summaryrefslogtreecommitdiffstats
path: root/arch/c6x/lib/csum_64plus.S
blob: 6d25896472273bb97281bdb04fa8b3e02b87f6b2 (plain)
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
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
;
;  linux/arch/c6x/lib/csum_64plus.s
;
;  Port on Texas Instruments TMS320C6x architecture
;
;  Copyright (C) 2006, 2009, 2010, 2011 Texas Instruments Incorporated
;  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
;
;  This program is free software; you can redistribute it and/or modify
;  it under the terms of the GNU General Public License version 2 as
;  published by the Free Software Foundation.
;
#include <linux/linkage.h>

;
;unsigned int csum_partial_copy(const char *src, char * dst,
;				int len, int sum)
;
; A4:	src
; B4:	dst
; A6:	len
; B6:	sum
; return csum in A4
;

	.text
ENTRY(csum_partial_copy)
	MVC	.S2	ILC,B30

	MV	.D1X	B6,A31		; given csum
	ZERO	.D1	A9		; csum (a side)
||	ZERO	.D2	B9		; csum (b side)
||	SHRU	.S2X	A6,2,B5		; len / 4

	;; Check alignment and size
	AND	.S1	3,A4,A1
||	AND	.S2	3,B4,B0
	OR	.L2X	B0,A1,B0	; non aligned condition
||	MVC	.S2	B5,ILC
||	MVK	.D2	1,B2
||	MV	.D1X	B5,A1		; words condition
  [!A1]	B	.S1	L8
   [B0] BNOP	.S1	L6,5

	SPLOOP		1

	;; Main loop for aligned words
	LDW	.D1T1	*A4++,A7
	NOP	4
	MV	.S2X	A7,B7
||	EXTU	.S1	A7,0,16,A16
	STW	.D2T2	B7,*B4++
||	MPYU	.M2	B7,B2,B8
||	ADD	.L1	A16,A9,A9
	NOP
	SPKERNEL	8,0
||	ADD	.L2	B8,B9,B9

	ZERO	.D1	A1
||	ADD	.L1X	A9,B9,A9	;  add csum from a and b sides

L6:
  [!A1]	BNOP	.S1	L8,5

	;; Main loop for non-aligned words
	SPLOOP		2
 ||	MVK	.L1	1,A2

	LDNW	.D1T1	*A4++,A7
	NOP		3

	NOP
	MV	.S2X	A7,B7
 ||	EXTU	.S1	A7,0,16,A16
 ||	MPYU	.M1	A7,A2,A8

	ADD	.L1	A16,A9,A9
	SPKERNEL	6,0
 ||	STNW	.D2T2	B7,*B4++
 ||	ADD	.L1	A8,A9,A9

L8:	AND	.S2X	2,A6,B5
	CMPGT	.L2	B5,0,B0
  [!B0]	BNOP	.S1	L82,4

	;; Manage half-word
	ZERO	.L1	A7
||	ZERO	.D1	A8

#ifdef CONFIG_CPU_BIG_ENDIAN

	LDBU	.D1T1	*A4++,A7
	LDBU	.D1T1	*A4++,A8
	NOP		3
	SHL	.S1	A7,8,A0
	ADD	.S1	A8,A9,A9
	STB	.D2T1	A7,*B4++
||	ADD	.S1	A0,A9,A9
	STB	.D2T1	A8,*B4++

#else

	LDBU	.D1T1	*A4++,A7
	LDBU	.D1T1	*A4++,A8
	NOP		3
	ADD	.S1	A7,A9,A9
	SHL	.S1	A8,8,A0

	STB	.D2T1	A7,*B4++
||	ADD	.S1	A0,A9,A9
	STB	.D2T1	A8,*B4++

#endif

	;; Manage eventually the last byte
L82:	AND	.S2X	1,A6,B0
  [!B0]	BNOP	.S1	L9,5

||	ZERO	.L1	A7

L83:	LDBU	.D1T1	*A4++,A7
	NOP		4

	MV	.L2X	A7,B7

#ifdef CONFIG_CPU_BIG_ENDIAN

	STB	.D2T2	B7,*B4++
||	SHL	.S1	A7,8,A7
	ADD	.S1	A7,A9,A9

#else

	STB	.D2T2	B7,*B4++
||	ADD	.S1	A7,A9,A9

#endif

	;; Fold the csum
L9:	SHRU	.S2X	A9,16,B0
  [!B0]	BNOP	.S1	L10,5

L91:	SHRU	.S2X	A9,16,B4
||	EXTU	.S1	A9,16,16,A3
	ADD	.D1X	A3,B4,A9

	SHRU	.S1	A9,16,A0
   [A0]	BNOP	.S1	L91,5

L10:	ADD	.D1	A31,A9,A9
	MV	.D1	A9,A4

	BNOP	.S2	B3,4
	MVC	.S2	B30,ILC
ENDPROC(csum_partial_copy)

;
;unsigned short
;ip_fast_csum(unsigned char *iph, unsigned int ihl)
;{
;	unsigned int checksum = 0;
;	unsigned short *tosum = (unsigned short *) iph;
;	int len;
;
;	len = ihl*4;
;
;	if (len <= 0)
;		return 0;
;
;	while(len) {
;		len -= 2;
;		checksum += *tosum++;
;	}
;	if (len & 1)
;		checksum += *(unsigned char*) tosum;
;
;	while(checksum >> 16)
;		checksum = (checksum & 0xffff) + (checksum >> 16);
;
;	return ~checksum;
;}
;
; A4:	iph
; B4:	ihl
; return checksum in A4
;
	.text

ENTRY(ip_fast_csum)
	ZERO	.D1	A5
 ||	MVC	.S2	ILC,B30
	SHL	.S2	B4,2,B0
	CMPGT	.L2	B0,0,B1
  [!B1] BNOP	.S1	L15,4
  [!B1]	ZERO	.D1	A3

  [!B0]	B	.S1	L12
	SHRU	.S2	B0,1,B0
	MVC	.S2	B0,ILC
	NOP	3

	SPLOOP	1
	LDHU	.D1T1	*A4++,A3
	NOP	3
	NOP
	SPKERNEL	5,0
 ||	ADD	.L1	A3,A5,A5

L12:	SHRU	.S1	A5,16,A0
  [!A0]	BNOP	.S1	L14,5

L13:	SHRU	.S2X	A5,16,B4
	EXTU	.S1	A5,16,16,A3
	ADD	.D1X	A3,B4,A5
	SHRU	.S1	A5,16,A0
  [A0]	BNOP	.S1	L13,5

L14:	NOT	.D1	A5,A3
	EXTU	.S1	A3,16,16,A3

L15:	BNOP	.S2	B3,3
	MVC	.S2	B30,ILC
	MV	.D1	A3,A4
ENDPROC(ip_fast_csum)

;
;unsigned short
;do_csum(unsigned char *buff, unsigned int len)
;{
;	int odd, count;
;	unsigned int result = 0;
;
;	if (len <= 0)
;		goto out;
;	odd = 1 & (unsigned long) buff;
;	if (odd) {
;#ifdef __LITTLE_ENDIAN
;		result += (*buff << 8);
;#else
;		result = *buff;
;#endif
;		len--;
;		buff++;
;	}
;	count = len >> 1;		/* nr of 16-bit words.. */
;	if (count) {
;		if (2 & (unsigned long) buff) {
;			result += *(unsigned short *) buff;
;			count--;
;			len -= 2;
;			buff += 2;
;		}
;		count >>= 1;		/* nr of 32-bit words.. */
;		if (count) {
;			unsigned int carry = 0;
;			do {
;				unsigned int w = *(unsigned int *) buff;
;				count--;
;				buff += 4;
;				result += carry;
;				result += w;
;				carry = (w > result);
;			} while (count);
;			result += carry;
;			result = (result & 0xffff) + (result >> 16);
;		}
;		if (len & 2) {
;			result += *(unsigned short *) buff;
;			buff += 2;
;		}
;	}
;	if (len & 1)
;#ifdef __LITTLE_ENDIAN
;		result += *buff;
;#else
;		result += (*buff << 8);
;#endif
;	result = (result & 0xffff) + (result >> 16);
;	/* add up carry.. */
;	result = (result & 0xffff) + (result >> 16);
;	if (odd)
;		result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
;out:
;	return result;
;}
;
; A4:	buff
; B4:	len
; return checksum in A4
;

ENTRY(do_csum)
	   CMPGT   .L2	   B4,0,B0
   [!B0]   BNOP    .S1	   L26,3
	   EXTU    .S1	   A4,31,31,A0

	   MV	   .L1	   A0,A3
||	   MV	   .S1X    B3,A5
||	   MV	   .L2	   B4,B3
||	   ZERO    .D1	   A1

#ifdef CONFIG_CPU_BIG_ENDIAN
   [A0]    SUB	   .L2	   B3,1,B3
|| [A0]    LDBU    .D1T1   *A4++,A1
#else
   [!A0]   BNOP    .S1	   L21,5
|| [A0]    LDBU    .D1T1   *A4++,A0
	   SUB	   .L2	   B3,1,B3
||	   SHL	   .S1	   A0,8,A1
L21:
#endif
	   SHR	   .S2	   B3,1,B0
   [!B0]   BNOP    .S1	   L24,3
	   MVK	   .L1	   2,A0
	   AND	   .L1	   A4,A0,A0

   [!A0]   BNOP    .S1	   L22,5
|| [A0]    LDHU    .D1T1   *A4++,A0
	   SUB	   .L2	   B0,1,B0
||	   SUB	   .S2	   B3,2,B3
||	   ADD	   .L1	   A0,A1,A1
L22:
	   SHR	   .S2	   B0,1,B0
||	   ZERO    .L1	   A0

   [!B0]   BNOP    .S1	   L23,5
|| [B0]    MVC	   .S2	   B0,ILC

	   SPLOOP  3
	   SPMASK  L1
||	   MV	   .L1	   A1,A2
||	   LDW	   .D1T1   *A4++,A1

	   NOP	   4
	   ADD	   .L1	   A0,A1,A0
	   ADD	   .L1	   A2,A0,A2

	   SPKERNEL 1,2
||	   CMPGTU  .L1	   A1,A2,A0

	   ADD	   .L1	   A0,A2,A6
	   EXTU    .S1	   A6,16,16,A7
	   SHRU    .S2X    A6,16,B0
	   NOP		   1
	   ADD	   .L1X    A7,B0,A1
L23:
	   MVK	   .L2	   2,B0
	   AND	   .L2	   B3,B0,B0
   [B0]    LDHU    .D1T1   *A4++,A0
	   NOP	   4
   [B0]    ADD	   .L1	   A0,A1,A1
L24:
	   EXTU    .S2	   B3,31,31,B0
#ifdef CONFIG_CPU_BIG_ENDIAN
   [!B0]   BNOP    .S1	   L25,4
|| [B0]    LDBU    .D1T1   *A4,A0
	   SHL	   .S1	   A0,8,A0
	   ADD	   .L1	   A0,A1,A1
L25:
#else
   [B0]    LDBU    .D1T1   *A4,A0
	   NOP	   4
   [B0]    ADD	   .L1	   A0,A1,A1
#endif
	   EXTU    .S1	   A1,16,16,A0
	   SHRU    .S2X    A1,16,B0
	   NOP	   1
	   ADD	   .L1X    A0,B0,A0
	   SHRU    .S1	   A0,16,A1
	   ADD	   .L1	   A0,A1,A0
	   EXTU    .S1	   A0,16,16,A1
	   EXTU    .S1	   A1,16,24,A2

	   EXTU    .S1	   A1,24,16,A0
||	   MV	   .L2X    A3,B0

   [B0]    OR	   .L1	   A0,A2,A1
L26:
	   NOP	   1
	   BNOP    .S2X    A5,4
	   MV	   .L1	   A1,A4
ENDPROC(do_csum)

;__wsum csum_partial(const void *buff, int len, __wsum wsum)
;{
;	unsigned int sum = (__force unsigned int)wsum;
;	unsigned int result = do_csum(buff, len);
;
;	/* add in old sum, and carry.. */
;	result += sum;
;	if (sum > result)
;		result += 1;
;	return (__force __wsum)result;
;}
;
ENTRY(csum_partial)
	   MV	   .L1X    B3,A9
||	   CALLP   .S2	   do_csum,B3
||	   MV	   .S1	   A6,A8
	   BNOP    .S2X    A9,2
	   ADD	   .L1	   A8,A4,A1
	   CMPGTU  .L1	   A8,A1,A0
	   ADD	   .L1	   A1,A0,A4
ENDPROC(csum_partial)

;unsigned short
;ip_compute_csum(unsigned char *buff, unsigned int len)
;
; A4:	buff
; B4:	len
; return checksum in A4

ENTRY(ip_compute_csum)
	   MV	   .L1X    B3,A9
||	   CALLP   .S2	   do_csum,B3
	   BNOP    .S2X    A9,3
	   NOT	   .S1	   A4,A4
	   CLR     .S1	   A4,16,31,A4
ENDPROC(ip_compute_csum)