aboutsummaryrefslogtreecommitdiffstats
path: root/arch/sparc64/lib/csum_copy.S
blob: e566c770a0f6372de5e4e7856ff520a9ac8920ac (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
/* csum_copy.S: Checksum+copy code for sparc64
 *
 * Copyright (C) 2005 David S. Miller <davem@davemloft.net>
 */

#ifdef __KERNEL__
#define GLOBAL_SPARE	%g7
#else
#define GLOBAL_SPARE	%g5
#endif

#ifndef EX_LD
#define EX_LD(x)	x
#endif

#ifndef EX_ST
#define EX_ST(x)	x
#endif

#ifndef EX_RETVAL
#define EX_RETVAL(x)	x
#endif

#ifndef LOAD
#define LOAD(type,addr,dest)	type [addr], dest
#endif

#ifndef STORE
#define STORE(type,src,addr)	type src, [addr]
#endif

#ifndef FUNC_NAME
#define FUNC_NAME	csum_partial_copy_nocheck
#endif

	.register	%g2, #scratch
	.register	%g3, #scratch

	.text

90:
	/* We checked for zero length already, so there must be
	 * at least one byte.
	 */
	be,pt		%icc, 1f
	 nop
	EX_LD(LOAD(ldub, %o0 + 0x00, %o4))
	add		%o0, 1, %o0
	sub		%o2, 1, %o2
	EX_ST(STORE(stb, %o4, %o1 + 0x00))
	add		%o1, 1, %o1
1:	andcc		%o0, 0x2, %g0
	be,pn		%icc, 80f
	 cmp		%o2, 2
	blu,pn		%icc, 60f
	 nop
	EX_LD(LOAD(lduh, %o0 + 0x00, %o5))
	add		%o0, 2, %o0
	sub		%o2, 2, %o2
	EX_ST(STORE(sth, %o5, %o1 + 0x00))
	add		%o1, 2, %o1
	ba,pt		%xcc, 80f
	 add		%o5, %o4, %o4

	.globl		FUNC_NAME
FUNC_NAME:		/* %o0=src, %o1=dst, %o2=len, %o3=sum */
	LOAD(prefetch, %o0 + 0x000, #n_reads)
	xor		%o0, %o1, %g1
	clr		%o4
	andcc		%g1, 0x3, %g0
	bne,pn		%icc, 95f
	 LOAD(prefetch, %o0 + 0x040, #n_reads)
	
	brz,pn		%o2, 70f
	 andcc		%o0, 0x3, %g0

	/* We "remember" whether the lowest bit in the address
	 * was set in GLOBAL_SPARE.  Because if it is, we have to swap
	 * upper and lower 8 bit fields of the sum we calculate.
	*/
	bne,pn		%icc, 90b
	 andcc		%o0, 0x1, GLOBAL_SPARE

80:
	LOAD(prefetch, %o0 + 0x080, #n_reads)
	andncc		%o2, 0x3f, %g3

	LOAD(prefetch, %o0 + 0x0c0, #n_reads)
	sub		%o2, %g3, %o2
	brz,pn		%g3, 2f
	 LOAD(prefetch, %o0 + 0x100, #n_reads)

	/* So that we don't need to use the non-pairing
	 * add-with-carry instructions we accumulate 32-bit
	 * values into a 64-bit register.  At the end of the
	 * loop we fold it down to 32-bits and so on.
	 */
	ba,pt		%xcc, 1f
	LOAD(prefetch, %o0 + 0x140, #n_reads)

	.align		32
1:	EX_LD(LOAD(lduw, %o0 + 0x00, %o5))
	EX_LD(LOAD(lduw, %o0 + 0x04, %g1))
	EX_LD(LOAD(lduw, %o0 + 0x08, %g2))
	add		%o4, %o5, %o4
	EX_ST(STORE(stw, %o5, %o1 + 0x00))
	EX_LD(LOAD(lduw, %o0 + 0x0c, %o5))
	add		%o4, %g1, %o4
	EX_ST(STORE(stw, %g1, %o1 + 0x04))
	EX_LD(LOAD(lduw, %o0 + 0x10, %g1))
	add		%o4, %g2, %o4
	EX_ST(STORE(stw, %g2, %o1 + 0x08))
	EX_LD(LOAD(lduw, %o0 + 0x14, %g2))
	add		%o4, %o5, %o4
	EX_ST(STORE(stw, %o5, %o1 + 0x0c))
	EX_LD(LOAD(lduw, %o0 + 0x18, %o5))
	add		%o4, %g1, %o4
	EX_ST(STORE(stw, %g1, %o1 + 0x10))
	EX_LD(LOAD(lduw, %o0 + 0x1c, %g1))
	add		%o4, %g2, %o4
	EX_ST(STORE(stw, %g2, %o1 + 0x14))
	EX_LD(LOAD(lduw, %o0 + 0x20, %g2))
	add		%o4, %o5, %o4
	EX_ST(STORE(stw, %o5, %o1 + 0x18))
	EX_LD(LOAD(lduw, %o0 + 0x24, %o5))
	add		%o4, %g1, %o4
	EX_ST(STORE(stw, %g1, %o1 + 0x1c))
	EX_LD(LOAD(lduw, %o0 + 0x28, %g1))
	add		%o4, %g2, %o4
	EX_ST(STORE(stw, %g2, %o1 + 0x20))
	EX_LD(LOAD(lduw, %o0 + 0x2c, %g2))
	add		%o4, %o5, %o4
	EX_ST(STORE(stw, %o5, %o1 + 0x24))
	EX_LD(LOAD(lduw, %o0 + 0x30, %o5))
	add		%o4, %g1, %o4
	EX_ST(STORE(stw, %g1, %o1 + 0x28))
	EX_LD(LOAD(lduw, %o0 + 0x34, %g1))
	add		%o4, %g2, %o4
	EX_ST(STORE(stw, %g2, %o1 + 0x2c))
	EX_LD(LOAD(lduw, %o0 + 0x38, %g2))
	add		%o4, %o5, %o4
	EX_ST(STORE(stw, %o5, %o1 + 0x30))
	EX_LD(LOAD(lduw, %o0 + 0x3c, %o5))
	add		%o4, %g1, %o4
	EX_ST(STORE(stw, %g1, %o1 + 0x34))
	LOAD(prefetch, %o0 + 0x180, #n_reads)
	add		%o4, %g2, %o4
	EX_ST(STORE(stw, %g2, %o1 + 0x38))
	subcc		%g3, 0x40, %g3
	add		%o0, 0x40, %o0
	add		%o4, %o5, %o4
	EX_ST(STORE(stw, %o5, %o1 + 0x3c))
	bne,pt		%icc, 1b
	 add		%o1, 0x40, %o1

2:	and		%o2, 0x3c, %g3
	brz,pn		%g3, 2f
	 sub		%o2, %g3, %o2
1:	EX_LD(LOAD(lduw, %o0 + 0x00, %o5))
	subcc		%g3, 0x4, %g3
	add		%o0, 0x4, %o0
	add		%o4, %o5, %o4
	EX_ST(STORE(stw, %o5, %o1 + 0x00))
	bne,pt		%icc, 1b
	 add		%o1, 0x4, %o1

2:
	/* fold 64-->32 */
	srlx		%o4, 32, %o5
	srl		%o4, 0, %o4
	add		%o4, %o5, %o4
	srlx		%o4, 32, %o5
	srl		%o4, 0, %o4
	add		%o4, %o5, %o4

	/* fold 32-->16 */
	sethi		%hi(0xffff0000), %g1
	srl		%o4, 16, %o5
	andn		%o4, %g1, %g2
	add		%o5, %g2, %o4
	srl		%o4, 16, %o5
	andn		%o4, %g1, %g2
	add		%o5, %g2, %o4

60:
	/* %o4 has the 16-bit sum we have calculated so-far.  */
	cmp		%o2, 2
	blu,pt		%icc, 1f
	 nop
	EX_LD(LOAD(lduh, %o0 + 0x00, %o5))
	sub		%o2, 2, %o2
	add		%o0, 2, %o0
	add		%o4, %o5, %o4
	EX_ST(STORE(sth, %o5, %o1 + 0x00))
	add		%o1, 0x2, %o1
1:	brz,pt		%o2, 1f
	 nop
	EX_LD(LOAD(ldub, %o0 + 0x00, %o5))
	sub		%o2, 1, %o2
	add		%o0, 1, %o0
	EX_ST(STORE(stb, %o5, %o1 + 0x00))
	sllx		%o5, 8, %o5
	add		%o1, 1, %o1
	add		%o4, %o5, %o4
1:
	/* fold 32-->16 */
	sethi		%hi(0xffff0000), %g1
	srl		%o4, 16, %o5
	andn		%o4, %g1, %g2
	add		%o5, %g2, %o4
	srl		%o4, 16, %o5
	andn		%o4, %g1, %g2
	add		%o5, %g2, %o4

1:	brz,pt		GLOBAL_SPARE, 1f
	 nop

	/* We started with an odd byte, byte-swap the result.  */
	srl		%o4, 8, %o5
	and		%o4, 0xff, %g1
	sll		%g1, 8, %g1
	or		%o5, %g1, %o4

1:	addcc		%o3, %o4, %o3
	addc		%g0, %o3, %o3

70:
	retl
	 srl		%o3, 0, %o0

95:	mov		0, GLOBAL_SPARE
	brlez,pn	%o2, 4f
	 andcc		%o0, 1, %o5		
	be,a,pt		%icc, 1f
	 srl		%o2, 1, %g1		
	sub		%o2, 1, %o2	
	EX_LD(LOAD(ldub, %o0, GLOBAL_SPARE))
	add		%o0, 1, %o0	
	EX_ST(STORE(stb, GLOBAL_SPARE, %o1))
	srl		%o2, 1, %g1
	add		%o1, 1, %o1
1:	brz,a,pn	%g1, 3f
	 andcc		%o2, 1, %g0
	andcc		%o0, 2, %g0	
	be,a,pt		%icc, 1f
	 srl		%g1, 1, %g1
	EX_LD(LOAD(lduh, %o0, %o4))
	sub		%o2, 2, %o2	
	srl		%o4, 8, %g2
	sub		%g1, 1, %g1	
	EX_ST(STORE(stb, %g2, %o1))
	add		%o4, GLOBAL_SPARE, GLOBAL_SPARE
	EX_ST(STORE(stb, %o4, %o1 + 1))
	add		%o0, 2, %o0	
	srl		%g1, 1, %g1
	add		%o1, 2, %o1
1:	brz,a,pn	%g1, 2f		
	 andcc		%o2, 2, %g0
	EX_LD(LOAD(lduw, %o0, %o4))
5:	srl		%o4, 24, %g2
	srl		%o4, 16, %g3
	EX_ST(STORE(stb, %g2, %o1))
	srl		%o4, 8, %g2
	EX_ST(STORE(stb, %g3, %o1 + 1))
	add		%o0, 4, %o0
	EX_ST(STORE(stb, %g2, %o1 + 2))
	addcc		%o4, GLOBAL_SPARE, GLOBAL_SPARE
	EX_ST(STORE(stb, %o4, %o1 + 3))
	addc		GLOBAL_SPARE, %g0, GLOBAL_SPARE
	add		%o1, 4, %o1
	subcc		%g1, 1, %g1
	bne,a,pt	%icc, 5b
	 EX_LD(LOAD(lduw, %o0, %o4))
	sll		GLOBAL_SPARE, 16, %g2
	srl		GLOBAL_SPARE, 16, GLOBAL_SPARE
	srl		%g2, 16, %g2
	andcc		%o2, 2, %g0
	add		%g2, GLOBAL_SPARE, GLOBAL_SPARE 
2:	be,a,pt		%icc, 3f		
	 andcc		%o2, 1, %g0
	EX_LD(LOAD(lduh, %o0, %o4))
	andcc		%o2, 1, %g0
	srl		%o4, 8, %g2
	add		%o0, 2, %o0	
	EX_ST(STORE(stb, %g2, %o1))
	add		GLOBAL_SPARE, %o4, GLOBAL_SPARE
	EX_ST(STORE(stb, %o4, %o1 + 1))
	add		%o1, 2, %o1
3:	be,a,pt		%icc, 1f		
	 sll		GLOBAL_SPARE, 16, %o4
	EX_LD(LOAD(ldub, %o0, %g2))
	sll		%g2, 8, %o4	
	EX_ST(STORE(stb, %g2, %o1))
	add		GLOBAL_SPARE, %o4, GLOBAL_SPARE
	sll		GLOBAL_SPARE, 16, %o4
1:	addcc		%o4, GLOBAL_SPARE, GLOBAL_SPARE
	srl		GLOBAL_SPARE, 16, %o4
	addc		%g0, %o4, GLOBAL_SPARE
	brz,pt		%o5, 4f
	 srl		GLOBAL_SPARE, 8, %o4
	and		GLOBAL_SPARE, 0xff, %g2
	and		%o4, 0xff, %o4
	sll		%g2, 8, %g2
	or		%g2, %o4, GLOBAL_SPARE
4:	addcc		%o3, GLOBAL_SPARE, %o3
	addc		%g0, %o3, %o0
	retl
	 srl		%o0, 0, %o0
	.size		FUNC_NAME, .-FUNC_NAME