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 - 2007, 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 #include <acpi/acpi.h>
  46 #include <acpi/acinterp.h>
  47 #include <acpi/acparser.h>
  48 #include <acpi/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                 /*
 124                  * True if equal: (P[i] == M)
 125                  * Change to:     (M == P[i])
 126                  */
 127                 status =
 128                     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 =
 142                     acpi_ex_do_logical_op(AML_LLESS_OP, match_obj, package_obj,
 143                                           &logical_result);
 144                 if (ACPI_FAILURE(status)) {
 145                         return (FALSE);
 146                 }
 147                 logical_result = (u8) ! logical_result;
 148                 break;
 149
 150         case MATCH_MLT:
 151
 152                 /*
 153                  * True if less than: (P[i] < M)
 154                  * Change to:         (M > P[i])
 155                  */
 156                 status =
 157                     acpi_ex_do_logical_op(AML_LGREATER_OP, match_obj,
 158                                           package_obj, &logical_result);
 159                 if (ACPI_FAILURE(status)) {
 160                         return (FALSE);
 161                 }
 162                 break;
 163
 164         case MATCH_MGE:
 165
 166                 /*
 167                  * True if greater than or equal: (P[i] >= M) (P[i] not_less than M)
 168                  * Change to:                     (M <= P[i]) (M not_greater than P[i])
 169                  */
 170                 status =
 171                     acpi_ex_do_logical_op(AML_LGREATER_OP, match_obj,
 172                                           package_obj, &logical_result);
 173                 if (ACPI_FAILURE(status)) {
 174                         return (FALSE);
 175                 }
 176                 logical_result = (u8) ! logical_result;
 177                 break;
 178
 179         case MATCH_MGT:
 180
 181                 /*
 182                  * True if greater than: (P[i] > M)
 183                  * Change to:            (M < P[i])
 184                  */
 185                 status =
 186                     acpi_ex_do_logical_op(AML_LLESS_OP, match_obj, package_obj,
 187                                           &logical_result);
 188                 if (ACPI_FAILURE(status)) {
 189                         return (FALSE);
 190                 }
 191                 break;
 192
 193         default:
 194
 195                 /* Undefined */
 196
 197                 return (FALSE);
 198         }
 199
 200         return logical_result;
 201 }
 202
 203 /*******************************************************************************
 204  *
 205  * FUNCTION:    acpi_ex_opcode_6A_0T_1R
 206  *
 207  * PARAMETERS:  walk_state          - Current walk state
 208  *
 209  * RETURN:      Status
 210  *
 211  * DESCRIPTION: Execute opcode with 6 arguments, no target, and a return value
 212  *
 213  ******************************************************************************/
 214
 215 acpi_status acpi_ex_opcode_6A_0T_1R(struct acpi_walk_state * walk_state)
 216 {
 217         union acpi_operand_object **operand = &walk_state->operands[0];
 218         union acpi_operand_object *return_desc = NULL;
 219         acpi_status status = AE_OK;
 220         acpi_integer index;
 221         union acpi_operand_object *this_element;
 222
 223         ACPI_FUNCTION_TRACE_STR(ex_opcode_6A_0T_1R,
 224                                 acpi_ps_get_opcode_name(walk_state->opcode));
 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_ERROR((AE_INFO, "Match operator out of range"));
 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 = operand[5]->integer.value;
 245                 if (index >= operand[0]->package.count) {
 246                         ACPI_ERROR((AE_INFO,
 247                                     "Index (%X%8.8X) beyond package end (%X)",
 248                                     ACPI_FORMAT_UINT64(index),
 249                                     operand[0]->package.count));
 250                         status = AE_AML_PACKAGE_LIMIT;
 251                         goto cleanup;
 252                 }
 253
 254                 /* Create an integer for the return value */
 255
 256                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 257                 if (!return_desc) {
 258                         status = AE_NO_MEMORY;
 259                         goto cleanup;
 260
 261                 }
 262
 263                 /* Default return value if no match found */
 264
 265                 return_desc->integer.value = ACPI_INTEGER_MAX;
 266
 267                 /*
 268                  * Examine each element until a match is found. Both match conditions
 269                  * must be satisfied for a match to occur. Within the loop,
 270                  * "continue" signifies that the current element does not match
 271                  * and the next should be examined.
 272                  *
 273                  * Upon finding a match, the loop will terminate via "break" at
 274                  * the bottom.  If it terminates "normally", match_value will be
 275                  * ACPI_INTEGER_MAX (Ones) (its initial value) indicating that no
 276                  * match was found.
 277                  */
 278                 for (; index < operand[0]->package.count; index++) {
 279
 280                         /* Get the current package element */
 281
 282                         this_element = operand[0]->package.elements[index];
 283
 284                         /* Treat any uninitialized (NULL) elements as non-matching */
 285
 286                         if (!this_element) {
 287                                 continue;
 288                         }
 289
 290                         /*
 291                          * Both match conditions must be satisfied. Execution of a continue
 292                          * (proceed to next iteration of enclosing for loop) signifies a
 293                          * non-match.
 294                          */
 295                         if (!acpi_ex_do_match((u32) operand[1]->integer.value,
 296                                               this_element, operand[2])) {
 297                                 continue;
 298                         }
 299
 300                         if (!acpi_ex_do_match((u32) operand[3]->integer.value,
 301                                               this_element, operand[4])) {
 302                                 continue;
 303                         }
 304
 305                         /* Match found: Index is the return value */
 306
 307                         return_desc->integer.value = index;
 308                         break;
 309                 }
 310                 break;
 311
 312         case AML_LOAD_TABLE_OP:
 313
 314                 status = acpi_ex_load_table_op(walk_state, &return_desc);
 315                 break;
 316
 317         default:
 318
 319                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
 320                             walk_state->opcode));
 321                 status = AE_AML_BAD_OPCODE;
 322                 goto cleanup;
 323         }
 324
 325         walk_state->result_obj = return_desc;
 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 }