103 lines
4.1 KiB
C
103 lines
4.1 KiB
C
/*
|
|
* Copyright (c) 1990 University of Utah.
|
|
* Copyright (c) 1991 The Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* the Systems Programming Group of the University of Utah Computer
|
|
* Science Department.
|
|
*
|
|
* 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.
|
|
*
|
|
* from: @(#)swap_pager.h 7.1 (Berkeley) 12/5/90
|
|
* $Id: swap_pager.h,v 1.5 1995/02/02 09:08:09 davidg Exp $
|
|
*/
|
|
|
|
/*
|
|
* Modifications to the block allocation data structure by John S. Dyson
|
|
* 18 Dec 93.
|
|
*/
|
|
|
|
#ifndef _SWAP_PAGER_
|
|
#define _SWAP_PAGER_ 1
|
|
|
|
/*
|
|
* SWB_NPAGES can be set to any value from 1 to 16 pages per allocation,
|
|
* however, due to the allocation spilling into non-swap pager backed memory,
|
|
* suggest keeping SWB_NPAGES small (1-4). If high performance is manditory
|
|
* perhaps up to 8 pages might be in order????
|
|
* Above problem has been fixed, now we support 16 pages per block. Unused
|
|
* space is recovered by the swap pager now...
|
|
*/
|
|
#define SWB_NPAGES 8
|
|
struct swblock {
|
|
unsigned short swb_valid; /* bitmask for valid pages */
|
|
unsigned short swb_locked; /* block locked */
|
|
int swb_block[SWB_NPAGES]; /* unfortunately int instead of daddr_t */
|
|
};
|
|
typedef struct swblock *sw_blk_t;
|
|
|
|
/*
|
|
* Swap pager private data.
|
|
*/
|
|
struct swpager {
|
|
vm_size_t sw_osize; /* size of object we are backing (bytes) */
|
|
int sw_nblocks; /* number of blocks in list (sw_blk_t units) */
|
|
int sw_allocsize; /* amount of space actually allocated */
|
|
sw_blk_t sw_blocks; /* pointer to list of swap blocks */
|
|
short sw_flags; /* flags */
|
|
short sw_poip; /* pageouts in progress */
|
|
short sw_piip; /* pageins in progress */
|
|
};
|
|
typedef struct swpager *sw_pager_t;
|
|
|
|
#define SW_WANTED 0x01
|
|
#define SW_NAMED 0x02
|
|
|
|
#ifdef KERNEL
|
|
|
|
void swap_pager_init(void);
|
|
vm_pager_t swap_pager_alloc(void *, vm_size_t, vm_prot_t, vm_offset_t);
|
|
void swap_pager_dealloc(vm_pager_t);
|
|
boolean_t swap_pager_getpage(vm_pager_t, vm_page_t, boolean_t);
|
|
boolean_t swap_pager_putpage(vm_pager_t, vm_page_t, boolean_t);
|
|
boolean_t swap_pager_getmulti(vm_pager_t, vm_page_t *, int, int, boolean_t);
|
|
boolean_t swap_pager_haspage(vm_pager_t, vm_offset_t);
|
|
int swap_pager_io(sw_pager_t, vm_page_t *, int, int, int);
|
|
void swap_pager_iodone(struct buf *);
|
|
boolean_t swap_pager_clean();
|
|
void swap_pager_copy __P((vm_pager_t, vm_offset_t, vm_pager_t, vm_offset_t, vm_offset_t));
|
|
void swap_pager_freespace __P((vm_pager_t, vm_offset_t, vm_offset_t));
|
|
|
|
extern struct pagerops swappagerops;
|
|
|
|
#endif
|
|
|
|
#endif /* _SWAP_PAGER_ */
|