1 | /* $NetBSD: criov.c,v 1.8 2011/02/24 19:28:03 drochner Exp $ */ |
2 | /* $OpenBSD: criov.c,v 1.11 2002/06/10 19:36:43 espie Exp $ */ |
3 | |
4 | /* |
5 | * Copyright (c) 1999 Theo de Raadt |
6 | * |
7 | * Redistribution and use in source and binary forms, with or without |
8 | * modification, are permitted provided that the following conditions |
9 | * are met: |
10 | * |
11 | * 1. Redistributions of source code must retain the above copyright |
12 | * notice, this list of conditions and the following disclaimer. |
13 | * 2. Redistributions in binary form must reproduce the above copyright |
14 | * notice, this list of conditions and the following disclaimer in the |
15 | * documentation and/or other materials provided with the distribution. |
16 | * 3. The name of the author may not be used to endorse or promote products |
17 | * derived from this software without specific prior written permission. |
18 | * |
19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
20 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
21 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
22 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
23 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
24 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
25 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
26 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
27 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
28 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
29 | */ |
30 | |
31 | #include <sys/cdefs.h> |
32 | __KERNEL_RCSID(0, "$NetBSD: criov.c,v 1.8 2011/02/24 19:28:03 drochner Exp $" ); |
33 | |
34 | #include <sys/param.h> |
35 | #include <sys/systm.h> |
36 | #include <sys/proc.h> |
37 | #include <sys/errno.h> |
38 | #include <sys/malloc.h> |
39 | #include <sys/kernel.h> |
40 | #include <sys/mbuf.h> |
41 | |
42 | #include <uvm/uvm_extern.h> |
43 | |
44 | #include <opencrypto/cryptodev.h> |
45 | int cuio_getindx(struct uio *uio, int loc, int *off); |
46 | |
47 | |
48 | void |
49 | cuio_copydata(struct uio *uio, int off, int len, void *cp) |
50 | { |
51 | struct iovec *iov = uio->uio_iov; |
52 | int iol = uio->uio_iovcnt; |
53 | unsigned count; |
54 | |
55 | if (off < 0) |
56 | panic("cuio_copydata: off %d < 0" , off); |
57 | if (len < 0) |
58 | panic("cuio_copydata: len %d < 0" , len); |
59 | while (off > 0) { |
60 | if (iol == 0) |
61 | panic("iov_copydata: empty in skip" ); |
62 | if (off < iov->iov_len) |
63 | break; |
64 | off -= iov->iov_len; |
65 | iol--; |
66 | iov++; |
67 | } |
68 | while (len > 0) { |
69 | if (iol == 0) |
70 | panic("cuio_copydata: empty" ); |
71 | count = min(iov->iov_len - off, len); |
72 | memcpy(cp, (char *)iov->iov_base + off, count); |
73 | len -= count; |
74 | cp = (char *)cp + count; |
75 | off = 0; |
76 | iol--; |
77 | iov++; |
78 | } |
79 | } |
80 | |
81 | void |
82 | cuio_copyback(struct uio *uio, int off, int len, void *cp) |
83 | { |
84 | struct iovec *iov = uio->uio_iov; |
85 | int iol = uio->uio_iovcnt; |
86 | unsigned count; |
87 | |
88 | if (off < 0) |
89 | panic("cuio_copyback: off %d < 0" , off); |
90 | if (len < 0) |
91 | panic("cuio_copyback: len %d < 0" , len); |
92 | while (off > 0) { |
93 | if (iol == 0) { |
94 | #ifdef DEBUG |
95 | printf("cuio_copyback: empty in skip\n" ); |
96 | #endif |
97 | return; |
98 | } |
99 | if (off < iov->iov_len) |
100 | break; |
101 | off -= iov->iov_len; |
102 | iol--; |
103 | iov++; |
104 | } |
105 | while (len > 0) { |
106 | if (iol == 0) { |
107 | #ifdef DEBUG |
108 | printf("uio_copyback: empty\n" ); |
109 | #endif |
110 | return; |
111 | } |
112 | count = min(iov->iov_len - off, len); |
113 | memcpy((char *)iov->iov_base + off, cp, count); |
114 | len -= count; |
115 | cp = (char *)cp + count; |
116 | off = 0; |
117 | iol--; |
118 | iov++; |
119 | } |
120 | } |
121 | |
122 | /* |
123 | * Return a pointer to iov/offset of location in iovec list. |
124 | */ |
125 | |
126 | int |
127 | cuio_getptr(struct uio *uio, int loc, int *off) |
128 | { |
129 | int ind, len; |
130 | |
131 | ind = 0; |
132 | while (loc >= 0 && ind < uio->uio_iovcnt) { |
133 | len = uio->uio_iov[ind].iov_len; |
134 | if (len > loc) { |
135 | *off = loc; |
136 | return (ind); |
137 | } |
138 | loc -= len; |
139 | ind++; |
140 | } |
141 | |
142 | if (ind > 0 && loc == 0) { |
143 | ind--; |
144 | *off = uio->uio_iov[ind].iov_len; |
145 | return (ind); |
146 | } |
147 | |
148 | return (-1); |
149 | } |
150 | |
151 | int |
152 | cuio_apply(struct uio *uio, int off, int len, |
153 | int (*f)(void *, void *, unsigned int), void *fstate) |
154 | { |
155 | int rval, ind, uiolen; |
156 | unsigned int count; |
157 | |
158 | if (len < 0) |
159 | panic("%s: len %d < 0" , __func__, len); |
160 | if (off < 0) |
161 | panic("%s: off %d < 0" , __func__, off); |
162 | |
163 | ind = 0; |
164 | while (off > 0) { |
165 | if (ind >= uio->uio_iovcnt) |
166 | panic("cuio_apply: out of ivecs before data in uio" ); |
167 | uiolen = uio->uio_iov[ind].iov_len; |
168 | if (off < uiolen) |
169 | break; |
170 | off -= uiolen; |
171 | ind++; |
172 | } |
173 | while (len > 0) { |
174 | if (ind >= uio->uio_iovcnt) |
175 | panic("cuio_apply: out of ivecs when processing uio" ); |
176 | count = min(uio->uio_iov[ind].iov_len - off, len); |
177 | |
178 | rval = f(fstate, |
179 | ((char *)uio->uio_iov[ind].iov_base + off), count); |
180 | if (rval) |
181 | return (rval); |
182 | |
183 | len -= count; |
184 | off = 0; |
185 | ind++; |
186 | } |
187 | |
188 | return (0); |
189 | } |
190 | |