The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/include/pmap.h

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    1 /*
    2  * Copyright (c) 1991 Regents of the University of California.
    3  * All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * the Systems Programming Group of the University of Utah Computer
    7  * Science Department and William Jolitz of UUNET Technologies Inc.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  * 3. All advertising materials mentioning features or use of this software
   18  *    must display the following acknowledgement:
   19  *      This product includes software developed by the University of
   20  *      California, Berkeley and its contributors.
   21  * 4. Neither the name of the University nor the names of its contributors
   22  *    may be used to endorse or promote products derived from this software
   23  *    without specific prior written permission.
   24  *
   25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   35  * SUCH DAMAGE.
   36  *
   37  * Derived from hp300 version by Mike Hibler, this version by William
   38  * Jolitz uses a recursive map [a pde points to the page directory] to
   39  * map the page tables using the pagetables themselves. This is done to
   40  * reduce the impact on kernel virtual memory for lots of sparse address
   41  * space, and to reduce the cost of memory to each process.
   42  *
   43  *      from: hp300: @(#)pmap.h 7.2 (Berkeley) 12/16/90
   44  *      from: @(#)pmap.h        7.4 (Berkeley) 5/12/91
   45  * $FreeBSD: src/sys/i386/include/pmap.h,v 1.46.2.1 1999/09/05 08:11:58 peter Exp $
   46  */
   47 
   48 #ifndef _MACHINE_PMAP_H_
   49 #define _MACHINE_PMAP_H_
   50 
   51 /*
   52  * Page-directory and page-table entires follow this format, with a few
   53  * of the fields not present here and there, depending on a lot of things.
   54  */
   55                                 /* ---- Intel Nomenclature ---- */
   56 #define PG_V            0x001   /* P    Valid                   */
   57 #define PG_RW           0x002   /* R/W  Read/Write              */
   58 #define PG_U            0x004   /* U/S  User/Supervisor         */
   59 #define PG_NC_PWT       0x008   /* PWT  Write through           */
   60 #define PG_NC_PCD       0x010   /* PCD  Cache disable           */
   61 #define PG_A            0x020   /* A    Accessed                */
   62 #define PG_M            0x040   /* D    Dirty                   */
   63 #define PG_PS           0x080   /* PS   Page size (0=4k,1=4M)   */
   64 #define PG_G            0x100   /* G    Global                  */
   65 #define PG_AVAIL1       0x200   /*    / Available for system    */
   66 #define PG_AVAIL2       0x400   /*   <  programmers use         */
   67 #define PG_AVAIL3       0x800   /*    \                         */
   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        (~PAGE_MASK)
   74 #define PG_PROT         (PG_RW|PG_U)    /* all protection bits . */
   75 #define PG_N            (PG_NC_PWT|PG_NC_PCD)   /* Non-cacheable */
   76 
   77 /*
   78  * Page Protection Exception bits
   79  */
   80 
   81 #define PGEX_P          0x01    /* Protection violation vs. not present */
   82 #define PGEX_W          0x02    /* during a Write cycle */
   83 #define PGEX_U          0x04    /* access from User mode (UPL) */
   84 
   85 /*
   86  * Pte related macros
   87  */
   88 #define VADDR(pdi, pti) ((vm_offset_t)(((pdi)<<PDRSHIFT)|((pti)<<PAGE_SHIFT)))
   89 
   90 #ifndef NKPT
   91 #define NKPT                    9       /* actual number of kernel page tables */
   92 #endif
   93 #ifndef NKPDE
   94 #define NKPDE                   63      /* addressable number of page tables/pde's */
   95 #endif
   96 
   97 /*
   98  * The *PTDI values control the layout of virtual memory
   99  *
  100  * XXX This works for now, but I am not real happy with it, I'll fix it
  101  * right after I fix locore.s and the magic 28K hole
  102  */
  103 #define APTDPTDI        (NPDEPG-1)      /* alt ptd entry that points to APTD */
  104 #define KPTDI           (APTDPTDI-NKPDE)/* start of kernel virtual pde's */
  105 #define PTDPTDI         (KPTDI-1)       /* ptd entry that points to ptd! */
  106 #define KSTKPTDI        (PTDPTDI-1)     /* ptd entry for u./kernel&user stack */
  107 #define KSTKPTEOFF      (NPTEPG-UPAGES) /* pte entry for kernel stack */
  108 
  109 /*
  110  * XXX doesn't really belong here I guess...
  111  */
  112 #define ISA_HOLE_START    0xa0000
  113 #define ISA_HOLE_LENGTH (0x100000-ISA_HOLE_START)
  114 
  115 #ifndef LOCORE
  116 
  117 #include <sys/queue.h>
  118 
  119 typedef unsigned int *pd_entry_t;
  120 typedef unsigned int *pt_entry_t;
  121 
  122 #define PDESIZE         sizeof(pd_entry_t) /* for assembly files */
  123 #define PTESIZE         sizeof(pt_entry_t) /* for assembly files */
  124 
  125 /*
  126  * Address of current and alternate address space page table maps
  127  * and directories.
  128  */
  129 #ifdef KERNEL
  130 extern pt_entry_t PTmap[], APTmap[], Upte;
  131 extern pd_entry_t PTD[], APTD[], PTDpde, APTDpde, Upde;
  132 
  133 extern int      IdlePTD;        /* physical address of "Idle" state directory */
  134 #endif
  135 
  136 /*
  137  * virtual address to page table entry and
  138  * to physical address. Likewise for alternate address space.
  139  * Note: these work recursively, thus vtopte of a pte will give
  140  * the corresponding pde that in turn maps it.
  141  */
  142 #define vtopte(va)      (PTmap + i386_btop(va))
  143 #define vtophys(va)     (((int) (*vtopte(va))&PG_FRAME) | ((int)(va) & PAGE_MASK))
  144 
  145 #define avtopte(va)     (APTmap + i386_btop(va))
  146 #define avtophys(va)    (((int) (*avtopte(va))&PG_FRAME) | ((int)(va) & PAGE_MASK))
  147 
  148 #ifdef KERNEL
  149 /*
  150  *      Routine:        pmap_kextract
  151  *      Function:
  152  *              Extract the physical page address associated
  153  *              kernel virtual address.
  154  */
  155 static __inline vm_offset_t
  156 pmap_kextract(vm_offset_t va)
  157 {
  158         vm_offset_t pa = *(int *)vtopte(va);
  159         pa = (pa & PG_FRAME) | (va & PAGE_MASK);
  160         return pa;
  161 }
  162 #endif
  163 
  164 /*
  165  * Pmap stuff
  166  */
  167 struct  pv_entry;
  168 typedef struct {
  169         int pv_list_count;
  170         struct vm_page          *pv_vm_page;
  171         TAILQ_HEAD(,pv_entry)   pv_list;
  172 } pv_table_t;
  173 
  174 struct pmap {
  175         pd_entry_t              *pm_pdir;       /* KVA of page directory */
  176         vm_object_t             pm_pteobj;      /* Container for pte's */
  177         TAILQ_HEAD(,pv_entry)   pm_pvlist;      /* list of mappings in pmap */
  178         int                     pm_count;       /* reference count */
  179         int                     pm_flags;       /* pmap flags */
  180         struct pmap_statistics  pm_stats;       /* pmap statistics */
  181         struct  vm_page         *pm_ptphint;    /* pmap ptp hint */
  182 };
  183 
  184 #define pmap_resident_count(pmap) (pmap)->pm_stats.resident_count
  185 
  186 #define PM_FLAG_LOCKED  0x1
  187 #define PM_FLAG_WANTED  0x2
  188 
  189 typedef struct pmap     *pmap_t;
  190 
  191 #ifdef KERNEL
  192 extern pmap_t           kernel_pmap;
  193 #endif
  194 
  195 /*
  196  * For each vm_page_t, there is a list of all currently valid virtual
  197  * mappings of that page.  An entry is a pv_entry_t, the list is pv_table.
  198  */
  199 typedef struct pv_entry {
  200         pmap_t          pv_pmap;        /* pmap where mapping lies */
  201         vm_offset_t     pv_va;          /* virtual address for mapping */
  202         TAILQ_ENTRY(pv_entry)   pv_list;
  203 #if PMAP_PVLIST
  204         TAILQ_ENTRY(pv_entry)   pv_plist;
  205 #endif
  206         vm_page_t       pv_ptem;        /* VM page for pte */
  207 } *pv_entry_t;
  208 
  209 #define PV_ENTRY_NULL   ((pv_entry_t) 0)
  210 
  211 #define PV_CI           0x01    /* all entries must be cache inhibited */
  212 #define PV_PTPAGE       0x02    /* entry maps a page table page */
  213 
  214 #ifdef  KERNEL
  215 
  216 extern caddr_t  CADDR1;
  217 extern pt_entry_t *CMAP1;
  218 extern vm_offset_t avail_end;
  219 extern vm_offset_t avail_start;
  220 extern vm_offset_t phys_avail[];
  221 extern vm_offset_t virtual_avail;
  222 extern vm_offset_t virtual_end;
  223 
  224 void    pmap_bootstrap __P(( vm_offset_t, vm_offset_t));
  225 pmap_t  pmap_kernel __P((void));
  226 void    *pmap_mapdev __P((vm_offset_t, vm_size_t));
  227 unsigned *pmap_pte __P((pmap_t, vm_offset_t)) __pure2;
  228 vm_page_t pmap_use_pt __P((pmap_t, vm_offset_t));
  229 
  230 #endif /* KERNEL */
  231 
  232 #endif /* !LOCORE */
  233 
  234 #endif /* !_MACHINE_PMAP_H_ */

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