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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, |
cc2080b0 | 266 | " Region [%s:%X], Width %X, ByteBase %X, Offset %X at %8.8X%8.8X\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, | |
cc2080b0 LZ |
272 | field_datum_byte_offset, |
273 | ACPI_FORMAT_UINT64(rgn_desc->region.address + | |
274 | region_offset))); | |
1da177e4 LT |
275 | |
276 | /* Invoke the appropriate address_space/op_region handler */ | |
277 | ||
9ce81784 BM |
278 | status = acpi_ev_address_space_dispatch(rgn_desc, obj_desc, |
279 | function, region_offset, | |
280 | ACPI_MUL_8(obj_desc-> | |
281 | common_field. | |
282 | access_byte_width), | |
283 | value); | |
1da177e4 | 284 | |
4be44fcd | 285 | if (ACPI_FAILURE(status)) { |
1da177e4 | 286 | if (status == AE_NOT_IMPLEMENTED) { |
b8e4d893 | 287 | ACPI_ERROR((AE_INFO, |
1b74dfb2 | 288 | "Region %s (ID=%u) not implemented", |
b8e4d893 BM |
289 | acpi_ut_get_region_name(rgn_desc->region. |
290 | space_id), | |
291 | rgn_desc->region.space_id)); | |
4be44fcd | 292 | } else if (status == AE_NOT_EXIST) { |
b8e4d893 | 293 | ACPI_ERROR((AE_INFO, |
1b74dfb2 | 294 | "Region %s (ID=%u) has no handler", |
b8e4d893 BM |
295 | acpi_ut_get_region_name(rgn_desc->region. |
296 | space_id), | |
297 | rgn_desc->region.space_id)); | |
1da177e4 LT |
298 | } |
299 | } | |
300 | ||
4be44fcd | 301 | return_ACPI_STATUS(status); |
1da177e4 LT |
302 | } |
303 | ||
1da177e4 LT |
304 | /******************************************************************************* |
305 | * | |
306 | * FUNCTION: acpi_ex_register_overflow | |
307 | * | |
44f6c012 | 308 | * PARAMETERS: obj_desc - Register(Field) to be written |
ba494bee | 309 | * value - Value to be stored |
1da177e4 LT |
310 | * |
311 | * RETURN: TRUE if value overflows the field, FALSE otherwise | |
312 | * | |
313 | * DESCRIPTION: Check if a value is out of range of the field being written. | |
314 | * Used to check if the values written to Index and Bank registers | |
73a3090a | 315 | * are out of range. Normally, the value is simply truncated |
1da177e4 LT |
316 | * to fit the field, but this case is most likely a serious |
317 | * coding error in the ASL. | |
318 | * | |
319 | ******************************************************************************/ | |
320 | ||
44f6c012 | 321 | static u8 |
5df7e6cb | 322 | acpi_ex_register_overflow(union acpi_operand_object *obj_desc, u64 value) |
1da177e4 LT |
323 | { |
324 | ||
325 | if (obj_desc->common_field.bit_length >= ACPI_INTEGER_BIT_SIZE) { | |
326 | /* | |
327 | * The field is large enough to hold the maximum integer, so we can | |
328 | * never overflow it. | |
329 | */ | |
330 | return (FALSE); | |
331 | } | |
332 | ||
5df7e6cb | 333 | if (value >= ((u64) 1 << obj_desc->common_field.bit_length)) { |
1da177e4 LT |
334 | /* |
335 | * The Value is larger than the maximum value that can fit into | |
336 | * the register. | |
337 | */ | |
46dfb09c BM |
338 | ACPI_ERROR((AE_INFO, |
339 | "Index value 0x%8.8X%8.8X overflows field width 0x%X", | |
340 | ACPI_FORMAT_UINT64(value), | |
341 | obj_desc->common_field.bit_length)); | |
342 | ||
1da177e4 LT |
343 | return (TRUE); |
344 | } | |
345 | ||
346 | /* The Value will fit into the field with no truncation */ | |
347 | ||
348 | return (FALSE); | |
349 | } | |
350 | ||
1da177e4 LT |
351 | /******************************************************************************* |
352 | * | |
353 | * FUNCTION: acpi_ex_field_datum_io | |
354 | * | |
44f6c012 | 355 | * PARAMETERS: obj_desc - Field to be read |
1da177e4 LT |
356 | * field_datum_byte_offset - Byte offset of this datum within the |
357 | * parent field | |
ba494bee | 358 | * value - Where to store value (must be 64 bits) |
1da177e4 LT |
359 | * read_write - Read or Write flag |
360 | * | |
361 | * RETURN: Status | |
362 | * | |
73a3090a | 363 | * DESCRIPTION: Read or Write a single datum of a field. The field_type is |
1da177e4 LT |
364 | * demultiplexed here to handle the different types of fields |
365 | * (buffer_field, region_field, index_field, bank_field) | |
366 | * | |
367 | ******************************************************************************/ | |
368 | ||
44f6c012 | 369 | static acpi_status |
4be44fcd | 370 | acpi_ex_field_datum_io(union acpi_operand_object *obj_desc, |
5df7e6cb | 371 | u32 field_datum_byte_offset, u64 *value, u32 read_write) |
1da177e4 | 372 | { |
4be44fcd | 373 | acpi_status status; |
5df7e6cb | 374 | u64 local_value; |
1da177e4 | 375 | |
b229cf92 | 376 | ACPI_FUNCTION_TRACE_U32(ex_field_datum_io, field_datum_byte_offset); |
1da177e4 LT |
377 | |
378 | if (read_write == ACPI_READ) { | |
379 | if (!value) { | |
380 | local_value = 0; | |
44f6c012 RM |
381 | |
382 | /* To support reads without saving return value */ | |
383 | value = &local_value; | |
1da177e4 LT |
384 | } |
385 | ||
386 | /* Clear the entire return buffer first, [Very Important!] */ | |
387 | ||
388 | *value = 0; | |
389 | } | |
390 | ||
391 | /* | |
392 | * The four types of fields are: | |
393 | * | |
394 | * buffer_field - Read/write from/to a Buffer | |
395 | * region_field - Read/write from/to a Operation Region. | |
44f6c012 RM |
396 | * bank_field - Write to a Bank Register, then read/write from/to an |
397 | * operation_region | |
398 | * index_field - Write to an Index Register, then read/write from/to a | |
399 | * Data Register | |
1da177e4 | 400 | */ |
3371c19c | 401 | switch (obj_desc->common.type) { |
1da177e4 LT |
402 | case ACPI_TYPE_BUFFER_FIELD: |
403 | /* | |
404 | * If the buffer_field arguments have not been previously evaluated, | |
405 | * evaluate them now and save the results. | |
406 | */ | |
407 | if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) { | |
4be44fcd LB |
408 | status = acpi_ds_get_buffer_field_arguments(obj_desc); |
409 | if (ACPI_FAILURE(status)) { | |
410 | return_ACPI_STATUS(status); | |
1da177e4 LT |
411 | } |
412 | } | |
413 | ||
414 | if (read_write == ACPI_READ) { | |
415 | /* | |
416 | * Copy the data from the source buffer. | |
417 | * Length is the field width in bytes. | |
418 | */ | |
4fa4616e BM |
419 | memcpy(value, |
420 | (obj_desc->buffer_field.buffer_obj)->buffer. | |
421 | pointer + | |
422 | obj_desc->buffer_field.base_byte_offset + | |
423 | field_datum_byte_offset, | |
424 | obj_desc->common_field.access_byte_width); | |
4be44fcd | 425 | } else { |
1da177e4 LT |
426 | /* |
427 | * Copy the data to the target buffer. | |
428 | * Length is the field width in bytes. | |
429 | */ | |
4fa4616e BM |
430 | memcpy((obj_desc->buffer_field.buffer_obj)->buffer. |
431 | pointer + | |
432 | obj_desc->buffer_field.base_byte_offset + | |
433 | field_datum_byte_offset, value, | |
434 | obj_desc->common_field.access_byte_width); | |
1da177e4 LT |
435 | } |
436 | ||
437 | status = AE_OK; | |
438 | break; | |
439 | ||
1da177e4 | 440 | case ACPI_TYPE_LOCAL_BANK_FIELD: |
44f6c012 RM |
441 | /* |
442 | * Ensure that the bank_value is not beyond the capacity of | |
443 | * the register | |
444 | */ | |
4be44fcd | 445 | if (acpi_ex_register_overflow(obj_desc->bank_field.bank_obj, |
5df7e6cb BM |
446 | (u64) obj_desc->bank_field. |
447 | value)) { | |
4be44fcd | 448 | return_ACPI_STATUS(AE_AML_REGISTER_LIMIT); |
1da177e4 LT |
449 | } |
450 | ||
451 | /* | |
452 | * For bank_fields, we must write the bank_value to the bank_register | |
453 | * (itself a region_field) before we can access the data. | |
454 | */ | |
4be44fcd LB |
455 | status = |
456 | acpi_ex_insert_into_field(obj_desc->bank_field.bank_obj, | |
457 | &obj_desc->bank_field.value, | |
458 | sizeof(obj_desc->bank_field. | |
459 | value)); | |
460 | if (ACPI_FAILURE(status)) { | |
461 | return_ACPI_STATUS(status); | |
1da177e4 LT |
462 | } |
463 | ||
464 | /* | |
465 | * Now that the Bank has been selected, fall through to the | |
466 | * region_field case and write the datum to the Operation Region | |
467 | */ | |
468 | ||
469 | /*lint -fallthrough */ | |
470 | ||
1da177e4 LT |
471 | case ACPI_TYPE_LOCAL_REGION_FIELD: |
472 | /* | |
473 | * For simple region_fields, we just directly access the owning | |
474 | * Operation Region. | |
475 | */ | |
4be44fcd LB |
476 | status = |
477 | acpi_ex_access_region(obj_desc, field_datum_byte_offset, | |
478 | value, read_write); | |
1da177e4 LT |
479 | break; |
480 | ||
1da177e4 | 481 | case ACPI_TYPE_LOCAL_INDEX_FIELD: |
44f6c012 RM |
482 | /* |
483 | * Ensure that the index_value is not beyond the capacity of | |
484 | * the register | |
485 | */ | |
4be44fcd | 486 | if (acpi_ex_register_overflow(obj_desc->index_field.index_obj, |
5df7e6cb BM |
487 | (u64) obj_desc->index_field. |
488 | value)) { | |
4be44fcd | 489 | return_ACPI_STATUS(AE_AML_REGISTER_LIMIT); |
1da177e4 LT |
490 | } |
491 | ||
492 | /* Write the index value to the index_register (itself a region_field) */ | |
493 | ||
494 | field_datum_byte_offset += obj_desc->index_field.value; | |
495 | ||
4be44fcd LB |
496 | ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, |
497 | "Write to Index Register: Value %8.8X\n", | |
498 | field_datum_byte_offset)); | |
1da177e4 | 499 | |
4be44fcd LB |
500 | status = |
501 | acpi_ex_insert_into_field(obj_desc->index_field.index_obj, | |
502 | &field_datum_byte_offset, | |
503 | sizeof(field_datum_byte_offset)); | |
504 | if (ACPI_FAILURE(status)) { | |
505 | return_ACPI_STATUS(status); | |
1da177e4 LT |
506 | } |
507 | ||
1da177e4 | 508 | if (read_write == ACPI_READ) { |
52fc0b02 | 509 | |
1da177e4 LT |
510 | /* Read the datum from the data_register */ |
511 | ||
e9a8c6a9 BM |
512 | ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, |
513 | "Read from Data Register\n")); | |
514 | ||
4be44fcd LB |
515 | status = |
516 | acpi_ex_extract_from_field(obj_desc->index_field. | |
517 | data_obj, value, | |
5df7e6cb | 518 | sizeof(u64)); |
4be44fcd | 519 | } else { |
1da177e4 LT |
520 | /* Write the datum to the data_register */ |
521 | ||
e9a8c6a9 BM |
522 | ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, |
523 | "Write to Data Register: Value %8.8X%8.8X\n", | |
524 | ACPI_FORMAT_UINT64(*value))); | |
525 | ||
4be44fcd LB |
526 | status = |
527 | acpi_ex_insert_into_field(obj_desc->index_field. | |
528 | data_obj, value, | |
5df7e6cb | 529 | sizeof(u64)); |
1da177e4 LT |
530 | } |
531 | break; | |
532 | ||
1da177e4 LT |
533 | default: |
534 | ||
f6a22b0b | 535 | ACPI_ERROR((AE_INFO, "Wrong object type in field I/O %u", |
3371c19c | 536 | obj_desc->common.type)); |
1da177e4 LT |
537 | status = AE_AML_INTERNAL; |
538 | break; | |
539 | } | |
540 | ||
4be44fcd | 541 | if (ACPI_SUCCESS(status)) { |
1da177e4 | 542 | if (read_write == ACPI_READ) { |
4be44fcd | 543 | ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, |
b27d6597 | 544 | "Value Read %8.8X%8.8X, Width %u\n", |
4be44fcd LB |
545 | ACPI_FORMAT_UINT64(*value), |
546 | obj_desc->common_field. | |
547 | access_byte_width)); | |
548 | } else { | |
549 | ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, | |
b27d6597 | 550 | "Value Written %8.8X%8.8X, Width %u\n", |
4be44fcd LB |
551 | ACPI_FORMAT_UINT64(*value), |
552 | obj_desc->common_field. | |
553 | access_byte_width)); | |
1da177e4 LT |
554 | } |
555 | } | |
556 | ||
4be44fcd | 557 | return_ACPI_STATUS(status); |
1da177e4 LT |
558 | } |
559 | ||
1da177e4 LT |
560 | /******************************************************************************* |
561 | * | |
562 | * FUNCTION: acpi_ex_write_with_update_rule | |
563 | * | |
44f6c012 | 564 | * PARAMETERS: obj_desc - Field to be written |
ba494bee | 565 | * mask - bitmask within field datum |
44f6c012 RM |
566 | * field_value - Value to write |
567 | * field_datum_byte_offset - Offset of datum within field | |
1da177e4 LT |
568 | * |
569 | * RETURN: Status | |
570 | * | |
571 | * DESCRIPTION: Apply the field update rule to a field write | |
572 | * | |
573 | ******************************************************************************/ | |
574 | ||
575 | acpi_status | |
4be44fcd | 576 | acpi_ex_write_with_update_rule(union acpi_operand_object *obj_desc, |
5df7e6cb BM |
577 | u64 mask, |
578 | u64 field_value, u32 field_datum_byte_offset) | |
1da177e4 | 579 | { |
4be44fcd | 580 | acpi_status status = AE_OK; |
5df7e6cb BM |
581 | u64 merged_value; |
582 | u64 current_value; | |
1da177e4 | 583 | |
b229cf92 | 584 | ACPI_FUNCTION_TRACE_U32(ex_write_with_update_rule, mask); |
1da177e4 LT |
585 | |
586 | /* Start with the new bits */ | |
587 | ||
588 | merged_value = field_value; | |
589 | ||
590 | /* If the mask is all ones, we don't need to worry about the update rule */ | |
591 | ||
5df7e6cb | 592 | if (mask != ACPI_UINT64_MAX) { |
52fc0b02 | 593 | |
1da177e4 LT |
594 | /* Decode the update rule */ |
595 | ||
4be44fcd LB |
596 | switch (obj_desc->common_field. |
597 | field_flags & AML_FIELD_UPDATE_RULE_MASK) { | |
1da177e4 LT |
598 | case AML_FIELD_UPDATE_PRESERVE: |
599 | /* | |
600 | * Check if update rule needs to be applied (not if mask is all | |
601 | * ones) The left shift drops the bits we want to ignore. | |
602 | */ | |
4be44fcd LB |
603 | if ((~mask << (ACPI_MUL_8(sizeof(mask)) - |
604 | ACPI_MUL_8(obj_desc->common_field. | |
605 | access_byte_width))) != 0) { | |
1da177e4 LT |
606 | /* |
607 | * Read the current contents of the byte/word/dword containing | |
608 | * the field, and merge with the new field value. | |
609 | */ | |
4be44fcd LB |
610 | status = |
611 | acpi_ex_field_datum_io(obj_desc, | |
612 | field_datum_byte_offset, | |
613 | ¤t_value, | |
614 | ACPI_READ); | |
615 | if (ACPI_FAILURE(status)) { | |
616 | return_ACPI_STATUS(status); | |
1da177e4 LT |
617 | } |
618 | ||
619 | merged_value |= (current_value & ~mask); | |
620 | } | |
621 | break; | |
622 | ||
623 | case AML_FIELD_UPDATE_WRITE_AS_ONES: | |
624 | ||
625 | /* Set positions outside the field to all ones */ | |
626 | ||
627 | merged_value |= ~mask; | |
628 | break; | |
629 | ||
630 | case AML_FIELD_UPDATE_WRITE_AS_ZEROS: | |
631 | ||
632 | /* Set positions outside the field to all zeros */ | |
633 | ||
634 | merged_value &= mask; | |
635 | break; | |
636 | ||
637 | default: | |
638 | ||
b8e4d893 | 639 | ACPI_ERROR((AE_INFO, |
f6a22b0b | 640 | "Unknown UpdateRule value: 0x%X", |
b8e4d893 BM |
641 | (obj_desc->common_field. |
642 | field_flags & | |
643 | AML_FIELD_UPDATE_RULE_MASK))); | |
4be44fcd | 644 | return_ACPI_STATUS(AE_AML_OPERAND_VALUE); |
1da177e4 LT |
645 | } |
646 | } | |
647 | ||
4be44fcd | 648 | ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, |
b229cf92 | 649 | "Mask %8.8X%8.8X, DatumOffset %X, Width %X, Value %8.8X%8.8X, MergedValue %8.8X%8.8X\n", |
4be44fcd LB |
650 | ACPI_FORMAT_UINT64(mask), |
651 | field_datum_byte_offset, | |
652 | obj_desc->common_field.access_byte_width, | |
653 | ACPI_FORMAT_UINT64(field_value), | |
654 | ACPI_FORMAT_UINT64(merged_value))); | |
1da177e4 LT |
655 | |
656 | /* Write the merged value */ | |
657 | ||
4be44fcd LB |
658 | status = acpi_ex_field_datum_io(obj_desc, field_datum_byte_offset, |
659 | &merged_value, ACPI_WRITE); | |
1da177e4 | 660 | |
4be44fcd | 661 | return_ACPI_STATUS(status); |
1da177e4 LT |
662 | } |
663 | ||
1da177e4 LT |
664 | /******************************************************************************* |
665 | * | |
666 | * FUNCTION: acpi_ex_extract_from_field | |
667 | * | |
668 | * PARAMETERS: obj_desc - Field to be read | |
ba494bee | 669 | * buffer - Where to store the field data |
1da177e4 LT |
670 | * buffer_length - Length of Buffer |
671 | * | |
672 | * RETURN: Status | |
673 | * | |
674 | * DESCRIPTION: Retrieve the current value of the given field | |
675 | * | |
676 | ******************************************************************************/ | |
677 | ||
678 | acpi_status | |
4be44fcd LB |
679 | acpi_ex_extract_from_field(union acpi_operand_object *obj_desc, |
680 | void *buffer, u32 buffer_length) | |
1da177e4 | 681 | { |
4be44fcd | 682 | acpi_status status; |
5df7e6cb BM |
683 | u64 raw_datum; |
684 | u64 merged_datum; | |
4be44fcd LB |
685 | u32 field_offset = 0; |
686 | u32 buffer_offset = 0; | |
687 | u32 buffer_tail_bits; | |
688 | u32 datum_count; | |
689 | u32 field_datum_count; | |
09387b43 | 690 | u32 access_bit_width; |
4be44fcd LB |
691 | u32 i; |
692 | ||
b229cf92 | 693 | ACPI_FUNCTION_TRACE(ex_extract_from_field); |
1da177e4 LT |
694 | |
695 | /* Validate target buffer and clear it */ | |
696 | ||
4be44fcd LB |
697 | if (buffer_length < |
698 | ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->common_field.bit_length)) { | |
b8e4d893 | 699 | ACPI_ERROR((AE_INFO, |
f6a22b0b | 700 | "Field size %u (bits) is too large for buffer (%u)", |
b8e4d893 | 701 | obj_desc->common_field.bit_length, buffer_length)); |
1da177e4 | 702 | |
4be44fcd | 703 | return_ACPI_STATUS(AE_BUFFER_OVERFLOW); |
1da177e4 | 704 | } |
09387b43 | 705 | |
4fa4616e | 706 | memset(buffer, 0, buffer_length); |
09387b43 BM |
707 | access_bit_width = ACPI_MUL_8(obj_desc->common_field.access_byte_width); |
708 | ||
709 | /* Handle the simple case here */ | |
710 | ||
711 | if ((obj_desc->common_field.start_field_bit_offset == 0) && | |
712 | (obj_desc->common_field.bit_length == access_bit_width)) { | |
61388f9e BM |
713 | if (buffer_length >= sizeof(u64)) { |
714 | status = | |
715 | acpi_ex_field_datum_io(obj_desc, 0, buffer, | |
716 | ACPI_READ); | |
717 | } else { | |
718 | /* Use raw_datum (u64) to handle buffers < 64 bits */ | |
719 | ||
720 | status = | |
721 | acpi_ex_field_datum_io(obj_desc, 0, &raw_datum, | |
722 | ACPI_READ); | |
4fa4616e | 723 | memcpy(buffer, &raw_datum, buffer_length); |
61388f9e BM |
724 | } |
725 | ||
09387b43 BM |
726 | return_ACPI_STATUS(status); |
727 | } | |
728 | ||
729 | /* TBD: Move to common setup code */ | |
730 | ||
731 | /* Field algorithm is limited to sizeof(u64), truncate if needed */ | |
732 | ||
733 | if (obj_desc->common_field.access_byte_width > sizeof(u64)) { | |
734 | obj_desc->common_field.access_byte_width = sizeof(u64); | |
735 | access_bit_width = sizeof(u64) * 8; | |
736 | } | |
1da177e4 LT |
737 | |
738 | /* Compute the number of datums (access width data items) */ | |
739 | ||
09387b43 BM |
740 | datum_count = |
741 | ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length, | |
742 | access_bit_width); | |
743 | ||
4be44fcd LB |
744 | field_datum_count = ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length + |
745 | obj_desc->common_field. | |
746 | start_field_bit_offset, | |
4be44fcd | 747 | access_bit_width); |
1da177e4 LT |
748 | |
749 | /* Priming read from the field */ | |
750 | ||
4be44fcd LB |
751 | status = |
752 | acpi_ex_field_datum_io(obj_desc, field_offset, &raw_datum, | |
753 | ACPI_READ); | |
754 | if (ACPI_FAILURE(status)) { | |
755 | return_ACPI_STATUS(status); | |
1da177e4 | 756 | } |
4be44fcd LB |
757 | merged_datum = |
758 | raw_datum >> obj_desc->common_field.start_field_bit_offset; | |
1da177e4 LT |
759 | |
760 | /* Read the rest of the field */ | |
761 | ||
762 | for (i = 1; i < field_datum_count; i++) { | |
52fc0b02 | 763 | |
1da177e4 LT |
764 | /* Get next input datum from the field */ |
765 | ||
766 | field_offset += obj_desc->common_field.access_byte_width; | |
4be44fcd LB |
767 | status = acpi_ex_field_datum_io(obj_desc, field_offset, |
768 | &raw_datum, ACPI_READ); | |
769 | if (ACPI_FAILURE(status)) { | |
770 | return_ACPI_STATUS(status); | |
1da177e4 LT |
771 | } |
772 | ||
967440e3 BM |
773 | /* |
774 | * Merge with previous datum if necessary. | |
775 | * | |
776 | * Note: Before the shift, check if the shift value will be larger than | |
777 | * the integer size. If so, there is no need to perform the operation. | |
778 | * This avoids the differences in behavior between different compilers | |
779 | * concerning shift values larger than the target data width. | |
780 | */ | |
09387b43 BM |
781 | if (access_bit_width - |
782 | obj_desc->common_field.start_field_bit_offset < | |
967440e3 BM |
783 | ACPI_INTEGER_BIT_SIZE) { |
784 | merged_datum |= | |
09387b43 | 785 | raw_datum << (access_bit_width - |
967440e3 BM |
786 | obj_desc->common_field. |
787 | start_field_bit_offset); | |
788 | } | |
1da177e4 LT |
789 | |
790 | if (i == datum_count) { | |
791 | break; | |
792 | } | |
793 | ||
794 | /* Write merged datum to target buffer */ | |
795 | ||
4fa4616e BM |
796 | memcpy(((char *)buffer) + buffer_offset, &merged_datum, |
797 | ACPI_MIN(obj_desc->common_field.access_byte_width, | |
798 | buffer_length - buffer_offset)); | |
1da177e4 LT |
799 | |
800 | buffer_offset += obj_desc->common_field.access_byte_width; | |
4be44fcd LB |
801 | merged_datum = |
802 | raw_datum >> obj_desc->common_field.start_field_bit_offset; | |
1da177e4 LT |
803 | } |
804 | ||
805 | /* Mask off any extra bits in the last datum */ | |
806 | ||
09387b43 | 807 | buffer_tail_bits = obj_desc->common_field.bit_length % access_bit_width; |
1da177e4 | 808 | if (buffer_tail_bits) { |
4be44fcd | 809 | merged_datum &= ACPI_MASK_BITS_ABOVE(buffer_tail_bits); |
1da177e4 LT |
810 | } |
811 | ||
812 | /* Write the last datum to the buffer */ | |
813 | ||
4fa4616e BM |
814 | memcpy(((char *)buffer) + buffer_offset, &merged_datum, |
815 | ACPI_MIN(obj_desc->common_field.access_byte_width, | |
816 | buffer_length - buffer_offset)); | |
1da177e4 | 817 | |
4be44fcd | 818 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
819 | } |
820 | ||
1da177e4 LT |
821 | /******************************************************************************* |
822 | * | |
823 | * FUNCTION: acpi_ex_insert_into_field | |
824 | * | |
825 | * PARAMETERS: obj_desc - Field to be written | |
ba494bee | 826 | * buffer - Data to be written |
1da177e4 LT |
827 | * buffer_length - Length of Buffer |
828 | * | |
829 | * RETURN: Status | |
830 | * | |
831 | * DESCRIPTION: Store the Buffer contents into the given field | |
832 | * | |
833 | ******************************************************************************/ | |
834 | ||
835 | acpi_status | |
4be44fcd LB |
836 | acpi_ex_insert_into_field(union acpi_operand_object *obj_desc, |
837 | void *buffer, u32 buffer_length) | |
1da177e4 | 838 | { |
09387b43 | 839 | void *new_buffer; |
4be44fcd | 840 | acpi_status status; |
5df7e6cb BM |
841 | u64 mask; |
842 | u64 width_mask; | |
843 | u64 merged_datum; | |
844 | u64 raw_datum = 0; | |
4be44fcd LB |
845 | u32 field_offset = 0; |
846 | u32 buffer_offset = 0; | |
847 | u32 buffer_tail_bits; | |
848 | u32 datum_count; | |
849 | u32 field_datum_count; | |
09387b43 | 850 | u32 access_bit_width; |
9aa6169f | 851 | u32 required_length; |
09387b43 | 852 | u32 i; |
4be44fcd | 853 | |
b229cf92 | 854 | ACPI_FUNCTION_TRACE(ex_insert_into_field); |
1da177e4 LT |
855 | |
856 | /* Validate input buffer */ | |
857 | ||
9aa6169f BM |
858 | new_buffer = NULL; |
859 | required_length = | |
860 | ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->common_field.bit_length); | |
861 | /* | |
862 | * We must have a buffer that is at least as long as the field | |
73a3090a | 863 | * we are writing to. This is because individual fields are |
9aa6169f BM |
864 | * indivisible and partial writes are not supported -- as per |
865 | * the ACPI specification. | |
866 | */ | |
867 | if (buffer_length < required_length) { | |
1da177e4 | 868 | |
9aa6169f BM |
869 | /* We need to create a new buffer */ |
870 | ||
871 | new_buffer = ACPI_ALLOCATE_ZEROED(required_length); | |
872 | if (!new_buffer) { | |
873 | return_ACPI_STATUS(AE_NO_MEMORY); | |
874 | } | |
875 | ||
876 | /* | |
877 | * Copy the original data to the new buffer, starting | |
73a3090a | 878 | * at Byte zero. All unused (upper) bytes of the |
9aa6169f BM |
879 | * buffer will be 0. |
880 | */ | |
4fa4616e | 881 | memcpy((char *)new_buffer, (char *)buffer, buffer_length); |
9aa6169f BM |
882 | buffer = new_buffer; |
883 | buffer_length = required_length; | |
1da177e4 LT |
884 | } |
885 | ||
09387b43 BM |
886 | /* TBD: Move to common setup code */ |
887 | ||
888 | /* Algo is limited to sizeof(u64), so cut the access_byte_width */ | |
889 | if (obj_desc->common_field.access_byte_width > sizeof(u64)) { | |
890 | obj_desc->common_field.access_byte_width = sizeof(u64); | |
891 | } | |
892 | ||
893 | access_bit_width = ACPI_MUL_8(obj_desc->common_field.access_byte_width); | |
894 | ||
967440e3 BM |
895 | /* |
896 | * Create the bitmasks used for bit insertion. | |
897 | * Note: This if/else is used to bypass compiler differences with the | |
898 | * shift operator | |
899 | */ | |
09387b43 | 900 | if (access_bit_width == ACPI_INTEGER_BIT_SIZE) { |
5df7e6cb | 901 | width_mask = ACPI_UINT64_MAX; |
967440e3 | 902 | } else { |
09387b43 | 903 | width_mask = ACPI_MASK_BITS_ABOVE(access_bit_width); |
967440e3 | 904 | } |
1da177e4 | 905 | |
967440e3 BM |
906 | mask = width_mask & |
907 | ACPI_MASK_BITS_BELOW(obj_desc->common_field.start_field_bit_offset); | |
908 | ||
909 | /* Compute the number of datums (access width data items) */ | |
4119532c BM |
910 | |
911 | datum_count = ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length, | |
09387b43 | 912 | access_bit_width); |
4119532c BM |
913 | |
914 | field_datum_count = ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length + | |
915 | obj_desc->common_field. | |
916 | start_field_bit_offset, | |
4119532c | 917 | access_bit_width); |
1da177e4 LT |
918 | |
919 | /* Get initial Datum from the input buffer */ | |
920 | ||
4fa4616e BM |
921 | memcpy(&raw_datum, buffer, |
922 | ACPI_MIN(obj_desc->common_field.access_byte_width, | |
923 | buffer_length - buffer_offset)); | |
1da177e4 | 924 | |
4be44fcd LB |
925 | merged_datum = |
926 | raw_datum << obj_desc->common_field.start_field_bit_offset; | |
1da177e4 LT |
927 | |
928 | /* Write the entire field */ | |
929 | ||
930 | for (i = 1; i < field_datum_count; i++) { | |
52fc0b02 | 931 | |
1da177e4 LT |
932 | /* Write merged datum to the target field */ |
933 | ||
934 | merged_datum &= mask; | |
4be44fcd LB |
935 | status = acpi_ex_write_with_update_rule(obj_desc, mask, |
936 | merged_datum, | |
937 | field_offset); | |
938 | if (ACPI_FAILURE(status)) { | |
9aa6169f | 939 | goto exit; |
1da177e4 LT |
940 | } |
941 | ||
1da177e4 | 942 | field_offset += obj_desc->common_field.access_byte_width; |
967440e3 BM |
943 | |
944 | /* | |
945 | * Start new output datum by merging with previous input datum | |
946 | * if necessary. | |
947 | * | |
948 | * Note: Before the shift, check if the shift value will be larger than | |
949 | * the integer size. If so, there is no need to perform the operation. | |
950 | * This avoids the differences in behavior between different compilers | |
951 | * concerning shift values larger than the target data width. | |
952 | */ | |
09387b43 | 953 | if ((access_bit_width - |
967440e3 BM |
954 | obj_desc->common_field.start_field_bit_offset) < |
955 | ACPI_INTEGER_BIT_SIZE) { | |
956 | merged_datum = | |
09387b43 | 957 | raw_datum >> (access_bit_width - |
967440e3 BM |
958 | obj_desc->common_field. |
959 | start_field_bit_offset); | |
960 | } else { | |
961 | merged_datum = 0; | |
962 | } | |
963 | ||
4c90ece2 | 964 | mask = width_mask; |
1da177e4 LT |
965 | |
966 | if (i == datum_count) { | |
967 | break; | |
968 | } | |
969 | ||
970 | /* Get the next input datum from the buffer */ | |
971 | ||
972 | buffer_offset += obj_desc->common_field.access_byte_width; | |
4fa4616e BM |
973 | memcpy(&raw_datum, ((char *)buffer) + buffer_offset, |
974 | ACPI_MIN(obj_desc->common_field.access_byte_width, | |
975 | buffer_length - buffer_offset)); | |
09387b43 | 976 | |
4be44fcd LB |
977 | merged_datum |= |
978 | raw_datum << obj_desc->common_field.start_field_bit_offset; | |
1da177e4 LT |
979 | } |
980 | ||
981 | /* Mask off any extra bits in the last datum */ | |
982 | ||
983 | buffer_tail_bits = (obj_desc->common_field.bit_length + | |
4be44fcd | 984 | obj_desc->common_field.start_field_bit_offset) % |
09387b43 | 985 | access_bit_width; |
1da177e4 | 986 | if (buffer_tail_bits) { |
4be44fcd | 987 | mask &= ACPI_MASK_BITS_ABOVE(buffer_tail_bits); |
1da177e4 LT |
988 | } |
989 | ||
990 | /* Write the last datum to the field */ | |
991 | ||
992 | merged_datum &= mask; | |
4be44fcd LB |
993 | status = acpi_ex_write_with_update_rule(obj_desc, |
994 | mask, merged_datum, | |
995 | field_offset); | |
1da177e4 | 996 | |
10622bf8 | 997 | exit: |
9aa6169f BM |
998 | /* Free temporary buffer if we used one */ |
999 | ||
1000 | if (new_buffer) { | |
1001 | ACPI_FREE(new_buffer); | |
1002 | } | |
4be44fcd | 1003 | return_ACPI_STATUS(status); |
1da177e4 | 1004 | } |