xnu-2782.40.9.tar.gz

[apple/xnu.git] / osfmk / mach / memory_object.defs

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/*
 * @OSF_COPYRIGHT@
 */
/* 
 * Mach Operating System
 * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
 * All Rights Reserved.
 * 
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 * 
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 * 
 * Carnegie Mellon requests users of this software to return to
 * 
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 * 
 * any improvements or extensions that they make and grant Carnegie Mellon
 * the rights to redistribute these changes.
 */
/*
 */
/*
 * File:	mach/memory_object.defs
 *
 * Abstract:
 *	Basic Mach external memory management interface declaration.
 */

subsystem
#if	KERNEL_USER
	  KernelUser
#endif	/* KERNEL_USER */
#if	KERNEL_SERVER
	  KernelServer
#endif	/* KERNEL_SERVER */
		     memory_object 2200;

#include <mach/std_types.defs>
#include <mach/mach_types.defs>

#if	KERNEL_SERVER
serverprefix dp_;
#endif

/*
 *	Initialize the specified memory object, providing
 *	a memory object control reference on which to make
 *   cache control calls.
 *	[To allow the mapping of this object to be used, the
 *	memory manager must call memory_object_set_attributes,
 *	specifying the "ready" parameter as TRUE.  To reject
 *	all mappings of this object, the memory manager may
 *	use memory_object_destroy.]
 */
routine	memory_object_init(
		memory_object		: memory_object_t;
		memory_control	: memory_object_control_t;
		memory_object_page_size	: memory_object_cluster_size_t);


/*
 *	Indicates that the specified memory object is no longer
 *	mapped (or cached -- see memory_object_set_attributes),
 *	and that further mappings will cause another memory_object_init
 *	call to be made.  
 *
 *	[The kernel will release its reference on the memory object
 *	after this call returns.  The memory object control associated
 *	with the memory object is no longer usable - the pager should
 *	drop the control reference granted to it by memory_object_init.]
 */
routine	memory_object_terminate(
		memory_object		: memory_object_t);

/*
 *	Request data from this memory object.  At least
 *	the specified data should be returned with at
 *	least the specified access permitted.
 *
 *	[Response should be upl commit over the specified range.]
 */
routine	memory_object_data_request(
		memory_object		: memory_object_t;
		offset			: memory_object_offset_t;
		length			: memory_object_cluster_size_t;
		desired_access		: vm_prot_t;
		fault_info		: memory_object_fault_info_t);

/*
 *	Return data to manager.  This call is used in place of data_write
 *	for objects initialized by object_ready instead of set_attributes.
 *	This call indicates whether the returned data is dirty and whether
 *	the kernel kept a copy.  Precious data remains precious if the
 *	kernel keeps a copy.  The indication that the kernel kept a copy
 *	is only a hint if the data is not precious; the cleaned copy may
 *	be discarded without further notifying the manager.
 *
 *	[response should be a upl_commit over the range specified]
 */
routine   memory_object_data_return(
		memory_object		: memory_object_t;
		offset		 	: memory_object_offset_t;
		size			: memory_object_cluster_size_t;
	out	resid_offset	 	: memory_object_offset_t;
	out	io_error		: int;
		dirty			: boolean_t;
		kernel_copy		: boolean_t;
		upl_flags		: int);

/*
 *	Provide initial data contents for this region of
 *	the memory object.  If data has already been written
 *	to the object, this value must be discarded; otherwise,
 *	this call acts identically to memory_object_data_return.
 *
 *	[response should be UPL commit over the specified range.]
 */
routine	memory_object_data_initialize(
		memory_object		: memory_object_t;
		offset			: memory_object_offset_t;
		size			: memory_object_cluster_size_t);

/*
 *	Request that the specified portion of this
 *	memory object be unlocked to allow the specified
 *	forms of access; the kernel already has the data.
 *
 *	[Response should be memory_object_lock_request when
 *	the operation is fully complete.]
 */
routine	memory_object_data_unlock(
		memory_object		: memory_object_t;
		offset			: memory_object_offset_t;
		size			: memory_object_size_t;
		desired_access		: vm_prot_t);


/*
 *	Request that the specified portion of this
 *	memory object be synchronized with its backing
 *	store according to the supplied flags.
 *
 *	[Response should be memory_object_synchronize_completed when
 *	the operation is fully complete.]
 */
routine memory_object_synchronize(
		memory_object           : memory_object_t;
		offset          	: memory_object_offset_t;
		size	          	: memory_object_size_t;
		sync_flags 	     	: vm_sync_t );

/*
 *	Notify the pager that the specified memory object
 *	has no other (mapped) references besides the named
 *	reference held by the pager itself.
 *
 *	[Response should be a release of the named reference when
 *	the pager deems that appropriate.]
 */
routine memory_object_map(
		memory_object		: memory_object_t;
		prot			: vm_prot_t);
routine memory_object_last_unmap(
		memory_object           : memory_object_t);

routine	memory_object_data_reclaim(
		memory_object		: memory_object_t;
		reclaim_backing_store	: boolean_t);

/* vim: set ft=c : */