/*	$OpenBSD: uvm_km.h,v 1.13 2014/07/11 16:35:40 jsg Exp $	*/
/*	$NetBSD: uvm_km.h,v 1.9 1999/06/21 17:25:11 thorpej 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.
 *
 * 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_km.h,v 1.1.2.2 1997/12/30 12:03:15 mrg Exp
 */

#ifndef _UVM_UVM_KM_H_
#define _UVM_UVM_KM_H_

/*
 * uvm_km.h
 */

#ifdef _KERNEL

#include <sys/mutex.h>

/*
 * prototypes
 */

void uvm_km_init(vaddr_t, vaddr_t);
void uvm_km_page_init(void);
void uvm_km_pgremove(struct uvm_object *, vaddr_t, vaddr_t);
void uvm_km_pgremove_intrsafe(vaddr_t, vaddr_t);

#if !defined(__HAVE_PMAP_DIRECT)

#define UVM_KM_PAGES_LOWAT_MAX	(2048)
#define UVM_KM_PAGES_HIWAT_MAX	(4 * UVM_KM_PAGES_LOWAT_MAX)

struct uvm_km_free_page {
	struct uvm_km_free_page *next;
};
struct uvm_km_pages {
	struct	mutex mtx;

	/* Low and high water mark for addresses. */
	int	lowat;
	int	hiwat;

	/* Kernel address pool. */
	int	free;
	vaddr_t	page[UVM_KM_PAGES_HIWAT_MAX];

	struct uvm_km_free_page *freelist;
	int freelistlen;

	struct	proc *km_proc;
};

extern struct uvm_km_pages uvm_km_pages;
#endif	/* _HAVE_PMAP_DIRECT */

#endif /* _KERNEL */

#endif /* _UVM_UVM_KM_H_ */