1/* 2 * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28/*- 29 * Copyright (c) 1988 University of Utah. 30 * Copyright (c) 1982, 1986, 1990, 1993 31 * The Regents of the University of California. All rights reserved. 32 * 33 * This code is derived from software contributed to Berkeley by 34 * the Systems Programming Group of the University of Utah Computer 35 * Science Department, and code derived from software contributed to 36 * Berkeley by William Jolitz. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. All advertising materials mentioning features or use of this software 47 * must display the following acknowledgement: 48 * This product includes software developed by the University of 49 * California, Berkeley and its contributors. 50 * 4. Neither the name of the University nor the names of its contributors 51 * may be used to endorse or promote products derived from this software 52 * without specific prior written permission. 53 * 54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 64 * SUCH DAMAGE. 65 * 66 * from: Utah $Hdr: mem.c 1.13 89/10/08$ 67 * @(#)mem.c 8.1 (Berkeley) 6/11/93 68 */ 69 70#include <mach_load.h> 71 72/* 73 * Memory special file 74 */ 75 76#include <sys/param.h> 77#include <sys/dir.h> 78#include <sys/proc.h> 79#include <sys/systm.h> 80#include <sys/conf.h> 81#include <sys/vm.h> 82#include <sys/uio_internal.h> 83#include <sys/malloc.h> 84 85#include <mach/vm_types.h> 86#include <mach/vm_param.h> 87#include <vm/vm_kern.h> /* for kernel_map */ 88 89extern addr64_t kvtophys(vm_offset_t va); 90extern boolean_t kernacc(off_t, size_t ); 91#if !defined(SECURE_KERNEL) 92extern int setup_kmem; 93#endif 94 95static caddr_t devzerobuf; 96 97int mmread(dev_t dev, struct uio *uio); 98int mmwrite(dev_t dev, struct uio *uio); 99int mmioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p); 100int mmrw(dev_t dev, struct uio *uio, enum uio_rw rw); 101 102int 103mmread(dev_t dev, struct uio *uio) 104{ 105 106 return (mmrw(dev, uio, UIO_READ)); 107} 108 109int 110mmwrite(dev_t dev, struct uio *uio) 111{ 112 113 return (mmrw(dev, uio, UIO_WRITE)); 114} 115 116int 117mmioctl(dev_t dev, u_long cmd, __unused caddr_t data, 118 __unused int flag, __unused struct proc *p) 119{ 120 int minnum = minor(dev); 121 122 if (0 == minnum || 1 == minnum) { 123 /* /dev/mem and /dev/kmem */ 124#if defined(SECURE_KERNEL) 125 return (ENODEV); 126#else 127 if (0 == setup_kmem) 128 return (EINVAL); 129#endif 130 } 131 132 switch (cmd) { 133 case FIONBIO: 134 case FIOASYNC: 135 /* OK to do nothing: we always return immediately */ 136 break; 137 default: 138 return ENODEV; 139 } 140 141 return (0); 142} 143 144int 145mmrw(dev_t dev, struct uio *uio, enum uio_rw rw) 146{ 147 register int o; 148 register u_int c, v; 149 int error = 0; 150 vm_offset_t where; 151 vm_size_t size; 152 153 154 while (uio_resid(uio) > 0 && error == 0) { 155 uio_update(uio, 0); 156 157 switch (minor(dev)) { 158 159 /* minor device 0 is physical memory */ 160 case 0: 161#if defined(SECURE_KERNEL) 162 return(ENODEV); 163#else 164 if (setup_kmem == 0) 165 return(ENODEV); 166#endif 167 168 v = trunc_page(uio->uio_offset); 169 if (uio->uio_offset >= (off_t)mem_size) 170 goto fault; 171 172 size= PAGE_SIZE; 173 if (kmem_alloc(kernel_map, &where, size) 174 != KERN_SUCCESS) { 175 goto fault; 176 } 177 o = uio->uio_offset - v; 178 c = min(PAGE_SIZE - o, uio_curriovlen(uio)); 179 error = uiomove((caddr_t) (where + o), c, uio); 180 kmem_free(kernel_map, where, PAGE_SIZE); 181 continue; 182 183 /* minor device 1 is kernel memory */ 184 case 1: 185#if defined(SECURE_KERNEL) 186 return(ENODEV); 187#else 188 if (setup_kmem == 0) 189 return(ENODEV); 190#endif 191 /* Do some sanity checking */ 192 if (((vm_address_t)uio->uio_offset >= VM_MAX_KERNEL_ADDRESS) || 193 ((vm_address_t)uio->uio_offset <= VM_MIN_KERNEL_AND_KEXT_ADDRESS)) 194 goto fault; 195 c = uio_curriovlen(uio); 196 if (!kernacc(uio->uio_offset, c)) 197 goto fault; 198 error = uiomove((caddr_t)(uintptr_t)uio->uio_offset, 199 (int)c, uio); 200 continue; 201 202 /* minor device 2 is EOF/RATHOLE */ 203 case 2: 204 if (rw == UIO_READ) 205 return (0); 206 c = uio_curriovlen(uio); 207 break; 208 case 3: 209 if(devzerobuf == NULL) { 210 MALLOC(devzerobuf, caddr_t,PAGE_SIZE, M_TEMP, M_WAITOK); 211 bzero(devzerobuf, PAGE_SIZE); 212 } 213 if(uio->uio_rw == UIO_WRITE) { 214 c = uio_curriovlen(uio); 215 break; 216 } 217 c = min(uio_curriovlen(uio), PAGE_SIZE); 218 error = uiomove(devzerobuf, (int)c, uio); 219 continue; 220 default: 221 goto fault; 222 break; 223 } 224 225 if (error) 226 break; 227 uio_update(uio, c); 228 } 229 return (error); 230fault: 231 return (EFAULT); 232} 233 234 235boolean_t 236kernacc( 237 off_t start, 238 size_t len 239) 240{ 241 off_t base; 242 off_t end; 243 244 base = trunc_page(start); 245 end = start + len; 246 247 while (base < end) { 248 if(kvtophys((vm_offset_t)base) == 0ULL) 249 return(FALSE); 250 base += page_size; 251 } 252 253 return (TRUE); 254} 255