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pte.h revision 1.3 
      1 /*      $NetBSD: pte.h,v 1.3 1994/11/25 19:08:59 ragge Exp $      */
      2 
      3 /*
      4  * Copyright (c) 1994 Ludd, University of Lule}, Sweden.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *     This product includes software developed at Ludd, University of Lule}.
     18  * 4. The name of the author may not be used to endorse or promote products
     19  *    derived from this software without specific prior written permission
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33  /* All bugs are subject to removal without further notice */
     34 
     35 
     36 #include "vax/include/param.h"
     37 
     38 #ifndef ASSEMBLER
     39 
     40 /*
     41  * VAX page table entries
     42  */
     43 
     44 struct pte {
     45   unsigned int	pg_pfn:21;	/* Page Frame Number or 0 */
     46   unsigned int	pg_u:1;         /* Uniform bit, does WHAT?? XXX */
     47   unsigned int	pg_w:1;         /* Wired bit */
     48   unsigned int	pg_sref:1;	/* Help for ref simulation */
     49   unsigned int	pg_ref:1;	/* Simulated reference bit */
     50   unsigned int	pg_z:1;		/* Zero DIGITAL = 0 */
     51   unsigned int	pg_m:1;	        /* Modify DIGITAL */
     52   unsigned int	pg_prot:4;     	/* reserved at zero */
     53   unsigned int	pg_v:1;		/* valid bit */
     54 };
     55 
     56 
     57 typedef struct pte	pt_entry_t;	/* Mach page table entry */
     58 
     59 #endif ASSEMBLER
     60 
     61 #define	PT_ENTRY_NULL	((pt_entry_t *) 0)
     62 
     63 #define PG_V            0x80000000
     64 #define PG_NV           0x00000000
     65 #define PG_PROT         0x78000000
     66 #define PG_RW           0x20000000
     67 #define PG_KW           0x10000000
     68 #define PG_RO           0x78000000
     69 #define PG_NONE         0x00000000
     70 #define PG_M            0x04000000
     71 #define PG_REF          0x01000000
     72 #define PG_SREF         0x00800000
     73 #define PG_W            0x00400000
     74 #define PG_U            0x00200000
     75 #define PG_FRAME        0x001fffff
     76 #define PG_SHIFT        9
     77 #define	PG_PFNUM(x)	((x) >> PG_SHIFT)
     78 
     79 
     80 #define VAX_MAX_KPTSIZE VM_KERNEL_PT_PAGES
     81 
     82 #ifndef ASSEMBLER
     83 extern struct pte *Sysmap;
     84 /*
     85  * Kernel virtual address to page table entry and to physical address.
     86  */
     87 #endif
     88 
     89 #define	kvtopte(va) \
     90 	(&Sysmap[((unsigned)(va) - KERNBASE) >> PGSHIFT])
     91 #define	ptetokv(pt) \
     92 	((((pt_entry_t *)(pt) - Sysmap) << PGSHIFT) + 0x80000000)
     93 #define	kvtophys(va) \
     94 	((kvtopte(va)->pg_pfnum << PGSHIFT) | ((int)(va) & PGOFSET))
     95