+++ /dev/null
-/*
- * 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 <mach_load.h>
-
-/*
- * Memory special file
- */
-
-#include <sys/param.h>
-#include <sys/dir.h>
-#include <sys/proc.h>
-#include <sys/systm.h>
-#include <sys/conf.h>
-#include <sys/vm.h>
-#include <sys/uio_internal.h>
-#include <sys/malloc.h>
-
-#include <mach/vm_types.h>
-#include <mach/vm_param.h>
-#include <vm/vm_kern.h> /* 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);
-}
projects / apple / xnu.git / blobdiff