sf_buf.h revision 128393
1122780Salc/*- 2122780Salc * Copyright (c) 2003 Alan L. Cox <alc@cs.rice.edu> 3122780Salc * All rights reserved. 4122780Salc * 5122780Salc * Redistribution and use in source and binary forms, with or without 6122780Salc * modification, are permitted provided that the following conditions 7122780Salc * are met: 8122780Salc * 1. Redistributions of source code must retain the above copyright 9122780Salc * notice, this list of conditions and the following disclaimer. 10122780Salc * 2. Redistributions in binary form must reproduce the above copyright 11122780Salc * notice, this list of conditions and the following disclaimer in the 12122780Salc * documentation and/or other materials provided with the distribution. 13122780Salc * 14122780Salc * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15122780Salc * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16122780Salc * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17122780Salc * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18122780Salc * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19122780Salc * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20122780Salc * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21122780Salc * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22122780Salc * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23122780Salc * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24122780Salc * SUCH DAMAGE. 25122780Salc * 26122780Salc * $FreeBSD: head/sys/ia64/include/sf_buf.h 128393 2004-04-18 07:11:12Z alc $ 27122780Salc */ 28122780Salc 29122780Salc#ifndef _MACHINE_SF_BUF_H_ 30122780Salc#define _MACHINE_SF_BUF_H_ 31122780Salc 32122780Salc#include <vm/vm.h> 33122780Salc#include <vm/vm_param.h> 34122780Salc#include <vm/vm_page.h> 35122780Salc 36128393Salc/* 37128393Salc * On this machine, the only purpose for which sf_buf is used is to implement 38128393Salc * an opaque pointer required by the machine-independent parts of the kernel. 39128393Salc * That pointer references the vm_page that is "mapped" by the sf_buf. The 40128393Salc * actual mapping is provided by the direct virtual-to-physical mapping. 41128393Salc */ 42128393Salcstruct sf_buf; 43122780Salc 44122780Salcstatic __inline vm_offset_t 45122780Salcsf_buf_kva(struct sf_buf *sf) 46122780Salc{ 47122780Salc 48128393Salc return (IA64_PHYS_TO_RR7(VM_PAGE_TO_PHYS((vm_page_t)sf))); 49122780Salc} 50122780Salc 51122780Salcstatic __inline vm_page_t 52122780Salcsf_buf_page(struct sf_buf *sf) 53122780Salc{ 54122780Salc 55128393Salc return ((vm_page_t)sf); 56122780Salc} 57122780Salc 58122780Salc#endif /* !_MACHINE_SF_BUF_H_ */ 59