Logo Search packages:      
Sourcecode: linux version File versions  Download package

exoparg3.c

/******************************************************************************
 *
 * Module Name: exoparg3 - AML execution - opcodes with 3 arguments
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2007, R. Byron Moore
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <acpi/acpi.h>
#include <acpi/acinterp.h>
#include <acpi/acparser.h>
#include <acpi/amlcode.h>

#define _COMPONENT          ACPI_EXECUTER
ACPI_MODULE_NAME("exoparg3")

/*!
 * Naming convention for AML interpreter execution routines.
 *
 * The routines that begin execution of AML opcodes are named with a common
 * convention based upon the number of arguments, the number of target operands,
 * and whether or not a value is returned:
 *
 *      AcpiExOpcode_xA_yT_zR
 *
 * Where:
 *
 * xA - ARGUMENTS:    The number of arguments (input operands) that are
 *                    required for this opcode type (1 through 6 args).
 * yT - TARGETS:      The number of targets (output operands) that are required
 *                    for this opcode type (0, 1, or 2 targets).
 * zR - RETURN VALUE: Indicates whether this opcode type returns a value
 *                    as the function return (0 or 1).
 *
 * The AcpiExOpcode* functions are called via the Dispatcher component with
 * fully resolved operands.
!*/
/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_opcode_3A_0T_0R
 *
 * PARAMETERS:  walk_state          - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute Triadic operator (3 operands)
 *
 ******************************************************************************/
acpi_status acpi_ex_opcode_3A_0T_0R(struct acpi_walk_state *walk_state)
{
      union acpi_operand_object **operand = &walk_state->operands[0];
      struct acpi_signal_fatal_info *fatal;
      acpi_status status = AE_OK;

      ACPI_FUNCTION_TRACE_STR(ex_opcode_3A_0T_0R,
                        acpi_ps_get_opcode_name(walk_state->opcode));

      switch (walk_state->opcode) {
      case AML_FATAL_OP:      /* Fatal (fatal_type fatal_code fatal_arg) */

            ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                          "FatalOp: Type %X Code %X Arg %X <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n",
                          (u32) operand[0]->integer.value,
                          (u32) operand[1]->integer.value,
                          (u32) operand[2]->integer.value));

            fatal = ACPI_ALLOCATE(sizeof(struct acpi_signal_fatal_info));
            if (fatal) {
                  fatal->type = (u32) operand[0]->integer.value;
                  fatal->code = (u32) operand[1]->integer.value;
                  fatal->argument = (u32) operand[2]->integer.value;
            }

            /* Always signal the OS! */

            status = acpi_os_signal(ACPI_SIGNAL_FATAL, fatal);

            /* Might return while OS is shutting down, just continue */

            ACPI_FREE(fatal);
            break;

      default:

            ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
                      walk_state->opcode));
            status = AE_AML_BAD_OPCODE;
            goto cleanup;
      }

      cleanup:

      return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_opcode_3A_1T_1R
 *
 * PARAMETERS:  walk_state          - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute Triadic operator (3 operands)
 *
 ******************************************************************************/

acpi_status acpi_ex_opcode_3A_1T_1R(struct acpi_walk_state *walk_state)
{
      union acpi_operand_object **operand = &walk_state->operands[0];
      union acpi_operand_object *return_desc = NULL;
      char *buffer = NULL;
      acpi_status status = AE_OK;
      acpi_integer index;
      acpi_size length;

      ACPI_FUNCTION_TRACE_STR(ex_opcode_3A_1T_1R,
                        acpi_ps_get_opcode_name(walk_state->opcode));

      switch (walk_state->opcode) {
      case AML_MID_OP:  /* Mid (Source[0], Index[1], Length[2], Result[3]) */

            /*
             * Create the return object.  The Source operand is guaranteed to be
             * either a String or a Buffer, so just use its type.
             */
            return_desc =
                acpi_ut_create_internal_object(ACPI_GET_OBJECT_TYPE
                                       (operand[0]));
            if (!return_desc) {
                  status = AE_NO_MEMORY;
                  goto cleanup;
            }

            /* Get the Integer values from the objects */

            index = operand[1]->integer.value;
            length = (acpi_size) operand[2]->integer.value;

            /*
             * If the index is beyond the length of the String/Buffer, or if the
             * requested length is zero, return a zero-length String/Buffer
             */
            if (index >= operand[0]->string.length) {
                  length = 0;
            }

            /* Truncate request if larger than the actual String/Buffer */

            else if ((index + length) > operand[0]->string.length) {
                  length = (acpi_size) operand[0]->string.length -
                      (acpi_size) index;
            }

            /* Strings always have a sub-pointer, not so for buffers */

            switch (ACPI_GET_OBJECT_TYPE(operand[0])) {
            case ACPI_TYPE_STRING:

                  /* Always allocate a new buffer for the String */

                  buffer = ACPI_ALLOCATE_ZEROED((acpi_size) length + 1);
                  if (!buffer) {
                        status = AE_NO_MEMORY;
                        goto cleanup;
                  }
                  break;

            case ACPI_TYPE_BUFFER:

                  /* If the requested length is zero, don't allocate a buffer */

                  if (length > 0) {

                        /* Allocate a new buffer for the Buffer */

                        buffer = ACPI_ALLOCATE_ZEROED(length);
                        if (!buffer) {
                              status = AE_NO_MEMORY;
                              goto cleanup;
                        }
                  }
                  break;

            default:    /* Should not happen */

                  status = AE_AML_OPERAND_TYPE;
                  goto cleanup;
            }

            if (buffer) {

                  /* We have a buffer, copy the portion requested */

                  ACPI_MEMCPY(buffer, operand[0]->string.pointer + index,
                            length);
            }

            /* Set the length of the new String/Buffer */

            return_desc->string.pointer = buffer;
            return_desc->string.length = (u32) length;

            /* Mark buffer initialized */

            return_desc->buffer.flags |= AOPOBJ_DATA_VALID;
            break;

      default:

            ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
                      walk_state->opcode));
            status = AE_AML_BAD_OPCODE;
            goto cleanup;
      }

      /* Store the result in the target */

      status = acpi_ex_store(return_desc, operand[3], walk_state);

      cleanup:

      /* Delete return object on error */

      if (ACPI_FAILURE(status) || walk_state->result_obj) {
            acpi_ut_remove_reference(return_desc);
      }

      /* Set the return object and exit */

      else {
            walk_state->result_obj = return_desc;
      }
      return_ACPI_STATUS(status);
}

Generated by  Doxygen 1.6.0   Back to index