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/arm64/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: releng/11.2/sys/arm64/include/sf_buf.h 281494 2015-04-13 14:43:10Z andrew $
   27  */
   28 
   29 #ifndef _MACHINE_SF_BUF_H_
   30 #define _MACHINE_SF_BUF_H_
   31 
   32 /*
   33  * On this machine, the only purpose for which sf_buf is used is to implement
   34  * an opaque pointer required by the machine-independent parts of the kernel.
   35  * That pointer references the vm_page that is "mapped" by the sf_buf.  The
   36  * actual mapping is provided by the direct virtual-to-physical mapping.  
   37  */
   38 static inline vm_offset_t
   39 sf_buf_kva(struct sf_buf *sf)
   40 {
   41 
   42         return (PHYS_TO_DMAP(VM_PAGE_TO_PHYS((vm_page_t)sf)));
   43 }
   44 
   45 static inline vm_page_t
   46 sf_buf_page(struct sf_buf *sf)
   47 {
   48 
   49         return ((vm_page_t)sf);
   50 }
   51 #endif /* !_MACHINE_SF_BUF_H_ */

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