1 /*-
2 * Copyright (c) 1988 University of Utah.
3 * Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
4 * All rights reserved.
5 *
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.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
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.
22 *
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
33 * SUCH DAMAGE.
34 *
35 * from: Utah $Hdr: mem.c 1.13 89/10/08$
36 * from: @(#)mem.c 7.2 (Berkeley) 5/9/91
37 */
38
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
41
42 /*
43 * Memory special file
44 */
45
46 #include <sys/param.h>
47 #include <sys/conf.h>
48 #include <sys/fcntl.h>
49 #include <sys/kernel.h>
50 #include <sys/lock.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>
56 #include <sys/proc.h>
57 #include <sys/msgbuf.h>
58 #include <sys/systm.h>
59 #include <sys/signalvar.h>
60 #include <sys/uio.h>
61
62 #include <machine/md_var.h>
63 #include <machine/vmparam.h>
64
65 #include <vm/vm.h>
66 #include <vm/pmap.h>
67 #include <vm/vm_extern.h>
68 #include <vm/vm_page.h>
69
70 #include <machine/memdev.h>
71
72 static void ppc_mrinit(struct mem_range_softc *);
73 static int ppc_mrset(struct mem_range_softc *, struct mem_range_desc *, int *);
74
75 MALLOC_DEFINE(M_MEMDESC, "memdesc", "memory range descriptors");
76
77 static struct mem_range_ops ppc_mem_range_ops = {
78 ppc_mrinit,
79 ppc_mrset,
80 NULL,
81 NULL
82 };
83 struct mem_range_softc mem_range_softc = {
84 &ppc_mem_range_ops,
85 0, 0, NULL
86 };
87
88 /* ARGSUSED */
89 int
90 memrw(struct cdev *dev, struct uio *uio, int flags)
91 {
92 struct iovec *iov;
93 int error = 0;
94 vm_offset_t va, eva, off, v;
95 vm_prot_t prot;
96 struct vm_page m;
97 vm_page_t marr;
98 vm_size_t cnt;
99
100 cnt = 0;
101 error = 0;
102
103 while (uio->uio_resid > 0 && !error) {
104 iov = uio->uio_iov;
105 if (iov->iov_len == 0) {
106 uio->uio_iov++;
107 uio->uio_iovcnt--;
108 if (uio->uio_iovcnt < 0)
109 panic("memrw");
110 continue;
111 }
112 if (dev2unit(dev) == CDEV_MINOR_MEM) {
113 kmem_direct_mapped: v = uio->uio_offset;
114
115 off = uio->uio_offset & PAGE_MASK;
116 cnt = PAGE_SIZE - ((vm_offset_t)iov->iov_base &
117 PAGE_MASK);
118 cnt = min(cnt, PAGE_SIZE - off);
119 cnt = min(cnt, iov->iov_len);
120
121 if (mem_valid(v, cnt)) {
122 error = EFAULT;
123 break;
124 }
125
126 if (!pmap_dev_direct_mapped(v, cnt)) {
127 error = uiomove((void *)v, cnt, uio);
128 } else {
129 m.phys_addr = trunc_page(v);
130 marr = &m;
131 error = uiomove_fromphys(&marr, off, cnt, uio);
132 }
133 }
134 else if (dev2unit(dev) == CDEV_MINOR_KMEM) {
135 va = uio->uio_offset;
136
137 if ((va < VM_MIN_KERNEL_ADDRESS) || (va > virtual_end))
138 goto kmem_direct_mapped;
139
140 va = trunc_page(uio->uio_offset);
141 eva = round_page(uio->uio_offset
142 + iov->iov_len);
143
144 /*
145 * Make sure that all the pages are currently resident
146 * so that we don't create any zero-fill pages.
147 */
148
149 for (; va < eva; va += PAGE_SIZE)
150 if (pmap_extract(kernel_pmap, va) == 0)
151 return (EFAULT);
152
153 prot = (uio->uio_rw == UIO_READ)
154 ? VM_PROT_READ : VM_PROT_WRITE;
155
156 va = uio->uio_offset;
157 if (kernacc((void *) va, iov->iov_len, prot)
158 == FALSE)
159 return (EFAULT);
160
161 error = uiomove((void *)va, iov->iov_len, uio);
162
163 continue;
164 }
165 }
166
167 return (error);
168 }
169
170 /*
171 * allow user processes to MMAP some memory sections
172 * instead of going through read/write
173 */
174 int
175 memmmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr,
176 int prot, vm_memattr_t *memattr)
177 {
178 int i;
179
180 if (dev2unit(dev) == CDEV_MINOR_MEM)
181 *paddr = offset;
182 else
183 return (EFAULT);
184
185 for (i = 0; i < mem_range_softc.mr_ndesc; i++) {
186 if (!(mem_range_softc.mr_desc[i].mr_flags & MDF_ACTIVE))
187 continue;
188
189 if (offset >= mem_range_softc.mr_desc[i].mr_base &&
190 offset < mem_range_softc.mr_desc[i].mr_base +
191 mem_range_softc.mr_desc[i].mr_len) {
192 switch (mem_range_softc.mr_desc[i].mr_flags &
193 MDF_ATTRMASK) {
194 case MDF_WRITEBACK:
195 *memattr = VM_MEMATTR_WRITE_BACK;
196 break;
197 case MDF_WRITECOMBINE:
198 *memattr = VM_MEMATTR_WRITE_COMBINING;
199 break;
200 case MDF_UNCACHEABLE:
201 *memattr = VM_MEMATTR_UNCACHEABLE;
202 break;
203 case MDF_WRITETHROUGH:
204 *memattr = VM_MEMATTR_WRITE_THROUGH;
205 break;
206 }
207
208 break;
209 }
210 }
211
212 return (0);
213 }
214
215 static void
216 ppc_mrinit(struct mem_range_softc *sc)
217 {
218 sc->mr_cap = 0;
219 sc->mr_ndesc = 8; /* XXX: Should be dynamically expandable */
220 sc->mr_desc = malloc(sc->mr_ndesc * sizeof(struct mem_range_desc),
221 M_MEMDESC, M_WAITOK | M_ZERO);
222 }
223
224 static int
225 ppc_mrset(struct mem_range_softc *sc, struct mem_range_desc *desc, int *arg)
226 {
227 int i;
228
229 switch(*arg) {
230 case MEMRANGE_SET_UPDATE:
231 for (i = 0; i < sc->mr_ndesc; i++) {
232 if (!sc->mr_desc[i].mr_len) {
233 sc->mr_desc[i] = *desc;
234 sc->mr_desc[i].mr_flags |= MDF_ACTIVE;
235 return (0);
236 }
237 if (sc->mr_desc[i].mr_base == desc->mr_base &&
238 sc->mr_desc[i].mr_len == desc->mr_len)
239 return (EEXIST);
240 }
241 return (ENOSPC);
242 case MEMRANGE_SET_REMOVE:
243 for (i = 0; i < sc->mr_ndesc; i++)
244 if (sc->mr_desc[i].mr_base == desc->mr_base &&
245 sc->mr_desc[i].mr_len == desc->mr_len) {
246 bzero(&sc->mr_desc[i], sizeof(sc->mr_desc[i]));
247 return (0);
248 }
249 return (ENOENT);
250 default:
251 return (EOPNOTSUPP);
252 }
253
254 return (0);
255 }
256
257 /*
258 * Operations for changing memory attributes.
259 *
260 * This is basically just an ioctl shim for mem_range_attr_get
261 * and mem_range_attr_set.
262 */
263 /* ARGSUSED */
264 int
265 memioctl(struct cdev *dev __unused, u_long cmd, caddr_t data, int flags,
266 struct thread *td)
267 {
268 int nd, error = 0;
269 struct mem_range_op *mo = (struct mem_range_op *)data;
270 struct mem_range_desc *md;
271
272 /* is this for us? */
273 if ((cmd != MEMRANGE_GET) &&
274 (cmd != MEMRANGE_SET))
275 return (ENOTTY);
276
277 /* any chance we can handle this? */
278 if (mem_range_softc.mr_op == NULL)
279 return (EOPNOTSUPP);
280
281 /* do we have any descriptors? */
282 if (mem_range_softc.mr_ndesc == 0)
283 return (ENXIO);
284
285 switch (cmd) {
286 case MEMRANGE_GET:
287 nd = imin(mo->mo_arg[0], mem_range_softc.mr_ndesc);
288 if (nd > 0) {
289 md = (struct mem_range_desc *)
290 malloc(nd * sizeof(struct mem_range_desc),
291 M_MEMDESC, M_WAITOK);
292 error = mem_range_attr_get(md, &nd);
293 if (!error)
294 error = copyout(md, mo->mo_desc,
295 nd * sizeof(struct mem_range_desc));
296 free(md, M_MEMDESC);
297 }
298 else
299 nd = mem_range_softc.mr_ndesc;
300 mo->mo_arg[0] = nd;
301 break;
302
303 case MEMRANGE_SET:
304 md = (struct mem_range_desc *)malloc(sizeof(struct mem_range_desc),
305 M_MEMDESC, M_WAITOK);
306 error = copyin(mo->mo_desc, md, sizeof(struct mem_range_desc));
307 /* clamp description string */
308 md->mr_owner[sizeof(md->mr_owner) - 1] = 0;
309 if (error == 0)
310 error = mem_range_attr_set(md, &mo->mo_arg[0]);
311 free(md, M_MEMDESC);
312 break;
313 }
314 return (error);
315 }
316
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