Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: exfldio - Aml Field I/O | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
25f044e6 | 8 | * Copyright (C) 2000 - 2013, 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 LT |
331 | { |
332 | ||
333 | if (obj_desc->common_field.bit_length >= ACPI_INTEGER_BIT_SIZE) { | |
334 | /* | |
335 | * The field is large enough to hold the maximum integer, so we can | |
336 | * never overflow it. | |
337 | */ | |
338 | return (FALSE); | |
339 | } | |
340 | ||
5df7e6cb | 341 | if (value >= ((u64) 1 << obj_desc->common_field.bit_length)) { |
1da177e4 LT |
342 | /* |
343 | * The Value is larger than the maximum value that can fit into | |
344 | * the register. | |
345 | */ | |
46dfb09c BM |
346 | ACPI_ERROR((AE_INFO, |
347 | "Index value 0x%8.8X%8.8X overflows field width 0x%X", | |
348 | ACPI_FORMAT_UINT64(value), | |
349 | obj_desc->common_field.bit_length)); | |
350 | ||
1da177e4 LT |
351 | return (TRUE); |
352 | } | |
353 | ||
354 | /* The Value will fit into the field with no truncation */ | |
355 | ||
356 | return (FALSE); | |
357 | } | |
358 | ||
1da177e4 LT |
359 | /******************************************************************************* |
360 | * | |
361 | * FUNCTION: acpi_ex_field_datum_io | |
362 | * | |
44f6c012 | 363 | * PARAMETERS: obj_desc - Field to be read |
1da177e4 LT |
364 | * field_datum_byte_offset - Byte offset of this datum within the |
365 | * parent field | |
ba494bee | 366 | * value - Where to store value (must be 64 bits) |
1da177e4 LT |
367 | * read_write - Read or Write flag |
368 | * | |
369 | * RETURN: Status | |
370 | * | |
73a3090a | 371 | * DESCRIPTION: Read or Write a single datum of a field. The field_type is |
1da177e4 LT |
372 | * demultiplexed here to handle the different types of fields |
373 | * (buffer_field, region_field, index_field, bank_field) | |
374 | * | |
375 | ******************************************************************************/ | |
376 | ||
44f6c012 | 377 | static acpi_status |
4be44fcd | 378 | acpi_ex_field_datum_io(union acpi_operand_object *obj_desc, |
5df7e6cb | 379 | u32 field_datum_byte_offset, u64 *value, u32 read_write) |
1da177e4 | 380 | { |
4be44fcd | 381 | acpi_status status; |
5df7e6cb | 382 | u64 local_value; |
1da177e4 | 383 | |
b229cf92 | 384 | ACPI_FUNCTION_TRACE_U32(ex_field_datum_io, field_datum_byte_offset); |
1da177e4 LT |
385 | |
386 | if (read_write == ACPI_READ) { | |
387 | if (!value) { | |
388 | local_value = 0; | |
44f6c012 RM |
389 | |
390 | /* To support reads without saving return value */ | |
391 | value = &local_value; | |
1da177e4 LT |
392 | } |
393 | ||
394 | /* Clear the entire return buffer first, [Very Important!] */ | |
395 | ||
396 | *value = 0; | |
397 | } | |
398 | ||
399 | /* | |
400 | * The four types of fields are: | |
401 | * | |
402 | * buffer_field - Read/write from/to a Buffer | |
403 | * region_field - Read/write from/to a Operation Region. | |
44f6c012 RM |
404 | * bank_field - Write to a Bank Register, then read/write from/to an |
405 | * operation_region | |
406 | * index_field - Write to an Index Register, then read/write from/to a | |
407 | * Data Register | |
1da177e4 | 408 | */ |
3371c19c | 409 | switch (obj_desc->common.type) { |
1da177e4 LT |
410 | case ACPI_TYPE_BUFFER_FIELD: |
411 | /* | |
412 | * If the buffer_field arguments have not been previously evaluated, | |
413 | * evaluate them now and save the results. | |
414 | */ | |
415 | if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) { | |
4be44fcd LB |
416 | status = acpi_ds_get_buffer_field_arguments(obj_desc); |
417 | if (ACPI_FAILURE(status)) { | |
418 | return_ACPI_STATUS(status); | |
1da177e4 LT |
419 | } |
420 | } | |
421 | ||
422 | if (read_write == ACPI_READ) { | |
423 | /* | |
424 | * Copy the data from the source buffer. | |
425 | * Length is the field width in bytes. | |
426 | */ | |
4be44fcd LB |
427 | ACPI_MEMCPY(value, |
428 | (obj_desc->buffer_field.buffer_obj)->buffer. | |
429 | pointer + | |
430 | obj_desc->buffer_field.base_byte_offset + | |
431 | field_datum_byte_offset, | |
432 | obj_desc->common_field.access_byte_width); | |
433 | } else { | |
1da177e4 LT |
434 | /* |
435 | * Copy the data to the target buffer. | |
436 | * Length is the field width in bytes. | |
437 | */ | |
4be44fcd LB |
438 | ACPI_MEMCPY((obj_desc->buffer_field.buffer_obj)->buffer. |
439 | pointer + | |
440 | obj_desc->buffer_field.base_byte_offset + | |
441 | field_datum_byte_offset, value, | |
442 | obj_desc->common_field.access_byte_width); | |
1da177e4 LT |
443 | } |
444 | ||
445 | status = AE_OK; | |
446 | break; | |
447 | ||
1da177e4 | 448 | case ACPI_TYPE_LOCAL_BANK_FIELD: |
44f6c012 RM |
449 | /* |
450 | * Ensure that the bank_value is not beyond the capacity of | |
451 | * the register | |
452 | */ | |
4be44fcd | 453 | if (acpi_ex_register_overflow(obj_desc->bank_field.bank_obj, |
5df7e6cb BM |
454 | (u64) obj_desc->bank_field. |
455 | value)) { | |
4be44fcd | 456 | return_ACPI_STATUS(AE_AML_REGISTER_LIMIT); |
1da177e4 LT |
457 | } |
458 | ||
459 | /* | |
460 | * For bank_fields, we must write the bank_value to the bank_register | |
461 | * (itself a region_field) before we can access the data. | |
462 | */ | |
4be44fcd LB |
463 | status = |
464 | acpi_ex_insert_into_field(obj_desc->bank_field.bank_obj, | |
465 | &obj_desc->bank_field.value, | |
466 | sizeof(obj_desc->bank_field. | |
467 | value)); | |
468 | if (ACPI_FAILURE(status)) { | |
469 | return_ACPI_STATUS(status); | |
1da177e4 LT |
470 | } |
471 | ||
472 | /* | |
473 | * Now that the Bank has been selected, fall through to the | |
474 | * region_field case and write the datum to the Operation Region | |
475 | */ | |
476 | ||
477 | /*lint -fallthrough */ | |
478 | ||
1da177e4 LT |
479 | case ACPI_TYPE_LOCAL_REGION_FIELD: |
480 | /* | |
481 | * For simple region_fields, we just directly access the owning | |
482 | * Operation Region. | |
483 | */ | |
4be44fcd LB |
484 | status = |
485 | acpi_ex_access_region(obj_desc, field_datum_byte_offset, | |
486 | value, read_write); | |
1da177e4 LT |
487 | break; |
488 | ||
1da177e4 | 489 | case ACPI_TYPE_LOCAL_INDEX_FIELD: |
44f6c012 RM |
490 | /* |
491 | * Ensure that the index_value is not beyond the capacity of | |
492 | * the register | |
493 | */ | |
4be44fcd | 494 | if (acpi_ex_register_overflow(obj_desc->index_field.index_obj, |
5df7e6cb BM |
495 | (u64) obj_desc->index_field. |
496 | value)) { | |
4be44fcd | 497 | return_ACPI_STATUS(AE_AML_REGISTER_LIMIT); |
1da177e4 LT |
498 | } |
499 | ||
500 | /* Write the index value to the index_register (itself a region_field) */ | |
501 | ||
502 | field_datum_byte_offset += obj_desc->index_field.value; | |
503 | ||
4be44fcd LB |
504 | ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, |
505 | "Write to Index Register: Value %8.8X\n", | |
506 | field_datum_byte_offset)); | |
1da177e4 | 507 | |
4be44fcd LB |
508 | status = |
509 | acpi_ex_insert_into_field(obj_desc->index_field.index_obj, | |
510 | &field_datum_byte_offset, | |
511 | sizeof(field_datum_byte_offset)); | |
512 | if (ACPI_FAILURE(status)) { | |
513 | return_ACPI_STATUS(status); | |
1da177e4 LT |
514 | } |
515 | ||
1da177e4 | 516 | if (read_write == ACPI_READ) { |
52fc0b02 | 517 | |
1da177e4 LT |
518 | /* Read the datum from the data_register */ |
519 | ||
e9a8c6a9 BM |
520 | ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, |
521 | "Read from Data Register\n")); | |
522 | ||
4be44fcd LB |
523 | status = |
524 | acpi_ex_extract_from_field(obj_desc->index_field. | |
525 | data_obj, value, | |
5df7e6cb | 526 | sizeof(u64)); |
4be44fcd | 527 | } else { |
1da177e4 LT |
528 | /* Write the datum to the data_register */ |
529 | ||
e9a8c6a9 BM |
530 | ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, |
531 | "Write to Data Register: Value %8.8X%8.8X\n", | |
532 | ACPI_FORMAT_UINT64(*value))); | |
533 | ||
4be44fcd LB |
534 | status = |
535 | acpi_ex_insert_into_field(obj_desc->index_field. | |
536 | data_obj, value, | |
5df7e6cb | 537 | sizeof(u64)); |
1da177e4 LT |
538 | } |
539 | break; | |
540 | ||
1da177e4 LT |
541 | default: |
542 | ||
f6a22b0b | 543 | ACPI_ERROR((AE_INFO, "Wrong object type in field I/O %u", |
3371c19c | 544 | obj_desc->common.type)); |
1da177e4 LT |
545 | status = AE_AML_INTERNAL; |
546 | break; | |
547 | } | |
548 | ||
4be44fcd | 549 | if (ACPI_SUCCESS(status)) { |
1da177e4 | 550 | if (read_write == ACPI_READ) { |
4be44fcd | 551 | ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, |
b27d6597 | 552 | "Value Read %8.8X%8.8X, Width %u\n", |
4be44fcd LB |
553 | ACPI_FORMAT_UINT64(*value), |
554 | obj_desc->common_field. | |
555 | access_byte_width)); | |
556 | } else { | |
557 | ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, | |
b27d6597 | 558 | "Value Written %8.8X%8.8X, Width %u\n", |
4be44fcd LB |
559 | ACPI_FORMAT_UINT64(*value), |
560 | obj_desc->common_field. | |
561 | access_byte_width)); | |
1da177e4 LT |
562 | } |
563 | } | |
564 | ||
4be44fcd | 565 | return_ACPI_STATUS(status); |
1da177e4 LT |
566 | } |
567 | ||
1da177e4 LT |
568 | /******************************************************************************* |
569 | * | |
570 | * FUNCTION: acpi_ex_write_with_update_rule | |
571 | * | |
44f6c012 | 572 | * PARAMETERS: obj_desc - Field to be written |
ba494bee | 573 | * mask - bitmask within field datum |
44f6c012 RM |
574 | * field_value - Value to write |
575 | * field_datum_byte_offset - Offset of datum within field | |
1da177e4 LT |
576 | * |
577 | * RETURN: Status | |
578 | * | |
579 | * DESCRIPTION: Apply the field update rule to a field write | |
580 | * | |
581 | ******************************************************************************/ | |
582 | ||
583 | acpi_status | |
4be44fcd | 584 | acpi_ex_write_with_update_rule(union acpi_operand_object *obj_desc, |
5df7e6cb BM |
585 | u64 mask, |
586 | u64 field_value, u32 field_datum_byte_offset) | |
1da177e4 | 587 | { |
4be44fcd | 588 | acpi_status status = AE_OK; |
5df7e6cb BM |
589 | u64 merged_value; |
590 | u64 current_value; | |
1da177e4 | 591 | |
b229cf92 | 592 | ACPI_FUNCTION_TRACE_U32(ex_write_with_update_rule, mask); |
1da177e4 LT |
593 | |
594 | /* Start with the new bits */ | |
595 | ||
596 | merged_value = field_value; | |
597 | ||
598 | /* If the mask is all ones, we don't need to worry about the update rule */ | |
599 | ||
5df7e6cb | 600 | if (mask != ACPI_UINT64_MAX) { |
52fc0b02 | 601 | |
1da177e4 LT |
602 | /* Decode the update rule */ |
603 | ||
4be44fcd LB |
604 | switch (obj_desc->common_field. |
605 | field_flags & AML_FIELD_UPDATE_RULE_MASK) { | |
1da177e4 LT |
606 | case AML_FIELD_UPDATE_PRESERVE: |
607 | /* | |
608 | * Check if update rule needs to be applied (not if mask is all | |
609 | * ones) The left shift drops the bits we want to ignore. | |
610 | */ | |
4be44fcd LB |
611 | if ((~mask << (ACPI_MUL_8(sizeof(mask)) - |
612 | ACPI_MUL_8(obj_desc->common_field. | |
613 | access_byte_width))) != 0) { | |
1da177e4 LT |
614 | /* |
615 | * Read the current contents of the byte/word/dword containing | |
616 | * the field, and merge with the new field value. | |
617 | */ | |
4be44fcd LB |
618 | status = |
619 | acpi_ex_field_datum_io(obj_desc, | |
620 | field_datum_byte_offset, | |
621 | ¤t_value, | |
622 | ACPI_READ); | |
623 | if (ACPI_FAILURE(status)) { | |
624 | return_ACPI_STATUS(status); | |
1da177e4 LT |
625 | } |
626 | ||
627 | merged_value |= (current_value & ~mask); | |
628 | } | |
629 | break; | |
630 | ||
631 | case AML_FIELD_UPDATE_WRITE_AS_ONES: | |
632 | ||
633 | /* Set positions outside the field to all ones */ | |
634 | ||
635 | merged_value |= ~mask; | |
636 | break; | |
637 | ||
638 | case AML_FIELD_UPDATE_WRITE_AS_ZEROS: | |
639 | ||
640 | /* Set positions outside the field to all zeros */ | |
641 | ||
642 | merged_value &= mask; | |
643 | break; | |
644 | ||
645 | default: | |
646 | ||
b8e4d893 | 647 | ACPI_ERROR((AE_INFO, |
f6a22b0b | 648 | "Unknown UpdateRule value: 0x%X", |
b8e4d893 BM |
649 | (obj_desc->common_field. |
650 | field_flags & | |
651 | AML_FIELD_UPDATE_RULE_MASK))); | |
4be44fcd | 652 | return_ACPI_STATUS(AE_AML_OPERAND_VALUE); |
1da177e4 LT |
653 | } |
654 | } | |
655 | ||
4be44fcd | 656 | ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, |
b229cf92 | 657 | "Mask %8.8X%8.8X, DatumOffset %X, Width %X, Value %8.8X%8.8X, MergedValue %8.8X%8.8X\n", |
4be44fcd LB |
658 | ACPI_FORMAT_UINT64(mask), |
659 | field_datum_byte_offset, | |
660 | obj_desc->common_field.access_byte_width, | |
661 | ACPI_FORMAT_UINT64(field_value), | |
662 | ACPI_FORMAT_UINT64(merged_value))); | |
1da177e4 LT |
663 | |
664 | /* Write the merged value */ | |
665 | ||
4be44fcd LB |
666 | status = acpi_ex_field_datum_io(obj_desc, field_datum_byte_offset, |
667 | &merged_value, ACPI_WRITE); | |
1da177e4 | 668 | |
4be44fcd | 669 | return_ACPI_STATUS(status); |
1da177e4 LT |
670 | } |
671 | ||
1da177e4 LT |
672 | /******************************************************************************* |
673 | * | |
674 | * FUNCTION: acpi_ex_extract_from_field | |
675 | * | |
676 | * PARAMETERS: obj_desc - Field to be read | |
ba494bee | 677 | * buffer - Where to store the field data |
1da177e4 LT |
678 | * buffer_length - Length of Buffer |
679 | * | |
680 | * RETURN: Status | |
681 | * | |
682 | * DESCRIPTION: Retrieve the current value of the given field | |
683 | * | |
684 | ******************************************************************************/ | |
685 | ||
686 | acpi_status | |
4be44fcd LB |
687 | acpi_ex_extract_from_field(union acpi_operand_object *obj_desc, |
688 | void *buffer, u32 buffer_length) | |
1da177e4 | 689 | { |
4be44fcd | 690 | acpi_status status; |
5df7e6cb BM |
691 | u64 raw_datum; |
692 | u64 merged_datum; | |
4be44fcd LB |
693 | u32 field_offset = 0; |
694 | u32 buffer_offset = 0; | |
695 | u32 buffer_tail_bits; | |
696 | u32 datum_count; | |
697 | u32 field_datum_count; | |
09387b43 | 698 | u32 access_bit_width; |
4be44fcd LB |
699 | u32 i; |
700 | ||
b229cf92 | 701 | ACPI_FUNCTION_TRACE(ex_extract_from_field); |
1da177e4 LT |
702 | |
703 | /* Validate target buffer and clear it */ | |
704 | ||
4be44fcd LB |
705 | if (buffer_length < |
706 | ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->common_field.bit_length)) { | |
b8e4d893 | 707 | ACPI_ERROR((AE_INFO, |
f6a22b0b | 708 | "Field size %u (bits) is too large for buffer (%u)", |
b8e4d893 | 709 | obj_desc->common_field.bit_length, buffer_length)); |
1da177e4 | 710 | |
4be44fcd | 711 | return_ACPI_STATUS(AE_BUFFER_OVERFLOW); |
1da177e4 | 712 | } |
09387b43 | 713 | |
4be44fcd | 714 | ACPI_MEMSET(buffer, 0, buffer_length); |
09387b43 BM |
715 | access_bit_width = ACPI_MUL_8(obj_desc->common_field.access_byte_width); |
716 | ||
717 | /* Handle the simple case here */ | |
718 | ||
719 | if ((obj_desc->common_field.start_field_bit_offset == 0) && | |
720 | (obj_desc->common_field.bit_length == access_bit_width)) { | |
61388f9e BM |
721 | if (buffer_length >= sizeof(u64)) { |
722 | status = | |
723 | acpi_ex_field_datum_io(obj_desc, 0, buffer, | |
724 | ACPI_READ); | |
725 | } else { | |
726 | /* Use raw_datum (u64) to handle buffers < 64 bits */ | |
727 | ||
728 | status = | |
729 | acpi_ex_field_datum_io(obj_desc, 0, &raw_datum, | |
730 | ACPI_READ); | |
731 | ACPI_MEMCPY(buffer, &raw_datum, buffer_length); | |
732 | } | |
733 | ||
09387b43 BM |
734 | return_ACPI_STATUS(status); |
735 | } | |
736 | ||
737 | /* TBD: Move to common setup code */ | |
738 | ||
739 | /* Field algorithm is limited to sizeof(u64), truncate if needed */ | |
740 | ||
741 | if (obj_desc->common_field.access_byte_width > sizeof(u64)) { | |
742 | obj_desc->common_field.access_byte_width = sizeof(u64); | |
743 | access_bit_width = sizeof(u64) * 8; | |
744 | } | |
1da177e4 LT |
745 | |
746 | /* Compute the number of datums (access width data items) */ | |
747 | ||
09387b43 BM |
748 | datum_count = |
749 | ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length, | |
750 | access_bit_width); | |
751 | ||
4be44fcd LB |
752 | field_datum_count = ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length + |
753 | obj_desc->common_field. | |
754 | start_field_bit_offset, | |
4be44fcd | 755 | access_bit_width); |
1da177e4 LT |
756 | |
757 | /* Priming read from the field */ | |
758 | ||
4be44fcd LB |
759 | status = |
760 | acpi_ex_field_datum_io(obj_desc, field_offset, &raw_datum, | |
761 | ACPI_READ); | |
762 | if (ACPI_FAILURE(status)) { | |
763 | return_ACPI_STATUS(status); | |
1da177e4 | 764 | } |
4be44fcd LB |
765 | merged_datum = |
766 | raw_datum >> obj_desc->common_field.start_field_bit_offset; | |
1da177e4 LT |
767 | |
768 | /* Read the rest of the field */ | |
769 | ||
770 | for (i = 1; i < field_datum_count; i++) { | |
52fc0b02 | 771 | |
1da177e4 LT |
772 | /* Get next input datum from the field */ |
773 | ||
774 | field_offset += obj_desc->common_field.access_byte_width; | |
4be44fcd LB |
775 | status = acpi_ex_field_datum_io(obj_desc, field_offset, |
776 | &raw_datum, ACPI_READ); | |
777 | if (ACPI_FAILURE(status)) { | |
778 | return_ACPI_STATUS(status); | |
1da177e4 LT |
779 | } |
780 | ||
967440e3 BM |
781 | /* |
782 | * Merge with previous datum if necessary. | |
783 | * | |
784 | * Note: Before the shift, check if the shift value will be larger than | |
785 | * the integer size. If so, there is no need to perform the operation. | |
786 | * This avoids the differences in behavior between different compilers | |
787 | * concerning shift values larger than the target data width. | |
788 | */ | |
09387b43 BM |
789 | if (access_bit_width - |
790 | obj_desc->common_field.start_field_bit_offset < | |
967440e3 BM |
791 | ACPI_INTEGER_BIT_SIZE) { |
792 | merged_datum |= | |
09387b43 | 793 | raw_datum << (access_bit_width - |
967440e3 BM |
794 | obj_desc->common_field. |
795 | start_field_bit_offset); | |
796 | } | |
1da177e4 LT |
797 | |
798 | if (i == datum_count) { | |
799 | break; | |
800 | } | |
801 | ||
802 | /* Write merged datum to target buffer */ | |
803 | ||
4be44fcd LB |
804 | ACPI_MEMCPY(((char *)buffer) + buffer_offset, &merged_datum, |
805 | ACPI_MIN(obj_desc->common_field.access_byte_width, | |
806 | buffer_length - buffer_offset)); | |
1da177e4 LT |
807 | |
808 | buffer_offset += obj_desc->common_field.access_byte_width; | |
4be44fcd LB |
809 | merged_datum = |
810 | raw_datum >> obj_desc->common_field.start_field_bit_offset; | |
1da177e4 LT |
811 | } |
812 | ||
813 | /* Mask off any extra bits in the last datum */ | |
814 | ||
09387b43 | 815 | buffer_tail_bits = obj_desc->common_field.bit_length % access_bit_width; |
1da177e4 | 816 | if (buffer_tail_bits) { |
4be44fcd | 817 | merged_datum &= ACPI_MASK_BITS_ABOVE(buffer_tail_bits); |
1da177e4 LT |
818 | } |
819 | ||
820 | /* Write the last datum to the buffer */ | |
821 | ||
4be44fcd LB |
822 | ACPI_MEMCPY(((char *)buffer) + buffer_offset, &merged_datum, |
823 | ACPI_MIN(obj_desc->common_field.access_byte_width, | |
824 | buffer_length - buffer_offset)); | |
1da177e4 | 825 | |
4be44fcd | 826 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
827 | } |
828 | ||
1da177e4 LT |
829 | /******************************************************************************* |
830 | * | |
831 | * FUNCTION: acpi_ex_insert_into_field | |
832 | * | |
833 | * PARAMETERS: obj_desc - Field to be written | |
ba494bee | 834 | * buffer - Data to be written |
1da177e4 LT |
835 | * buffer_length - Length of Buffer |
836 | * | |
837 | * RETURN: Status | |
838 | * | |
839 | * DESCRIPTION: Store the Buffer contents into the given field | |
840 | * | |
841 | ******************************************************************************/ | |
842 | ||
843 | acpi_status | |
4be44fcd LB |
844 | acpi_ex_insert_into_field(union acpi_operand_object *obj_desc, |
845 | void *buffer, u32 buffer_length) | |
1da177e4 | 846 | { |
09387b43 | 847 | void *new_buffer; |
4be44fcd | 848 | acpi_status status; |
5df7e6cb BM |
849 | u64 mask; |
850 | u64 width_mask; | |
851 | u64 merged_datum; | |
852 | u64 raw_datum = 0; | |
4be44fcd LB |
853 | u32 field_offset = 0; |
854 | u32 buffer_offset = 0; | |
855 | u32 buffer_tail_bits; | |
856 | u32 datum_count; | |
857 | u32 field_datum_count; | |
09387b43 | 858 | u32 access_bit_width; |
9aa6169f | 859 | u32 required_length; |
09387b43 | 860 | u32 i; |
4be44fcd | 861 | |
b229cf92 | 862 | ACPI_FUNCTION_TRACE(ex_insert_into_field); |
1da177e4 LT |
863 | |
864 | /* Validate input buffer */ | |
865 | ||
9aa6169f BM |
866 | new_buffer = NULL; |
867 | required_length = | |
868 | ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->common_field.bit_length); | |
869 | /* | |
870 | * We must have a buffer that is at least as long as the field | |
73a3090a | 871 | * we are writing to. This is because individual fields are |
9aa6169f BM |
872 | * indivisible and partial writes are not supported -- as per |
873 | * the ACPI specification. | |
874 | */ | |
875 | if (buffer_length < required_length) { | |
1da177e4 | 876 | |
9aa6169f BM |
877 | /* We need to create a new buffer */ |
878 | ||
879 | new_buffer = ACPI_ALLOCATE_ZEROED(required_length); | |
880 | if (!new_buffer) { | |
881 | return_ACPI_STATUS(AE_NO_MEMORY); | |
882 | } | |
883 | ||
884 | /* | |
885 | * Copy the original data to the new buffer, starting | |
73a3090a | 886 | * at Byte zero. All unused (upper) bytes of the |
9aa6169f BM |
887 | * buffer will be 0. |
888 | */ | |
889 | ACPI_MEMCPY((char *)new_buffer, (char *)buffer, buffer_length); | |
890 | buffer = new_buffer; | |
891 | buffer_length = required_length; | |
1da177e4 LT |
892 | } |
893 | ||
09387b43 BM |
894 | /* TBD: Move to common setup code */ |
895 | ||
896 | /* Algo is limited to sizeof(u64), so cut the access_byte_width */ | |
897 | if (obj_desc->common_field.access_byte_width > sizeof(u64)) { | |
898 | obj_desc->common_field.access_byte_width = sizeof(u64); | |
899 | } | |
900 | ||
901 | access_bit_width = ACPI_MUL_8(obj_desc->common_field.access_byte_width); | |
902 | ||
967440e3 BM |
903 | /* |
904 | * Create the bitmasks used for bit insertion. | |
905 | * Note: This if/else is used to bypass compiler differences with the | |
906 | * shift operator | |
907 | */ | |
09387b43 | 908 | if (access_bit_width == ACPI_INTEGER_BIT_SIZE) { |
5df7e6cb | 909 | width_mask = ACPI_UINT64_MAX; |
967440e3 | 910 | } else { |
09387b43 | 911 | width_mask = ACPI_MASK_BITS_ABOVE(access_bit_width); |
967440e3 | 912 | } |
1da177e4 | 913 | |
967440e3 BM |
914 | mask = width_mask & |
915 | ACPI_MASK_BITS_BELOW(obj_desc->common_field.start_field_bit_offset); | |
916 | ||
917 | /* Compute the number of datums (access width data items) */ | |
4119532c BM |
918 | |
919 | datum_count = ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length, | |
09387b43 | 920 | access_bit_width); |
4119532c BM |
921 | |
922 | field_datum_count = ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length + | |
923 | obj_desc->common_field. | |
924 | start_field_bit_offset, | |
4119532c | 925 | access_bit_width); |
1da177e4 LT |
926 | |
927 | /* Get initial Datum from the input buffer */ | |
928 | ||
4be44fcd LB |
929 | ACPI_MEMCPY(&raw_datum, buffer, |
930 | ACPI_MIN(obj_desc->common_field.access_byte_width, | |
931 | buffer_length - buffer_offset)); | |
1da177e4 | 932 | |
4be44fcd LB |
933 | merged_datum = |
934 | raw_datum << obj_desc->common_field.start_field_bit_offset; | |
1da177e4 LT |
935 | |
936 | /* Write the entire field */ | |
937 | ||
938 | for (i = 1; i < field_datum_count; i++) { | |
52fc0b02 | 939 | |
1da177e4 LT |
940 | /* Write merged datum to the target field */ |
941 | ||
942 | merged_datum &= mask; | |
4be44fcd LB |
943 | status = acpi_ex_write_with_update_rule(obj_desc, mask, |
944 | merged_datum, | |
945 | field_offset); | |
946 | if (ACPI_FAILURE(status)) { | |
9aa6169f | 947 | goto exit; |
1da177e4 LT |
948 | } |
949 | ||
1da177e4 | 950 | field_offset += obj_desc->common_field.access_byte_width; |
967440e3 BM |
951 | |
952 | /* | |
953 | * Start new output datum by merging with previous input datum | |
954 | * if necessary. | |
955 | * | |
956 | * Note: Before the shift, check if the shift value will be larger than | |
957 | * the integer size. If so, there is no need to perform the operation. | |
958 | * This avoids the differences in behavior between different compilers | |
959 | * concerning shift values larger than the target data width. | |
960 | */ | |
09387b43 | 961 | if ((access_bit_width - |
967440e3 BM |
962 | obj_desc->common_field.start_field_bit_offset) < |
963 | ACPI_INTEGER_BIT_SIZE) { | |
964 | merged_datum = | |
09387b43 | 965 | raw_datum >> (access_bit_width - |
967440e3 BM |
966 | obj_desc->common_field. |
967 | start_field_bit_offset); | |
968 | } else { | |
969 | merged_datum = 0; | |
970 | } | |
971 | ||
4c90ece2 | 972 | mask = width_mask; |
1da177e4 LT |
973 | |
974 | if (i == datum_count) { | |
975 | break; | |
976 | } | |
977 | ||
978 | /* Get the next input datum from the buffer */ | |
979 | ||
980 | buffer_offset += obj_desc->common_field.access_byte_width; | |
4be44fcd LB |
981 | ACPI_MEMCPY(&raw_datum, ((char *)buffer) + buffer_offset, |
982 | ACPI_MIN(obj_desc->common_field.access_byte_width, | |
983 | buffer_length - buffer_offset)); | |
09387b43 | 984 | |
4be44fcd LB |
985 | merged_datum |= |
986 | raw_datum << obj_desc->common_field.start_field_bit_offset; | |
1da177e4 LT |
987 | } |
988 | ||
989 | /* Mask off any extra bits in the last datum */ | |
990 | ||
991 | buffer_tail_bits = (obj_desc->common_field.bit_length + | |
4be44fcd | 992 | obj_desc->common_field.start_field_bit_offset) % |
09387b43 | 993 | access_bit_width; |
1da177e4 | 994 | if (buffer_tail_bits) { |
4be44fcd | 995 | mask &= ACPI_MASK_BITS_ABOVE(buffer_tail_bits); |
1da177e4 LT |
996 | } |
997 | ||
998 | /* Write the last datum to the field */ | |
999 | ||
1000 | merged_datum &= mask; | |
4be44fcd LB |
1001 | status = acpi_ex_write_with_update_rule(obj_desc, |
1002 | mask, merged_datum, | |
1003 | field_offset); | |
1da177e4 | 1004 | |
9aa6169f BM |
1005 | exit: |
1006 | /* Free temporary buffer if we used one */ | |
1007 | ||
1008 | if (new_buffer) { | |
1009 | ACPI_FREE(new_buffer); | |
1010 | } | |
4be44fcd | 1011 | return_ACPI_STATUS(status); |
1da177e4 | 1012 | } |