blob: f17d2ff0031bc8933822698a60392b50f621bf11 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/******************************************************************************
2 *
3 * Module Name: exfield - ACPI AML (p-code) execution - field manipulation
4 *
5 *****************************************************************************/
6
7/*
Bob Moorea8357b02010-01-22 19:07:36 +08008 * Copyright (C) 2000 - 2010, Intel Corp.
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include <acpi/acpi.h>
Len Browne2f7a772009-01-09 00:30:03 -050045#include "accommon.h"
46#include "acdispat.h"
47#include "acinterp.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#define _COMPONENT ACPI_EXECUTER
Len Brown4be44fc2005-08-05 00:44:28 -040050ACPI_MODULE_NAME("exfield")
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
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 ******************************************************************************/
Linus Torvalds1da177e2005-04-16 15:20:36 -070066acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -040067acpi_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)
Linus Torvalds1da177e2005-04-16 15:20:36 -070070{
Len Brown4be44fc2005-08-05 00:44:28 -040071 acpi_status status;
72 union acpi_operand_object *buffer_desc;
73 acpi_size length;
74 void *buffer;
Lin Ming6557a492009-06-24 11:32:04 +080075 u32 function;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
Bob Mooreb229cf92006-04-21 17:15:00 -040077 ACPI_FUNCTION_TRACE_PTR(ex_read_data_from_field, obj_desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
79 /* Parameter validation */
80
81 if (!obj_desc) {
Len Brown4be44fc2005-08-05 00:44:28 -040082 return_ACPI_STATUS(AE_AML_NO_OPERAND);
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 }
Robert Moore88ac00f2005-05-26 00:00:00 -040084 if (!ret_buffer_desc) {
Len Brown4be44fc2005-08-05 00:44:28 -040085 return_ACPI_STATUS(AE_BAD_PARAMETER);
Robert Moore88ac00f2005-05-26 00:00:00 -040086 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
Bob Moore3371c192009-02-18 14:44:03 +080088 if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 /*
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)) {
Len Brown4be44fc2005-08-05 00:44:28 -040094 status = acpi_ds_get_buffer_field_arguments(obj_desc);
95 if (ACPI_FAILURE(status)) {
96 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 }
98 }
Bob Moore3371c192009-02-18 14:44:03 +080099 } else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
100 (obj_desc->field.region_obj->region.space_id ==
Lin Ming6557a492009-06-24 11:32:04 +0800101 ACPI_ADR_SPACE_SMBUS
102 || obj_desc->field.region_obj->region.space_id ==
103 ACPI_ADR_SPACE_IPMI)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 /*
Lin Ming6557a492009-06-24 11:32:04 +0800105 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 */
Lin Ming6557a492009-06-24 11:32:04 +0800110 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 if (!buffer_desc) {
Len Brown4be44fc2005-08-05 00:44:28 -0400123 return_ACPI_STATUS(AE_NO_MEMORY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 }
125
126 /* Lock entire transaction if requested */
127
Bob Mooreba886cd2008-04-10 19:06:37 +0400128 acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
Lin Ming6557a492009-06-24 11:32:04 +0800130 /* Call the region handler for the read */
131
Len Brown4be44fc2005-08-05 00:44:28 -0400132 status = acpi_ex_access_region(obj_desc, 0,
Bob Moore5df7e6c2010-01-21 10:06:32 +0800133 ACPI_CAST_PTR(u64,
Len Brown4be44fc2005-08-05 00:44:28 -0400134 buffer_desc->
135 buffer.pointer),
Lin Ming6557a492009-06-24 11:32:04 +0800136 function);
Bob Mooref02e9fa2008-04-10 19:06:37 +0400137 acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 goto exit;
139 }
140
141 /*
142 * Allocate a buffer for the contents of the field.
143 *
Bob Moore5df7e6c2010-01-21 10:06:32 +0800144 * If the field is larger than the current integer width, create
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 * 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 */
Len Brown4be44fc2005-08-05 00:44:28 -0400151 length =
152 (acpi_size) ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->field.bit_length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 if (length > acpi_gbl_integer_byte_width) {
Bob Moore52fc0b02006-10-02 00:00:00 -0400154
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 /* Field is too large for an Integer, create a Buffer instead */
156
Len Brown4be44fc2005-08-05 00:44:28 -0400157 buffer_desc = acpi_ut_create_buffer_object(length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 if (!buffer_desc) {
Len Brown4be44fc2005-08-05 00:44:28 -0400159 return_ACPI_STATUS(AE_NO_MEMORY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 }
161 buffer = buffer_desc->buffer.pointer;
Len Brown4be44fc2005-08-05 00:44:28 -0400162 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 /* Field will fit within an Integer (normal case) */
164
Bob Mooredc95a272009-11-12 09:52:45 +0800165 buffer_desc = acpi_ut_create_integer_object((u64) 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 if (!buffer_desc) {
Len Brown4be44fc2005-08-05 00:44:28 -0400167 return_ACPI_STATUS(AE_NO_MEMORY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 }
169
170 length = acpi_gbl_integer_byte_width;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 buffer = &buffer_desc->integer.value;
172 }
173
Len Brown4be44fc2005-08-05 00:44:28 -0400174 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
Bob Mooreb229cf92006-04-21 17:15:00 -0400175 "FieldRead [TO]: Obj %p, Type %X, Buf %p, ByteLen %X\n",
Bob Moore3371c192009-02-18 14:44:03 +0800176 obj_desc, obj_desc->common.type, buffer,
Len Brown4be44fc2005-08-05 00:44:28 -0400177 (u32) length));
178 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
Bob Mooreb229cf92006-04-21 17:15:00 -0400179 "FieldRead [FROM]: BitLen %X, BitOff %X, ByteOff %X\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400180 obj_desc->common_field.bit_length,
181 obj_desc->common_field.start_field_bit_offset,
182 obj_desc->common_field.base_byte_offset));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183
184 /* Lock entire transaction if requested */
185
Bob Mooreba886cd2008-04-10 19:06:37 +0400186 acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187
188 /* Read from the field */
189
Len Brown4be44fc2005-08-05 00:44:28 -0400190 status = acpi_ex_extract_from_field(obj_desc, buffer, (u32) length);
Bob Mooref02e9fa2008-04-10 19:06:37 +0400191 acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192
Len Brown4be44fc2005-08-05 00:44:28 -0400193 exit:
194 if (ACPI_FAILURE(status)) {
195 acpi_ut_remove_reference(buffer_desc);
196 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 *ret_buffer_desc = buffer_desc;
198 }
199
Len Brown4be44fc2005-08-05 00:44:28 -0400200 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201}
202
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203/*******************************************************************************
204 *
205 * FUNCTION: acpi_ex_write_data_to_field
206 *
207 * PARAMETERS: source_desc - Contains data to write
208 * obj_desc - The named field
Robert Moore44f6c012005-04-18 22:49:35 -0400209 * result_desc - Where the return value is returned, if any
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 *
211 * RETURN: Status
212 *
213 * DESCRIPTION: Write to a named field
214 *
215 ******************************************************************************/
216
217acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -0400218acpi_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)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221{
Len Brown4be44fc2005-08-05 00:44:28 -0400222 acpi_status status;
223 u32 length;
Len Brown4be44fc2005-08-05 00:44:28 -0400224 void *buffer;
Len Brown4be44fc2005-08-05 00:44:28 -0400225 union acpi_operand_object *buffer_desc;
Lin Ming6557a492009-06-24 11:32:04 +0800226 u32 function;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227
Bob Mooreb229cf92006-04-21 17:15:00 -0400228 ACPI_FUNCTION_TRACE_PTR(ex_write_data_to_field, obj_desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229
230 /* Parameter validation */
231
232 if (!source_desc || !obj_desc) {
Len Brown4be44fc2005-08-05 00:44:28 -0400233 return_ACPI_STATUS(AE_AML_NO_OPERAND);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 }
235
Bob Moore3371c192009-02-18 14:44:03 +0800236 if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 /*
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)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400242 status = acpi_ds_get_buffer_field_arguments(obj_desc);
243 if (ACPI_FAILURE(status)) {
244 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 }
246 }
Bob Moore3371c192009-02-18 14:44:03 +0800247 } else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
248 (obj_desc->field.region_obj->region.space_id ==
Lin Ming6557a492009-06-24 11:32:04 +0800249 ACPI_ADR_SPACE_SMBUS
250 || obj_desc->field.region_obj->region.space_id ==
251 ACPI_ADR_SPACE_IPMI)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 /*
Lin Ming6557a492009-06-24 11:32:04 +0800253 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 *
Lin Ming6557a492009-06-24 11:32:04 +0800258 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 */
Bob Moore3371c192009-02-18 14:44:03 +0800263 if (source_desc->common.type != ACPI_TYPE_BUFFER) {
Bob Mooreb8e4d892006-01-27 16:43:00 -0500264 ACPI_ERROR((AE_INFO,
Lin Ming6557a492009-06-24 11:32:04 +0800265 "SMBus or IPMI write requires Buffer, found type %s",
Bob Mooreb8e4d892006-01-27 16:43:00 -0500266 acpi_ut_get_object_type_name(source_desc)));
Robert Moore44f6c012005-04-18 22:49:35 -0400267
Len Brown4be44fc2005-08-05 00:44:28 -0400268 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 }
270
Lin Ming6557a492009-06-24 11:32:04 +0800271 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) {
Bob Mooreb8e4d892006-01-27 16:43:00 -0500283 ACPI_ERROR((AE_INFO,
Bob Mooref6a22b02010-03-05 17:56:40 +0800284 "SMBus or IPMI write requires Buffer of length %u, found length %u",
Lin Ming6557a492009-06-24 11:32:04 +0800285 length, source_desc->buffer.length));
Robert Moore44f6c012005-04-18 22:49:35 -0400286
Len Brown4be44fc2005-08-05 00:44:28 -0400287 return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 }
289
Lin Ming6557a492009-06-24 11:32:04 +0800290 /* Create the bi-directional buffer */
291
292 buffer_desc = acpi_ut_create_buffer_object(length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 if (!buffer_desc) {
Len Brown4be44fc2005-08-05 00:44:28 -0400294 return_ACPI_STATUS(AE_NO_MEMORY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 }
296
297 buffer = buffer_desc->buffer.pointer;
Lin Ming6557a492009-06-24 11:32:04 +0800298 ACPI_MEMCPY(buffer, source_desc->buffer.pointer, length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
300 /* Lock entire transaction if requested */
301
Bob Mooreba886cd2008-04-10 19:06:37 +0400302 acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
304 /*
Robert Moore44f6c012005-04-18 22:49:35 -0400305 * Perform the write (returns status and perhaps data in the
306 * same buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 */
Len Brown4be44fc2005-08-05 00:44:28 -0400308 status = acpi_ex_access_region(obj_desc, 0,
Bob Moore5df7e6c2010-01-21 10:06:32 +0800309 (u64 *) buffer, function);
Bob Mooref02e9fa2008-04-10 19:06:37 +0400310 acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311
312 *result_desc = buffer_desc;
Len Brown4be44fc2005-08-05 00:44:28 -0400313 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 }
315
Robert Moore44f6c012005-04-18 22:49:35 -0400316 /* Get a pointer to the data to be written */
317
Bob Moore3371c192009-02-18 14:44:03 +0800318 switch (source_desc->common.type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 case ACPI_TYPE_INTEGER:
320 buffer = &source_desc->integer.value;
Len Brown4be44fc2005-08-05 00:44:28 -0400321 length = sizeof(source_desc->integer.value);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 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:
Len Brown4be44fc2005-08-05 00:44:28 -0400335 return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 }
337
Len Brown4be44fc2005-08-05 00:44:28 -0400338 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
Bob Mooreb229cf92006-04-21 17:15:00 -0400339 "FieldWrite [FROM]: Obj %p (%s:%X), Buf %p, ByteLen %X\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400340 source_desc,
Bob Moore3371c192009-02-18 14:44:03 +0800341 acpi_ut_get_type_name(source_desc->common.type),
342 source_desc->common.type, buffer, length));
Robert Moore44f6c012005-04-18 22:49:35 -0400343
Len Brown4be44fc2005-08-05 00:44:28 -0400344 ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
Bob Mooreb229cf92006-04-21 17:15:00 -0400345 "FieldWrite [TO]: Obj %p (%s:%X), BitLen %X, BitOff %X, ByteOff %X\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400346 obj_desc,
Bob Moore3371c192009-02-18 14:44:03 +0800347 acpi_ut_get_type_name(obj_desc->common.type),
348 obj_desc->common.type,
Len Brown4be44fc2005-08-05 00:44:28 -0400349 obj_desc->common_field.bit_length,
350 obj_desc->common_field.start_field_bit_offset,
351 obj_desc->common_field.base_byte_offset));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352
353 /* Lock entire transaction if requested */
354
Bob Mooreba886cd2008-04-10 19:06:37 +0400355 acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356
357 /* Write to the field */
358
Len Brown4be44fc2005-08-05 00:44:28 -0400359 status = acpi_ex_insert_into_field(obj_desc, buffer, length);
Bob Mooref02e9fa2008-04-10 19:06:37 +0400360 acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361
Len Brown4be44fc2005-08-05 00:44:28 -0400362 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363}