FreeBSD/Linux Kernel Cross Reference
sys/arm64/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. 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.
     *
     * $FreeBSD: releng/11.2/sys/arm64/include/pmap.h 305882 2016-09-16 12:36:11Z andrew $
     */
    
    #ifndef _MACHINE_PMAP_H_
    #define _MACHINE_PMAP_H_
    
    #include <machine/pte.h>
    
    #ifndef LOCORE
    
    #include <sys/queue.h>
    #include <sys/_lock.h>
    #include <sys/_mutex.h>
    
    #include <vm/_vm_radix.h>
    
    #ifdef _KERNEL
    
    #define vtophys(va)     pmap_kextract((vm_offset_t)(va))
    
    #endif
    
    #define pmap_page_get_memattr(m)        ((m)->md.pv_memattr)
    #define pmap_page_is_write_mapped(m)    (((m)->aflags & PGA_WRITEABLE) != 0)
    void pmap_page_set_memattr(vm_page_t m, vm_memattr_t ma);
    
    /*
     * Pmap stuff
     */
    
    struct md_page {
            TAILQ_HEAD(,pv_entry)   pv_list;
            int                     pv_gen;
            vm_memattr_t            pv_memattr;
    };
    
    /*
     * This structure is used to hold a virtual<->physical address
     * association and is used mostly by bootstrap code
     */
    struct pv_addr {
            SLIST_ENTRY(pv_addr) pv_list;
            vm_offset_t     pv_va;
            vm_paddr_t      pv_pa;
    };
    
    
    struct pmap {
            struct mtx              pm_mtx;
            struct pmap_statistics  pm_stats;       /* pmap statictics */
            pd_entry_t              *pm_l0;
            TAILQ_HEAD(,pv_chunk)   pm_pvchunk;     /* list of mappings in pmap */
            struct vm_radix         pm_root;        /* spare page table pages */
    };
    
    typedef struct pv_entry {
            vm_offset_t             pv_va;  /* virtual address for mapping */
            TAILQ_ENTRY(pv_entry)   pv_next;
    } *pv_entry_t;
    
    /*
     * pv_entries are allocated in chunks per-process.  This avoids the
     * need to track per-pmap assignments.
     */
    #define _NPCM   3
    #define _NPCPV  168
    struct pv_chunk {
           struct pmap *           pc_pmap;
           TAILQ_ENTRY(pv_chunk)   pc_list;
           uint64_t                pc_map[_NPCM];  /* bitmap; 1 = free */
           TAILQ_ENTRY(pv_chunk)   pc_lru;
           struct pv_entry         pc_pventry[_NPCPV];
   };
   
   typedef struct pmap *pmap_t;
   
   #ifdef _KERNEL
   extern struct pmap      kernel_pmap_store;
   #define kernel_pmap     (&kernel_pmap_store)
   #define pmap_kernel()   kernel_pmap
   
   #define PMAP_ASSERT_LOCKED(pmap) \
                                   mtx_assert(&(pmap)->pm_mtx, MA_OWNED)
   #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 | MTX_DUPOK)
   #define PMAP_OWNED(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 PHYS_AVAIL_SIZE 32
   extern vm_paddr_t phys_avail[];
   extern vm_paddr_t dump_avail[];
   extern vm_offset_t virtual_avail;
   extern vm_offset_t virtual_end;
   
   /*
    * Macros to test if a mapping is mappable with an L1 Section mapping
    * or an L2 Large Page mapping.
    */
   #define L1_MAPPABLE_P(va, pa, size)                                     \
           ((((va) | (pa)) & L1_OFFSET) == 0 && (size) >= L1_SIZE)
   
   void    pmap_bootstrap(vm_offset_t, vm_offset_t, vm_paddr_t, vm_size_t);
   void    pmap_kenter_device(vm_offset_t, vm_size_t, vm_paddr_t);
   vm_paddr_t pmap_kextract(vm_offset_t va);
   void    pmap_kremove(vm_offset_t);
   void    pmap_kremove_device(vm_offset_t, vm_size_t);
   
   void    *pmap_mapdev(vm_offset_t, vm_size_t);
   void    *pmap_mapbios(vm_paddr_t, vm_size_t);
   void    pmap_unmapdev(vm_offset_t, vm_size_t);
   void    pmap_unmapbios(vm_offset_t, vm_size_t);
   
   boolean_t pmap_map_io_transient(vm_page_t *, vm_offset_t *, int, boolean_t);
   void    pmap_unmap_io_transient(vm_page_t *, vm_offset_t *, int, boolean_t);
   
   bool    pmap_get_tables(pmap_t, vm_offset_t, pd_entry_t **, pd_entry_t **,
       pd_entry_t **, pt_entry_t **);
   
   int     pmap_fault(pmap_t, uint64_t, uint64_t);
   
   #define pmap_page_is_mapped(m)  (!TAILQ_EMPTY(&(m)->md.pv_list))
   
   #endif  /* _KERNEL */
   
   #endif  /* !LOCORE */
   
   #endif  /* !_MACHINE_PMAP_H_ */

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