The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Copyright (c) 2003, 2005 Alan L. Cox <alc@cs.rice.edu>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD$
   27  */
   28 
   29 #ifndef _MACHINE_SF_BUF_H_
   30 #define _MACHINE_SF_BUF_H_
   31 
   32 #include <sys/queue.h>
   33 
   34 struct vm_page;
   35 
   36 struct sf_buf {
   37         LIST_ENTRY(sf_buf) list_entry;  /* list of buffers */
   38         TAILQ_ENTRY(sf_buf) free_entry; /* list of buffers */
   39         struct          vm_page *m;     /* currently mapped page */
   40         vm_offset_t     kva;            /* va of mapping */
   41         int             ref_count;      /* usage of this mapping */
   42 #ifdef SMP
   43         cpumask_t       cpumask;        /* cpus on which mapping is valid */
   44 #endif
   45 };
   46 
   47 static __inline vm_offset_t
   48 sf_buf_kva(struct sf_buf *sf)
   49 {
   50 
   51         return (sf->kva);
   52 }
   53 
   54 static __inline struct vm_page *
   55 sf_buf_page(struct sf_buf *sf)
   56 {
   57 
   58         return (sf->m);
   59 }
   60 
   61 #endif /* !_MACHINE_SF_BUF_H_ */

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