drivers/acpi/acpica/exoparg6.c

   1 /******************************************************************************
   2  *
   3  * Module Name: exoparg6 - AML execution - opcodes with 6 arguments
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2013, Intel Corp.
   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
  44 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "acinterp.h"
  47 #include "acparser.h"
  48 #include "amlcode.h"
  49
  50 #define _COMPONENT          ACPI_EXECUTER
  51 ACPI_MODULE_NAME("exoparg6")
  52
  53 /*!
  54  * Naming convention for AML interpreter execution routines.
  55  *
  56  * The routines that begin execution of AML opcodes are named with a common
  57  * convention based upon the number of arguments, the number of target operands,
  58  * and whether or not a value is returned:
  59  *
  60  *      AcpiExOpcode_xA_yT_zR
  61  *
  62  * Where:
  63  *
  64  * xA - ARGUMENTS:    The number of arguments (input operands) that are
  65  *                    required for this opcode type (1 through 6 args).
  66  * yT - TARGETS:      The number of targets (output operands) that are required
  67  *                    for this opcode type (0, 1, or 2 targets).
  68  * zR - RETURN VALUE: Indicates whether this opcode type returns a value
  69  *                    as the function return (0 or 1).
  70  *
  71  * The AcpiExOpcode* functions are called via the Dispatcher component with
  72  * fully resolved operands.
  73 !*/
  74 /* Local prototypes */
  75 static u8
  76 acpi_ex_do_match(u32 match_op,
  77                  union acpi_operand_object *package_obj,
  78                  union acpi_operand_object *match_obj);
  79
  80 /*******************************************************************************
  81  *
  82  * FUNCTION:    acpi_ex_do_match
  83  *
  84  * PARAMETERS:  match_op        - The AML match operand
  85  *              package_obj     - Object from the target package
  86  *              match_obj       - Object to be matched
  87  *
  88  * RETURN:      TRUE if the match is successful, FALSE otherwise
  89  *
  90  * DESCRIPTION: Implements the low-level match for the ASL Match operator.
  91  *              Package elements will be implicitly converted to the type of
  92  *              the match object (Integer/Buffer/String).
  93  *
  94  ******************************************************************************/
  95
  96 static u8
  97 acpi_ex_do_match(u32 match_op,
  98                  union acpi_operand_object *package_obj,
  99                  union acpi_operand_object *match_obj)
 100 {
 101         u8 logical_result = TRUE;
 102         acpi_status status;
 103
 104         /*
 105          * Note: Since the package_obj/match_obj ordering is opposite to that of
 106          * the standard logical operators, we have to reverse them when we call
 107          * do_logical_op in order to make the implicit conversion rules work
 108          * correctly. However, this means we have to flip the entire equation
 109          * also. A bit ugly perhaps, but overall, better than fussing the
 110          * parameters around at runtime, over and over again.
 111          *
 112          * Below, P[i] refers to the package element, M refers to the Match object.
 113          */
 114         switch (match_op) {
 115         case MATCH_MTR:
 116
 117                 /* Always true */
 118
 119                 break;
 120
 121         case MATCH_MEQ:
 122                 /*
 123                  * True if equal: (P[i] == M)
 124                  * Change to:     (M == P[i])
 125                  */
 126                 status =
 127                     acpi_ex_do_logical_op(AML_LEQUAL_OP, match_obj, package_obj,
 128                                           &logical_result);
 129                 if (ACPI_FAILURE(status)) {
 130                         return (FALSE);
 131                 }
 132                 break;
 133
 134         case MATCH_MLE:
 135                 /*
 136                  * True if less than or equal: (P[i] <= M) (P[i] not_greater than M)
 137                  * Change to:                  (M >= P[i]) (M not_less than P[i])
 138                  */
 139                 status =
 140                     acpi_ex_do_logical_op(AML_LLESS_OP, match_obj, package_obj,
 141                                           &logical_result);
 142                 if (ACPI_FAILURE(status)) {
 143                         return (FALSE);
 144                 }
 145                 logical_result = (u8) ! logical_result;
 146                 break;
 147
 148         case MATCH_MLT:
 149                 /*
 150                  * True if less than: (P[i] < M)
 151                  * Change to:         (M > P[i])
 152                  */
 153                 status =
 154                     acpi_ex_do_logical_op(AML_LGREATER_OP, match_obj,
 155                                           package_obj, &logical_result);
 156                 if (ACPI_FAILURE(status)) {
 157                         return (FALSE);
 158                 }
 159                 break;
 160
 161         case MATCH_MGE:
 162                 /*
 163                  * True if greater than or equal: (P[i] >= M) (P[i] not_less than M)
 164                  * Change to:                     (M <= P[i]) (M not_greater than P[i])
 165                  */
 166                 status =
 167                     acpi_ex_do_logical_op(AML_LGREATER_OP, match_obj,
 168                                           package_obj, &logical_result);
 169                 if (ACPI_FAILURE(status)) {
 170                         return (FALSE);
 171                 }
 172                 logical_result = (u8) ! logical_result;
 173                 break;
 174
 175         case MATCH_MGT:
 176                 /*
 177                  * True if greater than: (P[i] > M)
 178                  * Change to:            (M < P[i])
 179                  */
 180                 status =
 181                     acpi_ex_do_logical_op(AML_LLESS_OP, match_obj, package_obj,
 182                                           &logical_result);
 183                 if (ACPI_FAILURE(status)) {
 184                         return (FALSE);
 185                 }
 186                 break;
 187
 188         default:
 189
 190                 /* Undefined */
 191
 192                 return (FALSE);
 193         }
 194
 195         return (logical_result);
 196 }
 197
 198 /*******************************************************************************
 199  *
 200  * FUNCTION:    acpi_ex_opcode_6A_0T_1R
 201  *
 202  * PARAMETERS:  walk_state          - Current walk state
 203  *
 204  * RETURN:      Status
 205  *
 206  * DESCRIPTION: Execute opcode with 6 arguments, no target, and a return value
 207  *
 208  ******************************************************************************/
 209
 210 acpi_status acpi_ex_opcode_6A_0T_1R(struct acpi_walk_state * walk_state)
 211 {
 212         union acpi_operand_object **operand = &walk_state->operands[0];
 213         union acpi_operand_object *return_desc = NULL;
 214         acpi_status status = AE_OK;
 215         u64 index;
 216         union acpi_operand_object *this_element;
 217
 218         ACPI_FUNCTION_TRACE_STR(ex_opcode_6A_0T_1R,
 219                                 acpi_ps_get_opcode_name(walk_state->opcode));
 220
 221         switch (walk_state->opcode) {
 222         case AML_MATCH_OP:
 223                 /*
 224                  * Match (search_pkg[0], match_op1[1], match_obj1[2],
 225                  *                      match_op2[3], match_obj2[4], start_index[5])
 226                  */
 227
 228                 /* Validate both Match Term Operators (MTR, MEQ, etc.) */
 229
 230                 if ((operand[1]->integer.value > MAX_MATCH_OPERATOR) ||
 231                     (operand[3]->integer.value > MAX_MATCH_OPERATOR)) {
 232                         ACPI_ERROR((AE_INFO, "Match operator out of range"));
 233                         status = AE_AML_OPERAND_VALUE;
 234                         goto cleanup;
 235                 }
 236
 237                 /* Get the package start_index, validate against the package length */
 238
 239                 index = operand[5]->integer.value;
 240                 if (index >= operand[0]->package.count) {
 241                         ACPI_ERROR((AE_INFO,
 242                                     "Index (0x%8.8X%8.8X) beyond package end (0x%X)",
 243                                     ACPI_FORMAT_UINT64(index),
 244                                     operand[0]->package.count));
 245                         status = AE_AML_PACKAGE_LIMIT;
 246                         goto cleanup;
 247                 }
 248
 249                 /* Create an integer for the return value */
 250                 /* Default return value is ACPI_UINT64_MAX if no match found */
 251
 252                 return_desc = acpi_ut_create_integer_object(ACPI_UINT64_MAX);
 253                 if (!return_desc) {
 254                         status = AE_NO_MEMORY;
 255                         goto cleanup;
 256
 257                 }
 258
 259                 /*
 260                  * Examine each element until a match is found. Both match conditions
 261                  * must be satisfied for a match to occur. Within the loop,
 262                  * "continue" signifies that the current element does not match
 263                  * and the next should be examined.
 264                  *
 265                  * Upon finding a match, the loop will terminate via "break" at
 266                  * the bottom. If it terminates "normally", match_value will be
 267                  * ACPI_UINT64_MAX (Ones) (its initial value) indicating that no
 268                  * match was found.
 269                  */
 270                 for (; index < operand[0]->package.count; index++) {
 271
 272                         /* Get the current package element */
 273
 274                         this_element = operand[0]->package.elements[index];
 275
 276                         /* Treat any uninitialized (NULL) elements as non-matching */
 277
 278                         if (!this_element) {
 279                                 continue;
 280                         }
 281
 282                         /*
 283                          * Both match conditions must be satisfied. Execution of a continue
 284                          * (proceed to next iteration of enclosing for loop) signifies a
 285                          * non-match.
 286                          */
 287                         if (!acpi_ex_do_match((u32) operand[1]->integer.value,
 288                                               this_element, operand[2])) {
 289                                 continue;
 290                         }
 291
 292                         if (!acpi_ex_do_match((u32) operand[3]->integer.value,
 293                                               this_element, operand[4])) {
 294                                 continue;
 295                         }
 296
 297                         /* Match found: Index is the return value */
 298
 299                         return_desc->integer.value = index;
 300                         break;
 301                 }
 302                 break;
 303
 304         case AML_LOAD_TABLE_OP:
 305
 306                 status = acpi_ex_load_table_op(walk_state, &return_desc);
 307                 break;
 308
 309         default:
 310
 311                 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
 312                             walk_state->opcode));
 313                 status = AE_AML_BAD_OPCODE;
 314                 goto cleanup;
 315         }
 316
 317 cleanup:
 318
 319         /* Delete return object on error */
 320
 321         if (ACPI_FAILURE(status)) {
 322                 acpi_ut_remove_reference(return_desc);
 323         }
 324
 325         /* Save return object on success */
 326
 327         else {
 328                 walk_state->result_obj = return_desc;
 329         }
 330
 331         return_ACPI_STATUS(status);
 332 }