sys/cpu/x86_64/include/pmap.h

   1 /*-
   2  * Copyright (c) 1991 Regents of the University of California.
   3  * Copyright (c) 2003 Peter Wemm.
   4  * Copyright (c) 2008 The DragonFly Project.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * the Systems Programming Group of the University of Utah Computer
   9  * Science Department and William Jolitz of UUNET Technologies Inc.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 4. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  *
  35  * Derived from hp300 version by Mike Hibler, this version by William
  36  * Jolitz uses a recursive map [a pde points to the page directory] to
  37  * map the page tables using the pagetables themselves. This is done to
  38  * reduce the impact on kernel virtual memory for lots of sparse address
  39  * space, and to reduce the cost of memory to each process.
  40  *
  41  * from: hp300: @(#)pmap.h      7.2 (Berkeley) 12/16/90
  42  * from: @(#)pmap.h     7.4 (Berkeley) 5/12/91
  43  */
  44
  45 #ifndef _CPU_PMAP_H_
  46 #define _CPU_PMAP_H_
  47
  48 /*
  49  * Page-directory and page-table entries follow this format, with a few
  50  * of the fields not present here and there, depending on a lot of things.
  51  */
  52                                 /* ---- Intel Nomenclature ---- */
  53 #define PG_V            0x001   /* P    Valid                   */
  54 #define PG_RW           0x002   /* R/W  Read/Write              */
  55 #define PG_U            0x004   /* U/S  User/Supervisor         */
  56 #define PG_NC_PWT       0x008   /* PWT  Write through           */
  57 #define PG_NC_PCD       0x010   /* PCD  Cache disable           */
  58 #define PG_A            0x020   /* A    Accessed                */
  59 #define PG_M            0x040   /* D    Dirty                   */
  60 #define PG_PS           0x080   /* PS   Page size (0=4k,1=2M)   */
  61 #define PG_PTE_PAT      0x080   /* PAT  PAT index               */
  62 #define PG_G            0x100   /* G    Global                  */
  63 #define PG_AVAIL1       0x200   /*    / Available for system    */
  64 #define PG_AVAIL2       0x400   /*   <  programmers use         */
  65 #define PG_AVAIL3       0x800   /*    \                         */
  66 #define PG_PDE_PAT      0x1000  /* PAT  PAT index               */
  67 #define PG_NX           (1ul<<63) /* No-execute */
  68
  69
  70 /* Our various interpretations of the above */
  71 #define PG_W            PG_AVAIL1       /* "Wired" pseudoflag */
  72 #define PG_MANAGED      PG_AVAIL2
  73 #define PG_FRAME        (0x000ffffffffff000ul)
  74 #define PG_PS_FRAME     (0x000fffffffe00000ul)
  75 #define PG_PROT         (PG_RW|PG_U)    /* all protection bits . */
  76 #define PG_N            (PG_NC_PWT|PG_NC_PCD)   /* Non-cacheable */
  77
  78 /*
  79  * Promotion to a 2MB (PDE) page mapping requires that the corresponding 4KB
  80  * (PTE) page mappings have identical settings for the following fields:
  81  */
  82 #define PG_PTE_PROMOTE  (PG_NX | PG_MANAGED | PG_W | PG_G | PG_PTE_PAT | \
  83             PG_M | PG_A | PG_NC_PCD | PG_NC_PWT | PG_U | PG_RW | PG_V)
  84
  85 /*
  86  * Page Protection Exception bits
  87  */
  88
  89 #define PGEX_P          0x01    /* Protection violation vs. not present */
  90 #define PGEX_W          0x02    /* during a Write cycle */
  91 #define PGEX_U          0x04    /* access from User mode (UPL) */
  92 #define PGEX_RSV        0x08    /* reserved PTE field is non-zero */
  93 #define PGEX_I          0x10    /* during an instruction fetch */
  94
  95 /*
  96  * Virtual kernel bits, managed by software.  Stored in tf_xflags.
  97  *
  98  * PGEX_FPFAULT - Force the FP unit to generate a T_DNA fault if an
  99  *                emulated user process tried to use it.  This bit is
 100  *                only used by vmspace_ctl().
 101  *
 102  * PGEX_MAILBOX - Set in xflags by signal code to indicate that a mailbox
 103  *                signal was pending.  Remerged on signal return.  This
 104  *                bit is only used in a signal vector frame.
 105  */
 106 #define PGEX_MAILBOX    0x40
 107 #define PGEX_FPFAULT    0x80
 108
 109 #endif /* !_CPU_PMAP_H_ */