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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 - 2014, 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#include "amlcode.h"
49
50#define _COMPONENT ACPI_EXECUTER
51ACPI_MODULE_NAME("exfield")
52
53/* Local prototypes */
54static u32
55acpi_ex_get_serial_access_length(u32 accessor_type, u32 access_length);
56
57/*******************************************************************************
58 *
59 * FUNCTION: acpi_get_serial_access_bytes
60 *
61 * PARAMETERS: accessor_type - The type of the protocol indicated by region
62 * field access attributes
63 * access_length - The access length of the region field
64 *
65 * RETURN: Decoded access length
66 *
67 * DESCRIPTION: This routine returns the length of the generic_serial_bus
68 * protocol bytes
69 *
70 ******************************************************************************/
71
72static u32
73acpi_ex_get_serial_access_length(u32 accessor_type, u32 access_length)
74{
75 u32 length;
76
77 switch (accessor_type) {
78 case AML_FIELD_ATTRIB_QUICK:
79
80 length = 0;
81 break;
82
83 case AML_FIELD_ATTRIB_SEND_RCV:
84 case AML_FIELD_ATTRIB_BYTE:
85
86 length = 1;
87 break;
88
89 case AML_FIELD_ATTRIB_WORD:
90 case AML_FIELD_ATTRIB_WORD_CALL:
91
92 length = 2;
93 break;
94
95 case AML_FIELD_ATTRIB_MULTIBYTE:
96 case AML_FIELD_ATTRIB_RAW_BYTES:
97 case AML_FIELD_ATTRIB_RAW_PROCESS:
98
99 length = access_length;
100 break;
101
102 case AML_FIELD_ATTRIB_BLOCK:
103 case AML_FIELD_ATTRIB_BLOCK_CALL:
104 default:
105
106 length = ACPI_GSBUS_BUFFER_SIZE;
107 break;
108 }
109
110 return (length);
111}
112
113/*******************************************************************************
114 *
115 * FUNCTION: acpi_ex_read_data_from_field
116 *
117 * PARAMETERS: walk_state - Current execution state
118 * obj_desc - The named field
119 * ret_buffer_desc - Where the return data object is stored
120 *
121 * RETURN: Status
122 *
123 * DESCRIPTION: Read from a named field. Returns either an Integer or a
124 * Buffer, depending on the size of the field.
125 *
126 ******************************************************************************/
127
128acpi_status
129acpi_ex_read_data_from_field(struct acpi_walk_state * walk_state,
130 union acpi_operand_object *obj_desc,
131 union acpi_operand_object **ret_buffer_desc)
132{
133 acpi_status status;
134 union acpi_operand_object *buffer_desc;
135 acpi_size length;
136 void *buffer;
137 u32 function;
138 u16 accessor_type;
139
140 ACPI_FUNCTION_TRACE_PTR(ex_read_data_from_field, obj_desc);
141
142 /* Parameter validation */
143
144 if (!obj_desc) {
145 return_ACPI_STATUS(AE_AML_NO_OPERAND);
146 }
147 if (!ret_buffer_desc) {
148 return_ACPI_STATUS(AE_BAD_PARAMETER);
149 }
150
151 if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) {
152 /*
153 * If the buffer_field arguments have not been previously evaluated,
154 * evaluate them now and save the results.
155 */
156 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
157 status = acpi_ds_get_buffer_field_arguments(obj_desc);
158 if (ACPI_FAILURE(status)) {
159 return_ACPI_STATUS(status);
160 }
161 }
162 } else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
163 (obj_desc->field.region_obj->region.space_id ==
164 ACPI_ADR_SPACE_SMBUS
165 || obj_desc->field.region_obj->region.space_id ==
166 ACPI_ADR_SPACE_GSBUS
167 || obj_desc->field.region_obj->region.space_id ==
168 ACPI_ADR_SPACE_IPMI)) {
169 /*
170 * This is an SMBus, GSBus or IPMI read. We must create a buffer to hold
171 * the data and then directly access the region handler.
172 *
173 * Note: SMBus and GSBus protocol value is passed in upper 16-bits of Function
174 */
175 if (obj_desc->field.region_obj->region.space_id ==
176 ACPI_ADR_SPACE_SMBUS) {
177 length = ACPI_SMBUS_BUFFER_SIZE;
178 function =
179 ACPI_READ | (obj_desc->field.attribute << 16);
180 } else if (obj_desc->field.region_obj->region.space_id ==
181 ACPI_ADR_SPACE_GSBUS) {
182 accessor_type = obj_desc->field.attribute;
183 length = acpi_ex_get_serial_access_length(accessor_type,
184 obj_desc->
185 field.
186 access_length);
187
188 /*
189 * Add additional 2 bytes for modeled generic_serial_bus data buffer:
190 * typedef struct {
191 * BYTEStatus; // Byte 0 of the data buffer
192 * BYTELength; // Byte 1 of the data buffer
193 * BYTE[x-1]Data; // Bytes 2-x of the arbitrary length data buffer,
194 * }
195 */
196 length += 2;
197 function = ACPI_READ | (accessor_type << 16);
198 } else { /* IPMI */
199
200 length = ACPI_IPMI_BUFFER_SIZE;
201 function = ACPI_READ;
202 }
203
204 buffer_desc = acpi_ut_create_buffer_object(length);
205 if (!buffer_desc) {
206 return_ACPI_STATUS(AE_NO_MEMORY);
207 }
208
209 /* Lock entire transaction if requested */
210
211 acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
212
213 /* Call the region handler for the read */
214
215 status = acpi_ex_access_region(obj_desc, 0,
216 ACPI_CAST_PTR(u64,
217 buffer_desc->
218 buffer.pointer),
219 function);
220 acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
221 goto exit;
222 }
223
224 /*
225 * Allocate a buffer for the contents of the field.
226 *
227 * If the field is larger than the current integer width, create
228 * a BUFFER to hold it. Otherwise, use an INTEGER. This allows
229 * the use of arithmetic operators on the returned value if the
230 * field size is equal or smaller than an Integer.
231 *
232 * Note: Field.length is in bits.
233 */
234 length =
235 (acpi_size) ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->field.bit_length);
236 if (length > acpi_gbl_integer_byte_width) {
237
238 /* Field is too large for an Integer, create a Buffer instead */
239
240 buffer_desc = acpi_ut_create_buffer_object(length);
241 if (!buffer_desc) {
242 return_ACPI_STATUS(AE_NO_MEMORY);
243 }
244 buffer = buffer_desc->buffer.pointer;
245 } else {
246 /* Field will fit within an Integer (normal case) */
247
248 buffer_desc = acpi_ut_create_integer_object((u64) 0);
249 if (!buffer_desc) {
250 return_ACPI_STATUS(AE_NO_MEMORY);
251 }
252
253 length = acpi_gbl_integer_byte_width;
254 buffer = &buffer_desc->integer.value;
255 }
256
257 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
258 "FieldRead [TO]: Obj %p, Type %X, Buf %p, ByteLen %X\n",
259 obj_desc, obj_desc->common.type, buffer,
260 (u32) length));
261 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
262 "FieldRead [FROM]: BitLen %X, BitOff %X, ByteOff %X\n",
263 obj_desc->common_field.bit_length,
264 obj_desc->common_field.start_field_bit_offset,
265 obj_desc->common_field.base_byte_offset));
266
267 /* Lock entire transaction if requested */
268
269 acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
270
271 /* Read from the field */
272
273 status = acpi_ex_extract_from_field(obj_desc, buffer, (u32) length);
274 acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
275
276exit:
277 if (ACPI_FAILURE(status)) {
278 acpi_ut_remove_reference(buffer_desc);
279 } else {
280 *ret_buffer_desc = buffer_desc;
281 }
282
283 return_ACPI_STATUS(status);
284}
285
286/*******************************************************************************
287 *
288 * FUNCTION: acpi_ex_write_data_to_field
289 *
290 * PARAMETERS: source_desc - Contains data to write
291 * obj_desc - The named field
292 * result_desc - Where the return value is returned, if any
293 *
294 * RETURN: Status
295 *
296 * DESCRIPTION: Write to a named field
297 *
298 ******************************************************************************/
299
300acpi_status
301acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
302 union acpi_operand_object *obj_desc,
303 union acpi_operand_object **result_desc)
304{
305 acpi_status status;
306 u32 length;
307 void *buffer;
308 union acpi_operand_object *buffer_desc;
309 u32 function;
310 u16 accessor_type;
311
312 ACPI_FUNCTION_TRACE_PTR(ex_write_data_to_field, obj_desc);
313
314 /* Parameter validation */
315
316 if (!source_desc || !obj_desc) {
317 return_ACPI_STATUS(AE_AML_NO_OPERAND);
318 }
319
320 if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) {
321 /*
322 * If the buffer_field arguments have not been previously evaluated,
323 * evaluate them now and save the results.
324 */
325 if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
326 status = acpi_ds_get_buffer_field_arguments(obj_desc);
327 if (ACPI_FAILURE(status)) {
328 return_ACPI_STATUS(status);
329 }
330 }
331 } else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
332 (obj_desc->field.region_obj->region.space_id ==
333 ACPI_ADR_SPACE_SMBUS
334 || obj_desc->field.region_obj->region.space_id ==
335 ACPI_ADR_SPACE_GSBUS
336 || obj_desc->field.region_obj->region.space_id ==
337 ACPI_ADR_SPACE_IPMI)) {
338 /*
339 * This is an SMBus, GSBus or IPMI write. We will bypass the entire field
340 * mechanism and handoff the buffer directly to the handler. For
341 * these address spaces, the buffer is bi-directional; on a write,
342 * return data is returned in the same buffer.
343 *
344 * Source must be a buffer of sufficient size:
345 * ACPI_SMBUS_BUFFER_SIZE, ACPI_GSBUS_BUFFER_SIZE, or ACPI_IPMI_BUFFER_SIZE.
346 *
347 * Note: SMBus and GSBus protocol type is passed in upper 16-bits of Function
348 */
349 if (source_desc->common.type != ACPI_TYPE_BUFFER) {
350 ACPI_ERROR((AE_INFO,
351 "SMBus/IPMI/GenericSerialBus write requires Buffer, found type %s",
352 acpi_ut_get_object_type_name(source_desc)));
353
354 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
355 }
356
357 if (obj_desc->field.region_obj->region.space_id ==
358 ACPI_ADR_SPACE_SMBUS) {
359 length = ACPI_SMBUS_BUFFER_SIZE;
360 function =
361 ACPI_WRITE | (obj_desc->field.attribute << 16);
362 } else if (obj_desc->field.region_obj->region.space_id ==
363 ACPI_ADR_SPACE_GSBUS) {
364 accessor_type = obj_desc->field.attribute;
365 length = acpi_ex_get_serial_access_length(accessor_type,
366 obj_desc->
367 field.
368 access_length);
369
370 /*
371 * Add additional 2 bytes for modeled generic_serial_bus data buffer:
372 * typedef struct {
373 * BYTEStatus; // Byte 0 of the data buffer
374 * BYTELength; // Byte 1 of the data buffer
375 * BYTE[x-1]Data; // Bytes 2-x of the arbitrary length data buffer,
376 * }
377 */
378 length += 2;
379 function = ACPI_WRITE | (accessor_type << 16);
380 } else { /* IPMI */
381
382 length = ACPI_IPMI_BUFFER_SIZE;
383 function = ACPI_WRITE;
384 }
385
386 if (source_desc->buffer.length < length) {
387 ACPI_ERROR((AE_INFO,
388 "SMBus/IPMI/GenericSerialBus write requires Buffer of length %u, found length %u",
389 length, source_desc->buffer.length));
390
391 return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
392 }
393
394 /* Create the bi-directional buffer */
395
396 buffer_desc = acpi_ut_create_buffer_object(length);
397 if (!buffer_desc) {
398 return_ACPI_STATUS(AE_NO_MEMORY);
399 }
400
401 buffer = buffer_desc->buffer.pointer;
402 ACPI_MEMCPY(buffer, source_desc->buffer.pointer, length);
403
404 /* Lock entire transaction if requested */
405
406 acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
407
408 /*
409 * Perform the write (returns status and perhaps data in the
410 * same buffer)
411 */
412 status = acpi_ex_access_region(obj_desc, 0,
413 (u64 *) buffer, function);
414 acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
415
416 *result_desc = buffer_desc;
417 return_ACPI_STATUS(status);
418 }
419
420 /* Get a pointer to the data to be written */
421
422 switch (source_desc->common.type) {
423 case ACPI_TYPE_INTEGER:
424
425 buffer = &source_desc->integer.value;
426 length = sizeof(source_desc->integer.value);
427 break;
428
429 case ACPI_TYPE_BUFFER:
430
431 buffer = source_desc->buffer.pointer;
432 length = source_desc->buffer.length;
433 break;
434
435 case ACPI_TYPE_STRING:
436
437 buffer = source_desc->string.pointer;
438 length = source_desc->string.length;
439 break;
440
441 default:
442
443 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
444 }
445
446 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
447 "FieldWrite [FROM]: Obj %p (%s:%X), Buf %p, ByteLen %X\n",
448 source_desc,
449 acpi_ut_get_type_name(source_desc->common.type),
450 source_desc->common.type, buffer, length));
451
452 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
453 "FieldWrite [TO]: Obj %p (%s:%X), BitLen %X, BitOff %X, ByteOff %X\n",
454 obj_desc,
455 acpi_ut_get_type_name(obj_desc->common.type),
456 obj_desc->common.type,
457 obj_desc->common_field.bit_length,
458 obj_desc->common_field.start_field_bit_offset,
459 obj_desc->common_field.base_byte_offset));
460
461 /* Lock entire transaction if requested */
462
463 acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
464
465 /* Write to the field */
466
467 status = acpi_ex_insert_into_field(obj_desc, buffer, length);
468 acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
469
470 return_ACPI_STATUS(status);
471}