1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
|
/*-
* Copyright (c) 1988 University of Utah.
* Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department, and code derived from software contributed to
* Berkeley by William Jolitz.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: Utah $Hdr: mem.c 1.13 89/10/08$
* from: @(#)mem.c 7.2 (Berkeley) 5/9/91
* $Id: mem.c,v 1.8 1994/05/25 08:54:24 rgrimes Exp $
*/
/*
* Memory special file
*/
#include <sys/param.h>
#include <sys/conf.h>
#include <sys/buf.h>
#include <sys/systm.h>
#include <sys/uio.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <machine/cpu.h>
#include <machine/psl.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/lock.h>
#include <vm/vm_prot.h>
#include <vm/pmap.h>
extern char *ptvmmap; /* poor name! */
/*ARGSUSED*/
int
mmclose(dev, uio, flags)
dev_t dev;
struct uio *uio;
int flags;
{
struct trapframe *fp;
switch (minor(dev)) {
case 14:
fp = (struct trapframe *)curproc->p_md.md_regs;
fp->tf_eflags &= ~PSL_IOPL;
break;
default:
break;
}
return(0);
}
/*ARGSUSED*/
int
mmopen(dev, uio, flags)
dev_t dev;
struct uio *uio;
int flags;
{
struct trapframe *fp;
switch (minor(dev)) {
case 14:
fp = (struct trapframe *)curproc->p_md.md_regs;
fp->tf_eflags |= PSL_IOPL;
break;
default:
break;
}
return(0);
}
/*ARGSUSED*/
int
mmrw(dev, uio, flags)
dev_t dev;
struct uio *uio;
int flags;
{
register int o;
register u_int c, v;
register struct iovec *iov;
int error = 0;
caddr_t zbuf = NULL;
while (uio->uio_resid > 0 && error == 0) {
iov = uio->uio_iov;
if (iov->iov_len == 0) {
uio->uio_iov++;
uio->uio_iovcnt--;
if (uio->uio_iovcnt < 0)
panic("mmrw");
continue;
}
switch (minor(dev)) {
/* minor device 0 is physical memory */
case 0:
v = uio->uio_offset;
pmap_enter(kernel_pmap, (vm_offset_t)ptvmmap, v,
uio->uio_rw == UIO_READ ? VM_PROT_READ : VM_PROT_WRITE,
TRUE);
o = (int)uio->uio_offset & PGOFSET;
c = (u_int)(NBPG - ((int)iov->iov_base & PGOFSET));
c = min(c, (u_int)(NBPG - o));
c = min(c, (u_int)iov->iov_len);
error = uiomove((caddr_t)&ptvmmap[o], (int)c, uio);
pmap_remove(kernel_pmap, (vm_offset_t)ptvmmap,
(vm_offset_t)&ptvmmap[NBPG]);
continue;
/* minor device 1 is kernel memory */
case 1:
c = iov->iov_len;
if (!kernacc((caddr_t)(int)uio->uio_offset, c,
uio->uio_rw == UIO_READ ? B_READ : B_WRITE))
return(EFAULT);
error = uiomove((caddr_t)(int)uio->uio_offset, (int)c, uio);
continue;
/* minor device 2 is EOF/RATHOLE */
case 2:
if (uio->uio_rw == UIO_READ)
return (0);
c = iov->iov_len;
break;
/* minor device 12 (/dev/zero) is source of nulls on read, rathole on write */
case 12:
if (uio->uio_rw == UIO_WRITE) {
c = iov->iov_len;
break;
}
if (zbuf == NULL) {
zbuf = (caddr_t)
malloc(CLBYTES, M_TEMP, M_WAITOK);
bzero(zbuf, CLBYTES);
}
c = min(iov->iov_len, CLBYTES);
error = uiomove(zbuf, (int)c, uio);
continue;
#ifdef notyet
/* 386 I/O address space (/dev/ioport[bwl]) is a read/write access to seperate
i/o device address bus, different than memory bus. Semantics here are
very different than ordinary read/write, as if iov_len is a multiple
an implied string move from a single port will be done. Note that lseek
must be used to set the port number reliably. */
case 14:
if (iov->iov_len == 1) {
u_char tmp;
tmp = inb(uio->uio_offset);
error = uiomove (&tmp, iov->iov_len, uio);
} else {
if (!useracc((caddr_t)iov->iov_base,
iov->iov_len, uio->uio_rw))
return (EFAULT);
insb(uio->uio_offset, iov->iov_base,
iov->iov_len);
}
break;
case 15:
if (iov->iov_len == sizeof (short)) {
u_short tmp;
tmp = inw(uio->uio_offset);
error = uiomove (&tmp, iov->iov_len, uio);
} else {
if (!useracc((caddr_t)iov->iov_base,
iov->iov_len, uio->uio_rw))
return (EFAULT);
insw(uio->uio_offset, iov->iov_base,
iov->iov_len/ sizeof (short));
}
break;
case 16:
if (iov->iov_len == sizeof (long)) {
u_long tmp;
tmp = inl(uio->uio_offset);
error = uiomove (&tmp, iov->iov_len, uio);
} else {
if (!useracc((caddr_t)iov->iov_base,
iov->iov_len, uio->uio_rw))
return (EFAULT);
insl(uio->uio_offset, iov->iov_base,
iov->iov_len/ sizeof (long));
}
break;
#endif
default:
return (ENXIO);
}
if (error)
break;
iov->iov_base += c;
iov->iov_len -= c;
uio->uio_offset += c;
uio->uio_resid -= c;
}
if (zbuf)
free(zbuf, M_TEMP);
return (error);
}
/*******************************************************\
* allow user processes to MMAP some memory sections *
* instead of going through read/write *
\*******************************************************/
int memmmap(dev_t dev, int offset, int nprot)
{
switch (minor(dev))
{
/* minor device 0 is physical memory */
case 0:
return i386_btop(offset);
/* minor device 1 is kernel memory */
case 1:
return i386_btop(vtophys(offset));
default:
return -1;
}
}
|
