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/10.3/sys/mips/include/sf_buf.h 255318 2013-09-06 17:44:13Z glebius $
   27  */
   28 
   29 #ifndef _MACHINE_SF_BUF_H_
   30 #define _MACHINE_SF_BUF_H_
   31 
   32 #ifdef __mips_n64
   33 #include <vm/vm.h>
   34 #include <vm/vm_param.h>
   35 #include <vm/vm_page.h>
   36 #else
   37 #include <sys/queue.h>
   38 #endif
   39 
   40 #ifdef __mips_n64
   41 /* In 64 bit the whole memory is directly mapped */
   42 struct  sf_buf;
   43 
   44 static inline struct sf_buf *
   45 sf_buf_alloc(struct vm_page *m, int pri)
   46 {
   47 
   48         return ((struct sf_buf *)m);
   49 }
   50 
   51 static inline void
   52 sf_buf_free(struct sf_buf *sf)
   53 {
   54 }
   55 
   56 static __inline vm_offset_t
   57 sf_buf_kva(struct sf_buf *sf)
   58 {
   59         vm_page_t       m;
   60 
   61         m = (vm_page_t)sf;
   62         return (MIPS_PHYS_TO_DIRECT(VM_PAGE_TO_PHYS(m)));
   63 }
   64 
   65 static __inline struct vm_page *
   66 sf_buf_page(struct sf_buf *sf)
   67 {
   68 
   69         return ((vm_page_t)sf);
   70 }
   71 
   72 #else /* ! __mips_n64 */
   73 struct vm_page;
   74 
   75 struct sf_buf {
   76         SLIST_ENTRY(sf_buf) free_list;  /* list of free buffer slots */
   77         struct          vm_page *m;     /* currently mapped page */
   78         vm_offset_t     kva;            /* va of mapping */
   79 };
   80 
   81 struct sf_buf * sf_buf_alloc(struct vm_page *m, int flags);
   82 void sf_buf_free(struct sf_buf *sf);
   83 
   84 static __inline vm_offset_t
   85 sf_buf_kva(struct sf_buf *sf)
   86 {
   87 
   88         return (sf->kva);
   89 }
   90 
   91 static __inline struct vm_page *
   92 sf_buf_page(struct sf_buf *sf)
   93 {
   94 
   95         return (sf->m);
   96 }
   97 #endif /* __mips_n64 */
   98 
   99 #endif /* !_MACHINE_SF_BUF_H_ */

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