err.no Git - linux-2.6/blob - drivers/acpi/executer/exoparg3.c

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: exoparg3 - AML execution - opcodes with 3 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("exoparg3")
  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 /*******************************************************************************
  75  *
  76  * FUNCTION:    acpi_ex_opcode_3A_0T_0R
  77  *
  78  * PARAMETERS:  walk_state          - Current walk state
  79  *
  80  * RETURN:      Status
  81  *
  82  * DESCRIPTION: Execute Triadic operator (3 operands)
  83  *
  84  ******************************************************************************/
  85 acpi_status acpi_ex_opcode_3A_0T_0R(struct acpi_walk_state *walk_state)
  86 {
  87         union acpi_operand_object **operand = &walk_state->operands[0];
  88         struct acpi_signal_fatal_info *fatal;
  89         acpi_status status = AE_OK;
  90
  91         ACPI_FUNCTION_TRACE_STR(ex_opcode_3A_0T_0R,
  92                                 acpi_ps_get_opcode_name(walk_state->opcode));
  93
  94         switch (walk_state->opcode) {
  95         case AML_FATAL_OP:      /* Fatal (fatal_type fatal_code fatal_arg) */
  96
  97                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
  98                                   "FatalOp: Type %X Code %X Arg %X <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n",
  99                                   (u32) operand[0]->integer.value,
 100                                   (u32) operand[1]->integer.value,
 101                                   (u32) operand[2]->integer.value));
 102
 103                 fatal = ACPI_ALLOCATE(sizeof(struct acpi_signal_fatal_info));
 104                 if (fatal) {
 105                         fatal->type = (u32) operand[0]->integer.value;
 106                         fatal->code = (u32) operand[1]->integer.value;
 107                         fatal->argument = (u32) operand[2]->integer.value;
 108                 }
 109
 110                 /* Always signal the OS! */
 111
 112                 status = acpi_os_signal(ACPI_SIGNAL_FATAL, fatal);
 113
 114                 /* Might return while OS is shutting down, just continue */
 115
 116                 ACPI_FREE(fatal);
 117                 break;
 118
 119         default:
 120
 121                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
 122                             walk_state->opcode));
 123                 status = AE_AML_BAD_OPCODE;
 124                 goto cleanup;
 125         }
 126
 127       cleanup:
 128
 129         return_ACPI_STATUS(status);
 130 }
 131
 132 /*******************************************************************************
 133  *
 134  * FUNCTION:    acpi_ex_opcode_3A_1T_1R
 135  *
 136  * PARAMETERS:  walk_state          - Current walk state
 137  *
 138  * RETURN:      Status
 139  *
 140  * DESCRIPTION: Execute Triadic operator (3 operands)
 141  *
 142  ******************************************************************************/
 143
 144 acpi_status acpi_ex_opcode_3A_1T_1R(struct acpi_walk_state *walk_state)
 145 {
 146         union acpi_operand_object **operand = &walk_state->operands[0];
 147         union acpi_operand_object *return_desc = NULL;
 148         char *buffer = NULL;
 149         acpi_status status = AE_OK;
 150         acpi_integer index;
 151         acpi_size length;
 152
 153         ACPI_FUNCTION_TRACE_STR(ex_opcode_3A_1T_1R,
 154                                 acpi_ps_get_opcode_name(walk_state->opcode));
 155
 156         switch (walk_state->opcode) {
 157         case AML_MID_OP:        /* Mid (Source[0], Index[1], Length[2], Result[3]) */
 158
 159                 /*
 160                  * Create the return object.  The Source operand is guaranteed to be
 161                  * either a String or a Buffer, so just use its type.
 162                  */
 163                 return_desc =
 164                     acpi_ut_create_internal_object(ACPI_GET_OBJECT_TYPE
 165                                                    (operand[0]));
 166                 if (!return_desc) {
 167                         status = AE_NO_MEMORY;
 168                         goto cleanup;
 169                 }
 170
 171                 /* Get the Integer values from the objects */
 172
 173                 index = operand[1]->integer.value;
 174                 length = (acpi_size) operand[2]->integer.value;
 175
 176                 /*
 177                  * If the index is beyond the length of the String/Buffer, or if the
 178                  * requested length is zero, return a zero-length String/Buffer
 179                  */
 180                 if (index >= operand[0]->string.length) {
 181                         length = 0;
 182                 }
 183
 184                 /* Truncate request if larger than the actual String/Buffer */
 185
 186                 else if ((index + length) > operand[0]->string.length) {
 187                         length = (acpi_size) operand[0]->string.length -
 188                             (acpi_size) index;
 189                 }
 190
 191                 /* Strings always have a sub-pointer, not so for buffers */
 192
 193                 switch (ACPI_GET_OBJECT_TYPE(operand[0])) {
 194                 case ACPI_TYPE_STRING:
 195
 196                         /* Always allocate a new buffer for the String */
 197
 198                         buffer = ACPI_ALLOCATE_ZEROED((acpi_size) length + 1);
 199                         if (!buffer) {
 200                                 status = AE_NO_MEMORY;
 201                                 goto cleanup;
 202                         }
 203                         break;
 204
 205                 case ACPI_TYPE_BUFFER:
 206
 207                         /* If the requested length is zero, don't allocate a buffer */
 208
 209                         if (length > 0) {
 210
 211                                 /* Allocate a new buffer for the Buffer */
 212
 213                                 buffer = ACPI_ALLOCATE_ZEROED(length);
 214                                 if (!buffer) {
 215                                         status = AE_NO_MEMORY;
 216                                         goto cleanup;
 217                                 }
 218                         }
 219                         break;
 220
 221                 default:        /* Should not happen */
 222
 223                         status = AE_AML_OPERAND_TYPE;
 224                         goto cleanup;
 225                 }
 226
 227                 if (buffer) {
 228
 229                         /* We have a buffer, copy the portion requested */
 230
 231                         ACPI_MEMCPY(buffer, operand[0]->string.pointer + index,
 232                                     length);
 233                 }
 234
 235                 /* Set the length of the new String/Buffer */
 236
 237                 return_desc->string.pointer = buffer;
 238                 return_desc->string.length = (u32) length;
 239
 240                 /* Mark buffer initialized */
 241
 242                 return_desc->buffer.flags |= AOPOBJ_DATA_VALID;
 243                 break;
 244
 245         default:
 246
 247                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
 248                             walk_state->opcode));
 249                 status = AE_AML_BAD_OPCODE;
 250                 goto cleanup;
 251         }
 252
 253         /* Store the result in the target */
 254
 255         status = acpi_ex_store(return_desc, operand[3], walk_state);
 256
 257       cleanup:
 258
 259         /* Delete return object on error */
 260
 261         if (ACPI_FAILURE(status) || walk_state->result_obj) {
 262                 acpi_ut_remove_reference(return_desc);
 263         }
 264
 265         /* Set the return object and exit */
 266
 267         else {
 268                 walk_state->result_obj = return_desc;
 269         }
 270         return_ACPI_STATUS(status);
 271 }