: |
610 | /* | |
611 | * Check if update rule needs to be applied (not if mask is all | |
612 | * ones) The left shift drops the bits we want to ignore. | |
613 | */ | |
4be44fcd LB |
614 | if ((~mask << (ACPI_MUL_8(sizeof(mask)) - |
615 | ACPI_MUL_8(obj_desc->common_field. | |
616 | access_byte_width))) != 0) { | |
1da177e4 LT |
617 | /* |
618 | * Read the current contents of the byte/word/dword containing | |
619 | * the field, and merge with the new field value. | |
620 | */ | |
4be44fcd LB |
621 | status = |
622 | acpi_ex_field_datum_io(obj_desc, | |
623 | field_datum_byte_offset, | |
624 | ¤t_value, | |
625 | ACPI_READ); | |
626 | if (ACPI_FAILURE(status)) { | |
627 | return_ACPI_STATUS(status); | |
1da177e4 LT |
628 | } |
629 | ||
630 | merged_value |= (current_value & ~mask); | |
631 | } | |
632 | break; | |
633 | ||
634 | case AML_FIELD_UPDATE_WRITE_AS_ONES: | |
635 | ||
636 | /* Set positions outside the field to all ones */ | |
637 | ||
638 | merged_value |= ~mask; | |
639 | break; | |
640 | ||
641 | case AML_FIELD_UPDATE_WRITE_AS_ZEROS: | |
642 | ||
643 | /* Set positions outside the field to all zeros */ | |
644 | ||
645 | merged_value &= mask; | |
646 | break; | |
647 | ||
648 | default: | |
649 | ||
b8e4d893 | 650 | ACPI_ERROR((AE_INFO, |
f6a22b0b | 651 | "Unknown UpdateRule value: 0x%X", |
b8e4d893 BM |
652 | (obj_desc->common_field. |
653 | field_flags & | |
654 | AML_FIELD_UPDATE_RULE_MASK))); | |
4be44fcd | 655 | return_ACPI_STATUS(AE_AML_OPERAND_VALUE); |
1da177e4 LT |
656 | } |
657 | } | |
658 | ||
4be44fcd | 659 | ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, |
b229cf92 | 660 | "Mask %8.8X%8.8X, DatumOffset %X, Width %X, Value %8.8X%8.8X, MergedValue %8.8X%8.8X\n", |
4be44fcd LB |
661 | ACPI_FORMAT_UINT64(mask), |
662 | field_datum_byte_offset, | |
663 | obj_desc->common_field.access_byte_width, | |
664 | ACPI_FORMAT_UINT64(field_value), | |
665 | ACPI_FORMAT_UINT64(merged_value))); | |
1da177e4 LT |
666 | |
667 | /* Write the merged value */ | |
668 | ||
4be44fcd LB |
669 | status = acpi_ex_field_datum_io(obj_desc, field_datum_byte_offset, |
670 | &merged_value, ACPI_WRITE); | |
1da177e4 | 671 | |
4be44fcd | 672 | return_ACPI_STATUS(status); |
1da177e4 LT |
673 | } |
674 | ||
1da177e4 LT |
675 | /******************************************************************************* |
676 | * | |
677 | * FUNCTION: acpi_ex_extract_from_field | |
678 | * | |
679 | * PARAMETERS: obj_desc - Field to be read | |
ba494bee | 680 | * buffer - Where to store the field data |
1da177e4 LT |
681 | * buffer_length - Length of Buffer |
682 | * | |
683 | * RETURN: Status | |
684 | * | |
685 | * DESCRIPTION: Retrieve the current value of the given field | |
686 | * | |
687 | ******************************************************************************/ | |
688 | ||
689 | acpi_status | |
4be44fcd LB |
690 | acpi_ex_extract_from_field(union acpi_operand_object *obj_desc, |
691 | void *buffer, u32 buffer_length) | |
1da177e4 | 692 | { |
4be44fcd | 693 | acpi_status status; |
5df7e6cb BM |
694 | u64 raw_datum; |
695 | u64 merged_datum; | |
4be44fcd LB |
696 | u32 field_offset = 0; |
697 | u32 buffer_offset = 0; | |
698 | u32 buffer_tail_bits; | |
699 | u32 datum_count; | |
700 | u32 field_datum_count; | |
09387b43 | 701 | u32 access_bit_width; |
4be44fcd LB |
702 | u32 i; |
703 | ||
b229cf92 | 704 | ACPI_FUNCTION_TRACE(ex_extract_from_field); |
1da177e4 LT |
705 | |
706 | /* Validate target buffer and clear it */ | |
707 | ||
4be44fcd LB |
708 | if (buffer_length < |
709 | ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->common_field.bit_length)) { | |
b8e4d893 | 710 | ACPI_ERROR((AE_INFO, |
f6a22b0b | 711 | "Field size %u (bits) is too large for buffer (%u)", |
b8e4d893 | 712 | obj_desc->common_field.bit_length, buffer_length)); |
1da177e4 | 713 | |
4be44fcd | 714 | return_ACPI_STATUS(AE_BUFFER_OVERFLOW); |
1da177e4 | 715 | } |
09387b43 | 716 | |
4be44fcd | 717 | ACPI_MEMSET(buffer, 0, buffer_length); |
09387b43 BM |
718 | access_bit_width = ACPI_MUL_8(obj_desc->common_field.access_byte_width); |
719 | ||
720 | /* Handle the simple case here */ | |
721 | ||
722 | if ((obj_desc->common_field.start_field_bit_offset == 0) && | |
723 | (obj_desc->common_field.bit_length == access_bit_width)) { | |
724 | status = acpi_ex_field_datum_io(obj_desc, 0, buffer, ACPI_READ); | |
725 | return_ACPI_STATUS(status); | |
726 | } | |
727 | ||
728 | /* TBD: Move to common setup code */ | |
729 | ||
730 | /* Field algorithm is limited to sizeof(u64), truncate if needed */ | |
731 | ||
732 | if (obj_desc->common_field.access_byte_width > sizeof(u64)) { | |
733 | obj_desc->common_field.access_byte_width = sizeof(u64); | |
734 | access_bit_width = sizeof(u64) * 8; | |
735 | } | |
1da177e4 LT |
736 | |
737 | /* Compute the number of datums (access width data items) */ | |
738 | ||
09387b43 BM |
739 | datum_count = |
740 | ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length, | |
741 | access_bit_width); | |
742 | ||
4be44fcd LB |
743 | field_datum_count = ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length + |
744 | obj_desc->common_field. | |
745 | start_field_bit_offset, | |
4be44fcd | 746 | access_bit_width); |
1da177e4 LT |
747 | |
748 | /* Priming read from the field */ | |
749 | ||
4be44fcd LB |
750 | status = |
751 | acpi_ex_field_datum_io(obj_desc, field_offset, &raw_datum, | |
752 | ACPI_READ); | |
753 | if (ACPI_FAILURE(status)) { | |
754 | return_ACPI_STATUS(status); | |
1da177e4 | 755 | } |
4be44fcd LB |
756 | merged_datum = |
757 | raw_datum >> obj_desc->common_field.start_field_bit_offset; | |
1da177e4 LT |
758 | |
759 | /* Read the rest of the field */ | |
760 | ||
761 | for (i = 1; i < field_datum_count; i++) { | |
52fc0b02 | 762 | |
1da177e4 LT |
763 | /* Get next input datum from the field */ |
764 | ||
765 | field_offset += obj_desc->common_field.access_byte_width; | |
4be44fcd LB |
766 | status = acpi_ex_field_datum_io(obj_desc, field_offset, |
767 | &raw_datum, ACPI_READ); | |
768 | if (ACPI_FAILURE(status)) { | |
769 | return_ACPI_STATUS(status); | |
1da177e4 LT |
770 | } |
771 | ||
967440e3 BM |
772 | /* |
773 | * Merge with previous datum if necessary. | |
774 | * | |
775 | * Note: Before the shift, check if the shift value will be larger than | |
776 | * the integer size. If so, there is no need to perform the operation. | |
777 | * This avoids the differences in behavior between different compilers | |
778 | * concerning shift values larger than the target data width. | |
779 | */ | |
09387b43 BM |
780 | if (access_bit_width - |
781 | obj_desc->common_field.start_field_bit_offset < | |
967440e3 BM |
782 | ACPI_INTEGER_BIT_SIZE) { |
783 | merged_datum |= | |
09387b43 | 784 | raw_datum << (access_bit_width - |
967440e3 BM |
785 | obj_desc->common_field. |
786 | start_field_bit_offset); | |
787 | } | |
1da177e4 LT |
788 | |
789 | if (i == datum_count) { | |
790 | break; | |
791 | } | |
792 | ||
793 | /* Write merged datum to target buffer */ | |
794 | ||
4be44fcd LB |
795 | ACPI_MEMCPY(((char *)buffer) + buffer_offset, &merged_datum, |
796 | ACPI_MIN(obj_desc->common_field.access_byte_width, | |
797 | buffer_length - buffer_offset)); | |
1da177e4 LT |
798 | |
799 | buffer_offset += obj_desc->common_field.access_byte_width; | |
4be44fcd LB |
800 | merged_datum = |
801 | raw_datum >> obj_desc->common_field.start_field_bit_offset; | |
1da177e4 LT |
802 | } |
803 | ||
804 | /* Mask off any extra bits in the last datum */ | |
805 | ||
09387b43 | 806 | buffer_tail_bits = obj_desc->common_field.bit_length % access_bit_width; |
1da177e4 | 807 | if (buffer_tail_bits) { |
4be44fcd | 808 | merged_datum &= ACPI_MASK_BITS_ABOVE(buffer_tail_bits); |
1da177e4 LT |
809 | } |
810 | ||
811 | /* Write the last datum to the buffer */ | |
812 | ||
4be44fcd LB |
813 | ACPI_MEMCPY(((char *)buffer) + buffer_offset, &merged_datum, |
814 | ACPI_MIN(obj_desc->common_field.access_byte_width, | |
815 | buffer_length - buffer_offset)); | |
1da177e4 | 816 | |
4be44fcd | 817 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
818 | } |
819 | ||
1da177e4 LT |
820 | /******************************************************************************* |
821 | * | |
822 | * FUNCTION: acpi_ex_insert_into_field | |
823 | * | |
824 | * PARAMETERS: obj_desc - Field to be written | |
ba494bee | 825 | * buffer - Data to be written |
1da177e4 LT |
826 | * buffer_length - Length of Buffer |
827 | * | |
828 | * RETURN: Status | |
829 | * | |
830 | * DESCRIPTION: Store the Buffer contents into the given field | |
831 | * | |
832 | ******************************************************************************/ | |
833 | ||
834 | acpi_status | |
4be44fcd LB |
835 | acpi_ex_insert_into_field(union acpi_operand_object *obj_desc, |
836 | void *buffer, u32 buffer_length) | |
1da177e4 | 837 | { |
09387b43 | 838 | void *new_buffer; |
4be44fcd | 839 | acpi_status status; |
5df7e6cb BM |
840 | u64 mask; |
841 | u64 width_mask; | |
842 | u64 merged_datum; | |
843 | u64 raw_datum = 0; | |
4be44fcd LB |
844 | u32 field_offset = 0; |
845 | u32 buffer_offset = 0; | |
846 | u32 buffer_tail_bits; | |
847 | u32 datum_count; | |
848 | u32 field_datum_count; | |
09387b43 | 849 | u32 access_bit_width; |
9aa6169f | 850 | u32 required_length; |
09387b43 | 851 | u32 i; |
4be44fcd | 852 | |
b229cf92 | 853 | ACPI_FUNCTION_TRACE(ex_insert_into_field); |
1da177e4 LT |
854 | |
855 | /* Validate input buffer */ | |
856 | ||
9aa6169f BM |
857 | new_buffer = NULL; |
858 | required_length = | |
859 | ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->common_field.bit_length); | |
860 | /* | |
861 | * We must have a buffer that is at least as long as the field | |
73a3090a | 862 | * we are writing to. This is because individual fields are |
9aa6169f BM |
863 | * indivisible and partial writes are not supported -- as per |
864 | * the ACPI specification. | |
865 | */ | |
866 | if (buffer_length < required_length) { | |
1da177e4 | 867 | |
9aa6169f BM |
868 | /* We need to create a new buffer */ |
869 | ||
870 | new_buffer = ACPI_ALLOCATE_ZEROED(required_length); | |
871 | if (!new_buffer) { | |
872 | return_ACPI_STATUS(AE_NO_MEMORY); | |
873 | } | |
874 | ||
875 | /* | |
876 | * Copy the original data to the new buffer, starting | |
73a3090a | 877 | * at Byte zero. All unused (upper) bytes of the |
9aa6169f BM |
878 | * buffer will be 0. |
879 | */ | |
880 | ACPI_MEMCPY((char *)new_buffer, (char *)buffer, buffer_length); | |
881 | buffer = new_buffer; | |
882 | buffer_length = required_length; | |
1da177e4 LT |
883 | } |
884 | ||
09387b43 BM |
885 | /* TBD: Move to common setup code */ |
886 | ||
887 | /* Algo is limited to sizeof(u64), so cut the access_byte_width */ | |
888 | if (obj_desc->common_field.access_byte_width > sizeof(u64)) { | |
889 | obj_desc->common_field.access_byte_width = sizeof(u64); | |
890 | } | |
891 | ||
892 | access_bit_width = ACPI_MUL_8(obj_desc->common_field.access_byte_width); | |
893 | ||
967440e3 BM |
894 | /* |
895 | * Create the bitmasks used for bit insertion. | |
896 | * Note: This if/else is used to bypass compiler differences with the | |
897 | * shift operator | |
898 | */ | |
09387b43 | 899 | if (access_bit_width == ACPI_INTEGER_BIT_SIZE) { |
5df7e6cb | 900 | width_mask = ACPI_UINT64_MAX; |
967440e3 | 901 | } else { |
09387b43 | 902 | width_mask = ACPI_MASK_BITS_ABOVE(access_bit_width); |
967440e3 | 903 | } |
1da177e4 | 904 | |
967440e3 BM |
905 | mask = width_mask & |
906 | ACPI_MASK_BITS_BELOW(obj_desc->common_field.start_field_bit_offset); | |
907 | ||
908 | /* Compute the number of datums (access width data items) */ | |
4119532c BM |
909 | |
910 | datum_count = ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length, | |
09387b43 | 911 | access_bit_width); |
4119532c BM |
912 | |
913 | field_datum_count = ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length + | |
914 | obj_desc->common_field. | |
915 | start_field_bit_offset, | |
4119532c | 916 | access_bit_width); |
1da177e4 LT |
917 | |
918 | /* Get initial Datum from the input buffer */ | |
919 | ||
4be44fcd LB |
920 | ACPI_MEMCPY(&raw_datum, buffer, |
921 | ACPI_MIN(obj_desc->common_field.access_byte_width, | |
922 | buffer_length - buffer_offset)); | |
1da177e4 | 923 | |
4be44fcd LB |
924 | merged_datum = |
925 | raw_datum << obj_desc->common_field.start_field_bit_offset; | |
1da177e4 LT |
926 | |
927 | /* Write the entire field */ | |
928 | ||
929 | for (i = 1; i < field_datum_count; i++) { | |
52fc0b02 | 930 | |
1da177e4 LT |
931 | /* Write merged datum to the target field */ |
932 | ||
933 | merged_datum &= mask; | |
4be44fcd LB |
934 | status = acpi_ex_write_with_update_rule(obj_desc, mask, |
935 | merged_datum, | |
936 | field_offset); | |
937 | if (ACPI_FAILURE(status)) { | |
9aa6169f | 938 | goto exit; |
1da177e4 LT |
939 | } |
940 | ||
1da177e4 | 941 | field_offset += obj_desc->common_field.access_byte_width; |
967440e3 BM |
942 | |
943 | /* | |
944 | * Start new output datum by merging with previous input datum | |
945 | * if necessary. | |
946 | * | |
947 | * Note: Before the shift, check if the shift value will be larger than | |
948 | * the integer size. If so, there is no need to perform the operation. | |
949 | * This avoids the differences in behavior between different compilers | |
950 | * concerning shift values larger than the target data width. | |
951 | */ | |
09387b43 | 952 | if ((access_bit_width - |
967440e3 BM |
953 | obj_desc->common_field.start_field_bit_offset) < |
954 | ACPI_INTEGER_BIT_SIZE) { | |
955 | merged_datum = | |
09387b43 | 956 | raw_datum >> (access_bit_width - |
967440e3 BM |
957 | obj_desc->common_field. |
958 | start_field_bit_offset); | |
959 | } else { | |
960 | merged_datum = 0; | |
961 | } | |
962 | ||
4c90ece2 | 963 | mask = width_mask; |
1da177e4 LT |
964 | |
965 | if (i == datum_count) { | |
966 | break; | |
967 | } | |
968 | ||
969 | /* Get the next input datum from the buffer */ | |
970 | ||
971 | buffer_offset += obj_desc->common_field.access_byte_width; | |
4be44fcd LB |
972 | ACPI_MEMCPY(&raw_datum, ((char *)buffer) + buffer_offset, |
973 | ACPI_MIN(obj_desc->common_field.access_byte_width, | |
974 | buffer_length - buffer_offset)); | |
09387b43 | 975 | |
4be44fcd LB |
976 | merged_datum |= |
977 | raw_datum << obj_desc->common_field.start_field_bit_offset; | |
1da177e4 LT |
978 | } |
979 | ||
980 | /* Mask off any extra bits in the last datum */ | |
981 | ||
982 | buffer_tail_bits = (obj_desc->common_field.bit_length + | |
4be44fcd | 983 | obj_desc->common_field.start_field_bit_offset) % |
09387b43 | 984 | access_bit_width; |
1da177e4 | 985 | if (buffer_tail_bits) { |
4be44fcd | 986 | mask &= ACPI_MASK_BITS_ABOVE(buffer_tail_bits); |
1da177e4 LT |
987 | } |
988 | ||
989 | /* Write the last datum to the field */ | |
990 | ||
991 | merged_datum &= mask; | |
4be44fcd LB |
992 | status = acpi_ex_write_with_update_rule(obj_desc, |
993 | mask, merged_datum, | |
994 | field_offset); | |
1da177e4 | 995 | |
9aa6169f BM |
996 | exit: |
997 | /* Free temporary buffer if we used one */ | |
998 | ||
999 | if (new_buffer) { | |
1000 | ACPI_FREE(new_buffer); | |
1001 | } | |
4be44fcd | 1002 | return_ACPI_STATUS(status); |
1da177e4 | 1003 | } |