FreeBSD/Linux Kernel Cross Reference
sys/mips/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.
     * 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
     *      from: src/sys/i386/include/pmap.h,v 1.65.2.2 2000/11/30 01:54:42 peter
     *      JNPR: pmap.h,v 1.7.2.1 2007/09/10 07:44:12 girish
     *      $FreeBSD: releng/8.0/sys/mips/include/pmap.h 195649 2009-07-12 23:31:20Z alc $
     */
    
    #ifndef _MACHINE_PMAP_H_
    #define _MACHINE_PMAP_H_
    
    #include <machine/vmparam.h>
    #include <machine/pte.h>
    
    #define VADDR(pdi, pti) ((vm_offset_t)(((pdi)<<PDRSHIFT)|((pti)<<PAGE_SHIFT)))
    
    #define NKPT            120     /* actual number of kernel page tables */
    
    #ifndef NKPDE
    #define NKPDE           255     /* addressable number of page tables/pde's */
    #endif
    
    #define KPTDI           (VM_MIN_KERNEL_ADDRESS >> SEGSHIFT)
    #define NUSERPGTBLS     (VM_MAXUSER_ADDRESS >> SEGSHIFT)
    
    #ifndef LOCORE
    
    #include <sys/queue.h>
    #include <sys/_lock.h>
    #include <sys/_mutex.h>
    
    /*
     * Pmap stuff
     */
    struct pv_entry;
    
    struct md_page {
            int pv_list_count;
            int pv_flags;
            TAILQ_HEAD(, pv_entry) pv_list;
    };
    
    #define PV_TABLE_MOD            0x01    /* modified */
    #define PV_TABLE_REF            0x02    /* referenced */
    
    #define ASID_BITS               8
    #define ASIDGEN_BITS            (32 - ASID_BITS)
    #define ASIDGEN_MASK            ((1 << ASIDGEN_BITS) - 1)
    
    struct pmap {
            pd_entry_t *pm_segtab;  /* KVA of segment table */
            TAILQ_HEAD(, pv_entry) pm_pvlist;       /* list of mappings in
                                                     * pmap */
            int pm_active;          /* active on cpus */
            struct {
                    u_int32_t asid:ASID_BITS;       /* TLB address space tag */
                    u_int32_t gen:ASIDGEN_BITS;     /* its generation number */
            }      pm_asid[MAXSMPCPU];
            struct pmap_statistics pm_stats;        /* pmap statistics */
            struct vm_page *pm_ptphint;     /* pmap ptp hint */
            struct mtx pm_mtx;
    };
   
   typedef struct pmap *pmap_t;
   
   #ifdef  _KERNEL
   
   pt_entry_t *pmap_pte(pmap_t, vm_offset_t);
   pd_entry_t pmap_segmap(pmap_t pmap, vm_offset_t va);
   vm_offset_t pmap_kextract(vm_offset_t va);
   
   #define vtophys(va)     pmap_kextract(((vm_offset_t) (va)))
   
   extern struct pmap      kernel_pmap_store;
   #define kernel_pmap     (&kernel_pmap_store)
   
   #define PMAP_LOCK(pmap)         mtx_lock(&(pmap)->pm_mtx)
   #define PMAP_LOCK_ASSERT(pmap, type)    mtx_assert(&(pmap)->pm_mtx, (type))
   #define PMAP_LOCK_DESTROY(pmap) mtx_destroy(&(pmap)->pm_mtx)
   #define PMAP_LOCK_INIT(pmap)    mtx_init(&(pmap)->pm_mtx, "pmap", \
                                       NULL, MTX_DEF)
   #define PMAP_LOCKED(pmap)       mtx_owned(&(pmap)->pm_mtx)
   #define PMAP_MTX(pmap)          (&(pmap)->pm_mtx)
   #define PMAP_TRYLOCK(pmap)      mtx_trylock(&(pmap)->pm_mtx)
   #define PMAP_UNLOCK(pmap)       mtx_unlock(&(pmap)->pm_mtx)
   
   #define PMAP_LGMEM_LOCK_INIT(sysmap) mtx_init(&(sysmap)->lock, "pmap-lgmem", \
                                       "per-cpu-map", (MTX_DEF| MTX_DUPOK))
   #define PMAP_LGMEM_LOCK(sysmap) mtx_lock(&(sysmap)->lock)
   #define PMAP_LGMEM_UNLOCK(sysmap) mtx_unlock(&(sysmap)->lock)
   #define PMAP_LGMEM_DESTROY(sysmap) mtx_destroy(&(sysmap)->lock)
   
   /*
    * 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 */
           boolean_t pv_wired;     /* whether this entry is wired */
   }       *pv_entry_t;
   
   
   #if defined(DIAGNOSTIC)
   #define PMAP_DIAGNOSTIC
   #endif
   
   extern vm_offset_t phys_avail[];
   extern char *ptvmmap;           /* poor name! */
   extern vm_offset_t virtual_avail;
   extern vm_offset_t virtual_end;
   extern pd_entry_t *segbase;
   
   extern vm_paddr_t mips_wired_tlb_physmem_start;
   extern vm_paddr_t mips_wired_tlb_physmem_end;
   extern u_int need_wired_tlb_page_pool;
   
   #define pmap_page_get_memattr(m)        VM_MEMATTR_DEFAULT
   #define pmap_page_is_mapped(m)  (!TAILQ_EMPTY(&(m)->md.pv_list))
   #define pmap_page_set_memattr(m, ma)    (void)0
   
   void pmap_bootstrap(void);
   void *pmap_mapdev(vm_offset_t, vm_size_t);
   void pmap_unmapdev(vm_offset_t, vm_size_t);
   vm_offset_t pmap_steal_memory(vm_size_t size);
   void pmap_set_modified(vm_offset_t pa);
   int page_is_managed(vm_offset_t pa);
   void pmap_page_is_free(vm_page_t m);
   void pmap_kenter(vm_offset_t va, vm_paddr_t pa);
   void pmap_kremove(vm_offset_t va);
   void *pmap_kenter_temporary(vm_paddr_t pa, int i);
   void pmap_kenter_temporary_free(vm_paddr_t pa);
   int pmap_compute_pages_to_dump(void);
   void pmap_update_page(pmap_t pmap, vm_offset_t va, pt_entry_t pte);
   
   /*
    * floating virtual pages (FPAGES)
    *
    * These are the reserved virtual memory areas which can be
    * mapped to any physical memory.
    */
   #define FPAGES                  2
   #define FPAGES_SHARED           2
   #define FSPACE                  ((FPAGES * MAXCPU + FPAGES_SHARED)  * PAGE_SIZE)
   #define PMAP_FPAGE1             0x00    /* Used by pmap_zero_page &
                                            * pmap_copy_page */
   #define PMAP_FPAGE2             0x01    /* Used by pmap_copy_page */
   
   #define PMAP_FPAGE3             0x00    /* Used by pmap_zero_page_idle */
   #define PMAP_FPAGE_KENTER_TEMP  0x01    /* Used by coredump */
   
   struct fpage {
           vm_offset_t kva;
           u_int state;
   };
   
   struct sysmaps {
           struct mtx lock;
           struct fpage fp[FPAGES];
   };
   
   vm_offset_t 
   pmap_map_fpage(vm_paddr_t pa, struct fpage *fp,
       boolean_t check_unmaped);
   void pmap_unmap_fpage(vm_paddr_t pa, struct fpage *fp);
   
   #endif                          /* _KERNEL */
   
   #endif                          /* !LOCORE */
   
   #endif                          /* !_MACHINE_PMAP_H_ */

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