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1/******************************************************************************
2 *
3 * Module Name: exfield - ACPI AML (p-code) execution - field manipulation
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2012, Intel Corp.
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
44#include <acpi/acpi.h>
45#include "accommon.h"
46#include "acdispat.h"
47#include "acinterp.h"
48
49#define _COMPONENT ACPI_EXECUTER
50ACPI_MODULE_NAME("exfield")
51
52/*******************************************************************************
53 *
54 * FUNCTION: acpi_ex_read_data_from_field
55 *
56 * PARAMETERS: walk_state - Current execution state
57 * obj_desc - The named field
58 * ret_buffer_desc - Where the return data object is stored
59 *
60 * RETURN: Status
61 *
62 * DESCRIPTION: Read from a named field. Returns either an Integer or a
63 * Buffer, depending on the size of the field.
64 *
65 ******************************************************************************/
66acpi_status
67acpi_ex_read_data_from_field(struct acpi_walk_state *walk_state,
68 union acpi_operand_object *obj_desc,
69 union acpi_operand_object **ret_buffer_desc)
70{
71 acpi_status status;
72 union acpi_operand_object *buffer_desc;
73 acpi_size length;
74 void *buffer;
75 u32 function;
76
77 ACPI_FUNCTION_TRACE_PTR(ex_read_data_from_field, obj_desc);
78
79 /* Parameter validation */
80
81 if (!obj_desc) {
82 return_ACPI_STATUS(AE_AML_NO_OPERAND);
83 }
84 if (!ret_buffer_desc) {
85 return_ACPI_STATUS(AE_BAD_PARAMETER);
86 }
87
88 if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) {
89 /*
90 * If the buffer_field arguments have not been previously evaluated,
91 * evaluate them now and save the results.
92 */
93 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
94 status = acpi_ds_get_buffer_field_arguments(obj_desc);
95 if (ACPI_FAILURE(status)) {
96 return_ACPI_STATUS(status);
97 }
98 }
99 } else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
100 (obj_desc->field.region_obj->region.space_id ==
101 ACPI_ADR_SPACE_SMBUS
102 || obj_desc->field.region_obj->region.space_id ==
103 ACPI_ADR_SPACE_GSBUS
104 || obj_desc->field.region_obj->region.space_id ==
105 ACPI_ADR_SPACE_IPMI)) {
106 /*
107 * This is an SMBus, GSBus or IPMI read. We must create a buffer to hold
108 * the data and then directly access the region handler.
109 *
110 * Note: SMBus and GSBus protocol value is passed in upper 16-bits of Function
111 */
112 if (obj_desc->field.region_obj->region.space_id ==
113 ACPI_ADR_SPACE_SMBUS) {
114 length = ACPI_SMBUS_BUFFER_SIZE;
115 function =
116 ACPI_READ | (obj_desc->field.attribute << 16);
117 } else if (obj_desc->field.region_obj->region.space_id ==
118 ACPI_ADR_SPACE_GSBUS) {
119 length = ACPI_GSBUS_BUFFER_SIZE;
120 function =
121 ACPI_READ | (obj_desc->field.attribute << 16);
122 } else { /* IPMI */
123
124 length = ACPI_IPMI_BUFFER_SIZE;
125 function = ACPI_READ;
126 }
127
128 buffer_desc = acpi_ut_create_buffer_object(length);
129 if (!buffer_desc) {
130 return_ACPI_STATUS(AE_NO_MEMORY);
131 }
132
133 /* Lock entire transaction if requested */
134
135 acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
136
137 /* Call the region handler for the read */
138
139 status = acpi_ex_access_region(obj_desc, 0,
140 ACPI_CAST_PTR(u64,
141 buffer_desc->
142 buffer.pointer),
143 function);
144 acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
145 goto exit;
146 }
147
148 /*
149 * Allocate a buffer for the contents of the field.
150 *
151 * If the field is larger than the current integer width, create
152 * a BUFFER to hold it. Otherwise, use an INTEGER. This allows
153 * the use of arithmetic operators on the returned value if the
154 * field size is equal or smaller than an Integer.
155 *
156 * Note: Field.length is in bits.
157 */
158 length =
159 (acpi_size) ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->field.bit_length);
160 if (length > acpi_gbl_integer_byte_width) {
161
162 /* Field is too large for an Integer, create a Buffer instead */
163
164 buffer_desc = acpi_ut_create_buffer_object(length);
165 if (!buffer_desc) {
166 return_ACPI_STATUS(AE_NO_MEMORY);
167 }
168 buffer = buffer_desc->buffer.pointer;
169 } else {
170 /* Field will fit within an Integer (normal case) */
171
172 buffer_desc = acpi_ut_create_integer_object((u64) 0);
173 if (!buffer_desc) {
174 return_ACPI_STATUS(AE_NO_MEMORY);
175 }
176
177 length = acpi_gbl_integer_byte_width;
178 buffer = &buffer_desc->integer.value;
179 }
180
181 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
182 "FieldRead [TO]: Obj %p, Type %X, Buf %p, ByteLen %X\n",
183 obj_desc, obj_desc->common.type, buffer,
184 (u32) length));
185 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
186 "FieldRead [FROM]: BitLen %X, BitOff %X, ByteOff %X\n",
187 obj_desc->common_field.bit_length,
188 obj_desc->common_field.start_field_bit_offset,
189 obj_desc->common_field.base_byte_offset));
190
191 /* Lock entire transaction if requested */
192
193 acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
194
195 /* Read from the field */
196
197 status = acpi_ex_extract_from_field(obj_desc, buffer, (u32) length);
198 acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
199
200 exit:
201 if (ACPI_FAILURE(status)) {
202 acpi_ut_remove_reference(buffer_desc);
203 } else {
204 *ret_buffer_desc = buffer_desc;
205 }
206
207 return_ACPI_STATUS(status);
208}
209
210/*******************************************************************************
211 *
212 * FUNCTION: acpi_ex_write_data_to_field
213 *
214 * PARAMETERS: source_desc - Contains data to write
215 * obj_desc - The named field
216 * result_desc - Where the return value is returned, if any
217 *
218 * RETURN: Status
219 *
220 * DESCRIPTION: Write to a named field
221 *
222 ******************************************************************************/
223
224acpi_status
225acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
226 union acpi_operand_object *obj_desc,
227 union acpi_operand_object **result_desc)
228{
229 acpi_status status;
230 u32 length;
231 void *buffer;
232 union acpi_operand_object *buffer_desc;
233 u32 function;
234
235 ACPI_FUNCTION_TRACE_PTR(ex_write_data_to_field, obj_desc);
236
237 /* Parameter validation */
238
239 if (!source_desc || !obj_desc) {
240 return_ACPI_STATUS(AE_AML_NO_OPERAND);
241 }
242
243 if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) {
244 /*
245 * If the buffer_field arguments have not been previously evaluated,
246 * evaluate them now and save the results.
247 */
248 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
249 status = acpi_ds_get_buffer_field_arguments(obj_desc);
250 if (ACPI_FAILURE(status)) {
251 return_ACPI_STATUS(status);
252 }
253 }
254 } else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
255 (obj_desc->field.region_obj->region.space_id ==
256 ACPI_ADR_SPACE_SMBUS
257 || obj_desc->field.region_obj->region.space_id ==
258 ACPI_ADR_SPACE_GSBUS
259 || obj_desc->field.region_obj->region.space_id ==
260 ACPI_ADR_SPACE_IPMI)) {
261 /*
262 * This is an SMBus, GSBus or IPMI write. We will bypass the entire field
263 * mechanism and handoff the buffer directly to the handler. For
264 * these address spaces, the buffer is bi-directional; on a write,
265 * return data is returned in the same buffer.
266 *
267 * Source must be a buffer of sufficient size:
268 * ACPI_SMBUS_BUFFER_SIZE, ACPI_GSBUS_BUFFER_SIZE, or ACPI_IPMI_BUFFER_SIZE.
269 *
270 * Note: SMBus and GSBus protocol type is passed in upper 16-bits of Function
271 */
272 if (source_desc->common.type != ACPI_TYPE_BUFFER) {
273 ACPI_ERROR((AE_INFO,
274 "SMBus/IPMI/GenericSerialBus write requires Buffer, found type %s",
275 acpi_ut_get_object_type_name(source_desc)));
276
277 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
278 }
279
280 if (obj_desc->field.region_obj->region.space_id ==
281 ACPI_ADR_SPACE_SMBUS) {
282 length = ACPI_SMBUS_BUFFER_SIZE;
283 function =
284 ACPI_WRITE | (obj_desc->field.attribute << 16);
285 } else if (obj_desc->field.region_obj->region.space_id ==
286 ACPI_ADR_SPACE_GSBUS) {
287 length = ACPI_GSBUS_BUFFER_SIZE;
288 function =
289 ACPI_WRITE | (obj_desc->field.attribute << 16);
290 } else { /* IPMI */
291
292 length = ACPI_IPMI_BUFFER_SIZE;
293 function = ACPI_WRITE;
294 }
295
296 if (source_desc->buffer.length < length) {
297 ACPI_ERROR((AE_INFO,
298 "SMBus/IPMI/GenericSerialBus write requires Buffer of length %u, found length %u",
299 length, source_desc->buffer.length));
300
301 return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
302 }
303
304 /* Create the bi-directional buffer */
305
306 buffer_desc = acpi_ut_create_buffer_object(length);
307 if (!buffer_desc) {
308 return_ACPI_STATUS(AE_NO_MEMORY);
309 }
310
311 buffer = buffer_desc->buffer.pointer;
312 ACPI_MEMCPY(buffer, source_desc->buffer.pointer, length);
313
314 /* Lock entire transaction if requested */
315
316 acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
317
318 /*
319 * Perform the write (returns status and perhaps data in the
320 * same buffer)
321 */
322 status = acpi_ex_access_region(obj_desc, 0,
323 (u64 *) buffer, function);
324 acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
325
326 *result_desc = buffer_desc;
327 return_ACPI_STATUS(status);
328 }
329
330 /* Get a pointer to the data to be written */
331
332 switch (source_desc->common.type) {
333 case ACPI_TYPE_INTEGER:
334 buffer = &source_desc->integer.value;
335 length = sizeof(source_desc->integer.value);
336 break;
337
338 case ACPI_TYPE_BUFFER:
339 buffer = source_desc->buffer.pointer;
340 length = source_desc->buffer.length;
341 break;
342
343 case ACPI_TYPE_STRING:
344 buffer = source_desc->string.pointer;
345 length = source_desc->string.length;
346 break;
347
348 default:
349 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
350 }
351
352 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
353 "FieldWrite [FROM]: Obj %p (%s:%X), Buf %p, ByteLen %X\n",
354 source_desc,
355 acpi_ut_get_type_name(source_desc->common.type),
356 source_desc->common.type, buffer, length));
357
358 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
359 "FieldWrite [TO]: Obj %p (%s:%X), BitLen %X, BitOff %X, ByteOff %X\n",
360 obj_desc,
361 acpi_ut_get_type_name(obj_desc->common.type),
362 obj_desc->common.type,
363 obj_desc->common_field.bit_length,
364 obj_desc->common_field.start_field_bit_offset,
365 obj_desc->common_field.base_byte_offset));
366
367 /* Lock entire transaction if requested */
368
369 acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
370
371 /* Write to the field */
372
373 status = acpi_ex_insert_into_field(obj_desc, buffer, length);
374 acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
375
376 return_ACPI_STATUS(status);
377}
1/******************************************************************************
2 *
3 * Module Name: exfield - ACPI AML (p-code) execution - field manipulation
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2011, Intel Corp.
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
44#include <acpi/acpi.h>
45#include "accommon.h"
46#include "acdispat.h"
47#include "acinterp.h"
48
49#define _COMPONENT ACPI_EXECUTER
50ACPI_MODULE_NAME("exfield")
51
52/*******************************************************************************
53 *
54 * FUNCTION: acpi_ex_read_data_from_field
55 *
56 * PARAMETERS: walk_state - Current execution state
57 * obj_desc - The named field
58 * ret_buffer_desc - Where the return data object is stored
59 *
60 * RETURN: Status
61 *
62 * DESCRIPTION: Read from a named field. Returns either an Integer or a
63 * Buffer, depending on the size of the field.
64 *
65 ******************************************************************************/
66acpi_status
67acpi_ex_read_data_from_field(struct acpi_walk_state *walk_state,
68 union acpi_operand_object *obj_desc,
69 union acpi_operand_object **ret_buffer_desc)
70{
71 acpi_status status;
72 union acpi_operand_object *buffer_desc;
73 acpi_size length;
74 void *buffer;
75 u32 function;
76
77 ACPI_FUNCTION_TRACE_PTR(ex_read_data_from_field, obj_desc);
78
79 /* Parameter validation */
80
81 if (!obj_desc) {
82 return_ACPI_STATUS(AE_AML_NO_OPERAND);
83 }
84 if (!ret_buffer_desc) {
85 return_ACPI_STATUS(AE_BAD_PARAMETER);
86 }
87
88 if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) {
89 /*
90 * If the buffer_field arguments have not been previously evaluated,
91 * evaluate them now and save the results.
92 */
93 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
94 status = acpi_ds_get_buffer_field_arguments(obj_desc);
95 if (ACPI_FAILURE(status)) {
96 return_ACPI_STATUS(status);
97 }
98 }
99 } else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
100 (obj_desc->field.region_obj->region.space_id ==
101 ACPI_ADR_SPACE_SMBUS
102 || obj_desc->field.region_obj->region.space_id ==
103 ACPI_ADR_SPACE_IPMI)) {
104 /*
105 * This is an SMBus or IPMI read. We must create a buffer to hold
106 * the data and then directly access the region handler.
107 *
108 * Note: Smbus protocol value is passed in upper 16-bits of Function
109 */
110 if (obj_desc->field.region_obj->region.space_id ==
111 ACPI_ADR_SPACE_SMBUS) {
112 length = ACPI_SMBUS_BUFFER_SIZE;
113 function =
114 ACPI_READ | (obj_desc->field.attribute << 16);
115 } else { /* IPMI */
116
117 length = ACPI_IPMI_BUFFER_SIZE;
118 function = ACPI_READ;
119 }
120
121 buffer_desc = acpi_ut_create_buffer_object(length);
122 if (!buffer_desc) {
123 return_ACPI_STATUS(AE_NO_MEMORY);
124 }
125
126 /* Lock entire transaction if requested */
127
128 acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
129
130 /* Call the region handler for the read */
131
132 status = acpi_ex_access_region(obj_desc, 0,
133 ACPI_CAST_PTR(u64,
134 buffer_desc->
135 buffer.pointer),
136 function);
137 acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
138 goto exit;
139 }
140
141 /*
142 * Allocate a buffer for the contents of the field.
143 *
144 * If the field is larger than the current integer width, create
145 * a BUFFER to hold it. Otherwise, use an INTEGER. This allows
146 * the use of arithmetic operators on the returned value if the
147 * field size is equal or smaller than an Integer.
148 *
149 * Note: Field.length is in bits.
150 */
151 length =
152 (acpi_size) ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->field.bit_length);
153 if (length > acpi_gbl_integer_byte_width) {
154
155 /* Field is too large for an Integer, create a Buffer instead */
156
157 buffer_desc = acpi_ut_create_buffer_object(length);
158 if (!buffer_desc) {
159 return_ACPI_STATUS(AE_NO_MEMORY);
160 }
161 buffer = buffer_desc->buffer.pointer;
162 } else {
163 /* Field will fit within an Integer (normal case) */
164
165 buffer_desc = acpi_ut_create_integer_object((u64) 0);
166 if (!buffer_desc) {
167 return_ACPI_STATUS(AE_NO_MEMORY);
168 }
169
170 length = acpi_gbl_integer_byte_width;
171 buffer = &buffer_desc->integer.value;
172 }
173
174 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
175 "FieldRead [TO]: Obj %p, Type %X, Buf %p, ByteLen %X\n",
176 obj_desc, obj_desc->common.type, buffer,
177 (u32) length));
178 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
179 "FieldRead [FROM]: BitLen %X, BitOff %X, ByteOff %X\n",
180 obj_desc->common_field.bit_length,
181 obj_desc->common_field.start_field_bit_offset,
182 obj_desc->common_field.base_byte_offset));
183
184 /* Lock entire transaction if requested */
185
186 acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
187
188 /* Read from the field */
189
190 status = acpi_ex_extract_from_field(obj_desc, buffer, (u32) length);
191 acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
192
193 exit:
194 if (ACPI_FAILURE(status)) {
195 acpi_ut_remove_reference(buffer_desc);
196 } else {
197 *ret_buffer_desc = buffer_desc;
198 }
199
200 return_ACPI_STATUS(status);
201}
202
203/*******************************************************************************
204 *
205 * FUNCTION: acpi_ex_write_data_to_field
206 *
207 * PARAMETERS: source_desc - Contains data to write
208 * obj_desc - The named field
209 * result_desc - Where the return value is returned, if any
210 *
211 * RETURN: Status
212 *
213 * DESCRIPTION: Write to a named field
214 *
215 ******************************************************************************/
216
217acpi_status
218acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
219 union acpi_operand_object *obj_desc,
220 union acpi_operand_object **result_desc)
221{
222 acpi_status status;
223 u32 length;
224 void *buffer;
225 union acpi_operand_object *buffer_desc;
226 u32 function;
227
228 ACPI_FUNCTION_TRACE_PTR(ex_write_data_to_field, obj_desc);
229
230 /* Parameter validation */
231
232 if (!source_desc || !obj_desc) {
233 return_ACPI_STATUS(AE_AML_NO_OPERAND);
234 }
235
236 if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) {
237 /*
238 * If the buffer_field arguments have not been previously evaluated,
239 * evaluate them now and save the results.
240 */
241 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
242 status = acpi_ds_get_buffer_field_arguments(obj_desc);
243 if (ACPI_FAILURE(status)) {
244 return_ACPI_STATUS(status);
245 }
246 }
247 } else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
248 (obj_desc->field.region_obj->region.space_id ==
249 ACPI_ADR_SPACE_SMBUS
250 || obj_desc->field.region_obj->region.space_id ==
251 ACPI_ADR_SPACE_IPMI)) {
252 /*
253 * This is an SMBus or IPMI write. We will bypass the entire field
254 * mechanism and handoff the buffer directly to the handler. For
255 * these address spaces, the buffer is bi-directional; on a write,
256 * return data is returned in the same buffer.
257 *
258 * Source must be a buffer of sufficient size:
259 * ACPI_SMBUS_BUFFER_SIZE or ACPI_IPMI_BUFFER_SIZE.
260 *
261 * Note: SMBus protocol type is passed in upper 16-bits of Function
262 */
263 if (source_desc->common.type != ACPI_TYPE_BUFFER) {
264 ACPI_ERROR((AE_INFO,
265 "SMBus or IPMI write requires Buffer, found type %s",
266 acpi_ut_get_object_type_name(source_desc)));
267
268 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
269 }
270
271 if (obj_desc->field.region_obj->region.space_id ==
272 ACPI_ADR_SPACE_SMBUS) {
273 length = ACPI_SMBUS_BUFFER_SIZE;
274 function =
275 ACPI_WRITE | (obj_desc->field.attribute << 16);
276 } else { /* IPMI */
277
278 length = ACPI_IPMI_BUFFER_SIZE;
279 function = ACPI_WRITE;
280 }
281
282 if (source_desc->buffer.length < length) {
283 ACPI_ERROR((AE_INFO,
284 "SMBus or IPMI write requires Buffer of length %u, found length %u",
285 length, source_desc->buffer.length));
286
287 return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
288 }
289
290 /* Create the bi-directional buffer */
291
292 buffer_desc = acpi_ut_create_buffer_object(length);
293 if (!buffer_desc) {
294 return_ACPI_STATUS(AE_NO_MEMORY);
295 }
296
297 buffer = buffer_desc->buffer.pointer;
298 ACPI_MEMCPY(buffer, source_desc->buffer.pointer, length);
299
300 /* Lock entire transaction if requested */
301
302 acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
303
304 /*
305 * Perform the write (returns status and perhaps data in the
306 * same buffer)
307 */
308 status = acpi_ex_access_region(obj_desc, 0,
309 (u64 *) buffer, function);
310 acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
311
312 *result_desc = buffer_desc;
313 return_ACPI_STATUS(status);
314 }
315
316 /* Get a pointer to the data to be written */
317
318 switch (source_desc->common.type) {
319 case ACPI_TYPE_INTEGER:
320 buffer = &source_desc->integer.value;
321 length = sizeof(source_desc->integer.value);
322 break;
323
324 case ACPI_TYPE_BUFFER:
325 buffer = source_desc->buffer.pointer;
326 length = source_desc->buffer.length;
327 break;
328
329 case ACPI_TYPE_STRING:
330 buffer = source_desc->string.pointer;
331 length = source_desc->string.length;
332 break;
333
334 default:
335 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
336 }
337
338 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
339 "FieldWrite [FROM]: Obj %p (%s:%X), Buf %p, ByteLen %X\n",
340 source_desc,
341 acpi_ut_get_type_name(source_desc->common.type),
342 source_desc->common.type, buffer, length));
343
344 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
345 "FieldWrite [TO]: Obj %p (%s:%X), BitLen %X, BitOff %X, ByteOff %X\n",
346 obj_desc,
347 acpi_ut_get_type_name(obj_desc->common.type),
348 obj_desc->common.type,
349 obj_desc->common_field.bit_length,
350 obj_desc->common_field.start_field_bit_offset,
351 obj_desc->common_field.base_byte_offset));
352
353 /* Lock entire transaction if requested */
354
355 acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
356
357 /* Write to the field */
358
359 status = acpi_ex_insert_into_field(obj_desc, buffer, length);
360 acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
361
362 return_ACPI_STATUS(status);
363}