Return to pte.h CVS log

Up to [Net/2] / Net2 / arch / i386 / include

Annotation of Net2/arch/i386/include/pte.h, revision 1.1

1.1     ! root        1: /*-
        !             2:  * Copyright (c) 1990 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * This code is derived from software contributed to Berkeley by
        !             6:  * William Jolitz.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms, with or without
        !             9:  * modification, are permitted provided that the following conditions
        !            10:  * are met:
        !            11:  * 1. Redistributions of source code must retain the above copyright
        !            12:  *    notice, this list of conditions and the following disclaimer.
        !            13:  * 2. Redistributions in binary form must reproduce the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer in the
        !            15:  *    documentation and/or other materials provided with the distribution.
        !            16:  * 3. All advertising materials mentioning features or use of this software
        !            17:  *    must display the following acknowledgement:
        !            18:  *     This product includes software developed by the University of
        !            19:  *     California, Berkeley and its contributors.
        !            20:  * 4. Neither the name of the University nor the names of its contributors
        !            21:  *    may be used to endorse or promote products derived from this software
        !            22:  *    without specific prior written permission.
        !            23:  *
        !            24:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            25:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            26:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            27:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            28:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            29:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            30:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            31:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            32:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            33:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            34:  * SUCH DAMAGE.
        !            35:  *
        !            36:  *     @(#)pte.h       5.5 (Berkeley) 5/9/91
        !            37:  */
        !            38: 
        !            39: /*
        !            40:  * 386 page table entry and page table directory
        !            41:  * W.Jolitz, 8/89
        !            42:  *
        !            43:  * There are two major kinds of pte's: those which have ever existed (and are
        !            44:  * thus either now in core or on the swap device), and those which have
        !            45:  * never existed, but which will be filled on demand at first reference.
        !            46:  * There is a structure describing each.  There is also an ancillary
        !            47:  * structure used in page clustering.
        !            48:  */
        !            49: 
        !            50: #ifndef LOCORE
        !            51: struct pde
        !            52: {
        !            53: unsigned int   
        !            54:                pd_v:1,                 /* valid bit */
        !            55:                pd_prot:2,              /* access control */
        !            56:                pd_mbz1:2,              /* reserved, must be zero */
        !            57:                pd_u:1,                 /* hardware maintained 'used' bit */
        !            58:                :1,                     /* not used */
        !            59:                pd_mbz2:2,              /* reserved, must be zero */
        !            60:                :3,                     /* reserved for software */
        !            61:                pd_pfnum:20;            /* physical page frame number of pte's*/
        !            62: };
        !            63: struct pte
        !            64: {
        !            65: unsigned int   
        !            66:                pg_v:1,                 /* valid bit */
        !            67:                pg_prot:2,              /* access control */
        !            68:                pg_mbz1:2,              /* reserved, must be zero */
        !            69:                pg_u:1,                 /* hardware maintained 'used' bit */
        !            70:                pg_m:1,                 /* hardware maintained modified bit */
        !            71:                pg_mbz2:2,              /* reserved, must be zero */
        !            72:                pg_fod:1,               /* is fill on demand (=0) */
        !            73:                :1,                     /* must write back to swap (unused) */
        !            74:                pg_nc:1,                /* 'uncacheable page' bit */
        !            75:                pg_pfnum:20;            /* physical page frame number */
        !            76: };
        !            77: struct hpte
        !            78: {
        !            79: unsigned int   
        !            80:                pg_high:12,             /* special for clustering */
        !            81:                pg_pfnum:20;
        !            82: };
        !            83: struct fpte
        !            84: {
        !            85: unsigned int   
        !            86:                pg_v:1,                 /* valid bit */
        !            87:                pg_prot:2,              /* access control */
        !            88:                :5,
        !            89:                pg_fileno:1,            /* file mapped from or TEXT or ZERO */
        !            90:                pg_fod:1,               /* is fill on demand (=1) */
        !            91:                pg_blkno:22;            /* file system block number */
        !            92: };
        !            93: #endif
        !            94: 
        !            95: #define        PD_MASK         0xffc00000      /* page directory address bits */
        !            96: #define        PD_SHIFT        22              /* page directory address bits */
        !            97: 
        !            98: #define        PG_V            0x00000001
        !            99: #define        PG_PROT         0x00000006 /* all protection bits . */
        !           100: #define        PG_FOD          0x00000200
        !           101: #define        PG_SWAPM        0x00000400
        !           102: #define PG_N           0x00000800 /* Non-cacheable */
        !           103: #define        PG_M            0x00000040
        !           104: #define PG_U           0x00000020 /* not currently used */
        !           105: #define        PG_FRAME        0xfffff000
        !           106: 
        !           107: #define        PG_FZERO        0
        !           108: #define        PG_FTEXT        1
        !           109: #define        PG_FMAX         (PG_FTEXT)
        !           110: 
        !           111: #define        PG_NOACC        0
        !           112: #define        PG_KR           0x00000000
        !           113: #define        PG_KW           0x00000002
        !           114: #define        PG_URKR         0x00000004
        !           115: #define        PG_URKW         0x00000004
        !           116: #define        PG_UW           0x00000006
        !           117: 
        !           118: /*
        !           119:  * Page Protection Exception bits
        !           120:  */
        !           121: 
        !           122: #define PGEX_P         0x01    /* Protection violation vs. not present */
        !           123: #define PGEX_W         0x02    /* during a Write cycle */
        !           124: #define PGEX_U         0x04    /* access from User mode (UPL) */
        !           125: 
        !           126: /*
        !           127:  * Pte related macros
        !           128:  */
        !           129: #define        dirty(pte)      ((pte)->pg_m)
        !           130: 
        !           131: #ifndef LOCORE
        !           132: #ifdef KERNEL
        !           133: /* utilities defined in pmap.c */
        !           134: extern struct pte *Sysmap;
        !           135: #endif
        !           136: #endif

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.