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 - 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    ("exoparg3")
  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_opcode_3A_0T_0R
  82  *
  83  * PARAMETERS:  walk_state          - Current walk state
  84  *
  85  * RETURN:      Status
  86  *
  87  * DESCRIPTION: Execute Triadic operator (3 operands)
  88  *
  89  ******************************************************************************/
  90
  91 acpi_status
  92 acpi_ex_opcode_3A_0T_0R (
  93         struct acpi_walk_state          *walk_state)
  94 {
  95         union acpi_operand_object       **operand = &walk_state->operands[0];
  96         struct acpi_signal_fatal_info   *fatal;
  97         acpi_status                     status = AE_OK;
  98
  99
 100         ACPI_FUNCTION_TRACE_STR ("ex_opcode_3A_0T_0R",
 101                 acpi_ps_get_opcode_name (walk_state->opcode));
 102
 103
 104         switch (walk_state->opcode) {
 105         case AML_FATAL_OP:          /* Fatal (fatal_type fatal_code fatal_arg) */
 106
 107                 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 108                         "fatal_op: Type %X Code %X Arg %X <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n",
 109                         (u32) operand[0]->integer.value,
 110                         (u32) operand[1]->integer.value,
 111                         (u32) operand[2]->integer.value));
 112
 113                 fatal = ACPI_MEM_ALLOCATE (sizeof (struct acpi_signal_fatal_info));
 114                 if (fatal) {
 115                         fatal->type     = (u32) operand[0]->integer.value;
 116                         fatal->code     = (u32) operand[1]->integer.value;
 117                         fatal->argument = (u32) operand[2]->integer.value;
 118                 }
 119
 120                 /* Always signal the OS! */
 121
 122                 status = acpi_os_signal (ACPI_SIGNAL_FATAL, fatal);
 123
 124                 /* Might return while OS is shutting down, just continue */
 125
 126                 ACPI_MEM_FREE (fatal);
 127                 break;
 128
 129
 130         default:
 131
 132                 ACPI_REPORT_ERROR (("acpi_ex_opcode_3A_0T_0R: Unknown opcode %X\n",
 133                                 walk_state->opcode));
 134                 status = AE_AML_BAD_OPCODE;
 135                 goto cleanup;
 136         }
 137
 138
 139 cleanup:
 140
 141         return_ACPI_STATUS (status);
 142 }
 143
 144
 145 /*******************************************************************************
 146  *
 147  * FUNCTION:    acpi_ex_opcode_3A_1T_1R
 148  *
 149  * PARAMETERS:  walk_state          - Current walk state
 150  *
 151  * RETURN:      Status
 152  *
 153  * DESCRIPTION: Execute Triadic operator (3 operands)
 154  *
 155  ******************************************************************************/
 156
 157 acpi_status
 158 acpi_ex_opcode_3A_1T_1R (
 159         struct acpi_walk_state          *walk_state)
 160 {
 161         union acpi_operand_object       **operand = &walk_state->operands[0];
 162         union acpi_operand_object       *return_desc = NULL;
 163         char                            *buffer = NULL;
 164         acpi_status                     status = AE_OK;
 165         acpi_integer                    index;
 166         acpi_size                       length;
 167
 168
 169         ACPI_FUNCTION_TRACE_STR ("ex_opcode_3A_1T_1R",
 170                 acpi_ps_get_opcode_name (walk_state->opcode));
 171
 172
 173         switch (walk_state->opcode) {
 174         case AML_MID_OP:    /* Mid (Source[0], Index[1], Length[2], Result[3]) */
 175
 176                 /*
 177                  * Create the return object.  The Source operand is guaranteed to be
 178                  * either a String or a Buffer, so just use its type.
 179                  */
 180                 return_desc = acpi_ut_create_internal_object (
 181                                   ACPI_GET_OBJECT_TYPE (operand[0]));
 182                 if (!return_desc) {
 183                         status = AE_NO_MEMORY;
 184                         goto cleanup;
 185                 }
 186
 187                 /* Get the Integer values from the objects */
 188
 189                 index = operand[1]->integer.value;
 190                 length = (acpi_size) operand[2]->integer.value;
 191
 192                 /*
 193                  * If the index is beyond the length of the String/Buffer, or if the
 194                  * requested length is zero, return a zero-length String/Buffer
 195                  */
 196                 if (index >= operand[0]->string.length) {
 197                         length = 0;
 198                 }
 199
 200                 /* Truncate request if larger than the actual String/Buffer */
 201
 202                 else if ((index + length) > operand[0]->string.length) {
 203                         length = (acpi_size) operand[0]->string.length -
 204                                          (acpi_size) index;
 205                 }
 206
 207                 /* Strings always have a sub-pointer, not so for buffers */
 208
 209                 switch (ACPI_GET_OBJECT_TYPE (operand[0])) {
 210                 case ACPI_TYPE_STRING:
 211
 212                         /* Always allocate a new buffer for the String */
 213
 214                         buffer = ACPI_MEM_CALLOCATE ((acpi_size) length + 1);
 215                         if (!buffer) {
 216                                 status = AE_NO_MEMORY;
 217                                 goto cleanup;
 218                         }
 219                         break;
 220
 221                 case ACPI_TYPE_BUFFER:
 222
 223                         /* If the requested length is zero, don't allocate a buffer */
 224
 225                         if (length > 0) {
 226                                 /* Allocate a new buffer for the Buffer */
 227
 228                                 buffer = ACPI_MEM_CALLOCATE (length);
 229                                 if (!buffer) {
 230                                         status = AE_NO_MEMORY;
 231                                         goto cleanup;
 232                                 }
 233                         }
 234                         break;
 235
 236                 default:                        /* Should not happen */
 237
 238                         status = AE_AML_OPERAND_TYPE;
 239                         goto cleanup;
 240                 }
 241
 242                 if (length > 0) {
 243                         /* Copy the portion requested */
 244
 245                         ACPI_MEMCPY (buffer, operand[0]->string.pointer + index,
 246                                           length);
 247                 }
 248
 249                 /* Set the length of the new String/Buffer */
 250
 251                 return_desc->string.pointer = buffer;
 252                 return_desc->string.length = (u32) length;
 253
 254                 /* Mark buffer initialized */
 255
 256                 return_desc->buffer.flags |= AOPOBJ_DATA_VALID;
 257                 break;
 258
 259
 260         default:
 261
 262                 ACPI_REPORT_ERROR (("acpi_ex_opcode_3A_0T_0R: Unknown opcode %X\n",
 263                                 walk_state->opcode));
 264                 status = AE_AML_BAD_OPCODE;
 265                 goto cleanup;
 266         }
 267
 268         /* Store the result in the target */
 269
 270         status = acpi_ex_store (return_desc, operand[3], walk_state);
 271
 272 cleanup:
 273
 274         /* Delete return object on error */
 275
 276         if (ACPI_FAILURE (status) || walk_state->result_obj) {
 277                 acpi_ut_remove_reference (return_desc);
 278         }
 279
 280         /* Set the return object and exit */
 281
 282         else {
 283                 walk_state->result_obj = return_desc;
 284         }
 285         return_ACPI_STATUS (status);
 286 }
 287
 288