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

     /*-
      * Copyright (c) 2003, 2005 Alan L. Cox <alc@cs.rice.edu>
      * All rights reserved.
      *
      * 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.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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/10.0/sys/i386/include/sf_buf.h 255318 2013-09-06 17:44:13Z glebius $
     */
    
    #ifndef _MACHINE_SF_BUF_H_
    #define _MACHINE_SF_BUF_H_
    
    #include <sys/_cpuset.h>
    #include <sys/queue.h>
    
    struct vm_page;
    
    struct sf_buf {
            LIST_ENTRY(sf_buf) list_entry;  /* list of buffers */
            TAILQ_ENTRY(sf_buf) free_entry; /* list of buffers */
            struct          vm_page *m;     /* currently mapped page */
            vm_offset_t     kva;            /* va of mapping */
            int             ref_count;      /* usage of this mapping */
    #ifdef SMP
            cpuset_t        cpumask;        /* cpus on which mapping is valid */
    #endif
    };
    
    struct sf_buf * sf_buf_alloc(struct vm_page *m, int flags);
    void sf_buf_free(struct sf_buf *sf);
    
    static __inline vm_offset_t
    sf_buf_kva(struct sf_buf *sf)
    {
    
            return (sf->kva);
    }
    
    static __inline struct vm_page *
    sf_buf_page(struct sf_buf *sf)
    {
    
            return (sf->m);
    }
    
    boolean_t sf_buf_invalidate_cache(vm_page_t m);
    
    #endif /* !_MACHINE_SF_BUF_H_ */

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