1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
|
/*
* csum_partial_copy - do IP checksumming and copy
*
* (C) Copyright 1996 Linus Torvalds
* accelerated versions (and 21264 assembly versions ) contributed by
* Rick Gorton <rick.gorton@alpha-processor.com>
*
* Don't look at this too closely - you'll go mad. The things
* we do for performance..
*/
#include <linux/types.h>
#include <linux/string.h>
#include <asm/uaccess.h>
#define ldq_u(x,y) \
__asm__ __volatile__("ldq_u %0,%1":"=r" (x):"m" (*(const unsigned long *)(y)))
#define stq_u(x,y) \
__asm__ __volatile__("stq_u %1,%0":"=m" (*(unsigned long *)(y)):"r" (x))
#define extql(x,y,z) \
__asm__ __volatile__("extql %1,%2,%0":"=r" (z):"r" (x),"r" (y))
#define extqh(x,y,z) \
__asm__ __volatile__("extqh %1,%2,%0":"=r" (z):"r" (x),"r" (y))
#define mskql(x,y,z) \
__asm__ __volatile__("mskql %1,%2,%0":"=r" (z):"r" (x),"r" (y))
#define mskqh(x,y,z) \
__asm__ __volatile__("mskqh %1,%2,%0":"=r" (z):"r" (x),"r" (y))
#define insql(x,y,z) \
__asm__ __volatile__("insql %1,%2,%0":"=r" (z):"r" (x),"r" (y))
#define insqh(x,y,z) \
__asm__ __volatile__("insqh %1,%2,%0":"=r" (z):"r" (x),"r" (y))
#define __get_user_u(x,ptr) \
({ \
long __guu_err; \
__asm__ __volatile__( \
"1: ldq_u %0,%2\n" \
"2:\n" \
".section __ex_table,\"a\"\n" \
" .long 1b - .\n" \
" lda %0,2b-1b(%1)\n" \
".previous" \
: "=r"(x), "=r"(__guu_err) \
: "m"(__m(ptr)), "1"(0)); \
__guu_err; \
})
#define __put_user_u(x,ptr) \
({ \
long __puu_err; \
__asm__ __volatile__( \
"1: stq_u %2,%1\n" \
"2:\n" \
".section __ex_table,\"a\"\n" \
" .long 1b - ." \
" lda $31,2b-1b(%0)\n" \
".previous" \
: "=r"(__puu_err) \
: "m"(__m(addr)), "rJ"(x), "0"(0)); \
__puu_err; \
})
static inline unsigned short from64to16(unsigned long x)
{
/* Using extract instructions is a bit more efficient
than the original shift/bitmask version. */
union {
unsigned long ul;
unsigned int ui[2];
unsigned short us[4];
} in_v, tmp_v, out_v;
in_v.ul = x;
tmp_v.ul = (unsigned long) in_v.ui[0] + (unsigned long) in_v.ui[1];
/* Since the bits of tmp_v.sh[3] are going to always be zero,
we don't have to bother to add that in. */
out_v.ul = (unsigned long) tmp_v.us[0] + (unsigned long) tmp_v.us[1]
+ (unsigned long) tmp_v.us[2];
/* Similarly, out_v.us[2] is always zero for the final add. */
return out_v.us[0] + out_v.us[1];
}
/*
* Ok. This isn't fun, but this is the EASY case.
*/
static inline unsigned long
csum_partial_cfu_aligned(const unsigned long __user *src, unsigned long *dst,
long len, unsigned long checksum,
int *errp)
{
unsigned long carry = 0;
int err = 0;
while (len >= 0) {
unsigned long word;
err |= __get_user(word, src);
checksum += carry;
src++;
checksum += word;
len -= 8;
carry = checksum < word;
*dst = word;
dst++;
}
len += 8;
checksum += carry;
if (len) {
unsigned long word, tmp;
err |= __get_user(word, src);
tmp = *dst;
mskql(word, len, word);
checksum += word;
mskqh(tmp, len, tmp);
carry = checksum < word;
*dst = word | tmp;
checksum += carry;
}
if (err) *errp = err;
return checksum;
}
/*
* This is even less fun, but this is still reasonably
* easy.
*/
static inline unsigned long
csum_partial_cfu_dest_aligned(const unsigned long __user *src,
unsigned long *dst,
unsigned long soff,
long len, unsigned long checksum,
int *errp)
{
unsigned long first;
unsigned long word, carry;
unsigned long lastsrc = 7+len+(unsigned long)src;
int err = 0;
err |= __get_user_u(first,src);
carry = 0;
while (len >= 0) {
unsigned long second;
err |= __get_user_u(second, src+1);
extql(first, soff, word);
len -= 8;
src++;
extqh(second, soff, first);
checksum += carry;
word |= first;
first = second;
checksum += word;
*dst = word;
dst++;
carry = checksum < word;
}
len += 8;
checksum += carry;
if (len) {
unsigned long tmp;
unsigned long second;
err |= __get_user_u(second, lastsrc);
tmp = *dst;
extql(first, soff, word);
extqh(second, soff, first);
word |= first;
mskql(word, len, word);
checksum += word;
mskqh(tmp, len, tmp);
carry = checksum < word;
*dst = word | tmp;
checksum += carry;
}
if (err) *errp = err;
return checksum;
}
/*
* This is slightly less fun than the above..
*/
static inline unsigned long
csum_partial_cfu_src_aligned(const unsigned long __user *src,
unsigned long *dst,
unsigned long doff,
long len, unsigned long checksum,
unsigned long partial_dest,
int *errp)
{
unsigned long carry = 0;
unsigned long word;
unsigned long second_dest;
int err = 0;
mskql(partial_dest, doff, partial_dest);
while (len >= 0) {
err |= __get_user(word, src);
len -= 8;
insql(word, doff, second_dest);
checksum += carry;
stq_u(partial_dest | second_dest, dst);
src++;
checksum += word;
insqh(word, doff, partial_dest);
carry = checksum < word;
dst++;
}
len += 8;
if (len) {
checksum += carry;
err |= __get_user(word, src);
mskql(word, len, word);
len -= 8;
checksum += word;
insql(word, doff, second_dest);
len += doff;
carry = checksum < word;
partial_dest |= second_dest;
if (len >= 0) {
stq_u(partial_dest, dst);
if (!len) goto out;
dst++;
insqh(word, doff, partial_dest);
}
doff = len;
}
ldq_u(second_dest, dst);
mskqh(second_dest, doff, second_dest);
stq_u(partial_dest | second_dest, dst);
out:
checksum += carry;
if (err) *errp = err;
return checksum;
}
/*
* This is so totally un-fun that it's frightening. Don't
* look at this too closely, you'll go blind.
*/
static inline unsigned long
csum_partial_cfu_unaligned(const unsigned long __user * src,
unsigned long * dst,
unsigned long soff, unsigned long doff,
long len, unsigned long checksum,
unsigned long partial_dest,
int *errp)
{
unsigned long carry = 0;
unsigned long first;
unsigned long lastsrc;
int err = 0;
err |= __get_user_u(first, src);
lastsrc = 7+len+(unsigned long)src;
mskql(partial_dest, doff, partial_dest);
while (len >= 0) {
unsigned long second, word;
unsigned long second_dest;
err |= __get_user_u(second, src+1);
extql(first, soff, word);
checksum += carry;
len -= 8;
extqh(second, soff, first);
src++;
word |= first;
first = second;
insql(word, doff, second_dest);
checksum += word;
stq_u(partial_dest | second_dest, dst);
carry = checksum < word;
insqh(word, doff, partial_dest);
dst++;
}
len += doff;
checksum += carry;
if (len >= 0) {
unsigned long second, word;
unsigned long second_dest;
err |= __get_user_u(second, lastsrc);
extql(first, soff, word);
extqh(second, soff, first);
word |= first;
first = second;
mskql(word, len-doff, word);
checksum += word;
insql(word, doff, second_dest);
carry = checksum < word;
stq_u(partial_dest | second_dest, dst);
if (len) {
ldq_u(second_dest, dst+1);
insqh(word, doff, partial_dest);
mskqh(second_dest, len, second_dest);
stq_u(partial_dest | second_dest, dst+1);
}
checksum += carry;
} else {
unsigned long second, word;
unsigned long second_dest;
err |= __get_user_u(second, lastsrc);
extql(first, soff, word);
extqh(second, soff, first);
word |= first;
ldq_u(second_dest, dst);
mskql(word, len-doff, word);
checksum += word;
mskqh(second_dest, len, second_dest);
carry = checksum < word;
insql(word, doff, word);
stq_u(partial_dest | word | second_dest, dst);
checksum += carry;
}
if (err) *errp = err;
return checksum;
}
__wsum
csum_partial_copy_from_user(const void __user *src, void *dst, int len,
__wsum sum, int *errp)
{
unsigned long checksum = (__force u32) sum;
unsigned long soff = 7 & (unsigned long) src;
unsigned long doff = 7 & (unsigned long) dst;
if (len) {
if (!access_ok(VERIFY_READ, src, len)) {
*errp = -EFAULT;
memset(dst, 0, len);
return sum;
}
if (!doff) {
if (!soff)
checksum = csum_partial_cfu_aligned(
(const unsigned long __user *) src,
(unsigned long *) dst,
len-8, checksum, errp);
else
checksum = csum_partial_cfu_dest_aligned(
(const unsigned long __user *) src,
(unsigned long *) dst,
soff, len-8, checksum, errp);
} else {
unsigned long partial_dest;
ldq_u(partial_dest, dst);
if (!soff)
checksum = csum_partial_cfu_src_aligned(
(const unsigned long __user *) src,
(unsigned long *) dst,
doff, len-8, checksum,
partial_dest, errp);
else
checksum = csum_partial_cfu_unaligned(
(const unsigned long __user *) src,
(unsigned long *) dst,
soff, doff, len-8, checksum,
partial_dest, errp);
}
checksum = from64to16 (checksum);
}
return (__force __wsum)checksum;
}
__wsum
csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum)
{
return csum_partial_copy_from_user((__force const void __user *)src,
dst, len, sum, NULL);
}
|
