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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License, Version 1.0 only
      6  * (the "License").  You may not use this file except in compliance
      7  * with the License.
      8  *
      9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
     10  * or http://www.opensolaris.org/os/licensing.
     11  * See the License for the specific language governing permissions
     12  * and limitations under the License.
     13  *
     14  * When distributing Covered Code, include this CDDL HEADER in each
     15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     16  * If applicable, add the following below this CDDL HEADER, with the
     17  * fields enclosed by brackets "[]" replaced with your own identifying
     18  * information: Portions Copyright [yyyy] [name of copyright owner]
     19  *
     20  * CDDL HEADER END
     21  */
     22 /*
     23  * Copyright 1998 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
     28 /*	  All Rights Reserved  	*/
     29 
     30 /*
     31  * University Copyright- Copyright (c) 1982, 1986, 1988
     32  * The Regents of the University of California
     33  * All Rights Reserved
     34  *
     35  * University Acknowledgment- Portions of this document are derived from
     36  * software developed by the University of California, Berkeley, and its
     37  * contributors.
     38  */
     39 
     40 #ifndef	_VM_VPAGE_H
     41 #define	_VM_VPAGE_H
     42 
     43 #pragma ident	"@(#)vpage.h	1.23	05/06/08 SMI"
     44 
     45 #ifdef	__cplusplus
     46 extern "C" {
     47 #endif
     48 
     49 /*
     50  * VM - Information per virtual page.
     51  */
     52 struct vpage {
     53 	uchar_t nvp_prot;	/* see <sys/mman.h> prot flags */
     54 	uchar_t nvp_advice;	/* pplock & <sys/mman.h> madvise flags */
     55 };
     56 
     57 /*
     58  * This was changed from a bitfield to flags/macros in order
     59  * to conserve space (uchar_t bitfields are not ANSI).  This could
     60  * have been condensed to a uchar_t, but at the expense of complexity.
     61  * We've stolen a bit from the top of nvp_advice to store pplock in.
     62  *
     63  * WARNING: VPP_SETADVICE(vpp, x) evaluates vpp twice, and VPP_PLOCK(vpp)
     64  * returns a positive integer when the lock is held, not necessarily (1).
     65  */
     66 #define	VP_ADVICE_MASK	(0x07)
     67 #define	VP_PPLOCK_MASK	(0x80)	/* physical page locked by me */
     68 #define	VP_PPLOCK_SHIFT	(0x07)	/* offset of lock hiding inside nvp_advice */
     69 
     70 #define	VPP_PROT(vpp)	((vpp)->nvp_prot)
     71 #define	VPP_ADVICE(vpp)	((vpp)->nvp_advice & VP_ADVICE_MASK)
     72 #define	VPP_ISPPLOCK(vpp) \
     73 	((uchar_t)((vpp)->nvp_advice & VP_PPLOCK_MASK))
     74 
     75 #define	VPP_SETPROT(vpp, x)	((vpp)->nvp_prot = (x))
     76 #define	VPP_SETADVICE(vpp, x) \
     77 	((vpp)->nvp_advice = ((vpp)->nvp_advice & ~VP_ADVICE_MASK) | \
     78 		((x) & VP_ADVICE_MASK))
     79 #define	VPP_SETPPLOCK(vpp)	((vpp)->nvp_advice |= VP_PPLOCK_MASK)
     80 #define	VPP_CLRPPLOCK(vpp)	((vpp)->nvp_advice &= ~VP_PPLOCK_MASK)
     81 
     82 #ifdef	__cplusplus
     83 }
     84 #endif
     85 
     86 #endif	/* _VM_VPAGE_H */
     87