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 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/param.h> 34 #include <sys/conf.h> 35 #include <sys/fcntl.h> 36 #include <sys/kernel.h> 37 #include <sys/lock.h> 38 #include <sys/malloc.h> 39 #include <sys/memrange.h> 40 #include <sys/module.h> 41 #include <sys/mutex.h> 42 #include <sys/priv.h> 43 #include <sys/proc.h> 44 #include <sys/signalvar.h> 45 #include <sys/systm.h> 46 #include <sys/uio.h> 47 48 #include <vm/vm.h> 49 #include <vm/pmap.h> 50 51 #include <machine/memdev.h> 52 53 static struct cdev *memdev, *kmemdev; 54 55 static struct cdevsw mem_cdevsw = { 56 .d_version = D_VERSION, 57 .d_flags = D_MEM, 58 .d_open = memopen, 59 .d_read = memrw, 60 .d_write = memrw, 61 .d_ioctl = memioctl, 62 .d_mmap = memmmap, 63 .d_name = "mem", 64 }; 65 66 /* ARGSUSED */ 67 int 68 memopen(struct cdev *dev __unused, int flags, int fmt __unused, 69 struct thread *td) 70 { 71 int error = 0; 72 73 if (flags & FREAD) 74 error = priv_check(td, PRIV_KMEM_READ); 75 if (flags & FWRITE) { 76 if (error == 0) 77 error = priv_check(td, PRIV_KMEM_WRITE); 78 if (error == 0) 79 error = securelevel_gt(td->td_ucred, 0); 80 } 81 82 return (error); 83 } 84 85 /* ARGSUSED */ 86 static int 87 mem_modevent(module_t mod __unused, int type, void *data __unused) 88 { 89 switch(type) { 90 case MOD_LOAD: 91 if (bootverbose) 92 printf("mem: <memory>\n"); 93 mem_range_init(); 94 memdev = make_dev(&mem_cdevsw, CDEV_MINOR_MEM, 95 UID_ROOT, GID_KMEM, 0640, "mem"); 96 kmemdev = make_dev(&mem_cdevsw, CDEV_MINOR_KMEM, 97 UID_ROOT, GID_KMEM, 0640, "kmem"); 98 break; 99 100 case MOD_UNLOAD: 101 mem_range_destroy(); 102 destroy_dev(memdev); 103 destroy_dev(kmemdev); 104 break; 105 106 case MOD_SHUTDOWN: 107 break; 108 109 default: 110 return(EOPNOTSUPP); 111 112 } 113 114 return (0); 115 } 116 117 DEV_MODULE(mem, mem_modevent, NULL); 118 MODULE_VERSION(mem, 1); 119