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exoparg2.c

/******************************************************************************
 *
 * Module Name: exoparg2 - AML execution - opcodes with 2 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/acparser.h>
#include <acpi/acinterp.h>
#include <acpi/acevents.h>
#include <acpi/amlcode.h>

#define _COMPONENT          ACPI_EXECUTER
ACPI_MODULE_NAME("exoparg2")

/*!
 * 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_2A_0T_0R
 *
 * PARAMETERS:  walk_state          - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute opcode with two arguments, no target, and no return
 *              value.
 *
 * ALLOCATION:  Deletes both operands
 *
 ******************************************************************************/
acpi_status acpi_ex_opcode_2A_0T_0R(struct acpi_walk_state *walk_state)
{
      union acpi_operand_object **operand = &walk_state->operands[0];
      struct acpi_namespace_node *node;
      u32 value;
      acpi_status status = AE_OK;

      ACPI_FUNCTION_TRACE_STR(ex_opcode_2A_0T_0R,
                        acpi_ps_get_opcode_name(walk_state->opcode));

      /* Examine the opcode */

      switch (walk_state->opcode) {
      case AML_NOTIFY_OP:     /* Notify (notify_object, notify_value) */

            /* The first operand is a namespace node */

            node = (struct acpi_namespace_node *)operand[0];

            /* Second value is the notify value */

            value = (u32) operand[1]->integer.value;

            /* Are notifies allowed on this object? */

            if (!acpi_ev_is_notify_object(node)) {
                  ACPI_ERROR((AE_INFO,
                            "Unexpected notify object type [%s]",
                            acpi_ut_get_type_name(node->type)));

                  status = AE_AML_OPERAND_TYPE;
                  break;
            }
#ifdef ACPI_GPE_NOTIFY_CHECK
            /*
             * GPE method wake/notify check.  Here, we want to ensure that we
             * don't receive any "DeviceWake" Notifies from a GPE _Lxx or _Exx
             * GPE method during system runtime.  If we do, the GPE is marked
             * as "wake-only" and disabled.
             *
             * 1) Is the Notify() value == device_wake?
             * 2) Is this a GPE deferred method?  (An _Lxx or _Exx method)
             * 3) Did the original GPE happen at system runtime?
             *    (versus during wake)
             *
             * If all three cases are true, this is a wake-only GPE that should
             * be disabled at runtime.
             */
            if (value == 2) { /* device_wake */
                  status =
                      acpi_ev_check_for_wake_only_gpe(walk_state->
                                              gpe_event_info);
                  if (ACPI_FAILURE(status)) {

                        /* AE_WAKE_ONLY_GPE only error, means ignore this notify */

                        return_ACPI_STATUS(AE_OK)
                  }
            }
#endif

            /*
             * Dispatch the notify to the appropriate handler
             * NOTE: the request is queued for execution after this method
             * completes.  The notify handlers are NOT invoked synchronously
             * from this thread -- because handlers may in turn run other
             * control methods.
             */
            status = acpi_ev_queue_notify_request(node, value);
            break;

      default:

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

      return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_opcode_2A_2T_1R
 *
 * PARAMETERS:  walk_state          - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute a dyadic operator (2 operands) with 2 output targets
 *              and one implicit return value.
 *
 ******************************************************************************/

acpi_status acpi_ex_opcode_2A_2T_1R(struct acpi_walk_state *walk_state)
{
      union acpi_operand_object **operand = &walk_state->operands[0];
      union acpi_operand_object *return_desc1 = NULL;
      union acpi_operand_object *return_desc2 = NULL;
      acpi_status status;

      ACPI_FUNCTION_TRACE_STR(ex_opcode_2A_2T_1R,
                        acpi_ps_get_opcode_name(walk_state->opcode));

      /* Execute the opcode */

      switch (walk_state->opcode) {
      case AML_DIVIDE_OP:

            /* Divide (Dividend, Divisor, remainder_result quotient_result) */

            return_desc1 =
                acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
            if (!return_desc1) {
                  status = AE_NO_MEMORY;
                  goto cleanup;
            }

            return_desc2 =
                acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
            if (!return_desc2) {
                  status = AE_NO_MEMORY;
                  goto cleanup;
            }

            /* Quotient to return_desc1, remainder to return_desc2 */

            status = acpi_ut_divide(operand[0]->integer.value,
                              operand[1]->integer.value,
                              &return_desc1->integer.value,
                              &return_desc2->integer.value);
            if (ACPI_FAILURE(status)) {
                  goto cleanup;
            }
            break;

      default:

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

      /* Store the results to the target reference operands */

      status = acpi_ex_store(return_desc2, operand[2], walk_state);
      if (ACPI_FAILURE(status)) {
            goto cleanup;
      }

      status = acpi_ex_store(return_desc1, operand[3], walk_state);
      if (ACPI_FAILURE(status)) {
            goto cleanup;
      }

      /* Return the remainder */

      walk_state->result_obj = return_desc1;

      cleanup:
      /*
       * Since the remainder is not returned indirectly, remove a reference to
       * it. Only the quotient is returned indirectly.
       */
      acpi_ut_remove_reference(return_desc2);

      if (ACPI_FAILURE(status)) {

            /* Delete the return object */

            acpi_ut_remove_reference(return_desc1);
      }

      return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_opcode_2A_1T_1R
 *
 * PARAMETERS:  walk_state          - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute opcode with two arguments, one target, and a return
 *              value.
 *
 ******************************************************************************/

acpi_status acpi_ex_opcode_2A_1T_1R(struct acpi_walk_state *walk_state)
{
      union acpi_operand_object **operand = &walk_state->operands[0];
      union acpi_operand_object *return_desc = NULL;
      acpi_integer index;
      acpi_status status = AE_OK;
      acpi_size length;

      ACPI_FUNCTION_TRACE_STR(ex_opcode_2A_1T_1R,
                        acpi_ps_get_opcode_name(walk_state->opcode));

      /* Execute the opcode */

      if (walk_state->op_info->flags & AML_MATH) {

            /* All simple math opcodes (add, etc.) */

            return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
            if (!return_desc) {
                  status = AE_NO_MEMORY;
                  goto cleanup;
            }

            return_desc->integer.value =
                acpi_ex_do_math_op(walk_state->opcode,
                               operand[0]->integer.value,
                               operand[1]->integer.value);
            goto store_result_to_target;
      }

      switch (walk_state->opcode) {
      case AML_MOD_OP:  /* Mod (Dividend, Divisor, remainder_result (ACPI 2.0) */

            return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
            if (!return_desc) {
                  status = AE_NO_MEMORY;
                  goto cleanup;
            }

            /* return_desc will contain the remainder */

            status = acpi_ut_divide(operand[0]->integer.value,
                              operand[1]->integer.value,
                              NULL, &return_desc->integer.value);
            break;

      case AML_CONCAT_OP:     /* Concatenate (Data1, Data2, Result) */

            status = acpi_ex_do_concatenate(operand[0], operand[1],
                                    &return_desc, walk_state);
            break;

      case AML_TO_STRING_OP:  /* to_string (Buffer, Length, Result) (ACPI 2.0) */

            /*
             * Input object is guaranteed to be a buffer at this point (it may have
             * been converted.)  Copy the raw buffer data to a new object of
             * type String.
             */

            /*
             * Get the length of the new string. It is the smallest of:
             * 1) Length of the input buffer
             * 2) Max length as specified in the to_string operator
             * 3) Length of input buffer up to a zero byte (null terminator)
             *
             * NOTE: A length of zero is ok, and will create a zero-length, null
             *       terminated string.
             */
            length = 0;
            while ((length < operand[0]->buffer.length) &&
                   (length < operand[1]->integer.value) &&
                   (operand[0]->buffer.pointer[length])) {
                  length++;
            }

            /* Allocate a new string object */

            return_desc = acpi_ut_create_string_object(length);
            if (!return_desc) {
                  status = AE_NO_MEMORY;
                  goto cleanup;
            }

            /*
             * Copy the raw buffer data with no transform.
             * (NULL terminated already)
             */
            ACPI_MEMCPY(return_desc->string.pointer,
                      operand[0]->buffer.pointer, length);
            break;

      case AML_CONCAT_RES_OP:

            /* concatenate_res_template (Buffer, Buffer, Result) (ACPI 2.0) */

            status = acpi_ex_concat_template(operand[0], operand[1],
                                     &return_desc, walk_state);
            break;

      case AML_INDEX_OP:      /* Index (Source Index Result) */

            /* Create the internal return object */

            return_desc =
                acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
            if (!return_desc) {
                  status = AE_NO_MEMORY;
                  goto cleanup;
            }

            /* Initialize the Index reference object */

            index = operand[1]->integer.value;
            return_desc->reference.offset = (u32) index;
            return_desc->reference.opcode = AML_INDEX_OP;

            /*
             * At this point, the Source operand is a String, Buffer, or Package.
             * Verify that the index is within range.
             */
            switch (ACPI_GET_OBJECT_TYPE(operand[0])) {
            case ACPI_TYPE_STRING:

                  if (index >= operand[0]->string.length) {
                        status = AE_AML_STRING_LIMIT;
                  }

                  return_desc->reference.target_type =
                      ACPI_TYPE_BUFFER_FIELD;
                  break;

            case ACPI_TYPE_BUFFER:

                  if (index >= operand[0]->buffer.length) {
                        status = AE_AML_BUFFER_LIMIT;
                  }

                  return_desc->reference.target_type =
                      ACPI_TYPE_BUFFER_FIELD;
                  break;

            case ACPI_TYPE_PACKAGE:

                  if (index >= operand[0]->package.count) {
                        status = AE_AML_PACKAGE_LIMIT;
                  }

                  return_desc->reference.target_type = ACPI_TYPE_PACKAGE;
                  return_desc->reference.where =
                      &operand[0]->package.elements[index];
                  break;

            default:

                  status = AE_AML_INTERNAL;
                  goto cleanup;
            }

            /* Failure means that the Index was beyond the end of the object */

            if (ACPI_FAILURE(status)) {
                  ACPI_EXCEPTION((AE_INFO, status,
                              "Index (%X%8.8X) is beyond end of object",
                              ACPI_FORMAT_UINT64(index)));
                  goto cleanup;
            }

            /*
             * Save the target object and add a reference to it for the life
             * of the index
             */
            return_desc->reference.object = operand[0];
            acpi_ut_add_reference(operand[0]);

            /* Store the reference to the Target */

            status = acpi_ex_store(return_desc, operand[2], walk_state);

            /* Return the reference */

            walk_state->result_obj = return_desc;
            goto cleanup;

      default:

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

      store_result_to_target:

      if (ACPI_SUCCESS(status)) {
            /*
             * Store the result of the operation (which is now in return_desc) into
             * the Target descriptor.
             */
            status = acpi_ex_store(return_desc, operand[2], walk_state);
            if (ACPI_FAILURE(status)) {
                  goto cleanup;
            }

            if (!walk_state->result_obj) {
                  walk_state->result_obj = return_desc;
            }
      }

      cleanup:

      /* Delete return object on error */

      if (ACPI_FAILURE(status)) {
            acpi_ut_remove_reference(return_desc);
      }

      return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_opcode_2A_0T_1R
 *
 * PARAMETERS:  walk_state          - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute opcode with 2 arguments, no target, and a return value
 *
 ******************************************************************************/

acpi_status acpi_ex_opcode_2A_0T_1R(struct acpi_walk_state *walk_state)
{
      union acpi_operand_object **operand = &walk_state->operands[0];
      union acpi_operand_object *return_desc = NULL;
      acpi_status status = AE_OK;
      u8 logical_result = FALSE;

      ACPI_FUNCTION_TRACE_STR(ex_opcode_2A_0T_1R,
                        acpi_ps_get_opcode_name(walk_state->opcode));

      /* Create the internal return object */

      return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
      if (!return_desc) {
            status = AE_NO_MEMORY;
            goto cleanup;
      }

      /* Execute the Opcode */

      if (walk_state->op_info->flags & AML_LOGICAL_NUMERIC) {

            /* logical_op (Operand0, Operand1) */

            status = acpi_ex_do_logical_numeric_op(walk_state->opcode,
                                           operand[0]->integer.
                                           value,
                                           operand[1]->integer.
                                           value, &logical_result);
            goto store_logical_result;
      } else if (walk_state->op_info->flags & AML_LOGICAL) {

            /* logical_op (Operand0, Operand1) */

            status = acpi_ex_do_logical_op(walk_state->opcode, operand[0],
                                     operand[1], &logical_result);
            goto store_logical_result;
      }

      switch (walk_state->opcode) {
      case AML_ACQUIRE_OP:    /* Acquire (mutex_object, Timeout) */

            status =
                acpi_ex_acquire_mutex(operand[1], operand[0], walk_state);
            if (status == AE_TIME) {
                  logical_result = TRUE;  /* TRUE = Acquire timed out */
                  status = AE_OK;
            }
            break;

      case AML_WAIT_OP: /* Wait (event_object, Timeout) */

            status = acpi_ex_system_wait_event(operand[1], operand[0]);
            if (status == AE_TIME) {
                  logical_result = TRUE;  /* TRUE, Wait timed out */
                  status = AE_OK;
            }
            break;

      default:

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

      store_logical_result:
      /*
       * Set return value to according to logical_result. logical TRUE (all ones)
       * Default is FALSE (zero)
       */
      if (logical_result) {
            return_desc->integer.value = ACPI_INTEGER_MAX;
      }

      walk_state->result_obj = return_desc;

      cleanup:

      /* Delete return object on error */

      if (ACPI_FAILURE(status)) {
            acpi_ut_remove_reference(return_desc);
      }

      return_ACPI_STATUS(status);
}

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