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1.1 nbrk 1: /* $OpenBSD: mem.c,v 1.14 2005/11/06 22:21:33 miod Exp $ */
2: /* $NetBSD: mem.c,v 1.15 1999/03/24 05:51:17 mrg Exp $ */
3:
4: /*
5: * Copyright (c) 1988 University of Utah.
6: * Copyright (c) 1982, 1986, 1990, 1993
7: * The Regents of the University of California. All rights reserved.
8: *
9: * This code is derived from software contributed to Berkeley by
10: * the Systems Programming Group of the University of Utah Computer
11: * Science Department.
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: * @(#)mem.c 8.3 (Berkeley) 1/12/94
38: */
39:
40: /*
41: * Memory special file
42: */
43:
44: #include <sys/param.h>
45: #include <sys/conf.h>
46: #include <sys/buf.h>
47: #include <sys/systm.h>
48: #include <sys/uio.h>
49: #include <sys/malloc.h>
50: #include <sys/proc.h>
51:
52: #include <machine/pte.h>
53: #include <machine/mtpr.h>
54:
55: #include <uvm/uvm_extern.h>
56:
57: extern unsigned int avail_end;
58: caddr_t zeropage;
59:
60: #define mmread mmrw
61: #define mmwrite mmrw
62: cdev_decl(mm);
63:
64: /*ARGSUSED*/
65: int
66: mmopen(dev, flag, mode, p)
67: dev_t dev;
68: int flag, mode;
69: struct proc *p;
70: {
71:
72: switch (minor(dev)) {
73: case 0:
74: case 1:
75: case 2:
76: case 12:
77: return (0);
78: default:
79: return (ENXIO);
80: }
81: }
82:
83: /*ARGSUSED*/
84: int
85: mmclose(dev, flag, mode, p)
86: dev_t dev;
87: int flag, mode;
88: struct proc *p;
89: {
90:
91: return (0);
92: }
93:
94: /*ARGSUSED*/
95: int
96: mmrw(dev, uio, flags)
97: dev_t dev;
98: struct uio *uio;
99: int flags;
100: {
101: vaddr_t v;
102: int c;
103: struct iovec *iov;
104: int error = 0;
105:
106: while (uio->uio_resid > 0 && error == 0) {
107: iov = uio->uio_iov;
108: if (iov->iov_len == 0) {
109: uio->uio_iov++;
110: uio->uio_iovcnt--;
111: if (uio->uio_iovcnt < 0)
112: panic("mmrw");
113: continue;
114: }
115: switch (minor(dev)) {
116:
117: /* minor device 0 is physical memory */
118: case 0:
119: v = uio->uio_offset;
120: if (v < 0 || v >= avail_end) {
121: return (EFAULT);
122: }
123:
124: c = min(iov->iov_len, MAXPHYS);
125: error = uiomove((caddr_t)v + KERNBASE, c, uio);
126: continue;
127: /* minor device 1 is kernel memory */
128: case 1:
129: v = uio->uio_offset;
130: c = min(iov->iov_len, MAXPHYS);
131: if (!uvm_kernacc((caddr_t)v, c,
132: uio->uio_rw == UIO_READ ? B_READ : B_WRITE))
133: return (EFAULT);
134: error = uiomove((caddr_t)v, c, uio);
135: continue;
136:
137: /* minor device 2 is EOF/RATHOLE */
138: case 2:
139: if (uio->uio_rw == UIO_WRITE)
140: uio->uio_resid = 0;
141: return (0);
142:
143: /* minor device 12 (/dev/zero) is source of nulls on read, rathole on write */
144: case 12:
145: if (uio->uio_rw == UIO_WRITE) {
146: c = iov->iov_len;
147: break;
148: }
149: if (zeropage == NULL) {
150: zeropage = (caddr_t)
151: malloc(PAGE_SIZE, M_TEMP, M_WAITOK);
152: bzero(zeropage, PAGE_SIZE);
153: }
154: c = min(iov->iov_len, PAGE_SIZE);
155: error = uiomove(zeropage, c, uio);
156: continue;
157:
158: default:
159: return (ENXIO);
160: }
161: if (error)
162: break;
163: iov->iov_base = (caddr_t)iov->iov_base + c;
164: iov->iov_len -= c;
165: uio->uio_offset += c;
166: uio->uio_resid -= c;
167: }
168: return (error);
169: }
170:
171: paddr_t
172: mmmmap(dev, off, prot)
173: dev_t dev;
174: off_t off;
175: int prot;
176: {
177:
178: return (-1);
179: }
180:
181: int
182: mmioctl(dev, cmd, data, flags, p)
183: dev_t dev;
184: u_long cmd;
185: caddr_t data;
186: int flags;
187: struct proc *p;
188: {
189: return (EOPNOTSUPP);
190: }