Annotation of sys/arch/arm/arm/mem.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: mem.c,v 1.6 2006/11/29 13:28:45 miod Exp $ */
2: /* $NetBSD: mem.c,v 1.11 2003/10/16 12:02:58 jdolecek Exp $ */
3:
4: /*
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: /*
37: * Copyright (c) 1988 University of Utah.
38: *
39: * This code is derived from software contributed to Berkeley by
40: * the Systems Programming Group of the University of Utah Computer
41: * Science Department.
42: *
43: * Redistribution and use in source and binary forms, with or without
44: * modification, are permitted provided that the following conditions
45: * are met:
46: * 1. Redistributions of source code must retain the above copyright
47: * notice, this list of conditions and the following disclaimer.
48: * 2. Redistributions in binary form must reproduce the above copyright
49: * notice, this list of conditions and the following disclaimer in the
50: * documentation and/or other materials provided with the distribution.
51: * 3. All advertising materials mentioning features or use of this software
52: * must display the following acknowledgement:
53: * This product includes software developed by the University of
54: * California, Berkeley and its contributors.
55: * 4. Neither the name of the University nor the names of its contributors
56: * may be used to endorse or promote products derived from this software
57: * without specific prior written permission.
58: *
59: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
60: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
61: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
62: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
63: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
64: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
65: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
66: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
67: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
68: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
69: * SUCH DAMAGE.
70: */
71:
72: /*
73: * Memory special file
74: */
75:
76: #include <sys/param.h>
77: #include <sys/conf.h>
78: #include <sys/buf.h>
79: #include <sys/systm.h>
80: #include <sys/uio.h>
81: #include <sys/malloc.h>
82: #include <sys/proc.h>
83: #include <sys/fcntl.h>
84:
85: #include <machine/cpu.h>
86: #include <arm/conf.h>
87:
88: #include <uvm/uvm_extern.h>
89:
90: extern char *memhook; /* poor name! */
91: caddr_t zeropage;
92: int physlock;
93:
94: /* open counter for aperture */
95: #ifdef APERTURE
96: static int ap_open_count = 0;
97: extern int allowaperture;
98: #endif
99:
100:
101: /*ARGSUSED*/
102: int
103: mmopen(dev, flag, mode, p)
104: dev_t dev;
105: int flag, mode;
106: struct proc *p;
107: {
108: switch (minor(dev)) {
109: case 0:
110: case 1:
111: case 2:
112: case 12:
113: break;
114: #ifdef APERTURE
115: case 4:
116: if (suser(p, 0) != 0 || !allowaperture)
117: return (EPERM);
118:
119: /* authorize only one simultaneous open() */
120: if (ap_open_count > 0)
121: return(EPERM);
122: ap_open_count++;
123: break;
124: #endif
125: default:
126: return (ENXIO);
127: }
128: return (0);
129: }
130:
131: /*ARGSUSED*/
132: int
133: mmclose(dev, flag, mode, p)
134: dev_t dev;
135: int flag, mode;
136: struct proc *p;
137: {
138: #ifdef APERTURE
139: if (minor(dev) == 4)
140: ap_open_count--;
141: #endif
142: return (0);
143: }
144: #define DEV_MEM 0
145: #define DEV_KMEM 1
146: #define DEV_NULL 2
147: #define DEV_ZERO 12
148:
149: /*ARGSUSED*/
150: int
151: mmrw(dev, uio, flags)
152: dev_t dev;
153: struct uio *uio;
154: int flags;
155: {
156: register vaddr_t o, v;
157: register int c;
158: register struct iovec *iov;
159: int error = 0;
160: vm_prot_t prot;
161:
162: if (minor(dev) == DEV_MEM) {
163: /* lock against other uses of shared vmmap */
164: while (physlock > 0) {
165: physlock++;
166: error = tsleep((caddr_t)&physlock, PZERO | PCATCH,
167: "mmrw", 0);
168: if (error)
169: return (error);
170: }
171: physlock = 1;
172: }
173: while (uio->uio_resid > 0 && error == 0) {
174: iov = uio->uio_iov;
175: if (iov->iov_len == 0) {
176: uio->uio_iov++;
177: uio->uio_iovcnt--;
178: if (uio->uio_iovcnt < 0)
179: panic("mmrw");
180: continue;
181: }
182: switch (minor(dev)) {
183:
184: case DEV_MEM:
185: v = uio->uio_offset;
186: prot = uio->uio_rw == UIO_READ ? VM_PROT_READ :
187: VM_PROT_WRITE;
188: pmap_enter(pmap_kernel(), (vaddr_t)memhook,
189: trunc_page(v), prot, prot|PMAP_WIRED);
190: pmap_update(pmap_kernel());
191: o = uio->uio_offset & PGOFSET;
192: c = min(uio->uio_resid, (int)(PAGE_SIZE - o));
193: error = uiomove((caddr_t)memhook + o, c, uio);
194: pmap_remove(pmap_kernel(), (vaddr_t)memhook,
195: (vaddr_t)memhook + PAGE_SIZE);
196: pmap_update(pmap_kernel());
197: break;
198:
199: case DEV_KMEM:
200: v = uio->uio_offset;
201: c = min(iov->iov_len, MAXPHYS);
202: if (!uvm_kernacc((caddr_t)v, c,
203: uio->uio_rw == UIO_READ ? B_READ : B_WRITE))
204: return (EFAULT);
205: error = uiomove((caddr_t)v, c, uio);
206: break;
207:
208: case DEV_NULL:
209: if (uio->uio_rw == UIO_WRITE)
210: uio->uio_resid = 0;
211: return (0);
212:
213: case DEV_ZERO:
214: if (uio->uio_rw == UIO_WRITE) {
215: uio->uio_resid = 0;
216: return (0);
217: }
218: if (zeropage == NULL) {
219: zeropage = (caddr_t)
220: malloc(PAGE_SIZE, M_TEMP, M_WAITOK);
221: memset(zeropage, 0, PAGE_SIZE);
222: }
223: c = min(iov->iov_len, PAGE_SIZE);
224: error = uiomove(zeropage, c, uio);
225: break;
226:
227: default:
228: return (ENXIO);
229: }
230: }
231: if (minor(dev) == DEV_MEM) {
232: /*unlock:*/
233: if (physlock > 1)
234: wakeup((caddr_t)&physlock);
235: physlock = 0;
236: }
237: return (error);
238: }
239:
240: paddr_t
241: mmmmap(dev, off, prot)
242: dev_t dev;
243: off_t off;
244: int prot;
245: {
246: struct proc *p = curproc; /* XXX */
247:
248: /*
249: * /dev/mem is the only one that makes sense through this
250: * interface. For /dev/kmem any physaddr we return here
251: * could be transient and hence incorrect or invalid at
252: * a later time. /dev/null just doesn't make any sense
253: * and /dev/zero is a hack that is handled via the default
254: * pager in mmap().
255: */
256: if (minor(dev) != DEV_MEM)
257: return (-1);
258:
259: /* minor device 0 is physical memory */
260:
261: if ((paddr_t)off >= ctob((paddr_t)physmem) &&
262: suser(p, 0) != 0)
263: return -1;
264: return atop(off);
265: }
266: /*ARGSUSED*/
267: int
268: mmioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p)
269: {
270: return (EOPNOTSUPP);
271: }
272:
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