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pmap.h revision 1.1 
      1 /*
      2  * Copyright (c) 1987 Carnegie-Mellon University
      3  * Copyright (c) 1991 Regents of the University of California.
      4  * All rights reserved.
      5  *
      6  * This code is derived from software contributed to Berkeley by
      7  * the Systems Programming Group of the University of Utah Computer
      8  * Science Department.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  *
     38  *	@(#)pmap.h	7.6 (Berkeley) 5/10/91
     39  */
     40 
     41 #ifndef	_PMAP_MACHINE_
     42 #define	_PMAP_MACHINE_
     43 
     44 #define HP_PAGE_SIZE	NBPG
     45 #define HP_SEG_SIZE	NBSEG
     46 
     47 /*
     48  * Pmap stuff
     49  */
     50 struct pmap {
     51 	struct pte		*pm_ptab;	/* KVA of page table */
     52 	struct ste		*pm_stab;	/* KVA of segment table */
     53 	int			pm_stchanged;	/* ST changed */
     54 	short			pm_sref;	/* segment table ref count */
     55 	short			pm_count;	/* pmap reference count */
     56 	simple_lock_data_t	pm_lock;	/* lock on pmap */
     57 	struct pmap_statistics	pm_stats;	/* pmap statistics */
     58 	long			pm_ptpages;	/* more stats: PT pages */
     59 };
     60 
     61 typedef struct pmap	*pmap_t;
     62 
     63 extern pmap_t		kernel_pmap;
     64 
     65 /*
     66  * Macros for speed
     67  */
     68 #define PMAP_ACTIVATE(pmapp, pcbp, iscurproc) \
     69 	if ((pmapp) != NULL && (pmapp)->pm_stchanged) { \
     70 		(pcbp)->pcb_ustp = \
     71 		    hp300_btop(pmap_extract(kernel_pmap, (pmapp)->pm_stab)); \
     72 		if (iscurproc) \
     73 			loadustp((pcbp)->pcb_ustp); \
     74 		(pmapp)->pm_stchanged = FALSE; \
     75 	}
     76 #define PMAP_DEACTIVATE(pmapp, pcbp)
     77 
     78 /*
     79  * For each vm_page_t, there is a list of all currently valid virtual
     80  * mappings of that page.  An entry is a pv_entry_t, the list is pv_table.
     81  */
     82 typedef struct pv_entry {
     83 	struct pv_entry	*pv_next;	/* next pv_entry */
     84 	struct pmap	*pv_pmap;	/* pmap where mapping lies */
     85 	vm_offset_t	pv_va;		/* virtual address for mapping */
     86 	struct ste	*pv_ptste;	/* non-zero if VA maps a PT page */
     87 	struct pmap	*pv_ptpmap;	/* if pv_ptste, pmap for PT page */
     88 	int		pv_flags;	/* flags */
     89 } *pv_entry_t;
     90 
     91 #define	PV_CI		0x01	/* all entries must be cache inhibited */
     92 #define PV_PTPAGE	0x02	/* entry maps a page table page */
     93 
     94 #ifdef	KERNEL
     95 pv_entry_t	pv_table;		/* array of entries, one per page */
     96 
     97 #define pa_index(pa)		atop(pa - vm_first_phys)
     98 #define pa_to_pvh(pa)		(&pv_table[pa_index(pa)])
     99 
    100 #define	pmap_kernel()			(kernel_pmap)
    101 #define	pmap_resident_count(pmap)	((pmap)->pm_stats.resident_count)
    102 
    103 extern	struct pte *Sysmap;
    104 extern	char *vmmap;			/* map for mem, dumps, etc. */
    105 #endif	KERNEL
    106 
    107 #endif	_PMAP_MACHINE_
    108