/*-
 * Copyright (c) 1991 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 and William Jolitz of UUNET Technologies Inc.
 *
 * 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.
 * 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.
 *
 * Derived from hp300 version by Mike Hibler, this version by William
 * Jolitz uses a recursive map [a pde points to the page directory] to
 * map the page tables using the pagetables themselves. This is done to
 * reduce the impact on kernel virtual memory for lots of sparse address
 * space, and to reduce the cost of memory to each process.
 *
 *	from: hp300: @(#)pmap.h	7.2 (Berkeley) 12/16/90
 *	from: @(#)pmap.h	7.4 (Berkeley) 5/12/91
 *	from: i386 pmap.h,v 1.54 1997/11/20 19:30:35 bde Exp
 * $FreeBSD: src/sys/ia64/include/pmap.h,v 1.26 2005/12/06 21:09:01 jhb Exp $
 */

#ifndef _MACHINE_PMAP_H_
#define	_MACHINE_PMAP_H_

#include <sys/queue.h>
#include <sys/_lock.h>
#include <sys/_mutex.h>
#include <machine/atomic.h>
#include <machine/pte.h>

#ifdef _KERNEL

#ifndef NKPT
#define	NKPT		30	/* initial number of kernel page tables */
#endif
#define MAXKPT		(PAGE_SIZE/sizeof(vm_offset_t))

#define	vtophys(va)	pmap_kextract((vm_offset_t)(va))

#endif /* _KERNEL */

/*
 * Pmap stuff
 */
struct	pv_entry;

struct md_page {
	int			pv_list_count;
	TAILQ_HEAD(,pv_entry)	pv_list;
};

struct pmap {
	struct mtx		pm_mtx;
	TAILQ_HEAD(,pv_entry)	pm_pvlist;	/* list of mappings in pmap */
	u_int32_t		pm_rid[5];	/* base RID for pmap */
	int			pm_active;	/* active flag */
	struct pmap_statistics	pm_stats;	/* pmap statistics */
};

typedef struct pmap	*pmap_t;

#ifdef _KERNEL
extern struct pmap	kernel_pmap_store;
#define kernel_pmap	(&kernel_pmap_store)

#define	PMAP_LOCK(pmap)		mtx_lock(&(pmap)->pm_mtx)
#define	PMAP_LOCK_ASSERT(pmap, type) \
				mtx_assert(&(pmap)->pm_mtx, (type))
#define	PMAP_LOCK_DESTROY(pmap)	mtx_destroy(&(pmap)->pm_mtx)
#define	PMAP_LOCK_INIT(pmap)	mtx_init(&(pmap)->pm_mtx, "pmap", \
				    NULL, MTX_DEF)
#define	PMAP_LOCKED(pmap)	mtx_owned(&(pmap)->pm_mtx)
#define	PMAP_MTX(pmap)		(&(pmap)->pm_mtx)
#define	PMAP_TRYLOCK(pmap)	mtx_trylock(&(pmap)->pm_mtx)
#define	PMAP_UNLOCK(pmap)	mtx_unlock(&(pmap)->pm_mtx)
#endif

/*
 * For each vm_page_t, there is a list of all currently valid virtual
 * mappings of that page.  An entry is a pv_entry_t, the list is pv_table.
 */
typedef struct pv_entry {
	pmap_t		pv_pmap;	/* pmap where mapping lies */
	vm_offset_t	pv_va;		/* virtual address for mapping */
	TAILQ_ENTRY(pv_entry)	pv_list;
	TAILQ_ENTRY(pv_entry)	pv_plist;
} *pv_entry_t;

#ifdef	_KERNEL

extern vm_offset_t phys_avail[];
extern vm_offset_t virtual_avail;
extern vm_offset_t virtual_end;

extern uint64_t pmap_vhpt_base[];
extern int pmap_vhpt_log2size;

#define	pmap_page_is_mapped(m)	(!TAILQ_EMPTY(&(m)->md.pv_list))

vm_offset_t pmap_steal_memory(vm_size_t);
void	pmap_bootstrap(void);
void	pmap_kenter(vm_offset_t va, vm_offset_t pa);
vm_paddr_t pmap_kextract(vm_offset_t va);
void	pmap_kremove(vm_offset_t);
void	pmap_setdevram(unsigned long long basea, vm_offset_t sizea);
int	pmap_uses_prom_console(void);
void	*pmap_mapdev(vm_offset_t, vm_size_t);
void	pmap_unmapdev(vm_offset_t, vm_size_t);
unsigned *pmap_pte(pmap_t, vm_offset_t) __pure2;
void	pmap_set_opt	(unsigned *);
void	pmap_set_opt_bsp	(void);
struct pmap *pmap_switch(struct pmap *pmap);

#endif /* _KERNEL */

#endif /* !_MACHINE_PMAP_H_ */
