b43: Remove unnecessary MMIO accesses in the interrupt hotpath.
[openwrt.git] / target / linux / generic-2.6 / files / crypto / ocf / criov.c
1 /* $OpenBSD: criov.c,v 1.9 2002/01/29 15:48:29 jason Exp $ */
2
3 /*
4 * Linux port done by David McCullough <david_mccullough@securecomputing.com>
5 * Copyright (C) 2006-2007 David McCullough
6 * Copyright (C) 2004-2005 Intel Corporation.
7 * The license and original author are listed below.
8 *
9 * Copyright (c) 1999 Theo de Raadt
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 *
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. The name of the author may not be used to endorse or promote products
21 * derived from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 *
34 __FBSDID("$FreeBSD: src/sys/opencrypto/criov.c,v 1.5 2006/06/04 22:15:13 pjd Exp $");
35 */
36
37 #ifndef AUTOCONF_INCLUDED
38 #include <linux/config.h>
39 #endif
40 #include <linux/module.h>
41 #include <linux/init.h>
42 #include <linux/slab.h>
43 #include <linux/uio.h>
44 #include <linux/skbuff.h>
45 #include <linux/kernel.h>
46 #include <linux/mm.h>
47 #include <asm/io.h>
48
49 #include <uio.h>
50 #include <cryptodev.h>
51
52 /*
53 * This macro is only for avoiding code duplication, as we need to skip
54 * given number of bytes in the same way in three functions below.
55 */
56 #define CUIO_SKIP() do { \
57 KASSERT(off >= 0, ("%s: off %d < 0", __func__, off)); \
58 KASSERT(len >= 0, ("%s: len %d < 0", __func__, len)); \
59 while (off > 0) { \
60 KASSERT(iol >= 0, ("%s: empty in skip", __func__)); \
61 if (off < iov->iov_len) \
62 break; \
63 off -= iov->iov_len; \
64 iol--; \
65 iov++; \
66 } \
67 } while (0)
68
69 void
70 cuio_copydata(struct uio* uio, int off, int len, caddr_t cp)
71 {
72 struct iovec *iov = uio->uio_iov;
73 int iol = uio->uio_iovcnt;
74 unsigned count;
75
76 CUIO_SKIP();
77 while (len > 0) {
78 KASSERT(iol >= 0, ("%s: empty", __func__));
79 count = min((int)(iov->iov_len - off), len);
80 memcpy(cp, ((caddr_t)iov->iov_base) + off, count);
81 len -= count;
82 cp += count;
83 off = 0;
84 iol--;
85 iov++;
86 }
87 }
88
89 void
90 cuio_copyback(struct uio* uio, int off, int len, caddr_t cp)
91 {
92 struct iovec *iov = uio->uio_iov;
93 int iol = uio->uio_iovcnt;
94 unsigned count;
95
96 CUIO_SKIP();
97 while (len > 0) {
98 KASSERT(iol >= 0, ("%s: empty", __func__));
99 count = min((int)(iov->iov_len - off), len);
100 memcpy(((caddr_t)iov->iov_base) + off, cp, count);
101 len -= count;
102 cp += count;
103 off = 0;
104 iol--;
105 iov++;
106 }
107 }
108
109 /*
110 * Return a pointer to iov/offset of location in iovec list.
111 */
112 struct iovec *
113 cuio_getptr(struct uio *uio, int loc, int *off)
114 {
115 struct iovec *iov = uio->uio_iov;
116 int iol = uio->uio_iovcnt;
117
118 while (loc >= 0) {
119 /* Normal end of search */
120 if (loc < iov->iov_len) {
121 *off = loc;
122 return (iov);
123 }
124
125 loc -= iov->iov_len;
126 if (iol == 0) {
127 if (loc == 0) {
128 /* Point at the end of valid data */
129 *off = iov->iov_len;
130 return (iov);
131 } else
132 return (NULL);
133 } else {
134 iov++, iol--;
135 }
136 }
137
138 return (NULL);
139 }
140
141 EXPORT_SYMBOL(cuio_copyback);
142 EXPORT_SYMBOL(cuio_copydata);
143 EXPORT_SYMBOL(cuio_getptr);
144
145
146 static void
147 skb_copy_bits_back(struct sk_buff *skb, int offset, caddr_t cp, int len)
148 {
149 int i;
150 if (offset < skb_headlen(skb)) {
151 memcpy(skb->data + offset, cp, min_t(int, skb_headlen(skb), len));
152 len -= skb_headlen(skb);
153 cp += skb_headlen(skb);
154 }
155 offset -= skb_headlen(skb);
156 for (i = 0; len > 0 && i < skb_shinfo(skb)->nr_frags; i++) {
157 if (offset < skb_shinfo(skb)->frags[i].size) {
158 memcpy(page_address(skb_shinfo(skb)->frags[i].page) +
159 skb_shinfo(skb)->frags[i].page_offset,
160 cp, min_t(int, skb_shinfo(skb)->frags[i].size, len));
161 len -= skb_shinfo(skb)->frags[i].size;
162 cp += skb_shinfo(skb)->frags[i].size;
163 }
164 offset -= skb_shinfo(skb)->frags[i].size;
165 }
166 }
167
168 void
169 crypto_copyback(int flags, caddr_t buf, int off, int size, caddr_t in)
170 {
171
172 if ((flags & CRYPTO_F_SKBUF) != 0)
173 skb_copy_bits_back((struct sk_buff *)buf, off, in, size);
174 else if ((flags & CRYPTO_F_IOV) != 0)
175 cuio_copyback((struct uio *)buf, off, size, in);
176 else
177 bcopy(in, buf + off, size);
178 }
179
180 void
181 crypto_copydata(int flags, caddr_t buf, int off, int size, caddr_t out)
182 {
183
184 if ((flags & CRYPTO_F_SKBUF) != 0)
185 skb_copy_bits((struct sk_buff *)buf, off, out, size);
186 else if ((flags & CRYPTO_F_IOV) != 0)
187 cuio_copydata((struct uio *)buf, off, size, out);
188 else
189 bcopy(buf + off, out, size);
190 }
191
192 int
193 crypto_apply(int flags, caddr_t buf, int off, int len,
194 int (*f)(void *, void *, u_int), void *arg)
195 {
196 #if 0
197 int error;
198
199 if ((flags & CRYPTO_F_SKBUF) != 0)
200 error = XXXXXX((struct mbuf *)buf, off, len, f, arg);
201 else if ((flags & CRYPTO_F_IOV) != 0)
202 error = cuio_apply((struct uio *)buf, off, len, f, arg);
203 else
204 error = (*f)(arg, buf + off, len);
205 return (error);
206 #else
207 KASSERT(0, ("crypto_apply not implemented!\n"));
208 #endif
209 return 0;
210 }
211
212 EXPORT_SYMBOL(crypto_copyback);
213 EXPORT_SYMBOL(crypto_copydata);
214 EXPORT_SYMBOL(crypto_apply);
215
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