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  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2003 Alan L. Cox <alc@cs.rice.edu>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD: releng/12.0/sys/mips/include/sf_buf.h 326259 2017-11-27 15:07:26Z pfg $
   29  */
   30 
   31 #ifndef _MACHINE_SF_BUF_H_
   32 #define _MACHINE_SF_BUF_H_
   33 
   34 #ifdef __mips_n64       /* In 64 bit the whole memory is directly mapped */
   35 
   36 static inline vm_offset_t
   37 sf_buf_kva(struct sf_buf *sf)
   38 {
   39         vm_page_t       m;
   40 
   41         m = (vm_page_t)sf;
   42         return (MIPS_PHYS_TO_DIRECT(VM_PAGE_TO_PHYS(m)));
   43 }
   44 
   45 static inline struct vm_page *
   46 sf_buf_page(struct sf_buf *sf)
   47 {
   48 
   49         return ((vm_page_t)sf);
   50 }
   51 
   52 #else   /* !__mips_n64 */
   53 
   54 static inline void
   55 sf_buf_map(struct sf_buf *sf, int flags)
   56 {
   57 
   58         pmap_qenter(sf->kva, &sf->m, 1);
   59 }
   60 
   61 static inline int
   62 sf_buf_unmap(struct sf_buf *sf)
   63 {
   64 
   65         pmap_qremove(sf->kva, 1);
   66         return (1);
   67 }
   68 
   69 #endif  /* __mips_n64 */
   70 
   71 #endif /* !_MACHINE_SF_BUF_H_ */

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