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-rw-r--r--arch/sh/lib64/c-checksum.c214
1 files changed, 0 insertions, 214 deletions
diff --git a/arch/sh/lib64/c-checksum.c b/arch/sh/lib64/c-checksum.c
deleted file mode 100644
index 73c0877e3a29..000000000000
--- a/arch/sh/lib64/c-checksum.c
+++ /dev/null
@@ -1,214 +0,0 @@
1/*
2 * arch/sh/lib64/c-checksum.c
3 *
4 * This file contains network checksum routines that are better done
5 * in an architecture-specific manner due to speed..
6 */
7#include <linux/string.h>
8#include <linux/errno.h>
9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <asm/byteorder.h>
12#include <asm/uaccess.h>
13
14static inline unsigned short from64to16(unsigned long long x)
15{
16 /* add up 32-bit words for 33 bits */
17 x = (x & 0xffffffff) + (x >> 32);
18 /* add up 16-bit and 17-bit words for 17+c bits */
19 x = (x & 0xffff) + (x >> 16);
20 /* add up 16-bit and 2-bit for 16+c bit */
21 x = (x & 0xffff) + (x >> 16);
22 /* add up carry.. */
23 x = (x & 0xffff) + (x >> 16);
24 return x;
25}
26
27static inline unsigned short foldto16(unsigned long x)
28{
29 /* add up 16-bit for 17 bits */
30 x = (x & 0xffff) + (x >> 16);
31 /* add up carry.. */
32 x = (x & 0xffff) + (x >> 16);
33 return x;
34}
35
36static inline unsigned short myfoldto16(unsigned long long x)
37{
38 /* Fold down to 32-bits so we don't lose in the typedef-less
39 network stack. */
40 /* 64 to 33 */
41 x = (x & 0xffffffff) + (x >> 32);
42 /* 33 to 32 */
43 x = (x & 0xffffffff) + (x >> 32);
44
45 /* add up 16-bit for 17 bits */
46 x = (x & 0xffff) + (x >> 16);
47 /* add up carry.. */
48 x = (x & 0xffff) + (x >> 16);
49 return x;
50}
51
52#define odd(x) ((x)&1)
53#define U16(x) ntohs(x)
54
55static unsigned long do_csum(const unsigned char *buff, int len)
56{
57 int odd, count;
58 unsigned long result = 0;
59
60 pr_debug("do_csum buff %p, len %d (0x%x)\n", buff, len, len);
61#ifdef DEBUG
62 for (i = 0; i < len; i++) {
63 if ((i % 26) == 0)
64 printk("\n");
65 printk("%02X ", buff[i]);
66 }
67#endif
68
69 if (len <= 0)
70 goto out;
71
72 odd = 1 & (unsigned long) buff;
73 if (odd) {
74 result = *buff << 8;
75 len--;
76 buff++;
77 }
78 count = len >> 1; /* nr of 16-bit words.. */
79 if (count) {
80 if (2 & (unsigned long) buff) {
81 result += *(unsigned short *) buff;
82 count--;
83 len -= 2;
84 buff += 2;
85 }
86 count >>= 1; /* nr of 32-bit words.. */
87 if (count) {
88 unsigned long carry = 0;
89 do {
90 unsigned long w = *(unsigned long *) buff;
91 buff += 4;
92 count--;
93 result += carry;
94 result += w;
95 carry = (w > result);
96 } while (count);
97 result += carry;
98 result = (result & 0xffff) + (result >> 16);
99 }
100 if (len & 2) {
101 result += *(unsigned short *) buff;
102 buff += 2;
103 }
104 }
105 if (len & 1)
106 result += *buff;
107 result = foldto16(result);
108 if (odd)
109 result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
110
111 pr_debug("\nCHECKSUM is 0x%lx\n", result);
112
113 out:
114 return result;
115}
116
117/* computes the checksum of a memory block at buff, length len,
118 and adds in "sum" (32-bit) */
119__wsum csum_partial(const void *buff, int len, __wsum sum)
120{
121 unsigned long long result = do_csum(buff, len);
122
123 /* add in old sum, and carry.. */
124 result += (__force u32)sum;
125 /* 32+c bits -> 32 bits */
126 result = (result & 0xffffffff) + (result >> 32);
127
128 pr_debug("csum_partial, buff %p len %d sum 0x%x result=0x%016Lx\n",
129 buff, len, sum, result);
130
131 return (__force __wsum)result;
132}
133
134/* Copy while checksumming, otherwise like csum_partial. */
135__wsum
136csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum)
137{
138 sum = csum_partial(src, len, sum);
139 memcpy(dst, src, len);
140
141 return sum;
142}
143
144/* Copy from userspace and compute checksum. If we catch an exception
145 then zero the rest of the buffer. */
146__wsum
147csum_partial_copy_from_user(const void __user *src, void *dst, int len,
148 __wsum sum, int *err_ptr)
149{
150 int missing;
151
152 pr_debug
153 ("csum_partial_copy_from_user src %p, dest %p, len %d, sum %08x, err_ptr %p\n",
154 src, dst, len, sum, err_ptr);
155 missing = copy_from_user(dst, src, len);
156 pr_debug(" access_ok %d\n", __access_ok((unsigned long) src, len));
157 pr_debug(" missing %d\n", missing);
158 if (missing) {
159 memset(dst + len - missing, 0, missing);
160 *err_ptr = -EFAULT;
161 }
162
163 return csum_partial(dst, len, sum);
164}
165
166/* Copy to userspace and compute checksum. */
167__wsum
168csum_partial_copy_to_user(const unsigned char *src, unsigned char *dst, int len,
169 __wsum sum, int *err_ptr)
170{
171 sum = csum_partial(src, len, sum);
172
173 if (copy_to_user(dst, src, len))
174 *err_ptr = -EFAULT;
175
176 return sum;
177}
178
179/*
180 * This is a version of ip_compute_csum() optimized for IP headers,
181 * which always checksum on 4 octet boundaries.
182 */
183__sum16 ip_fast_csum(const void *iph, unsigned int ihl)
184{
185 pr_debug("ip_fast_csum %p,%d\n", iph, ihl);
186
187 return (__force __sum16)~do_csum(iph, ihl * 4);
188}
189
190__wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
191 unsigned short len,
192 unsigned short proto, __wsum sum)
193{
194 unsigned long long result;
195
196 pr_debug("ntohs(0x%x)=0x%x\n", 0xdead, ntohs(0xdead));
197 pr_debug("htons(0x%x)=0x%x\n", 0xdead, htons(0xdead));
198
199 result = (__force u64) saddr + (__force u64) daddr +
200 (__force u64) sum + ((len + proto) << 8);
201
202 /* Fold down to 32-bits so we don't lose in the typedef-less
203 network stack. */
204 /* 64 to 33 */
205 result = (result & 0xffffffff) + (result >> 32);
206 /* 33 to 32 */
207 result = (result & 0xffffffff) + (result >> 32);
208
209 pr_debug("%s saddr %x daddr %x len %x proto %x sum %x result %08Lx\n",
210 __func__, saddr, daddr, len, proto, sum, result);
211
212 return (__wsum)result;
213}
214EXPORT_SYMBOL(csum_tcpudp_nofold);
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