/*      $NetBSD: uvm_swap.h,v 1.29 2024/03/15 22:15:21 andvar Exp $     */

/*
* Copyright (c) 1997 Matthew R. Green
* 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.
*
* 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_swap.h,v 1.1.2.6 1997/12/15 05:39:31 mrg Exp
*/

#ifndef _UVM_UVM_SWAP_H_
#define _UVM_UVM_SWAP_H_

#define SWSLOT_BAD      (-1)

#if defined(_KERNEL) || defined(_MODULE)
#if defined(_KERNEL_OPT)
#include "opt_vmswap.h"
#endif

struct lwp;
struct swapent;

#if defined(VMSWAP)

struct vm_page;

int     uvm_swap_get(struct vm_page *, int, int);
int     uvm_swap_put(int, struct vm_page **, int, int);
int     uvm_swap_alloc(int *, bool);
void    uvm_swap_free(int, int);
void    uvm_swap_markbad(int, int);
bool    uvm_swapisfull(void);
void    swapsys_lock(krw_t);
void    swapsys_unlock(void);
int     uvm_swap_stats(char *, int,
   void (*)(void *, const struct swapent *), size_t, register_t *);

#else /* defined(VMSWAP) */

#define uvm_swapisfull()        true

static inline int
uvm_swap_stats(char *c, int l, void (*f)(void *, const struct swapent *),
   size_t count, register_t *retval)
{

       *retval = 0;
       return ENOSYS;
}

#endif /* defined(VMSWAP) */

void    uvm_swap_shutdown(struct lwp *);

#endif /* _KERNEL || _MODULE */

#endif /* _UVM_UVM_SWAP_H_ */