Annotation of sys/arch/sh/sh/mem.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: mem.c,v 1.2 2006/12/05 19:55:43 drahn Exp $ */
2: /* $NetBSD: mem.c,v 1.21 2006/07/23 22:06:07 ad Exp $ */
3:
4: /*
5: * Copyright (c) 2002 The NetBSD Foundation, Inc.
6: * All rights reserved.
7: * Copyright (c) 1982, 1986, 1990, 1993
8: * The Regents of the University of California. All rights reserved.
9: *
10: * This code is derived from software contributed to Berkeley by
11: * the Systems Programming Group of the University of Utah Computer
12: * Science Department.
13: *
14: * Redistribution and use in source and binary forms, with or without
15: * modification, are permitted provided that the following conditions
16: * are met:
17: * 1. Redistributions of source code must retain the above copyright
18: * notice, this list of conditions and the following disclaimer.
19: * 2. Redistributions in binary form must reproduce the above copyright
20: * notice, this list of conditions and the following disclaimer in the
21: * documentation and/or other materials provided with the distribution.
22: * 3. Neither the name of the University nor the names of its contributors
23: * may be used to endorse or promote products derived from this software
24: * without specific prior written permission.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36: * SUCH DAMAGE.
37: *
38: * @(#)mem.c 8.3 (Berkeley) 1/12/94
39: */
40:
41: /*
42: * Copyright (c) 1988 University of Utah.
43: *
44: * This code is derived from software contributed to Berkeley by
45: * the Systems Programming Group of the University of Utah Computer
46: * Science Department.
47: *
48: * Redistribution and use in source and binary forms, with or without
49: * modification, are permitted provided that the following conditions
50: * are met:
51: * 1. Redistributions of source code must retain the above copyright
52: * notice, this list of conditions and the following disclaimer.
53: * 2. Redistributions in binary form must reproduce the above copyright
54: * notice, this list of conditions and the following disclaimer in the
55: * documentation and/or other materials provided with the distribution.
56: * 3. All advertising materials mentioning features or use of this software
57: * must display the following acknowledgement:
58: * This product includes software developed by the University of
59: * California, Berkeley and its contributors.
60: * 4. Neither the name of the University nor the names of its contributors
61: * may be used to endorse or promote products derived from this software
62: * without specific prior written permission.
63: *
64: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
65: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
66: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
67: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
68: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
69: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
70: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
71: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
72: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
73: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
74: * SUCH DAMAGE.
75: *
76: * @(#)mem.c 8.3 (Berkeley) 1/12/94
77: */
78:
79: /*
80: * Memory special file
81: */
82:
83: #include <sys/param.h>
84: #include <sys/systm.h>
85: #include <sys/buf.h>
86: #include <sys/uio.h>
87: #include <sys/malloc.h>
88: #include <sys/proc.h>
89: #include <sys/conf.h>
90:
91: #include <uvm/uvm_extern.h>
92:
93: caddr_t zeropage;
94: boolean_t __mm_mem_addr(paddr_t);
95:
96: #define mmread mmrw
97: #define mmwrite mmrw
98: cdev_decl(mm);
99:
100: #define DEV_MEM 0
101: #define DEV_KMEM 1
102: #define DEV_NULL 2
103: #define DEV_ZERO 12
104:
105: /* ARGSUSED */
106: int
107: mmopen(dev_t dev, int flag, int mode, struct proc *p)
108: {
109: switch (minor(dev)) {
110: case DEV_MEM:
111: case DEV_KMEM:
112: case DEV_NULL:
113: case DEV_ZERO:
114: break;
115: default:
116: return (ENXIO);
117: }
118:
119: return (0);
120: }
121:
122: /*ARGSUSED*/
123: int
124: mmclose(dev_t dev, int flag, int mode, struct proc *p)
125: {
126: return (0);
127: }
128:
129: /*ARGSUSED*/
130: int
131: mmrw(dev_t dev, struct uio *uio, int flags)
132: {
133: struct iovec *iov;
134: vaddr_t v, o;
135: int c;
136: int error = 0;
137:
138: while (uio->uio_resid > 0 && !error) {
139: iov = uio->uio_iov;
140: if (iov->iov_len == 0) {
141: uio->uio_iov++;
142: uio->uio_iovcnt--;
143: if (uio->uio_iovcnt < 0)
144: panic("mmrw");
145: continue;
146: }
147:
148: v = uio->uio_offset;
149:
150: switch (minor(dev)) {
151: case DEV_MEM:
152: /* Physical address */
153: if (__mm_mem_addr(v)) {
154: o = v & PGOFSET;
155: c = min(uio->uio_resid, (int)(PAGE_SIZE - o));
156: error = uiomove((caddr_t)SH3_PHYS_TO_P1SEG(v),
157: c, uio);
158: } else {
159: return (EFAULT);
160: }
161: break;
162:
163: case DEV_KMEM:
164: if (v < SH3_P1SEG_BASE) /* P0 */
165: return (EFAULT);
166: if (v < SH3_P2SEG_BASE) { /* P1 */
167: /* permitted */
168: /*
169: if (__mm_mem_addr(SH3_P1SEG_TO_PHYS(v))
170: == FALSE)
171: return (EFAULT);
172: */
173: c = min(iov->iov_len, MAXPHYS);
174: error = uiomove((caddr_t)v, c, uio);
175: } else if (v < SH3_P3SEG_BASE) /* P2 */
176: return (EFAULT);
177: else { /* P3 */
178: c = min(iov->iov_len, MAXPHYS);
179: if (!uvm_kernacc((void *)v, c,
180: uio->uio_rw == UIO_READ ? B_READ : B_WRITE))
181: return (EFAULT);
182: error = uiomove((caddr_t)v, c, uio);
183: }
184: break;
185:
186: case DEV_NULL:
187: if (uio->uio_rw == UIO_WRITE)
188: uio->uio_resid = 0;
189: return (0);
190:
191: case DEV_ZERO:
192: if (uio->uio_rw == UIO_WRITE) {
193: uio->uio_resid = 0;
194: return (0);
195: }
196: if (zeropage == NULL) {
197: zeropage = malloc(PAGE_SIZE, M_TEMP, M_WAITOK);
198: memset(zeropage, 0, PAGE_SIZE);
199: }
200: c = min(iov->iov_len, PAGE_SIZE);
201: error = uiomove(zeropage, c, uio);
202: break;
203:
204: default:
205: return (ENXIO);
206: }
207: }
208:
209: return (error);
210: }
211:
212: /*ARGSUSED*/
213: paddr_t
214: mmmmap(dev_t dev, off_t off, int prot)
215: {
216: struct proc *p = curproc;
217:
218: if (minor(dev) != DEV_MEM)
219: return (-1);
220:
221: if (__mm_mem_addr((paddr_t)off) == FALSE && suser(p, 0) != 0)
222: return (-1);
223: return (atop((paddr_t)off));
224: }
225:
226: /*ARGSUSED*/
227: int
228: mmioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p)
229: {
230: return (EOPNOTSUPP);
231: }
232:
233: /*
234: * boolean_t __mm_mem_addr(paddr_t pa):
235: * Check specified physical address is in physical memory, with the
236: * kernel image off-limits.
237: */
238: boolean_t
239: __mm_mem_addr(paddr_t pa)
240: {
241: #if 0
242: extern vaddr_t kernend; /* from machdep.c */
243: #endif
244: struct vm_physseg *seg;
245: unsigned int segno;
246:
247: for (segno = 0, seg = vm_physmem; segno < vm_nphysseg; segno++, seg++) {
248: if (pa < seg->start || pa >= seg->end)
249: continue;
250:
251: #if 0
252: /*
253: * This assumes the kernel image occupies the beginning of a
254: * memory segment.
255: */
256: if (kernend >= seg->start && kernend < seg->end) {
257: if (pa < kernend)
258: return (FALSE);
259: }
260: #endif
261:
262: return (TRUE);
263: }
264:
265: return (FALSE);
266: }
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