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/priv.h> 41 #include <sys/proc.h> 42 #include <sys/signalvar.h> 43 #include <sys/systm.h> 44 #include <sys/uio.h> 45 46 #include <vm/vm.h> 47 #include <vm/pmap.h> 48 49 #include <machine/memdev.h> 50 51 static struct cdev *memdev, *kmemdev; 52 53 static struct cdevsw mem_cdevsw = { 54 .d_version = D_VERSION, 55 .d_flags = D_MEM, 56 .d_open = memopen, 57 .d_read = memrw, 58 .d_write = memrw, 59 .d_ioctl = memioctl, 60 .d_mmap = memmmap, 61 .d_name = "mem", 62 }; 63 64 /* ARGSUSED */ 65 int 66 memopen(struct cdev *dev __unused, int flags, int fmt __unused, 67 struct thread *td) 68 { 69 int error = 0; 70 71 if (flags & FREAD) 72 error = priv_check(td, PRIV_KMEM_READ); 73 if (flags & FWRITE) { 74 if (error == 0) 75 error = priv_check(td, PRIV_KMEM_WRITE); 76 if (error == 0) 77 error = securelevel_gt(td->td_ucred, 0); 78 } 79 80 return (error); 81 } 82 83 /* ARGSUSED */ 84 static int 85 mem_modevent(module_t mod __unused, int type, void *data __unused) 86 { 87 switch(type) { 88 case MOD_LOAD: 89 if (bootverbose) 90 printf("mem: <memory>\n"); 91 mem_range_init(); 92 memdev = make_dev(&mem_cdevsw, CDEV_MINOR_MEM, 93 UID_ROOT, GID_KMEM, 0640, "mem"); 94 kmemdev = make_dev(&mem_cdevsw, CDEV_MINOR_KMEM, 95 UID_ROOT, GID_KMEM, 0640, "kmem"); 96 break; 97 98 case MOD_UNLOAD: 99 mem_range_destroy(); 100 destroy_dev(memdev); 101 destroy_dev(kmemdev); 102 break; 103 104 case MOD_SHUTDOWN: 105 break; 106 107 default: 108 return(EOPNOTSUPP); 109 110 } 111 112 return (0); 113 } 114 115 DEV_MODULE(mem, mem_modevent, NULL); 116 MODULE_VERSION(mem, 1); 117