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Annotation of src/sys/arch/i386/include/pte.h, Revision 1.6

1.1       cgd         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:  *
1.2       cgd        36:  *     from: @(#)pte.h 5.5 (Berkeley) 5/9/91
1.6     ! mycroft    37:  *     $Id: pte.h,v 1.5 1994/08/15 14:49:16 mycroft Exp $
1.1       cgd        38:  */
                     39:
                     40: /*
                     41:  * 386 page table entry and page table directory
                     42:  * W.Jolitz, 8/89
                     43:  *
                     44:  * There are two major kinds of pte's: those which have ever existed (and are
                     45:  * thus either now in core or on the swap device), and those which have
                     46:  * never existed, but which will be filled on demand at first reference.
                     47:  * There is a structure describing each.  There is also an ancillary
                     48:  * structure used in page clustering.
                     49:  */
                     50:
1.3       andrew     51: #ifndef _I386_PTE_H_
                     52: #define _I386_PTE_H_
                     53:
1.4       mycroft    54: #define        PDSHIFT         22              /* LOG2(NBPDR) */
                     55: #define        NBPD            (1 << PDSHIFT)  /* bytes/page dir */
                     56: #define        PDOFSET         (NBPD-1)        /* byte offset into page dir */
                     57: #define        NPTEPD          (NBPD / NBPG)
                     58:
1.1       cgd        59: #ifndef LOCORE
1.5       mycroft    60: typedef int    pd_entry_t;             /* page directory entry */
                     61: typedef int    pt_entry_t;             /* Mach page table entry */
1.1       cgd        62: #endif
                     63:
                     64: #define        PD_MASK         0xffc00000      /* page directory address bits */
1.4       mycroft    65: #define        PT_MASK         0x003ff000      /* page table address bits */
1.1       cgd        66:
1.4       mycroft    67: #define        PG_V            0x00000001      /* present */
                     68: #define        PG_RO           0x00000000      /* read-only by user (and kernel if 486) */
                     69: #define        PG_RW           0x00000002      /* read-write by user */
                     70: #define        PG_u            0x00000004      /* accessible by user */
                     71: #define        PG_PROT         0x00000006      /* all protection bits */
                     72: #define        PG_N            0x00000018      /* non-cacheable */
                     73: #define        PG_U            0x00000020      /* has been used */
                     74: #define        PG_M            0x00000040      /* has been modified */
                     75: #define        PG_W            0x00000200      /* page is wired */
                     76: #define        PG_FRAME        0xfffff000      /* page frame mask */
1.1       cgd        77:
                     78: #define        PG_FZERO        0
                     79: #define        PG_FTEXT        1
                     80: #define        PG_FMAX         (PG_FTEXT)
                     81:
                     82: #define        PG_NOACC        0
                     83: #define        PG_KR           0x00000000
                     84: #define        PG_KW           0x00000002
                     85: #define        PG_URKR         0x00000004
                     86: #define        PG_URKW         0x00000004
                     87: #define        PG_UW           0x00000006
                     88:
                     89: /*
                     90:  * Page Protection Exception bits
                     91:  */
                     92: #define PGEX_P         0x01    /* Protection violation vs. not present */
                     93: #define PGEX_W         0x02    /* during a Write cycle */
                     94: #define PGEX_U         0x04    /* access from User mode (UPL) */
                     95:
                     96: #ifndef LOCORE
                     97: #ifdef KERNEL
                     98: /* utilities defined in pmap.c */
1.5       mycroft    99: extern pt_entry_t *Sysmap;
1.1       cgd       100: #endif
                    101: #endif
1.3       andrew    102:
                    103: #endif /* _I386_PTE_H_ */