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1.1 nbrk 1: /* $OpenBSD: mem.c,v 1.13 2005/12/17 07:31:26 miod Exp $ */
2: /* $NetBSD: mem.c,v 1.1 1996/09/30 16:34:50 ws 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/buf.h>
46: #include <sys/systm.h>
47: #include <sys/ioccom.h>
48: #include <sys/uio.h>
49: #include <sys/malloc.h>
50: #include <sys/types.h>
51:
52: #include <machine/cpu.h>
53:
54: #include <uvm/uvm_extern.h>
55:
56: #include <machine/conf.h>
57:
58: /* open counter for aperture */
59: #ifdef APERTURE
60: static int ap_open_count = 0;
61: extern int allowaperture;
62: #endif
63:
64: /*ARGSUSED*/
65: int
66: mmopen(dev_t dev, int flag, int mode, struct proc *p)
67: {
68:
69: switch (minor(dev)) {
70: case 0:
71: case 1:
72: case 2:
73: case 12:
74: break;
75: #ifdef APERTURE
76: case 4:
77: if (suser(p, 0) != 0 || !allowaperture)
78: return (EPERM);
79:
80: /* authorize only one simultaneous open() */
81: if (ap_open_count > 0)
82: return(EPERM);
83: ap_open_count++;
84: break;
85: #endif
86: default:
87: return (ENXIO);
88: }
89: return (0);
90: }
91:
92: /*ARGSUSED*/
93: int
94: mmclose(dev_t dev, int flag, int mode, struct proc *p)
95: {
96: #ifdef APERTURE
97: if (minor(dev) == 4)
98: ap_open_count--;
99: #endif
100: return 0;
101: }
102:
103: /*ARGSUSED*/
104: int
105: mmrw(dev_t dev, struct uio *uio, int flags)
106: {
107: vaddr_t v;
108: vsize_t c;
109: struct iovec *iov;
110: int error = 0;
111: static caddr_t zeropage;
112:
113: while (uio->uio_resid > 0 && error == 0) {
114: iov = uio->uio_iov;
115: if (iov->iov_len == 0) {
116: uio->uio_iov++;
117: uio->uio_iovcnt--;
118: if (uio->uio_iovcnt < 0)
119: panic("mmrw");
120: continue;
121: }
122: switch (minor(dev)) {
123:
124: /* minor device 0 is physical memory */
125: case 0:
126: v = uio->uio_offset;
127: c = uio->uio_resid;
128: /* This doesn't allow device mapping! XXX */
129: pmap_real_memory(&v, &c);
130: error = uiomove((caddr_t)v, c, uio);
131: continue;
132:
133: /* minor device 1 is kernel memory */
134: case 1:
135: v = uio->uio_offset;
136: c = min(iov->iov_len, MAXPHYS);
137: error = uiomove((caddr_t)v, c, uio);
138: continue;
139:
140: /* minor device 2 is EOF/RATHOLE */
141: case 2:
142: if (uio->uio_rw == UIO_WRITE)
143: uio->uio_resid = 0;
144: return 0;
145:
146: /* minor device 12 (/dev/zero) is source of nulls on read,
147: * rathole on write
148: */
149: case 12:
150: if (uio->uio_rw == UIO_WRITE) {
151: c = iov->iov_len;
152: break;
153: }
154: if (zeropage == NULL) {
155: zeropage = (caddr_t)malloc(PAGE_SIZE, M_TEMP,
156: M_WAITOK);
157: bzero(zeropage, PAGE_SIZE);
158: }
159: c = min(iov->iov_len, PAGE_SIZE);
160: error = uiomove(zeropage, c, uio);
161: continue;
162:
163: default:
164: return ENXIO;
165: }
166: if (error)
167: break;
168: iov->iov_base += c;
169: iov->iov_len -= c;
170: uio->uio_offset += c;
171: uio->uio_resid -= c;
172: }
173: return error;
174: }
175:
176: paddr_t
177: mmmmap(dev_t dev, off_t off, int prot)
178: {
179: return (-1);
180: }
181:
182: /*ARGSUSED*/
183: int
184: mmioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p)
185: {
186: return (EOPNOTSUPP);
187: }