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mips3_pte.h revision 1.4 
      1 /*	$NetBSD: mips3_pte.h,v 1.4 1996/10/13 09:28:55 jonathan Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1988 University of Utah.
      5  * Copyright (c) 1992, 1993
      6  *	The Regents of the University of California.  All rights reserved.
      7  *
      8  * This code is derived from software contributed to Berkeley by
      9  * the Systems Programming Group of the University of Utah Computer
     10  * Science Department and Ralph Campbell.
     11  *
     12  * Redistribution and use in source and binary forms, with or without
     13  * modification, are permitted provided that the following conditions
     14  * are met:
     15  * 1. Redistributions of source code must retain the above copyright
     16  *    notice, this list of conditions and the following disclaimer.
     17  * 2. Redistributions in binary form must reproduce the above copyright
     18  *    notice, this list of conditions and the following disclaimer in the
     19  *    documentation and/or other materials provided with the distribution.
     20  * 3. All advertising materials mentioning features or use of this software
     21  *    must display the following acknowledgement:
     22  *	This product includes software developed by the University of
     23  *	California, Berkeley and its contributors.
     24  * 4. Neither the name of the University nor the names of its contributors
     25  *    may be used to endorse or promote products derived from this software
     26  *    without specific prior written permission.
     27  *
     28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     38  * SUCH DAMAGE.
     39  *
     40  * from: Utah Hdr: pte.h 1.11 89/09/03
     41  *
     42  *	from: @(#)pte.h	8.1 (Berkeley) 6/10/93
     43  */
     44 
     45 /*
     46  * R4000 hardware page table entry
     47  */
     48 
     49 #ifndef _LOCORE
     50 struct pte {
     51 #if BYTE_ORDER == BIG_ENDIAN
     52 unsigned int	pg_prot:2,		/* SW: access control */
     53 		pg_pfnum:24,		/* HW: core page frame number or 0 */
     54 		pg_attr:3,		/* HW: cache attribute */
     55 		pg_m:1,			/* HW: modified (dirty) bit */
     56 		pg_v:1,			/* HW: valid bit */
     57 		pg_g:1;			/* HW: ignore pid bit */
     58 #endif
     59 #if BYTE_ORDER == LITTLE_ENDIAN
     60 unsigned int 	pg_g:1,			/* HW: ignore pid bit */
     61 		pg_v:1,			/* HW: valid bit */
     62 		pg_m:1,			/* HW: modified (dirty) bit */
     63 		pg_attr:3,			/* HW: cache attribute */
     64 		pg_pfnum:24,		/* HW: core page frame number or 0 */
     65 		pg_prot:2;		/* SW: access control */
     66 #endif
     67 };
     68 
     69 /*
     70  * Structure defining an tlb entry data set.
     71  */
     72 
     73 struct tlb {
     74 	int	tlb_mask;
     75 	int	tlb_hi;
     76 	int	tlb_lo0;
     77 	int	tlb_lo1;
     78 };
     79 
     80 typedef union pt_entry {
     81 	unsigned int	pt_entry;	/* for copying, etc. */
     82 	struct pte	pt_pte;		/* for getting to bits by name */
     83 } pt_entry_t;	/* Mach page table entry */
     84 #endif /* _LOCORE */
     85 
     86 #define	PT_ENTRY_NULL	((pt_entry_t *) 0)
     87 
     88 #define PG_WIRED	0x80000000	/* SW */
     89 #define PG_RO		0x40000000	/* SW */
     90 
     91 #define	PG_SVPN		0xfffff000	/* Software page no mask */
     92 #define	PG_HVPN		0xffffe000	/* Hardware page no mask */
     93 #define	PG_ODDPG	0x00001000	/* Odd even pte entry */
     94 #define	PG_ASID		0x000000ff	/* Address space ID */
     95 #define	PG_G		0x00000001	/* HW */
     96 #define	PG_V		0x00000002
     97 #define	PG_NV		0x00000000
     98 #define	PG_M		0x00000004
     99 #define	PG_ATTR		0x0000003f
    100 #define	PG_UNCACHED	0x00000010
    101 #define	PG_CACHED	0x00000018
    102 #define	PG_CACHEMODE	0x00000038
    103 #define	PG_ROPAGE	(PG_V | PG_RO | PG_CACHED) /* Write protected */
    104 #define	PG_RWPAGE	(PG_V | PG_M | PG_CACHED)  /* Not wr-prot not clean */
    105 #define	PG_CWPAGE	(PG_V | PG_CACHED)	   /* Not wr-prot but clean */
    106 #define	PG_IOPAGE	(PG_G | PG_V | PG_M | PG_UNCACHED)
    107 #define	PG_FRAME	0x3fffffc0
    108 #define PG_SHIFT	6
    109 
    110 /* pte accessor macros */
    111 
    112 #define vad_to_pfn(x) (((unsigned)(x) >> PG_SHIFT) & PG_FRAME)
    113 #define pfn_to_vad(x) (((x) & PG_FRAME) << PG_SHIFT)
    114 #define vad_to_vpn(x) ((unsigned)(x) & PG_SVPN)
    115 #define vpn_to_vad(x) ((x) & PG_SVPN)
    116 
    117 #define PTE_TO_PADDR(x) (pfn_to_vad((x))
    118 
    119 /* User virtual to pte page entry */
    120 #define uvtopte(adr) (((adr) >> PGSHIFT) & (NPTEPG -1))
    121 
    122 #define	PG_SIZE_4K	0x00000000
    123 #define	PG_SIZE_16K	0x00006000
    124 #define	PG_SIZE_64K	0x0001e000
    125 #define	PG_SIZE_256K	0x0007e000
    126 #define	PG_SIZE_1M	0x001fe000
    127 #define	PG_SIZE_4M	0x007fe000
    128 #define	PG_SIZE_16M	0x01ffe000
    129 
    130