utmisc.c

内核linux2.4.20,可跟rtlinux3.2打补丁 组成实时linux系统,编译内核

/*******************************************************************************
 *
 * FUNCTION:    Acpi_ut_pop_generic_state
 *
 * PARAMETERS:  List_head           - Head of the state stack
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Pop a state object from a state stack
 *
 ******************************************************************************/

acpi_generic_state *
acpi_ut_pop_generic_state (
	acpi_generic_state      **list_head)
{
	acpi_generic_state      *state;


	FUNCTION_TRACE ("Ut_pop_generic_state");


	/* Remove the state object at the head of the list (stack) */

	state = *list_head;
	if (state) {
		/* Update the list head */

		*list_head = state->common.next;
	}

	return_PTR (state);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ut_create_generic_state
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create a generic state object.  Attempt to obtain one from
 *              the global state cache;  If none available, create a new one.
 *
 ******************************************************************************/

acpi_generic_state *
acpi_ut_create_generic_state (void)
{
	acpi_generic_state      *state;


	FUNCTION_ENTRY ();


	state = acpi_ut_acquire_from_cache (ACPI_MEM_LIST_STATE);

	/* Initialize */

	if (state) {
		state->common.data_type = ACPI_DESC_TYPE_STATE;
	}

	return (state);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ut_create_update_state
 *
 * PARAMETERS:  Object              - Initial Object to be installed in the
 *                                    state
 *              Action              - Update action to be performed
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create an "Update State" - a flavor of the generic state used
 *              to update reference counts and delete complex objects such
 *              as packages.
 *
 ******************************************************************************/

acpi_generic_state *
acpi_ut_create_update_state (
	acpi_operand_object     *object,
	u16                     action)
{
	acpi_generic_state      *state;


	FUNCTION_TRACE_PTR ("Ut_create_update_state", object);


	/* Create the generic state object */

	state = acpi_ut_create_generic_state ();
	if (!state) {
		return (NULL);
	}

	/* Init fields specific to the update struct */

	state->common.data_type = ACPI_DESC_TYPE_STATE_UPDATE;
	state->update.object = object;
	state->update.value  = action;

	return_PTR (state);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ut_create_pkg_state
 *
 * PARAMETERS:  Object              - Initial Object to be installed in the
 *                                    state
 *              Action              - Update action to be performed
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create a "Package State"
 *
 ******************************************************************************/

acpi_generic_state *
acpi_ut_create_pkg_state (
	void                    *internal_object,
	void                    *external_object,
	u16                     index)
{
	acpi_generic_state      *state;


	FUNCTION_TRACE_PTR ("Ut_create_pkg_state", internal_object);


	/* Create the generic state object */

	state = acpi_ut_create_generic_state ();
	if (!state) {
		return (NULL);
	}

	/* Init fields specific to the update struct */

	state->common.data_type = ACPI_DESC_TYPE_STATE_PACKAGE;
	state->pkg.source_object = (acpi_operand_object *) internal_object;
	state->pkg.dest_object  = external_object;
	state->pkg.index        = index;
	state->pkg.num_packages = 1;

	return_PTR (state);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ut_create_control_state
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create a "Control State" - a flavor of the generic state used
 *              to support nested IF/WHILE constructs in the AML.
 *
 ******************************************************************************/

acpi_generic_state *
acpi_ut_create_control_state (
	void)
{
	acpi_generic_state      *state;


	FUNCTION_TRACE ("Ut_create_control_state");


	/* Create the generic state object */

	state = acpi_ut_create_generic_state ();
	if (!state) {
		return (NULL);
	}


	/* Init fields specific to the control struct */

	state->common.data_type = ACPI_DESC_TYPE_STATE_CONTROL;
	state->common.state     = CONTROL_CONDITIONAL_EXECUTING;

	return_PTR (state);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ut_delete_generic_state
 *
 * PARAMETERS:  State               - The state object to be deleted
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Put a state object back into the global state cache.  The object
 *              is not actually freed at this time.
 *
 ******************************************************************************/

void
acpi_ut_delete_generic_state (
	acpi_generic_state      *state)
{
	FUNCTION_TRACE ("Ut_delete_generic_state");


	acpi_ut_release_to_cache (ACPI_MEM_LIST_STATE, state);
	return_VOID;
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ut_delete_generic_state_cache
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Purge the global state object cache.  Used during subsystem
 *              termination.
 *
 ******************************************************************************/

void
acpi_ut_delete_generic_state_cache (
	void)
{
	FUNCTION_TRACE ("Ut_delete_generic_state_cache");


	acpi_ut_delete_generic_cache (ACPI_MEM_LIST_STATE);
	return_VOID;
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ut_resolve_package_references
 *
 * PARAMETERS:  Obj_desc        - The Package object on which to resolve refs
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Walk through a package and turn internal references into values
 *
 ******************************************************************************/

acpi_status
acpi_ut_resolve_package_references (
	acpi_operand_object     *obj_desc)
{
	u32                     count;
	acpi_operand_object     *sub_object;


	FUNCTION_TRACE ("Ut_resolve_package_references");


	if (obj_desc->common.type != ACPI_TYPE_PACKAGE) {
		/* The object must be a package */

		REPORT_ERROR (("Must resolve Package Refs on a Package\n"));
		return_ACPI_STATUS(AE_ERROR);
	}

	/*
	 * TBD: what about nested packages? */

	for (count = 0; count < obj_desc->package.count; count++) {
		sub_object = obj_desc->package.elements[count];

		if (sub_object->common.type == INTERNAL_TYPE_REFERENCE) {
			if (sub_object->reference.opcode == AML_ZERO_OP) {
				sub_object->common.type = ACPI_TYPE_INTEGER;
				sub_object->integer.value = 0;
			}

			else if (sub_object->reference.opcode == AML_ONE_OP) {
				sub_object->common.type = ACPI_TYPE_INTEGER;
				sub_object->integer.value = 1;
			}

			else if (sub_object->reference.opcode == AML_ONES_OP) {
				sub_object->common.type = ACPI_TYPE_INTEGER;
				sub_object->integer.value = ACPI_INTEGER_MAX;
			}
		}
	}

	return_ACPI_STATUS(AE_OK);
}

#ifdef ACPI_DEBUG

/*******************************************************************************
 *
 * FUNCTION:    Acpi_ut_display_init_pathname
 *
 * PARAMETERS:  Obj_handle          - Handle whose pathname will be displayed
 *              Path                - Additional path string to be appended
 *
 * RETURN:      acpi_status
 *
 * DESCRIPTION: Display full pathnbame of an object, DEBUG ONLY
 *
 ******************************************************************************/

void
acpi_ut_display_init_pathname (
	acpi_handle             obj_handle,
	char                    *path)
{
	acpi_status             status;
	u32                     length = 128;
	char                    buffer[128];


	PROC_NAME ("Ut_display_init_pathname");


	status = acpi_ns_handle_to_pathname (obj_handle, &length, buffer);
	if (ACPI_SUCCESS (status)) {
		if (path) {
			ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "%s.%s\n", buffer, path));
		}
		else {
			ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "%s\n", buffer));
		}
	}
}
#endif

/*******************************************************************************
 *
 * FUNCTION:    Acpi_ut_walk_package_tree
 *
 * PARAMETERS:  Obj_desc        - The Package object on which to resolve refs
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Walk through a package
 *
 ******************************************************************************/

acpi_status
acpi_ut_walk_package_tree (
	acpi_operand_object     *source_object,
	void                    *target_object,
	ACPI_PKG_CALLBACK       walk_callback,
	void                    *context)
{
	acpi_status             status = AE_OK;
	acpi_generic_state      *state_list = NULL;
	acpi_generic_state      *state;
	u32                     this_index;
	acpi_operand_object     *this_source_obj;


	FUNCTION_TRACE ("Ut_walk_package_tree");


	state = acpi_ut_create_pkg_state (source_object, target_object, 0);
	if (!state) {
		return_ACPI_STATUS (AE_NO_MEMORY);
	}

	while (state) {
		this_index    = state->pkg.index;
		this_source_obj = (acpi_operand_object *)
				  state->pkg.source_object->package.elements[this_index];

		/*
		 * Check for
		 * 1) An uninitialized package element.  It is completely
		 *      legal to declare a package and leave it uninitialized
		 * 2) Not an internal object - can be a namespace node instead
		 * 3) Any type other than a package.  Packages are handled in else
		 *      case below.
		 */
		if ((!this_source_obj) ||
			(!VALID_DESCRIPTOR_TYPE (
					this_source_obj, ACPI_DESC_TYPE_INTERNAL)) ||
			(!IS_THIS_OBJECT_TYPE (
					this_source_obj, ACPI_TYPE_PACKAGE))) {

			status = walk_callback (ACPI_COPY_TYPE_SIMPLE, this_source_obj,
					 state, context);
			if (ACPI_FAILURE (status)) {
				/* TBD: must delete package created up to this point */

				return_ACPI_STATUS (status);
			}

			state->pkg.index++;
			while (state->pkg.index >= state->pkg.source_object->package.count) {
				/*
				 * We've handled all of the objects at this level,  This means
				 * that we have just completed a package.  That package may
				 * have contained one or more packages itself.
				 *
				 * Delete this state and pop the previous state (package).
				 */
				acpi_ut_delete_generic_state (state);
				state = acpi_ut_pop_generic_state (&state_list);


				/* Finished when there are no more states */

				if (!state) {
					/*
					 * We have handled all of the objects in the top level
					 * package just add the length of the package objects
					 * and exit
					 */
					return_ACPI_STATUS (AE_OK);
				}

				/*
				 * Go back up a level and move the index past the just
				 * completed package object.
				 */
				state->pkg.index++;
			}
		}

		else {
			/* This is a sub-object of type package */

			status = walk_callback (ACPI_COPY_TYPE_PACKAGE, this_source_obj,
					  state, context);
			if (ACPI_FAILURE (status)) {
				/* TBD: must delete package created up to this point */

				return_ACPI_STATUS (status);
			}


			/*
			 * The callback above returned a new target package object.
			 */

			/*
			 * Push the current state and create a new one
			 */
			acpi_ut_push_generic_state (&state_list, state);
			state = acpi_ut_create_pkg_state (this_source_obj,
					   state->pkg.this_target_obj, 0);
			if (!state) {
				/* TBD: must delete package created up to this point */

				return_ACPI_STATUS (AE_NO_MEMORY);
			}
		}
	}

	/* We should never get here */

	return (AE_AML_INTERNAL);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ut_report_error
 *
 * PARAMETERS:  Module_name         - Caller's module name (for error output)
 *              Line_number         - Caller's line number (for error output)
 *              Component_id        - Caller's component ID (for error output)
 *              Message             - Error message to use on failure
 *
 * RETURN:      None
 *
 * DESCRIPTION: Print error message
 *
 ******************************************************************************/

void
acpi_ut_report_error (
	NATIVE_CHAR             *module_name,
	u32                     line_number,
	u32                     component_id)
{


	acpi_os_printf ("%8s-%04d: *** Error: ", module_name, line_number);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ut_report_warning
 *
 * PARAMETERS:  Module_name         - Caller's module name (for error output)
 *              Line_number         - Caller's line number (for error output)
 *              Component_id        - Caller's component ID (for error output)
 *              Message             - Error message to use on failure
 *
 * RETURN:      None
 *
 * DESCRIPTION: Print warning message
 *
 ******************************************************************************/

void
acpi_ut_report_warning (
	NATIVE_CHAR             *module_name,
	u32                     line_number,
	u32                     component_id)
{

	acpi_os_printf ("%8s-%04d: *** Warning: ", module_name, line_number);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ut_report_info
 *
 * PARAMETERS:  Module_name         - Caller's module name (for error output)
 *              Line_number         - Caller's line number (for error output)
 *              Component_id        - Caller's component ID (for error output)
 *              Message             - Error message to use on failure
 *
 * RETURN:      None
 *
 * DESCRIPTION: Print information message
 *
 ******************************************************************************/

void
acpi_ut_report_info (
	NATIVE_CHAR             *module_name,
	u32                     line_number,
	u32                     component_id)
{

	acpi_os_printf ("%8s-%04d: *** Info: ", module_name, line_number);
}