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/11.0/sys/mips/include/pmap.h 292469 2015-12-19 18:42:50Z alc $
     */
    
    #ifndef _MACHINE_PMAP_H_
    #define _MACHINE_PMAP_H_
    
    #include <machine/vmparam.h>
    #include <machine/pte.h>
    
    #if defined(__mips_n32) || defined(__mips_n64) /* PHYSADDR_64BIT */
    #define NKPT            256     /* mem > 4G, vm_page_startup needs more KPTs */
    #else
    #define NKPT            120     /* actual number of kernel page tables */
    #endif
    
    #ifndef LOCORE
    
    #include <sys/queue.h>
    #include <sys/_cpuset.h>
    #include <sys/_lock.h>
    #include <sys/_mutex.h>
    
    /*
     * Pmap stuff
     */
    struct pv_entry;
    struct pv_chunk;
    
    struct md_page {
            int pv_flags;
            TAILQ_HEAD(, pv_entry) pv_list;
    };
    
    #define PV_TABLE_REF            0x02    /* referenced */
    #define PV_MEMATTR_UNCACHEABLE  0x04
    
    #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_chunk)  pm_pvchunk;     /* list of mappings in pmap */
            cpuset_t        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 mtx pm_mtx;
    };
    
    typedef struct pmap *pmap_t;
    
    #ifdef  _KERNEL
    
    pt_entry_t *pmap_pte(pmap_t, vm_offset_t);
   vm_paddr_t pmap_kextract(vm_offset_t va);
   
   #define vtophys(va)     pmap_kextract(((vm_offset_t) (va)))
   #define pmap_asid(pmap) (pmap)->pm_asid[PCPU_GET(cpuid)].asid
   
   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)
   
   /*
    * 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 {
           vm_offset_t pv_va;      /* virtual address for mapping */
           TAILQ_ENTRY(pv_entry) pv_list;
   }       *pv_entry_t;
   
   /*
    * pv_entries are allocated in chunks per-process.  This avoids the
    * need to track per-pmap assignments.
    */
   #ifdef __mips_n64
   #define _NPCM   3
   #define _NPCPV  168
   #else
   #define _NPCM   11
   #define _NPCPV  336
   #endif
   struct pv_chunk {
           pmap_t                  pc_pmap;
           TAILQ_ENTRY(pv_chunk)   pc_list;
           u_long                  pc_map[_NPCM];  /* bitmap; 1 = free */
           TAILQ_ENTRY(pv_chunk)   pc_lru;
           struct pv_entry         pc_pventry[_NPCPV];
   };
   
   /*
    * physmem_desc[] is a superset of phys_avail[] and describes all the
    * memory present in the system.
    *
    * phys_avail[] is similar but does not include the memory stolen by
    * pmap_steal_memory().
    *
    * Each memory region is described by a pair of elements in the array
    * so we can describe up to (PHYS_AVAIL_ENTRIES / 2) distinct memory
    * regions.
    */
   #define PHYS_AVAIL_ENTRIES      10
   extern vm_paddr_t phys_avail[PHYS_AVAIL_ENTRIES + 2];
   extern vm_paddr_t physmem_desc[PHYS_AVAIL_ENTRIES + 2];
   
   extern vm_offset_t virtual_avail;
   extern vm_offset_t virtual_end;
   
   extern vm_paddr_t dump_avail[PHYS_AVAIL_ENTRIES + 2];
   
   #define pmap_page_get_memattr(m)        VM_MEMATTR_DEFAULT
   #define pmap_page_is_mapped(m)  (!TAILQ_EMPTY(&(m)->md.pv_list))
   #define pmap_page_is_write_mapped(m)    (((m)->aflags & PGA_WRITEABLE) != 0)
   
   void pmap_bootstrap(void);
   void *pmap_mapdev(vm_paddr_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_kenter(vm_offset_t va, vm_paddr_t pa);
   void pmap_kenter_attr(vm_offset_t va, vm_paddr_t pa, int attr);
   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);
   void pmap_flush_pvcache(vm_page_t m);
   int pmap_emulate_modified(pmap_t pmap, vm_offset_t va);
   void pmap_page_set_memattr(vm_page_t, vm_memattr_t);
   
   #endif                          /* _KERNEL */
   
   #endif                          /* !LOCORE */
   
   #endif                          /* !_MACHINE_PMAP_H_ */

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