vpage.h revision 9d12795f87b63c2e39e87bff369182edd34677d3
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
* Copyright (c) 2015, Joyent, Inc. All rights reserved.
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* University Copyright- Copyright (c) 1982, 1986, 1988
* The Regents of the University of California
* All Rights Reserved
*
* University Acknowledgment- Portions of this document are derived from
* software developed by the University of California, Berkeley, and its
* contributors.
*/
#ifndef _VM_VPAGE_H
#define _VM_VPAGE_H
#ifdef __cplusplus
extern "C" {
#endif
/*
* VM - Information per virtual page.
*/
struct vpage {
};
/*
* to conserve space (uchar_t bitfields are not ANSI). This could
* have been condensed to a uchar_t, but at the expense of complexity.
* We've stolen three bits from the top of nvp_advice: the first to store
* pplock, the second to identify pages for which we have reserved
* swap space, but have not necessarily allocated anon slots, and the third to
* indicate that the page should be zeroed on fork.
*
* WARNING: VPP_SETADVICE(vpp, x) evaluates vpp twice, and VPP_PLOCK(vpp)
* returns a positive integer when the lock is held, not necessarily (1).
*/
#define VP_ADVICE_MASK (0x07)
/* might not have allocated an anon slot */
#define VPP_ISPPLOCK(vpp) \
#define VPP_ISSWAPRES(vpp) \
#define VPP_ISINHZERO(vpp) \
#define VPP_SETADVICE(vpp, x) \
((x) & VP_ADVICE_MASK))
#ifdef __cplusplus
}
#endif
#endif /* _VM_VPAGE_H */