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/ioccom.h>
54 #include <sys/malloc.h>
55 #include <sys/memrange.h>
56 #include <sys/module.h>
57 #include <sys/mutex.h>
59 #include <sys/msgbuf.h>
60 #include <sys/systm.h>
61 #include <sys/signalvar.h>
64 #include <machine/md_var.h>
65 #include <machine/vmparam.h>
69 #include <vm/vm_extern.h>
70 #include <vm/vm_page.h>
72 #include <machine/memdev.h>
74 static void ppc_mrinit(struct mem_range_softc *);
75 static int ppc_mrset(struct mem_range_softc *, struct mem_range_desc *, int *);
77 MALLOC_DEFINE(M_MEMDESC, "memdesc", "memory range descriptors");
79 static struct mem_range_ops ppc_mem_range_ops = {
85 struct mem_range_softc mem_range_softc = {
92 memrw(struct cdev *dev, struct uio *uio, int flags)
96 vm_offset_t va, eva, off, v;
105 while (uio->uio_resid > 0 && !error) {
107 if (iov->iov_len == 0) {
110 if (uio->uio_iovcnt < 0)
114 if (dev2unit(dev) == CDEV_MINOR_MEM) {
117 kmem_direct_mapped: off = v & PAGE_MASK;
118 cnt = PAGE_SIZE - ((vm_offset_t)iov->iov_base &
120 cnt = min(cnt, PAGE_SIZE - off);
121 cnt = min(cnt, iov->iov_len);
123 if (mem_valid(v, cnt)) {
128 if (hw_direct_map && !pmap_dev_direct_mapped(v, cnt)) {
129 error = uiomove((void *)PHYS_TO_DMAP(v), cnt,
132 m.phys_addr = trunc_page(v);
134 error = uiomove_fromphys(&marr, off, cnt, uio);
137 else if (dev2unit(dev) == CDEV_MINOR_KMEM) {
138 va = uio->uio_offset;
140 if ((va < VM_MIN_KERNEL_ADDRESS) || (va > virtual_end)) {
141 v = DMAP_TO_PHYS(va);
142 goto kmem_direct_mapped;
145 va = trunc_page(uio->uio_offset);
146 eva = round_page(uio->uio_offset
150 * Make sure that all the pages are currently resident
151 * so that we don't create any zero-fill pages.
154 for (; va < eva; va += PAGE_SIZE)
155 if (pmap_extract(kernel_pmap, va) == 0)
158 prot = (uio->uio_rw == UIO_READ)
159 ? VM_PROT_READ : VM_PROT_WRITE;
161 va = uio->uio_offset;
162 if (kernacc((void *) va, iov->iov_len, prot)
166 error = uiomove((void *)va, iov->iov_len, uio);
176 * allow user processes to MMAP some memory sections
177 * instead of going through read/write
180 memmmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr,
181 int prot, vm_memattr_t *memattr)
185 if (dev2unit(dev) == CDEV_MINOR_MEM)
190 for (i = 0; i < mem_range_softc.mr_ndesc; i++) {
191 if (!(mem_range_softc.mr_desc[i].mr_flags & MDF_ACTIVE))
194 if (offset >= mem_range_softc.mr_desc[i].mr_base &&
195 offset < mem_range_softc.mr_desc[i].mr_base +
196 mem_range_softc.mr_desc[i].mr_len) {
197 switch (mem_range_softc.mr_desc[i].mr_flags &
200 *memattr = VM_MEMATTR_WRITE_BACK;
202 case MDF_WRITECOMBINE:
203 *memattr = VM_MEMATTR_WRITE_COMBINING;
205 case MDF_UNCACHEABLE:
206 *memattr = VM_MEMATTR_UNCACHEABLE;
208 case MDF_WRITETHROUGH:
209 *memattr = VM_MEMATTR_WRITE_THROUGH;
221 ppc_mrinit(struct mem_range_softc *sc)
224 sc->mr_ndesc = 8; /* XXX: Should be dynamically expandable */
225 sc->mr_desc = malloc(sc->mr_ndesc * sizeof(struct mem_range_desc),
226 M_MEMDESC, M_WAITOK | M_ZERO);
230 ppc_mrset(struct mem_range_softc *sc, struct mem_range_desc *desc, int *arg)
235 case MEMRANGE_SET_UPDATE:
236 for (i = 0; i < sc->mr_ndesc; i++) {
237 if (!sc->mr_desc[i].mr_len) {
238 sc->mr_desc[i] = *desc;
239 sc->mr_desc[i].mr_flags |= MDF_ACTIVE;
242 if (sc->mr_desc[i].mr_base == desc->mr_base &&
243 sc->mr_desc[i].mr_len == desc->mr_len)
247 case MEMRANGE_SET_REMOVE:
248 for (i = 0; i < sc->mr_ndesc; i++)
249 if (sc->mr_desc[i].mr_base == desc->mr_base &&
250 sc->mr_desc[i].mr_len == desc->mr_len) {
251 bzero(&sc->mr_desc[i], sizeof(sc->mr_desc[i]));
263 * Operations for changing memory attributes.
265 * This is basically just an ioctl shim for mem_range_attr_get
266 * and mem_range_attr_set.
270 memioctl(struct cdev *dev __unused, u_long cmd, caddr_t data, int flags,
274 struct mem_range_op *mo = (struct mem_range_op *)data;
275 struct mem_range_desc *md;
277 /* is this for us? */
278 if ((cmd != MEMRANGE_GET) &&
279 (cmd != MEMRANGE_SET))
282 /* any chance we can handle this? */
283 if (mem_range_softc.mr_op == NULL)
286 /* do we have any descriptors? */
287 if (mem_range_softc.mr_ndesc == 0)
292 nd = imin(mo->mo_arg[0], mem_range_softc.mr_ndesc);
294 md = (struct mem_range_desc *)
295 malloc(nd * sizeof(struct mem_range_desc),
296 M_MEMDESC, M_WAITOK);
297 error = mem_range_attr_get(md, &nd);
299 error = copyout(md, mo->mo_desc,
300 nd * sizeof(struct mem_range_desc));
304 nd = mem_range_softc.mr_ndesc;
309 md = (struct mem_range_desc *)malloc(sizeof(struct mem_range_desc),
310 M_MEMDESC, M_WAITOK);
311 error = copyin(mo->mo_desc, md, sizeof(struct mem_range_desc));
312 /* clamp description string */
313 md->mr_owner[sizeof(md->mr_owner) - 1] = 0;
315 error = mem_range_attr_set(md, &mo->mo_arg[0]);