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exoparg1.c

/******************************************************************************
 *
 * Module Name: exoparg1 - AML execution - opcodes with 1 argument
 *
 *****************************************************************************/

/*
 * 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/acdispat.h>
#include <acpi/acinterp.h>
#include <acpi/amlcode.h>
#include <acpi/acnamesp.h>

#define _COMPONENT          ACPI_EXECUTER
ACPI_MODULE_NAME("exoparg1")

/*!
 * 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 (0 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_0A_0T_1R
 *
 * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute operator with no operands, one return value
 *
 ******************************************************************************/
acpi_status acpi_ex_opcode_0A_0T_1R(struct acpi_walk_state *walk_state)
{
      acpi_status status = AE_OK;
      union acpi_operand_object *return_desc = NULL;

      ACPI_FUNCTION_TRACE_STR(ex_opcode_0A_0T_1R,
                        acpi_ps_get_opcode_name(walk_state->opcode));

      /* Examine the AML opcode */

      switch (walk_state->opcode) {
      case AML_TIMER_OP:      /*  Timer () */

            /* Create a return object of type Integer */

            return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
            if (!return_desc) {
                  status = AE_NO_MEMORY;
                  goto cleanup;
            }
            return_desc->integer.value = acpi_os_get_timer();
            break;

      default:          /*  Unknown opcode  */

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

      cleanup:

      /* Delete return object on error */

      if ((ACPI_FAILURE(status)) || walk_state->result_obj) {
            acpi_ut_remove_reference(return_desc);
      } else {
            /* Save the return value */

            walk_state->result_obj = return_desc;
      }

      return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_opcode_1A_0T_0R
 *
 * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute Type 1 monadic operator with numeric operand on
 *              object stack
 *
 ******************************************************************************/

acpi_status acpi_ex_opcode_1A_0T_0R(struct acpi_walk_state *walk_state)
{
      union acpi_operand_object **operand = &walk_state->operands[0];
      acpi_status status = AE_OK;

      ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_0R,
                        acpi_ps_get_opcode_name(walk_state->opcode));

      /* Examine the AML opcode */

      switch (walk_state->opcode) {
      case AML_RELEASE_OP:    /*  Release (mutex_object) */

            status = acpi_ex_release_mutex(operand[0], walk_state);
            break;

      case AML_RESET_OP:      /*  Reset (event_object) */

            status = acpi_ex_system_reset_event(operand[0]);
            break;

      case AML_SIGNAL_OP:     /*  Signal (event_object) */

            status = acpi_ex_system_signal_event(operand[0]);
            break;

      case AML_SLEEP_OP:      /*  Sleep (msec_time) */

            status = acpi_ex_system_do_suspend(operand[0]->integer.value);
            break;

      case AML_STALL_OP:      /*  Stall (usec_time) */

            status =
                acpi_ex_system_do_stall((u32) operand[0]->integer.value);
            break;

      case AML_UNLOAD_OP:     /*  Unload (Handle) */

            status = acpi_ex_unload_table(operand[0]);
            break;

      default:          /*  Unknown opcode  */

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

      return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_opcode_1A_1T_0R
 *
 * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute opcode with one argument, one target, and no
 *              return value.
 *
 ******************************************************************************/

acpi_status acpi_ex_opcode_1A_1T_0R(struct acpi_walk_state *walk_state)
{
      acpi_status status = AE_OK;
      union acpi_operand_object **operand = &walk_state->operands[0];

      ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_0R,
                        acpi_ps_get_opcode_name(walk_state->opcode));

      /* Examine the AML opcode */

      switch (walk_state->opcode) {
      case AML_LOAD_OP:

            status = acpi_ex_load_op(operand[0], operand[1], walk_state);
            break;

      default:          /* Unknown opcode */

            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_1A_1T_1R
 *
 * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute opcode with one argument, one target, and a
 *              return value.
 *
 ******************************************************************************/

acpi_status acpi_ex_opcode_1A_1T_1R(struct acpi_walk_state *walk_state)
{
      acpi_status status = AE_OK;
      union acpi_operand_object **operand = &walk_state->operands[0];
      union acpi_operand_object *return_desc = NULL;
      union acpi_operand_object *return_desc2 = NULL;
      u32 temp32;
      u32 i;
      acpi_integer power_of_ten;
      acpi_integer digit;

      ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_1T_1R,
                        acpi_ps_get_opcode_name(walk_state->opcode));

      /* Examine the AML opcode */

      switch (walk_state->opcode) {
      case AML_BIT_NOT_OP:
      case AML_FIND_SET_LEFT_BIT_OP:
      case AML_FIND_SET_RIGHT_BIT_OP:
      case AML_FROM_BCD_OP:
      case AML_TO_BCD_OP:
      case AML_COND_REF_OF_OP:

            /* Create a return object of type Integer for these opcodes */

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

            switch (walk_state->opcode) {
            case AML_BIT_NOT_OP:    /* Not (Operand, Result)  */

                  return_desc->integer.value = ~operand[0]->integer.value;
                  break;

            case AML_FIND_SET_LEFT_BIT_OP:      /* find_set_left_bit (Operand, Result) */

                  return_desc->integer.value = operand[0]->integer.value;

                  /*
                   * Acpi specification describes Integer type as a little
                   * endian unsigned value, so this boundary condition is valid.
                   */
                  for (temp32 = 0; return_desc->integer.value &&
                       temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
                        return_desc->integer.value >>= 1;
                  }

                  return_desc->integer.value = temp32;
                  break;

            case AML_FIND_SET_RIGHT_BIT_OP:     /* find_set_right_bit (Operand, Result) */

                  return_desc->integer.value = operand[0]->integer.value;

                  /*
                   * The Acpi specification describes Integer type as a little
                   * endian unsigned value, so this boundary condition is valid.
                   */
                  for (temp32 = 0; return_desc->integer.value &&
                       temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) {
                        return_desc->integer.value <<= 1;
                  }

                  /* Since the bit position is one-based, subtract from 33 (65) */

                  return_desc->integer.value =
                      temp32 ==
                      0 ? 0 : (ACPI_INTEGER_BIT_SIZE + 1) - temp32;
                  break;

            case AML_FROM_BCD_OP:   /* from_bcd (BCDValue, Result) */

                  /*
                   * The 64-bit ACPI integer can hold 16 4-bit BCD characters
                   * (if table is 32-bit, integer can hold 8 BCD characters)
                   * Convert each 4-bit BCD value
                   */
                  power_of_ten = 1;
                  return_desc->integer.value = 0;
                  digit = operand[0]->integer.value;

                  /* Convert each BCD digit (each is one nybble wide) */

                  for (i = 0;
                       (i < acpi_gbl_integer_nybble_width) && (digit > 0);
                       i++) {

                        /* Get the least significant 4-bit BCD digit */

                        temp32 = ((u32) digit) & 0xF;

                        /* Check the range of the digit */

                        if (temp32 > 9) {
                              ACPI_ERROR((AE_INFO,
                                        "BCD digit too large (not decimal): 0x%X",
                                        temp32));

                              status = AE_AML_NUMERIC_OVERFLOW;
                              goto cleanup;
                        }

                        /* Sum the digit into the result with the current power of 10 */

                        return_desc->integer.value +=
                            (((acpi_integer) temp32) * power_of_ten);

                        /* Shift to next BCD digit */

                        digit >>= 4;

                        /* Next power of 10 */

                        power_of_ten *= 10;
                  }
                  break;

            case AML_TO_BCD_OP:     /* to_bcd (Operand, Result) */

                  return_desc->integer.value = 0;
                  digit = operand[0]->integer.value;

                  /* Each BCD digit is one nybble wide */

                  for (i = 0;
                       (i < acpi_gbl_integer_nybble_width) && (digit > 0);
                       i++) {
                        (void)acpi_ut_short_divide(digit, 10, &digit,
                                             &temp32);

                        /*
                         * Insert the BCD digit that resides in the
                         * remainder from above
                         */
                        return_desc->integer.value |=
                            (((acpi_integer) temp32) << ACPI_MUL_4(i));
                  }

                  /* Overflow if there is any data left in Digit */

                  if (digit > 0) {
                        ACPI_ERROR((AE_INFO,
                                  "Integer too large to convert to BCD: %8.8X%8.8X",
                                  ACPI_FORMAT_UINT64(operand[0]->
                                                 integer.value)));
                        status = AE_AML_NUMERIC_OVERFLOW;
                        goto cleanup;
                  }
                  break;

            case AML_COND_REF_OF_OP:      /* cond_ref_of (source_object, Result) */

                  /*
                   * This op is a little strange because the internal return value is
                   * different than the return value stored in the result descriptor
                   * (There are really two return values)
                   */
                  if ((struct acpi_namespace_node *)operand[0] ==
                      acpi_gbl_root_node) {
                        /*
                         * This means that the object does not exist in the namespace,
                         * return FALSE
                         */
                        return_desc->integer.value = 0;
                        goto cleanup;
                  }

                  /* Get the object reference, store it, and remove our reference */

                  status = acpi_ex_get_object_reference(operand[0],
                                                &return_desc2,
                                                walk_state);
                  if (ACPI_FAILURE(status)) {
                        goto cleanup;
                  }

                  status =
                      acpi_ex_store(return_desc2, operand[1], walk_state);
                  acpi_ut_remove_reference(return_desc2);

                  /* The object exists in the namespace, return TRUE */

                  return_desc->integer.value = ACPI_INTEGER_MAX;
                  goto cleanup;

            default:
                  /* No other opcodes get here */
                  break;
            }
            break;

      case AML_STORE_OP:      /* Store (Source, Target) */

            /*
             * A store operand is typically a number, string, buffer or lvalue
             * Be careful about deleting the source object,
             * since the object itself may have been stored.
             */
            status = acpi_ex_store(operand[0], operand[1], walk_state);
            if (ACPI_FAILURE(status)) {
                  return_ACPI_STATUS(status);
            }

            /* It is possible that the Store already produced a return object */

            if (!walk_state->result_obj) {
                  /*
                   * Normally, we would remove a reference on the Operand[0]
                   * parameter; But since it is being used as the internal return
                   * object (meaning we would normally increment it), the two
                   * cancel out, and we simply don't do anything.
                   */
                  walk_state->result_obj = operand[0];
                  walk_state->operands[0] = NULL;     /* Prevent deletion */
            }
            return_ACPI_STATUS(status);

            /*
             * ACPI 2.0 Opcodes
             */
      case AML_COPY_OP: /* Copy (Source, Target) */

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

      case AML_TO_DECSTRING_OP:     /* to_decimal_string (Data, Result) */

            status = acpi_ex_convert_to_string(operand[0], &return_desc,
                                       ACPI_EXPLICIT_CONVERT_DECIMAL);
            if (return_desc == operand[0]) {

                  /* No conversion performed, add ref to handle return value */
                  acpi_ut_add_reference(return_desc);
            }
            break;

      case AML_TO_HEXSTRING_OP:     /* to_hex_string (Data, Result) */

            status = acpi_ex_convert_to_string(operand[0], &return_desc,
                                       ACPI_EXPLICIT_CONVERT_HEX);
            if (return_desc == operand[0]) {

                  /* No conversion performed, add ref to handle return value */
                  acpi_ut_add_reference(return_desc);
            }
            break;

      case AML_TO_BUFFER_OP:  /* to_buffer (Data, Result) */

            status = acpi_ex_convert_to_buffer(operand[0], &return_desc);
            if (return_desc == operand[0]) {

                  /* No conversion performed, add ref to handle return value */
                  acpi_ut_add_reference(return_desc);
            }
            break;

      case AML_TO_INTEGER_OP: /* to_integer (Data, Result) */

            status = acpi_ex_convert_to_integer(operand[0], &return_desc,
                                        ACPI_ANY_BASE);
            if (return_desc == operand[0]) {

                  /* No conversion performed, add ref to handle return value */
                  acpi_ut_add_reference(return_desc);
            }
            break;

      case AML_SHIFT_LEFT_BIT_OP:   /* shift_left_bit (Source, bit_num) */
      case AML_SHIFT_RIGHT_BIT_OP:  /* shift_right_bit (Source, bit_num) */

            /* These are two obsolete opcodes */

            ACPI_ERROR((AE_INFO,
                      "%s is obsolete and not implemented",
                      acpi_ps_get_opcode_name(walk_state->opcode)));
            status = AE_SUPPORT;
            goto cleanup;

      default:          /* Unknown opcode */

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

      if (ACPI_SUCCESS(status)) {

            /* Store the return value computed above into the target object */

            status = acpi_ex_store(return_desc, operand[1], walk_state);
      }

      cleanup:

      /* Delete return object on error */

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

      /* Save return object on success */

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

      return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_opcode_1A_0T_1R
 *
 * PARAMETERS:  walk_state          - Current state (contains AML opcode)
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute opcode with one argument, no target, and a return value
 *
 ******************************************************************************/

acpi_status acpi_ex_opcode_1A_0T_1R(struct acpi_walk_state *walk_state)
{
      union acpi_operand_object **operand = &walk_state->operands[0];
      union acpi_operand_object *temp_desc;
      union acpi_operand_object *return_desc = NULL;
      acpi_status status = AE_OK;
      u32 type;
      acpi_integer value;

      ACPI_FUNCTION_TRACE_STR(ex_opcode_1A_0T_1R,
                        acpi_ps_get_opcode_name(walk_state->opcode));

      /* Examine the AML opcode */

      switch (walk_state->opcode) {
      case AML_LNOT_OP: /* LNot (Operand) */

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

            /*
             * Set result to ONES (TRUE) if Value == 0.  Note:
             * return_desc->Integer.Value is initially == 0 (FALSE) from above.
             */
            if (!operand[0]->integer.value) {
                  return_desc->integer.value = ACPI_INTEGER_MAX;
            }
            break;

      case AML_DECREMENT_OP:  /* Decrement (Operand)  */
      case AML_INCREMENT_OP:  /* Increment (Operand)  */

            /*
             * Create a new integer.  Can't just get the base integer and
             * increment it because it may be an Arg or Field.
             */
            return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
            if (!return_desc) {
                  status = AE_NO_MEMORY;
                  goto cleanup;
            }

            /*
             * Since we are expecting a Reference operand, it can be either a
             * NS Node or an internal object.
             */
            temp_desc = operand[0];
            if (ACPI_GET_DESCRIPTOR_TYPE(temp_desc) ==
                ACPI_DESC_TYPE_OPERAND) {

                  /* Internal reference object - prevent deletion */

                  acpi_ut_add_reference(temp_desc);
            }

            /*
             * Convert the Reference operand to an Integer (This removes a
             * reference on the Operand[0] object)
             *
             * NOTE:  We use LNOT_OP here in order to force resolution of the
             * reference operand to an actual integer.
             */
            status =
                acpi_ex_resolve_operands(AML_LNOT_OP, &temp_desc,
                                   walk_state);
            if (ACPI_FAILURE(status)) {
                  ACPI_EXCEPTION((AE_INFO, status,
                              "While resolving operands for [%s]",
                              acpi_ps_get_opcode_name(walk_state->
                                                opcode)));

                  goto cleanup;
            }

            /*
             * temp_desc is now guaranteed to be an Integer object --
             * Perform the actual increment or decrement
             */
            if (walk_state->opcode == AML_INCREMENT_OP) {
                  return_desc->integer.value =
                      temp_desc->integer.value + 1;
            } else {
                  return_desc->integer.value =
                      temp_desc->integer.value - 1;
            }

            /* Finished with this Integer object */

            acpi_ut_remove_reference(temp_desc);

            /*
             * Store the result back (indirectly) through the original
             * Reference object
             */
            status = acpi_ex_store(return_desc, operand[0], walk_state);
            break;

      case AML_TYPE_OP: /* object_type (source_object) */

            /*
             * Note: The operand is not resolved at this point because we want to
             * get the associated object, not its value.  For example, we don't
             * want to resolve a field_unit to its value, we want the actual
             * field_unit object.
             */

            /* Get the type of the base object */

            status =
                acpi_ex_resolve_multiple(walk_state, operand[0], &type,
                                   NULL);
            if (ACPI_FAILURE(status)) {
                  goto cleanup;
            }

            /* Allocate a descriptor to hold the type. */

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

            return_desc->integer.value = type;
            break;

      case AML_SIZE_OF_OP:    /* size_of (source_object) */

            /*
             * Note: The operand is not resolved at this point because we want to
             * get the associated object, not its value.
             */

            /* Get the base object */

            status = acpi_ex_resolve_multiple(walk_state,
                                      operand[0], &type,
                                      &temp_desc);
            if (ACPI_FAILURE(status)) {
                  goto cleanup;
            }

            /*
             * The type of the base object must be integer, buffer, string, or
             * package.  All others are not supported.
             *
             * NOTE: Integer is not specifically supported by the ACPI spec,
             * but is supported implicitly via implicit operand conversion.
             * rather than bother with conversion, we just use the byte width
             * global (4 or 8 bytes).
             */
            switch (type) {
            case ACPI_TYPE_INTEGER:
                  value = acpi_gbl_integer_byte_width;
                  break;

            case ACPI_TYPE_BUFFER:
                  value = temp_desc->buffer.length;
                  break;

            case ACPI_TYPE_STRING:
                  value = temp_desc->string.length;
                  break;

            case ACPI_TYPE_PACKAGE:
                  value = temp_desc->package.count;
                  break;

            default:
                  ACPI_ERROR((AE_INFO,
                            "Operand is not Buf/Int/Str/Pkg - found type %s",
                            acpi_ut_get_type_name(type)));
                  status = AE_AML_OPERAND_TYPE;
                  goto cleanup;
            }

            /*
             * Now that we have the size of the object, create a result
             * object to hold the value
             */
            return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
            if (!return_desc) {
                  status = AE_NO_MEMORY;
                  goto cleanup;
            }

            return_desc->integer.value = value;
            break;

      case AML_REF_OF_OP:     /* ref_of (source_object) */

            status =
                acpi_ex_get_object_reference(operand[0], &return_desc,
                                     walk_state);
            if (ACPI_FAILURE(status)) {
                  goto cleanup;
            }
            break;

      case AML_DEREF_OF_OP:   /* deref_of (obj_reference | String) */

            /* Check for a method local or argument, or standalone String */

            if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
                ACPI_DESC_TYPE_NAMED) {
                  temp_desc =
                      acpi_ns_get_attached_object((struct
                                           acpi_namespace_node *)
                                          operand[0]);
                  if (temp_desc
                      &&
                      ((ACPI_GET_OBJECT_TYPE(temp_desc) ==
                        ACPI_TYPE_STRING)
                       || (ACPI_GET_OBJECT_TYPE(temp_desc) ==
                         ACPI_TYPE_LOCAL_REFERENCE))) {
                        operand[0] = temp_desc;
                        acpi_ut_add_reference(temp_desc);
                  } else {
                        status = AE_AML_OPERAND_TYPE;
                        goto cleanup;
                  }
            } else {
                  switch (ACPI_GET_OBJECT_TYPE(operand[0])) {
                  case ACPI_TYPE_LOCAL_REFERENCE:
                        /*
                         * This is a deref_of (local_x | arg_x)
                         *
                         * Must resolve/dereference the local/arg reference first
                         */
                        switch (operand[0]->reference.opcode) {
                        case AML_LOCAL_OP:
                        case AML_ARG_OP:

                              /* Set Operand[0] to the value of the local/arg */

                              status =
                                  acpi_ds_method_data_get_value
                                  (operand[0]->reference.opcode,
                                   operand[0]->reference.offset,
                                   walk_state, &temp_desc);
                              if (ACPI_FAILURE(status)) {
                                    goto cleanup;
                              }

                              /*
                               * Delete our reference to the input object and
                               * point to the object just retrieved
                               */
                              acpi_ut_remove_reference(operand[0]);
                              operand[0] = temp_desc;
                              break;

                        case AML_REF_OF_OP:

                              /* Get the object to which the reference refers */

                              temp_desc =
                                  operand[0]->reference.object;
                              acpi_ut_remove_reference(operand[0]);
                              operand[0] = temp_desc;
                              break;

                        default:

                              /* Must be an Index op - handled below */
                              break;
                        }
                        break;

                  case ACPI_TYPE_STRING:
                        break;

                  default:
                        status = AE_AML_OPERAND_TYPE;
                        goto cleanup;
                  }
            }

            if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) !=
                ACPI_DESC_TYPE_NAMED) {
                  if (ACPI_GET_OBJECT_TYPE(operand[0]) ==
                      ACPI_TYPE_STRING) {
                        /*
                         * This is a deref_of (String). The string is a reference
                         * to a named ACPI object.
                         *
                         * 1) Find the owning Node
                         * 2) Dereference the node to an actual object. Could be a
                         *    Field, so we need to resolve the node to a value.
                         */
                        status =
                            acpi_ns_get_node(walk_state->scope_info->
                                         scope.node,
                                         operand[0]->string.pointer,
                                         ACPI_NS_SEARCH_PARENT,
                                         ACPI_CAST_INDIRECT_PTR
                                         (struct
                                          acpi_namespace_node,
                                          &return_desc));
                        if (ACPI_FAILURE(status)) {
                              goto cleanup;
                        }

                        status =
                            acpi_ex_resolve_node_to_value
                            (ACPI_CAST_INDIRECT_PTR
                             (struct acpi_namespace_node, &return_desc),
                             walk_state);
                        goto cleanup;
                  }
            }

            /* Operand[0] may have changed from the code above */

            if (ACPI_GET_DESCRIPTOR_TYPE(operand[0]) ==
                ACPI_DESC_TYPE_NAMED) {
                  /*
                   * This is a deref_of (object_reference)
                   * Get the actual object from the Node (This is the dereference).
                   * This case may only happen when a local_x or arg_x is
                   * dereferenced above.
                   */
                  return_desc = acpi_ns_get_attached_object((struct
                                                   acpi_namespace_node
                                                   *)
                                                  operand[0]);
                  acpi_ut_add_reference(return_desc);
            } else {
                  /*
                   * This must be a reference object produced by either the
                   * Index() or ref_of() operator
                   */
                  switch (operand[0]->reference.opcode) {
                  case AML_INDEX_OP:

                        /*
                         * The target type for the Index operator must be
                         * either a Buffer or a Package
                         */
                        switch (operand[0]->reference.target_type) {
                        case ACPI_TYPE_BUFFER_FIELD:

                              temp_desc =
                                  operand[0]->reference.object;

                              /*
                               * Create a new object that contains one element of the
                               * buffer -- the element pointed to by the index.
                               *
                               * NOTE: index into a buffer is NOT a pointer to a
                               * sub-buffer of the main buffer, it is only a pointer to a
                               * single element (byte) of the buffer!
                               */
                              return_desc =
                                  acpi_ut_create_internal_object
                                  (ACPI_TYPE_INTEGER);
                              if (!return_desc) {
                                    status = AE_NO_MEMORY;
                                    goto cleanup;
                              }

                              /*
                               * Since we are returning the value of the buffer at the
                               * indexed location, we don't need to add an additional
                               * reference to the buffer itself.
                               */
                              return_desc->integer.value =
                                  temp_desc->buffer.
                                  pointer[operand[0]->reference.
                                        offset];
                              break;

                        case ACPI_TYPE_PACKAGE:

                              /*
                               * Return the referenced element of the package.  We must
                               * add another reference to the referenced object, however.
                               */
                              return_desc =
                                  *(operand[0]->reference.where);
                              if (return_desc) {
                                    acpi_ut_add_reference
                                        (return_desc);
                              }
                              break;

                        default:

                              ACPI_ERROR((AE_INFO,
                                        "Unknown Index TargetType %X in obj %p",
                                        operand[0]->reference.
                                        target_type, operand[0]));
                              status = AE_AML_OPERAND_TYPE;
                              goto cleanup;
                        }
                        break;

                  case AML_REF_OF_OP:

                        return_desc = operand[0]->reference.object;

                        if (ACPI_GET_DESCRIPTOR_TYPE(return_desc) ==
                            ACPI_DESC_TYPE_NAMED) {
                              return_desc =
                                  acpi_ns_get_attached_object((struct
                                                       acpi_namespace_node
                                                       *)
                                                      return_desc);
                        }

                        /* Add another reference to the object! */

                        acpi_ut_add_reference(return_desc);
                        break;

                  default:
                        ACPI_ERROR((AE_INFO,
                                  "Unknown opcode in reference(%p) - %X",
                                  operand[0],
                                  operand[0]->reference.opcode));

                        status = AE_TYPE;
                        goto cleanup;
                  }
            }
            break;

      default:

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

      cleanup:

      /* Delete return object on error */

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

      /* Save return object on success */

      else {
            walk_state->result_obj = return_desc;
      }

      return_ACPI_STATUS(status);
}

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