drivers/acpi/acpica/exoparg6.c

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: exoparg6 - AML execution - opcodes with 6 arguments
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2008, Intel Corp.
  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 "accommon.h"
  47 #include "acinterp.h"
  48 #include "acparser.h"
  49 #include "amlcode.h"
  50
  51 #define _COMPONENT          ACPI_EXECUTER
  52 ACPI_MODULE_NAME("exoparg6")
  53
  54 /*!
  55  * Naming convention for AML interpreter execution routines.
  56  *
  57  * The routines that begin execution of AML opcodes are named with a common
  58  * convention based upon the number of arguments, the number of target operands,
  59  * and whether or not a value is returned:
  60  *
  61  *      AcpiExOpcode_xA_yT_zR
  62  *
  63  * Where:
  64  *
  65  * xA - ARGUMENTS:    The number of arguments (input operands) that are
  66  *                    required for this opcode type (1 through 6 args).
  67  * yT - TARGETS:      The number of targets (output operands) that are required
  68  *                    for this opcode type (0, 1, or 2 targets).
  69  * zR - RETURN VALUE: Indicates whether this opcode type returns a value
  70  *                    as the function return (0 or 1).
  71  *
  72  * The AcpiExOpcode* functions are called via the Dispatcher component with
  73  * fully resolved operands.
  74 !*/
  75 /* Local prototypes */
  76 static u8
  77 acpi_ex_do_match(u32 match_op,
  78                  union acpi_operand_object *package_obj,
  79                  union acpi_operand_object *match_obj);
  80
  81 /*******************************************************************************
  82  *
  83  * FUNCTION:    acpi_ex_do_match
  84  *
  85  * PARAMETERS:  match_op        - The AML match operand
  86  *              package_obj     - Object from the target package
  87  *              match_obj       - Object to be matched
  88  *
  89  * RETURN:      TRUE if the match is successful, FALSE otherwise
  90  *
  91  * DESCRIPTION: Implements the low-level match for the ASL Match operator.
  92  *              Package elements will be implicitly converted to the type of
  93  *              the match object (Integer/Buffer/String).
  94  *
  95  ******************************************************************************/
  96
  97 static u8
  98 acpi_ex_do_match(u32 match_op,
  99                  union acpi_operand_object *package_obj,
 100                  union acpi_operand_object *match_obj)
 101 {
 102         u8 logical_result = TRUE;
 103         acpi_status status;
 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 =
 129                     acpi_ex_do_logical_op(AML_LEQUAL_OP, match_obj, package_obj,
 130                                           &logical_result);
 131                 if (ACPI_FAILURE(status)) {
 132                         return (FALSE);
 133                 }
 134                 break;
 135
 136         case MATCH_MLE:
 137
 138                 /*
 139                  * True if less than or equal: (P[i] <= M) (P[i] not_greater than M)
 140                  * Change to:                  (M >= P[i]) (M not_less than P[i])
 141                  */
 142                 status =
 143                     acpi_ex_do_logical_op(AML_LLESS_OP, match_obj, package_obj,
 144                                           &logical_result);
 145                 if (ACPI_FAILURE(status)) {
 146                         return (FALSE);
 147                 }
 148                 logical_result = (u8) ! logical_result;
 149                 break;
 150
 151         case MATCH_MLT:
 152
 153                 /*
 154                  * True if less than: (P[i] < M)
 155                  * Change to:         (M > P[i])
 156                  */
 157                 status =
 158                     acpi_ex_do_logical_op(AML_LGREATER_OP, match_obj,
 159                                           package_obj, &logical_result);
 160                 if (ACPI_FAILURE(status)) {
 161                         return (FALSE);
 162                 }
 163                 break;
 164
 165         case MATCH_MGE:
 166
 167                 /*
 168                  * True if greater than or equal: (P[i] >= M) (P[i] not_less than M)
 169                  * Change to:                     (M <= P[i]) (M not_greater than P[i])
 170                  */
 171                 status =
 172                     acpi_ex_do_logical_op(AML_LGREATER_OP, match_obj,
 173                                           package_obj, &logical_result);
 174                 if (ACPI_FAILURE(status)) {
 175                         return (FALSE);
 176                 }
 177                 logical_result = (u8) ! logical_result;
 178                 break;
 179
 180         case MATCH_MGT:
 181
 182                 /*
 183                  * True if greater than: (P[i] > M)
 184                  * Change to:            (M < P[i])
 185                  */
 186                 status =
 187                     acpi_ex_do_logical_op(AML_LLESS_OP, match_obj, package_obj,
 188                                           &logical_result);
 189                 if (ACPI_FAILURE(status)) {
 190                         return (FALSE);
 191                 }
 192                 break;
 193
 194         default:
 195
 196                 /* Undefined */
 197
 198                 return (FALSE);
 199         }
 200
 201         return logical_result;
 202 }
 203
 204 /*******************************************************************************
 205  *
 206  * FUNCTION:    acpi_ex_opcode_6A_0T_1R
 207  *
 208  * PARAMETERS:  walk_state          - Current walk state
 209  *
 210  * RETURN:      Status
 211  *
 212  * DESCRIPTION: Execute opcode with 6 arguments, no target, and a return value
 213  *
 214  ******************************************************************************/
 215
 216 acpi_status acpi_ex_opcode_6A_0T_1R(struct acpi_walk_state * walk_state)
 217 {
 218         union acpi_operand_object **operand = &walk_state->operands[0];
 219         union acpi_operand_object *return_desc = NULL;
 220         acpi_status status = AE_OK;
 221         acpi_integer index;
 222         union acpi_operand_object *this_element;
 223
 224         ACPI_FUNCTION_TRACE_STR(ex_opcode_6A_0T_1R,
 225                                 acpi_ps_get_opcode_name(walk_state->opcode));
 226
 227         switch (walk_state->opcode) {
 228         case AML_MATCH_OP:
 229                 /*
 230                  * Match (search_pkg[0], match_op1[1], match_obj1[2],
 231                  *                      match_op2[3], match_obj2[4], start_index[5])
 232                  */
 233
 234                 /* Validate both Match Term Operators (MTR, MEQ, etc.) */
 235
 236                 if ((operand[1]->integer.value > MAX_MATCH_OPERATOR) ||
 237                     (operand[3]->integer.value > MAX_MATCH_OPERATOR)) {
 238                         ACPI_ERROR((AE_INFO, "Match operator out of range"));
 239                         status = AE_AML_OPERAND_VALUE;
 240                         goto cleanup;
 241                 }
 242
 243                 /* Get the package start_index, validate against the package length */
 244
 245                 index = operand[5]->integer.value;
 246                 if (index >= operand[0]->package.count) {
 247                         ACPI_ERROR((AE_INFO,
 248                                     "Index (%X%8.8X) beyond package end (%X)",
 249                                     ACPI_FORMAT_UINT64(index),
 250                                     operand[0]->package.count));
 251                         status = AE_AML_PACKAGE_LIMIT;
 252                         goto cleanup;
 253                 }
 254
 255                 /* Create an integer for the return value */
 256
 257                 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
 258                 if (!return_desc) {
 259                         status = AE_NO_MEMORY;
 260                         goto cleanup;
 261
 262                 }
 263
 264                 /* Default return value if no match found */
 265
 266                 return_desc->integer.value = ACPI_INTEGER_MAX;
 267
 268                 /*
 269                  * Examine each element until a match is found. Both match conditions
 270                  * must be satisfied for a match to occur. Within the loop,
 271                  * "continue" signifies that the current element does not match
 272                  * and the next should be examined.
 273                  *
 274                  * Upon finding a match, the loop will terminate via "break" at
 275                  * the bottom.  If it terminates "normally", match_value will be
 276                  * ACPI_INTEGER_MAX (Ones) (its initial value) indicating that no
 277                  * match was found.
 278                  */
 279                 for (; index < operand[0]->package.count; index++) {
 280
 281                         /* Get the current package element */
 282
 283                         this_element = operand[0]->package.elements[index];
 284
 285                         /* Treat any uninitialized (NULL) elements as non-matching */
 286
 287                         if (!this_element) {
 288                                 continue;
 289                         }
 290
 291                         /*
 292                          * Both match conditions must be satisfied. Execution of a continue
 293                          * (proceed to next iteration of enclosing for loop) signifies a
 294                          * non-match.
 295                          */
 296                         if (!acpi_ex_do_match((u32) operand[1]->integer.value,
 297                                               this_element, operand[2])) {
 298                                 continue;
 299                         }
 300
 301                         if (!acpi_ex_do_match((u32) operand[3]->integer.value,
 302                                               this_element, operand[4])) {
 303                                 continue;
 304                         }
 305
 306                         /* Match found: Index is the return value */
 307
 308                         return_desc->integer.value = index;
 309                         break;
 310                 }
 311                 break;
 312
 313         case AML_LOAD_TABLE_OP:
 314
 315                 status = acpi_ex_load_table_op(walk_state, &return_desc);
 316                 break;
 317
 318         default:
 319
 320                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
 321                             walk_state->opcode));
 322                 status = AE_AML_BAD_OPCODE;
 323                 goto cleanup;
 324         }
 325
 326       cleanup:
 327
 328         /* Delete return object on error */
 329
 330         if (ACPI_FAILURE(status)) {
 331                 acpi_ut_remove_reference(return_desc);
 332         }
 333
 334         /* Save return object on success */
 335
 336         else {
 337                 walk_state->result_obj = return_desc;
 338         }
 339
 340         return_ACPI_STATUS(status);
 341 }