utmisc.c

来自「是关于linux2.5.1的完全源码」· C语言 代码 · 共 1,270 行 · 第 1/3 页

 *
 ******************************************************************************/

void
acpi_ut_delete_generic_state (
	acpi_generic_state      *state)
{
	ACPI_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)
{
	ACPI_FUNCTION_TRACE ("Ut_delete_generic_state_cache");


	acpi_ut_delete_generic_cache (ACPI_MEM_LIST_STATE);
	return_VOID;
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ut_resolve_reference
 *
 * PARAMETERS:  ACPI_PKG_CALLBACK
 *
 * RETURN:      Status          - the status of the call
 *
 * DESCRIPTION: Resolve a reference object to an actual value
 *
 ******************************************************************************/

acpi_status
acpi_ut_resolve_reference (
	u8                      object_type,
	acpi_operand_object     *source_object,
	acpi_generic_state      *state,
	void                    *context)
{
	acpi_pkg_info           *info = (acpi_pkg_info *) context;


	switch (object_type) {
	case ACPI_COPY_TYPE_SIMPLE:

		/*
		 * Simple object - check for a reference
		 */
		if (source_object->common.type == INTERNAL_TYPE_REFERENCE) {
			switch (source_object->reference.opcode) {
			case AML_ZERO_OP:

				source_object->common.type = ACPI_TYPE_INTEGER;
				source_object->integer.value = 0;
				break;

			case AML_ONE_OP:

				source_object->common.type = ACPI_TYPE_INTEGER;
				source_object->integer.value = 1;
				break;

			case AML_ONES_OP:

				source_object->common.type = ACPI_TYPE_INTEGER;
				source_object->integer.value = ACPI_INTEGER_MAX;
				break;
			}
		}
		break;


	case ACPI_COPY_TYPE_PACKAGE:

		/* Package object - nothing much to do here, let the walk handle it */

		info->num_packages++;
		state->pkg.this_target_obj = NULL;
		break;
	}

	return (AE_OK);
}


/*******************************************************************************
 *
 * 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)
{
	acpi_pkg_info           info;
	acpi_status             status;


	ACPI_FUNCTION_TRACE ("Ut_resolve_package_references");


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

		ACPI_REPORT_ERROR (("Expecting a Package object\n"));
		return_ACPI_STATUS (AE_TYPE);
	}

	info.length      = 0;
	info.object_space = 0;
	info.num_packages = 1;

	status = acpi_ut_walk_package_tree (obj_desc, NULL,
			 acpi_ut_resolve_reference, &info);

	return_ACPI_STATUS (status);
}


/*******************************************************************************
 *
 * 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;


	ACPI_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) ||
			(ACPI_GET_DESCRIPTOR_TYPE (this_source_obj) != ACPI_DESC_TYPE_INTERNAL) ||
			(this_source_obj->common.type != ACPI_TYPE_PACKAGE)) {
			status = walk_callback (ACPI_COPY_TYPE_SIMPLE, this_source_obj,
					 state, context);
			if (ACPI_FAILURE (status)) {
				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 subobject of type package */

			status = walk_callback (ACPI_COPY_TYPE_PACKAGE, this_source_obj,
					  state, context);
			if (ACPI_FAILURE (status)) {
				return_ACPI_STATUS (status);
			}

			/*
			 * Push the current state and create a new one
			 * The callback above returned a new target package object.
			 */
			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) {
				return_ACPI_STATUS (AE_NO_MEMORY);
			}
		}
	}

	/* We should never get here */

	return_ACPI_STATUS (AE_AML_INTERNAL);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ut_generate_checksum
 *
 * PARAMETERS:  Buffer          - Buffer to be scanned
 *              Length          - number of bytes to examine
 *
 * RETURN:      checksum
 *
 * DESCRIPTION: Generate a checksum on a raw buffer
 *
 ******************************************************************************/

u8
acpi_ut_generate_checksum (
	u8                      *buffer,
	u32                     length)
{
	u32                     i;
	signed char             sum = 0;

	for (i = 0; i < length; i++) {
		sum = (signed char) (sum + buffer[i]);
	}

	return ((u8) (0 - sum));
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ut_get_resource_end_tag
 *
 * PARAMETERS:  Obj_desc        - The resource template buffer object
 *
 * RETURN:      Pointer to the end tag
 *
 * DESCRIPTION: Find the END_TAG resource descriptor in a resource template
 *
 ******************************************************************************/


u8 *
acpi_ut_get_resource_end_tag (
	acpi_operand_object     *obj_desc)
{
	u8                      buffer_byte;
	u8                      *buffer;
	u8                      *end_buffer;


	buffer    = obj_desc->buffer.pointer;
	end_buffer = buffer + obj_desc->buffer.length;

	while (buffer < end_buffer) {
		buffer_byte = *buffer;
		if (buffer_byte & ACPI_RDESC_TYPE_MASK) {
			/* Large Descriptor - Length is next 2 bytes */

			buffer += ((*(buffer+1) | (*(buffer+2) << 8)) + 3);
		}
		else {
			/* Small Descriptor.  End Tag will be found here */

			if ((buffer_byte & ACPI_RDESC_SMALL_MASK) == ACPI_RDESC_TYPE_END_TAG) {
				/* Found the end tag descriptor, all done. */

				return (buffer);
			}

			/* Length is in the header */

			buffer += ((buffer_byte & 0x07) + 1);
		}
	}

	/* End tag not found */

	return (NULL);
}


/*******************************************************************************
 *
 * 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);
}