1 /*- 2 * Copyright (c) 2003, 2005 Alan L. Cox <alc@cs.rice.edu> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 #ifndef _MACHINE_SF_BUF_H_ 30 #define _MACHINE_SF_BUF_H_ 31 32 /* 33 * On this machine, the only purpose for which sf_buf is used is to implement 34 * an opaque pointer required by the machine-independent parts of the kernel. 35 * That pointer references the vm_page that is "mapped" by the sf_buf. The 36 * actual mapping is provided by the direct virtual-to-physical mapping. 37 */ 38 static inline vm_offset_t 39 sf_buf_kva(struct sf_buf *sf) 40 { 41 42 return (PHYS_TO_DMAP(VM_PAGE_TO_PHYS((vm_page_t)sf))); 43 } 44 45 static inline vm_page_t 46 sf_buf_page(struct sf_buf *sf) 47 { 48 49 return ((vm_page_t)sf); 50 } 51 #endif /* !_MACHINE_SF_BUF_H_ */ 52