2 * Copyright (c) 2014 Andrew Turner
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
31 #include <sys/param.h>
32 #include <sys/systm.h>
34 #include <sys/malloc.h>
35 #include <sys/memrange.h>
38 #include <machine/memdev.h>
39 #include <machine/vmparam.h>
43 #include <vm/vm_extern.h>
44 #include <vm/vm_page.h>
46 struct mem_range_softc mem_range_softc;
49 memrw(struct cdev *dev, struct uio *uio, int flags)
60 orig_resid = uio->uio_resid;
61 while (uio->uio_resid > 0 && error == 0) {
63 if (iov->iov_len == 0) {
66 if (uio->uio_iovcnt < 0)
73 cnt = ulmin(iov->iov_len, PAGE_SIZE - (u_int)off);
77 switch(dev2unit(dev)) {
79 /* If the address is in the DMAP just copy it */
80 if (VIRT_IN_DMAP(v)) {
81 error = uiomove((void *)v, cnt, uio);
85 if (!kernacc((void *)v, cnt, uio->uio_rw == UIO_READ ?
86 VM_PROT_READ : VM_PROT_WRITE)) {
91 /* Get the physical address to read */
92 v = pmap_extract(kernel_pmap, v);
100 /* If within the DMAP use this to copy from */
101 if (PHYS_IN_DMAP(v)) {
103 error = uiomove((void *)v, cnt, uio);
107 /* Have uiomove_fromphys handle the data */
108 m.phys_addr = trunc_page(v);
110 uiomove_fromphys(&marr, off, cnt, uio);
116 * Don't return error if any byte was written. Read and write
117 * can return error only if no i/o was performed.
119 if (uio->uio_resid != orig_resid)