/* * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /*- * Copyright (c) 1988 University of Utah. * Copyright (c) 1982, 1986, 1990, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * the Systems Programming Group of the University of Utah Computer * Science Department, and code derived from software contributed to * Berkeley by William Jolitz. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * from: Utah $Hdr: mem.c 1.13 89/10/08$ * @(#)mem.c 8.1 (Berkeley) 6/11/93 */ #include /* * Memory special file */ #include #include #include #include #include #include #include #include #include #include #include /* for kernel_map */ extern addr64_t kvtophys(vm_offset_t va); extern boolean_t kernacc(off_t, size_t ); #if !defined(SECURE_KERNEL) extern int setup_kmem; #endif static caddr_t devzerobuf; int mmread(dev_t dev, struct uio *uio); int mmwrite(dev_t dev, struct uio *uio); int mmioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p); int mmrw(dev_t dev, struct uio *uio, enum uio_rw rw); int mmread(dev_t dev, struct uio *uio) { return (mmrw(dev, uio, UIO_READ)); } int mmwrite(dev_t dev, struct uio *uio) { return (mmrw(dev, uio, UIO_WRITE)); } int mmioctl(dev_t dev, u_long cmd, __unused caddr_t data, __unused int flag, __unused struct proc *p) { int minnum = minor(dev); if (0 == minnum || 1 == minnum) { /* /dev/mem and /dev/kmem */ #if defined(SECURE_KERNEL) return (ENODEV); #else if (0 == setup_kmem) return (EINVAL); #endif } switch (cmd) { case FIONBIO: case FIOASYNC: /* OK to do nothing: we always return immediately */ break; default: return ENODEV; } return (0); } int mmrw(dev_t dev, struct uio *uio, enum uio_rw rw) { register int o; register u_int c, v; int error = 0; vm_offset_t where; vm_size_t size; while (uio_resid(uio) > 0 && error == 0) { uio_update(uio, 0); switch (minor(dev)) { /* minor device 0 is physical memory */ case 0: #if defined(SECURE_KERNEL) return(ENODEV); #else if (setup_kmem == 0) return(ENODEV); #endif v = trunc_page(uio->uio_offset); if (uio->uio_offset >= (off_t)mem_size) goto fault; size= PAGE_SIZE; if (kmem_alloc(kernel_map, &where, size) != KERN_SUCCESS) { goto fault; } o = uio->uio_offset - v; c = min(PAGE_SIZE - o, uio_curriovlen(uio)); error = uiomove((caddr_t) (where + o), c, uio); kmem_free(kernel_map, where, PAGE_SIZE); continue; /* minor device 1 is kernel memory */ case 1: #if defined(SECURE_KERNEL) return(ENODEV); #else if (setup_kmem == 0) return(ENODEV); #endif /* Do some sanity checking */ if (((vm_address_t)uio->uio_offset >= VM_MAX_KERNEL_ADDRESS) || ((vm_address_t)uio->uio_offset <= VM_MIN_KERNEL_AND_KEXT_ADDRESS)) goto fault; c = uio_curriovlen(uio); if (!kernacc(uio->uio_offset, c)) goto fault; error = uiomove((caddr_t)(uintptr_t)uio->uio_offset, (int)c, uio); continue; /* minor device 2 is EOF/RATHOLE */ case 2: if (rw == UIO_READ) return (0); c = uio_curriovlen(uio); break; case 3: if(devzerobuf == NULL) { MALLOC(devzerobuf, caddr_t,PAGE_SIZE, M_TEMP, M_WAITOK); bzero(devzerobuf, PAGE_SIZE); } if(uio->uio_rw == UIO_WRITE) { c = uio_curriovlen(uio); break; } c = min(uio_curriovlen(uio), PAGE_SIZE); error = uiomove(devzerobuf, (int)c, uio); continue; default: goto fault; break; } if (error) break; uio_update(uio, c); } return (error); fault: return (EFAULT); } boolean_t kernacc( off_t start, size_t len ) { off_t base; off_t end; base = trunc_page(start); end = start + len; while (base < end) { if(kvtophys((vm_offset_t)base) == 0ULL) return(FALSE); base += page_size; } return (TRUE); }