1 /* 2 * Copyright (c) 2003 Alan L. Cox <alc@cs.rice.edu>. All rights reserved. 3 * Copyright (c) 1998 David Greenman. 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 * $DragonFly: src/sys/sys/sfbuf.h,v 1.6 2004/08/24 21:53:41 dillon Exp $ 27 */ 28 29 #ifndef _SFBUF_H_ 30 #define _SFBUF_H_ 31 32 struct sf_buf { 33 LIST_ENTRY(sf_buf) list_entry; /* hash chain of active buffers */ 34 TAILQ_ENTRY(sf_buf) free_entry; /* list of free buffers */ 35 struct vm_page *m; /* currently mapped page */ 36 vm_offset_t kva; /* va of mapping */ 37 int refcnt; /* usage of this mapping */ 38 int flags; /* global SFBA flags */ 39 cpumask_t cpumask; /* cpu mapping synchronization */ 40 }; 41 42 /* 43 * sf_buf_alloc() flags (not all are stored in sf->flags) 44 */ 45 #define SFBA_QUICK 0x0001 /* sync mapping to current cpu only */ 46 #define SFBA_ONFREEQ 0x0002 /* on the free queue (lazy move) */ 47 #define SFBA_PCATCH 0x0004 /* allow interruption */ 48 49 static __inline vm_offset_t 50 sf_buf_kva(struct sf_buf *sf) 51 { 52 return(sf->kva); 53 } 54 55 static __inline struct vm_page * 56 sf_buf_page(struct sf_buf *sf) 57 { 58 return(sf->m); 59 } 60 61 62 #if defined(_KERNEL) 63 64 extern int nsfbufs; 65 66 struct sf_buf *sf_buf_alloc(struct vm_page *, int flags); 67 void sf_buf_free(struct sf_buf *); 68 void sf_buf_ref(struct sf_buf *); 69 70 #endif 71 72 #endif 73