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 * from: FreeBSD: src/sys/i386/i386/mem.c,v 1.94 2001/09/26
38 */
39
40 #include <sys/cdefs.h>
41 __FBSDID("$FreeBSD: releng/6.0/sys/sparc64/sparc64/mem.c 133774 2004-08-15 21:37:52Z marius $");
42
43 /*
44 * Memory special file
45 *
46 * NOTE: other architectures support mmap()'ing the mem and kmem devices; this
47 * might cause illegal aliases to be created for the locked kernel page(s), so
48 * it is not implemented.
49 */
50
51 #include <sys/param.h>
52 #include <sys/conf.h>
53 #include <sys/fcntl.h>
54 #include <sys/kernel.h>
55 #include <sys/lock.h>
56 #include <sys/malloc.h>
57 #include <sys/memrange.h>
58 #include <sys/module.h>
59 #include <sys/mutex.h>
60 #include <sys/proc.h>
61 #include <sys/signalvar.h>
62 #include <sys/systm.h>
63 #include <sys/uio.h>
64
65 #include <vm/vm.h>
66 #include <vm/vm_param.h>
67 #include <vm/vm_page.h>
68 #include <vm/vm_kern.h>
69 #include <vm/pmap.h>
70 #include <vm/vm_extern.h>
71
72 #include <machine/cache.h>
73 #include <machine/md_var.h>
74 #include <machine/pmap.h>
75 #include <machine/tlb.h>
76 #include <machine/upa.h>
77
78 #include <machine/memdev.h>
79
80 struct mem_range_softc mem_range_softc;
81
82 /* ARGSUSED */
83 int
84 memrw(struct cdev *dev, struct uio *uio, int flags)
85 {
86 struct iovec *iov;
87 vm_offset_t eva;
88 vm_offset_t off;
89 vm_offset_t ova;
90 vm_offset_t va;
91 vm_prot_t prot;
92 vm_paddr_t pa;
93 vm_size_t cnt;
94 vm_page_t m;
95 int color;
96 int error;
97 int i;
98
99 cnt = 0;
100 error = 0;
101 ova = 0;
102
103 GIANT_REQUIRED;
104
105 while (uio->uio_resid > 0 && error == 0) {
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 (minor(dev) == CDEV_MINOR_MEM) {
115 pa = uio->uio_offset & ~PAGE_MASK;
116 if (!is_physical_memory(pa)) {
117 error = EFAULT;
118 break;
119 }
120
121 off = uio->uio_offset & PAGE_MASK;
122 cnt = PAGE_SIZE - ((vm_offset_t)iov->iov_base &
123 PAGE_MASK);
124 cnt = ulmin(cnt, PAGE_SIZE - off);
125 cnt = ulmin(cnt, iov->iov_len);
126
127 m = NULL;
128 for (i = 0; phys_avail[i] != 0; i += 2) {
129 if (pa >= phys_avail[i] &&
130 pa < phys_avail[i + 1]) {
131 m = PHYS_TO_VM_PAGE(pa);
132 break;
133 }
134 }
135
136 if (m != NULL) {
137 if (ova == 0) {
138 ova = kmem_alloc_wait(kernel_map,
139 PAGE_SIZE * DCACHE_COLORS);
140 }
141 if ((color = m->md.color) == -1)
142 va = ova;
143 else
144 va = ova + color * PAGE_SIZE;
145 pmap_qenter(va, &m, 1);
146 error = uiomove((void *)(va + off), cnt,
147 uio);
148 pmap_qremove(va, 1);
149 } else {
150 va = TLB_PHYS_TO_DIRECT(pa);
151 error = uiomove((void *)(va + off), cnt,
152 uio);
153 }
154 break;
155 }
156 else if (minor(dev) == CDEV_MINOR_KMEM) {
157 va = trunc_page(uio->uio_offset);
158 eva = round_page(uio->uio_offset + iov->iov_len);
159
160 /*
161 * Make sure that all of the pages are currently
162 * resident so we don't create any zero fill pages.
163 */
164 for (; va < eva; va += PAGE_SIZE)
165 if (pmap_kextract(va) == 0)
166 return (EFAULT);
167
168 prot = (uio->uio_rw == UIO_READ) ? VM_PROT_READ :
169 VM_PROT_WRITE;
170 va = uio->uio_offset;
171 if (va < VM_MIN_DIRECT_ADDRESS &&
172 kernacc((void *)va, iov->iov_len, prot) == FALSE)
173 return (EFAULT);
174
175 error = uiomove((void *)va, iov->iov_len, uio);
176 break;
177 }
178 /* else panic! */
179 }
180 if (ova != 0)
181 kmem_free_wakeup(kernel_map, ova, PAGE_SIZE * DCACHE_COLORS);
182 return (error);
183 }
184
185 void
186 dev_mem_md_init(void)
187 {
188 }
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