blob: 6c6104a7a247ef6413ed817ea34c24edfaf96dda [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/******************************************************************************
2 *
3 * Module Name: dsopcode - Dispatcher Op Region support and handling of
4 * "control" opcodes
5 *
6 *****************************************************************************/
7
8/*
Bob Moore6c9deb72007-02-02 19:48:24 +03009 * Copyright (C) 2000 - 2007, R. Byron Moore
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 * All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions, and the following disclaimer,
17 * without modification.
18 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
19 * substantially similar to the "NO WARRANTY" disclaimer below
20 * ("Disclaimer") and any redistribution must be conditioned upon
21 * including a substantially similar Disclaimer requirement for further
22 * binary redistribution.
23 * 3. Neither the names of the above-listed copyright holders nor the names
24 * of any contributors may be used to endorse or promote products derived
25 * from this software without specific prior written permission.
26 *
27 * Alternatively, this software may be distributed under the terms of the
28 * GNU General Public License ("GPL") version 2 as published by the Free
29 * Software Foundation.
30 *
31 * NO WARRANTY
32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
35 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
36 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
41 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
42 * POSSIBILITY OF SUCH DAMAGES.
43 */
44
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <acpi/acpi.h>
46#include <acpi/acparser.h>
47#include <acpi/amlcode.h>
48#include <acpi/acdispat.h>
49#include <acpi/acinterp.h>
50#include <acpi/acnamesp.h>
51#include <acpi/acevents.h>
52
53#define _COMPONENT ACPI_DISPATCHER
Len Brown4be44fc2005-08-05 00:44:28 -040054ACPI_MODULE_NAME("dsopcode")
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
Robert Moore44f6c012005-04-18 22:49:35 -040056/* Local prototypes */
Len Brown4be44fc2005-08-05 00:44:28 -040057static acpi_status
58acpi_ds_execute_arguments(struct acpi_namespace_node *node,
59 struct acpi_namespace_node *scope_node,
60 u32 aml_length, u8 * aml_start);
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
Robert Moore44f6c012005-04-18 22:49:35 -040062static acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -040063acpi_ds_init_buffer_field(u16 aml_opcode,
64 union acpi_operand_object *obj_desc,
65 union acpi_operand_object *buffer_desc,
66 union acpi_operand_object *offset_desc,
67 union acpi_operand_object *length_desc,
68 union acpi_operand_object *result_desc);
Robert Moore44f6c012005-04-18 22:49:35 -040069
70/*******************************************************************************
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 *
72 * FUNCTION: acpi_ds_execute_arguments
73 *
Robert Moore44f6c012005-04-18 22:49:35 -040074 * PARAMETERS: Node - Object NS node
75 * scope_node - Parent NS node
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 * aml_length - Length of executable AML
77 * aml_start - Pointer to the AML
78 *
79 * RETURN: Status.
80 *
81 * DESCRIPTION: Late (deferred) execution of region or field arguments
82 *
Robert Moore44f6c012005-04-18 22:49:35 -040083 ******************************************************************************/
Linus Torvalds1da177e2005-04-16 15:20:36 -070084
Robert Moore44f6c012005-04-18 22:49:35 -040085static acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -040086acpi_ds_execute_arguments(struct acpi_namespace_node *node,
87 struct acpi_namespace_node *scope_node,
88 u32 aml_length, u8 * aml_start)
Linus Torvalds1da177e2005-04-16 15:20:36 -070089{
Len Brown4be44fc2005-08-05 00:44:28 -040090 acpi_status status;
91 union acpi_parse_object *op;
92 struct acpi_walk_state *walk_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
Bob Mooreb229cf92006-04-21 17:15:00 -040094 ACPI_FUNCTION_TRACE(ds_execute_arguments);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
96 /*
97 * Allocate a new parser op to be the root of the parsed tree
98 */
Len Brown4be44fc2005-08-05 00:44:28 -040099 op = acpi_ps_alloc_op(AML_INT_EVAL_SUBTREE_OP);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 if (!op) {
Len Brown4be44fc2005-08-05 00:44:28 -0400101 return_ACPI_STATUS(AE_NO_MEMORY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 }
103
104 /* Save the Node for use in acpi_ps_parse_aml */
105
106 op->common.node = scope_node;
107
108 /* Create and initialize a new parser state */
109
Len Brown4be44fc2005-08-05 00:44:28 -0400110 walk_state = acpi_ds_create_walk_state(0, NULL, NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 if (!walk_state) {
Robert Moore88ac00f2005-05-26 00:00:00 -0400112 status = AE_NO_MEMORY;
113 goto cleanup;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 }
115
Len Brown4be44fc2005-08-05 00:44:28 -0400116 status = acpi_ds_init_aml_walk(walk_state, op, NULL, aml_start,
Bob Mooreec3153f2007-02-02 19:48:21 +0300117 aml_length, NULL, ACPI_IMODE_LOAD_PASS1);
Len Brown4be44fc2005-08-05 00:44:28 -0400118 if (ACPI_FAILURE(status)) {
119 acpi_ds_delete_walk_state(walk_state);
Robert Moore88ac00f2005-05-26 00:00:00 -0400120 goto cleanup;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 }
122
123 /* Mark this parse as a deferred opcode */
124
125 walk_state->parse_flags = ACPI_PARSE_DEFERRED_OP;
126 walk_state->deferred_node = node;
127
128 /* Pass1: Parse the entire declaration */
129
Len Brown4be44fc2005-08-05 00:44:28 -0400130 status = acpi_ps_parse_aml(walk_state);
131 if (ACPI_FAILURE(status)) {
Robert Moore88ac00f2005-05-26 00:00:00 -0400132 goto cleanup;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 }
134
135 /* Get and init the Op created above */
136
137 op->common.node = node;
Len Brown4be44fc2005-08-05 00:44:28 -0400138 acpi_ps_delete_parse_tree(op);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
140 /* Evaluate the deferred arguments */
141
Len Brown4be44fc2005-08-05 00:44:28 -0400142 op = acpi_ps_alloc_op(AML_INT_EVAL_SUBTREE_OP);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 if (!op) {
Len Brown4be44fc2005-08-05 00:44:28 -0400144 return_ACPI_STATUS(AE_NO_MEMORY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 }
146
147 op->common.node = scope_node;
148
149 /* Create and initialize a new parser state */
150
Len Brown4be44fc2005-08-05 00:44:28 -0400151 walk_state = acpi_ds_create_walk_state(0, NULL, NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 if (!walk_state) {
Robert Moore88ac00f2005-05-26 00:00:00 -0400153 status = AE_NO_MEMORY;
154 goto cleanup;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 }
156
157 /* Execute the opcode and arguments */
158
Len Brown4be44fc2005-08-05 00:44:28 -0400159 status = acpi_ds_init_aml_walk(walk_state, op, NULL, aml_start,
Bob Mooreec3153f2007-02-02 19:48:21 +0300160 aml_length, NULL, ACPI_IMODE_EXECUTE);
Len Brown4be44fc2005-08-05 00:44:28 -0400161 if (ACPI_FAILURE(status)) {
162 acpi_ds_delete_walk_state(walk_state);
Robert Moore88ac00f2005-05-26 00:00:00 -0400163 goto cleanup;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 }
165
166 /* Mark this execution as a deferred opcode */
167
168 walk_state->deferred_node = node;
Len Brown4be44fc2005-08-05 00:44:28 -0400169 status = acpi_ps_parse_aml(walk_state);
Robert Moore88ac00f2005-05-26 00:00:00 -0400170
Len Brown4be44fc2005-08-05 00:44:28 -0400171 cleanup:
172 acpi_ps_delete_parse_tree(op);
173 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174}
175
Robert Moore44f6c012005-04-18 22:49:35 -0400176/*******************************************************************************
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 *
178 * FUNCTION: acpi_ds_get_buffer_field_arguments
179 *
180 * PARAMETERS: obj_desc - A valid buffer_field object
181 *
182 * RETURN: Status.
183 *
184 * DESCRIPTION: Get buffer_field Buffer and Index. This implements the late
185 * evaluation of these field attributes.
186 *
Robert Moore44f6c012005-04-18 22:49:35 -0400187 ******************************************************************************/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188
189acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -0400190acpi_ds_get_buffer_field_arguments(union acpi_operand_object *obj_desc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191{
Len Brown4be44fc2005-08-05 00:44:28 -0400192 union acpi_operand_object *extra_desc;
193 struct acpi_namespace_node *node;
194 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
Bob Mooreb229cf92006-04-21 17:15:00 -0400196 ACPI_FUNCTION_TRACE_PTR(ds_get_buffer_field_arguments, obj_desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197
198 if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
Len Brown4be44fc2005-08-05 00:44:28 -0400199 return_ACPI_STATUS(AE_OK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 }
201
202 /* Get the AML pointer (method object) and buffer_field node */
203
Len Brown4be44fc2005-08-05 00:44:28 -0400204 extra_desc = acpi_ns_get_secondary_object(obj_desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 node = obj_desc->buffer_field.node;
206
Len Brown4be44fc2005-08-05 00:44:28 -0400207 ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
208 (ACPI_TYPE_BUFFER_FIELD, node, NULL));
Bob Mooreb229cf92006-04-21 17:15:00 -0400209 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "[%4.4s] BufferField Arg Init\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400210 acpi_ut_get_node_name(node)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211
212 /* Execute the AML code for the term_arg arguments */
213
Len Brown4be44fc2005-08-05 00:44:28 -0400214 status = acpi_ds_execute_arguments(node, acpi_ns_get_parent_node(node),
215 extra_desc->extra.aml_length,
216 extra_desc->extra.aml_start);
217 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218}
219
Robert Moore44f6c012005-04-18 22:49:35 -0400220/*******************************************************************************
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 *
222 * FUNCTION: acpi_ds_get_buffer_arguments
223 *
224 * PARAMETERS: obj_desc - A valid Buffer object
225 *
226 * RETURN: Status.
227 *
228 * DESCRIPTION: Get Buffer length and initializer byte list. This implements
229 * the late evaluation of these attributes.
230 *
Robert Moore44f6c012005-04-18 22:49:35 -0400231 ******************************************************************************/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232
Len Brown4be44fc2005-08-05 00:44:28 -0400233acpi_status acpi_ds_get_buffer_arguments(union acpi_operand_object *obj_desc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234{
Len Brown4be44fc2005-08-05 00:44:28 -0400235 struct acpi_namespace_node *node;
236 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237
Bob Mooreb229cf92006-04-21 17:15:00 -0400238 ACPI_FUNCTION_TRACE_PTR(ds_get_buffer_arguments, obj_desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239
240 if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
Len Brown4be44fc2005-08-05 00:44:28 -0400241 return_ACPI_STATUS(AE_OK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 }
243
244 /* Get the Buffer node */
245
246 node = obj_desc->buffer.node;
247 if (!node) {
Bob Mooreb8e4d892006-01-27 16:43:00 -0500248 ACPI_ERROR((AE_INFO,
249 "No pointer back to NS node in buffer obj %p",
250 obj_desc));
Len Brown4be44fc2005-08-05 00:44:28 -0400251 return_ACPI_STATUS(AE_AML_INTERNAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 }
253
Len Brown4be44fc2005-08-05 00:44:28 -0400254 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Buffer Arg Init\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255
256 /* Execute the AML code for the term_arg arguments */
257
Len Brown4be44fc2005-08-05 00:44:28 -0400258 status = acpi_ds_execute_arguments(node, node,
259 obj_desc->buffer.aml_length,
260 obj_desc->buffer.aml_start);
261 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262}
263
Robert Moore44f6c012005-04-18 22:49:35 -0400264/*******************************************************************************
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 *
266 * FUNCTION: acpi_ds_get_package_arguments
267 *
268 * PARAMETERS: obj_desc - A valid Package object
269 *
270 * RETURN: Status.
271 *
272 * DESCRIPTION: Get Package length and initializer byte list. This implements
273 * the late evaluation of these attributes.
274 *
Robert Moore44f6c012005-04-18 22:49:35 -0400275 ******************************************************************************/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276
Len Brown4be44fc2005-08-05 00:44:28 -0400277acpi_status acpi_ds_get_package_arguments(union acpi_operand_object *obj_desc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278{
Len Brown4be44fc2005-08-05 00:44:28 -0400279 struct acpi_namespace_node *node;
280 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281
Bob Mooreb229cf92006-04-21 17:15:00 -0400282 ACPI_FUNCTION_TRACE_PTR(ds_get_package_arguments, obj_desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283
284 if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
Len Brown4be44fc2005-08-05 00:44:28 -0400285 return_ACPI_STATUS(AE_OK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 }
287
288 /* Get the Package node */
289
290 node = obj_desc->package.node;
291 if (!node) {
Bob Mooreb8e4d892006-01-27 16:43:00 -0500292 ACPI_ERROR((AE_INFO,
293 "No pointer back to NS node in package %p",
294 obj_desc));
Len Brown4be44fc2005-08-05 00:44:28 -0400295 return_ACPI_STATUS(AE_AML_INTERNAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 }
297
Len Brown4be44fc2005-08-05 00:44:28 -0400298 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Package Arg Init\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
300 /* Execute the AML code for the term_arg arguments */
301
Len Brown4be44fc2005-08-05 00:44:28 -0400302 status = acpi_ds_execute_arguments(node, node,
303 obj_desc->package.aml_length,
304 obj_desc->package.aml_start);
305 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306}
307
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308/*****************************************************************************
309 *
310 * FUNCTION: acpi_ds_get_region_arguments
311 *
312 * PARAMETERS: obj_desc - A valid region object
313 *
314 * RETURN: Status.
315 *
316 * DESCRIPTION: Get region address and length. This implements the late
317 * evaluation of these region attributes.
318 *
319 ****************************************************************************/
320
Len Brown4be44fc2005-08-05 00:44:28 -0400321acpi_status acpi_ds_get_region_arguments(union acpi_operand_object *obj_desc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322{
Len Brown4be44fc2005-08-05 00:44:28 -0400323 struct acpi_namespace_node *node;
324 acpi_status status;
325 union acpi_operand_object *extra_desc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
Bob Mooreb229cf92006-04-21 17:15:00 -0400327 ACPI_FUNCTION_TRACE_PTR(ds_get_region_arguments, obj_desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328
329 if (obj_desc->region.flags & AOPOBJ_DATA_VALID) {
Len Brown4be44fc2005-08-05 00:44:28 -0400330 return_ACPI_STATUS(AE_OK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 }
332
Len Brown4be44fc2005-08-05 00:44:28 -0400333 extra_desc = acpi_ns_get_secondary_object(obj_desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 if (!extra_desc) {
Len Brown4be44fc2005-08-05 00:44:28 -0400335 return_ACPI_STATUS(AE_NOT_EXIST);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 }
337
338 /* Get the Region node */
339
340 node = obj_desc->region.node;
341
Len Brown4be44fc2005-08-05 00:44:28 -0400342 ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
343 (ACPI_TYPE_REGION, node, NULL));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344
Bob Mooreb229cf92006-04-21 17:15:00 -0400345 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "[%4.4s] OpRegion Arg Init at AML %p\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400346 acpi_ut_get_node_name(node),
347 extra_desc->extra.aml_start));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348
349 /* Execute the argument AML */
350
Len Brown4be44fc2005-08-05 00:44:28 -0400351 status = acpi_ds_execute_arguments(node, acpi_ns_get_parent_node(node),
352 extra_desc->extra.aml_length,
353 extra_desc->extra.aml_start);
Bob Mooreb229cf92006-04-21 17:15:00 -0400354 if (ACPI_FAILURE(status)) {
355 return_ACPI_STATUS(status);
356 }
357
358 /* Validate the region address/length via the host OS */
359
360 status = acpi_os_validate_address(obj_desc->region.space_id,
361 obj_desc->region.address,
362 (acpi_size) obj_desc->region.length);
363 if (ACPI_FAILURE(status)) {
364 /*
365 * Invalid address/length. We will emit an error message and mark
366 * the region as invalid, so that it will cause an additional error if
367 * it is ever used. Then return AE_OK.
368 */
369 ACPI_EXCEPTION((AE_INFO, status,
370 "During address validation of OpRegion [%4.4s]",
371 node->name.ascii));
372 obj_desc->common.flags |= AOPOBJ_INVALID;
373 status = AE_OK;
374 }
375
Len Brown4be44fc2005-08-05 00:44:28 -0400376 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377}
378
Robert Moore44f6c012005-04-18 22:49:35 -0400379/*******************************************************************************
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 *
381 * FUNCTION: acpi_ds_initialize_region
382 *
Robert Moore44f6c012005-04-18 22:49:35 -0400383 * PARAMETERS: obj_handle - Region namespace node
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 *
385 * RETURN: Status
386 *
387 * DESCRIPTION: Front end to ev_initialize_region
388 *
Robert Moore44f6c012005-04-18 22:49:35 -0400389 ******************************************************************************/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390
Len Brown4be44fc2005-08-05 00:44:28 -0400391acpi_status acpi_ds_initialize_region(acpi_handle obj_handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392{
Len Brown4be44fc2005-08-05 00:44:28 -0400393 union acpi_operand_object *obj_desc;
394 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395
Len Brown4be44fc2005-08-05 00:44:28 -0400396 obj_desc = acpi_ns_get_attached_object(obj_handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397
398 /* Namespace is NOT locked */
399
Len Brown4be44fc2005-08-05 00:44:28 -0400400 status = acpi_ev_initialize_region(obj_desc, FALSE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 return (status);
402}
403
Robert Moore44f6c012005-04-18 22:49:35 -0400404/*******************************************************************************
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 *
406 * FUNCTION: acpi_ds_init_buffer_field
407 *
408 * PARAMETERS: aml_opcode - create_xxx_field
409 * obj_desc - buffer_field object
410 * buffer_desc - Host Buffer
411 * offset_desc - Offset into buffer
Robert Moore44f6c012005-04-18 22:49:35 -0400412 * length_desc - Length of field (CREATE_FIELD_OP only)
413 * result_desc - Where to store the result
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 *
415 * RETURN: Status
416 *
417 * DESCRIPTION: Perform actual initialization of a buffer field
418 *
Robert Moore44f6c012005-04-18 22:49:35 -0400419 ******************************************************************************/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420
Robert Moore44f6c012005-04-18 22:49:35 -0400421static acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -0400422acpi_ds_init_buffer_field(u16 aml_opcode,
423 union acpi_operand_object *obj_desc,
424 union acpi_operand_object *buffer_desc,
425 union acpi_operand_object *offset_desc,
426 union acpi_operand_object *length_desc,
427 union acpi_operand_object *result_desc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428{
Len Brown4be44fc2005-08-05 00:44:28 -0400429 u32 offset;
430 u32 bit_offset;
431 u32 bit_count;
432 u8 field_flags;
433 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434
Bob Mooreb229cf92006-04-21 17:15:00 -0400435 ACPI_FUNCTION_TRACE_PTR(ds_init_buffer_field, obj_desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436
437 /* Host object must be a Buffer */
438
Len Brown4be44fc2005-08-05 00:44:28 -0400439 if (ACPI_GET_OBJECT_TYPE(buffer_desc) != ACPI_TYPE_BUFFER) {
Bob Mooreb8e4d892006-01-27 16:43:00 -0500440 ACPI_ERROR((AE_INFO,
441 "Target of Create Field is not a Buffer object - %s",
442 acpi_ut_get_object_type_name(buffer_desc)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443
444 status = AE_AML_OPERAND_TYPE;
445 goto cleanup;
446 }
447
448 /*
449 * The last parameter to all of these opcodes (result_desc) started
450 * out as a name_string, and should therefore now be a NS node
451 * after resolution in acpi_ex_resolve_operands().
452 */
Len Brown4be44fc2005-08-05 00:44:28 -0400453 if (ACPI_GET_DESCRIPTOR_TYPE(result_desc) != ACPI_DESC_TYPE_NAMED) {
Bob Mooreb8e4d892006-01-27 16:43:00 -0500454 ACPI_ERROR((AE_INFO,
455 "(%s) destination not a NS Node [%s]",
456 acpi_ps_get_opcode_name(aml_opcode),
457 acpi_ut_get_descriptor_name(result_desc)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458
459 status = AE_AML_OPERAND_TYPE;
460 goto cleanup;
461 }
462
463 offset = (u32) offset_desc->integer.value;
464
465 /*
466 * Setup the Bit offsets and counts, according to the opcode
467 */
468 switch (aml_opcode) {
469 case AML_CREATE_FIELD_OP:
470
471 /* Offset is in bits, count is in bits */
472
Robert Moore44f6c012005-04-18 22:49:35 -0400473 field_flags = AML_FIELD_ACCESS_BYTE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 bit_offset = offset;
Len Brown4be44fc2005-08-05 00:44:28 -0400475 bit_count = (u32) length_desc->integer.value;
Robert Moore44f6c012005-04-18 22:49:35 -0400476
477 /* Must have a valid (>0) bit count */
478
479 if (bit_count == 0) {
Bob Mooreb8e4d892006-01-27 16:43:00 -0500480 ACPI_ERROR((AE_INFO,
Bob Mooreb229cf92006-04-21 17:15:00 -0400481 "Attempt to CreateField of length zero"));
Robert Moore44f6c012005-04-18 22:49:35 -0400482 status = AE_AML_OPERAND_VALUE;
483 goto cleanup;
484 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 break;
486
487 case AML_CREATE_BIT_FIELD_OP:
488
489 /* Offset is in bits, Field is one bit */
490
491 bit_offset = offset;
Len Brown4be44fc2005-08-05 00:44:28 -0400492 bit_count = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 field_flags = AML_FIELD_ACCESS_BYTE;
494 break;
495
496 case AML_CREATE_BYTE_FIELD_OP:
497
498 /* Offset is in bytes, field is one byte */
499
500 bit_offset = 8 * offset;
Len Brown4be44fc2005-08-05 00:44:28 -0400501 bit_count = 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 field_flags = AML_FIELD_ACCESS_BYTE;
503 break;
504
505 case AML_CREATE_WORD_FIELD_OP:
506
507 /* Offset is in bytes, field is one word */
508
509 bit_offset = 8 * offset;
Len Brown4be44fc2005-08-05 00:44:28 -0400510 bit_count = 16;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 field_flags = AML_FIELD_ACCESS_WORD;
512 break;
513
514 case AML_CREATE_DWORD_FIELD_OP:
515
516 /* Offset is in bytes, field is one dword */
517
518 bit_offset = 8 * offset;
Len Brown4be44fc2005-08-05 00:44:28 -0400519 bit_count = 32;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 field_flags = AML_FIELD_ACCESS_DWORD;
521 break;
522
523 case AML_CREATE_QWORD_FIELD_OP:
524
525 /* Offset is in bytes, field is one qword */
526
527 bit_offset = 8 * offset;
Len Brown4be44fc2005-08-05 00:44:28 -0400528 bit_count = 64;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 field_flags = AML_FIELD_ACCESS_QWORD;
530 break;
531
532 default:
533
Bob Mooreb8e4d892006-01-27 16:43:00 -0500534 ACPI_ERROR((AE_INFO,
535 "Unknown field creation opcode %02x", aml_opcode));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 status = AE_AML_BAD_OPCODE;
537 goto cleanup;
538 }
539
540 /* Entire field must fit within the current length of the buffer */
541
Len Brown4be44fc2005-08-05 00:44:28 -0400542 if ((bit_offset + bit_count) > (8 * (u32) buffer_desc->buffer.length)) {
Bob Mooreb8e4d892006-01-27 16:43:00 -0500543 ACPI_ERROR((AE_INFO,
544 "Field [%4.4s] at %d exceeds Buffer [%4.4s] size %d (bits)",
545 acpi_ut_get_node_name(result_desc),
546 bit_offset + bit_count,
547 acpi_ut_get_node_name(buffer_desc->buffer.node),
548 8 * (u32) buffer_desc->buffer.length));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 status = AE_AML_BUFFER_LIMIT;
550 goto cleanup;
551 }
552
553 /*
554 * Initialize areas of the field object that are common to all fields
Robert Moore44f6c012005-04-18 22:49:35 -0400555 * For field_flags, use LOCK_RULE = 0 (NO_LOCK),
556 * UPDATE_RULE = 0 (UPDATE_PRESERVE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 */
Len Brown4be44fc2005-08-05 00:44:28 -0400558 status = acpi_ex_prep_common_field_object(obj_desc, field_flags, 0,
559 bit_offset, bit_count);
560 if (ACPI_FAILURE(status)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 goto cleanup;
562 }
563
564 obj_desc->buffer_field.buffer_obj = buffer_desc;
565
566 /* Reference count for buffer_desc inherits obj_desc count */
567
Robert Moore44f6c012005-04-18 22:49:35 -0400568 buffer_desc->common.reference_count = (u16)
Len Brown4be44fc2005-08-05 00:44:28 -0400569 (buffer_desc->common.reference_count +
570 obj_desc->common.reference_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571
Len Brown4be44fc2005-08-05 00:44:28 -0400572 cleanup:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573
574 /* Always delete the operands */
575
Len Brown4be44fc2005-08-05 00:44:28 -0400576 acpi_ut_remove_reference(offset_desc);
577 acpi_ut_remove_reference(buffer_desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578
579 if (aml_opcode == AML_CREATE_FIELD_OP) {
Len Brown4be44fc2005-08-05 00:44:28 -0400580 acpi_ut_remove_reference(length_desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 }
582
583 /* On failure, delete the result descriptor */
584
Len Brown4be44fc2005-08-05 00:44:28 -0400585 if (ACPI_FAILURE(status)) {
586 acpi_ut_remove_reference(result_desc); /* Result descriptor */
587 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 /* Now the address and length are valid for this buffer_field */
589
590 obj_desc->buffer_field.flags |= AOPOBJ_DATA_VALID;
591 }
592
Len Brown4be44fc2005-08-05 00:44:28 -0400593 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594}
595
Robert Moore44f6c012005-04-18 22:49:35 -0400596/*******************************************************************************
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 *
598 * FUNCTION: acpi_ds_eval_buffer_field_operands
599 *
600 * PARAMETERS: walk_state - Current walk
601 * Op - A valid buffer_field Op object
602 *
603 * RETURN: Status
604 *
605 * DESCRIPTION: Get buffer_field Buffer and Index
606 * Called from acpi_ds_exec_end_op during buffer_field parse tree walk
607 *
Robert Moore44f6c012005-04-18 22:49:35 -0400608 ******************************************************************************/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609
610acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -0400611acpi_ds_eval_buffer_field_operands(struct acpi_walk_state *walk_state,
612 union acpi_parse_object *op)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613{
Len Brown4be44fc2005-08-05 00:44:28 -0400614 acpi_status status;
615 union acpi_operand_object *obj_desc;
616 struct acpi_namespace_node *node;
617 union acpi_parse_object *next_op;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618
Bob Mooreb229cf92006-04-21 17:15:00 -0400619 ACPI_FUNCTION_TRACE_PTR(ds_eval_buffer_field_operands, op);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620
621 /*
622 * This is where we evaluate the address and length fields of the
623 * create_xxx_field declaration
624 */
Len Brown4be44fc2005-08-05 00:44:28 -0400625 node = op->common.node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626
627 /* next_op points to the op that holds the Buffer */
628
629 next_op = op->common.value.arg;
630
631 /* Evaluate/create the address and length operands */
632
Len Brown4be44fc2005-08-05 00:44:28 -0400633 status = acpi_ds_create_operands(walk_state, next_op);
634 if (ACPI_FAILURE(status)) {
635 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 }
637
Len Brown4be44fc2005-08-05 00:44:28 -0400638 obj_desc = acpi_ns_get_attached_object(node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 if (!obj_desc) {
Len Brown4be44fc2005-08-05 00:44:28 -0400640 return_ACPI_STATUS(AE_NOT_EXIST);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 }
642
643 /* Resolve the operands */
644
Len Brown4be44fc2005-08-05 00:44:28 -0400645 status = acpi_ex_resolve_operands(op->common.aml_opcode,
646 ACPI_WALK_OPERANDS, walk_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647
Len Brown4be44fc2005-08-05 00:44:28 -0400648 ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE,
649 acpi_ps_get_opcode_name(op->common.aml_opcode),
650 walk_state->num_operands,
Bob Mooreb229cf92006-04-21 17:15:00 -0400651 "after AcpiExResolveOperands");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652
Len Brown4be44fc2005-08-05 00:44:28 -0400653 if (ACPI_FAILURE(status)) {
Bob Mooreb8e4d892006-01-27 16:43:00 -0500654 ACPI_ERROR((AE_INFO, "(%s) bad operand(s) (%X)",
655 acpi_ps_get_opcode_name(op->common.aml_opcode),
656 status));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657
Len Brown4be44fc2005-08-05 00:44:28 -0400658 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 }
660
661 /* Initialize the Buffer Field */
662
663 if (op->common.aml_opcode == AML_CREATE_FIELD_OP) {
Bob Moore52fc0b02006-10-02 00:00:00 -0400664
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 /* NOTE: Slightly different operands for this opcode */
666
Len Brown4be44fc2005-08-05 00:44:28 -0400667 status =
668 acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
669 walk_state->operands[0],
670 walk_state->operands[1],
671 walk_state->operands[2],
672 walk_state->operands[3]);
673 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 /* All other, create_xxx_field opcodes */
675
Len Brown4be44fc2005-08-05 00:44:28 -0400676 status =
677 acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
678 walk_state->operands[0],
679 walk_state->operands[1], NULL,
680 walk_state->operands[2]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 }
682
Len Brown4be44fc2005-08-05 00:44:28 -0400683 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684}
685
Robert Moore44f6c012005-04-18 22:49:35 -0400686/*******************************************************************************
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 *
688 * FUNCTION: acpi_ds_eval_region_operands
689 *
690 * PARAMETERS: walk_state - Current walk
691 * Op - A valid region Op object
692 *
693 * RETURN: Status
694 *
695 * DESCRIPTION: Get region address and length
696 * Called from acpi_ds_exec_end_op during op_region parse tree walk
697 *
Robert Moore44f6c012005-04-18 22:49:35 -0400698 ******************************************************************************/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699
700acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -0400701acpi_ds_eval_region_operands(struct acpi_walk_state *walk_state,
702 union acpi_parse_object *op)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703{
Len Brown4be44fc2005-08-05 00:44:28 -0400704 acpi_status status;
705 union acpi_operand_object *obj_desc;
706 union acpi_operand_object *operand_desc;
707 struct acpi_namespace_node *node;
708 union acpi_parse_object *next_op;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709
Bob Mooreb229cf92006-04-21 17:15:00 -0400710 ACPI_FUNCTION_TRACE_PTR(ds_eval_region_operands, op);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711
712 /*
Robert Moore44f6c012005-04-18 22:49:35 -0400713 * This is where we evaluate the address and length fields of the
714 * op_region declaration
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 */
Len Brown4be44fc2005-08-05 00:44:28 -0400716 node = op->common.node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717
718 /* next_op points to the op that holds the space_iD */
719
720 next_op = op->common.value.arg;
721
722 /* next_op points to address op */
723
724 next_op = next_op->common.next;
725
726 /* Evaluate/create the address and length operands */
727
Len Brown4be44fc2005-08-05 00:44:28 -0400728 status = acpi_ds_create_operands(walk_state, next_op);
729 if (ACPI_FAILURE(status)) {
730 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 }
732
733 /* Resolve the length and address operands to numbers */
734
Len Brown4be44fc2005-08-05 00:44:28 -0400735 status = acpi_ex_resolve_operands(op->common.aml_opcode,
736 ACPI_WALK_OPERANDS, walk_state);
737 if (ACPI_FAILURE(status)) {
738 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 }
740
Len Brown4be44fc2005-08-05 00:44:28 -0400741 ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE,
742 acpi_ps_get_opcode_name(op->common.aml_opcode),
Bob Mooreb229cf92006-04-21 17:15:00 -0400743 1, "after AcpiExResolveOperands");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744
Len Brown4be44fc2005-08-05 00:44:28 -0400745 obj_desc = acpi_ns_get_attached_object(node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 if (!obj_desc) {
Len Brown4be44fc2005-08-05 00:44:28 -0400747 return_ACPI_STATUS(AE_NOT_EXIST);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748 }
749
750 /*
751 * Get the length operand and save it
752 * (at Top of stack)
753 */
754 operand_desc = walk_state->operands[walk_state->num_operands - 1];
755
756 obj_desc->region.length = (u32) operand_desc->integer.value;
Len Brown4be44fc2005-08-05 00:44:28 -0400757 acpi_ut_remove_reference(operand_desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758
759 /*
760 * Get the address and save it
761 * (at top of stack - 1)
762 */
763 operand_desc = walk_state->operands[walk_state->num_operands - 2];
764
Robert Moore44f6c012005-04-18 22:49:35 -0400765 obj_desc->region.address = (acpi_physical_address)
Len Brown4be44fc2005-08-05 00:44:28 -0400766 operand_desc->integer.value;
767 acpi_ut_remove_reference(operand_desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768
Bob Mooreb229cf92006-04-21 17:15:00 -0400769 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "RgnObj %p Addr %8.8X%8.8X Len %X\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400770 obj_desc,
771 ACPI_FORMAT_UINT64(obj_desc->region.address),
772 obj_desc->region.length));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773
774 /* Now the address and length are valid for this opregion */
775
776 obj_desc->region.flags |= AOPOBJ_DATA_VALID;
777
Len Brown4be44fc2005-08-05 00:44:28 -0400778 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779}
780
Robert Moore44f6c012005-04-18 22:49:35 -0400781/*******************************************************************************
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 *
783 * FUNCTION: acpi_ds_eval_data_object_operands
784 *
785 * PARAMETERS: walk_state - Current walk
786 * Op - A valid data_object Op object
787 * obj_desc - data_object
788 *
789 * RETURN: Status
790 *
791 * DESCRIPTION: Get the operands and complete the following data object types:
792 * Buffer, Package.
793 *
Robert Moore44f6c012005-04-18 22:49:35 -0400794 ******************************************************************************/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795
796acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -0400797acpi_ds_eval_data_object_operands(struct acpi_walk_state *walk_state,
798 union acpi_parse_object *op,
799 union acpi_operand_object *obj_desc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800{
Len Brown4be44fc2005-08-05 00:44:28 -0400801 acpi_status status;
802 union acpi_operand_object *arg_desc;
803 u32 length;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804
Bob Mooreb229cf92006-04-21 17:15:00 -0400805 ACPI_FUNCTION_TRACE(ds_eval_data_object_operands);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806
807 /* The first operand (for all of these data objects) is the length */
808
Len Brown4be44fc2005-08-05 00:44:28 -0400809 status = acpi_ds_create_operand(walk_state, op->common.value.arg, 1);
810 if (ACPI_FAILURE(status)) {
811 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 }
813
Len Brown4be44fc2005-08-05 00:44:28 -0400814 status = acpi_ex_resolve_operands(walk_state->opcode,
815 &(walk_state->
816 operands[walk_state->num_operands -
817 1]), walk_state);
818 if (ACPI_FAILURE(status)) {
819 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820 }
821
822 /* Extract length operand */
823
Len Brown4be44fc2005-08-05 00:44:28 -0400824 arg_desc = walk_state->operands[walk_state->num_operands - 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825 length = (u32) arg_desc->integer.value;
826
827 /* Cleanup for length operand */
828
Len Brown4be44fc2005-08-05 00:44:28 -0400829 status = acpi_ds_obj_stack_pop(1, walk_state);
830 if (ACPI_FAILURE(status)) {
831 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 }
833
Len Brown4be44fc2005-08-05 00:44:28 -0400834 acpi_ut_remove_reference(arg_desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835
836 /*
837 * Create the actual data object
838 */
839 switch (op->common.aml_opcode) {
840 case AML_BUFFER_OP:
841
Len Brown4be44fc2005-08-05 00:44:28 -0400842 status =
843 acpi_ds_build_internal_buffer_obj(walk_state, op, length,
844 &obj_desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845 break;
846
847 case AML_PACKAGE_OP:
848 case AML_VAR_PACKAGE_OP:
849
Len Brown4be44fc2005-08-05 00:44:28 -0400850 status =
851 acpi_ds_build_internal_package_obj(walk_state, op, length,
852 &obj_desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853 break;
854
855 default:
Len Brown4be44fc2005-08-05 00:44:28 -0400856 return_ACPI_STATUS(AE_AML_BAD_OPCODE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857 }
858
Len Brown4be44fc2005-08-05 00:44:28 -0400859 if (ACPI_SUCCESS(status)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 /*
Robert Moore44f6c012005-04-18 22:49:35 -0400861 * Return the object in the walk_state, unless the parent is a package -
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862 * in this case, the return object will be stored in the parse tree
863 * for the package.
864 */
865 if ((!op->common.parent) ||
Len Brown4be44fc2005-08-05 00:44:28 -0400866 ((op->common.parent->common.aml_opcode != AML_PACKAGE_OP) &&
867 (op->common.parent->common.aml_opcode !=
868 AML_VAR_PACKAGE_OP)
869 && (op->common.parent->common.aml_opcode !=
870 AML_NAME_OP))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 walk_state->result_obj = obj_desc;
872 }
873 }
874
Len Brown4be44fc2005-08-05 00:44:28 -0400875 return_ACPI_STATUS(status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876}
877
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878/*******************************************************************************
879 *
880 * FUNCTION: acpi_ds_exec_begin_control_op
881 *
882 * PARAMETERS: walk_list - The list that owns the walk stack
883 * Op - The control Op
884 *
885 * RETURN: Status
886 *
887 * DESCRIPTION: Handles all control ops encountered during control method
888 * execution.
889 *
890 ******************************************************************************/
891
892acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -0400893acpi_ds_exec_begin_control_op(struct acpi_walk_state *walk_state,
894 union acpi_parse_object *op)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895{
Len Brown4be44fc2005-08-05 00:44:28 -0400896 acpi_status status = AE_OK;
897 union acpi_generic_state *control_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898
Bob Mooreb229cf92006-04-21 17:15:00 -0400899 ACPI_FUNCTION_NAME(ds_exec_begin_control_op);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900
Len Brown4be44fc2005-08-05 00:44:28 -0400901 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p Opcode=%2.2X State=%p\n", op,
902 op->common.aml_opcode, walk_state));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903
904 switch (op->common.aml_opcode) {
905 case AML_IF_OP:
906 case AML_WHILE_OP:
907
908 /*
909 * IF/WHILE: Create a new control state to manage these
910 * constructs. We need to manage these as a stack, in order
911 * to handle nesting.
912 */
Len Brown4be44fc2005-08-05 00:44:28 -0400913 control_state = acpi_ut_create_control_state();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914 if (!control_state) {
915 status = AE_NO_MEMORY;
916 break;
917 }
918 /*
919 * Save a pointer to the predicate for multiple executions
920 * of a loop
921 */
Len Brown4be44fc2005-08-05 00:44:28 -0400922 control_state->control.aml_predicate_start =
923 walk_state->parser_state.aml - 1;
924 control_state->control.package_end =
925 walk_state->parser_state.pkg_end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 control_state->control.opcode = op->common.aml_opcode;
927
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928 /* Push the control state on this walk's control stack */
929
Len Brown4be44fc2005-08-05 00:44:28 -0400930 acpi_ut_push_generic_state(&walk_state->control_state,
931 control_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 break;
933
934 case AML_ELSE_OP:
935
936 /* Predicate is in the state object */
937 /* If predicate is true, the IF was executed, ignore ELSE part */
938
939 if (walk_state->last_predicate) {
940 status = AE_CTRL_TRUE;
941 }
942
943 break;
944
945 case AML_RETURN_OP:
946
947 break;
948
949 default:
950 break;
951 }
952
953 return (status);
954}
955
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956/*******************************************************************************
957 *
958 * FUNCTION: acpi_ds_exec_end_control_op
959 *
960 * PARAMETERS: walk_list - The list that owns the walk stack
961 * Op - The control Op
962 *
963 * RETURN: Status
964 *
965 * DESCRIPTION: Handles all control ops encountered during control method
966 * execution.
967 *
968 ******************************************************************************/
969
970acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -0400971acpi_ds_exec_end_control_op(struct acpi_walk_state * walk_state,
972 union acpi_parse_object * op)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973{
Len Brown4be44fc2005-08-05 00:44:28 -0400974 acpi_status status = AE_OK;
975 union acpi_generic_state *control_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976
Bob Mooreb229cf92006-04-21 17:15:00 -0400977 ACPI_FUNCTION_NAME(ds_exec_end_control_op);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978
979 switch (op->common.aml_opcode) {
980 case AML_IF_OP:
981
Len Brown4be44fc2005-08-05 00:44:28 -0400982 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[IF_OP] Op=%p\n", op));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983
984 /*
985 * Save the result of the predicate in case there is an
986 * ELSE to come
987 */
988 walk_state->last_predicate =
Len Brown4be44fc2005-08-05 00:44:28 -0400989 (u8) walk_state->control_state->common.value;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990
991 /*
992 * Pop the control state that was created at the start
993 * of the IF and free it
994 */
Len Brown4be44fc2005-08-05 00:44:28 -0400995 control_state =
996 acpi_ut_pop_generic_state(&walk_state->control_state);
997 acpi_ut_delete_generic_state(control_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998 break;
999
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000 case AML_ELSE_OP:
1001
1002 break;
1003
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004 case AML_WHILE_OP:
1005
Len Brown4be44fc2005-08-05 00:44:28 -04001006 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[WHILE_OP] Op=%p\n", op));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007
1008 if (walk_state->control_state->common.value) {
Bob Moore52fc0b02006-10-02 00:00:00 -04001009
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010 /* Predicate was true, go back and evaluate it again! */
1011
1012 status = AE_CTRL_PENDING;
1013 }
1014
Len Brown4be44fc2005-08-05 00:44:28 -04001015 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1016 "[WHILE_OP] termination! Op=%p\n", op));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017
1018 /* Pop this control state and free it */
1019
Len Brown4be44fc2005-08-05 00:44:28 -04001020 control_state =
1021 acpi_ut_pop_generic_state(&walk_state->control_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022
Len Brown4be44fc2005-08-05 00:44:28 -04001023 walk_state->aml_last_while =
1024 control_state->control.aml_predicate_start;
1025 acpi_ut_delete_generic_state(control_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026 break;
1027
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028 case AML_RETURN_OP:
1029
Len Brown4be44fc2005-08-05 00:44:28 -04001030 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
1031 "[RETURN_OP] Op=%p Arg=%p\n", op,
1032 op->common.value.arg));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033
1034 /*
1035 * One optional operand -- the return value
1036 * It can be either an immediate operand or a result that
1037 * has been bubbled up the tree
1038 */
1039 if (op->common.value.arg) {
Bob Moore52fc0b02006-10-02 00:00:00 -04001040
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041 /* Since we have a real Return(), delete any implicit return */
1042
Len Brown4be44fc2005-08-05 00:44:28 -04001043 acpi_ds_clear_implicit_return(walk_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044
1045 /* Return statement has an immediate operand */
1046
Len Brown4be44fc2005-08-05 00:44:28 -04001047 status =
1048 acpi_ds_create_operands(walk_state,
1049 op->common.value.arg);
1050 if (ACPI_FAILURE(status)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051 return (status);
1052 }
1053
1054 /*
1055 * If value being returned is a Reference (such as
1056 * an arg or local), resolve it now because it may
1057 * cease to exist at the end of the method.
1058 */
Len Brown4be44fc2005-08-05 00:44:28 -04001059 status =
1060 acpi_ex_resolve_to_value(&walk_state->operands[0],
1061 walk_state);
1062 if (ACPI_FAILURE(status)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 return (status);
1064 }
1065
1066 /*
1067 * Get the return value and save as the last result
1068 * value. This is the only place where walk_state->return_desc
1069 * is set to anything other than zero!
1070 */
1071 walk_state->return_desc = walk_state->operands[0];
Len Brown4be44fc2005-08-05 00:44:28 -04001072 } else if ((walk_state->results) &&
1073 (walk_state->results->results.num_results > 0)) {
Bob Moore52fc0b02006-10-02 00:00:00 -04001074
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075 /* Since we have a real Return(), delete any implicit return */
1076
Len Brown4be44fc2005-08-05 00:44:28 -04001077 acpi_ds_clear_implicit_return(walk_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078
1079 /*
1080 * The return value has come from a previous calculation.
1081 *
1082 * If value being returned is a Reference (such as
1083 * an arg or local), resolve it now because it may
1084 * cease to exist at the end of the method.
1085 *
1086 * Allow references created by the Index operator to return unchanged.
1087 */
Len Brown4be44fc2005-08-05 00:44:28 -04001088 if ((ACPI_GET_DESCRIPTOR_TYPE
1089 (walk_state->results->results.obj_desc[0]) ==
1090 ACPI_DESC_TYPE_OPERAND)
1091 &&
1092 (ACPI_GET_OBJECT_TYPE
1093 (walk_state->results->results.obj_desc[0]) ==
1094 ACPI_TYPE_LOCAL_REFERENCE)
1095 && ((walk_state->results->results.obj_desc[0])->
1096 reference.opcode != AML_INDEX_OP)) {
1097 status =
1098 acpi_ex_resolve_to_value(&walk_state->
1099 results->results.
1100 obj_desc[0],
1101 walk_state);
1102 if (ACPI_FAILURE(status)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103 return (status);
1104 }
1105 }
1106
Len Brown4be44fc2005-08-05 00:44:28 -04001107 walk_state->return_desc =
1108 walk_state->results->results.obj_desc[0];
1109 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110 /* No return operand */
1111
1112 if (walk_state->num_operands) {
Len Brown4be44fc2005-08-05 00:44:28 -04001113 acpi_ut_remove_reference(walk_state->
1114 operands[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115 }
1116
Len Brown4be44fc2005-08-05 00:44:28 -04001117 walk_state->operands[0] = NULL;
1118 walk_state->num_operands = 0;
1119 walk_state->return_desc = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120 }
1121
Len Brown4be44fc2005-08-05 00:44:28 -04001122 ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
Bob Mooreb229cf92006-04-21 17:15:00 -04001123 "Completed RETURN_OP State=%p, RetVal=%p\n",
Len Brown4be44fc2005-08-05 00:44:28 -04001124 walk_state, walk_state->return_desc));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125
1126 /* End the control method execution right now */
1127
1128 status = AE_CTRL_TERMINATE;
1129 break;
1130
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131 case AML_NOOP_OP:
1132
1133 /* Just do nothing! */
1134 break;
1135
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136 case AML_BREAK_POINT_OP:
1137
1138 /* Call up to the OS service layer to handle this */
1139
Len Brown4be44fc2005-08-05 00:44:28 -04001140 status =
1141 acpi_os_signal(ACPI_SIGNAL_BREAKPOINT,
1142 "Executed AML Breakpoint opcode");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143
1144 /* If and when it returns, all done. */
1145
1146 break;
1147
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148 case AML_BREAK_OP:
Len Brown4be44fc2005-08-05 00:44:28 -04001149 case AML_CONTINUE_OP: /* ACPI 2.0 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150
1151 /* Pop and delete control states until we find a while */
1152
1153 while (walk_state->control_state &&
Len Brown4be44fc2005-08-05 00:44:28 -04001154 (walk_state->control_state->control.opcode !=
1155 AML_WHILE_OP)) {
1156 control_state =
1157 acpi_ut_pop_generic_state(&walk_state->
1158 control_state);
1159 acpi_ut_delete_generic_state(control_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160 }
1161
1162 /* No while found? */
1163
1164 if (!walk_state->control_state) {
1165 return (AE_AML_NO_WHILE);
1166 }
1167
1168 /* Was: walk_state->aml_last_while = walk_state->control_state->Control.aml_predicate_start; */
1169
Len Brown4be44fc2005-08-05 00:44:28 -04001170 walk_state->aml_last_while =
1171 walk_state->control_state->control.package_end;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172
1173 /* Return status depending on opcode */
1174
1175 if (op->common.aml_opcode == AML_BREAK_OP) {
1176 status = AE_CTRL_BREAK;
Len Brown4be44fc2005-08-05 00:44:28 -04001177 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178 status = AE_CTRL_CONTINUE;
1179 }
1180 break;
1181
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182 default:
1183
Bob Mooreb8e4d892006-01-27 16:43:00 -05001184 ACPI_ERROR((AE_INFO, "Unknown control opcode=%X Op=%p",
1185 op->common.aml_opcode, op));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186
1187 status = AE_AML_BAD_OPCODE;
1188 break;
1189 }
1190
1191 return (status);
1192}