1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1988 University of Utah.
5 * Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
6 * All rights reserved.
7 *
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.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
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.
24 *
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
35 * SUCH DAMAGE.
36 *
37 *	from: Utah $Hdr: mem.c 1.13 89/10/08$
38 */
39
40#include <sys/cdefs.h>
41/*
42 * Memory special file
43 */
44
45#include <sys/param.h>
46#include <sys/conf.h>
47#include <sys/fcntl.h>
48#include <sys/kernel.h>
49#include <sys/lock.h>
50#include <sys/ioccom.h>
51#include <sys/malloc.h>
52#include <sys/memrange.h>
53#include <sys/module.h>
54#include <sys/mutex.h>
55#include <sys/proc.h>
56#include <sys/msgbuf.h>
57#include <sys/systm.h>
58#include <sys/signalvar.h>
59#include <sys/uio.h>
60
61#include <machine/md_var.h>
62#include <machine/vmparam.h>
63
64#include <vm/vm.h>
65#include <vm/pmap.h>
66#include <vm/vm_extern.h>
67#include <vm/vm_page.h>
68
69#include <machine/memdev.h>
70
71static void ppc_mrinit(struct mem_range_softc *);
72static int ppc_mrset(struct mem_range_softc *, struct mem_range_desc *, int *);
73
74MALLOC_DEFINE(M_MEMDESC, "memdesc", "memory range descriptors");
75
76static struct mem_range_ops ppc_mem_range_ops = {
77	ppc_mrinit,
78	ppc_mrset,
79	NULL,
80	NULL
81};
82struct mem_range_softc mem_range_softc = {
83	&ppc_mem_range_ops,
84	0, 0, NULL
85};
86
87/* ARGSUSED */
88int
89memrw(struct cdev *dev, struct uio *uio, int flags)
90{
91	struct iovec *iov;
92	int error = 0;
93	vm_offset_t va, eva, off, v;
94	vm_prot_t prot;
95	struct vm_page m;
96	vm_page_t marr;
97	vm_size_t cnt;
98	ssize_t orig_resid;
99
100	cnt = 0;
101	error = 0;
102	orig_resid = uio->uio_resid;
103
104	while (uio->uio_resid > 0 && !error) {
105		iov = uio->uio_iov;
106		if (iov->iov_len == 0) {
107			uio->uio_iov++;
108			uio->uio_iovcnt--;
109			if (uio->uio_iovcnt < 0)
110				panic("memrw");
111			continue;
112		}
113		if (dev2unit(dev) == CDEV_MINOR_MEM) {
114			v = uio->uio_offset;
115
116kmem_direct_mapped:	off = v & PAGE_MASK;
117			cnt = PAGE_SIZE - ((vm_offset_t)iov->iov_base &
118			    PAGE_MASK);
119			cnt = min(cnt, PAGE_SIZE - off);
120			cnt = min(cnt, iov->iov_len);
121
122			if (mem_valid(v, cnt)) {
123				error = EFAULT;
124				break;
125			}
126
127			if (hw_direct_map && !pmap_dev_direct_mapped(v, cnt)) {
128				error = uiomove((void *)PHYS_TO_DMAP(v), cnt,
129				    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 (hw_direct_map &&
140			    ((va < VM_MIN_KERNEL_ADDRESS) || (va > virtual_end))) {
141				v = DMAP_TO_PHYS(va);
142				goto kmem_direct_mapped;
143			}
144
145			va = trunc_page(uio->uio_offset);
146			eva = round_page(uio->uio_offset
147			    + iov->iov_len);
148
149			/*
150			 * Make sure that all the pages are currently resident
151			 * so that we don't create any zero-fill pages.
152			 */
153
154			for (; va < eva; va += PAGE_SIZE) {
155				if (pmap_extract(kernel_pmap, va) == 0) {
156					error = EFAULT;
157					break;
158				}
159			}
160			if (error != 0)
161				break;
162
163			prot = (uio->uio_rw == UIO_READ)
164			    ? VM_PROT_READ : VM_PROT_WRITE;
165
166			va = uio->uio_offset;
167			if (((va >= VM_MIN_KERNEL_ADDRESS) && (va <= virtual_end)) &&
168			    !kernacc((void *) va, iov->iov_len, prot)) {
169				error = EFAULT;
170				break;
171			}
172
173			error = uiomove((void *)va, iov->iov_len, uio);
174		}
175	}
176	/*
177	 * Don't return error if any byte was written.  Read and write
178	 * can return error only if no i/o was performed.
179	 */
180	if (uio->uio_resid != orig_resid)
181		error = 0;
182	return (error);
183}
184
185/*
186 * allow user processes to MMAP some memory sections
187 * instead of going through read/write
188 */
189int
190memmmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr,
191    int prot, vm_memattr_t *memattr)
192{
193	int i;
194
195	if (dev2unit(dev) == CDEV_MINOR_MEM)
196		*paddr = offset;
197	else
198		return (EFAULT);
199
200	for (i = 0; i < mem_range_softc.mr_ndesc; i++) {
201		if (!(mem_range_softc.mr_desc[i].mr_flags & MDF_ACTIVE))
202			continue;
203
204		if (offset >= mem_range_softc.mr_desc[i].mr_base &&
205		    offset < mem_range_softc.mr_desc[i].mr_base +
206		    mem_range_softc.mr_desc[i].mr_len) {
207			switch (mem_range_softc.mr_desc[i].mr_flags &
208			    MDF_ATTRMASK) {
209			case MDF_WRITEBACK:
210				*memattr = VM_MEMATTR_WRITE_BACK;
211				break;
212			case MDF_WRITECOMBINE:
213				*memattr = VM_MEMATTR_WRITE_COMBINING;
214				break;
215			case MDF_UNCACHEABLE:
216				*memattr = VM_MEMATTR_UNCACHEABLE;
217				break;
218			case MDF_WRITETHROUGH:
219				*memattr = VM_MEMATTR_WRITE_THROUGH;
220				break;
221			}
222
223			break;
224		}
225	}
226
227	return (0);
228}
229
230static void
231ppc_mrinit(struct mem_range_softc *sc)
232{
233	sc->mr_cap = 0;
234	sc->mr_ndesc = 8; /* XXX: Should be dynamically expandable */
235	sc->mr_desc = malloc(sc->mr_ndesc * sizeof(struct mem_range_desc),
236	    M_MEMDESC, M_WAITOK | M_ZERO);
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 */
278int
279memioctl_md(struct cdev *dev __unused, u_long cmd, caddr_t data, int flags,
280    struct thread *td)
281{
282	int nd, error = 0;
283	struct mem_range_op *mo = (struct mem_range_op *)data;
284	struct mem_range_desc *md;
285
286	/* is this for us? */
287	if ((cmd != MEMRANGE_GET) &&
288	    (cmd != MEMRANGE_SET))
289		return (ENOTTY);
290
291	/* any chance we can handle this? */
292	if (mem_range_softc.mr_op == NULL)
293		return (EOPNOTSUPP);
294
295	/* do we have any descriptors? */
296	if (mem_range_softc.mr_ndesc == 0)
297		return (ENXIO);
298
299	switch (cmd) {
300	case MEMRANGE_GET:
301		nd = imin(mo->mo_arg[0], mem_range_softc.mr_ndesc);
302		if (nd > 0) {
303			md = (struct mem_range_desc *)
304				malloc(nd * sizeof(struct mem_range_desc),
305				       M_MEMDESC, M_WAITOK);
306			error = mem_range_attr_get(md, &nd);
307			if (!error)
308				error = copyout(md, mo->mo_desc,
309					nd * sizeof(struct mem_range_desc));
310			free(md, M_MEMDESC);
311		}
312		else
313			nd = mem_range_softc.mr_ndesc;
314		mo->mo_arg[0] = nd;
315		break;
316
317	case MEMRANGE_SET:
318		md = (struct mem_range_desc *)malloc(sizeof(struct mem_range_desc),
319						    M_MEMDESC, M_WAITOK);
320		error = copyin(mo->mo_desc, md, sizeof(struct mem_range_desc));
321		/* clamp description string */
322		md->mr_owner[sizeof(md->mr_owner) - 1] = 0;
323		if (error == 0)
324			error = mem_range_attr_set(md, &mo->mo_arg[0]);
325		free(md, M_MEMDESC);
326		break;
327	}
328	return (error);
329}
330