FreeBSD/Linux Kernel Cross Reference
sys/mips/include/sf_buf.h

     /*-
      * Copyright (c) 2003 Alan L. Cox <alc@cs.rice.edu>
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD: releng/11.2/sys/mips/include/sf_buf.h 331722 2018-03-29 02:50:57Z eadler $
     */
    
    #ifndef _MACHINE_SF_BUF_H_
    #define _MACHINE_SF_BUF_H_
    
    #ifdef __mips_n64       /* In 64 bit the whole memory is directly mapped */
    
    static inline vm_offset_t
    sf_buf_kva(struct sf_buf *sf)
    {
            vm_page_t       m;
    
            m = (vm_page_t)sf;
            return (MIPS_PHYS_TO_DIRECT(VM_PAGE_TO_PHYS(m)));
    }
    
    static inline struct vm_page *
    sf_buf_page(struct sf_buf *sf)
    {
    
            return ((vm_page_t)sf);
    }
    
    #else   /* !__mips_n64 */
    
    static inline void
    sf_buf_map(struct sf_buf *sf, int flags)
    {
    
            pmap_qenter(sf->kva, &sf->m, 1);
    }
    
    static inline int
    sf_buf_unmap(struct sf_buf *sf)
    {
    
            pmap_qremove(sf->kva, 1);
            return (1);
    }
    
    #endif  /* __mips_n64 */
    
    #endif /* !_MACHINE_SF_BUF_H_ */

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