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dsopcode.c

/******************************************************************************
 *
 * Module Name: dsopcode - Dispatcher Op Region support and handling of
 *                         "control" opcodes
 *
 *****************************************************************************/

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

#define _COMPONENT          ACPI_DISPATCHER
ACPI_MODULE_NAME("dsopcode")

/* Local prototypes */
static acpi_status
acpi_ds_execute_arguments(struct acpi_namespace_node *node,
                    struct acpi_namespace_node *scope_node,
                    u32 aml_length, u8 * aml_start);

static acpi_status
acpi_ds_init_buffer_field(u16 aml_opcode,
                    union acpi_operand_object *obj_desc,
                    union acpi_operand_object *buffer_desc,
                    union acpi_operand_object *offset_desc,
                    union acpi_operand_object *length_desc,
                    union acpi_operand_object *result_desc);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_execute_arguments
 *
 * PARAMETERS:  Node                - Object NS node
 *              scope_node          - Parent NS node
 *              aml_length          - Length of executable AML
 *              aml_start           - Pointer to the AML
 *
 * RETURN:      Status.
 *
 * DESCRIPTION: Late (deferred) execution of region or field arguments
 *
 ******************************************************************************/

static acpi_status
acpi_ds_execute_arguments(struct acpi_namespace_node *node,
                    struct acpi_namespace_node *scope_node,
                    u32 aml_length, u8 * aml_start)
{
      acpi_status status;
      union acpi_parse_object *op;
      struct acpi_walk_state *walk_state;

      ACPI_FUNCTION_TRACE(ds_execute_arguments);

      /*
       * Allocate a new parser op to be the root of the parsed tree
       */
      op = acpi_ps_alloc_op(AML_INT_EVAL_SUBTREE_OP);
      if (!op) {
            return_ACPI_STATUS(AE_NO_MEMORY);
      }

      /* Save the Node for use in acpi_ps_parse_aml */

      op->common.node = scope_node;

      /* Create and initialize a new parser state */

      walk_state = acpi_ds_create_walk_state(0, NULL, NULL, NULL);
      if (!walk_state) {
            status = AE_NO_MEMORY;
            goto cleanup;
      }

      status = acpi_ds_init_aml_walk(walk_state, op, NULL, aml_start,
                               aml_length, NULL, ACPI_IMODE_LOAD_PASS1);
      if (ACPI_FAILURE(status)) {
            acpi_ds_delete_walk_state(walk_state);
            goto cleanup;
      }

      /* Mark this parse as a deferred opcode */

      walk_state->parse_flags = ACPI_PARSE_DEFERRED_OP;
      walk_state->deferred_node = node;

      /* Pass1: Parse the entire declaration */

      status = acpi_ps_parse_aml(walk_state);
      if (ACPI_FAILURE(status)) {
            goto cleanup;
      }

      /* Get and init the Op created above */

      op->common.node = node;
      acpi_ps_delete_parse_tree(op);

      /* Evaluate the deferred arguments */

      op = acpi_ps_alloc_op(AML_INT_EVAL_SUBTREE_OP);
      if (!op) {
            return_ACPI_STATUS(AE_NO_MEMORY);
      }

      op->common.node = scope_node;

      /* Create and initialize a new parser state */

      walk_state = acpi_ds_create_walk_state(0, NULL, NULL, NULL);
      if (!walk_state) {
            status = AE_NO_MEMORY;
            goto cleanup;
      }

      /* Execute the opcode and arguments */

      status = acpi_ds_init_aml_walk(walk_state, op, NULL, aml_start,
                               aml_length, NULL, ACPI_IMODE_EXECUTE);
      if (ACPI_FAILURE(status)) {
            acpi_ds_delete_walk_state(walk_state);
            goto cleanup;
      }

      /* Mark this execution as a deferred opcode */

      walk_state->deferred_node = node;
      status = acpi_ps_parse_aml(walk_state);

      cleanup:
      acpi_ps_delete_parse_tree(op);
      return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_get_buffer_field_arguments
 *
 * PARAMETERS:  obj_desc        - A valid buffer_field object
 *
 * RETURN:      Status.
 *
 * DESCRIPTION: Get buffer_field Buffer and Index. This implements the late
 *              evaluation of these field attributes.
 *
 ******************************************************************************/

acpi_status
acpi_ds_get_buffer_field_arguments(union acpi_operand_object *obj_desc)
{
      union acpi_operand_object *extra_desc;
      struct acpi_namespace_node *node;
      acpi_status status;

      ACPI_FUNCTION_TRACE_PTR(ds_get_buffer_field_arguments, obj_desc);

      if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
            return_ACPI_STATUS(AE_OK);
      }

      /* Get the AML pointer (method object) and buffer_field node */

      extra_desc = acpi_ns_get_secondary_object(obj_desc);
      node = obj_desc->buffer_field.node;

      ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
                  (ACPI_TYPE_BUFFER_FIELD, node, NULL));
      ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "[%4.4s] BufferField Arg Init\n",
                    acpi_ut_get_node_name(node)));

      /* Execute the AML code for the term_arg arguments */

      status = acpi_ds_execute_arguments(node, acpi_ns_get_parent_node(node),
                                 extra_desc->extra.aml_length,
                                 extra_desc->extra.aml_start);
      return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_get_buffer_arguments
 *
 * PARAMETERS:  obj_desc        - A valid Buffer object
 *
 * RETURN:      Status.
 *
 * DESCRIPTION: Get Buffer length and initializer byte list.  This implements
 *              the late evaluation of these attributes.
 *
 ******************************************************************************/

acpi_status acpi_ds_get_buffer_arguments(union acpi_operand_object *obj_desc)
{
      struct acpi_namespace_node *node;
      acpi_status status;

      ACPI_FUNCTION_TRACE_PTR(ds_get_buffer_arguments, obj_desc);

      if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
            return_ACPI_STATUS(AE_OK);
      }

      /* Get the Buffer node */

      node = obj_desc->buffer.node;
      if (!node) {
            ACPI_ERROR((AE_INFO,
                      "No pointer back to NS node in buffer obj %p",
                      obj_desc));
            return_ACPI_STATUS(AE_AML_INTERNAL);
      }

      ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Buffer Arg Init\n"));

      /* Execute the AML code for the term_arg arguments */

      status = acpi_ds_execute_arguments(node, node,
                                 obj_desc->buffer.aml_length,
                                 obj_desc->buffer.aml_start);
      return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_get_package_arguments
 *
 * PARAMETERS:  obj_desc        - A valid Package object
 *
 * RETURN:      Status.
 *
 * DESCRIPTION: Get Package length and initializer byte list.  This implements
 *              the late evaluation of these attributes.
 *
 ******************************************************************************/

acpi_status acpi_ds_get_package_arguments(union acpi_operand_object *obj_desc)
{
      struct acpi_namespace_node *node;
      acpi_status status;

      ACPI_FUNCTION_TRACE_PTR(ds_get_package_arguments, obj_desc);

      if (obj_desc->common.flags & AOPOBJ_DATA_VALID) {
            return_ACPI_STATUS(AE_OK);
      }

      /* Get the Package node */

      node = obj_desc->package.node;
      if (!node) {
            ACPI_ERROR((AE_INFO,
                      "No pointer back to NS node in package %p",
                      obj_desc));
            return_ACPI_STATUS(AE_AML_INTERNAL);
      }

      ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Package Arg Init\n"));

      /* Execute the AML code for the term_arg arguments */

      status = acpi_ds_execute_arguments(node, node,
                                 obj_desc->package.aml_length,
                                 obj_desc->package.aml_start);
      return_ACPI_STATUS(status);
}

/*****************************************************************************
 *
 * FUNCTION:    acpi_ds_get_region_arguments
 *
 * PARAMETERS:  obj_desc        - A valid region object
 *
 * RETURN:      Status.
 *
 * DESCRIPTION: Get region address and length.  This implements the late
 *              evaluation of these region attributes.
 *
 ****************************************************************************/

acpi_status acpi_ds_get_region_arguments(union acpi_operand_object *obj_desc)
{
      struct acpi_namespace_node *node;
      acpi_status status;
      union acpi_operand_object *extra_desc;

      ACPI_FUNCTION_TRACE_PTR(ds_get_region_arguments, obj_desc);

      if (obj_desc->region.flags & AOPOBJ_DATA_VALID) {
            return_ACPI_STATUS(AE_OK);
      }

      extra_desc = acpi_ns_get_secondary_object(obj_desc);
      if (!extra_desc) {
            return_ACPI_STATUS(AE_NOT_EXIST);
      }

      /* Get the Region node */

      node = obj_desc->region.node;

      ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
                  (ACPI_TYPE_REGION, node, NULL));

      ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "[%4.4s] OpRegion Arg Init at AML %p\n",
                    acpi_ut_get_node_name(node),
                    extra_desc->extra.aml_start));

      /* Execute the argument AML */

      status = acpi_ds_execute_arguments(node, acpi_ns_get_parent_node(node),
                                 extra_desc->extra.aml_length,
                                 extra_desc->extra.aml_start);
      if (ACPI_FAILURE(status)) {
            return_ACPI_STATUS(status);
      }

      /* Validate the region address/length via the host OS */

      status = acpi_os_validate_address(obj_desc->region.space_id,
                                obj_desc->region.address,
                                (acpi_size) obj_desc->region.length);
      if (ACPI_FAILURE(status)) {
            /*
             * Invalid address/length. We will emit an error message and mark
             * the region as invalid, so that it will cause an additional error if
             * it is ever used. Then return AE_OK.
             */
            ACPI_EXCEPTION((AE_INFO, status,
                        "During address validation of OpRegion [%4.4s]",
                        node->name.ascii));
            obj_desc->common.flags |= AOPOBJ_INVALID;
            status = AE_OK;
      }

      return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_initialize_region
 *
 * PARAMETERS:  obj_handle      - Region namespace node
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Front end to ev_initialize_region
 *
 ******************************************************************************/

acpi_status acpi_ds_initialize_region(acpi_handle obj_handle)
{
      union acpi_operand_object *obj_desc;
      acpi_status status;

      obj_desc = acpi_ns_get_attached_object(obj_handle);

      /* Namespace is NOT locked */

      status = acpi_ev_initialize_region(obj_desc, FALSE);
      return (status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_init_buffer_field
 *
 * PARAMETERS:  aml_opcode      - create_xxx_field
 *              obj_desc        - buffer_field object
 *              buffer_desc     - Host Buffer
 *              offset_desc     - Offset into buffer
 *              length_desc     - Length of field (CREATE_FIELD_OP only)
 *              result_desc     - Where to store the result
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Perform actual initialization of a buffer field
 *
 ******************************************************************************/

static acpi_status
acpi_ds_init_buffer_field(u16 aml_opcode,
                    union acpi_operand_object *obj_desc,
                    union acpi_operand_object *buffer_desc,
                    union acpi_operand_object *offset_desc,
                    union acpi_operand_object *length_desc,
                    union acpi_operand_object *result_desc)
{
      u32 offset;
      u32 bit_offset;
      u32 bit_count;
      u8 field_flags;
      acpi_status status;

      ACPI_FUNCTION_TRACE_PTR(ds_init_buffer_field, obj_desc);

      /* Host object must be a Buffer */

      if (ACPI_GET_OBJECT_TYPE(buffer_desc) != ACPI_TYPE_BUFFER) {
            ACPI_ERROR((AE_INFO,
                      "Target of Create Field is not a Buffer object - %s",
                      acpi_ut_get_object_type_name(buffer_desc)));

            status = AE_AML_OPERAND_TYPE;
            goto cleanup;
      }

      /*
       * The last parameter to all of these opcodes (result_desc) started
       * out as a name_string, and should therefore now be a NS node
       * after resolution in acpi_ex_resolve_operands().
       */
      if (ACPI_GET_DESCRIPTOR_TYPE(result_desc) != ACPI_DESC_TYPE_NAMED) {
            ACPI_ERROR((AE_INFO,
                      "(%s) destination not a NS Node [%s]",
                      acpi_ps_get_opcode_name(aml_opcode),
                      acpi_ut_get_descriptor_name(result_desc)));

            status = AE_AML_OPERAND_TYPE;
            goto cleanup;
      }

      offset = (u32) offset_desc->integer.value;

      /*
       * Setup the Bit offsets and counts, according to the opcode
       */
      switch (aml_opcode) {
      case AML_CREATE_FIELD_OP:

            /* Offset is in bits, count is in bits */

            field_flags = AML_FIELD_ACCESS_BYTE;
            bit_offset = offset;
            bit_count = (u32) length_desc->integer.value;

            /* Must have a valid (>0) bit count */

            if (bit_count == 0) {
                  ACPI_ERROR((AE_INFO,
                            "Attempt to CreateField of length zero"));
                  status = AE_AML_OPERAND_VALUE;
                  goto cleanup;
            }
            break;

      case AML_CREATE_BIT_FIELD_OP:

            /* Offset is in bits, Field is one bit */

            bit_offset = offset;
            bit_count = 1;
            field_flags = AML_FIELD_ACCESS_BYTE;
            break;

      case AML_CREATE_BYTE_FIELD_OP:

            /* Offset is in bytes, field is one byte */

            bit_offset = 8 * offset;
            bit_count = 8;
            field_flags = AML_FIELD_ACCESS_BYTE;
            break;

      case AML_CREATE_WORD_FIELD_OP:

            /* Offset is in bytes, field is one word */

            bit_offset = 8 * offset;
            bit_count = 16;
            field_flags = AML_FIELD_ACCESS_WORD;
            break;

      case AML_CREATE_DWORD_FIELD_OP:

            /* Offset is in bytes, field is one dword */

            bit_offset = 8 * offset;
            bit_count = 32;
            field_flags = AML_FIELD_ACCESS_DWORD;
            break;

      case AML_CREATE_QWORD_FIELD_OP:

            /* Offset is in bytes, field is one qword */

            bit_offset = 8 * offset;
            bit_count = 64;
            field_flags = AML_FIELD_ACCESS_QWORD;
            break;

      default:

            ACPI_ERROR((AE_INFO,
                      "Unknown field creation opcode %02x", aml_opcode));
            status = AE_AML_BAD_OPCODE;
            goto cleanup;
      }

      /* Entire field must fit within the current length of the buffer */

      if ((bit_offset + bit_count) > (8 * (u32) buffer_desc->buffer.length)) {
            ACPI_ERROR((AE_INFO,
                      "Field [%4.4s] at %d exceeds Buffer [%4.4s] size %d (bits)",
                      acpi_ut_get_node_name(result_desc),
                      bit_offset + bit_count,
                      acpi_ut_get_node_name(buffer_desc->buffer.node),
                      8 * (u32) buffer_desc->buffer.length));
            status = AE_AML_BUFFER_LIMIT;
            goto cleanup;
      }

      /*
       * Initialize areas of the field object that are common to all fields
       * For field_flags, use LOCK_RULE = 0 (NO_LOCK),
       * UPDATE_RULE = 0 (UPDATE_PRESERVE)
       */
      status = acpi_ex_prep_common_field_object(obj_desc, field_flags, 0,
                                      bit_offset, bit_count);
      if (ACPI_FAILURE(status)) {
            goto cleanup;
      }

      obj_desc->buffer_field.buffer_obj = buffer_desc;

      /* Reference count for buffer_desc inherits obj_desc count */

      buffer_desc->common.reference_count = (u16)
          (buffer_desc->common.reference_count +
           obj_desc->common.reference_count);

      cleanup:

      /* Always delete the operands */

      acpi_ut_remove_reference(offset_desc);
      acpi_ut_remove_reference(buffer_desc);

      if (aml_opcode == AML_CREATE_FIELD_OP) {
            acpi_ut_remove_reference(length_desc);
      }

      /* On failure, delete the result descriptor */

      if (ACPI_FAILURE(status)) {
            acpi_ut_remove_reference(result_desc);    /* Result descriptor */
      } else {
            /* Now the address and length are valid for this buffer_field */

            obj_desc->buffer_field.flags |= AOPOBJ_DATA_VALID;
      }

      return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_eval_buffer_field_operands
 *
 * PARAMETERS:  walk_state      - Current walk
 *              Op              - A valid buffer_field Op object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get buffer_field Buffer and Index
 *              Called from acpi_ds_exec_end_op during buffer_field parse tree walk
 *
 ******************************************************************************/

acpi_status
acpi_ds_eval_buffer_field_operands(struct acpi_walk_state *walk_state,
                           union acpi_parse_object *op)
{
      acpi_status status;
      union acpi_operand_object *obj_desc;
      struct acpi_namespace_node *node;
      union acpi_parse_object *next_op;

      ACPI_FUNCTION_TRACE_PTR(ds_eval_buffer_field_operands, op);

      /*
       * This is where we evaluate the address and length fields of the
       * create_xxx_field declaration
       */
      node = op->common.node;

      /* next_op points to the op that holds the Buffer */

      next_op = op->common.value.arg;

      /* Evaluate/create the address and length operands */

      status = acpi_ds_create_operands(walk_state, next_op);
      if (ACPI_FAILURE(status)) {
            return_ACPI_STATUS(status);
      }

      obj_desc = acpi_ns_get_attached_object(node);
      if (!obj_desc) {
            return_ACPI_STATUS(AE_NOT_EXIST);
      }

      /* Resolve the operands */

      status = acpi_ex_resolve_operands(op->common.aml_opcode,
                                ACPI_WALK_OPERANDS, walk_state);

      ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE,
                     acpi_ps_get_opcode_name(op->common.aml_opcode),
                     walk_state->num_operands,
                     "after AcpiExResolveOperands");

      if (ACPI_FAILURE(status)) {
            ACPI_ERROR((AE_INFO, "(%s) bad operand(s) (%X)",
                      acpi_ps_get_opcode_name(op->common.aml_opcode),
                      status));

            return_ACPI_STATUS(status);
      }

      /* Initialize the Buffer Field */

      if (op->common.aml_opcode == AML_CREATE_FIELD_OP) {

            /* NOTE: Slightly different operands for this opcode */

            status =
                acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
                                    walk_state->operands[0],
                                    walk_state->operands[1],
                                    walk_state->operands[2],
                                    walk_state->operands[3]);
      } else {
            /* All other, create_xxx_field opcodes */

            status =
                acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
                                    walk_state->operands[0],
                                    walk_state->operands[1], NULL,
                                    walk_state->operands[2]);
      }

      return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_eval_region_operands
 *
 * PARAMETERS:  walk_state      - Current walk
 *              Op              - A valid region Op object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get region address and length
 *              Called from acpi_ds_exec_end_op during op_region parse tree walk
 *
 ******************************************************************************/

acpi_status
acpi_ds_eval_region_operands(struct acpi_walk_state *walk_state,
                       union acpi_parse_object *op)
{
      acpi_status status;
      union acpi_operand_object *obj_desc;
      union acpi_operand_object *operand_desc;
      struct acpi_namespace_node *node;
      union acpi_parse_object *next_op;

      ACPI_FUNCTION_TRACE_PTR(ds_eval_region_operands, op);

      /*
       * This is where we evaluate the address and length fields of the
       * op_region declaration
       */
      node = op->common.node;

      /* next_op points to the op that holds the space_iD */

      next_op = op->common.value.arg;

      /* next_op points to address op */

      next_op = next_op->common.next;

      /* Evaluate/create the address and length operands */

      status = acpi_ds_create_operands(walk_state, next_op);
      if (ACPI_FAILURE(status)) {
            return_ACPI_STATUS(status);
      }

      /* Resolve the length and address operands to numbers */

      status = acpi_ex_resolve_operands(op->common.aml_opcode,
                                ACPI_WALK_OPERANDS, walk_state);
      if (ACPI_FAILURE(status)) {
            return_ACPI_STATUS(status);
      }

      ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS, ACPI_IMODE_EXECUTE,
                     acpi_ps_get_opcode_name(op->common.aml_opcode),
                     1, "after AcpiExResolveOperands");

      obj_desc = acpi_ns_get_attached_object(node);
      if (!obj_desc) {
            return_ACPI_STATUS(AE_NOT_EXIST);
      }

      /*
       * Get the length operand and save it
       * (at Top of stack)
       */
      operand_desc = walk_state->operands[walk_state->num_operands - 1];

      obj_desc->region.length = (u32) operand_desc->integer.value;
      acpi_ut_remove_reference(operand_desc);

      /*
       * Get the address and save it
       * (at top of stack - 1)
       */
      operand_desc = walk_state->operands[walk_state->num_operands - 2];

      obj_desc->region.address = (acpi_physical_address)
          operand_desc->integer.value;
      acpi_ut_remove_reference(operand_desc);

      ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "RgnObj %p Addr %8.8X%8.8X Len %X\n",
                    obj_desc,
                    ACPI_FORMAT_UINT64(obj_desc->region.address),
                    obj_desc->region.length));

      /* Now the address and length are valid for this opregion */

      obj_desc->region.flags |= AOPOBJ_DATA_VALID;

      return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_eval_data_object_operands
 *
 * PARAMETERS:  walk_state      - Current walk
 *              Op              - A valid data_object Op object
 *              obj_desc        - data_object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get the operands and complete the following data object types:
 *              Buffer, Package.
 *
 ******************************************************************************/

acpi_status
acpi_ds_eval_data_object_operands(struct acpi_walk_state *walk_state,
                          union acpi_parse_object *op,
                          union acpi_operand_object *obj_desc)
{
      acpi_status status;
      union acpi_operand_object *arg_desc;
      u32 length;

      ACPI_FUNCTION_TRACE(ds_eval_data_object_operands);

      /* The first operand (for all of these data objects) is the length */

      status = acpi_ds_create_operand(walk_state, op->common.value.arg, 1);
      if (ACPI_FAILURE(status)) {
            return_ACPI_STATUS(status);
      }

      status = acpi_ex_resolve_operands(walk_state->opcode,
                                &(walk_state->
                                  operands[walk_state->num_operands -
                                         1]), walk_state);
      if (ACPI_FAILURE(status)) {
            return_ACPI_STATUS(status);
      }

      /* Extract length operand */

      arg_desc = walk_state->operands[walk_state->num_operands - 1];
      length = (u32) arg_desc->integer.value;

      /* Cleanup for length operand */

      status = acpi_ds_obj_stack_pop(1, walk_state);
      if (ACPI_FAILURE(status)) {
            return_ACPI_STATUS(status);
      }

      acpi_ut_remove_reference(arg_desc);

      /*
       * Create the actual data object
       */
      switch (op->common.aml_opcode) {
      case AML_BUFFER_OP:

            status =
                acpi_ds_build_internal_buffer_obj(walk_state, op, length,
                                          &obj_desc);
            break;

      case AML_PACKAGE_OP:
      case AML_VAR_PACKAGE_OP:

            status =
                acpi_ds_build_internal_package_obj(walk_state, op, length,
                                           &obj_desc);
            break;

      default:
            return_ACPI_STATUS(AE_AML_BAD_OPCODE);
      }

      if (ACPI_SUCCESS(status)) {
            /*
             * Return the object in the walk_state, unless the parent is a package -
             * in this case, the return object will be stored in the parse tree
             * for the package.
             */
            if ((!op->common.parent) ||
                ((op->common.parent->common.aml_opcode != AML_PACKAGE_OP) &&
                 (op->common.parent->common.aml_opcode !=
                  AML_VAR_PACKAGE_OP)
                 && (op->common.parent->common.aml_opcode != AML_NAME_OP))) {
                  walk_state->result_obj = obj_desc;
            }
      }

      return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_exec_begin_control_op
 *
 * PARAMETERS:  walk_list       - The list that owns the walk stack
 *              Op              - The control Op
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Handles all control ops encountered during control method
 *              execution.
 *
 ******************************************************************************/

acpi_status
acpi_ds_exec_begin_control_op(struct acpi_walk_state *walk_state,
                        union acpi_parse_object *op)
{
      acpi_status status = AE_OK;
      union acpi_generic_state *control_state;

      ACPI_FUNCTION_NAME(ds_exec_begin_control_op);

      ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p Opcode=%2.2X State=%p\n", op,
                    op->common.aml_opcode, walk_state));

      switch (op->common.aml_opcode) {
      case AML_IF_OP:
      case AML_WHILE_OP:

            /*
             * IF/WHILE: Create a new control state to manage these
             * constructs. We need to manage these as a stack, in order
             * to handle nesting.
             */
            control_state = acpi_ut_create_control_state();
            if (!control_state) {
                  status = AE_NO_MEMORY;
                  break;
            }
            /*
             * Save a pointer to the predicate for multiple executions
             * of a loop
             */
            control_state->control.aml_predicate_start =
                walk_state->parser_state.aml - 1;
            control_state->control.package_end =
                walk_state->parser_state.pkg_end;
            control_state->control.opcode = op->common.aml_opcode;

            /* Push the control state on this walk's control stack */

            acpi_ut_push_generic_state(&walk_state->control_state,
                                 control_state);
            break;

      case AML_ELSE_OP:

            /* Predicate is in the state object */
            /* If predicate is true, the IF was executed, ignore ELSE part */

            if (walk_state->last_predicate) {
                  status = AE_CTRL_TRUE;
            }

            break;

      case AML_RETURN_OP:

            break;

      default:
            break;
      }

      return (status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_exec_end_control_op
 *
 * PARAMETERS:  walk_list       - The list that owns the walk stack
 *              Op              - The control Op
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Handles all control ops encountered during control method
 *              execution.
 *
 ******************************************************************************/

acpi_status
acpi_ds_exec_end_control_op(struct acpi_walk_state * walk_state,
                      union acpi_parse_object * op)
{
      acpi_status status = AE_OK;
      union acpi_generic_state *control_state;

      ACPI_FUNCTION_NAME(ds_exec_end_control_op);

      switch (op->common.aml_opcode) {
      case AML_IF_OP:

            ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[IF_OP] Op=%p\n", op));

            /*
             * Save the result of the predicate in case there is an
             * ELSE to come
             */
            walk_state->last_predicate =
                (u8) walk_state->control_state->common.value;

            /*
             * Pop the control state that was created at the start
             * of the IF and free it
             */
            control_state =
                acpi_ut_pop_generic_state(&walk_state->control_state);
            acpi_ut_delete_generic_state(control_state);
            break;

      case AML_ELSE_OP:

            break;

      case AML_WHILE_OP:

            ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[WHILE_OP] Op=%p\n", op));

            if (walk_state->control_state->common.value) {

                  /* Predicate was true, go back and evaluate it again! */

                  status = AE_CTRL_PENDING;
            }

            ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
                          "[WHILE_OP] termination! Op=%p\n", op));

            /* Pop this control state and free it */

            control_state =
                acpi_ut_pop_generic_state(&walk_state->control_state);

            walk_state->aml_last_while =
                control_state->control.aml_predicate_start;
            acpi_ut_delete_generic_state(control_state);
            break;

      case AML_RETURN_OP:

            ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
                          "[RETURN_OP] Op=%p Arg=%p\n", op,
                          op->common.value.arg));

            /*
             * One optional operand -- the return value
             * It can be either an immediate operand or a result that
             * has been bubbled up the tree
             */
            if (op->common.value.arg) {

                  /* Since we have a real Return(), delete any implicit return */

                  acpi_ds_clear_implicit_return(walk_state);

                  /* Return statement has an immediate operand */

                  status =
                      acpi_ds_create_operands(walk_state,
                                        op->common.value.arg);
                  if (ACPI_FAILURE(status)) {
                        return (status);
                  }

                  /*
                   * If value being returned is a Reference (such as
                   * an arg or local), resolve it now because it may
                   * cease to exist at the end of the method.
                   */
                  status =
                      acpi_ex_resolve_to_value(&walk_state->operands[0],
                                         walk_state);
                  if (ACPI_FAILURE(status)) {
                        return (status);
                  }

                  /*
                   * Get the return value and save as the last result
                   * value.  This is the only place where walk_state->return_desc
                   * is set to anything other than zero!
                   */
                  walk_state->return_desc = walk_state->operands[0];
            } else if ((walk_state->results) &&
                     (walk_state->results->results.num_results > 0)) {

                  /* Since we have a real Return(), delete any implicit return */

                  acpi_ds_clear_implicit_return(walk_state);

                  /*
                   * The return value has come from a previous calculation.
                   *
                   * If value being returned is a Reference (such as
                   * an arg or local), resolve it now because it may
                   * cease to exist at the end of the method.
                   *
                   * Allow references created by the Index operator to return unchanged.
                   */
                  if ((ACPI_GET_DESCRIPTOR_TYPE
                       (walk_state->results->results.obj_desc[0]) ==
                       ACPI_DESC_TYPE_OPERAND)
                      &&
                      (ACPI_GET_OBJECT_TYPE
                       (walk_state->results->results.obj_desc[0]) ==
                       ACPI_TYPE_LOCAL_REFERENCE)
                      && ((walk_state->results->results.obj_desc[0])->
                        reference.opcode != AML_INDEX_OP)) {
                        status =
                            acpi_ex_resolve_to_value(&walk_state->
                                               results->results.
                                               obj_desc[0],
                                               walk_state);
                        if (ACPI_FAILURE(status)) {
                              return (status);
                        }
                  }

                  walk_state->return_desc =
                      walk_state->results->results.obj_desc[0];
            } else {
                  /* No return operand */

                  if (walk_state->num_operands) {
                        acpi_ut_remove_reference(walk_state->
                                           operands[0]);
                  }

                  walk_state->operands[0] = NULL;
                  walk_state->num_operands = 0;
                  walk_state->return_desc = NULL;
            }

            ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
                          "Completed RETURN_OP State=%p, RetVal=%p\n",
                          walk_state, walk_state->return_desc));

            /* End the control method execution right now */

            status = AE_CTRL_TERMINATE;
            break;

      case AML_NOOP_OP:

            /* Just do nothing! */
            break;

      case AML_BREAK_POINT_OP:

            /* Call up to the OS service layer to handle this */

            status =
                acpi_os_signal(ACPI_SIGNAL_BREAKPOINT,
                           "Executed AML Breakpoint opcode");

            /* If and when it returns, all done. */

            break;

      case AML_BREAK_OP:
      case AML_CONTINUE_OP:   /* ACPI 2.0 */

            /* Pop and delete control states until we find a while */

            while (walk_state->control_state &&
                   (walk_state->control_state->control.opcode !=
                  AML_WHILE_OP)) {
                  control_state =
                      acpi_ut_pop_generic_state(&walk_state->
                                          control_state);
                  acpi_ut_delete_generic_state(control_state);
            }

            /* No while found? */

            if (!walk_state->control_state) {
                  return (AE_AML_NO_WHILE);
            }

            /* Was: walk_state->aml_last_while = walk_state->control_state->Control.aml_predicate_start; */

            walk_state->aml_last_while =
                walk_state->control_state->control.package_end;

            /* Return status depending on opcode */

            if (op->common.aml_opcode == AML_BREAK_OP) {
                  status = AE_CTRL_BREAK;
            } else {
                  status = AE_CTRL_CONTINUE;
            }
            break;

      default:

            ACPI_ERROR((AE_INFO, "Unknown control opcode=%X Op=%p",
                      op->common.aml_opcode, op));

            status = AE_AML_BAD_OPCODE;
            break;
      }

      return (status);
}

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