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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 * Copyright (c) 2015, Joyent, Inc. All rights reserved. 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 #ifdef __cplusplus 44 extern "C" { 45 #endif 46 47 /* 48 * VM - Information per virtual page. 49 */ 50 struct vpage { 51 uchar_t nvp_prot; /* see <sys/mman.h> prot flags */ 52 uchar_t nvp_advice; /* pplock & <sys/mman.h> madvise flags */ 53 }; 54 55 /* 56 * This was changed from a bitfield to flags/macros in order 57 * to conserve space (uchar_t bitfields are not ANSI). This could 58 * have been condensed to a uchar_t, but at the expense of complexity. 59 * We've stolen three bits from the top of nvp_advice: the first to store 60 * pplock, the second to identify pages for which we have reserved 61 * swap space, but have not necessarily allocated anon slots, and the third to 62 * indicate that the page should be zeroed on fork. 63 * 64 * WARNING: VPP_SETADVICE(vpp, x) evaluates vpp twice, and VPP_PLOCK(vpp) 65 * returns a positive integer when the lock is held, not necessarily (1). 66 */ 67 #define VP_ADVICE_MASK (0x07) 68 #define VP_PPLOCK_MASK (0x80) /* physical page locked by me */ 69 #define VP_PPLOCK_SHIFT (0x07) /* offset of lock hiding inside nvp_advice */ 70 #define VP_SWAPRES_MASK (0x40) /* Swap space has been reserved, but we */ 71 /* might not have allocated an anon slot */ 72 #define VP_INHZERO_MASK (0x20) /* zero page on fork() */ 73 74 #define VPP_PROT(vpp) ((vpp)->nvp_prot) 75 #define VPP_ADVICE(vpp) ((vpp)->nvp_advice & VP_ADVICE_MASK) 76 #define VPP_ISPPLOCK(vpp) \ 77 ((uchar_t)((vpp)->nvp_advice & VP_PPLOCK_MASK)) 78 #define VPP_ISSWAPRES(vpp) \ 79 ((uchar_t)((vpp)->nvp_advice & VP_SWAPRES_MASK)) 80 #define VPP_ISINHZERO(vpp) \ 81 ((uchar_t)((vpp)->nvp_advice & VP_INHZERO_MASK)) 82 83 #define VPP_SETPROT(vpp, x) ((vpp)->nvp_prot = (x)) 84 #define VPP_SETADVICE(vpp, x) \ 85 ((vpp)->nvp_advice = ((vpp)->nvp_advice & ~VP_ADVICE_MASK) | \ 86 ((x) & VP_ADVICE_MASK)) 87 #define VPP_SETPPLOCK(vpp) ((vpp)->nvp_advice |= VP_PPLOCK_MASK) 88 #define VPP_CLRPPLOCK(vpp) ((vpp)->nvp_advice &= ~VP_PPLOCK_MASK) 89 #define VPP_SETSWAPRES(vpp) ((vpp)->nvp_advice |= VP_SWAPRES_MASK) 90 #define VPP_CLRSWAPRES(vpp) ((vpp)->nvp_advice &= ~VP_SWAPRES_MASK) 91 #define VPP_SETINHZERO(vpp) ((vpp)->nvp_advice |= VP_INHZERO_MASK) 92 #define VPP_CLRINHZERO(vpp) ((vpp)->nvp_advice &= ~VP_INHZERO_MASK) 93 94 #ifdef __cplusplus 95 } 96 #endif 97 98 #endif /* _VM_VPAGE_H */ 99