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-rw-r--r--arch/microblaze/lib/checksum.c172
1 files changed, 0 insertions, 172 deletions
diff --git a/arch/microblaze/lib/checksum.c b/arch/microblaze/lib/checksum.c
deleted file mode 100644
index f08e74591418..000000000000
--- a/arch/microblaze/lib/checksum.c
+++ /dev/null
@@ -1,172 +0,0 @@
1/*
2 *
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * IP/TCP/UDP checksumming routines
8 *
9 * Authors: Jorge Cwik, <jorge@laser.satlink.net>
10 * Arnt Gulbrandsen, <agulbra@nvg.unit.no>
11 * Tom May, <ftom@netcom.com>
12 * Andreas Schwab, <schwab@issan.informatik.uni-dortmund.de>
13 * Lots of code moved from tcp.c and ip.c; see those files
14 * for more names.
15 *
16 * 03/02/96 Jes Sorensen, Andreas Schwab, Roman Hodek:
17 * Fixed some nasty bugs, causing some horrible crashes.
18 * A: At some points, the sum (%0) was used as
19 * length-counter instead of the length counter
20 * (%1). Thanks to Roman Hodek for pointing this out.
21 * B: GCC seems to mess up if one uses too many
22 * data-registers to hold input values and one tries to
23 * specify d0 and d1 as scratch registers. Letting gcc
24 * choose these registers itself solves the problem.
25 *
26 * This program is free software; you can redistribute it and/or
27 * modify it under the terms of the GNU General Public License
28 * as published by the Free Software Foundation; either version
29 * 2 of the License, or (at your option) any later version.
30 */
31
32/* Revised by Kenneth Albanowski for m68knommu. Basic problem: unaligned access
33 kills, so most of the assembly has to go. */
34
35#include <linux/module.h>
36#include <net/checksum.h>
37
38#include <asm/byteorder.h>
39
40static inline unsigned short from32to16(unsigned long x)
41{
42 /* add up 16-bit and 16-bit for 16+c bit */
43 x = (x & 0xffff) + (x >> 16);
44 /* add up carry.. */
45 x = (x & 0xffff) + (x >> 16);
46 return x;
47}
48
49static unsigned int do_csum(const unsigned char *buff, int len)
50{
51 int odd, count;
52 unsigned long result = 0;
53
54 if (len <= 0)
55 goto out;
56 odd = 1 & (unsigned long) buff;
57 if (odd) {
58 result = *buff;
59 len--;
60 buff++;
61 }
62 count = len >> 1; /* nr of 16-bit words.. */
63 if (count) {
64 if (2 & (unsigned long) buff) {
65 result += *(unsigned short *) buff;
66 count--;
67 len -= 2;
68 buff += 2;
69 }
70 count >>= 1; /* nr of 32-bit words.. */
71 if (count) {
72 unsigned long carry = 0;
73 do {
74 unsigned long w = *(unsigned long *) buff;
75 count--;
76 buff += 4;
77 result += carry;
78 result += w;
79 carry = (w > result);
80 } while (count);
81 result += carry;
82 result = (result & 0xffff) + (result >> 16);
83 }
84 if (len & 2) {
85 result += *(unsigned short *) buff;
86 buff += 2;
87 }
88 }
89 if (len & 1)
90 result += (*buff << 8);
91 result = from32to16(result);
92 if (odd)
93 result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
94out:
95 return result;
96}
97
98/*
99 * This is a version of ip_compute_csum() optimized for IP headers,
100 * which always checksum on 4 octet boundaries.
101 */
102__sum16 ip_fast_csum(const void *iph, unsigned int ihl)
103{
104 return (__force __sum16)~do_csum(iph, ihl*4);
105}
106EXPORT_SYMBOL(ip_fast_csum);
107
108/*
109 * computes the checksum of a memory block at buff, length len,
110 * and adds in "sum" (32-bit)
111 *
112 * returns a 32-bit number suitable for feeding into itself
113 * or csum_tcpudp_magic
114 *
115 * this function must be called with even lengths, except
116 * for the last fragment, which may be odd
117 *
118 * it's best to have buff aligned on a 32-bit boundary
119 */
120__wsum csum_partial(const void *buff, int len, __wsum wsum)
121{
122 unsigned int sum = (__force unsigned int)wsum;
123 unsigned int result = do_csum(buff, len);
124
125 /* add in old sum, and carry.. */
126 result += sum;
127 if (sum > result)
128 result += 1;
129 return (__force __wsum)result;
130}
131EXPORT_SYMBOL(csum_partial);
132
133/*
134 * this routine is used for miscellaneous IP-like checksums, mainly
135 * in icmp.c
136 */
137__sum16 ip_compute_csum(const void *buff, int len)
138{
139 return (__force __sum16)~do_csum(buff, len);
140}
141EXPORT_SYMBOL(ip_compute_csum);
142
143/*
144 * copy from fs while checksumming, otherwise like csum_partial
145 */
146__wsum
147csum_partial_copy_from_user(const void __user *src, void *dst, int len,
148 __wsum sum, int *csum_err)
149{
150 int missing;
151
152 missing = __copy_from_user(dst, src, len);
153 if (missing) {
154 memset(dst + len - missing, 0, missing);
155 *csum_err = -EFAULT;
156 } else
157 *csum_err = 0;
158
159 return csum_partial(dst, len, sum);
160}
161EXPORT_SYMBOL(csum_partial_copy_from_user);
162
163/*
164 * copy from ds while checksumming, otherwise like csum_partial
165 */
166__wsum
167csum_partial_copy(const void *src, void *dst, int len, __wsum sum)
168{
169 memcpy(dst, src, len);
170 return csum_partial(dst, len, sum);
171}
172EXPORT_SYMBOL(csum_partial_copy);
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