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 #include <sys/_cpuset.h> 33 #include <sys/queue.h> 34 35 struct vm_page; 36 37 struct sf_buf { 38 LIST_ENTRY(sf_buf) list_entry; /* list of buffers */ 39 TAILQ_ENTRY(sf_buf) free_entry; /* list of buffers */ 40 struct vm_page *m; /* currently mapped page */ 41 vm_offset_t kva; /* va of mapping */ 42 int ref_count; /* usage of this mapping */ 43 #ifdef SMP 44 cpuset_t cpumask; /* cpus on which mapping is valid */ 45 #endif 46 }; 47 48 struct sf_buf * sf_buf_alloc(struct vm_page *m, int flags); 49 void sf_buf_free(struct sf_buf *sf); 50 51 static __inline vm_offset_t 52 sf_buf_kva(struct sf_buf *sf) 53 { 54 55 return (sf->kva); 56 } 57 58 static __inline struct vm_page * 59 sf_buf_page(struct sf_buf *sf) 60 { 61 62 return (sf->m); 63 } 64 65 boolean_t sf_buf_invalidate_cache(vm_page_t m); 66 67 #endif /* !_MACHINE_SF_BUF_H_ */ 68