![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to mem.c CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [Apple XNU] / XNU / bsd / dev / ppc|
Return to mem.c CVS log | Up to [Apple XNU] / XNU / bsd / dev / ppc |
1.1 root 1: /*
2: * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * The contents of this file constitute Original Code as defined in and
7: * are subject to the Apple Public Source License Version 1.1 (the
8: * "License"). You may not use this file except in compliance with the
9: * License. Please obtain a copy of the License at
10: * http://www.apple.com/publicsource and read it before using this file.
11: *
12: * This Original Code and all software distributed under the License are
13: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
16: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
17: * License for the specific language governing rights and limitations
18: * under the License.
19: *
20: * @APPLE_LICENSE_HEADER_END@
21: */
22: /*-
23: * Copyright (c) 1988 University of Utah.
24: * Copyright (c) 1982, 1986, 1990, 1993
25: * The Regents of the University of California. All rights reserved.
26: *
27: * This code is derived from software contributed to Berkeley by
28: * the Systems Programming Group of the University of Utah Computer
29: * Science Department, and code derived from software contributed to
30: * Berkeley by William Jolitz.
31: *
32: * Redistribution and use in source and binary forms, with or without
33: * modification, are permitted provided that the following conditions
34: * are met:
35: * 1. Redistributions of source code must retain the above copyright
36: * notice, this list of conditions and the following disclaimer.
37: * 2. Redistributions in binary form must reproduce the above copyright
38: * notice, this list of conditions and the following disclaimer in the
39: * documentation and/or other materials provided with the distribution.
40: * 3. All advertising materials mentioning features or use of this software
41: * must display the following acknowledgement:
42: * This product includes software developed by the University of
43: * California, Berkeley and its contributors.
44: * 4. Neither the name of the University nor the names of its contributors
45: * may be used to endorse or promote products derived from this software
46: * without specific prior written permission.
47: *
48: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58: * SUCH DAMAGE.
59: *
60: * from: Utah $Hdr: mem.c 1.13 89/10/08$
61: * @(#)mem.c 8.1 (Berkeley) 6/11/93
62: */
63:
64: #include <mach_load.h>
65:
66: /*
67: * Memory special file
68: */
69:
70: #include <sys/param.h>
71: #include <sys/dir.h>
72: #include <sys/proc.h>
73: #include <sys/buf.h>
74: #include <sys/systm.h>
75: #include <sys/vm.h>
76: #include <sys/uio.h>
77:
78: #include <vm/pmap.h>
79: #include <vm/vm_map.h>
80: #include <vm/vm_kern.h>
81: #include <mach/vm_param.h>
82:
83: #if DEBUG
84: extern void mapping_make(pmap_t pmap, space_t space,
85: struct phys_entry *pp, vm_offset_t va, vm_offset_t pa, vm_prot_t prot, int attr);
86: extern void mapping_remove(space_t space, vm_offset_t va);
87: extern vm_offset_t mem_actual;
88: #endif
89:
90: mmread(dev, uio)
91: dev_t dev;
92: struct uio *uio;
93: {
94:
95: return (mmrw(dev, uio, UIO_READ));
96: }
97:
98: mmwrite(dev, uio)
99: dev_t dev;
100: struct uio *uio;
101: {
102:
103: return (mmrw(dev, uio, UIO_WRITE));
104: }
105:
106: mmrw(dev, uio, rw)
107: dev_t dev;
108: struct uio *uio;
109: enum uio_rw rw;
110: {
111: register int o;
112: register u_int c, v;
113: register struct iovec *iov;
114: int error = 0;
115: vm_offset_t where;
116: int spl;
117: vm_size_t size;
118: extern boolean_t kernacc(off_t, size_t );
119:
120: while (uio->uio_resid > 0 && error == 0) {
121: iov = uio->uio_iov;
122: if (iov->iov_len == 0) {
123: uio->uio_iov++;
124: uio->uio_iovcnt--;
125: if (uio->uio_iovcnt < 0)
126: panic("mmrw");
127: continue;
128: }
129: switch (minor(dev)) {
130:
131: /* minor device 0 is physical memory */
132: case 0:
133: v = trunc_page(uio->uio_offset);
134: #if DEBUG
135: if (uio->uio_offset >= mem_actual)
136: #else
137: if (uio->uio_offset >= mem_size)
138: #endif
139: goto fault;
140:
141: size= PAGE_SIZE;
142: #if DEBUG
143: if (kmem_alloc_pageable(kernel_map, &where, size) != KERN_SUCCESS) {
144: goto fault;
145: }
146: else {
147: (void)mapping_make(0, 0, 0, where, v,
148: VM_PROT_READ, 2); /* Map it in for the moment */
149: }
150: #else
151: if (kmem_alloc(kernel_map, &where, size)
152: != KERN_SUCCESS) {
153: goto fault;
154: }
155: #endif
156: o = uio->uio_offset - v;
157: c = min(PAGE_SIZE - o, (u_int)iov->iov_len);
158: error = uiomove((caddr_t) (where + o), c, uio);
159: #if DEBUG
160: (void)mapping_remove(0, where); /* Unmap it */
161: #endif
162: kmem_free(kernel_map, where, PAGE_SIZE);
163: continue;
164:
165: /* minor device 1 is kernel memory */
166: case 1:
167: /* Do some sanity checking */
168: if (((caddr_t)uio->uio_offset >= VM_MAX_KERNEL_ADDRESS) ||
169: ((caddr_t)uio->uio_offset <= VM_MIN_KERNEL_ADDRESS))
170: goto fault;
171: c = iov->iov_len;
172: if (!kernacc((caddr_t)uio->uio_offset, c))
173: goto fault;
174: error = uiomove((caddr_t)uio->uio_offset, (int)c, uio);
175: continue;
176:
177: /* minor device 2 is EOF/RATHOLE */
178: case 2:
179: if (rw == UIO_READ)
180: return (0);
181: c = iov->iov_len;
182: break;
183: default:
184: goto fault;
185: break;
186: }
187:
188: if (error)
189: break;
190: iov->iov_base += c;
191: iov->iov_len -= c;
192: uio->uio_offset += c;
193: uio->uio_resid -= c;
194: }
195: return (error);
196: fault:
197: return (EFAULT);
198: }
199:
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.