1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2004 Mark R V Murray 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer 12 * in this position and unchanged. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/kernel.h> 34 #include <sys/lock.h> 35 #include <sys/malloc.h> 36 #include <sys/memrange.h> 37 #include <sys/rwlock.h> 38 #include <sys/systm.h> 39 40 static struct rwlock mr_lock; 41 42 /* 43 * Implementation-neutral, kernel-callable functions for manipulating 44 * memory range attributes. 45 */ 46 void 47 mem_range_init(void) 48 { 49 50 if (mem_range_softc.mr_op == NULL) 51 return; 52 rw_init(&mr_lock, "memrange"); 53 mem_range_softc.mr_op->init(&mem_range_softc); 54 } 55 56 void 57 mem_range_destroy(void) 58 { 59 60 if (mem_range_softc.mr_op == NULL) 61 return; 62 rw_destroy(&mr_lock); 63 } 64 65 int 66 mem_range_attr_get(struct mem_range_desc *mrd, int *arg) 67 { 68 int nd; 69 70 if (mem_range_softc.mr_op == NULL) 71 return (EOPNOTSUPP); 72 nd = *arg; 73 rw_rlock(&mr_lock); 74 if (nd == 0) 75 *arg = mem_range_softc.mr_ndesc; 76 else 77 bcopy(mem_range_softc.mr_desc, mrd, nd * sizeof(*mrd)); 78 rw_runlock(&mr_lock); 79 return (0); 80 } 81 82 int 83 mem_range_attr_set(struct mem_range_desc *mrd, int *arg) 84 { 85 int ret; 86 87 if (mem_range_softc.mr_op == NULL) 88 return (EOPNOTSUPP); 89 rw_wlock(&mr_lock); 90 ret = mem_range_softc.mr_op->set(&mem_range_softc, mrd, arg); 91 rw_wunlock(&mr_lock); 92 return (ret); 93 } 94