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pmap.h revision 1.24 
      1 /*      $NetBSD: pmap.h,v 1.24 1998/01/18 22:07:50 ragge Exp $     */
      2 
      3 /*
      4  * Copyright (c) 1987 Carnegie-Mellon University
      5  * Copyright (c) 1991 Regents of the University of California.
      6  * All rights reserved.
      7  *
      8  * Changed for the VAX port. /IC
      9  *
     10  * This code is derived from software contributed to Berkeley by
     11  * the Systems Programming Group of the University of Utah Computer
     12  * Science Department.
     13  *
     14  * Redistribution and use in source and binary forms, with or without
     15  * modification, are permitted provided that the following conditions
     16  * are met:
     17  * 1. Redistributions of source code must retain the above copyright
     18  *    notice, this list of conditions and the following disclaimer.
     19  * 2. Redistributions in binary form must reproduce the above copyright
     20  *    notice, this list of conditions and the following disclaimer in the
     21  *    documentation and/or other materials provided with the distribution.
     22  * 3. All advertising materials mentioning features or use of this software
     23  *    must display the following acknowledgement:
     24  *	This product includes software developed by the University of
     25  *	California, Berkeley and its contributors.
     26  * 4. Neither the name of the University nor the names of its contributors
     27  *    may be used to endorse or promote products derived from this software
     28  *    without specific prior written permission.
     29  *
     30  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     31  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     32  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     33  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     34  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     35  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     36  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     37  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     38  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     39  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     40  * SUCH DAMAGE.
     41  *
     42  *	@(#)pmap.h	7.6 (Berkeley) 5/10/91
     43  */
     44 
     45 
     46 #ifndef	PMAP_H
     47 #define	PMAP_H
     48 
     49 #include <machine/mtpr.h>
     50 
     51 struct pte;
     52 
     53 /*
     54  * Pmap structure
     55  *  pm_stack holds lowest allocated memory for the process stack.
     56  */
     57 
     58 typedef struct pmap {
     59 	vm_offset_t		 pm_stack; /* Base of alloced p1 pte space */
     60 	int                      ref_count;   /* reference count        */
     61 	struct pte		*pm_p0br; /* page 0 base register */
     62 	long			 pm_p0lr; /* page 0 length register */
     63 	struct pte		*pm_p1br; /* page 1 base register */
     64 	long			 pm_p1lr; /* page 1 length register */
     65 } *pmap_t;
     66 
     67 /*
     68  * For each vm_page_t, there is a list of all currently valid virtual
     69  * mappings of that page.  An entry is a pv_entry_t, the list is pv_table.
     70  */
     71 
     72 typedef struct pv_entry {
     73 	struct pv_entry	*pv_next;	/* next pv_entry */
     74 	struct pte	*pv_pte;	/* pte for this physical page */
     75 } *pv_entry_t;
     76 
     77 /* ROUND_PAGE used before vm system is initialized */
     78 #define ROUND_PAGE(x)   (((uint)(x) + CLOFSET)& ~CLOFSET)
     79 #define	TRUNC_PAGE(x)	((uint)(x) & ~CLOFSET)
     80 
     81 /* Mapping macros used when allocating SPT */
     82 #define	MAPVIRT(ptr, count)					\
     83 	(vm_offset_t)ptr = virtual_avail;			\
     84 	virtual_avail += (count) * NBPG;
     85 
     86 #define	MAPPHYS(ptr, count, perm)				\
     87 	(vm_offset_t)ptr = avail_start + KERNBASE;		\
     88 	avail_start += (count) * NBPG;
     89 
     90 #ifdef	_KERNEL
     91 
     92 extern	struct pmap kernel_pmap_store;
     93 
     94 #define	pmap_kernel()			(&kernel_pmap_store)
     95 
     96 #endif	/* _KERNEL */
     97 
     98 /* Routines that are best to define as macros */
     99 #define	pmap_copy(a,b,c,d,e) 		/* Dont do anything */
    100 #define	pmap_update()	mtpr(0,PR_TBIA)	/* Update buffes */
    101 #define	pmap_pageable(a,b,c,d)		/* Dont do anything */
    102 #define	pmap_collect(pmap)		/* No need so far */
    103 #define	pmap_reference(pmap)	if(pmap) (pmap)->ref_count++
    104 #define	pmap_phys_address(phys) ((u_int)(phys)<<PAGE_SHIFT)
    105 #define	pmap_is_referenced(phys)	(FALSE)
    106 #define	pmap_clear_reference(pa)	pmap_page_protect(pa, VM_PROT_NONE)
    107 #define pmap_change_wiring(pmap, v, w)  /* no need */
    108 #define	pmap_remove(pmap, start, slut)  pmap_protect(pmap, start, slut, 0)
    109 
    110 /* These can be done as efficient inline macros */
    111 #define pmap_copy_page(src, dst)				\
    112 	__asm__("addl3 $0x80000000,%0,r0;addl3 $0x80000000,%1,r1;	\
    113 	    movc3 $1024,(r0),(r1)"				\
    114 	    :: "r"(src),"r"(dst):"r0","r1","r2","r3","r4","r5");
    115 
    116 #define pmap_zero_page(phys)					\
    117 	__asm__("addl3 $0x80000000,%0,r0;movc5 $0,(r0),$0,$1024,(r0)" \
    118 	    :: "r"(phys): "r0","r1","r2","r3","r4","r5");
    119 
    120 /* Prototypes */
    121 void	pmap_bootstrap __P((void));
    122 void	pmap_pinit __P((pmap_t));
    123 
    124 #endif PMAP_H
    125