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Annotation of sys/arch/solbourne/include/pte.h, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: pte.h,v 1.1 2005/04/19 21:30:18 miod Exp $    */
                      2: /*
                      3:  * Copyright (c) 2005, Miodrag Vallat
                      4:  *
                      5:  * Redistribution and use in source and binary forms, with or without
                      6:  * modification, are permitted provided that the following conditions
                      7:  * are met:
                      8:  * 1. Redistributions of source code must retain the above copyright
                      9:  *    notice, this list of conditions and the following disclaimer.
                     10:  * 2. Redistributions in binary form must reproduce the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer in the
                     12:  *    documentation and/or other materials provided with the distribution.
                     13:  *
                     14:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     15:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
                     16:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
                     17:  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
                     18:  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
                     19:  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
                     20:  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     21:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
                     22:  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
                     23:  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     24:  * POSSIBILITY OF SUCH DAMAGE.
                     25:  */
                     26:
                     27: /*
                     28:  * KAP page table entries.
                     29:  *
                     30:  * Ref/Mod bits are handled in software.
                     31:  */
                     32:
                     33: /*
                     34:  * First-level : Page Directory Tables (topmost 9 bits of a va)
                     35:  *
                     36:  * Page directory entries contain both the pa and the va of the page
                     37:  * tables they point to.
                     38:  */
                     39:
                     40: #define        PDT_INDEX_SIZE          9
                     41: #define        PDT_INDEX_SHIFT         23
                     42: #define        PDT_INDEX_MASK          0xff800000
                     43:
                     44: /*
                     45:  * Second-level: Page Table Entries (middle 10 bits of a va)
                     46:  */
                     47:
                     48: #define        PT_INDEX_SIZE           10
                     49: #define        PT_INDEX_SHIFT          13
                     50: #define        PT_INDEX_MASK           0x007fe000
                     51:
                     52: #define        PG_V                    0x00000001
                     53: #define        PG_NV                   0x00000000
                     54: #define        PG_RO                   0x00000002      /* read only */
                     55: #define        PG_RW                   0x00000000
                     56: #define        PG_PROT                 (PG_RO | PG_S)
                     57: #define        PG_S                    0x00000004      /* supervisor only */
                     58: #define        PG_MA                   0x00000018      /* memory attributes mask */
                     59: #define        PG_G                    0x00000020      /* global */
                     60: /* software bits from now on... */
                     61: #define        PG_W                    0x00000040      /* wired */
                     62: #define        PG_M                    0x00000080      /* modified */
                     63: #define        PG_U                    0x00000100      /* referenced */
                     64:                        /*      0x00001e00      unused */
                     65: #define        PG_FRAME                0xffffe000      /* PFN mask */
                     66:
                     67: /* memory attributes */
                     68: #define        PG_IO                   0x00000000      /* not cached */
                     69: #define        PG_CACHE                0x00000008      /* cached */
                     70: #define        PG_BYTE_SHARED          0x00000010      /* byte-writeable shared */
                     71: #define        PG_SHARED               0x00000018      /* non byte-writeable shared */
                     72:
                     73: /*
                     74:  * Page directory constants
                     75:  */
                     76:
                     77: #define        PDT_SIZE                4096    /* size of a page directory table */
                     78: #define        PT_SIZE                 4096    /* size of a page table */
                     79:
                     80: #define        NBR_PDE                 (PDT_SIZE / 8)
                     81: #define        NBR_PTE                 (PT_SIZE / 4)
                     82:
                     83: #define        NBSEG                   (1 << PDT_INDEX_SHIFT)
                     84:
                     85: #if !defined(_LOCORE)
                     86:
                     87: typedef        u_int32_t       pt_entry_t;
                     88:
                     89: typedef struct {
                     90:        u_int32_t       pde_pa;
                     91:        pt_entry_t*     pde_va;
                     92: } pd_entry_t;
                     93:
                     94: #endif