Home | History | Annotate | Line # | Download | only in uvm 
      1 /*	$NetBSD: uvm_swap.h,v 1.29 2024/03/15 22:15:21 andvar Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1997 Matthew R. Green
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  *
     28  * from: Id: uvm_swap.h,v 1.1.2.6 1997/12/15 05:39:31 mrg Exp
     29  */
     30 
     31 #ifndef _UVM_UVM_SWAP_H_
     32 #define _UVM_UVM_SWAP_H_
     33 
     34 #define	SWSLOT_BAD	(-1)
     35 
     36 #if defined(_KERNEL) || defined(_MODULE)
     37 #if defined(_KERNEL_OPT)
     38 #include "opt_vmswap.h"
     39 #endif
     40 
     41 struct lwp;
     42 struct swapent;
     43 
     44 #if defined(VMSWAP)
     45 
     46 struct vm_page;
     47 
     48 int	uvm_swap_get(struct vm_page *, int, int);
     49 int	uvm_swap_put(int, struct vm_page **, int, int);
     50 int	uvm_swap_alloc(int *, bool);
     51 void	uvm_swap_free(int, int);
     52 void	uvm_swap_markbad(int, int);
     53 bool	uvm_swapisfull(void);
     54 void	swapsys_lock(krw_t);
     55 void	swapsys_unlock(void);
     56 int	uvm_swap_stats(char *, int,
     57     void (*)(void *, const struct swapent *), size_t, register_t *);
     58 
     59 #else /* defined(VMSWAP) */
     60 
     61 #define	uvm_swapisfull()	true
     62 
     63 static inline int
     64 uvm_swap_stats(char *c, int l, void (*f)(void *, const struct swapent *),
     65     size_t count, register_t *retval)
     66 {
     67 
     68 	*retval = 0;
     69 	return ENOSYS;
     70 }
     71 
     72 #endif /* defined(VMSWAP) */
     73 
     74 void	uvm_swap_shutdown(struct lwp *);
     75 
     76 #endif /* _KERNEL || _MODULE */
     77 
     78 #endif /* _UVM_UVM_SWAP_H_ */
     79