text: /*-
   * Copyright (c) 2003, 2005 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: src/sys/amd64/include/sf_buf.h,v 1.3 2005/02/28 23:38:15 peter Exp $
   */
  
  #ifndef _MACHINE_SF_BUF_H_
  #define _MACHINE_SF_BUF_H_
  
  #include <vm/vm.h>
  #include <vm/vm_param.h>
  #include <vm/vm_page.h>
  
  /*
   * On this machine, the only purpose for which sf_buf is used is to implement
   * an opaque pointer required by the machine-independent parts of the kernel.
   * That pointer references the vm_page that is "mapped" by the sf_buf.  The
   * actual mapping is provided by the direct virtual-to-physical mapping.  
   */
  struct sf_buf;
  
  static __inline vm_offset_t
  sf_buf_kva(struct sf_buf *sf)
  {
  
  	return (PHYS_TO_DMAP(VM_PAGE_TO_PHYS((vm_page_t)sf)));
  }
  
  static __inline vm_page_t
  sf_buf_page(struct sf_buf *sf)
  {
  
  	return ((vm_page_t)sf);
  }
  
  #endif /* !_MACHINE_SF_BUF_H_ */
  