Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /******************************************************************************* |
| 2 | * |
| 3 | * Module Name: dsutils - Dispatcher utilities |
| 4 | * |
| 5 | ******************************************************************************/ |
| 6 | |
| 7 | /* |
Bob Moore | 4a90c7e | 2006-01-13 16:22:00 -0500 | [diff] [blame] | 8 | * Copyright (C) 2000 - 2006, R. Byron Moore |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | { |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -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 | { |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -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 | |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -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) { |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 179 | ACPI_ERROR((AE_INFO, "Null Op")); |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 180 | return_UINT8(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)) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 205 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | /* No parent, the return value cannot possibly be used */ |
| 207 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 208 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
| 209 | "At Method level, result of [%s] not used\n", |
| 210 | acpi_ps_get_opcode_name(op->common. |
| 211 | aml_opcode))); |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 212 | return_UINT8(FALSE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | } |
| 214 | |
| 215 | /* Get info on the parent. The root_op is AML_SCOPE */ |
| 216 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 217 | parent_info = |
| 218 | acpi_ps_get_opcode_info(op->common.parent->common.aml_opcode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | if (parent_info->class == AML_CLASS_UNKNOWN) { |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 220 | ACPI_ERROR((AE_INFO, "Unknown parent opcode Op=%p", op)); |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 221 | return_UINT8(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 | |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 307 | return_UINT8(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 | |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 316 | return_UINT8(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 | |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -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) { |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 347 | ACPI_ERROR((AE_INFO, "Null Op")); |
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)) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 356 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | /* Must pop the result stack (obj_desc should be equal to result_obj) */ |
| 358 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 359 | status = acpi_ds_result_pop(&obj_desc, walk_state); |
| 360 | if (ACPI_SUCCESS(status)) { |
| 361 | acpi_ut_remove_reference(result_obj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | } |
| 363 | } |
| 364 | |
| 365 | return_VOID; |
| 366 | } |
| 367 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | /******************************************************************************* |
| 369 | * |
| 370 | * FUNCTION: acpi_ds_resolve_operands |
| 371 | * |
| 372 | * PARAMETERS: walk_state - Current walk state with operands on stack |
| 373 | * |
| 374 | * RETURN: Status |
| 375 | * |
| 376 | * DESCRIPTION: Resolve all operands to their values. Used to prepare |
| 377 | * arguments to a control method invocation (a call from one |
| 378 | * method to another.) |
| 379 | * |
| 380 | ******************************************************************************/ |
| 381 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 382 | acpi_status acpi_ds_resolve_operands(struct acpi_walk_state *walk_state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 384 | u32 i; |
| 385 | acpi_status status = AE_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 387 | ACPI_FUNCTION_TRACE_PTR(ds_resolve_operands, walk_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | |
| 389 | /* |
| 390 | * Attempt to resolve each of the valid operands |
| 391 | * Method arguments are passed by reference, not by value. This means |
| 392 | * that the actual objects are passed, not copies of the objects. |
| 393 | */ |
| 394 | for (i = 0; i < walk_state->num_operands; i++) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 395 | status = |
| 396 | acpi_ex_resolve_to_value(&walk_state->operands[i], |
| 397 | walk_state); |
| 398 | if (ACPI_FAILURE(status)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | break; |
| 400 | } |
| 401 | } |
| 402 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 403 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | } |
| 405 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | /******************************************************************************* |
| 407 | * |
| 408 | * FUNCTION: acpi_ds_clear_operands |
| 409 | * |
| 410 | * PARAMETERS: walk_state - Current walk state with operands on stack |
| 411 | * |
| 412 | * RETURN: None |
| 413 | * |
| 414 | * DESCRIPTION: Clear all operands on the current walk state operand stack. |
| 415 | * |
| 416 | ******************************************************************************/ |
| 417 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 418 | void acpi_ds_clear_operands(struct acpi_walk_state *walk_state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 420 | u32 i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 422 | ACPI_FUNCTION_TRACE_PTR(ds_clear_operands, walk_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | |
| 424 | /* Remove a reference on each operand on the stack */ |
| 425 | |
| 426 | for (i = 0; i < walk_state->num_operands; i++) { |
| 427 | /* |
| 428 | * Remove a reference to all operands, including both |
| 429 | * "Arguments" and "Targets". |
| 430 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 431 | acpi_ut_remove_reference(walk_state->operands[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | walk_state->operands[i] = NULL; |
| 433 | } |
| 434 | |
| 435 | walk_state->num_operands = 0; |
| 436 | return_VOID; |
| 437 | } |
| 438 | #endif |
| 439 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | /******************************************************************************* |
| 441 | * |
| 442 | * FUNCTION: acpi_ds_create_operand |
| 443 | * |
| 444 | * PARAMETERS: walk_state - Current walk state |
| 445 | * Arg - Parse object for the argument |
| 446 | * arg_index - Which argument (zero based) |
| 447 | * |
| 448 | * RETURN: Status |
| 449 | * |
| 450 | * DESCRIPTION: Translate a parse tree object that is an argument to an AML |
| 451 | * opcode to the equivalent interpreter object. This may include |
| 452 | * looking up a name or entering a new name into the internal |
| 453 | * namespace. |
| 454 | * |
| 455 | ******************************************************************************/ |
| 456 | |
| 457 | acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 458 | acpi_ds_create_operand(struct acpi_walk_state *walk_state, |
| 459 | union acpi_parse_object *arg, u32 arg_index) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 461 | acpi_status status = AE_OK; |
| 462 | char *name_string; |
| 463 | u32 name_length; |
| 464 | union acpi_operand_object *obj_desc; |
| 465 | union acpi_parse_object *parent_op; |
| 466 | u16 opcode; |
| 467 | acpi_interpreter_mode interpreter_mode; |
| 468 | const struct acpi_opcode_info *op_info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 470 | ACPI_FUNCTION_TRACE_PTR(ds_create_operand, arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | |
| 472 | /* A valid name must be looked up in the namespace */ |
| 473 | |
| 474 | if ((arg->common.aml_opcode == AML_INT_NAMEPATH_OP) && |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 475 | (arg->common.value.string)) { |
| 476 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Getting a name: Arg=%p\n", |
| 477 | arg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | |
| 479 | /* Get the entire name string from the AML stream */ |
| 480 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 481 | status = |
| 482 | acpi_ex_get_name_string(ACPI_TYPE_ANY, |
| 483 | arg->common.value.buffer, |
| 484 | &name_string, &name_length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 486 | if (ACPI_FAILURE(status)) { |
| 487 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | } |
| 489 | |
| 490 | /* All prefixes have been handled, and the name is in name_string */ |
| 491 | |
| 492 | /* |
| 493 | * Special handling for buffer_field declarations. This is a deferred |
| 494 | * opcode that unfortunately defines the field name as the last |
| 495 | * parameter instead of the first. We get here when we are performing |
| 496 | * the deferred execution, so the actual name of the field is already |
| 497 | * in the namespace. We don't want to attempt to look it up again |
| 498 | * because we may be executing in a different scope than where the |
| 499 | * actual opcode exists. |
| 500 | */ |
| 501 | if ((walk_state->deferred_node) && |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 502 | (walk_state->deferred_node->type == ACPI_TYPE_BUFFER_FIELD) |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 503 | && (arg_index == |
| 504 | (u32) ((walk_state->opcode == |
| 505 | AML_CREATE_FIELD_OP) ? 3 : 2))) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 506 | obj_desc = |
| 507 | ACPI_CAST_PTR(union acpi_operand_object, |
| 508 | walk_state->deferred_node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | status = AE_OK; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 510 | } else { /* All other opcodes */ |
| 511 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | /* |
| 513 | * Differentiate between a namespace "create" operation |
| 514 | * versus a "lookup" operation (IMODE_LOAD_PASS2 vs. |
| 515 | * IMODE_EXECUTE) in order to support the creation of |
| 516 | * namespace objects during the execution of control methods. |
| 517 | */ |
| 518 | parent_op = arg->common.parent; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 519 | op_info = |
| 520 | acpi_ps_get_opcode_info(parent_op->common. |
| 521 | aml_opcode); |
| 522 | if ((op_info->flags & AML_NSNODE) |
| 523 | && (parent_op->common.aml_opcode != |
| 524 | AML_INT_METHODCALL_OP) |
| 525 | && (parent_op->common.aml_opcode != AML_REGION_OP) |
| 526 | && (parent_op->common.aml_opcode != |
| 527 | AML_INT_NAMEPATH_OP)) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 528 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | /* Enter name into namespace if not found */ |
| 530 | |
| 531 | interpreter_mode = ACPI_IMODE_LOAD_PASS2; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 532 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | /* Return a failure if name not found */ |
| 534 | |
| 535 | interpreter_mode = ACPI_IMODE_EXECUTE; |
| 536 | } |
| 537 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 538 | status = |
| 539 | acpi_ns_lookup(walk_state->scope_info, name_string, |
| 540 | ACPI_TYPE_ANY, interpreter_mode, |
| 541 | ACPI_NS_SEARCH_PARENT | |
| 542 | ACPI_NS_DONT_OPEN_SCOPE, walk_state, |
| 543 | ACPI_CAST_INDIRECT_PTR(struct |
| 544 | acpi_namespace_node, |
| 545 | &obj_desc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | /* |
| 547 | * The only case where we pass through (ignore) a NOT_FOUND |
| 548 | * error is for the cond_ref_of opcode. |
| 549 | */ |
| 550 | if (status == AE_NOT_FOUND) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 551 | if (parent_op->common.aml_opcode == |
| 552 | AML_COND_REF_OF_OP) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | /* |
| 554 | * For the Conditional Reference op, it's OK if |
| 555 | * the name is not found; We just need a way to |
| 556 | * indicate this to the interpreter, set the |
| 557 | * object to the root |
| 558 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 559 | obj_desc = |
| 560 | ACPI_CAST_PTR(union |
| 561 | acpi_operand_object, |
| 562 | acpi_gbl_root_node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | status = AE_OK; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 564 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | /* |
| 566 | * We just plain didn't find it -- which is a |
| 567 | * very serious error at this point |
| 568 | */ |
| 569 | status = AE_AML_NAME_NOT_FOUND; |
| 570 | } |
| 571 | } |
| 572 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 573 | if (ACPI_FAILURE(status)) { |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 574 | ACPI_ERROR_NAMESPACE(name_string, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | } |
| 576 | } |
| 577 | |
| 578 | /* Free the namestring created above */ |
| 579 | |
Bob Moore | 8313524 | 2006-10-03 00:00:00 -0400 | [diff] [blame] | 580 | ACPI_FREE(name_string); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | |
| 582 | /* Check status from the lookup */ |
| 583 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 584 | if (ACPI_FAILURE(status)) { |
| 585 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | } |
| 587 | |
| 588 | /* Put the resulting object onto the current object stack */ |
| 589 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 590 | status = acpi_ds_obj_stack_push(obj_desc, walk_state); |
| 591 | if (ACPI_FAILURE(status)) { |
| 592 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 594 | ACPI_DEBUGGER_EXEC(acpi_db_display_argument_object |
| 595 | (obj_desc, walk_state)); |
| 596 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | /* Check for null name case */ |
| 598 | |
| 599 | if (arg->common.aml_opcode == AML_INT_NAMEPATH_OP) { |
| 600 | /* |
| 601 | * If the name is null, this means that this is an |
| 602 | * optional result parameter that was not specified |
| 603 | * in the original ASL. Create a Zero Constant for a |
| 604 | * placeholder. (Store to a constant is a Noop.) |
| 605 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 606 | opcode = AML_ZERO_OP; /* Has no arguments! */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 608 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
| 609 | "Null namepath: Arg=%p\n", arg)); |
| 610 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | opcode = arg->common.aml_opcode; |
| 612 | } |
| 613 | |
| 614 | /* Get the object type of the argument */ |
| 615 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 616 | op_info = acpi_ps_get_opcode_info(opcode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | if (op_info->object_type == ACPI_TYPE_INVALID) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 618 | return_ACPI_STATUS(AE_NOT_IMPLEMENTED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | } |
| 620 | |
| 621 | if (op_info->flags & AML_HAS_RETVAL) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 622 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 623 | "Argument previously created, already stacked\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 625 | ACPI_DEBUGGER_EXEC(acpi_db_display_argument_object |
| 626 | (walk_state-> |
| 627 | operands[walk_state->num_operands - |
| 628 | 1], walk_state)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | |
| 630 | /* |
| 631 | * Use value that was already previously returned |
| 632 | * by the evaluation of this argument |
| 633 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 634 | status = |
| 635 | acpi_ds_result_pop_from_bottom(&obj_desc, |
| 636 | walk_state); |
| 637 | if (ACPI_FAILURE(status)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | /* |
| 639 | * Only error is underflow, and this indicates |
| 640 | * a missing or null operand! |
| 641 | */ |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 642 | ACPI_EXCEPTION((AE_INFO, status, |
| 643 | "Missing or null operand")); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 644 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 646 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | /* Create an ACPI_INTERNAL_OBJECT for the argument */ |
| 648 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 649 | obj_desc = |
| 650 | acpi_ut_create_internal_object(op_info-> |
| 651 | object_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | if (!obj_desc) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 653 | return_ACPI_STATUS(AE_NO_MEMORY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | } |
| 655 | |
| 656 | /* Initialize the new object */ |
| 657 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 658 | status = |
| 659 | acpi_ds_init_object_from_op(walk_state, arg, opcode, |
| 660 | &obj_desc); |
| 661 | if (ACPI_FAILURE(status)) { |
| 662 | acpi_ut_delete_object_desc(obj_desc); |
| 663 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | } |
| 665 | } |
| 666 | |
| 667 | /* Put the operand object on the object stack */ |
| 668 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 669 | status = acpi_ds_obj_stack_push(obj_desc, walk_state); |
| 670 | if (ACPI_FAILURE(status)) { |
| 671 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | } |
| 673 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 674 | ACPI_DEBUGGER_EXEC(acpi_db_display_argument_object |
| 675 | (obj_desc, walk_state)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | } |
| 677 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 678 | return_ACPI_STATUS(AE_OK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | } |
| 680 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | /******************************************************************************* |
| 682 | * |
| 683 | * FUNCTION: acpi_ds_create_operands |
| 684 | * |
| 685 | * PARAMETERS: walk_state - Current state |
| 686 | * first_arg - First argument of a parser argument tree |
| 687 | * |
| 688 | * RETURN: Status |
| 689 | * |
| 690 | * DESCRIPTION: Convert an operator's arguments from a parse tree format to |
| 691 | * namespace objects and place those argument object on the object |
| 692 | * stack in preparation for evaluation by the interpreter. |
| 693 | * |
| 694 | ******************************************************************************/ |
| 695 | |
| 696 | acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 697 | acpi_ds_create_operands(struct acpi_walk_state *walk_state, |
| 698 | union acpi_parse_object *first_arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 700 | acpi_status status = AE_OK; |
| 701 | union acpi_parse_object *arg; |
| 702 | u32 arg_count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 704 | ACPI_FUNCTION_TRACE_PTR(ds_create_operands, first_arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | |
| 706 | /* For all arguments in the list... */ |
| 707 | |
| 708 | arg = first_arg; |
| 709 | while (arg) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 710 | status = acpi_ds_create_operand(walk_state, arg, arg_count); |
| 711 | if (ACPI_FAILURE(status)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | goto cleanup; |
| 713 | } |
| 714 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 715 | ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
| 716 | "Arg #%d (%p) done, Arg1=%p\n", arg_count, |
| 717 | arg, first_arg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | |
| 719 | /* Move on to next argument, if any */ |
| 720 | |
| 721 | arg = arg->common.next; |
| 722 | arg_count++; |
| 723 | } |
| 724 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 725 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 727 | cleanup: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | /* |
| 729 | * We must undo everything done above; meaning that we must |
| 730 | * pop everything off of the operand stack and delete those |
| 731 | * objects |
| 732 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 733 | (void)acpi_ds_obj_stack_pop_and_delete(arg_count, walk_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 735 | ACPI_EXCEPTION((AE_INFO, status, "While creating Arg %d", |
| 736 | (arg_count + 1))); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 737 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | } |