summaryrefslogtreecommitdiff
path: root/pfinet/linux-src/arch/sparc64/lib/checksum.S
blob: ea732b367fa5df1ee981ec21acd1990a754742a3 (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
/* checksum.S: Sparc V9 optimized checksum code.
 *
 *  Copyright(C) 1995 Linus Torvalds
 *  Copyright(C) 1995 Miguel de Icaza
 *  Copyright(C) 1996 David S. Miller
 *  Copyright(C) 1997 Jakub Jelinek
 *
 * derived from:
 *	Linux/Alpha checksum c-code
 *      Linux/ix86 inline checksum assembly
 *      RFC1071 Computing the Internet Checksum (esp. Jacobsons m68k code)
 *	David Mosberger-Tang for optimized reference c-code
 *	BSD4.4 portable checksum routine
 */

#include <asm/errno.h>
#include <asm/head.h>
#include <asm/ptrace.h>
#include <asm/asi.h>
#include <asm/page.h>

	/* The problem with the "add with carry" instructions on Ultra
	 * are two fold.  Firstly, they cannot pair with jack shit,
	 * and also they only add in the 32-bit carry condition bit
	 * into the accumulated sum.  The following is much better.
	 * For larger chunks we use VIS code, which is faster ;)
	 */

#define src o0
#define dst o1
#define len o2
#define sum o3

	.text
	/* I think I have an erection...  Once _AGAIN_ the SunSoft
	 * engineers are caught asleep at the keyboard, tsk tsk...
	 */

#define CSUMCOPY_LASTCHUNK(off, t0, t1)							\
	ldxa		[%src - off - 0x08] %asi, t0;					\
	ldxa		[%src - off - 0x00] %asi, t1;					\
	nop; nop;									\
	addcc		t0, %sum, %sum;							\
	stw		t0, [%dst - off - 0x04];					\
	srlx		t0, 32, t0;							\
	bcc,pt		%xcc, 51f;							\
	 stw		t0, [%dst - off - 0x08];					\
	add		%sum, 1, %sum;							\
51:	addcc		t1, %sum, %sum;							\
	stw		t1, [%dst - off + 0x04];					\
	srlx		t1, 32, t1;							\
	bcc,pt		%xcc, 52f;							\
	 stw		t1, [%dst - off - 0x00];					\
	add		%sum, 1, %sum;							\
52:

cpc_start:
cc_end_cruft:
	andcc		%g7, 8, %g0		! IEU1	Group
	be,pn		%icc, 1f		! CTI
	 and		%g7, 4, %g5		! IEU0
	ldxa		[%src + 0x00] %asi, %g2	! Load	Group
	add		%dst, 8, %dst		! IEU0
	add		%src, 8, %src		! IEU1
	addcc		%g2, %sum, %sum		! IEU1	Group + 2 bubbles
	stw		%g2, [%dst - 0x04]	! Store
	srlx		%g2, 32, %g2		! IEU0
	bcc,pt		%xcc, 1f		! CTI	Group
	 stw		%g2, [%dst - 0x08]	! Store
	add		%sum, 1, %sum		! IEU0
1:	brz,pt		%g5, 1f			! CTI	Group
	 clr		%g2			! IEU0
	lduwa		[%src + 0x00] %asi, %g2	! Load
	add		%dst, 4, %dst		! IEU0	Group
	add		%src, 4, %src		! IEU1
	stw		%g2, [%dst - 0x04]	! Store	Group + 2 bubbles
	sllx		%g2, 32, %g2		! IEU0
1:	andcc		%g7, 2, %g0		! IEU1
	be,pn		%icc, 1f		! CTI	Group
	 clr		%o4			! IEU1
	lduha		[%src + 0x00] %asi, %o4	! Load
	add		%src, 2, %src		! IEU0	Group
	add		%dst, 2, %dst		! IEU1
	sth		%o4, [%dst - 0x2]	! Store Group + 2 bubbles
	sll		%o4, 16, %o4		! IEU0
1:	andcc		%g7, 1, %g0		! IEU1
	be,pn		%icc, 1f		! CTI	Group
	 clr		%o5			! IEU0
	lduba		[%src + 0x00] %asi, %o5	! Load
	stb		%o5, [%dst + 0x00]	! Store	Group + 2 bubbles
	sll		%o5, 8, %o5		! IEU0
1:	or		%g2, %o4, %o4		! IEU1
	or		%o5, %o4, %o4		! IEU0	Group
	addcc		%o4, %sum, %sum		! IEU1
	bcc,pt		%xcc, ccfold		! CTI
	 sethi		%uhi(PAGE_OFFSET), %g4	! IEU0	Group
	b,pt		%xcc, ccfold		! CTI
	 add		%sum, 1, %sum		! IEU1

cc_fixit:
	cmp		%len, 6			! IEU1	Group
	bl,a,pn		%icc, ccte		! CTI
	 andcc		%len, 0xf, %g7		! IEU1	Group
	andcc		%src, 2, %g0		! IEU1	Group
	be,pn		%icc, 1f		! CTI
	 andcc		%src, 0x4, %g0		! IEU1	Group
	lduha		[%src + 0x00] %asi, %g4	! Load
	sub		%len, 2, %len		! IEU0
	add		%src, 2, %src		! IEU0	Group
	add		%dst, 2, %dst		! IEU1
	sll		%g4, 16, %g3		! IEU0	Group + 1 bubble
	addcc		%g3, %sum, %sum		! IEU1
	bcc,pt		%xcc, 0f		! CTI
	 srl		%sum, 16, %g3		! IEU0	Group
	add		%g3, 1, %g3		! IEU0	4 clocks (mispredict)
0:	andcc		%src, 0x4, %g0		! IEU1	Group
	sth		%g4, [%dst - 0x2]	! Store
	sll		%sum, 16, %sum		! IEU0
	sll		%g3, 16, %g3		! IEU0	Group
	srl		%sum, 16, %sum		! IEU0	Group
	or		%g3, %sum, %sum		! IEU0	Group (regdep)
1:	be,pt		%icc, ccmerge		! CTI
	 andcc		%len, 0xf0, %g1		! IEU1
	lduwa		[%src + 0x00] %asi, %g4	! Load	Group
	sub		%len, 4, %len		! IEU0
	add		%src, 4, %src		! IEU1
	add		%dst, 4, %dst		! IEU0	Group
	addcc		%g4, %sum, %sum		! IEU1	Group + 1 bubble
	stw		%g4, [%dst - 0x4]	! Store
	bcc,pt		%xcc, ccmerge		! CTI
	 andcc		%len, 0xf0, %g1		! IEU1	Group
	b,pt		%xcc, ccmerge		! CTI	4 clocks (mispredict)
	 add		%sum, 1, %sum		! IEU0

	.align		32
	.globl		csum_partial_copy_sparc64
csum_partial_copy_sparc64:			/* %o0=src, %o1=dest, %o2=len, %o3=sum */
	xorcc		%src, %dst, %o4		! IEU1	Group
	srl		%sum, 0, %sum		! IEU0
	andcc		%o4, 3, %g0		! IEU1	Group
	srl		%len, 0, %len		! IEU0
	bne,pn		%icc, ccslow		! CTI
	 andcc		%src, 1, %g0		! IEU1	Group
	bne,pn		%icc, ccslow		! CTI
	 cmp		%len, 256		! IEU1	Group
	bgeu,pt		%icc, csum_partial_copy_vis ! CTI
	 andcc		%src, 7, %g0		! IEU1	Group
	bne,pn		%icc, cc_fixit		! CTI
	 andcc		%len, 0xf0, %g1		! IEU1	Group
ccmerge:be,pn		%icc, ccte		! CTI
	 andcc		%len, 0xf, %g7		! IEU1	Group
	sll		%g1, 2, %o4		! IEU0
13:	sethi		%hi(12f), %o5		! IEU0	Group
	add		%src, %g1, %src		! IEU1	
	sub		%o5, %o4, %o5		! IEU0	Group
	jmpl		%o5 + %lo(12f), %g0	! CTI	Group brk forced
	 add		%dst, %g1, %dst		! IEU0	Group
cctbl:	CSUMCOPY_LASTCHUNK(0xe8,%g2,%g3)
	CSUMCOPY_LASTCHUNK(0xd8,%g2,%g3)
	CSUMCOPY_LASTCHUNK(0xc8,%g2,%g3)
	CSUMCOPY_LASTCHUNK(0xb8,%g2,%g3)
	CSUMCOPY_LASTCHUNK(0xa8,%g2,%g3)
	CSUMCOPY_LASTCHUNK(0x98,%g2,%g3)
	CSUMCOPY_LASTCHUNK(0x88,%g2,%g3)
	CSUMCOPY_LASTCHUNK(0x78,%g2,%g3)
	CSUMCOPY_LASTCHUNK(0x68,%g2,%g3)
	CSUMCOPY_LASTCHUNK(0x58,%g2,%g3)
	CSUMCOPY_LASTCHUNK(0x48,%g2,%g3)
	CSUMCOPY_LASTCHUNK(0x38,%g2,%g3)
	CSUMCOPY_LASTCHUNK(0x28,%g2,%g3)
	CSUMCOPY_LASTCHUNK(0x18,%g2,%g3)
	CSUMCOPY_LASTCHUNK(0x08,%g2,%g3)
12:
	andcc		%len, 0xf, %g7		! IEU1	Group
ccte:	bne,pn		%icc, cc_end_cruft	! CTI
	 sethi		%uhi(PAGE_OFFSET), %g4	! IEU0
ccfold:	sllx		%sum, 32, %o0		! IEU0	Group
	addcc		%sum, %o0, %o0		! IEU1	Group (regdep)
	srlx		%o0, 32, %o0		! IEU0	Group (regdep)
	bcs,a,pn	%xcc, 1f		! CTI
	 add		%o0, 1, %o0		! IEU1	4 clocks (mispredict)
1:	retl					! CTI	Group brk forced
	 sllx		%g4, 32, %g4		! IEU0	Group

ccslow:	mov	0, %g5
	brlez,pn %len, 4f
	 andcc	%src, 1, %o5		
	be,a,pt	%icc, 1f
	 srl	%len, 1, %g7		
	sub	%len, 1, %len	
	lduba [%src] %asi, %g5
	add	%src, 1, %src	
	stb	%g5, [%dst]
	srl	%len, 1, %g7
	add	%dst, 1, %dst
1:	brz,a,pn %g7, 3f
	 andcc	%len, 1, %g0
	andcc	%src, 2, %g0	
	be,a,pt	%icc, 1f
	 srl	%g7, 1, %g7
	lduha [%src] %asi, %o4
	sub	%len, 2, %len	
	srl	%o4, 8, %g2
	sub	%g7, 1, %g7	
	stb	%g2, [%dst]
	add	%o4, %g5, %g5
	stb	%o4, [%dst + 1]
	add	%src, 2, %src	
	srl	%g7, 1, %g7
	add	%dst, 2, %dst
1:	brz,a,pn %g7, 2f		
	 andcc	%len, 2, %g0
	lduwa	[%src] %asi, %o4
5:	srl	%o4, 24, %g2
	srl	%o4, 16, %g3
	stb	%g2, [%dst]
	srl	%o4, 8, %g2
	stb	%g3, [%dst + 1]
	add	%src, 4, %src
	stb	%g2, [%dst + 2]
	addcc	%o4, %g5, %g5
	stb	%o4, [%dst + 3]
	addc	%g5, %g0, %g5
	add	%dst, 4, %dst
	subcc	%g7, 1, %g7
	bne,a,pt %icc, 5b
	 lduwa [%src] %asi, %o4
	sll	%g5, 16, %g2
	srl	%g5, 16, %g5
	srl	%g2, 16, %g2
	andcc	%len, 2, %g0
	add	%g2, %g5, %g5 
2:	be,a,pt	%icc, 3f		
	 andcc	%len, 1, %g0
	lduha [%src] %asi, %o4
	andcc	%len, 1, %g0
	srl	%o4, 8, %g2
	add	%src, 2, %src	
	stb	%g2, [%dst]
	add	%g5, %o4, %g5
	stb	%o4, [%dst + 1]
	add	%dst, 2, %dst
3:	be,a,pt	%icc, 1f		
	 sll	%g5, 16, %o4
	lduba [%src] %asi, %g2
	sll	%g2, 8, %o4	
	stb	%g2, [%dst]
	add	%g5, %o4, %g5
	sll	%g5, 16, %o4
1:	addcc	%o4, %g5, %g5
	srl	%g5, 16, %o4
	addc	%g0, %o4, %g5
	brz,pt	%o5, 4f
	 srl	%g5, 8, %o4
	and	%g5, 0xff, %g2
	and	%o4, 0xff, %o4
	sll	%g2, 8, %g2
	or	%g2, %o4, %g5
4:	addcc	%sum, %g5, %sum
	addc	%g0, %sum, %o0
	retl	
	 srl	%o0, 0, %o0
cpc_end:

	.globl	cpc_handler
cpc_handler:
	ldx	[%sp + 0x7ff + 128], %g1
	sub	%g0, EFAULT, %g2
	brnz,a,pt %g1, 1f
	 st	%g2, [%g1]
1:	sethi	%uhi(PAGE_OFFSET), %g4
	retl
	 sllx	%g4, 32, %g4

	.section __ex_table
	.align  4
	.word  cpc_start, 0, cpc_end, cpc_handler