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/kernel.h>
51 #include <sys/ioccom.h>
52 #include <sys/malloc.h>
53 #include <sys/memrange.h>
54 #include <sys/module.h>
55 #include <sys/mutex.h>
57 #include <sys/msgbuf.h>
58 #include <sys/systm.h>
59 #include <sys/signalvar.h>
62 #include <machine/md_var.h>
63 #include <machine/vmparam.h>
67 #include <vm/vm_extern.h>
68 #include <vm/vm_page.h>
70 #include <machine/memdev.h>
72 static void ppc_mrinit(struct mem_range_softc *);
73 static int ppc_mrset(struct mem_range_softc *, struct mem_range_desc *, int *);
75 MALLOC_DEFINE(M_MEMDESC, "memdesc", "memory range descriptors");
77 static struct mem_range_ops ppc_mem_range_ops = {
83 struct mem_range_softc mem_range_softc = {
90 memrw(struct cdev *dev, struct uio *uio, int flags)
94 vm_offset_t va, eva, off, v;
103 while (uio->uio_resid > 0 && !error) {
105 if (iov->iov_len == 0) {
108 if (uio->uio_iovcnt < 0)
112 if (dev2unit(dev) == CDEV_MINOR_MEM) {
113 kmem_direct_mapped: v = uio->uio_offset;
115 off = uio->uio_offset & PAGE_MASK;
116 cnt = PAGE_SIZE - ((vm_offset_t)iov->iov_base &
118 cnt = min(cnt, PAGE_SIZE - off);
119 cnt = min(cnt, iov->iov_len);
121 if (mem_valid(v, cnt)) {
126 if (!pmap_dev_direct_mapped(v, cnt)) {
127 error = uiomove((void *)v, cnt, uio);
129 m.phys_addr = trunc_page(v);
131 error = uiomove_fromphys(&marr, off, cnt, uio);
134 else if (dev2unit(dev) == CDEV_MINOR_KMEM) {
135 va = uio->uio_offset;
137 if ((va < VM_MIN_KERNEL_ADDRESS) || (va > virtual_end))
138 goto kmem_direct_mapped;
140 va = trunc_page(uio->uio_offset);
141 eva = round_page(uio->uio_offset
145 * Make sure that all the pages are currently resident
146 * so that we don't create any zero-fill pages.
149 for (; va < eva; va += PAGE_SIZE)
150 if (pmap_extract(kernel_pmap, va) == 0)
153 prot = (uio->uio_rw == UIO_READ)
154 ? VM_PROT_READ : VM_PROT_WRITE;
156 va = uio->uio_offset;
157 if (kernacc((void *) va, iov->iov_len, prot)
161 error = uiomove((void *)va, iov->iov_len, uio);
171 * allow user processes to MMAP some memory sections
172 * instead of going through read/write
175 memmmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr,
176 int prot, vm_memattr_t *memattr)
180 if (dev2unit(dev) == CDEV_MINOR_MEM)
182 else if (dev2unit(dev) == CDEV_MINOR_KMEM)
183 *paddr = vtophys(offset);
187 for (i = 0; i < mem_range_softc.mr_ndesc; i++) {
188 if (!(mem_range_softc.mr_desc[i].mr_flags & MDF_ACTIVE))
191 if (offset >= mem_range_softc.mr_desc[i].mr_base &&
192 offset < mem_range_softc.mr_desc[i].mr_base +
193 mem_range_softc.mr_desc[i].mr_len) {
194 switch (mem_range_softc.mr_desc[i].mr_flags &
197 *memattr = VM_MEMATTR_WRITE_BACK;
199 case MDF_WRITECOMBINE:
200 *memattr = VM_MEMATTR_WRITE_COMBINING;
202 case MDF_UNCACHEABLE:
203 *memattr = VM_MEMATTR_UNCACHEABLE;
205 case MDF_WRITETHROUGH:
206 *memattr = VM_MEMATTR_WRITE_THROUGH;
218 ppc_mrinit(struct mem_range_softc *sc)
221 sc->mr_ndesc = 8; /* XXX: Should be dynamically expandable */
222 sc->mr_desc = malloc(sc->mr_ndesc * sizeof(struct mem_range_desc),
223 M_MEMDESC, M_WAITOK | M_ZERO);
227 ppc_mrset(struct mem_range_softc *sc, struct mem_range_desc *desc, int *arg)
232 case MEMRANGE_SET_UPDATE:
233 for (i = 0; i < sc->mr_ndesc; i++) {
234 if (!sc->mr_desc[i].mr_len) {
235 sc->mr_desc[i] = *desc;
236 sc->mr_desc[i].mr_flags |= MDF_ACTIVE;
239 if (sc->mr_desc[i].mr_base == desc->mr_base &&
240 sc->mr_desc[i].mr_len == desc->mr_len)
244 case MEMRANGE_SET_REMOVE:
245 for (i = 0; i < sc->mr_ndesc; i++)
246 if (sc->mr_desc[i].mr_base == desc->mr_base &&
247 sc->mr_desc[i].mr_len == desc->mr_len) {
248 bzero(&sc->mr_desc[i], sizeof(sc->mr_desc[i]));
260 * Operations for changing memory attributes.
262 * This is basically just an ioctl shim for mem_range_attr_get
263 * and mem_range_attr_set.
267 memioctl(struct cdev *dev __unused, u_long cmd, caddr_t data, int flags,
271 struct mem_range_op *mo = (struct mem_range_op *)data;
272 struct mem_range_desc *md;
274 /* is this for us? */
275 if ((cmd != MEMRANGE_GET) &&
276 (cmd != MEMRANGE_SET))
279 /* any chance we can handle this? */
280 if (mem_range_softc.mr_op == NULL)
283 /* do we have any descriptors? */
284 if (mem_range_softc.mr_ndesc == 0)
289 nd = imin(mo->mo_arg[0], mem_range_softc.mr_ndesc);
291 md = (struct mem_range_desc *)
292 malloc(nd * sizeof(struct mem_range_desc),
293 M_MEMDESC, M_WAITOK);
294 error = mem_range_attr_get(md, &nd);
296 error = copyout(md, mo->mo_desc,
297 nd * sizeof(struct mem_range_desc));
301 nd = mem_range_softc.mr_ndesc;
306 md = (struct mem_range_desc *)malloc(sizeof(struct mem_range_desc),
307 M_MEMDESC, M_WAITOK);
308 error = copyin(mo->mo_desc, md, sizeof(struct mem_range_desc));
309 /* clamp description string */
310 md->mr_owner[sizeof(md->mr_owner) - 1] = 0;
312 error = mem_range_attr_set(md, &mo->mo_arg[0]);