Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /******************************************************************************* |
| 2 | * |
| 3 | * Module Name: dsutils - Dispatcher utilities |
| 4 | * |
| 5 | ******************************************************************************/ |
| 6 | |
| 7 | /* |
| 8 | * Copyright (C) 2000 - 2005, R. Byron Moore |
| 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #include <acpi/acpi.h> |
| 45 | #include <acpi/acparser.h> |
| 46 | #include <acpi/amlcode.h> |
| 47 | #include <acpi/acdispat.h> |
| 48 | #include <acpi/acinterp.h> |
| 49 | #include <acpi/acnamesp.h> |
| 50 | #include <acpi/acdebug.h> |
| 51 | |
| 52 | #define _COMPONENT ACPI_DISPATCHER |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 53 | ACPI_MODULE_NAME("dsutils") |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | |
| 55 | /******************************************************************************* |
| 56 | * |
| 57 | * FUNCTION: acpi_ds_clear_implicit_return |
| 58 | * |
| 59 | * PARAMETERS: walk_state - Current State |
| 60 | * |
| 61 | * RETURN: None. |
| 62 | * |
| 63 | * DESCRIPTION: Clear and remove a reference on an implicit return value. Used |
| 64 | * to delete "stale" return values (if enabled, the return value |
| 65 | * from every operator is saved at least momentarily, in case the |
| 66 | * parent method exits.) |
| 67 | * |
| 68 | ******************************************************************************/ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 69 | void acpi_ds_clear_implicit_return(struct acpi_walk_state *walk_state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 71 | ACPI_FUNCTION_NAME("ds_clear_implicit_return"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | |
| 73 | /* |
| 74 | * Slack must be enabled for this feature |
| 75 | */ |
| 76 | if (!acpi_gbl_enable_interpreter_slack) { |
| 77 | return; |
| 78 | } |
| 79 | |
| 80 | if (walk_state->implicit_return_obj) { |
| 81 | /* |
| 82 | * Delete any "stale" implicit return. However, in |
| 83 | * complex statements, the implicit return value can be |
| 84 | * bubbled up several levels. |
| 85 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 86 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
| 87 | "Removing reference on stale implicit return obj %p\n", |
| 88 | walk_state->implicit_return_obj)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 90 | acpi_ut_remove_reference(walk_state->implicit_return_obj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | walk_state->implicit_return_obj = NULL; |
| 92 | } |
| 93 | } |
| 94 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | #ifndef ACPI_NO_METHOD_EXECUTION |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | /******************************************************************************* |
| 97 | * |
| 98 | * FUNCTION: acpi_ds_do_implicit_return |
| 99 | * |
| 100 | * PARAMETERS: return_desc - The return value |
| 101 | * walk_state - Current State |
| 102 | * add_reference - True if a reference should be added to the |
| 103 | * return object |
| 104 | * |
| 105 | * RETURN: TRUE if implicit return enabled, FALSE otherwise |
| 106 | * |
| 107 | * DESCRIPTION: Implements the optional "implicit return". We save the result |
| 108 | * of every ASL operator and control method invocation in case the |
| 109 | * parent method exit. Before storing a new return value, we |
| 110 | * delete the previous return value. |
| 111 | * |
| 112 | ******************************************************************************/ |
| 113 | |
| 114 | u8 |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 115 | acpi_ds_do_implicit_return(union acpi_operand_object *return_desc, |
| 116 | struct acpi_walk_state *walk_state, u8 add_reference) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 118 | ACPI_FUNCTION_NAME("ds_do_implicit_return"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | |
| 120 | /* |
| 121 | * Slack must be enabled for this feature, and we must |
| 122 | * have a valid return object |
| 123 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 124 | if ((!acpi_gbl_enable_interpreter_slack) || (!return_desc)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | return (FALSE); |
| 126 | } |
| 127 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 128 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
| 129 | "Result %p will be implicitly returned; Prev=%p\n", |
| 130 | return_desc, walk_state->implicit_return_obj)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | |
| 132 | /* |
| 133 | * Delete any "stale" implicit return value first. However, in |
| 134 | * complex statements, the implicit return value can be |
| 135 | * bubbled up several levels, so we don't clear the value if it |
| 136 | * is the same as the return_desc. |
| 137 | */ |
| 138 | if (walk_state->implicit_return_obj) { |
| 139 | if (walk_state->implicit_return_obj == return_desc) { |
| 140 | return (TRUE); |
| 141 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 142 | acpi_ds_clear_implicit_return(walk_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | } |
| 144 | |
| 145 | /* Save the implicit return value, add a reference if requested */ |
| 146 | |
| 147 | walk_state->implicit_return_obj = return_desc; |
| 148 | if (add_reference) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 149 | acpi_ut_add_reference(return_desc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | } |
| 151 | |
| 152 | return (TRUE); |
| 153 | } |
| 154 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | /******************************************************************************* |
| 156 | * |
| 157 | * FUNCTION: acpi_ds_is_result_used |
| 158 | * |
| 159 | * PARAMETERS: Op - Current Op |
| 160 | * walk_state - Current State |
| 161 | * |
| 162 | * RETURN: TRUE if result is used, FALSE otherwise |
| 163 | * |
| 164 | * DESCRIPTION: Check if a result object will be used by the parent |
| 165 | * |
| 166 | ******************************************************************************/ |
| 167 | |
| 168 | u8 |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 169 | acpi_ds_is_result_used(union acpi_parse_object * op, |
| 170 | struct acpi_walk_state * walk_state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 172 | const struct acpi_opcode_info *parent_info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 174 | ACPI_FUNCTION_TRACE_PTR("ds_is_result_used", op); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | |
| 176 | /* Must have both an Op and a Result Object */ |
| 177 | |
| 178 | if (!op) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 179 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Null Op\n")); |
| 180 | return_VALUE(TRUE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | } |
| 182 | |
| 183 | /* |
| 184 | * We know that this operator is not a |
| 185 | * Return() operator (would not come here.) The following code is the |
| 186 | * optional support for a so-called "implicit return". Some AML code |
| 187 | * assumes that the last value of the method is "implicitly" returned |
| 188 | * to the caller. Just save the last result as the return value. |
| 189 | * NOTE: this is optional because the ASL language does not actually |
| 190 | * support this behavior. |
| 191 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 192 | (void)acpi_ds_do_implicit_return(walk_state->result_obj, walk_state, |
| 193 | TRUE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | |
| 195 | /* |
| 196 | * Now determine if the parent will use the result |
| 197 | * |
| 198 | * If there is no parent, or the parent is a scope_op, we are executing |
| 199 | * at the method level. An executing method typically has no parent, |
| 200 | * since each method is parsed separately. A method invoked externally |
| 201 | * via execute_control_method has a scope_op as the parent. |
| 202 | */ |
| 203 | if ((!op->common.parent) || |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 204 | (op->common.parent->common.aml_opcode == AML_SCOPE_OP)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | /* No parent, the return value cannot possibly be used */ |
| 206 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 207 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
| 208 | "At Method level, result of [%s] not used\n", |
| 209 | acpi_ps_get_opcode_name(op->common. |
| 210 | aml_opcode))); |
| 211 | return_VALUE(FALSE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | } |
| 213 | |
| 214 | /* Get info on the parent. The root_op is AML_SCOPE */ |
| 215 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 216 | parent_info = |
| 217 | acpi_ps_get_opcode_info(op->common.parent->common.aml_opcode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | if (parent_info->class == AML_CLASS_UNKNOWN) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 219 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
| 220 | "Unknown parent opcode. Op=%p\n", op)); |
| 221 | return_VALUE(FALSE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | } |
| 223 | |
| 224 | /* |
| 225 | * Decide what to do with the result based on the parent. If |
| 226 | * the parent opcode will not use the result, delete the object. |
| 227 | * Otherwise leave it as is, it will be deleted when it is used |
| 228 | * as an operand later. |
| 229 | */ |
| 230 | switch (parent_info->class) { |
| 231 | case AML_CLASS_CONTROL: |
| 232 | |
| 233 | switch (op->common.parent->common.aml_opcode) { |
| 234 | case AML_RETURN_OP: |
| 235 | |
| 236 | /* Never delete the return value associated with a return opcode */ |
| 237 | |
| 238 | goto result_used; |
| 239 | |
| 240 | case AML_IF_OP: |
| 241 | case AML_WHILE_OP: |
| 242 | |
| 243 | /* |
| 244 | * If we are executing the predicate AND this is the predicate op, |
| 245 | * we will use the return value |
| 246 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 247 | if ((walk_state->control_state->common.state == |
| 248 | ACPI_CONTROL_PREDICATE_EXECUTING) |
| 249 | && (walk_state->control_state->control. |
| 250 | predicate_op == op)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | goto result_used; |
| 252 | } |
| 253 | break; |
| 254 | |
| 255 | default: |
| 256 | /* Ignore other control opcodes */ |
| 257 | break; |
| 258 | } |
| 259 | |
| 260 | /* The general control opcode returns no result */ |
| 261 | |
| 262 | goto result_not_used; |
| 263 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | case AML_CLASS_CREATE: |
| 265 | |
| 266 | /* |
| 267 | * These opcodes allow term_arg(s) as operands and therefore |
| 268 | * the operands can be method calls. The result is used. |
| 269 | */ |
| 270 | goto result_used; |
| 271 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | case AML_CLASS_NAMED_OBJECT: |
| 273 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 274 | if ((op->common.parent->common.aml_opcode == AML_REGION_OP) || |
| 275 | (op->common.parent->common.aml_opcode == AML_DATA_REGION_OP) |
| 276 | || (op->common.parent->common.aml_opcode == AML_PACKAGE_OP) |
| 277 | || (op->common.parent->common.aml_opcode == |
| 278 | AML_VAR_PACKAGE_OP) |
| 279 | || (op->common.parent->common.aml_opcode == AML_BUFFER_OP) |
| 280 | || (op->common.parent->common.aml_opcode == |
| 281 | AML_INT_EVAL_SUBTREE_OP)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | /* |
| 283 | * These opcodes allow term_arg(s) as operands and therefore |
| 284 | * the operands can be method calls. The result is used. |
| 285 | */ |
| 286 | goto result_used; |
| 287 | } |
| 288 | |
| 289 | goto result_not_used; |
| 290 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | default: |
| 292 | |
| 293 | /* |
| 294 | * In all other cases. the parent will actually use the return |
| 295 | * object, so keep it. |
| 296 | */ |
| 297 | goto result_used; |
| 298 | } |
| 299 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 300 | result_used: |
| 301 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
| 302 | "Result of [%s] used by Parent [%s] Op=%p\n", |
| 303 | acpi_ps_get_opcode_name(op->common.aml_opcode), |
| 304 | acpi_ps_get_opcode_name(op->common.parent->common. |
| 305 | aml_opcode), op)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 307 | return_VALUE(TRUE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 309 | result_not_used: |
| 310 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
| 311 | "Result of [%s] not used by Parent [%s] Op=%p\n", |
| 312 | acpi_ps_get_opcode_name(op->common.aml_opcode), |
| 313 | acpi_ps_get_opcode_name(op->common.parent->common. |
| 314 | aml_opcode), op)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 316 | return_VALUE(FALSE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | } |
| 318 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | /******************************************************************************* |
| 320 | * |
| 321 | * FUNCTION: acpi_ds_delete_result_if_not_used |
| 322 | * |
| 323 | * PARAMETERS: Op - Current parse Op |
| 324 | * result_obj - Result of the operation |
| 325 | * walk_state - Current state |
| 326 | * |
| 327 | * RETURN: Status |
| 328 | * |
| 329 | * DESCRIPTION: Used after interpretation of an opcode. If there is an internal |
| 330 | * result descriptor, check if the parent opcode will actually use |
| 331 | * this result. If not, delete the result now so that it will |
| 332 | * not become orphaned. |
| 333 | * |
| 334 | ******************************************************************************/ |
| 335 | |
| 336 | void |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 337 | acpi_ds_delete_result_if_not_used(union acpi_parse_object *op, |
| 338 | union acpi_operand_object *result_obj, |
| 339 | struct acpi_walk_state *walk_state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 341 | union acpi_operand_object *obj_desc; |
| 342 | acpi_status status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 344 | ACPI_FUNCTION_TRACE_PTR("ds_delete_result_if_not_used", result_obj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | |
| 346 | if (!op) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 347 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Null Op\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | return_VOID; |
| 349 | } |
| 350 | |
| 351 | if (!result_obj) { |
| 352 | return_VOID; |
| 353 | } |
| 354 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 355 | if (!acpi_ds_is_result_used(op, walk_state)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | /* Must pop the result stack (obj_desc should be equal to result_obj) */ |
| 357 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 358 | status = acpi_ds_result_pop(&obj_desc, walk_state); |
| 359 | if (ACPI_SUCCESS(status)) { |
| 360 | acpi_ut_remove_reference(result_obj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | } |
| 362 | } |
| 363 | |
| 364 | return_VOID; |
| 365 | } |
| 366 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | /******************************************************************************* |
| 368 | * |
| 369 | * FUNCTION: acpi_ds_resolve_operands |
| 370 | * |
| 371 | * PARAMETERS: walk_state - Current walk state with operands on stack |
| 372 | * |
| 373 | * RETURN: Status |
| 374 | * |
| 375 | * DESCRIPTION: Resolve all operands to their values. Used to prepare |
| 376 | * arguments to a control method invocation (a call from one |
| 377 | * method to another.) |
| 378 | * |
| 379 | ******************************************************************************/ |
| 380 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 381 | acpi_status acpi_ds_resolve_operands(struct acpi_walk_state *walk_state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 383 | u32 i; |
| 384 | acpi_status status = AE_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 386 | ACPI_FUNCTION_TRACE_PTR("ds_resolve_operands", walk_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | |
| 388 | /* |
| 389 | * Attempt to resolve each of the valid operands |
| 390 | * Method arguments are passed by reference, not by value. This means |
| 391 | * that the actual objects are passed, not copies of the objects. |
| 392 | */ |
| 393 | for (i = 0; i < walk_state->num_operands; i++) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 394 | status = |
| 395 | acpi_ex_resolve_to_value(&walk_state->operands[i], |
| 396 | walk_state); |
| 397 | if (ACPI_FAILURE(status)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | break; |
| 399 | } |
| 400 | } |
| 401 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 402 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | } |
| 404 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | /******************************************************************************* |
| 406 | * |
| 407 | * FUNCTION: acpi_ds_clear_operands |
| 408 | * |
| 409 | * PARAMETERS: walk_state - Current walk state with operands on stack |
| 410 | * |
| 411 | * RETURN: None |
| 412 | * |
| 413 | * DESCRIPTION: Clear all operands on the current walk state operand stack. |
| 414 | * |
| 415 | ******************************************************************************/ |
| 416 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 417 | void acpi_ds_clear_operands(struct acpi_walk_state *walk_state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 419 | u32 i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 421 | ACPI_FUNCTION_TRACE_PTR("ds_clear_operands", walk_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | |
| 423 | /* Remove a reference on each operand on the stack */ |
| 424 | |
| 425 | for (i = 0; i < walk_state->num_operands; i++) { |
| 426 | /* |
| 427 | * Remove a reference to all operands, including both |
| 428 | * "Arguments" and "Targets". |
| 429 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 430 | acpi_ut_remove_reference(walk_state->operands[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | walk_state->operands[i] = NULL; |
| 432 | } |
| 433 | |
| 434 | walk_state->num_operands = 0; |
| 435 | return_VOID; |
| 436 | } |
| 437 | #endif |
| 438 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | /******************************************************************************* |
| 440 | * |
| 441 | * FUNCTION: acpi_ds_create_operand |
| 442 | * |
| 443 | * PARAMETERS: walk_state - Current walk state |
| 444 | * Arg - Parse object for the argument |
| 445 | * arg_index - Which argument (zero based) |
| 446 | * |
| 447 | * RETURN: Status |
| 448 | * |
| 449 | * DESCRIPTION: Translate a parse tree object that is an argument to an AML |
| 450 | * opcode to the equivalent interpreter object. This may include |
| 451 | * looking up a name or entering a new name into the internal |
| 452 | * namespace. |
| 453 | * |
| 454 | ******************************************************************************/ |
| 455 | |
| 456 | acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 457 | acpi_ds_create_operand(struct acpi_walk_state *walk_state, |
| 458 | union acpi_parse_object *arg, u32 arg_index) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 460 | acpi_status status = AE_OK; |
| 461 | char *name_string; |
| 462 | u32 name_length; |
| 463 | union acpi_operand_object *obj_desc; |
| 464 | union acpi_parse_object *parent_op; |
| 465 | u16 opcode; |
| 466 | acpi_interpreter_mode interpreter_mode; |
| 467 | const struct acpi_opcode_info *op_info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 469 | ACPI_FUNCTION_TRACE_PTR("ds_create_operand", arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | |
| 471 | /* A valid name must be looked up in the namespace */ |
| 472 | |
| 473 | if ((arg->common.aml_opcode == AML_INT_NAMEPATH_OP) && |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 474 | (arg->common.value.string)) { |
| 475 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Getting a name: Arg=%p\n", |
| 476 | arg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | |
| 478 | /* Get the entire name string from the AML stream */ |
| 479 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 480 | status = |
| 481 | acpi_ex_get_name_string(ACPI_TYPE_ANY, |
| 482 | arg->common.value.buffer, |
| 483 | &name_string, &name_length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 485 | if (ACPI_FAILURE(status)) { |
| 486 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | } |
| 488 | |
| 489 | /* All prefixes have been handled, and the name is in name_string */ |
| 490 | |
| 491 | /* |
| 492 | * Special handling for buffer_field declarations. This is a deferred |
| 493 | * opcode that unfortunately defines the field name as the last |
| 494 | * parameter instead of the first. We get here when we are performing |
| 495 | * the deferred execution, so the actual name of the field is already |
| 496 | * in the namespace. We don't want to attempt to look it up again |
| 497 | * because we may be executing in a different scope than where the |
| 498 | * actual opcode exists. |
| 499 | */ |
| 500 | if ((walk_state->deferred_node) && |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 501 | (walk_state->deferred_node->type == ACPI_TYPE_BUFFER_FIELD) |
| 502 | && (arg_index != 0)) { |
| 503 | obj_desc = |
| 504 | ACPI_CAST_PTR(union acpi_operand_object, |
| 505 | walk_state->deferred_node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | status = AE_OK; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 507 | } else { /* All other opcodes */ |
| 508 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | /* |
| 510 | * Differentiate between a namespace "create" operation |
| 511 | * versus a "lookup" operation (IMODE_LOAD_PASS2 vs. |
| 512 | * IMODE_EXECUTE) in order to support the creation of |
| 513 | * namespace objects during the execution of control methods. |
| 514 | */ |
| 515 | parent_op = arg->common.parent; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 516 | op_info = |
| 517 | acpi_ps_get_opcode_info(parent_op->common. |
| 518 | aml_opcode); |
| 519 | if ((op_info->flags & AML_NSNODE) |
| 520 | && (parent_op->common.aml_opcode != |
| 521 | AML_INT_METHODCALL_OP) |
| 522 | && (parent_op->common.aml_opcode != AML_REGION_OP) |
| 523 | && (parent_op->common.aml_opcode != |
| 524 | AML_INT_NAMEPATH_OP)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | /* Enter name into namespace if not found */ |
| 526 | |
| 527 | interpreter_mode = ACPI_IMODE_LOAD_PASS2; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 528 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | /* Return a failure if name not found */ |
| 530 | |
| 531 | interpreter_mode = ACPI_IMODE_EXECUTE; |
| 532 | } |
| 533 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 534 | status = |
| 535 | acpi_ns_lookup(walk_state->scope_info, name_string, |
| 536 | ACPI_TYPE_ANY, interpreter_mode, |
| 537 | ACPI_NS_SEARCH_PARENT | |
| 538 | ACPI_NS_DONT_OPEN_SCOPE, walk_state, |
| 539 | ACPI_CAST_INDIRECT_PTR(struct |
| 540 | acpi_namespace_node, |
| 541 | &obj_desc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | /* |
| 543 | * The only case where we pass through (ignore) a NOT_FOUND |
| 544 | * error is for the cond_ref_of opcode. |
| 545 | */ |
| 546 | if (status == AE_NOT_FOUND) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 547 | if (parent_op->common.aml_opcode == |
| 548 | AML_COND_REF_OF_OP) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | /* |
| 550 | * For the Conditional Reference op, it's OK if |
| 551 | * the name is not found; We just need a way to |
| 552 | * indicate this to the interpreter, set the |
| 553 | * object to the root |
| 554 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 555 | obj_desc = |
| 556 | ACPI_CAST_PTR(union |
| 557 | acpi_operand_object, |
| 558 | acpi_gbl_root_node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | status = AE_OK; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 560 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | /* |
| 562 | * We just plain didn't find it -- which is a |
| 563 | * very serious error at this point |
| 564 | */ |
| 565 | status = AE_AML_NAME_NOT_FOUND; |
| 566 | } |
| 567 | } |
| 568 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 569 | if (ACPI_FAILURE(status)) { |
| 570 | ACPI_REPORT_NSERROR(name_string, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | } |
| 572 | } |
| 573 | |
| 574 | /* Free the namestring created above */ |
| 575 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 576 | ACPI_MEM_FREE(name_string); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | |
| 578 | /* Check status from the lookup */ |
| 579 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 580 | if (ACPI_FAILURE(status)) { |
| 581 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | } |
| 583 | |
| 584 | /* Put the resulting object onto the current object stack */ |
| 585 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 586 | status = acpi_ds_obj_stack_push(obj_desc, walk_state); |
| 587 | if (ACPI_FAILURE(status)) { |
| 588 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 590 | ACPI_DEBUGGER_EXEC(acpi_db_display_argument_object |
| 591 | (obj_desc, walk_state)); |
| 592 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | /* Check for null name case */ |
| 594 | |
| 595 | if (arg->common.aml_opcode == AML_INT_NAMEPATH_OP) { |
| 596 | /* |
| 597 | * If the name is null, this means that this is an |
| 598 | * optional result parameter that was not specified |
| 599 | * in the original ASL. Create a Zero Constant for a |
| 600 | * placeholder. (Store to a constant is a Noop.) |
| 601 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 602 | opcode = AML_ZERO_OP; /* Has no arguments! */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 604 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
| 605 | "Null namepath: Arg=%p\n", arg)); |
| 606 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | opcode = arg->common.aml_opcode; |
| 608 | } |
| 609 | |
| 610 | /* Get the object type of the argument */ |
| 611 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 612 | op_info = acpi_ps_get_opcode_info(opcode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | if (op_info->object_type == ACPI_TYPE_INVALID) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 614 | return_ACPI_STATUS(AE_NOT_IMPLEMENTED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | } |
| 616 | |
| 617 | if (op_info->flags & AML_HAS_RETVAL) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 618 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
| 619 | "Argument previously created, already stacked \n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 621 | ACPI_DEBUGGER_EXEC(acpi_db_display_argument_object |
| 622 | (walk_state-> |
| 623 | operands[walk_state->num_operands - |
| 624 | 1], walk_state)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | |
| 626 | /* |
| 627 | * Use value that was already previously returned |
| 628 | * by the evaluation of this argument |
| 629 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 630 | status = |
| 631 | acpi_ds_result_pop_from_bottom(&obj_desc, |
| 632 | walk_state); |
| 633 | if (ACPI_FAILURE(status)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | /* |
| 635 | * Only error is underflow, and this indicates |
| 636 | * a missing or null operand! |
| 637 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 638 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
| 639 | "Missing or null operand, %s\n", |
| 640 | acpi_format_exception |
| 641 | (status))); |
| 642 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 644 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | /* Create an ACPI_INTERNAL_OBJECT for the argument */ |
| 646 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 647 | obj_desc = |
| 648 | acpi_ut_create_internal_object(op_info-> |
| 649 | object_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | if (!obj_desc) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 651 | return_ACPI_STATUS(AE_NO_MEMORY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | } |
| 653 | |
| 654 | /* Initialize the new object */ |
| 655 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 656 | status = |
| 657 | acpi_ds_init_object_from_op(walk_state, arg, opcode, |
| 658 | &obj_desc); |
| 659 | if (ACPI_FAILURE(status)) { |
| 660 | acpi_ut_delete_object_desc(obj_desc); |
| 661 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | } |
| 663 | } |
| 664 | |
| 665 | /* Put the operand object on the object stack */ |
| 666 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 667 | status = acpi_ds_obj_stack_push(obj_desc, walk_state); |
| 668 | if (ACPI_FAILURE(status)) { |
| 669 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | } |
| 671 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 672 | ACPI_DEBUGGER_EXEC(acpi_db_display_argument_object |
| 673 | (obj_desc, walk_state)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | } |
| 675 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 676 | return_ACPI_STATUS(AE_OK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | } |
| 678 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | /******************************************************************************* |
| 680 | * |
| 681 | * FUNCTION: acpi_ds_create_operands |
| 682 | * |
| 683 | * PARAMETERS: walk_state - Current state |
| 684 | * first_arg - First argument of a parser argument tree |
| 685 | * |
| 686 | * RETURN: Status |
| 687 | * |
| 688 | * DESCRIPTION: Convert an operator's arguments from a parse tree format to |
| 689 | * namespace objects and place those argument object on the object |
| 690 | * stack in preparation for evaluation by the interpreter. |
| 691 | * |
| 692 | ******************************************************************************/ |
| 693 | |
| 694 | acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 695 | acpi_ds_create_operands(struct acpi_walk_state *walk_state, |
| 696 | union acpi_parse_object *first_arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 698 | acpi_status status = AE_OK; |
| 699 | union acpi_parse_object *arg; |
| 700 | u32 arg_count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 702 | ACPI_FUNCTION_TRACE_PTR("ds_create_operands", first_arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | |
| 704 | /* For all arguments in the list... */ |
| 705 | |
| 706 | arg = first_arg; |
| 707 | while (arg) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 708 | status = acpi_ds_create_operand(walk_state, arg, arg_count); |
| 709 | if (ACPI_FAILURE(status)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | goto cleanup; |
| 711 | } |
| 712 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 713 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
| 714 | "Arg #%d (%p) done, Arg1=%p\n", arg_count, |
| 715 | arg, first_arg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | |
| 717 | /* Move on to next argument, if any */ |
| 718 | |
| 719 | arg = arg->common.next; |
| 720 | arg_count++; |
| 721 | } |
| 722 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 723 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 725 | cleanup: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | /* |
| 727 | * We must undo everything done above; meaning that we must |
| 728 | * pop everything off of the operand stack and delete those |
| 729 | * objects |
| 730 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 731 | (void)acpi_ds_obj_stack_pop_and_delete(arg_count, walk_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame^] | 733 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "While creating Arg %d - %s\n", |
| 734 | (arg_count + 1), acpi_format_exception(status))); |
| 735 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | } |