uvm_extern.h

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/*	$NetBSD: uvm_extern.h,v 1.55 2000/11/30 11:04:43 simonb Exp $	*/

/*
 *
 * Copyright (c) 1997 Charles D. Cranor and Washington University.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Charles D. Cranor and
 *      Washington University.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * from: Id: uvm_extern.h,v 1.1.2.21 1998/02/07 01:16:53 chs Exp
 */

/*-
 * Copyright (c) 1991, 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)vm_extern.h	8.5 (Berkeley) 5/3/95
 */

#ifndef _UVM_UVM_EXTERN_H_
#define _UVM_UVM_EXTERN_H_

/*
 * uvm_extern.h: this file defines the external interface to the VM system.
 *
 * this should be the only file included by non-VM parts of the kernel
 * which need access to VM services.   if you want to know the interface
 * to the MI VM layer without knowing the details, this is the file to
 * learn.
 *
 * NOTE: vm system calls are prototyped in syscallargs.h
 */

/*
 * typedefs, necessary for standard UVM headers.
 */

typedef unsigned int  uvm_flag_t;
typedef int vm_fault_t;

typedef int vm_inherit_t;	/* XXX: inheritance codes */
typedef off_t voff_t;		/* XXX: offset within a uvm_object */

union vm_map_object;
typedef union vm_map_object vm_map_object_t;

struct vm_map_entry;
typedef struct vm_map_entry *vm_map_entry_t;

struct vm_map;
typedef struct vm_map *vm_map_t;

struct vm_page;
typedef struct vm_page  *vm_page_t;

/*
 * defines
 */

/*
 * the following defines are for uvm_map and functions which call it.
 */

/* protections bits */
#define UVM_PROT_MASK	0x07	/* protection mask */
#define UVM_PROT_NONE	0x00	/* protection none */
#define UVM_PROT_ALL	0x07	/* everything */
#define UVM_PROT_READ	0x01	/* read */
#define UVM_PROT_WRITE  0x02	/* write */
#define UVM_PROT_EXEC	0x04	/* exec */

/* protection short codes */
#define UVM_PROT_R	0x01	/* read */
#define UVM_PROT_W	0x02	/* write */
#define UVM_PROT_RW	0x03    /* read-write */
#define UVM_PROT_X	0x04	/* exec */
#define UVM_PROT_RX	0x05	/* read-exec */
#define UVM_PROT_WX	0x06	/* write-exec */
#define UVM_PROT_RWX	0x07	/* read-write-exec */

/* 0x08: not used */

/* inherit codes */
#define UVM_INH_MASK	0x30	/* inherit mask */
#define UVM_INH_SHARE	0x00	/* "share" */
#define UVM_INH_COPY	0x10	/* "copy" */
#define UVM_INH_NONE	0x20	/* "none" */
#define UVM_INH_DONATE	0x30	/* "donate" << not used */

/* 0x40, 0x80: not used */

/* bits 0x700: max protection, 0x800: not used */

/* bits 0x7000: advice, 0x8000: not used */
/* advice: matches MADV_* from sys/mman.h */
#define UVM_ADV_NORMAL	0x0	/* 'normal' */
#define UVM_ADV_RANDOM	0x1	/* 'random' */
#define UVM_ADV_SEQUENTIAL 0x2	/* 'sequential' */
/* 0x3: will need, 0x4: dontneed */
#define UVM_ADV_MASK	0x7	/* mask */

/* mapping flags */
#define UVM_FLAG_FIXED   0x010000 /* find space */
#define UVM_FLAG_OVERLAY 0x020000 /* establish overlay */
#define UVM_FLAG_NOMERGE 0x040000 /* don't merge map entries */
#define UVM_FLAG_COPYONW 0x080000 /* set copy_on_write flag */
#define UVM_FLAG_AMAPPAD 0x100000 /* for bss: pad amap to reduce malloc() */
#define UVM_FLAG_TRYLOCK 0x200000 /* fail if we can not lock map */

/* macros to extract info */
#define UVM_PROTECTION(X)	((X) & UVM_PROT_MASK)
#define UVM_INHERIT(X)		(((X) & UVM_INH_MASK) >> 4)
#define UVM_MAXPROTECTION(X)	(((X) >> 8) & UVM_PROT_MASK)
#define UVM_ADVICE(X)		(((X) >> 12) & UVM_ADV_MASK)

#define UVM_MAPFLAG(PROT,MAXPROT,INH,ADVICE,FLAGS) \
	((MAXPROT << 8)|(PROT)|(INH)|((ADVICE) << 12)|(FLAGS))

/* magic offset value */
#define UVM_UNKNOWN_OFFSET ((voff_t) -1)
				/* offset not known(obj) or don't care(!obj) */

/*
 * the following defines are for uvm_km_kmemalloc's flags
 */
#define UVM_KMF_NOWAIT	0x1			/* matches M_NOWAIT */
#define UVM_KMF_VALLOC	0x2			/* allocate VA only */
#define UVM_KMF_TRYLOCK	UVM_FLAG_TRYLOCK	/* try locking only */

/*
 * the following defines the strategies for uvm_pagealloc_strat()
 */
#define	UVM_PGA_STRAT_NORMAL	0	/* high -> low free list walk */
#define	UVM_PGA_STRAT_ONLY	1	/* only specified free list */
#define	UVM_PGA_STRAT_FALLBACK	2	/* ONLY falls back on NORMAL */

/*
 * flags for uvm_pagealloc_strat()
 */
#define UVM_PGA_USERESERVE	0x0001	/* ok to use reserve pages */
#define	UVM_PGA_ZERO		0x0002	/* returned page must be zero'd */

/*
 * the following defines are for ubc_alloc's flags
 */
#define UBC_READ	0
#define UBC_WRITE	1

/*
 * flags for uvn_findpages().
 */
#define UFP_ALL		0x0
#define UFP_NOWAIT	0x1
#define UFP_NOALLOC	0x2
#define UFP_NOCACHE	0x4
#define UFP_NORDONLY	0x8

/*
 * lockflags that control the locking behavior of various functions.
 */
#define	UVM_LK_ENTER	0x00000001	/* map locked on entry */
#define	UVM_LK_EXIT	0x00000002	/* leave map locked on exit */

/*
 * structures
 */

struct core;
struct mount;
struct pglist;
struct proc;
struct ucred;
struct uio;
struct uvm_object;
struct vm_anon;
struct vmspace;
struct pmap;
struct vnode;
struct pool;
struct simplelock;

extern struct pool *uvm_aiobuf_pool;

/*
 * uvmexp: global data structures that are exported to parts of the kernel
 * other than the vm system.
 */

struct uvmexp {
	/* vm_page constants */
	int pagesize;   /* size of a page (PAGE_SIZE): must be power of 2 */
	int pagemask;   /* page mask */
	int pageshift;  /* page shift */

	/* vm_page counters */
	int npages;     /* number of pages we manage */
	int free;       /* number of free pages */
	int active;     /* number of active pages */
	int inactive;   /* number of pages that we free'd but may want back */
	int paging;	/* number of pages in the process of being paged out */
	int wired;      /* number of wired pages */
	/* XXX: Adding anything before this line will break binary
	 *      compatibility with top(1) on NetBSD 1.5.
	 */
	int zeropages;		/* number of zero'd pages */
	int reserve_pagedaemon; /* number of pages reserved for pagedaemon */
	int reserve_kernel;	/* number of pages reserved for kernel */
	int anonpages;		/* number of pages used by anon pagers */
	int vnodepages;		/* number of pages used by vnode page cache */
	int vtextpages;		/* number of pages used by vtext vnodes */

	/* pageout params */
	int freemin;    /* min number of free pages */
	int freetarg;   /* target number of free pages */
	int inactarg;   /* target number of inactive pages */
	int wiredmax;   /* max number of wired pages */

	/* swap */
	int nswapdev;	/* number of configured swap devices in system */
	int swpages;	/* number of PAGE_SIZE'ed swap pages */
	int swpginuse;	/* number of swap pages in use */
	int swpgonly;	/* number of swap pages in use, not also in RAM */
	int nswget;	/* number of times fault calls uvm_swap_get() */
	int nanon;	/* number total of anon's in system */
	int nanonneeded;/* number of anons currently needed */
	int nfreeanon;	/* number of free anon's */

	/* stat counters */
	int faults;		/* page fault count */
	int traps;		/* trap count */
	int intrs;		/* interrupt count */
	int swtch;		/* context switch count */
	int softs;		/* software interrupt count */
	int syscalls;		/* system calls */
	int pageins;		/* pagein operation count */
				/* pageouts are in pdpageouts below */
	int swapins;		/* swapins */
	int swapouts;		/* swapouts */
	int pgswapin;		/* pages swapped in */
	int pgswapout;		/* pages swapped out */
	int forks;  		/* forks */
	int forks_ppwait;	/* forks where parent waits */
	int forks_sharevm;	/* forks where vmspace is shared */
	int pga_zerohit;	/* pagealloc where zero wanted and zero
				   was available */
	int pga_zeromiss;	/* pagealloc where zero wanted and zero
				   not available */
	int zeroaborts;		/* number of times page zeroing was
				   aborted */

	/* fault subcounters */
	int fltnoram;	/* number of times fault was out of ram */
	int fltnoanon;	/* number of times fault was out of anons */
	int fltpgwait;	/* number of times fault had to wait on a page */
	int fltpgrele;	/* number of times fault found a released page */
	int fltrelck;	/* number of times fault relock called */
	int fltrelckok;	/* number of times fault relock is a success */
	int fltanget;	/* number of times fault gets anon page */
	int fltanretry;	/* number of times fault retrys an anon get */
	int fltamcopy;	/* number of times fault clears "needs copy" */
	int fltnamap;	/* number of times fault maps a neighbor anon page */
	int fltnomap;	/* number of times fault maps a neighbor obj page */
	int fltlget;	/* number of times fault does a locked pgo_get */
	int fltget;	/* number of times fault does an unlocked get */
	int flt_anon;	/* number of times fault anon (case 1a) */
	int flt_acow;	/* number of times fault anon cow (case 1b) */
	int flt_obj;	/* number of times fault is on object page (2a) */
	int flt_prcopy;	/* number of times fault promotes with copy (2b) */
	int flt_przero;	/* number of times fault promotes with zerofill (2b) */

	/* daemon counters */
	int pdwoke;	/* number of times daemon woke up */
	int pdrevs;	/* number of times daemon rev'd clock hand */
	int pdswout;	/* number of times daemon called for swapout */
	int pdfreed;	/* number of pages daemon freed since boot */
	int pdscans;	/* number of pages daemon scaned since boot */
	int pdanscan;	/* number of anonymous pages scanned by daemon */
	int pdobscan;	/* number of object pages scanned by daemon */
	int pdreact;	/* number of pages daemon reactivated since boot */
	int pdbusy;	/* number of times daemon found a busy page */
	int pdpageouts;	/* number of times daemon started a pageout */
	int pdpending;	/* number of times daemon got a pending pagout */
	int pddeact;	/* number of pages daemon deactivates */

	/* kernel memory objects: managed by uvm_km_kmemalloc() only! */
	struct uvm_object *kmem_object;