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: releng/6.3/sys/powerpc/powerpc/mem.c 133855 2004-08-16 13:07:40Z ssouhlal $");
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/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/ofw_machdep.h>
63 #include <machine/vmparam.h>
64
65 #include <vm/vm.h>
66 #include <vm/pmap.h>
67 #include <vm/vm_extern.h>
68
69 #include <machine/memdev.h>
70
71 struct mem_range_softc mem_range_softc;
72
73 /* ARGSUSED */
74 int
75 memrw(struct cdev *dev, struct uio *uio, int flags)
76 {
77 struct iovec *iov;
78 int error = 0;
79 vm_offset_t va, eva, off, v;
80 vm_prot_t prot;
81 vm_size_t cnt;
82
83 cnt = 0;
84 error = 0;
85
86 GIANT_REQUIRED;
87
88 while (uio->uio_resid > 0 && !error) {
89 iov = uio->uio_iov;
90 if (iov->iov_len == 0) {
91 uio->uio_iov++;
92 uio->uio_iovcnt--;
93 if (uio->uio_iovcnt < 0)
94 panic("memrw");
95 continue;
96 }
97 if (minor(dev) == CDEV_MINOR_MEM) {
98 kmem_direct_mapped: v = uio->uio_offset;
99
100 off = uio->uio_offset & PAGE_MASK;
101 cnt = PAGE_SIZE - ((vm_offset_t)iov->iov_base &
102 PAGE_MASK);
103 cnt = min(cnt, PAGE_SIZE - off);
104 cnt = min(cnt, iov->iov_len);
105
106 if (mem_valid(v, cnt)
107 && pmap_dev_direct_mapped(v, cnt)) {
108 error = EFAULT;
109 break;
110 }
111
112 uiomove((void *)v, cnt, uio);
113 break;
114 }
115 else if (minor(dev) == CDEV_MINOR_KMEM) {
116 va = uio->uio_offset;
117
118 if ((va < VM_MIN_KERNEL_ADDRESS)
119 || (va > VM_MAX_KERNEL_ADDRESS))
120 goto kmem_direct_mapped;
121
122 va = trunc_page(uio->uio_offset);
123 eva = round_page(uio->uio_offset
124 + iov->iov_len);
125
126 /*
127 * Make sure that all the pages are currently resident
128 * so that we don't create any zero-fill pages.
129 */
130
131 for (; va < eva; va += PAGE_SIZE)
132 if (pmap_extract(kernel_pmap, va)
133 == 0)
134 return (EFAULT);
135
136 prot = (uio->uio_rw == UIO_READ)
137 ? VM_PROT_READ : VM_PROT_WRITE;
138
139 va = uio->uio_offset;
140 if (kernacc((void *) va, iov->iov_len, prot)
141 == FALSE)
142 return (EFAULT);
143
144 error = uiomove((void *)va, iov->iov_len, uio);
145
146 continue;
147 }
148 }
149
150 return (error);
151 }
152
153 /*
154 * allow user processes to MMAP some memory sections
155 * instead of going through read/write
156 */
157 int
158 memmmap(struct cdev *dev, vm_offset_t offset, vm_paddr_t *paddr, int prot)
159 {
160 /*
161 * /dev/mem is the only one that makes sense through this
162 * interface. For /dev/kmem any physaddr we return here
163 * could be transient and hence incorrect or invalid at
164 * a later time.
165 */
166 if (minor(dev) != CDEV_MINOR_MEM)
167 return (-1);
168
169 /* Only direct-mapped addresses. */
170 if (mem_valid(offset, 0)
171 && pmap_dev_direct_mapped(offset, 0))
172 return (EFAULT);
173
174 *paddr = offset;
175
176 return (0);
177 }
178
179 void
180 dev_mem_md_init(void)
181 {
182 }
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