1 /*- 2 * Copyright (c) 2004 Mark R V Murray 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 * in this position and unchanged. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/kernel.h> 32 #include <sys/lock.h> 33 #include <sys/malloc.h> 34 #include <sys/memrange.h> 35 #include <sys/rwlock.h> 36 #include <sys/systm.h> 37 38 static struct rwlock mr_lock; 39 40 /* 41 * Implementation-neutral, kernel-callable functions for manipulating 42 * memory range attributes. 43 */ 44 void 45 mem_range_init(void) 46 { 47 48 if (mem_range_softc.mr_op == NULL) 49 return; 50 rw_init(&mr_lock, "memrange"); 51 mem_range_softc.mr_op->init(&mem_range_softc); 52 } 53 54 void 55 mem_range_destroy(void) 56 { 57 58 if (mem_range_softc.mr_op == NULL) 59 return; 60 rw_destroy(&mr_lock); 61 } 62 63 int 64 mem_range_attr_get(struct mem_range_desc *mrd, int *arg) 65 { 66 int nd; 67 68 if (mem_range_softc.mr_op == NULL) 69 return (EOPNOTSUPP); 70 nd = *arg; 71 rw_rlock(&mr_lock); 72 if (nd == 0) 73 *arg = mem_range_softc.mr_ndesc; 74 else 75 bcopy(mem_range_softc.mr_desc, mrd, nd * sizeof(*mrd)); 76 rw_runlock(&mr_lock); 77 return (0); 78 } 79 80 int 81 mem_range_attr_set(struct mem_range_desc *mrd, int *arg) 82 { 83 int ret; 84 85 if (mem_range_softc.mr_op == NULL) 86 return (EOPNOTSUPP); 87 rw_wlock(&mr_lock); 88 ret = mem_range_softc.mr_op->set(&mem_range_softc, mrd, arg); 89 rw_wunlock(&mr_lock); 90 return (ret); 91 } 92