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Diffstat (limited to 'usr/src/uts/common/sys/swap.h')
| -rw-r--r-- | usr/src/uts/common/sys/swap.h | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/usr/src/uts/common/sys/swap.h b/usr/src/uts/common/sys/swap.h new file mode 100644 index 0000000000..9bba487ec1 --- /dev/null +++ b/usr/src/uts/common/sys/swap.h @@ -0,0 +1,255 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License, Version 1.0 only + * (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 + * or http://www.opensolaris.org/os/licensing. + * 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 2005 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + */ + +/* Copyright (c) 1983, 1984, 1985, 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 _SYS_SWAP_H +#define _SYS_SWAP_H + +#pragma ident "%Z%%M% %I% %E% SMI" + +#include <sys/isa_defs.h> +#include <sys/feature_tests.h> +#include <vm/anon.h> +#include <sys/fs/swapnode.h> + +#ifdef __cplusplus +extern "C" { +#endif + +#if !defined(_LP64) && _FILE_OFFSET_BITS == 64 +#error "Cannot use swapctl in the large files compilation environment" +#endif + +/* The following are for the swapctl system call */ + +#define SC_ADD 1 /* add a specified resource for swapping */ +#define SC_LIST 2 /* list all the swapping resources */ +#define SC_REMOVE 3 /* remove the specified swapping resource */ +#define SC_GETNSWP 4 /* get number of swap resources configured */ +#define SC_AINFO 5 /* get anonymous memory resource information */ + +typedef struct swapres { + char *sr_name; /* pathname of the resource specified */ + off_t sr_start; /* starting offset of the swapping resource */ + off_t sr_length; /* length of the swap area */ +} swapres_t; + +typedef struct swapent { + char *ste_path; /* get the name of the swap file */ + off_t ste_start; /* starting block for swapping */ + off_t ste_length; /* length of swap area */ + long ste_pages; /* numbers of pages for swapping */ + long ste_free; /* numbers of ste_pages free */ + int ste_flags; /* see below */ +} swapent_t; + +typedef struct swaptable { + int swt_n; /* number of swapents following */ + struct swapent swt_ent[1]; /* array of swt_n swapents */ +} swaptbl_t; + + +#if defined(_SYSCALL32) + +/* Kernel's view of user ILP32 swapres and swapent structures */ + +typedef struct swapres32 { + caddr32_t sr_name; /* pathname of the resource specified */ + off32_t sr_start; /* starting offset of the swapping resource */ + off32_t sr_length; /* length of the swap area */ +} swapres32_t; + +typedef struct swapent32 { + caddr32_t ste_path; /* get the name of the swap file */ + off32_t ste_start; /* starting block for swapping */ + off32_t ste_length; /* length of swap area */ + int32_t ste_pages; /* numbers of pages for swapping */ + int32_t ste_free; /* numbers of ste_pages free */ + int32_t ste_flags; /* see below */ +} swapent32_t; + +typedef struct swaptable32 { + int32_t swt_n; /* number of swapents following */ + struct swapent32 swt_ent[1]; /* array of swt_n swapents */ +} swaptbl32_t; + +#endif /* _SYSCALL32 */ + +#if defined(_KERNEL) +extern int swapctl(int, void *, int *); +#if defined(_LP64) && defined(_SYSCALL32) +extern int swapctl32(int, void *, int *); +#endif /* _LP64 && _SYSCALL32 */ +#else /* !_KERNEL */ +#if defined(__STDC__) +extern int swapctl(int, void *); +#else +extern int swapctl(); +#endif +#endif /* _KERNEL */ + + +/* ste_flags values */ + +#define ST_INDEL 0x01 /* Deletion of file is in progress. */ + /* Prevents others from deleting or */ + /* allocating from it */ +#define ST_DOINGDEL 0x02 /* Set during deletion of file */ + /* Clearing during deletion signals */ + /* that you want to add the file back */ + /* again, and will eventually cause */ + /* it to be added back */ + +/* + * VM - virtual swap device. + */ +struct swapinfo { + ulong_t si_soff; /* starting offset (bytes) of file */ + ulong_t si_eoff; /* ending offset (bytes) of file */ + struct vnode *si_vp; /* vnode (commonvp if device) */ + struct swapinfo *si_next; /* next swap area */ + int si_allocs; /* # of conseq. allocs from this area */ + short si_flags; /* flags defined below */ + pgcnt_t si_npgs; /* number of pages of swap space */ + pgcnt_t si_nfpgs; /* number of free pages of swap space */ + int si_pnamelen; /* swap file name length + 1 */ + char *si_pname; /* swap file name */ + ssize_t si_mapsize; /* # bytes allocated for bitmap */ + uint_t *si_swapslots; /* bitmap of slots, unset == free */ + pgcnt_t si_hint; /* first page to check if free */ + ssize_t si_checkcnt; /* # of checks to find freeslot */ + ssize_t si_alloccnt; /* used to find ave checks */ +}; + +/* + * Stuff to convert an anon slot pointer to a page name. + * Because the address of the slot (ap) is a unique identifier, we + * use it to generate a unique (vp,off), as shown below. + * + * |<-- 11 bits -->|<------32 - 11 --------->| + * vp index bits off bits + * + * The off bits are shifted PAGESHIFT to directly form a page aligned + * offset; the vp index bits map 1-1 to a vnode. + * + * Note: if we go to 64 bit offsets, we could use all the bits as the + * unique offset and just have one vnode. + */ +#define AN_OFFSHIFT 11 /* vnum # bits */ +#define AN_VPSHIFT 21 /* 32 - 11 */ +#define AN_VPSIZEMASK 0x7FF /* vp index mask */ +#define MAX_SWAP_VNODES 2048 /* 1 << AN_OFFSHIFT */ +#define AN_CACHE_ALIGN 16 /* anon address aligned */ + /* 16 bytes */ +/* + * Convert from an anon slot to associated vnode and offset. + */ +#define swap_xlate(AP, VPP, OFFP) \ +{ \ + *(VPP) = (AP)->an_vp; \ + *(OFFP) = (AP)->an_off; \ +} +#define swap_xlate_nopanic swap_xlate + +/* + * Get a vnode name for an anon slot. + * The vnum, offset are derived from anon struct address which is + * 16 bytes aligned. To get swap offset the anon address is shifted + * by additional 11 bits which yields 32K aligned swap offset + * (11 bits plus 4 bits alignment). + * The vnum (vnode index) is created from bits 31-21. + * The 64 bit swap offset is created from bits 63-32 and 20-4. + * The 32 bit offset is created from bits 20-4. + * + * +-----------...----------+--------+-----------------------+----+ + * | swap offset | vnum | swap offset |0000| + * +-----------...----------+--------+-----------------------+----+ + * 63 32 31 21 20 4 3 0 + */ +#define swap_alloc(AP) \ +{ \ + (AP)->an_vp = swapfs_getvp(((uintptr_t)(AP) >> AN_VPSHIFT) \ + & AN_VPSIZEMASK); \ + (AP)->an_off = (anoff_t)(((uintptr_t)(AP) & ~(uintptr_t)0xFFFFFFFF) \ + | (((uintptr_t)(AP) << AN_OFFSHIFT) & (uintptr_t)0xFFFFFFFF)); \ +} + +/* + * Free the page name for the specified anon slot. + * For now there's nothing to do. + */ +#define swap_free(AP) + +/* Flags for swap_phys_alloc */ +#define SA_NOT 0x01 /* Must have slot from swap dev other than input one */ + +/* Special error codes for swap_newphysname() */ +#define SE_NOSWAP -1 /* No physical swap slots available */ +#define SE_NOANON -2 /* No anon slot for swap slot */ + +#ifdef _KERNEL +extern struct anon *swap_anon(struct vnode *vp, u_offset_t off); +extern int swap_phys_alloc(struct vnode **vpp, u_offset_t *offp, size_t *lenp, + uint_t flags); +extern void swap_phys_free(struct vnode *vp, u_offset_t off, size_t len); +extern int swap_getphysname(struct vnode *vp, u_offset_t off, + struct vnode **pvpp, u_offset_t *poffp); +extern int swap_newphysname(struct vnode *vp, u_offset_t offset, + u_offset_t *offp, size_t *lenp, struct vnode **pvpp, u_offset_t *poffp); + +extern struct swapinfo *swapinfo; +extern int swap_debug; +#endif /* _KERNEL */ + +#ifdef SWAP_DEBUG +#define SW_RENAME 0x01 +#define SW_RESV 0x02 +#define SW_ALLOC 0x04 +#define SW_CTL 0x08 +#define SWAP_PRINT(f, s, x1, x2, x3, x4, x5) \ + if (swap_debug & f) \ + printf(s, x1, x2, x3, x4, x5); +#else /* SWAP_DEBUG */ +#define SWAP_PRINT(f, s, x1, x2, x3, x4, x5) +#endif /* SWAP_DEBUG */ + +#ifdef __cplusplus +} +#endif + +#endif /* _SYS_SWAP_H */ |