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 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/param.h> 32 #include <sys/conf.h> 33 #include <sys/fcntl.h> 34 #include <sys/kernel.h> 35 #include <sys/lock.h> 36 #include <sys/malloc.h> 37 #include <sys/memrange.h> 38 #include <sys/module.h> 39 #include <sys/mutex.h> 40 #include <sys/proc.h> 41 #include <sys/signalvar.h> 42 #include <sys/systm.h> 43 #include <sys/uio.h> 44 45 #include <vm/vm.h> 46 #include <vm/pmap.h> 47 48 #include <machine/memdev.h> 49 50 static struct cdev *memdev, *kmemdev; 51 52 static struct cdevsw mem_cdevsw = { 53 .d_version = D_VERSION, 54 .d_flags = D_MEM|D_NEEDGIANT, 55 .d_open = memopen, 56 .d_read = memrw, 57 .d_write = memrw, 58 .d_ioctl = memioctl, 59 .d_mmap = memmmap, 60 .d_name = "mem", 61 }; 62 63 /* ARGSUSED */ 64 int 65 memopen(struct cdev *dev __unused, int flags, int fmt __unused, 66 struct thread *td) 67 { 68 int error = 0; 69 70 if (flags & FWRITE) 71 error = securelevel_gt(td->td_ucred, 0); 72 73 return (error); 74 } 75 76 /* ARGSUSED */ 77 static int 78 mem_modevent(module_t mod __unused, int type, void *data __unused) 79 { 80 switch(type) { 81 case MOD_LOAD: 82 if (bootverbose) 83 printf("mem: <memory>\n"); 84 mem_range_init(); 85 memdev = make_dev(&mem_cdevsw, CDEV_MINOR_MEM, 86 UID_ROOT, GID_KMEM, 0640, "mem"); 87 kmemdev = make_dev(&mem_cdevsw, CDEV_MINOR_KMEM, 88 UID_ROOT, GID_KMEM, 0640, "kmem"); 89 break; 90 91 case MOD_UNLOAD: 92 mem_range_destroy(); 93 destroy_dev(memdev); 94 destroy_dev(kmemdev); 95 break; 96 97 case MOD_SHUTDOWN: 98 break; 99 100 default: 101 return(EOPNOTSUPP); 102 103 } 104 105 return (0); 106 } 107 108 DEV_MODULE(mem, mem_modevent, NULL); 109 MODULE_VERSION(mem, 1); 110