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
72static void ppc_mrinit(struct mem_range_softc *);
73static int ppc_mrset(struct mem_range_softc *, struct mem_range_desc *, int *);
74
75MALLOC_DEFINE(M_MEMDESC, "memdesc", "memory range descriptors");
76
77static struct mem_range_ops ppc_mem_range_ops = {
78	ppc_mrinit,
79	ppc_mrset,
80	NULL,
81	NULL
82};
83struct mem_range_softc mem_range_softc = {
84	&ppc_mem_range_ops,
85	0, 0, NULL
86};
87
88/* ARGSUSED */
89int
90memrw(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	GIANT_REQUIRED;
104
105	while (uio->uio_resid > 0 && !error) {
106		iov = uio->uio_iov;
107		if (iov->iov_len == 0) {
108			uio->uio_iov++;
109			uio->uio_iovcnt--;
110			if (uio->uio_iovcnt < 0)
111				panic("memrw");
112			continue;
113		}
114		if (dev2unit(dev) == CDEV_MINOR_MEM) {
115kmem_direct_mapped:	v = uio->uio_offset;
116
117			off = uio->uio_offset & PAGE_MASK;
118			cnt = PAGE_SIZE - ((vm_offset_t)iov->iov_base &
119			    PAGE_MASK);
120			cnt = min(cnt, PAGE_SIZE - off);
121			cnt = min(cnt, iov->iov_len);
122
123			if (mem_valid(v, cnt)) {
124				error = EFAULT;
125				break;
126			}
127
128			if (!pmap_dev_direct_mapped(v, cnt)) {
129				error = uiomove((void *)v, cnt, uio);
130			} else {
131				m.phys_addr = trunc_page(v);
132				marr = &m;
133				error = uiomove_fromphys(&marr, off, cnt, uio);
134			}
135		}
136		else if (dev2unit(dev) == CDEV_MINOR_KMEM) {
137			va = uio->uio_offset;
138
139			if ((va < VM_MIN_KERNEL_ADDRESS) || (va > virtual_end))
140				goto kmem_direct_mapped;
141
142			va = trunc_page(uio->uio_offset);
143			eva = round_page(uio->uio_offset
144			    + iov->iov_len);
145
146			/*
147			 * Make sure that all the pages are currently resident
148			 * so that we don't create any zero-fill pages.
149			 */
150
151			for (; va < eva; va += PAGE_SIZE)
152				if (pmap_extract(kernel_pmap, va) == 0)
153					return (EFAULT);
154
155			prot = (uio->uio_rw == UIO_READ)
156			    ? VM_PROT_READ : VM_PROT_WRITE;
157
158			va = uio->uio_offset;
159			if (kernacc((void *) va, iov->iov_len, prot)
160			    == FALSE)
161				return (EFAULT);
162
163			error = uiomove((void *)va, iov->iov_len, uio);
164
165			continue;
166		}
167	}
168
169	return (error);
170}
171
172/*
173 * allow user processes to MMAP some memory sections
174 * instead of going through read/write
175 */
176int
177memmmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr,
178    int prot, vm_memattr_t *memattr)
179{
180	int i;
181
182	/*
183	 * /dev/mem is the only one that makes sense through this
184	 * interface.  For /dev/kmem any physaddr we return here
185	 * could be transient and hence incorrect or invalid at
186	 * a later time.
187	 */
188	if (dev2unit(dev) != CDEV_MINOR_MEM)
189		return (-1);
190
191	/* Only direct-mapped addresses. */
192	if (mem_valid(offset, 0)
193	    && pmap_dev_direct_mapped(offset, 0))
194		return (EFAULT);
195
196	*paddr = offset;
197
198	for (i = 0; i < mem_range_softc.mr_ndesc; i++) {
199		if (!(mem_range_softc.mr_desc[i].mr_flags & MDF_ACTIVE))
200			continue;
201
202		if (offset >= mem_range_softc.mr_desc[i].mr_base &&
203		    offset < mem_range_softc.mr_desc[i].mr_base +
204		    mem_range_softc.mr_desc[i].mr_len) {
205			switch (mem_range_softc.mr_desc[i].mr_flags &
206			    MDF_ATTRMASK) {
207			case MDF_WRITEBACK:
208				*memattr = VM_MEMATTR_WRITE_BACK;
209				break;
210			case MDF_WRITECOMBINE:
211				*memattr = VM_MEMATTR_WRITE_COMBINING;
212				break;
213			case MDF_UNCACHEABLE:
214				*memattr = VM_MEMATTR_UNCACHEABLE;
215				break;
216			case MDF_WRITETHROUGH:
217				*memattr = VM_MEMATTR_WRITE_THROUGH;
218				break;
219			}
220
221			break;
222		}
223	}
224
225	return (0);
226}
227
228static void
229ppc_mrinit(struct mem_range_softc *sc)
230{
231	sc->mr_cap = 0;
232	sc->mr_ndesc = 8; /* XXX: Should be dynamically expandable */
233	sc->mr_desc = malloc(sc->mr_ndesc * sizeof(struct mem_range_desc),
234	    M_MEMDESC, M_NOWAIT | M_ZERO);
235	if (sc->mr_desc == NULL)
236		panic("%s: malloc returns NULL", __func__);
237}
238
239static int
240ppc_mrset(struct mem_range_softc *sc, struct mem_range_desc *desc, int *arg)
241{
242	int i;
243
244	switch(*arg) {
245	case MEMRANGE_SET_UPDATE:
246		for (i = 0; i < sc->mr_ndesc; i++) {
247			if (!sc->mr_desc[i].mr_len) {
248				sc->mr_desc[i] = *desc;
249				sc->mr_desc[i].mr_flags |= MDF_ACTIVE;
250				return (0);
251			}
252			if (sc->mr_desc[i].mr_base == desc->mr_base &&
253			    sc->mr_desc[i].mr_len == desc->mr_len)
254				return (EEXIST);
255		}
256		return (ENOSPC);
257	case MEMRANGE_SET_REMOVE:
258		for (i = 0; i < sc->mr_ndesc; i++)
259			if (sc->mr_desc[i].mr_base == desc->mr_base &&
260			    sc->mr_desc[i].mr_len == desc->mr_len) {
261				bzero(&sc->mr_desc[i], sizeof(sc->mr_desc[i]));
262				return (0);
263			}
264		return (ENOENT);
265	default:
266		return (EOPNOTSUPP);
267	}
268
269	return (0);
270}
271
272/*
273 * Operations for changing memory attributes.
274 *
275 * This is basically just an ioctl shim for mem_range_attr_get
276 * and mem_range_attr_set.
277 */
278/* ARGSUSED */
279int
280memioctl(struct cdev *dev __unused, u_long cmd, caddr_t data, int flags,
281    struct thread *td)
282{
283	int nd, error = 0;
284	struct mem_range_op *mo = (struct mem_range_op *)data;
285	struct mem_range_desc *md;
286
287	/* is this for us? */
288	if ((cmd != MEMRANGE_GET) &&
289	    (cmd != MEMRANGE_SET))
290		return (ENOTTY);
291
292	/* any chance we can handle this? */
293	if (mem_range_softc.mr_op == NULL)
294		return (EOPNOTSUPP);
295
296	/* do we have any descriptors? */
297	if (mem_range_softc.mr_ndesc == 0)
298		return (ENXIO);
299
300	switch (cmd) {
301	case MEMRANGE_GET:
302		nd = imin(mo->mo_arg[0], mem_range_softc.mr_ndesc);
303		if (nd > 0) {
304			md = (struct mem_range_desc *)
305				malloc(nd * sizeof(struct mem_range_desc),
306				       M_MEMDESC, M_WAITOK);
307			error = mem_range_attr_get(md, &nd);
308			if (!error)
309				error = copyout(md, mo->mo_desc,
310					nd * sizeof(struct mem_range_desc));
311			free(md, M_MEMDESC);
312		}
313		else
314			nd = mem_range_softc.mr_ndesc;
315		mo->mo_arg[0] = nd;
316		break;
317
318	case MEMRANGE_SET:
319		md = (struct mem_range_desc *)malloc(sizeof(struct mem_range_desc),
320						    M_MEMDESC, M_WAITOK);
321		error = copyin(mo->mo_desc, md, sizeof(struct mem_range_desc));
322		/* clamp description string */
323		md->mr_owner[sizeof(md->mr_owner) - 1] = 0;
324		if (error == 0)
325			error = mem_range_attr_set(md, &mo->mo_arg[0]);
326		free(md, M_MEMDESC);
327		break;
328	}
329	return (error);
330}
331