xref: /illumos-gate/usr/src/uts/common/vm/vpage.h (revision b4203d75)
17c478bd9Sstevel@tonic-gate /*
27c478bd9Sstevel@tonic-gate  * CDDL HEADER START
37c478bd9Sstevel@tonic-gate  *
47c478bd9Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
567256803Srh  * Common Development and Distribution License (the "License").
667256803Srh  * You may not use this file except in compliance with the License.
77c478bd9Sstevel@tonic-gate  *
87c478bd9Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
97c478bd9Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
107c478bd9Sstevel@tonic-gate  * See the License for the specific language governing permissions
117c478bd9Sstevel@tonic-gate  * and limitations under the License.
127c478bd9Sstevel@tonic-gate  *
137c478bd9Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
147c478bd9Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
157c478bd9Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
167c478bd9Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
177c478bd9Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
187c478bd9Sstevel@tonic-gate  *
197c478bd9Sstevel@tonic-gate  * CDDL HEADER END
207c478bd9Sstevel@tonic-gate  */
217c478bd9Sstevel@tonic-gate /*
2267256803Srh  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
237c478bd9Sstevel@tonic-gate  * Use is subject to license terms.
249d12795fSRobert Mustacchi  * Copyright (c) 2015, Joyent, Inc.  All rights reserved.
257c478bd9Sstevel@tonic-gate  */
267c478bd9Sstevel@tonic-gate 
277c478bd9Sstevel@tonic-gate /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
28*b4203d75SMarcel Telka /*	  All Rights Reserved	*/
297c478bd9Sstevel@tonic-gate 
307c478bd9Sstevel@tonic-gate /*
317c478bd9Sstevel@tonic-gate  * University Copyright- Copyright (c) 1982, 1986, 1988
327c478bd9Sstevel@tonic-gate  * The Regents of the University of California
337c478bd9Sstevel@tonic-gate  * All Rights Reserved
347c478bd9Sstevel@tonic-gate  *
357c478bd9Sstevel@tonic-gate  * University Acknowledgment- Portions of this document are derived from
367c478bd9Sstevel@tonic-gate  * software developed by the University of California, Berkeley, and its
377c478bd9Sstevel@tonic-gate  * contributors.
387c478bd9Sstevel@tonic-gate  */
397c478bd9Sstevel@tonic-gate 
407c478bd9Sstevel@tonic-gate #ifndef	_VM_VPAGE_H
417c478bd9Sstevel@tonic-gate #define	_VM_VPAGE_H
427c478bd9Sstevel@tonic-gate 
437c478bd9Sstevel@tonic-gate #ifdef	__cplusplus
447c478bd9Sstevel@tonic-gate extern "C" {
457c478bd9Sstevel@tonic-gate #endif
467c478bd9Sstevel@tonic-gate 
477c478bd9Sstevel@tonic-gate /*
487c478bd9Sstevel@tonic-gate  * VM - Information per virtual page.
497c478bd9Sstevel@tonic-gate  */
507c478bd9Sstevel@tonic-gate struct vpage {
517c478bd9Sstevel@tonic-gate 	uchar_t nvp_prot;	/* see <sys/mman.h> prot flags */
527c478bd9Sstevel@tonic-gate 	uchar_t nvp_advice;	/* pplock & <sys/mman.h> madvise flags */
537c478bd9Sstevel@tonic-gate };
547c478bd9Sstevel@tonic-gate 
557c478bd9Sstevel@tonic-gate /*
567c478bd9Sstevel@tonic-gate  * This was changed from a bitfield to flags/macros in order
577c478bd9Sstevel@tonic-gate  * to conserve space (uchar_t bitfields are not ANSI).  This could
587c478bd9Sstevel@tonic-gate  * have been condensed to a uchar_t, but at the expense of complexity.
599d12795fSRobert Mustacchi  * We've stolen three bits from the top of nvp_advice: the first to store
609d12795fSRobert Mustacchi  * pplock, the second to identify pages for which we have reserved
619d12795fSRobert Mustacchi  * swap space, but have not necessarily allocated anon slots, and the third to
629d12795fSRobert Mustacchi  * indicate that the page should be zeroed on fork.
637c478bd9Sstevel@tonic-gate  *
647c478bd9Sstevel@tonic-gate  * WARNING: VPP_SETADVICE(vpp, x) evaluates vpp twice, and VPP_PLOCK(vpp)
657c478bd9Sstevel@tonic-gate  * returns a positive integer when the lock is held, not necessarily (1).
667c478bd9Sstevel@tonic-gate  */
677c478bd9Sstevel@tonic-gate #define	VP_ADVICE_MASK	(0x07)
687c478bd9Sstevel@tonic-gate #define	VP_PPLOCK_MASK	(0x80)	/* physical page locked by me */
697c478bd9Sstevel@tonic-gate #define	VP_PPLOCK_SHIFT	(0x07)	/* offset of lock hiding inside nvp_advice */
7067256803Srh #define	VP_SWAPRES_MASK	(0x40)	/* Swap space has been reserved, but we */
7167256803Srh 				/* might not have allocated an anon slot */
729d12795fSRobert Mustacchi #define	VP_INHZERO_MASK	(0x20)	/* zero page on fork() */
737c478bd9Sstevel@tonic-gate 
747c478bd9Sstevel@tonic-gate #define	VPP_PROT(vpp)	((vpp)->nvp_prot)
757c478bd9Sstevel@tonic-gate #define	VPP_ADVICE(vpp)	((vpp)->nvp_advice & VP_ADVICE_MASK)
767c478bd9Sstevel@tonic-gate #define	VPP_ISPPLOCK(vpp) \
777c478bd9Sstevel@tonic-gate 	((uchar_t)((vpp)->nvp_advice & VP_PPLOCK_MASK))
7867256803Srh #define	VPP_ISSWAPRES(vpp) \
7967256803Srh 	((uchar_t)((vpp)->nvp_advice & VP_SWAPRES_MASK))
809d12795fSRobert Mustacchi #define	VPP_ISINHZERO(vpp) \
819d12795fSRobert Mustacchi 	((uchar_t)((vpp)->nvp_advice & VP_INHZERO_MASK))
827c478bd9Sstevel@tonic-gate 
837c478bd9Sstevel@tonic-gate #define	VPP_SETPROT(vpp, x)	((vpp)->nvp_prot = (x))
847c478bd9Sstevel@tonic-gate #define	VPP_SETADVICE(vpp, x) \
857c478bd9Sstevel@tonic-gate 	((vpp)->nvp_advice = ((vpp)->nvp_advice & ~VP_ADVICE_MASK) | \
867c478bd9Sstevel@tonic-gate 		((x) & VP_ADVICE_MASK))
877c478bd9Sstevel@tonic-gate #define	VPP_SETPPLOCK(vpp)	((vpp)->nvp_advice |= VP_PPLOCK_MASK)
887c478bd9Sstevel@tonic-gate #define	VPP_CLRPPLOCK(vpp)	((vpp)->nvp_advice &= ~VP_PPLOCK_MASK)
8967256803Srh #define	VPP_SETSWAPRES(vpp)	((vpp)->nvp_advice |= VP_SWAPRES_MASK)
9067256803Srh #define	VPP_CLRSWAPRES(vpp)	((vpp)->nvp_advice &= ~VP_SWAPRES_MASK)
919d12795fSRobert Mustacchi #define	VPP_SETINHZERO(vpp)	((vpp)->nvp_advice |= VP_INHZERO_MASK)
929d12795fSRobert Mustacchi #define	VPP_CLRINHZERO(vpp)	((vpp)->nvp_advice &= ~VP_INHZERO_MASK)
937c478bd9Sstevel@tonic-gate 
947c478bd9Sstevel@tonic-gate #ifdef	__cplusplus
957c478bd9Sstevel@tonic-gate }
967c478bd9Sstevel@tonic-gate #endif
977c478bd9Sstevel@tonic-gate 
987c478bd9Sstevel@tonic-gate #endif	/* _VM_VPAGE_H */
99