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

     /*
      * Copyright (c) 1991 Regents of the University of California.
      * All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * the Systems Programming Group of the University of Utah Computer
      * Science Department and William Jolitz of UUNET Technologies Inc.
      *
      * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * Derived from hp300 version by Mike Hibler, this version by William
     * Jolitz uses a recursive map [a pde points to the page directory] to
     * map the page tables using the pagetables themselves. This is done to
     * reduce the impact on kernel virtual memory for lots of sparse address
     * space, and to reduce the cost of memory to each process.
     *
     *      from: hp300: @(#)pmap.h 7.2 (Berkeley) 12/16/90
     *      from: @(#)pmap.h        7.4 (Berkeley) 5/12/91
     * $FreeBSD: releng/5.0/sys/i386/include/pmap.h 101349 2002-08-05 03:40:28Z alc $
     */
    
    #ifndef _MACHINE_PMAP_H_
    #define _MACHINE_PMAP_H_
    
    /*
     * Page-directory and page-table entires follow this format, with a few
     * of the fields not present here and there, depending on a lot of things.
     */
                                    /* ---- Intel Nomenclature ---- */
    #define PG_V            0x001   /* P    Valid                   */
    #define PG_RW           0x002   /* R/W  Read/Write              */
    #define PG_U            0x004   /* U/S  User/Supervisor         */
    #define PG_NC_PWT       0x008   /* PWT  Write through           */
    #define PG_NC_PCD       0x010   /* PCD  Cache disable           */
    #define PG_A            0x020   /* A    Accessed                */
    #define PG_M            0x040   /* D    Dirty                   */
    #define PG_PS           0x080   /* PS   Page size (0=4k,1=4M)   */
    #define PG_G            0x100   /* G    Global                  */
    #define PG_AVAIL1       0x200   /*    / Available for system    */
    #define PG_AVAIL2       0x400   /*   <  programmers use         */
    #define PG_AVAIL3       0x800   /*    \                         */
    
    
    /* Our various interpretations of the above */
    #define PG_W            PG_AVAIL1       /* "Wired" pseudoflag */
    #define PG_MANAGED      PG_AVAIL2
    #define PG_FRAME        (~PAGE_MASK)
    #define PG_PROT         (PG_RW|PG_U)    /* all protection bits . */
    #define PG_N            (PG_NC_PWT|PG_NC_PCD)   /* Non-cacheable */
    
    /*
     * Page Protection Exception bits
     */
    
    #define PGEX_P          0x01    /* Protection violation vs. not present */
    #define PGEX_W          0x02    /* during a Write cycle */
    #define PGEX_U          0x04    /* access from User mode (UPL) */
    
    /*
     * Size of Kernel address space.  This is the number of page table pages
     * (4MB each) to use for the kernel.  256 pages == 1 Gigabyte.
     * This **MUST** be a multiple of 4 (eg: 252, 256, 260, etc).
     */
    #ifndef KVA_PAGES
    #define KVA_PAGES       256
    #endif
    
    /*
     * Pte related macros
     */
    #define VADDR(pdi, pti) ((vm_offset_t)(((pdi)<<PDRSHIFT)|((pti)<<PAGE_SHIFT)))
    
    #ifndef NKPT
   #define NKPT            30      /* actual number of kernel page tables */
   #endif
   #ifndef NKPDE
   #ifdef SMP
   #define NKPDE   (KVA_PAGES - 2) /* addressable number of page tables/pde's */
   #else
   #define NKPDE   (KVA_PAGES - 1) /* addressable number of page tables/pde's */
   #endif
   #endif
   
   /*
    * The *PTDI values control the layout of virtual memory
    *
    * XXX This works for now, but I am not real happy with it, I'll fix it
    * right after I fix locore.s and the magic 28K hole
    *
    * SMP_PRIVPAGES: The per-cpu address space is 0xff80000 -> 0xffbfffff
    */
   #define APTDPTDI        (NPDEPG-1)      /* alt ptd entry that points to APTD */
   #ifdef SMP
   #define MPPTDI          (APTDPTDI-1)    /* per cpu ptd entry */
   #define KPTDI           (MPPTDI-NKPDE)  /* start of kernel virtual pde's */
   #else
   #define KPTDI           (APTDPTDI-NKPDE)/* start of kernel virtual pde's */
   #endif  /* SMP */
   #define PTDPTDI         (KPTDI-1)       /* ptd entry that points to ptd! */
   #define UMAXPTDI        (PTDPTDI-1)     /* ptd entry for user space end */
   #define UMAXPTEOFF      (NPTEPG)        /* pte entry for user space end */
   
   /*
    * XXX doesn't really belong here I guess...
    */
   #define ISA_HOLE_START    0xa0000
   #define ISA_HOLE_LENGTH (0x100000-ISA_HOLE_START)
   
   #ifndef LOCORE
   
   #include <sys/queue.h>
   
   typedef u_int32_t pd_entry_t;
   typedef u_int32_t pt_entry_t;
   
   #define PDESIZE         sizeof(pd_entry_t) /* for assembly files */
   #define PTESIZE         sizeof(pt_entry_t) /* for assembly files */
   
   /*
    * Address of current and alternate address space page table maps
    * and directories.
    */
   #ifdef _KERNEL
   extern pt_entry_t PTmap[], APTmap[];
   extern pd_entry_t PTD[], APTD[];
   extern pd_entry_t PTDpde, APTDpde;
   
   extern pd_entry_t *IdlePTD;     /* physical address of "Idle" state directory */
   #endif
   
   #ifdef _KERNEL
   /*
    * virtual address to page table entry and
    * to physical address. Likewise for alternate address space.
    * Note: these work recursively, thus vtopte of a pte will give
    * the corresponding pde that in turn maps it.
    */
   #define vtopte(va)      (PTmap + i386_btop(va))
   #define avtopte(va)     (APTmap + i386_btop(va))
   
   /*
    *      Routine:        pmap_kextract
    *      Function:
    *              Extract the physical page address associated
    *              kernel virtual address.
    */
   static __inline vm_offset_t
   pmap_kextract(vm_offset_t va)
   {
           vm_offset_t pa;
           if ((pa = (vm_offset_t) PTD[va >> PDRSHIFT]) & PG_PS) {
                   pa = (pa & ~(NBPDR - 1)) | (va & (NBPDR - 1));
           } else {
                   pa = *(vm_offset_t *)vtopte(va);
                   pa = (pa & PG_FRAME) | (va & PAGE_MASK);
           }
           return pa;
   }
   
   #define vtophys(va)     pmap_kextract(((vm_offset_t) (va)))
   #endif
   
   /*
    * Pmap stuff
    */
   struct  pv_entry;
   
   struct md_page {
           int pv_list_count;
           TAILQ_HEAD(,pv_entry)   pv_list;
   };
   
   struct pmap {
           pd_entry_t              *pm_pdir;       /* KVA of page directory */
           vm_object_t             pm_pteobj;      /* Container for pte's */
           TAILQ_HEAD(,pv_entry)   pm_pvlist;      /* list of mappings in pmap */
           int                     pm_active;      /* active on cpus */
           struct pmap_statistics  pm_stats;       /* pmap statistics */
           struct  vm_page         *pm_ptphint;    /* pmap ptp hint */
           LIST_ENTRY(pmap)        pm_list;        /* List of all pmaps */
   };
   
   #define pmap_page_is_mapped(m)  (!TAILQ_EMPTY(&(m)->md.pv_list))
   #define pmap_resident_count(pmap) (pmap)->pm_stats.resident_count
   
   typedef struct pmap     *pmap_t;
   
   #ifdef _KERNEL
   extern struct pmap      kernel_pmap_store;
   #define kernel_pmap     (&kernel_pmap_store)
   #endif
   
   /*
    * For each vm_page_t, there is a list of all currently valid virtual
    * mappings of that page.  An entry is a pv_entry_t, the list is pv_table.
    */
   typedef struct pv_entry {
           pmap_t          pv_pmap;        /* pmap where mapping lies */
           vm_offset_t     pv_va;          /* virtual address for mapping */
           TAILQ_ENTRY(pv_entry)   pv_list;
           TAILQ_ENTRY(pv_entry)   pv_plist;
           vm_page_t       pv_ptem;        /* VM page for pte */
   } *pv_entry_t;
   
   #define PV_ENTRY_NULL   ((pv_entry_t) 0)
   
   #define PV_CI           0x01    /* all entries must be cache inhibited */
   #define PV_PTPAGE       0x02    /* entry maps a page table page */
   
   #ifdef  _KERNEL
   
   #define NPPROVMTRR              8
   #define PPRO_VMTRRphysBase0     0x200
   #define PPRO_VMTRRphysMask0     0x201
   struct ppro_vmtrr {
           u_int64_t base, mask;
   };
   extern struct ppro_vmtrr PPro_vmtrr[NPPROVMTRR];
   
   extern caddr_t  CADDR1;
   extern pt_entry_t *CMAP1;
   extern vm_offset_t avail_end;
   extern vm_offset_t avail_start;
   extern vm_offset_t clean_eva;
   extern vm_offset_t clean_sva;
   extern vm_offset_t phys_avail[];
   extern char *ptvmmap;           /* poor name! */
   extern vm_offset_t virtual_avail;
   extern vm_offset_t virtual_end;
   
   void    pmap_bootstrap(vm_offset_t, vm_offset_t);
   void    *pmap_mapdev(vm_offset_t, vm_size_t);
   void    pmap_unmapdev(vm_offset_t, vm_size_t);
   pt_entry_t *pmap_pte(pmap_t, vm_offset_t) __pure2;
   vm_page_t pmap_use_pt(pmap_t, vm_offset_t);
   void    pmap_set_opt(void);
   void    pmap_invalidate_page(pmap_t, vm_offset_t);
   void    pmap_invalidate_range(pmap_t, vm_offset_t, vm_offset_t);
   void    pmap_invalidate_all(pmap_t);
   
   #endif /* _KERNEL */
   
   #endif /* !LOCORE */
   
   #endif /* !_MACHINE_PMAP_H_ */

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