cmutils.c

Linux内核源代码 为压缩文件 是<<Linux内核>>一书中的源代码

 *
 * DESCRIPTION: Pop a state object from a state stack
 *
 ******************************************************************************/

ACPI_GENERIC_STATE *
acpi_cm_pop_generic_state (
	ACPI_GENERIC_STATE      **list_head)
{
	ACPI_GENERIC_STATE      *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 (state);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_cm_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_cm_create_generic_state (void)
{
	ACPI_GENERIC_STATE      *state;


	acpi_cm_acquire_mutex (ACPI_MTX_CACHES);

	acpi_gbl_state_cache_requests++;

	/* Check the cache first */

	if (acpi_gbl_generic_state_cache) {
		/* There is an object available, use it */

		state = acpi_gbl_generic_state_cache;
		acpi_gbl_generic_state_cache = state->common.next;
		state->common.next = NULL;

		acpi_gbl_state_cache_hits++;
		acpi_gbl_generic_state_cache_depth--;

		acpi_cm_release_mutex (ACPI_MTX_CACHES);

	}

	else {
		/* The cache is empty, create a new object */

		acpi_cm_release_mutex (ACPI_MTX_CACHES);

		state = acpi_cm_callocate (sizeof (ACPI_GENERIC_STATE));
	}

	/* Initialize */

	if (state) {
		/* Always zero out the object before init */

		MEMSET (state, 0, sizeof (ACPI_GENERIC_STATE));

		state->common.data_type = ACPI_DESC_TYPE_STATE;
	}

	return (state);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_cm_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_cm_create_update_state (
	ACPI_OPERAND_OBJECT     *object,
	u16                     action)
{
	ACPI_GENERIC_STATE      *state;


	/* Create the generic state object */

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

	/* Init fields specific to the update struct */

	state->update.object = object;
	state->update.value  = action;

	return (state);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_cm_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_cm_create_control_state (
	void)
{
	ACPI_GENERIC_STATE      *state;


	/* Create the generic state object */

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


	/* Init fields specific to the control struct */

	state->common.state = CONTROL_CONDITIONAL_EXECUTING;

	return (state);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_cm_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_cm_delete_generic_state (
	ACPI_GENERIC_STATE      *state)
{

	/* If cache is full, just free this state object */

	if (acpi_gbl_generic_state_cache_depth >= MAX_STATE_CACHE_DEPTH) {
		acpi_cm_free (state);
	}

	/* Otherwise put this object back into the cache */

	else {
		acpi_cm_acquire_mutex (ACPI_MTX_CACHES);

		/* Clear the state */

		MEMSET (state, 0, sizeof (ACPI_GENERIC_STATE));
		state->common.data_type = ACPI_DESC_TYPE_STATE;

		/* Put the object at the head of the global cache list */

		state->common.next = acpi_gbl_generic_state_cache;
		acpi_gbl_generic_state_cache = state;
		acpi_gbl_generic_state_cache_depth++;


		acpi_cm_release_mutex (ACPI_MTX_CACHES);
	}
	return;
}


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

void
acpi_cm_delete_generic_state_cache (
	void)
{
	ACPI_GENERIC_STATE      *next;


	/* Traverse the global cache list */

	while (acpi_gbl_generic_state_cache) {
		/* Delete one cached state object */

		next = acpi_gbl_generic_state_cache->common.next;
		acpi_cm_free (acpi_gbl_generic_state_cache);
		acpi_gbl_generic_state_cache = next;
		acpi_gbl_generic_state_cache_depth--;
	}

	return;
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_cm_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_cm_resolve_package_references (
	ACPI_OPERAND_OBJECT     *obj_desc)
{
	u32                 count;
	ACPI_OPERAND_OBJECT *sub_object;

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

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

	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.op_code == AML_ZERO_OP) {
				sub_object->common.type = ACPI_TYPE_NUMBER;
				sub_object->number.value = 0;
			}
			else if (sub_object->reference.op_code == AML_ONE_OP) {
				sub_object->common.type = ACPI_TYPE_NUMBER;
				sub_object->number.value = 1;
			}
			else if (sub_object->reference.op_code == AML_ONES_OP) {
				sub_object->common.type = ACPI_TYPE_NUMBER;
				sub_object->number.value = ACPI_INTEGER_MAX;
			}
		}
	}

	return(AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    _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 from KD table
 *
 ******************************************************************************/

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


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


/*******************************************************************************
 *
 * FUNCTION:    _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 from KD table
 *
 ******************************************************************************/

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

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


/*******************************************************************************
 *
 * FUNCTION:    _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 from KD table
 *
 ******************************************************************************/

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

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