2 * Copyright (c) 1988 University of Utah.
3 * Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
6 * This code is derived from software contributed to Berkeley by
7 * the Systems Programming Group of the University of Utah Computer
8 * Science Department, and code derived from software contributed to
9 * Berkeley by William Jolitz.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * from: Utah $Hdr: mem.c 1.13 89/10/08$
36 * from: @(#)mem.c 7.2 (Berkeley) 5/9/91
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
46 #include <sys/param.h>
48 #include <sys/fcntl.h>
49 #include <sys/ioccom.h>
50 #include <sys/kernel.h>
52 #include <sys/malloc.h>
53 #include <sys/memrange.h>
54 #include <sys/module.h>
55 #include <sys/mutex.h>
57 #include <sys/signalvar.h>
58 #include <sys/systm.h>
61 #include <machine/specialreg.h>
62 #include <machine/vmparam.h>
66 #include <vm/vm_extern.h>
68 #include <machine/memdev.h>
71 * Used in /dev/mem drivers and elsewhere
73 MALLOC_DEFINE(M_MEMDESC, "memdesc", "memory range descriptors");
77 memrw(struct cdev *dev, struct uio *uio, int flags)
82 vm_offset_t addr, eaddr;
88 sflags = curthread_pflags_set(TDP_DEVMEMIO);
89 while (uio->uio_resid > 0 && error == 0) {
91 if (iov->iov_len == 0) {
94 if (uio->uio_iovcnt < 0)
98 if (dev2unit(dev) == CDEV_MINOR_MEM) {
102 c = min(uio->uio_resid, (u_int)(PAGE_SIZE - o));
104 if (v < DMAP_MIN_ADDRESS ||
105 (v > DMAP_MIN_ADDRESS + dmaplimit &&
106 v <= DMAP_MAX_ADDRESS) ||
107 pmap_kextract(v) == 0) {
111 error = uiomove((void *)v, (int)c, uio);
114 else if (dev2unit(dev) == CDEV_MINOR_KMEM) {
117 if (v >= DMAP_MIN_ADDRESS && v < DMAP_MAX_ADDRESS) {
125 * Make sure that all of the pages are currently
126 * resident so that we don't create any zero-fill
129 addr = trunc_page(v);
130 eaddr = round_page(v + c);
132 if (addr < VM_MIN_KERNEL_ADDRESS) {
136 for (; addr < eaddr; addr += PAGE_SIZE) {
137 if (pmap_extract(kernel_pmap, addr) == 0) {
142 if (!kernacc((caddr_t)(long)v, c,
143 uio->uio_rw == UIO_READ ?
144 VM_PROT_READ : VM_PROT_WRITE)) {
149 error = uiomove((caddr_t)(long)v, (int)c, uio);
155 curthread_pflags_restore(sflags);
160 * allow user processes to MMAP some memory sections
161 * instead of going through read/write
165 memmmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr,
166 int prot __unused, vm_memattr_t *memattr __unused)
168 if (dev2unit(dev) == CDEV_MINOR_MEM)
170 else if (dev2unit(dev) == CDEV_MINOR_KMEM)
171 *paddr = vtophys(offset);
177 * Operations for changing memory attributes.
179 * This is basically just an ioctl shim for mem_range_attr_get
180 * and mem_range_attr_set.
184 memioctl(struct cdev *dev __unused, u_long cmd, caddr_t data, int flags,
188 struct mem_range_op *mo = (struct mem_range_op *)data;
189 struct mem_range_desc *md;
191 /* is this for us? */
192 if ((cmd != MEMRANGE_GET) &&
193 (cmd != MEMRANGE_SET))
196 /* any chance we can handle this? */
197 if (mem_range_softc.mr_op == NULL)
200 /* do we have any descriptors? */
201 if (mem_range_softc.mr_ndesc == 0)
206 nd = imin(mo->mo_arg[0], mem_range_softc.mr_ndesc);
208 md = (struct mem_range_desc *)
209 malloc(nd * sizeof(struct mem_range_desc),
210 M_MEMDESC, M_WAITOK);
211 error = mem_range_attr_get(md, &nd);
213 error = copyout(md, mo->mo_desc,
214 nd * sizeof(struct mem_range_desc));
218 nd = mem_range_softc.mr_ndesc;
223 md = (struct mem_range_desc *)malloc(sizeof(struct mem_range_desc),
224 M_MEMDESC, M_WAITOK);
225 error = copyin(mo->mo_desc, md, sizeof(struct mem_range_desc));
226 /* clamp description string */
227 md->mr_owner[sizeof(md->mr_owner) - 1] = 0;
229 error = mem_range_attr_set(md, &mo->mo_arg[0]);