Quelle  dsargs.c   Sprache: C

// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
 *
 * Module Name: dsargs - Support for execution of dynamic arguments for static
 *                       objects (regions, fields, buffer fields, etc.)
 *
 * Copyright (C) 2000 - 2025, Intel Corp.
 *
 *****************************************************************************/

#include <acpi/acpi.h>
#include "accommon.h"
#include "acparser.h"
#include "amlcode.h"
#include "acdispat.h"
#include "acnamesp.h"

#define _COMPONENT          ACPI_DISPATCHER
ACPI_MODULE_NAME("dsargs")

/* 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);

/*******************************************************************************
 *
 * 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_PTR(ds_execute_arguments, aml_start);

 /* Allocate a new parser op to be the root of the parsed tree */

 op = acpi_ps_alloc_op(AML_INT_EVAL_SUBTREE_OP, aml_start);
 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, aml_start);
 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, node->parent,
        extra_desc->extra.aml_length,
        extra_desc->extra.aml_start);
 return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_get_bank_field_arguments
 *
 * PARAMETERS:  obj_desc        - A valid bank_field object
 *
 * RETURN:      Status.
 *
 * DESCRIPTION: Get bank_field bank_value. This implements the late
 *              evaluation of these field attributes.
 *
 ******************************************************************************/

acpi_status
acpi_ds_get_bank_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_bank_field_arguments, obj_desc);

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

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

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

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

 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "[%4.4s] BankField Arg Init\n",
     acpi_ut_get_node_name(node)));

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

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

 status = acpi_ut_add_address_range(obj_desc->region.space_id,
        obj_desc->region.address,
        obj_desc->region.length, node);
 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 namespace node in buffer object %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 namespace node in package %p",
       obj_desc));
  return_ACPI_STATUS(AE_AML_INTERNAL);
 }

 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Package Argument Init, AML Ptr: %p\n",
     obj_desc->package.aml_start));

 /* 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, extra_desc->extra.scope_node,
        extra_desc->extra.aml_length,
        extra_desc->extra.aml_start);
 if (ACPI_FAILURE(status)) {
  return_ACPI_STATUS(status);
 }

 status = acpi_ut_add_address_range(obj_desc->region.space_id,
        obj_desc->region.address,
        obj_desc->region.length, node);
 return_ACPI_STATUS(status);
}