amcreate.c

Linux内核源代码 为压缩文件 是<<Linux内核>>一书中的源代码

/******************************************************************************
 *
 * Module Name: amcreate - Named object creation
 *              $Revision: 51 $
 *
 *****************************************************************************/

/*
 *  Copyright (C) 2000 R. Byron Moore
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */


#include "acpi.h"
#include "acparser.h"
#include "acinterp.h"
#include "amlcode.h"
#include "acnamesp.h"
#include "acevents.h"
#include "acdispat.h"


#define _COMPONENT          INTERPRETER
	 MODULE_NAME         ("amcreate")


/*******************************************************************************
 *
 * FUNCTION:    Acpi_aml_exec_create_field
 *
 * PARAMETERS:  Opcode              - The opcode to be executed
 *              Operands            - List of operands for the opcode
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute Create_field operators: Create_bit_field_op,
 *              Create_byte_field_op, Create_word_field_op, Create_dWord_field_op,
 *              Create_field_op (which define fields in buffers)
 *
 * ALLOCATION:  Deletes Create_field_op's count operand descriptor
 *
 *
 *  ACPI SPECIFICATION REFERENCES:
 *  Def_create_bit_field := Create_bit_field_op Src_buf Bit_idx   Name_string
 *  Def_create_byte_field := Create_byte_field_op Src_buf Byte_idx Name_string
 *  Def_create_dWord_field := Create_dWord_field_op Src_buf Byte_idx Name_string
 *  Def_create_field    :=  Create_field_op     Src_buf Bit_idx   Num_bits    Name_string
 *  Def_create_word_field := Create_word_field_op Src_buf Byte_idx Name_string
 *  Bit_index           :=  Term_arg=>Integer
 *  Byte_index          :=  Term_arg=>Integer
 *  Num_bits            :=  Term_arg=>Integer
 *  Source_buff         :=  Term_arg=>Buffer
 *
 ******************************************************************************/


ACPI_STATUS
acpi_aml_exec_create_field (
	u8                      *aml_ptr,
	u32                     aml_length,
	ACPI_NAMESPACE_NODE     *node,
	ACPI_WALK_STATE         *walk_state)
{
	ACPI_STATUS             status;
	ACPI_OPERAND_OBJECT     *obj_desc;
	ACPI_OPERAND_OBJECT     *tmp_desc;


	/* Create the region descriptor */

	obj_desc = acpi_cm_create_internal_object (ACPI_TYPE_FIELD_UNIT);
	if (!obj_desc) {
		status = AE_NO_MEMORY;
		goto cleanup;
	}

	/* Construct the field object */

	obj_desc->field_unit.access     = (u8) ACCESS_ANY_ACC;
	obj_desc->field_unit.lock_rule  = (u8) GLOCK_NEVER_LOCK;
	obj_desc->field_unit.update_rule = (u8) UPDATE_PRESERVE;

	/*
	 * Allocate a method object for this field unit
	 */

	obj_desc->field_unit.extra = acpi_cm_create_internal_object (
			 INTERNAL_TYPE_EXTRA);
	if (!obj_desc->field_unit.extra) {
		status = AE_NO_MEMORY;
		goto cleanup;
	}

	/*
	 * Remember location in AML stream of the field unit
	 * opcode and operands -- since the buffer and index
	 * operands must be evaluated.
	 */

	obj_desc->field_unit.extra->extra.pcode     = aml_ptr;
	obj_desc->field_unit.extra->extra.pcode_length = aml_length;
	obj_desc->field_unit.node = node;


	/*
	 * This operation is supposed to cause the destination Name to refer
	 * to the defined Field_unit -- it must not store the constructed
	 * Field_unit object (or its current value) in some location that the
	 * Name may already be pointing to.  So, if the Name currently contains
	 * a reference which would cause Acpi_aml_exec_store() to perform an indirect
	 * store rather than setting the value of the Name itself, clobber that
	 * reference before calling Acpi_aml_exec_store().
	 */

	/* Type of Name's existing value */

	switch (acpi_ns_get_type (node))
	{

	case ACPI_TYPE_FIELD_UNIT:

	case INTERNAL_TYPE_ALIAS:
	case INTERNAL_TYPE_BANK_FIELD:
	case INTERNAL_TYPE_DEF_FIELD:
	case INTERNAL_TYPE_INDEX_FIELD:

		tmp_desc = acpi_ns_get_attached_object (node);
		if (tmp_desc) {
			/*
			 * There is an existing object here;  delete it and zero out the
			 * object field within the Node
			 */

			acpi_cm_remove_reference (tmp_desc);
			acpi_ns_attach_object ((ACPI_NAMESPACE_NODE *) node, NULL,
					 ACPI_TYPE_ANY);
		}

		/* Set the type to ANY (or the store below will fail) */

		((ACPI_NAMESPACE_NODE *) node)->type = ACPI_TYPE_ANY;

		break;


	default:

		break;
	}


	/* Store constructed field descriptor in result location */

	status = acpi_aml_exec_store (obj_desc, (ACPI_OPERAND_OBJECT *) node, walk_state);

	/*
	 * If the field descriptor was not physically stored (or if a failure
	 * above), we must delete it
	 */
	if (obj_desc->common.reference_count <= 1) {
		acpi_cm_remove_reference (obj_desc);
	}


	return (AE_OK);


cleanup:

	/* Delete region object and method subobject */

	if (obj_desc) {
		/* Remove deletes both objects! */

		acpi_cm_remove_reference (obj_desc);
		obj_desc = NULL;
	}

	return (status);
}


/*****************************************************************************
 *
 * FUNCTION:    Acpi_aml_exec_create_alias
 *
 * PARAMETERS:  Operands            - List of operands for the opcode
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create a new named alias
 *
 ****************************************************************************/

ACPI_STATUS
acpi_aml_exec_create_alias (
	ACPI_WALK_STATE         *walk_state)
{
	ACPI_NAMESPACE_NODE     *source_node;
	ACPI_NAMESPACE_NODE     *alias_node;
	ACPI_STATUS             status;


	/* Get the source/alias operands (both NTEs) */

	status = acpi_ds_obj_stack_pop_object ((ACPI_OPERAND_OBJECT **) &source_node,
			 walk_state);
	if (ACPI_FAILURE (status)) {
		return (status);
	}

	/*
	 * Don't pop it, it gets removed in the calling routine
	 */

	alias_node = acpi_ds_obj_stack_get_value (0, walk_state);

	/* Add an additional reference to the object */

	acpi_cm_add_reference (source_node->object);

	/*
	 * Attach the original source Node to the new Alias Node.
	 */
	status = acpi_ns_attach_object (alias_node, source_node->object,
			   source_node->type);


	/*
	 * The new alias assumes the type of the source, but it points
	 * to the same object.  The reference count of the object has two
	 * additional references to prevent deletion out from under either the
	 * source or the alias Node
	 */

	/* Since both operands are NTEs, we don't need to delete them */

	return (status);
}


/*****************************************************************************
 *
 * FUNCTION:    Acpi_aml_exec_create_event
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create a new event object
 *
 ****************************************************************************/

ACPI_STATUS
acpi_aml_exec_create_event (
	ACPI_WALK_STATE         *walk_state)
{
	ACPI_STATUS             status;
	ACPI_OPERAND_OBJECT     *obj_desc;


 BREAKPOINT3;

	obj_desc = acpi_cm_create_internal_object (ACPI_TYPE_EVENT);
	if (!obj_desc) {
		status = AE_NO_MEMORY;
		goto cleanup;
	}

	/* Create the actual OS semaphore */

	/* TBD: [Investigate] should be created with 0 or 1 units? */

	status = acpi_os_create_semaphore (ACPI_NO_UNIT_LIMIT, 1,
			   &obj_desc->event.semaphore);
	if (ACPI_FAILURE (status)) {
		acpi_cm_remove_reference (obj_desc);
		goto cleanup;
	}

	/* Attach object to the Node */

	status = acpi_ns_attach_object (acpi_ds_obj_stack_get_value (0, walk_state),
			   obj_desc, (u8) ACPI_TYPE_EVENT);
	if (ACPI_FAILURE (status)) {
		acpi_os_delete_semaphore (obj_desc->event.semaphore);
		acpi_cm_remove_reference (obj_desc);
		goto cleanup;
	}


cleanup:

	return (status);
}


/*****************************************************************************
 *
 * FUNCTION:    Acpi_aml_exec_create_mutex
 *
 * PARAMETERS:  Interpreter_mode    - Current running mode (load1/Load2/Exec)
 *              Operands            - List of operands for the opcode
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create a new mutex object
 *
 ****************************************************************************/

ACPI_STATUS
acpi_aml_exec_create_mutex (
	ACPI_WALK_STATE         *walk_state)
{
	ACPI_STATUS             status = AE_OK;
	ACPI_OPERAND_OBJECT     *sync_desc;
	ACPI_OPERAND_OBJECT     *obj_desc;


	/* Get the operand */

	status = acpi_ds_obj_stack_pop_object (&sync_desc, walk_state);
	if (ACPI_FAILURE (status)) {
		return (status);
	}

	/* Attempt to allocate a new object */

	obj_desc = acpi_cm_create_internal_object (ACPI_TYPE_MUTEX);
	if (!obj_desc) {
		status = AE_NO_MEMORY;
		goto cleanup;
	}

	/* Create the actual OS semaphore */

	status = acpi_os_create_semaphore (1, 1, &obj_desc->mutex.semaphore);
	if (ACPI_FAILURE (status)) {
		acpi_cm_remove_reference (obj_desc);
		goto cleanup;
	}

	obj_desc->mutex.sync_level = (u8) sync_desc->number.value;

	/* Obj_desc was on the stack top, and the name is below it */

	status = acpi_ns_attach_object (acpi_ds_obj_stack_get_value (0, walk_state),
			  obj_desc, (u8) ACPI_TYPE_MUTEX);
	if (ACPI_FAILURE (status)) {