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      1 /*	$NetBSD: pte.h,v 1.24 2017/05/22 17:12:11 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  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #ifndef _VAX_PTE_H_
     29 #define _VAX_PTE_H_
     30 
     31 #ifndef _LOCORE
     32 /*
     33  * VAX page table entries
     34  */
     35 struct pte {
     36 	unsigned int	pg_pfn:21;	/* Page Frame Number or 0 */
     37 	unsigned int	pg_illegal:2;	/* Don't use this bits */
     38 	unsigned int	pg_sref:1;	/* Help for ref simulation */
     39 	unsigned int	pg_w:1;		/* Wired bit */
     40 	unsigned int	pg_z:1;		/* Zero DIGITAL = 0 */
     41 	unsigned int	pg_m:1;		/* Modify DIGITAL */
     42 	unsigned int	pg_prot:4;	/* reserved at zero */
     43 	unsigned int	pg_v:1;		/* valid bit */
     44 };
     45 
     46 
     47 typedef struct pte	pt_entry_t;	/* Mach page table entry */
     48 
     49 #endif /* _LOCORE */
     50 
     51 #define PG_V		0x80000000
     52 #define PG_NV		0x00000000
     53 #define PG_PROT		0x78000000
     54 #define PG_RW		0x20000000
     55 #define PG_KW		0x10000000
     56 #define PG_KR		0x18000000
     57 #define PG_URKW		0x70000000
     58 #define PG_RO		0x78000000
     59 #define PG_NONE		0x00000000
     60 #define PG_M		0x04000000
     61 #define PG_W		0x01000000
     62 #define PG_SREF		0x00800000
     63 #define PG_ILLEGAL	0x00600000
     64 #define PG_FRAME	0x001fffff
     65 #define PG_PFNUM(x)	(((unsigned long)(x) & 0x3ffffe00) >> VAX_PGSHIFT)
     66 
     67 #ifndef _LOCORE
     68 extern pt_entry_t *Sysmap;
     69 /*
     70  * Kernel virtual address to page table entry and to physical address.
     71  */
     72 #endif
     73 
     74 #ifdef __GNUC__
     75 #define	kvtopte(va)	kvtopte0((vaddr_t) (va))
     76 static inline struct pte *
     77 kvtopte0(vaddr_t va)
     78 {
     79 	struct pte *pt;
     80 #ifdef _RUMPKERNEL
     81 	__asm(
     82 		"extzv $9,$21,%1,%0\n\t"
     83 		"moval %2[%0],%0\n\t"
     84 	     : "=r"(pt)
     85 	     : "g"(va), "o"(*Sysmap));
     86 #else
     87 	__asm(
     88 		"extzv $9,$21,%1,%0\n\t"
     89 		"moval *Sysmap[%0],%0\n\t"
     90 	     : "=r"(pt)
     91 	     : "g"(va));
     92 #endif
     93 	return pt;
     94 }
     95 
     96 #define	kvtophys(va)	kvtophys0((vaddr_t) (va))
     97 static inline paddr_t
     98 kvtophys0(vaddr_t va)
     99 {
    100 	paddr_t pa;
    101 #ifdef _RUMPKERNEL
    102 	__asm(
    103 		"extzv $9,$21,%1,%0\n\t"
    104 		"ashl $9,%2[%0],%0\n\t"
    105 		"insv %1,$0,$9,%0\n\t"
    106 	    : "=&r"(pa)
    107 	    : "g"(va), "o"(*Sysmap) : "cc");
    108 #else
    109 	__asm(
    110 		"extzv $9,$21,%1,%0\n\t"
    111 		"ashl $9,*Sysmap[%0],%0\n\t"
    112 		"insv %1,$0,$9,%0\n\t"
    113 	    : "=&r"(pa)
    114 	    : "g"(va) : "cc");
    115 #endif
    116 	return pa;
    117 }
    118 #else /* __GNUC__ */
    119 #define kvtophys(va) \
    120 	(((kvtopte(va))->pg_pfn << VAX_PGSHIFT) | ((paddr_t)(va) & VAX_PGOFSET))
    121 #define kvtopte(va) (&Sysmap[PG_PFNUM(va)])
    122 #endif /* __GNUC__ */
    123 #define uvtopte(va, pcb) \
    124 	(((vaddr_t)va < 0x40000000) ? \
    125 	&(((pcb)->P0BR)[PG_PFNUM(va)]) : \
    126 	&(((pcb)->P1BR)[PG_PFNUM(va)]))
    127 
    128 #endif
    129