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/arm/include/sf_buf.h

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    1 /*-
    2  * Copyright (c) 2003 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 
   33 struct vm_page;
   34 
   35 #ifdef ARM_USE_SMALL_ALLOC
   36 
   37 #include <vm/vm.h>
   38 #include <vm/vm_param.h>
   39 #include <vm/vm_page.h>
   40 
   41 struct sf_buf;
   42 
   43 
   44 static __inline vm_offset_t
   45 sf_buf_kva(struct sf_buf *sf)
   46 {
   47         return arm_ptovirt(VM_PAGE_TO_PHYS((vm_page_t)sf));
   48 }
   49 
   50 static __inline vm_page_t
   51 sf_buf_page(struct sf_buf *sf)
   52 {
   53         return ((vm_page_t)sf);
   54 }
   55 
   56 #else
   57 
   58 #include <sys/queue.h>
   59 
   60 struct sf_buf {
   61         LIST_ENTRY(sf_buf) list_entry;  /* list of buffers */
   62         TAILQ_ENTRY(sf_buf) free_entry; /* list of buffers */
   63         struct          vm_page *m;     /* currently mapped page */
   64         vm_offset_t     kva;            /* va of mapping */
   65         int             ref_count;      /* usage of this mapping */
   66 };
   67 
   68 static __inline vm_offset_t
   69 sf_buf_kva(struct sf_buf *sf)
   70 {
   71 
   72         return (sf->kva);
   73 }
   74 
   75 static __inline struct vm_page *
   76 sf_buf_page(struct sf_buf *sf)
   77 {
   78 
   79         return (sf->m);
   80 }
   81 
   82 #endif
   83 #endif /* !_MACHINE_SF_BUF_H_ */

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