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/mips/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: releng/11.0/sys/mips/include/sf_buf.h 271217 2014-09-07 05:47:48Z glebius $
   27  */
   28 
   29 #ifndef _MACHINE_SF_BUF_H_
   30 #define _MACHINE_SF_BUF_H_
   31 
   32 #ifdef __mips_n64       /* In 64 bit the whole memory is directly mapped */
   33 
   34 static inline vm_offset_t
   35 sf_buf_kva(struct sf_buf *sf)
   36 {
   37         vm_page_t       m;
   38 
   39         m = (vm_page_t)sf;
   40         return (MIPS_PHYS_TO_DIRECT(VM_PAGE_TO_PHYS(m)));
   41 }
   42 
   43 static inline struct vm_page *
   44 sf_buf_page(struct sf_buf *sf)
   45 {
   46 
   47         return ((vm_page_t)sf);
   48 }
   49 
   50 #else   /* !__mips_n64 */
   51 
   52 static inline void
   53 sf_buf_map(struct sf_buf *sf, int flags)
   54 {
   55 
   56         pmap_qenter(sf->kva, &sf->m, 1);
   57 }
   58 
   59 static inline int
   60 sf_buf_unmap(struct sf_buf *sf)
   61 {
   62 
   63         pmap_qremove(sf->kva, 1);
   64         return (1);
   65 }
   66 
   67 #endif  /* __mips_n64 */
   68 
   69 #endif /* !_MACHINE_SF_BUF_H_ */

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