Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /****************************************************************************** |
| 2 | * |
| 3 | * Module Name: psparse - Parser top level AML parse routines |
| 4 | * |
| 5 | *****************************************************************************/ |
| 6 | |
| 7 | /* |
Bob Moore | 25f044e | 2013-01-25 05:38:56 +0000 | [diff] [blame] | 8 | * Copyright (C) 2000 - 2013, Intel Corp. |
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 | /* |
| 45 | * Parse the AML and build an operation tree as most interpreters, |
Bob Moore | 73a3090 | 2012-10-31 02:26:55 +0000 | [diff] [blame] | 46 | * like Perl, do. Parsing is done by hand rather than with a YACC |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | * generated parser to tightly constrain stack and dynamic memory |
Bob Moore | 73a3090 | 2012-10-31 02:26:55 +0000 | [diff] [blame] | 48 | * usage. At the same time, parsing is kept flexible and the code |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | * fairly compact by parsing based on a list of AML opcode |
| 50 | * templates in aml_op_info[] |
| 51 | */ |
| 52 | |
| 53 | #include <acpi/acpi.h> |
Len Brown | e2f7a77 | 2009-01-09 00:30:03 -0500 | [diff] [blame] | 54 | #include "accommon.h" |
| 55 | #include "acparser.h" |
| 56 | #include "acdispat.h" |
| 57 | #include "amlcode.h" |
Len Brown | e2f7a77 | 2009-01-09 00:30:03 -0500 | [diff] [blame] | 58 | #include "acinterp.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
| 60 | #define _COMPONENT ACPI_PARSER |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 61 | ACPI_MODULE_NAME("psparse") |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | /******************************************************************************* |
| 64 | * |
| 65 | * FUNCTION: acpi_ps_get_opcode_size |
| 66 | * |
Bob Moore | ba494be | 2012-07-12 09:40:10 +0800 | [diff] [blame] | 67 | * PARAMETERS: opcode - An AML opcode |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | * |
| 69 | * RETURN: Size of the opcode, in bytes (1 or 2) |
| 70 | * |
| 71 | * DESCRIPTION: Get the size of the current opcode. |
| 72 | * |
| 73 | ******************************************************************************/ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 74 | u32 acpi_ps_get_opcode_size(u32 opcode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | { |
| 76 | |
| 77 | /* Extended (2-byte) opcode if > 255 */ |
| 78 | |
| 79 | if (opcode > 0x00FF) { |
| 80 | return (2); |
| 81 | } |
| 82 | |
| 83 | /* Otherwise, just a single byte opcode */ |
| 84 | |
| 85 | return (1); |
| 86 | } |
| 87 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | /******************************************************************************* |
| 89 | * |
| 90 | * FUNCTION: acpi_ps_peek_opcode |
| 91 | * |
| 92 | * PARAMETERS: parser_state - A parser state object |
| 93 | * |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 94 | * RETURN: Next AML opcode |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | * |
| 96 | * DESCRIPTION: Get next AML opcode (without incrementing AML pointer) |
| 97 | * |
| 98 | ******************************************************************************/ |
| 99 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 100 | u16 acpi_ps_peek_opcode(struct acpi_parse_state * parser_state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 102 | u8 *aml; |
| 103 | u16 opcode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | |
| 105 | aml = parser_state->aml; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 106 | opcode = (u16) ACPI_GET8(aml); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 108 | if (opcode == AML_EXTENDED_OP_PREFIX) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 109 | |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 110 | /* Extended opcode, get the second opcode byte */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | |
| 112 | aml++; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 113 | opcode = (u16) ((opcode << 8) | ACPI_GET8(aml)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | } |
| 115 | |
| 116 | return (opcode); |
| 117 | } |
| 118 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | /******************************************************************************* |
| 120 | * |
| 121 | * FUNCTION: acpi_ps_complete_this_op |
| 122 | * |
| 123 | * PARAMETERS: walk_state - Current State |
Bob Moore | ba494be | 2012-07-12 09:40:10 +0800 | [diff] [blame] | 124 | * op - Op to complete |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | * |
Robert Moore | 88ac00f | 2005-05-26 00:00:00 -0400 | [diff] [blame] | 126 | * RETURN: Status |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | * |
| 128 | * DESCRIPTION: Perform any cleanup at the completion of an Op. |
| 129 | * |
| 130 | ******************************************************************************/ |
| 131 | |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 132 | acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 133 | acpi_ps_complete_this_op(struct acpi_walk_state * walk_state, |
| 134 | union acpi_parse_object * op) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 136 | union acpi_parse_object *prev; |
| 137 | union acpi_parse_object *next; |
| 138 | const struct acpi_opcode_info *parent_info; |
| 139 | union acpi_parse_object *replacement_op = NULL; |
Lin Ming | c35def2 | 2008-09-27 11:28:46 +0800 | [diff] [blame] | 140 | acpi_status status = AE_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 142 | ACPI_FUNCTION_TRACE_PTR(ps_complete_this_op, op); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | |
| 144 | /* Check for null Op, can happen if AML code is corrupt */ |
| 145 | |
| 146 | if (!op) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 147 | return_ACPI_STATUS(AE_OK); /* OK for now */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | } |
| 149 | |
| 150 | /* Delete this op and the subtree below it if asked to */ |
| 151 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 152 | if (((walk_state->parse_flags & ACPI_PARSE_TREE_MASK) != |
| 153 | ACPI_PARSE_DELETE_TREE) |
| 154 | || (walk_state->op_info->class == AML_CLASS_ARGUMENT)) { |
| 155 | return_ACPI_STATUS(AE_OK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | } |
| 157 | |
| 158 | /* Make sure that we only delete this subtree */ |
| 159 | |
| 160 | if (op->common.parent) { |
Robert Moore | 88ac00f | 2005-05-26 00:00:00 -0400 | [diff] [blame] | 161 | prev = op->common.parent->common.value.arg; |
| 162 | if (!prev) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 163 | |
Robert Moore | 88ac00f | 2005-05-26 00:00:00 -0400 | [diff] [blame] | 164 | /* Nothing more to do */ |
| 165 | |
| 166 | goto cleanup; |
| 167 | } |
| 168 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | /* |
| 170 | * Check if we need to replace the operator and its subtree |
| 171 | * with a return value op (placeholder op) |
| 172 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 173 | parent_info = |
| 174 | acpi_ps_get_opcode_info(op->common.parent->common. |
| 175 | aml_opcode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | |
| 177 | switch (parent_info->class) { |
| 178 | case AML_CLASS_CONTROL: |
Chao Guan | 1d1ea1b | 2013-06-08 00:58:14 +0000 | [diff] [blame] | 179 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | break; |
| 181 | |
| 182 | case AML_CLASS_CREATE: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | /* |
| 184 | * These opcodes contain term_arg operands. The current |
| 185 | * op must be replaced by a placeholder return op |
| 186 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 187 | replacement_op = |
| 188 | acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | if (!replacement_op) { |
Lin Ming | c35def2 | 2008-09-27 11:28:46 +0800 | [diff] [blame] | 190 | status = AE_NO_MEMORY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | } |
| 192 | break; |
| 193 | |
| 194 | case AML_CLASS_NAMED_OBJECT: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | /* |
| 196 | * These opcodes contain term_arg operands. The current |
| 197 | * op must be replaced by a placeholder return op |
| 198 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 199 | if ((op->common.parent->common.aml_opcode == |
| 200 | AML_REGION_OP) |
| 201 | || (op->common.parent->common.aml_opcode == |
| 202 | AML_DATA_REGION_OP) |
| 203 | || (op->common.parent->common.aml_opcode == |
| 204 | AML_BUFFER_OP) |
| 205 | || (op->common.parent->common.aml_opcode == |
| 206 | AML_PACKAGE_OP) |
| 207 | || (op->common.parent->common.aml_opcode == |
Lin Ming | ef805d9 | 2008-04-10 19:06:41 +0400 | [diff] [blame] | 208 | AML_BANK_FIELD_OP) |
| 209 | || (op->common.parent->common.aml_opcode == |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 210 | AML_VAR_PACKAGE_OP)) { |
| 211 | replacement_op = |
| 212 | acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | if (!replacement_op) { |
Lin Ming | c35def2 | 2008-09-27 11:28:46 +0800 | [diff] [blame] | 214 | status = AE_NO_MEMORY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 216 | } else |
| 217 | if ((op->common.parent->common.aml_opcode == |
| 218 | AML_NAME_OP) |
| 219 | && (walk_state->pass_number <= |
| 220 | ACPI_IMODE_LOAD_PASS2)) { |
| 221 | if ((op->common.aml_opcode == AML_BUFFER_OP) |
| 222 | || (op->common.aml_opcode == AML_PACKAGE_OP) |
| 223 | || (op->common.aml_opcode == |
| 224 | AML_VAR_PACKAGE_OP)) { |
| 225 | replacement_op = |
| 226 | acpi_ps_alloc_op(op->common. |
| 227 | aml_opcode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | if (!replacement_op) { |
Lin Ming | c35def2 | 2008-09-27 11:28:46 +0800 | [diff] [blame] | 229 | status = AE_NO_MEMORY; |
| 230 | } else { |
| 231 | replacement_op->named.data = |
| 232 | op->named.data; |
| 233 | replacement_op->named.length = |
| 234 | op->named.length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | } |
| 237 | } |
| 238 | break; |
| 239 | |
| 240 | default: |
Robert Moore | 88ac00f | 2005-05-26 00:00:00 -0400 | [diff] [blame] | 241 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 242 | replacement_op = |
| 243 | acpi_ps_alloc_op(AML_INT_RETURN_VALUE_OP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | if (!replacement_op) { |
Lin Ming | c35def2 | 2008-09-27 11:28:46 +0800 | [diff] [blame] | 245 | status = AE_NO_MEMORY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | } |
| 247 | } |
| 248 | |
| 249 | /* We must unlink this op from the parent tree */ |
| 250 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | if (prev == op) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 252 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | /* This op is the first in the list */ |
| 254 | |
| 255 | if (replacement_op) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 256 | replacement_op->common.parent = |
| 257 | op->common.parent; |
| 258 | replacement_op->common.value.arg = NULL; |
| 259 | replacement_op->common.node = op->common.node; |
| 260 | op->common.parent->common.value.arg = |
| 261 | replacement_op; |
| 262 | replacement_op->common.next = op->common.next; |
| 263 | } else { |
| 264 | op->common.parent->common.value.arg = |
| 265 | op->common.next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | } |
| 267 | } |
| 268 | |
| 269 | /* Search the parent list */ |
| 270 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 271 | else |
| 272 | while (prev) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 273 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 274 | /* Traverse all siblings in the parent's argument list */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 276 | next = prev->common.next; |
| 277 | if (next == op) { |
| 278 | if (replacement_op) { |
| 279 | replacement_op->common.parent = |
| 280 | op->common.parent; |
| 281 | replacement_op->common.value. |
| 282 | arg = NULL; |
| 283 | replacement_op->common.node = |
| 284 | op->common.node; |
| 285 | prev->common.next = |
| 286 | replacement_op; |
| 287 | replacement_op->common.next = |
| 288 | op->common.next; |
| 289 | next = NULL; |
| 290 | } else { |
| 291 | prev->common.next = |
| 292 | op->common.next; |
| 293 | next = NULL; |
| 294 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 296 | prev = next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | } |
| 299 | |
Lv Zheng | 10622bf | 2013-10-29 09:30:02 +0800 | [diff] [blame] | 300 | cleanup: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 302 | /* Now we can actually delete the subtree rooted at Op */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 304 | acpi_ps_delete_parse_tree(op); |
Lin Ming | c35def2 | 2008-09-27 11:28:46 +0800 | [diff] [blame] | 305 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | } |
| 307 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | /******************************************************************************* |
| 309 | * |
| 310 | * FUNCTION: acpi_ps_next_parse_state |
| 311 | * |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 312 | * PARAMETERS: walk_state - Current state |
Bob Moore | ba494be | 2012-07-12 09:40:10 +0800 | [diff] [blame] | 313 | * op - Current parse op |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 314 | * callback_status - Status from previous operation |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | * |
| 316 | * RETURN: Status |
| 317 | * |
| 318 | * DESCRIPTION: Update the parser state based upon the return exception from |
| 319 | * the parser callback. |
| 320 | * |
| 321 | ******************************************************************************/ |
| 322 | |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 323 | acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 324 | acpi_ps_next_parse_state(struct acpi_walk_state *walk_state, |
| 325 | union acpi_parse_object *op, |
| 326 | acpi_status callback_status) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 328 | struct acpi_parse_state *parser_state = &walk_state->parser_state; |
| 329 | acpi_status status = AE_CTRL_PENDING; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 331 | ACPI_FUNCTION_TRACE_PTR(ps_next_parse_state, op); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | |
| 333 | switch (callback_status) { |
| 334 | case AE_CTRL_TERMINATE: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | /* |
| 336 | * A control method was terminated via a RETURN statement. |
| 337 | * The walk of this method is complete. |
| 338 | */ |
| 339 | parser_state->aml = parser_state->aml_end; |
| 340 | status = AE_CTRL_TERMINATE; |
| 341 | break; |
| 342 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | case AE_CTRL_BREAK: |
| 344 | |
| 345 | parser_state->aml = walk_state->aml_last_while; |
| 346 | walk_state->control_state->common.value = FALSE; |
Bob Moore | 773069d | 2008-04-10 19:06:36 +0400 | [diff] [blame] | 347 | status = AE_CTRL_BREAK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | break; |
| 349 | |
| 350 | case AE_CTRL_CONTINUE: |
| 351 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | parser_state->aml = walk_state->aml_last_while; |
Bob Moore | 773069d | 2008-04-10 19:06:36 +0400 | [diff] [blame] | 353 | status = AE_CTRL_CONTINUE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | break; |
| 355 | |
| 356 | case AE_CTRL_PENDING: |
| 357 | |
| 358 | parser_state->aml = walk_state->aml_last_while; |
| 359 | break; |
| 360 | |
| 361 | #if 0 |
| 362 | case AE_CTRL_SKIP: |
| 363 | |
| 364 | parser_state->aml = parser_state->scope->parse_scope.pkg_end; |
| 365 | status = AE_OK; |
| 366 | break; |
| 367 | #endif |
| 368 | |
| 369 | case AE_CTRL_TRUE: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | /* |
| 371 | * Predicate of an IF was true, and we are at the matching ELSE. |
| 372 | * Just close out this package |
| 373 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 374 | parser_state->aml = acpi_ps_get_next_package_end(parser_state); |
Bob Moore | 773069d | 2008-04-10 19:06:36 +0400 | [diff] [blame] | 375 | status = AE_CTRL_PENDING; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | break; |
| 377 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | case AE_CTRL_FALSE: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | /* |
| 380 | * Either an IF/WHILE Predicate was false or we encountered a BREAK |
Bob Moore | 73a3090 | 2012-10-31 02:26:55 +0000 | [diff] [blame] | 381 | * opcode. In both cases, we do not execute the rest of the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | * package; We simply close out the parent (finishing the walk of |
| 383 | * this branch of the tree) and continue execution at the parent |
| 384 | * level. |
| 385 | */ |
| 386 | parser_state->aml = parser_state->scope->parse_scope.pkg_end; |
| 387 | |
| 388 | /* In the case of a BREAK, just force a predicate (if any) to FALSE */ |
| 389 | |
| 390 | walk_state->control_state->common.value = FALSE; |
| 391 | status = AE_CTRL_END; |
| 392 | break; |
| 393 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | case AE_CTRL_TRANSFER: |
| 395 | |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 396 | /* A method call (invocation) -- transfer control */ |
| 397 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | status = AE_CTRL_TRANSFER; |
| 399 | walk_state->prev_op = op; |
| 400 | walk_state->method_call_op = op; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 401 | walk_state->method_call_node = |
| 402 | (op->common.value.arg)->common.node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | |
| 404 | /* Will return value (if any) be used by the caller? */ |
| 405 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 406 | walk_state->return_used = |
| 407 | acpi_ds_is_result_used(op, walk_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | break; |
| 409 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | default: |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 411 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | status = callback_status; |
| 413 | if ((callback_status & AE_CODE_MASK) == AE_CODE_CONTROL) { |
| 414 | status = AE_OK; |
| 415 | } |
| 416 | break; |
| 417 | } |
| 418 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 419 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | } |
| 421 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | /******************************************************************************* |
| 423 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | * FUNCTION: acpi_ps_parse_aml |
| 425 | * |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 426 | * PARAMETERS: walk_state - Current state |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | * |
| 428 | * |
| 429 | * RETURN: Status |
| 430 | * |
| 431 | * DESCRIPTION: Parse raw AML and return a tree of ops |
| 432 | * |
| 433 | ******************************************************************************/ |
| 434 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 435 | acpi_status acpi_ps_parse_aml(struct acpi_walk_state *walk_state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 437 | acpi_status status; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 438 | struct acpi_thread_state *thread; |
| 439 | struct acpi_thread_state *prev_walk_list = acpi_gbl_current_walk_list; |
| 440 | struct acpi_walk_state *previous_walk_state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 442 | ACPI_FUNCTION_TRACE(ps_parse_aml); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 444 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 445 | "Entered with WalkState=%p Aml=%p size=%X\n", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 446 | walk_state, walk_state->parser_state.aml, |
| 447 | walk_state->parser_state.aml_size)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | |
Bob Moore | a8fadc9 | 2008-11-13 09:45:35 +0800 | [diff] [blame] | 449 | if (!walk_state->parser_state.aml) { |
| 450 | return_ACPI_STATUS(AE_NULL_OBJECT); |
| 451 | } |
| 452 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | /* Create and initialize a new thread state */ |
| 454 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 455 | thread = acpi_ut_create_thread_state(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | if (!thread) { |
Lin Ming | 84d4db7 | 2008-11-12 14:56:59 +0800 | [diff] [blame] | 457 | if (walk_state->method_desc) { |
| 458 | |
| 459 | /* Executing a control method - additional cleanup */ |
| 460 | |
Lv Zheng | 1f86e8c | 2012-10-31 02:25:45 +0000 | [diff] [blame] | 461 | acpi_ds_terminate_control_method(walk_state-> |
| 462 | method_desc, |
| 463 | walk_state); |
Lin Ming | 84d4db7 | 2008-11-12 14:56:59 +0800 | [diff] [blame] | 464 | } |
| 465 | |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 466 | acpi_ds_delete_walk_state(walk_state); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 467 | return_ACPI_STATUS(AE_NO_MEMORY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | } |
| 469 | |
| 470 | walk_state->thread = thread; |
Bob Moore | 967440e3 | 2006-06-23 17:04:00 -0400 | [diff] [blame] | 471 | |
| 472 | /* |
| 473 | * If executing a method, the starting sync_level is this method's |
| 474 | * sync_level |
| 475 | */ |
| 476 | if (walk_state->method_desc) { |
| 477 | walk_state->thread->current_sync_level = |
| 478 | walk_state->method_desc->method.sync_level; |
| 479 | } |
| 480 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 481 | acpi_ds_push_walk_state(walk_state, thread); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | |
| 483 | /* |
| 484 | * This global allows the AML debugger to get a handle to the currently |
| 485 | * executing control method. |
| 486 | */ |
| 487 | acpi_gbl_current_walk_list = thread; |
| 488 | |
| 489 | /* |
Bob Moore | 73a3090 | 2012-10-31 02:26:55 +0000 | [diff] [blame] | 490 | * Execute the walk loop as long as there is a valid Walk State. This |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | * handles nested control method invocations without recursion. |
| 492 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 493 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "State=%p\n", walk_state)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | |
| 495 | status = AE_OK; |
| 496 | while (walk_state) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 497 | if (ACPI_SUCCESS(status)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | /* |
| 499 | * The parse_loop executes AML until the method terminates |
| 500 | * or calls another method. |
| 501 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 502 | status = acpi_ps_parse_loop(walk_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | } |
| 504 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 505 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
| 506 | "Completed one call to walk loop, %s State=%p\n", |
| 507 | acpi_format_exception(status), walk_state)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | |
| 509 | if (status == AE_CTRL_TRANSFER) { |
| 510 | /* |
| 511 | * A method call was detected. |
| 512 | * Transfer control to the called control method |
| 513 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 514 | status = |
| 515 | acpi_ds_call_control_method(thread, walk_state, |
| 516 | NULL); |
Bob Moore | 967440e3 | 2006-06-23 17:04:00 -0400 | [diff] [blame] | 517 | if (ACPI_FAILURE(status)) { |
| 518 | status = |
| 519 | acpi_ds_method_error(status, walk_state); |
| 520 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | |
| 522 | /* |
| 523 | * If the transfer to the new method method call worked, a new walk |
| 524 | * state was created -- get it |
| 525 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 526 | walk_state = acpi_ds_get_current_walk_state(thread); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | continue; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 528 | } else if (status == AE_CTRL_TERMINATE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | status = AE_OK; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 530 | } else if ((status != AE_OK) && (walk_state->method_desc)) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 531 | |
Bob Moore | c51a4de | 2005-11-17 13:07:00 -0500 | [diff] [blame] | 532 | /* Either the method parse or actual execution failed */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 534 | ACPI_ERROR_METHOD("Method parse/execution failed", |
| 535 | walk_state->method_node, NULL, |
| 536 | status); |
Robert Moore | aff8c27 | 2005-09-02 17:24:17 -0400 | [diff] [blame] | 537 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | /* Check for possible multi-thread reentrancy problem */ |
| 539 | |
| 540 | if ((status == AE_ALREADY_EXISTS) && |
Lin Ming | 2629484 | 2011-01-12 09:19:43 +0800 | [diff] [blame] | 541 | (!(walk_state->method_desc->method. |
| 542 | info_flags & ACPI_METHOD_SERIALIZED))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | /* |
Lin Ming | 2629484 | 2011-01-12 09:19:43 +0800 | [diff] [blame] | 544 | * Method is not serialized and tried to create an object |
| 545 | * twice. The probable cause is that the method cannot |
| 546 | * handle reentrancy. Mark as "pending serialized" now, and |
| 547 | * then mark "serialized" when the last thread exits. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | */ |
Lin Ming | 2629484 | 2011-01-12 09:19:43 +0800 | [diff] [blame] | 549 | walk_state->method_desc->method.info_flags |= |
| 550 | ACPI_METHOD_SERIALIZED_PENDING; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | } |
| 552 | } |
| 553 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | /* We are done with this walk, move on to the parent if any */ |
| 555 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 556 | walk_state = acpi_ds_pop_walk_state(thread); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | |
| 558 | /* Reset the current scope to the beginning of scope stack */ |
| 559 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 560 | acpi_ds_scope_stack_clear(walk_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | |
| 562 | /* |
Bob Moore | c51a4de | 2005-11-17 13:07:00 -0500 | [diff] [blame] | 563 | * If we just returned from the execution of a control method or if we |
| 564 | * encountered an error during the method parse phase, there's lots of |
| 565 | * cleanup to do |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | */ |
Bob Moore | c51a4de | 2005-11-17 13:07:00 -0500 | [diff] [blame] | 567 | if (((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) == |
| 568 | ACPI_PARSE_EXECUTE) || (ACPI_FAILURE(status))) { |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 569 | acpi_ds_terminate_control_method(walk_state-> |
| 570 | method_desc, |
| 571 | walk_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | } |
| 573 | |
| 574 | /* Delete this walk state and all linked control states */ |
| 575 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 576 | acpi_ps_cleanup_scope(&walk_state->parser_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | previous_walk_state = walk_state; |
| 578 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 579 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 580 | "ReturnValue=%p, ImplicitValue=%p State=%p\n", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 581 | walk_state->return_desc, |
| 582 | walk_state->implicit_return_obj, walk_state)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | |
| 584 | /* Check if we have restarted a preempted walk */ |
| 585 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 586 | walk_state = acpi_ds_get_current_walk_state(thread); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | if (walk_state) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 588 | if (ACPI_SUCCESS(status)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | /* |
| 590 | * There is another walk state, restart it. |
| 591 | * If the method return value is not used by the parent, |
| 592 | * The object is deleted |
| 593 | */ |
| 594 | if (!previous_walk_state->return_desc) { |
Lin Ming | 9accd464 | 2008-04-10 19:06:42 +0400 | [diff] [blame] | 595 | /* |
| 596 | * In slack mode execution, if there is no return value |
| 597 | * we should implicitly return zero (0) as a default value. |
| 598 | */ |
| 599 | if (acpi_gbl_enable_interpreter_slack && |
| 600 | !previous_walk_state-> |
| 601 | implicit_return_obj) { |
| 602 | previous_walk_state-> |
| 603 | implicit_return_obj = |
Bob Moore | dc95a27 | 2009-11-12 09:52:45 +0800 | [diff] [blame] | 604 | acpi_ut_create_integer_object |
| 605 | ((u64) 0); |
Lin Ming | 9accd464 | 2008-04-10 19:06:42 +0400 | [diff] [blame] | 606 | if (!previous_walk_state-> |
| 607 | implicit_return_obj) { |
| 608 | return_ACPI_STATUS |
| 609 | (AE_NO_MEMORY); |
| 610 | } |
Lin Ming | 9accd464 | 2008-04-10 19:06:42 +0400 | [diff] [blame] | 611 | } |
| 612 | |
| 613 | /* Restart the calling control method */ |
| 614 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 615 | status = |
| 616 | acpi_ds_restart_control_method |
| 617 | (walk_state, |
| 618 | previous_walk_state-> |
| 619 | implicit_return_obj); |
| 620 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | /* |
| 622 | * We have a valid return value, delete any implicit |
| 623 | * return value. |
| 624 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 625 | acpi_ds_clear_implicit_return |
| 626 | (previous_walk_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 628 | status = |
| 629 | acpi_ds_restart_control_method |
| 630 | (walk_state, |
| 631 | previous_walk_state->return_desc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 633 | if (ACPI_SUCCESS(status)) { |
| 634 | walk_state->walk_type |= |
| 635 | ACPI_WALK_METHOD_RESTART; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 637 | } else { |
Lin Ming | d8a0ec9 | 2008-09-27 11:50:24 +0800 | [diff] [blame] | 638 | /* On error, delete any return object or implicit return */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 640 | acpi_ut_remove_reference(previous_walk_state-> |
| 641 | return_desc); |
Lin Ming | d8a0ec9 | 2008-09-27 11:50:24 +0800 | [diff] [blame] | 642 | acpi_ds_clear_implicit_return |
| 643 | (previous_walk_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | } |
| 645 | } |
| 646 | |
| 647 | /* |
| 648 | * Just completed a 1st-level method, save the final internal return |
| 649 | * value (if any) |
| 650 | */ |
| 651 | else if (previous_walk_state->caller_return_desc) { |
| 652 | if (previous_walk_state->implicit_return_obj) { |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 653 | *(previous_walk_state->caller_return_desc) = |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 654 | previous_walk_state->implicit_return_obj; |
| 655 | } else { |
| 656 | /* NULL if no return value */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 658 | *(previous_walk_state->caller_return_desc) = |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 659 | previous_walk_state->return_desc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 661 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | if (previous_walk_state->return_desc) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 663 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | /* Caller doesn't want it, must delete it */ |
| 665 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 666 | acpi_ut_remove_reference(previous_walk_state-> |
| 667 | return_desc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | } |
| 669 | if (previous_walk_state->implicit_return_obj) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 670 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | /* Caller doesn't want it, must delete it */ |
| 672 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 673 | acpi_ut_remove_reference(previous_walk_state-> |
| 674 | implicit_return_obj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | } |
| 676 | } |
| 677 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 678 | acpi_ds_delete_walk_state(previous_walk_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | } |
| 680 | |
| 681 | /* Normal exit */ |
| 682 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 683 | acpi_ex_release_all_mutexes(thread); |
| 684 | acpi_ut_delete_generic_state(ACPI_CAST_PTR |
| 685 | (union acpi_generic_state, thread)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | acpi_gbl_current_walk_list = prev_walk_list; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 687 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | } |