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pte.h revision 1.5 
      1 /*	$NetBSD: pte.h,v 1.5 2002/02/11 18:06:06 uch Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1990 The Regents of the University of California.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * William Jolitz.
      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  *	@(#)pte.h	5.5 (Berkeley) 5/9/91
     39  */
     40 
     41 /*
     42  * SH3
     43  *
     44  * Page Table Entry
     45  *
     46  *  T.Horiuchi Brains Corp. 05/26/1998
     47  */
     48 #ifndef _SH3_PTE_H_
     49 #define _SH3_PTE_H_
     50 
     51 #define	PDSHIFT		22		/* LOG2(NBPDR) */
     52 #define	NBPD		(1 << PDSHIFT)	/* bytes/page dir */
     53 #define	PDOFSET		(NBPD-1)	/* byte offset into page dir */
     54 #define	NPTEPD		(NBPD / NBPG)
     55 
     56 #ifndef _LOCORE
     57 typedef int	pd_entry_t;		/* page directory entry */
     58 typedef int	pt_entry_t;		/* Mach page table entry */
     59 #endif
     60 
     61 #define	PD_MASK		0xffc00000	/* page directory address bits */
     62 #define	PT_MASK		0x003ff000	/* page table address bits */
     63 #define	PTES_PER_PTP	(NBPD / NBPG)	/* # of PTEs in a PTP */
     64 
     65 /*
     66  *
     67  * NetBSD/sh3 PTE format.
     68  *
     69  * SH3
     70  *   PPN   V   PR  SZ C  D  SH
     71  * [28:10][8][6:5][4][3][2][1]
     72  *
     73  * SH4
     74  *         V  SZ  PR  SZ C  D  SH WT
     75  * [28:10][8][7][6:5][4][3][2][1][0]
     76  *
     77  * + NetBSD/sh3 page size is 4KB. [11:10] and [7] can be used as SW bit.
     78  * + [31:29] should be available for SW bit...
     79  * + SH4 WT bit is not stored in PTE. U0 is always write-back. and
     80  *   P3 is always write-thurogh. (see sh3/trap.c::__setup_pte_sh4())
     81  *   We use WT bit as SW bit.
     82  *
     83  * Software bit assign
     84  *   [11:9] - SH4 PCMCIA Assistant bit. (space attribute bit only)
     85  *   [7]    - Wired page bit.
     86  *   [0]    - PVlist bit.
     87  */
     88 
     89 /*
     90  * Hardware bits
     91  */
     92 #define	PG_FRAME		0xfffff000	/* page frame mask XXX */
     93 #define	PG_V			0x00000100	/* present */
     94 #define	PG_UW			0x00000060	/* kernel/user read/write */
     95 #define	PG_URKR			0x00000040	/* kernel/user read only */
     96 #define	PG_KW			0x00000020	/* kernel read/write */
     97 #define	PG_KR			0x00000000	/* kernel read only */
     98 #define	PG_4K			0x00000010	/* page size 4KB */
     99 #define	PG_N			0x00000008	/* 0=non-cacheable */
    100 #define	PG_M			0x00000004	/* has been modified */
    101 #define	PG_G			0x00000002	/* share status */
    102 #define	PG_WT			0x00000001	/* write through (SH4) */
    103 
    104 #define PG_HW_BITS		0x1ffff17e	/* [28:12][8][6:1] */
    105 
    106 /*
    107  * Software bits
    108  */
    109 #define	PG_W			0x00000080	/* page is wired */
    110 #define	PG_PVLIST		0x00000001	/* mapping has entry on pvlist */
    111 /* SH4 PCMCIA MMU support bits */
    112 /* PTEA SA (Space Attribute bit) */
    113 #define _PG_PCMCIA		0x00000e00
    114 #define _PG_PCMCIA_SHIFT	9
    115 #define _PG_PCMCIA_NONE		0x00000000	/* Non PCMCIA space */
    116 #define _PG_PCMCIA_IO		0x00000200	/* IOIS16 signal */
    117 #define _PG_PCMCIA_IO8		0x00000400	/* 8 bit I/O  */
    118 #define _PG_PCMCIA_IO16		0x00000600	/* 16 bit I/O  */
    119 #define _PG_PCMCIA_MEM8		0x00000800	/* 8 bit common memory */
    120 #define _PG_PCMCIA_MEM16	0x00000a00	/* 16 bit common memory */
    121 #define _PG_PCMCIA_ATTR8	0x00000c00	/* 8 bit attribute */
    122 #define _PG_PCMCIA_ATTR16	0x00000e00	/* 16 bit attribute */
    123 
    124 #endif /* !_SH3_PTE_H_ */
    125