/* 
 * Copyright (c) 1987 Carnegie-Mellon University
 * 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.
 *
 * 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.
 *
 *      @(#)pmap.h      7.6 (Berkeley) 5/10/91
 */

#ifndef _PMAP_MACHINE_
#define _PMAP_MACHINE_

#define HP_PAGE_SIZE    NBPG
#define HP_SEG_SIZE     NBSEG

/*
 * Pmap stuff
 */
struct pmap {
	struct pte              *pm_ptab;       /* KVA of page table */
	struct ste              *pm_stab;       /* KVA of segment table */
	int                     pm_stchanged;   /* ST changed */
	short                   pm_sref;        /* segment table ref count */
	short                   pm_count;       /* pmap reference count */
	simple_lock_data_t      pm_lock;        /* lock on pmap */
	struct pmap_statistics  pm_stats;       /* pmap statistics */
	long                    pm_ptpages;     /* more stats: PT pages */
};

typedef struct pmap     *pmap_t;

extern pmap_t           kernel_pmap;

/*
 * Macros for speed
 */
#define PMAP_ACTIVATE(pmapp, pcbp, iscurproc) \
	if ((pmapp) != NULL && (pmapp)->pm_stchanged) { \
		(pcbp)->pcb_ustp = \
		    hp300_btop(pmap_extract(kernel_pmap, (pmapp)->pm_stab)); \
		if (iscurproc) \
			loadustp((pcbp)->pcb_ustp); \
		(pmapp)->pm_stchanged = FALSE; \
	}
#define PMAP_DEACTIVATE(pmapp, pcbp)

/*
 * 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 {
	struct pv_entry *pv_next;       /* next pv_entry */
	struct pmap     *pv_pmap;       /* pmap where mapping lies */
	vm_offset_t     pv_va;          /* virtual address for mapping */
	struct ste      *pv_ptste;      /* non-zero if VA maps a PT page */
	struct pmap     *pv_ptpmap;     /* if pv_ptste, pmap for PT page */
	int             pv_flags;       /* flags */
} *pv_entry_t;

#define PV_CI           0x01    /* all entries must be cache inhibited */
#define PV_PTPAGE       0x02    /* entry maps a page table page */

#ifdef  _KERNEL
pv_entry_t      pv_table;               /* array of entries, one per page */

#define pa_index(pa)            atop(pa - vm_first_phys)
#define pa_to_pvh(pa)           (&pv_table[pa_index(pa)])

#define pmap_kernel()                   (kernel_pmap)
#define pmap_resident_count(pmap)       ((pmap)->pm_stats.resident_count)

extern  struct pte *Sysmap;
extern  char *vmmap;                    /* map for mem, dumps, etc. */
#endif  _KERNEL

#endif  _PMAP_MACHINE_