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1.1 nbrk 1: /* $OpenBSD: mem.c,v 1.3 2004/05/07 15:30:02 miod Exp $ */
2:
3: /*
4: * Copyright (c) 1988 University of Utah.
5: * Copyright (c) 1982, 1986, 1990, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * the Systems Programming Group of the University of Utah Computer
10: * Science Department.
11: *
12: * Redistribution and use in source and binary forms, with or without
13: * modification, are permitted provided that the following conditions
14: * are met:
15: * 1. Redistributions of source code must retain the above copyright
16: * notice, this list of conditions and the following disclaimer.
17: * 2. Redistributions in binary form must reproduce the above copyright
18: * notice, this list of conditions and the following disclaimer in the
19: * documentation and/or other materials provided with the distribution.
20: * 3. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: *
36: * @(#)mem.c 8.3 (Berkeley) 1/12/94
37: */
38:
39: /*
40: * Memory special file
41: */
42:
43: #include <sys/param.h>
44: #include <sys/buf.h>
45: #include <sys/systm.h>
46: #include <sys/uio.h>
47: #include <sys/malloc.h>
48:
49: #include <machine/board.h>
50: #include <machine/conf.h>
51:
52: #include <uvm/uvm_extern.h>
53:
54: caddr_t zeropage;
55: extern vaddr_t last_addr;
56:
57: /*ARGSUSED*/
58: int
59: mmopen(dev, flag, mode, p)
60: dev_t dev;
61: int flag, mode;
62: struct proc *p;
63: {
64:
65: switch (minor(dev)) {
66: case 0:
67: case 1:
68: case 2:
69: case 12:
70: return (0);
71: default:
72: return (ENXIO);
73: }
74: }
75:
76: /*ARGSUSED*/
77: int
78: mmclose(dev, flag, mode, p)
79: dev_t dev;
80: int flag, mode;
81: struct proc *p;
82: {
83:
84: return (0);
85: }
86:
87: /*ARGSUSED*/
88: int
89: mmrw(dev, uio, flags)
90: dev_t dev;
91: struct uio *uio;
92: int flags;
93: {
94: vaddr_t o, v;
95: int c;
96: struct iovec *iov;
97: int error = 0;
98: static int physlock = 0;
99: extern caddr_t vmmap;
100:
101: if (minor(dev) == 0) {
102: /* lock against other uses of shared vmmap */
103: while (physlock > 0) {
104: physlock++;
105: error = tsleep((caddr_t)&physlock, PZERO | PCATCH,
106: "mmrw", 0);
107: if (error)
108: return (error);
109: }
110: physlock = 1;
111: }
112: while (uio->uio_resid > 0 && error == 0) {
113: iov = uio->uio_iov;
114: if (iov->iov_len == 0) {
115: uio->uio_iov++;
116: uio->uio_iovcnt--;
117: if (uio->uio_iovcnt < 0)
118: panic("mmrw");
119: continue;
120: }
121: switch (minor(dev)) {
122:
123: /* minor device 0 is physical memory */
124: case 0:
125: /* move one page at a time */
126: v = uio->uio_offset;
127: if (v > last_addr) {
128: error = EFAULT;
129: goto unlock;
130: }
131: pmap_enter(pmap_kernel(), (vaddr_t)vmmap,
132: trunc_page(v),
133: uio->uio_rw == UIO_READ ? VM_PROT_READ : VM_PROT_WRITE,
134: (uio->uio_rw == UIO_READ ? VM_PROT_READ : VM_PROT_WRITE) | PMAP_WIRED);
135: pmap_update(pmap_kernel());
136: o = uio->uio_offset & PGOFSET;
137: c = min(uio->uio_resid, (int)(NBPG - o));
138: error = uiomove((caddr_t)vmmap + o, c, uio);
139: pmap_remove(pmap_kernel(), (vaddr_t)vmmap,
140: (vaddr_t)vmmap + NBPG);
141: pmap_update(pmap_kernel());
142: continue;
143:
144: /* minor device 1 is kernel memory */
145: case 1:
146: v = uio->uio_offset;
147: c = min(iov->iov_len, MAXPHYS);
148: if (!uvm_kernacc((caddr_t)v, c,
149: uio->uio_rw == UIO_READ ? B_READ : B_WRITE))
150: return (EFAULT);
151: if (v < NBPG) {
152: #ifdef DEBUG
153: /*
154: * For now, return zeros on read of page 0
155: * and EFAULT for writes.
156: */
157: if (uio->uio_rw == UIO_READ) {
158: if (zeropage == NULL) {
159: zeropage = (caddr_t)
160: malloc(PAGE_SIZE, M_TEMP,
161: M_WAITOK);
162: bzero(zeropage, PAGE_SIZE);
163: }
164: c = min(c, NBPG - (int)v);
165: v = (vaddr_t)zeropage;
166: } else
167: #endif
168: return (EFAULT);
169: }
170: error = uiomove((caddr_t)v, c, uio);
171: continue;
172:
173: /* minor device 2 is EOF/RATHOLE */
174: case 2:
175: if (uio->uio_rw == UIO_WRITE)
176: uio->uio_resid = 0;
177: return (0);
178:
179: /* should add vme bus so that we can do user level probes */
180:
181: /* minor device 12 (/dev/zero) is source of nulls on read, rathole on write */
182: case 12:
183: if (uio->uio_rw == UIO_WRITE) {
184: c = iov->iov_len;
185: break;
186: }
187: if (zeropage == NULL) {
188: zeropage = (caddr_t)
189: malloc(PAGE_SIZE, M_TEMP, M_WAITOK);
190: bzero(zeropage, PAGE_SIZE);
191: }
192: c = min(iov->iov_len, PAGE_SIZE);
193: error = uiomove(zeropage, c, uio);
194: continue;
195:
196: default:
197: return (ENXIO);
198: }
199: if (error)
200: break;
201: iov->iov_base += c;
202: iov->iov_len -= c;
203: uio->uio_offset += c;
204: uio->uio_resid -= c;
205: }
206: if (minor(dev) == 0) {
207: unlock:
208: if (physlock > 1)
209: wakeup((caddr_t)&physlock);
210: physlock = 0;
211: }
212: return (error);
213: }
214:
215: paddr_t
216: mmmmap(dev, off, prot)
217: dev_t dev;
218: off_t off;
219: int prot;
220: {
221: return (-1);
222: }
223:
224: /*ARGSUSED*/
225: int
226: mmioctl(dev, cmd, data, flags, p)
227: dev_t dev;
228: u_long cmd;
229: caddr_t data;
230: int flags;
231: struct proc *p;
232: {
233: return (EOPNOTSUPP);
234: }