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.
     *
     * $FreeBSD$
     */
    
    #ifndef _MACHINE_SF_BUF_H_
    #define _MACHINE_SF_BUF_H_
    
    #ifdef __mips_n64
    #include <vm/vm.h>
    #include <vm/vm_param.h>
    #include <vm/vm_page.h>
    #else
    #include <sys/queue.h>
    #endif
    
    #ifdef __mips_n64
    /* In 64 bit the whole memory is directly mapped */
    struct  sf_buf;
    
    static inline struct sf_buf *
    sf_buf_alloc(struct vm_page *m, int pri)
    {
    
            return ((struct sf_buf *)m);
    }
    
    static inline void
    sf_buf_free(struct sf_buf *sf)
    {
    }
    
    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 */
    struct vm_page;
    
    struct sf_buf {
            SLIST_ENTRY(sf_buf) free_list;  /* list of free buffer slots */
            struct          vm_page *m;     /* currently mapped page */
            vm_offset_t     kva;            /* va of mapping */
    };
    
    struct sf_buf * sf_buf_alloc(struct vm_page *m, int flags);
    void sf_buf_free(struct sf_buf *sf);
    
    static __inline vm_offset_t
    sf_buf_kva(struct sf_buf *sf)
    {
    
            return (sf->kva);
    }
    
    static __inline struct vm_page *
    sf_buf_page(struct sf_buf *sf)
    {
    
            return (sf->m);
    }
    #endif /* __mips_n64 */
    
    #endif /* !_MACHINE_SF_BUF_H_ */

Cache object: 47dc538dd19f2b051e72dc6c119c702a