drivers/acpi/executer/exoparg6.c

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: exoparg6 - AML execution - opcodes with 6 arguments
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2005, R. Byron Moore
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45
  46 #include <acpi/acpi.h>
  47 #include <acpi/acinterp.h>
  48 #include <acpi/acparser.h>
  49 #include <acpi/amlcode.h>
  50
  51
  52 #define _COMPONENT          ACPI_EXECUTER
  53          ACPI_MODULE_NAME    ("exoparg6")
  54
  55
  56 /*!
  57  * Naming convention for AML interpreter execution routines.
  58  *
  59  * The routines that begin execution of AML opcodes are named with a common
  60  * convention based upon the number of arguments, the number of target operands,
  61  * and whether or not a value is returned:
  62  *
  63  *      AcpiExOpcode_xA_yT_zR
  64  *
  65  * Where:
  66  *
  67  * xA - ARGUMENTS:    The number of arguments (input operands) that are
  68  *                    required for this opcode type (1 through 6 args).
  69  * yT - TARGETS:      The number of targets (output operands) that are required
  70  *                    for this opcode type (0, 1, or 2 targets).
  71  * zR - RETURN VALUE: Indicates whether this opcode type returns a value
  72  *                    as the function return (0 or 1).
  73  *
  74  * The AcpiExOpcode* functions are called via the Dispatcher component with
  75  * fully resolved operands.
  76 !*/
  77
  78
  79 /*******************************************************************************
  80  *
  81  * FUNCTION:    acpi_ex_do_match
  82  *
  83  * PARAMETERS:  match_op        - The AML match operand
  84  *              package_obj     - Object from the target package
  85  *              match_obj       - Object to be matched
  86  *
  87  * RETURN:      TRUE if the match is successful, FALSE otherwise
  88  *
  89  * DESCRIPTION: Implements the low-level match for the ASL Match operator.
  90  *              Package elements will be implicitly converted to the type of
  91  *              the match object (Integer/Buffer/String).
  92  *
  93  ******************************************************************************/
  94
  95 u8
  96 acpi_ex_do_match (
  97         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         /*
 106          * Note: Since the package_obj/match_obj ordering is opposite to that of
 107          * the standard logical operators, we have to reverse them when we call
 108          * do_logical_op in order to make the implicit conversion rules work
 109          * correctly. However, this means we have to flip the entire equation
 110          * also. A bit ugly perhaps, but overall, better than fussing the
 111          * parameters around at runtime, over and over again.
 112          *
 113          * Below, P[i] refers to the package element, M refers to the Match object.
 114          */
 115         switch (match_op) {
 116         case MATCH_MTR:
 117
 118                 /* Always true */
 119
 120                 break;
 121
 122         case MATCH_MEQ:
 123
 124                 /*
 125                  * True if equal: (P[i] == M)
 126                  * Change to:     (M == P[i])
 127                  */
 128                 status = acpi_ex_do_logical_op (AML_LEQUAL_OP, match_obj, package_obj,
 129                                  &logical_result);
 130                 if (ACPI_FAILURE (status)) {
 131                         return (FALSE);
 132                 }
 133                 break;
 134
 135         case MATCH_MLE:
 136
 137                 /*
 138                  * True if less than or equal: (P[i] <= M) (P[i] not_greater than M)
 139                  * Change to:                  (M >= P[i]) (M not_less than P[i])
 140                  */
 141                 status = acpi_ex_do_logical_op (AML_LLESS_OP, match_obj, package_obj,
 142                                  &logical_result);
 143                 if (ACPI_FAILURE (status)) {
 144                         return (FALSE);
 145                 }
 146                 logical_result = (u8) !logical_result;
 147                 break;
 148
 149         case MATCH_MLT:
 150
 151                 /*
 152                  * True if less than: (P[i] < M)
 153                  * Change to:         (M > P[i])
 154                  */
 155                 status = acpi_ex_do_logical_op (AML_LGREATER_OP, match_obj, package_obj,
 156                                  &logical_result);
 157                 if (ACPI_FAILURE (status)) {
 158                         return (FALSE);
 159                 }
 160                 break;
 161
 162         case MATCH_MGE:
 163
 164                 /*
 165                  * True if greater than or equal: (P[i] >= M) (P[i] not_less than M)
 166                  * Change to:                     (M <= P[i]) (M not_greater than P[i])
 167                  */
 168                 status = acpi_ex_do_logical_op (AML_LGREATER_OP, match_obj, package_obj,
 169                                  &logical_result);
 170                 if (ACPI_FAILURE (status)) {
 171                         return (FALSE);
 172                 }
 173                 logical_result = (u8)!logical_result;
 174                 break;
 175
 176         case MATCH_MGT:
 177
 178                 /*
 179                  * True if greater than: (P[i] > M)
 180                  * Change to:            (M < P[i])
 181                  */
 182                 status = acpi_ex_do_logical_op (AML_LLESS_OP, match_obj, package_obj,
 183                                  &logical_result);
 184                 if (ACPI_FAILURE (status)) {
 185                         return (FALSE);
 186                 }
 187                 break;
 188
 189         default:
 190
 191                 /* Undefined */
 192
 193                 return (FALSE);
 194         }
 195
 196         return logical_result;
 197 }
 198
 199
 200 /*******************************************************************************
 201  *
 202  * FUNCTION:    acpi_ex_opcode_6A_0T_1R
 203  *
 204  * PARAMETERS:  walk_state          - Current walk state
 205  *
 206  * RETURN:      Status
 207  *
 208  * DESCRIPTION: Execute opcode with 6 arguments, no target, and a return value
 209  *
 210  ******************************************************************************/
 211
 212 acpi_status
 213 acpi_ex_opcode_6A_0T_1R (
 214         struct acpi_walk_state          *walk_state)
 215 {
 216         union acpi_operand_object       **operand = &walk_state->operands[0];
 217         union acpi_operand_object       *return_desc = NULL;
 218         acpi_status                     status = AE_OK;
 219         u32                             index;
 220         union acpi_operand_object       *this_element;
 221
 222
 223         ACPI_FUNCTION_TRACE_STR ("ex_opcode_6A_0T_1R", acpi_ps_get_opcode_name (walk_state->opcode));
 224
 225
 226         switch (walk_state->opcode) {
 227         case AML_MATCH_OP:
 228                 /*
 229                  * Match (search_pkg[0], match_op1[1], match_obj1[2],
 230                  *                      match_op2[3], match_obj2[4], start_index[5])
 231                  */
 232
 233                 /* Validate both Match Term Operators (MTR, MEQ, etc.) */
 234
 235                 if ((operand[1]->integer.value > MAX_MATCH_OPERATOR) ||
 236                         (operand[3]->integer.value > MAX_MATCH_OPERATOR)) {
 237                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Match operator out of range\n"));
 238                         status = AE_AML_OPERAND_VALUE;
 239                         goto cleanup;
 240                 }
 241
 242                 /* Get the package start_index, validate against the package length */
 243
 244                 index = (u32) operand[5]->integer.value;
 245                 if (index >= (u32) operand[0]->package.count) {
 246                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Index beyond package end\n"));
 247                         status = AE_AML_PACKAGE_LIMIT;
 248                         goto cleanup;
 249                 }
 250
 251                 /* Create an integer for the return value */
 252
 253                 return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
 254                 if (!return_desc) {
 255                         status = AE_NO_MEMORY;
 256                         goto cleanup;
 257
 258                 }
 259
 260                 /* Default return value if no match found */
 261
 262                 return_desc->integer.value = ACPI_INTEGER_MAX;
 263
 264                 /*
 265                  * Examine each element until a match is found. Both match conditions
 266                  * must be satisfied for a match to occur. Within the loop,
 267                  * "continue" signifies that the current element does not match
 268                  * and the next should be examined.
 269                  *
 270                  * Upon finding a match, the loop will terminate via "break" at
 271                  * the bottom.  If it terminates "normally", match_value will be
 272                  * ACPI_INTEGER_MAX (Ones) (its initial value) indicating that no
 273                  * match was found.
 274                  */
 275                 for ( ; index < operand[0]->package.count; index++) {
 276                         /* Get the current package element */
 277
 278                         this_element = operand[0]->package.elements[index];
 279
 280                         /* Treat any uninitialized (NULL) elements as non-matching */
 281
 282                         if (!this_element) {
 283                                 continue;
 284                         }
 285
 286                         /*
 287                          * Both match conditions must be satisfied. Execution of a continue
 288                          * (proceed to next iteration of enclosing for loop) signifies a
 289                          * non-match.
 290                          */
 291                         if (!acpi_ex_do_match ((u32) operand[1]->integer.value,
 292                                            this_element, operand[2])) {
 293                                 continue;
 294                         }
 295
 296                         if (!acpi_ex_do_match ((u32) operand[3]->integer.value,
 297                                            this_element, operand[4])) {
 298                                 continue;
 299                         }
 300
 301                         /* Match found: Index is the return value */
 302
 303                         return_desc->integer.value = index;
 304                         break;
 305                 }
 306                 break;
 307
 308
 309         case AML_LOAD_TABLE_OP:
 310
 311                 status = acpi_ex_load_table_op (walk_state, &return_desc);
 312                 break;
 313
 314
 315         default:
 316
 317                 ACPI_REPORT_ERROR (("acpi_ex_opcode_3A_0T_0R: Unknown opcode %X\n",
 318                                 walk_state->opcode));
 319                 status = AE_AML_BAD_OPCODE;
 320                 goto cleanup;
 321         }
 322
 323
 324         walk_state->result_obj = return_desc;
 325
 326
 327 cleanup:
 328
 329         /* Delete return object on error */
 330
 331         if (ACPI_FAILURE (status)) {
 332                 acpi_ut_remove_reference (return_desc);
 333         }
 334
 335         return_ACPI_STATUS (status);
 336 }