2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1988 University of Utah.
5 * Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
8 * This code is derived from software contributed to Berkeley by
9 * the Systems Programming Group of the University of Utah Computer
10 * Science Department, and code derived from software contributed to
11 * Berkeley by William Jolitz.
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * from: Utah $Hdr: mem.c 1.13 89/10/08$
38 * from: @(#)mem.c 7.2 (Berkeley) 5/9/91
41 #include <sys/cdefs.h>
42 __FBSDID("$FreeBSD$");
48 #include <sys/param.h>
50 #include <sys/fcntl.h>
51 #include <sys/kernel.h>
53 #include <sys/malloc.h>
54 #include <sys/memrange.h>
55 #include <sys/module.h>
56 #include <sys/mutex.h>
58 #include <sys/msgbuf.h>
59 #include <sys/systm.h>
60 #include <sys/signalvar.h>
63 #include <machine/md_var.h>
64 #include <machine/vmparam.h>
68 #include <vm/vm_extern.h>
69 #include <vm/vm_page.h>
71 #include <machine/memdev.h>
73 struct mem_range_softc mem_range_softc;
77 memrw(struct cdev *dev, struct uio *uio, int flags)
81 vm_offset_t va, eva, off, v;
91 while (uio->uio_resid > 0 && !error) {
93 if (iov->iov_len == 0) {
96 if (uio->uio_iovcnt < 0)
100 if (dev2unit(dev) == CDEV_MINOR_MEM) {
103 off = uio->uio_offset & PAGE_MASK;
104 cnt = PAGE_SIZE - ((vm_offset_t)iov->iov_base &
106 cnt = min(cnt, PAGE_SIZE - off);
107 cnt = min(cnt, iov->iov_len);
109 m.phys_addr = trunc_page(v);
111 error = uiomove_fromphys(&marr, off, cnt, uio);
113 else if (dev2unit(dev) == CDEV_MINOR_KMEM) {
114 va = uio->uio_offset;
116 va = trunc_page(uio->uio_offset);
117 eva = round_page(uio->uio_offset
121 * Make sure that all the pages are currently resident
122 * so that we don't create any zero-fill pages.
124 if (va >= VM_MIN_KERNEL_ADDRESS &&
125 eva <= VM_MAX_KERNEL_ADDRESS) {
126 for (; va < eva; va += PAGE_SIZE)
127 if (pmap_extract(kernel_pmap, va) == 0)
130 prot = (uio->uio_rw == UIO_READ)
131 ? VM_PROT_READ : VM_PROT_WRITE;
133 va = uio->uio_offset;
134 if (kernacc((void *) va, iov->iov_len, prot)
139 va = uio->uio_offset;
140 error = uiomove((void *)va, iov->iov_len, uio);
149 * allow user processes to MMAP some memory sections
150 * instead of going through read/write
153 memmmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr,
154 int prot, vm_memattr_t *memattr)
156 if (dev2unit(dev) != CDEV_MINOR_MEM)