path: root/include/mach/memory_object.defs

/* 
 * 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;

#ifdef	KERNEL
#include <norma_vm.h>
#if	NORMA_VM
userprefix k_;
#endif	NORMA_VM
#endif	KERNEL

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

#if	SEQNOS
serverprefix seqnos_;
serverdemux seqnos_memory_object_server;
#endif	SEQNOS

/*
 *	Initialize the specified memory object, providing
 *	a reqeust port on which control calls can be made, and
 *	a name port that identifies this object to callers of
 *	vm_regions.
 *	[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.]
 */
simpleroutine	memory_object_init(
		memory_object		: memory_object_t;
#if	SEQNOS
	msgseqno seqno			: mach_port_seqno_t;
#endif	SEQNOS
		memory_control		: memory_object_control_t =
						MACH_MSG_TYPE_MAKE_SEND
						ctype: mach_port_t;
		memory_object_name	: memory_object_name_t =
						MACH_MSG_TYPE_MAKE_SEND
						ctype: mach_port_t;
		memory_object_page_size	: vm_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.  No further calls will be made on
 *	the memory object by this kernel.
 *
 *	[All rights to the control and name ports are included
 *	in this call.  The memory manager should use port_deallocate
 *	to release them once they are no longer needed.]
 */
simpleroutine	memory_object_terminate(
		memory_object		: memory_object_t =
						MACH_MSG_TYPE_MOVE_SEND
						ctype: mach_port_t;
#if	SEQNOS
	msgseqno seqno			: mach_port_seqno_t;
#endif	SEQNOS
		memory_control		: memory_object_control_t =
						MACH_MSG_TYPE_MOVE_RECEIVE
						ctype: mach_port_t
#if	KERNEL_USER
		/* for compatibility with Mach 2.5 kernels */
						, dealloc
#endif	KERNEL_USER
						;
		memory_object_name	: memory_object_name_t =
						MACH_MSG_TYPE_MOVE_RECEIVE
						ctype: mach_port_t
#if	KERNEL_USER
		/* for compatibility with Mach 2.5 kernels */
						, dealloc
#endif	KERNEL_USER
						);

/*
 *	Indicates that a copy has been made of the specified range of
 *	the given original memory object.  The kernel will use the new
 *	memory object, control and name ports to refer to the new copy
 *	(once the memory manager has asserted its "ready" attribute).
 *
 *	Cached pages from the original memory object at the time of
 *	the copy operation are handled as follows:
 *		Readable pages may be silently copied to the new
 *		 memory object (with all access permissions).
 *		Pages not copied are locked to prevent write access.
 *
 *	This call includes only the new memory object itself; a
 *	memory_object_init call will be made on the new memory
 *	object after the actions above are completed.
 *
 *	The new memory object is *temporary*, meaning that the
 *	memory manager should not change its contents or allow
 *	the memory object to be mapped in another client.  The
 *	memory manager may use the memory_object_data_unavailable
 *	call to indicate that the appropriate page of the original
 *	memory object may be used to fulfill a data request.
 *
 *	[Reply should be memory_object_set_attributes on the
 *	new memory object control port to indicate readiness.]
 */
simpleroutine	memory_object_copy(
		old_memory_object	: memory_object_t;
#if	SEQNOS
	msgseqno seqno			: mach_port_seqno_t;
#endif	SEQNOS
		old_memory_control	: memory_object_control_t =
						MACH_MSG_TYPE_MAKE_SEND
						ctype: mach_port_t;
		offset			: vm_offset_t;
		length			: vm_size_t;
		new_memory_object	: memory_object_t =
						MACH_MSG_TYPE_MOVE_RECEIVE
						ctype: mach_port_t
#if	KERNEL_USER
		/* for compatibility with Mach 2.5 kernels */
						, dealloc
#endif	KERNEL_USER
						);

/*
 *	Request data from this memory object.  At least
 *	the specified data should be returned with at
 *	least the specified access permitted.
 *
 *	[Reply should be memory_object_data_provided.]
 */
simpleroutine	memory_object_data_request(
		memory_object		: memory_object_t;
#if	SEQNOS
	msgseqno seqno			: mach_port_seqno_t;
#endif	SEQNOS
		memory_control		: memory_object_control_t =
						MACH_MSG_TYPE_MAKE_SEND
						ctype: mach_port_t;
		offset			: vm_offset_t;
		length			: vm_size_t;
		desired_access		: vm_prot_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.
 *
 *	[Reply should be memory_object_lock_request.]
 */
simpleroutine	memory_object_data_unlock(
		memory_object		: memory_object_t;
#if	SEQNOS
	msgseqno seqno			: mach_port_seqno_t;
#endif	SEQNOS
		memory_control		: memory_object_control_t =
						MACH_MSG_TYPE_MAKE_SEND
						ctype: mach_port_t;
		offset			: vm_offset_t;
		length			: vm_size_t;
		desired_access		: vm_prot_t);

/*
 *	Write back modifications made to this portion of
 *	the memory object while in memory.
 *
 *	Unless explicitly requested by a memory_object_lock_request
 *	(clean, but not flush),	the kernel will not retain
 *	the data.
 *
 *	[Reply should be vm_deallocate to release the data.]
 */
simpleroutine	memory_object_data_write(
		memory_object		: memory_object_t;
#if	SEQNOS
	msgseqno seqno			: mach_port_seqno_t;
#endif	SEQNOS
		memory_control		: memory_object_control_t =
						MACH_MSG_TYPE_MAKE_SEND
						ctype: mach_port_t;
		offset			: vm_offset_t;
		data			: pointer_t);

/*
 *	Indicate that a previous memory_object_lock_reqeust has been
 *	completed.  Note that this call is made on whatever
 *	port is specified in the memory_object_lock_request; that port
 *	need not be the memory object port itself.
 *
 *	[No reply expected.]
 */
simpleroutine	memory_object_lock_completed(
		memory_object		: memory_object_t =
			polymorphic|MACH_MSG_TYPE_PORT_SEND_ONCE
			ctype: mach_port_t;
#if	SEQNOS
	msgseqno seqno			: mach_port_seqno_t;
#endif	SEQNOS
		memory_control		: memory_object_control_t =
						MACH_MSG_TYPE_MAKE_SEND
						ctype: mach_port_t;
		offset			: vm_offset_t;
		length			: vm_size_t);

/*
 *	Indicate that a previous memory_object_data_supply has been
 *	completed.  Note that this call is made on whatever
 *	port is specified in the memory_object_data_supply; that port
 *	need not be the memory object port itself.
 *
 *	The result parameter indicates what happened during the supply.
 *	If it is not KERN_SUCCESS, then error_offset identifies the
 *	first offset at which a problem occurred.  The pagein operation
 *	stopped at this point.  Note that the only failures reported
 *	by this mechanism are KERN_MEMORY_PRESENT.  All other failures
 *	(invalid argument, error on pagein of supplied data in manager's
 *	address space) cause the entire operation to fail.
 *
 *	XXX Check what actually happens in latter case!
 *
 *	[No reply expected.]
 */
simpleroutine	memory_object_supply_completed(
		memory_object		: memory_object_t =
			polymorphic|MACH_MSG_TYPE_PORT_SEND_ONCE
			ctype: mach_port_t;
#if	SEQNOS
	msgseqno seqno			: mach_port_seqno_t;
#endif	SEQNOS
		memory_control		: memory_object_control_t =
						MACH_MSG_TYPE_MAKE_SEND
						ctype: mach_port_t;
		offset		 	: vm_offset_t;
		length		 	: vm_size_t;
		result		 	: kern_return_t;
		error_offset	 	: vm_offset_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.
 *
 *	[Reply should be vm_deallocate to release the data.]
 */
simpleroutine   memory_object_data_return(
		memory_object		: memory_object_t;
#if	SEQNOS
	msgseqno seqno			: mach_port_seqno_t;
#endif	SEQNOS
		memory_control		: memory_object_control_t =
						MACH_MSG_TYPE_MAKE_SEND
						ctype: mach_port_t;
		offset		 	: vm_offset_t;
		data		 	: pointer_t;
		dirty			: boolean_t;
		kernel_copy		: boolean_t);

/*
 * XXX	Warning:  This routine does NOT contain a memory_object_control_t
 * XXX	because the memory_object_change_attributes call may cause
 * XXX  memory object termination (by uncaching the object).  This would
 * XXX  yield an invalid port.
 */

simpleroutine	memory_object_change_completed(
		memory_object		: memory_object_t =
			polymorphic|MACH_MSG_TYPE_PORT_SEND_ONCE
			ctype: mach_port_t;
#if	SEQNOS
	msgseqno seqno			: mach_port_seqno_t;
#endif	SEQNOS
		may_cache		: boolean_t;
		copy_strategy		: memory_object_copy_strategy_t);