1 /* $OpenBSD: criov.c,v 1.14 2003/08/14 15:18:05 jason Exp $ */
2
3 /*
4 * Copyright (c) 1999 Theo de Raadt
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include <sys/param.h>
29 #include <sys/systm.h>
30 #include <sys/proc.h>
31 #include <sys/errno.h>
32 #include <sys/malloc.h>
33 #include <sys/kernel.h>
34 #include <sys/mbuf.h>
35
36 #include <uvm/uvm_extern.h>
37
38 #include <crypto/cryptodev.h>
39
40 void
cuio_copydata(struct uio * uio,int off,int len,caddr_t cp)41 cuio_copydata(struct uio *uio, int off, int len, caddr_t cp)
42 {
43 struct iovec *iov = uio->uio_iov;
44 int iol = uio->uio_iovcnt;
45 unsigned count;
46
47 if (off < 0)
48 panic("cuio_copydata: off %d < 0", off);
49 if (len < 0)
50 panic("cuio_copydata: len %d < 0", len);
51 while (off > 0) {
52 if (iol == 0)
53 panic("iov_copydata: empty in skip");
54 if (off < iov->iov_len)
55 break;
56 off -= iov->iov_len;
57 iol--;
58 iov++;
59 }
60 while (len > 0) {
61 if (iol == 0)
62 panic("cuio_copydata: empty");
63 count = min(iov->iov_len - off, len);
64 bcopy(((caddr_t)iov->iov_base) + off, cp, count);
65 len -= count;
66 cp += count;
67 off = 0;
68 iol--;
69 iov++;
70 }
71 }
72
73 void
cuio_copyback(struct uio * uio,int off,int len,const void * cp)74 cuio_copyback(struct uio *uio, int off, int len, const void *cp)
75 {
76 struct iovec *iov = uio->uio_iov;
77 int iol = uio->uio_iovcnt;
78 unsigned count;
79
80 if (off < 0)
81 panic("cuio_copyback: off %d < 0", off);
82 if (len < 0)
83 panic("cuio_copyback: len %d < 0", len);
84 while (off > 0) {
85 if (iol == 0)
86 panic("cuio_copyback: empty in skip");
87 if (off < iov->iov_len)
88 break;
89 off -= iov->iov_len;
90 iol--;
91 iov++;
92 }
93 while (len > 0) {
94 if (iol == 0)
95 panic("uio_copyback: empty");
96 count = min(iov->iov_len - off, len);
97 bcopy(cp, ((caddr_t)iov->iov_base) + off, count);
98 len -= count;
99 cp += count;
100 off = 0;
101 iol--;
102 iov++;
103 }
104 }
105
106 int
cuio_getptr(struct uio * uio,int loc,int * off)107 cuio_getptr(struct uio *uio, int loc, int *off)
108 {
109 int ind, len;
110
111 ind = 0;
112 while (loc >= 0 && ind < uio->uio_iovcnt) {
113 len = uio->uio_iov[ind].iov_len;
114 if (len > loc) {
115 *off = loc;
116 return (ind);
117 }
118 loc -= len;
119 ind++;
120 }
121
122 if (ind > 0 && loc == 0) {
123 ind--;
124 *off = uio->uio_iov[ind].iov_len;
125 return (ind);
126 }
127
128 return (-1);
129 }
130
131 int
cuio_apply(struct uio * uio,int off,int len,int (* f)(caddr_t,caddr_t,unsigned int),caddr_t fstate)132 cuio_apply(struct uio *uio, int off, int len,
133 int (*f)(caddr_t, caddr_t, unsigned int), caddr_t fstate)
134 {
135 int rval, ind, uiolen;
136 unsigned int count;
137
138 if (len < 0)
139 panic("cuio_apply: len %d < 0", len);
140 if (off < 0)
141 panic("cuio_apply: off %d < 0", off);
142
143 ind = 0;
144 while (off > 0) {
145 if (ind >= uio->uio_iovcnt)
146 panic("cui_apply: ind %d >= uio_iovcnt %d for off",
147 ind, uio->uio_iovcnt);
148 uiolen = uio->uio_iov[ind].iov_len;
149 if (off < uiolen)
150 break;
151 off -= uiolen;
152 ind++;
153 }
154 while (len > 0) {
155 if (ind >= uio->uio_iovcnt)
156 panic("cui_apply: ind %d >= uio_iovcnt %d for len",
157 ind, uio->uio_iovcnt);
158 count = min(uio->uio_iov[ind].iov_len - off, len);
159
160 rval = f(fstate, uio->uio_iov[ind].iov_base + off, count);
161 if (rval)
162 return (rval);
163
164 len -= count;
165 off = 0;
166 ind++;
167 }
168
169 return (0);
170 }
171