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-rw-r--r--arch/sparc/lib/NGmemcpy.S425
1 files changed, 425 insertions, 0 deletions
diff --git a/arch/sparc/lib/NGmemcpy.S b/arch/sparc/lib/NGmemcpy.S
new file mode 100644
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1/* NGmemcpy.S: Niagara optimized memcpy.
2 *
3 * Copyright (C) 2006, 2007 David S. Miller (davem@davemloft.net)
4 */
5
6#ifdef __KERNEL__
7#include <asm/asi.h>
8#include <asm/thread_info.h>
9#define GLOBAL_SPARE %g7
10#define RESTORE_ASI(TMP) \
11 ldub [%g6 + TI_CURRENT_DS], TMP; \
12 wr TMP, 0x0, %asi;
13#else
14#define GLOBAL_SPARE %g5
15#define RESTORE_ASI(TMP) \
16 wr %g0, ASI_PNF, %asi
17#endif
18
19#ifdef __sparc_v9__
20#define SAVE_AMOUNT 128
21#else
22#define SAVE_AMOUNT 64
23#endif
24
25#ifndef STORE_ASI
26#define STORE_ASI ASI_BLK_INIT_QUAD_LDD_P
27#endif
28
29#ifndef EX_LD
30#define EX_LD(x) x
31#endif
32
33#ifndef EX_ST
34#define EX_ST(x) x
35#endif
36
37#ifndef EX_RETVAL
38#define EX_RETVAL(x) x
39#endif
40
41#ifndef LOAD
42#ifndef MEMCPY_DEBUG
43#define LOAD(type,addr,dest) type [addr], dest
44#else
45#define LOAD(type,addr,dest) type##a [addr] 0x80, dest
46#endif
47#endif
48
49#ifndef LOAD_TWIN
50#define LOAD_TWIN(addr_reg,dest0,dest1) \
51 ldda [addr_reg] ASI_BLK_INIT_QUAD_LDD_P, dest0
52#endif
53
54#ifndef STORE
55#define STORE(type,src,addr) type src, [addr]
56#endif
57
58#ifndef STORE_INIT
59#ifndef SIMULATE_NIAGARA_ON_NON_NIAGARA
60#define STORE_INIT(src,addr) stxa src, [addr] %asi
61#else
62#define STORE_INIT(src,addr) stx src, [addr + 0x00]
63#endif
64#endif
65
66#ifndef FUNC_NAME
67#define FUNC_NAME NGmemcpy
68#endif
69
70#ifndef PREAMBLE
71#define PREAMBLE
72#endif
73
74#ifndef XCC
75#define XCC xcc
76#endif
77
78 .register %g2,#scratch
79 .register %g3,#scratch
80
81 .text
82 .align 64
83
84 .globl FUNC_NAME
85 .type FUNC_NAME,#function
86FUNC_NAME: /* %i0=dst, %i1=src, %i2=len */
87 PREAMBLE
88 save %sp, -SAVE_AMOUNT, %sp
89 srlx %i2, 31, %g2
90 cmp %g2, 0
91 tne %xcc, 5
92 mov %i0, %o0
93 cmp %i2, 0
94 be,pn %XCC, 85f
95 or %o0, %i1, %i3
96 cmp %i2, 16
97 blu,a,pn %XCC, 80f
98 or %i3, %i2, %i3
99
100 /* 2 blocks (128 bytes) is the minimum we can do the block
101 * copy with. We need to ensure that we'll iterate at least
102 * once in the block copy loop. At worst we'll need to align
103 * the destination to a 64-byte boundary which can chew up
104 * to (64 - 1) bytes from the length before we perform the
105 * block copy loop.
106 */
107 cmp %i2, (2 * 64)
108 blu,pt %XCC, 70f
109 andcc %i3, 0x7, %g0
110
111 /* %o0: dst
112 * %i1: src
113 * %i2: len (known to be >= 128)
114 *
115 * The block copy loops will use %i4/%i5,%g2/%g3 as
116 * temporaries while copying the data.
117 */
118
119 LOAD(prefetch, %i1, #one_read)
120 wr %g0, STORE_ASI, %asi
121
122 /* Align destination on 64-byte boundary. */
123 andcc %o0, (64 - 1), %i4
124 be,pt %XCC, 2f
125 sub %i4, 64, %i4
126 sub %g0, %i4, %i4 ! bytes to align dst
127 sub %i2, %i4, %i2
1281: subcc %i4, 1, %i4
129 EX_LD(LOAD(ldub, %i1, %g1))
130 EX_ST(STORE(stb, %g1, %o0))
131 add %i1, 1, %i1
132 bne,pt %XCC, 1b
133 add %o0, 1, %o0
134
135 /* If the source is on a 16-byte boundary we can do
136 * the direct block copy loop. If it is 8-byte aligned
137 * we can do the 16-byte loads offset by -8 bytes and the
138 * init stores offset by one register.
139 *
140 * If the source is not even 8-byte aligned, we need to do
141 * shifting and masking (basically integer faligndata).
142 *
143 * The careful bit with init stores is that if we store
144 * to any part of the cache line we have to store the whole
145 * cacheline else we can end up with corrupt L2 cache line
146 * contents. Since the loop works on 64-bytes of 64-byte
147 * aligned store data at a time, this is easy to ensure.
148 */
1492:
150 andcc %i1, (16 - 1), %i4
151 andn %i2, (64 - 1), %g1 ! block copy loop iterator
152 be,pt %XCC, 50f
153 sub %i2, %g1, %i2 ! final sub-block copy bytes
154
155 cmp %i4, 8
156 be,pt %XCC, 10f
157 sub %i1, %i4, %i1
158
159 /* Neither 8-byte nor 16-byte aligned, shift and mask. */
160 and %i4, 0x7, GLOBAL_SPARE
161 sll GLOBAL_SPARE, 3, GLOBAL_SPARE
162 mov 64, %i5
163 EX_LD(LOAD_TWIN(%i1, %g2, %g3))
164 sub %i5, GLOBAL_SPARE, %i5
165 mov 16, %o4
166 mov 32, %o5
167 mov 48, %o7
168 mov 64, %i3
169
170 bg,pn %XCC, 9f
171 nop
172
173#define MIX_THREE_WORDS(WORD1, WORD2, WORD3, PRE_SHIFT, POST_SHIFT, TMP) \
174 sllx WORD1, POST_SHIFT, WORD1; \
175 srlx WORD2, PRE_SHIFT, TMP; \
176 sllx WORD2, POST_SHIFT, WORD2; \
177 or WORD1, TMP, WORD1; \
178 srlx WORD3, PRE_SHIFT, TMP; \
179 or WORD2, TMP, WORD2;
180
1818: EX_LD(LOAD_TWIN(%i1 + %o4, %o2, %o3))
182 MIX_THREE_WORDS(%g2, %g3, %o2, %i5, GLOBAL_SPARE, %o1)
183 LOAD(prefetch, %i1 + %i3, #one_read)
184
185 EX_ST(STORE_INIT(%g2, %o0 + 0x00))
186 EX_ST(STORE_INIT(%g3, %o0 + 0x08))
187
188 EX_LD(LOAD_TWIN(%i1 + %o5, %g2, %g3))
189 MIX_THREE_WORDS(%o2, %o3, %g2, %i5, GLOBAL_SPARE, %o1)
190
191 EX_ST(STORE_INIT(%o2, %o0 + 0x10))
192 EX_ST(STORE_INIT(%o3, %o0 + 0x18))
193
194 EX_LD(LOAD_TWIN(%i1 + %o7, %o2, %o3))
195 MIX_THREE_WORDS(%g2, %g3, %o2, %i5, GLOBAL_SPARE, %o1)
196
197 EX_ST(STORE_INIT(%g2, %o0 + 0x20))
198 EX_ST(STORE_INIT(%g3, %o0 + 0x28))
199
200 EX_LD(LOAD_TWIN(%i1 + %i3, %g2, %g3))
201 add %i1, 64, %i1
202 MIX_THREE_WORDS(%o2, %o3, %g2, %i5, GLOBAL_SPARE, %o1)
203
204 EX_ST(STORE_INIT(%o2, %o0 + 0x30))
205 EX_ST(STORE_INIT(%o3, %o0 + 0x38))
206
207 subcc %g1, 64, %g1
208 bne,pt %XCC, 8b
209 add %o0, 64, %o0
210
211 ba,pt %XCC, 60f
212 add %i1, %i4, %i1
213
2149: EX_LD(LOAD_TWIN(%i1 + %o4, %o2, %o3))
215 MIX_THREE_WORDS(%g3, %o2, %o3, %i5, GLOBAL_SPARE, %o1)
216 LOAD(prefetch, %i1 + %i3, #one_read)
217
218 EX_ST(STORE_INIT(%g3, %o0 + 0x00))
219 EX_ST(STORE_INIT(%o2, %o0 + 0x08))
220
221 EX_LD(LOAD_TWIN(%i1 + %o5, %g2, %g3))
222 MIX_THREE_WORDS(%o3, %g2, %g3, %i5, GLOBAL_SPARE, %o1)
223
224 EX_ST(STORE_INIT(%o3, %o0 + 0x10))
225 EX_ST(STORE_INIT(%g2, %o0 + 0x18))
226
227 EX_LD(LOAD_TWIN(%i1 + %o7, %o2, %o3))
228 MIX_THREE_WORDS(%g3, %o2, %o3, %i5, GLOBAL_SPARE, %o1)
229
230 EX_ST(STORE_INIT(%g3, %o0 + 0x20))
231 EX_ST(STORE_INIT(%o2, %o0 + 0x28))
232
233 EX_LD(LOAD_TWIN(%i1 + %i3, %g2, %g3))
234 add %i1, 64, %i1
235 MIX_THREE_WORDS(%o3, %g2, %g3, %i5, GLOBAL_SPARE, %o1)
236
237 EX_ST(STORE_INIT(%o3, %o0 + 0x30))
238 EX_ST(STORE_INIT(%g2, %o0 + 0x38))
239
240 subcc %g1, 64, %g1
241 bne,pt %XCC, 9b
242 add %o0, 64, %o0
243
244 ba,pt %XCC, 60f
245 add %i1, %i4, %i1
246
24710: /* Destination is 64-byte aligned, source was only 8-byte
248 * aligned but it has been subtracted by 8 and we perform
249 * one twin load ahead, then add 8 back into source when
250 * we finish the loop.
251 */
252 EX_LD(LOAD_TWIN(%i1, %o4, %o5))
253 mov 16, %o7
254 mov 32, %g2
255 mov 48, %g3
256 mov 64, %o1
2571: EX_LD(LOAD_TWIN(%i1 + %o7, %o2, %o3))
258 LOAD(prefetch, %i1 + %o1, #one_read)
259 EX_ST(STORE_INIT(%o5, %o0 + 0x00)) ! initializes cache line
260 EX_ST(STORE_INIT(%o2, %o0 + 0x08))
261 EX_LD(LOAD_TWIN(%i1 + %g2, %o4, %o5))
262 EX_ST(STORE_INIT(%o3, %o0 + 0x10))
263 EX_ST(STORE_INIT(%o4, %o0 + 0x18))
264 EX_LD(LOAD_TWIN(%i1 + %g3, %o2, %o3))
265 EX_ST(STORE_INIT(%o5, %o0 + 0x20))
266 EX_ST(STORE_INIT(%o2, %o0 + 0x28))
267 EX_LD(LOAD_TWIN(%i1 + %o1, %o4, %o5))
268 add %i1, 64, %i1
269 EX_ST(STORE_INIT(%o3, %o0 + 0x30))
270 EX_ST(STORE_INIT(%o4, %o0 + 0x38))
271 subcc %g1, 64, %g1
272 bne,pt %XCC, 1b
273 add %o0, 64, %o0
274
275 ba,pt %XCC, 60f
276 add %i1, 0x8, %i1
277
27850: /* Destination is 64-byte aligned, and source is 16-byte
279 * aligned.
280 */
281 mov 16, %o7
282 mov 32, %g2
283 mov 48, %g3
284 mov 64, %o1
2851: EX_LD(LOAD_TWIN(%i1 + %g0, %o4, %o5))
286 EX_LD(LOAD_TWIN(%i1 + %o7, %o2, %o3))
287 LOAD(prefetch, %i1 + %o1, #one_read)
288 EX_ST(STORE_INIT(%o4, %o0 + 0x00)) ! initializes cache line
289 EX_ST(STORE_INIT(%o5, %o0 + 0x08))
290 EX_LD(LOAD_TWIN(%i1 + %g2, %o4, %o5))
291 EX_ST(STORE_INIT(%o2, %o0 + 0x10))
292 EX_ST(STORE_INIT(%o3, %o0 + 0x18))
293 EX_LD(LOAD_TWIN(%i1 + %g3, %o2, %o3))
294 add %i1, 64, %i1
295 EX_ST(STORE_INIT(%o4, %o0 + 0x20))
296 EX_ST(STORE_INIT(%o5, %o0 + 0x28))
297 EX_ST(STORE_INIT(%o2, %o0 + 0x30))
298 EX_ST(STORE_INIT(%o3, %o0 + 0x38))
299 subcc %g1, 64, %g1
300 bne,pt %XCC, 1b
301 add %o0, 64, %o0
302 /* fall through */
303
30460:
305 membar #Sync
306
307 /* %i2 contains any final bytes still needed to be copied
308 * over. If anything is left, we copy it one byte at a time.
309 */
310 RESTORE_ASI(%i3)
311 brz,pt %i2, 85f
312 sub %o0, %i1, %i3
313 ba,a,pt %XCC, 90f
314
315 .align 64
31670: /* 16 < len <= 64 */
317 bne,pn %XCC, 75f
318 sub %o0, %i1, %i3
319
32072:
321 andn %i2, 0xf, %i4
322 and %i2, 0xf, %i2
3231: subcc %i4, 0x10, %i4
324 EX_LD(LOAD(ldx, %i1, %o4))
325 add %i1, 0x08, %i1
326 EX_LD(LOAD(ldx, %i1, %g1))
327 sub %i1, 0x08, %i1
328 EX_ST(STORE(stx, %o4, %i1 + %i3))
329 add %i1, 0x8, %i1
330 EX_ST(STORE(stx, %g1, %i1 + %i3))
331 bgu,pt %XCC, 1b
332 add %i1, 0x8, %i1
33373: andcc %i2, 0x8, %g0
334 be,pt %XCC, 1f
335 nop
336 sub %i2, 0x8, %i2
337 EX_LD(LOAD(ldx, %i1, %o4))
338 EX_ST(STORE(stx, %o4, %i1 + %i3))
339 add %i1, 0x8, %i1
3401: andcc %i2, 0x4, %g0
341 be,pt %XCC, 1f
342 nop
343 sub %i2, 0x4, %i2
344 EX_LD(LOAD(lduw, %i1, %i5))
345 EX_ST(STORE(stw, %i5, %i1 + %i3))
346 add %i1, 0x4, %i1
3471: cmp %i2, 0
348 be,pt %XCC, 85f
349 nop
350 ba,pt %xcc, 90f
351 nop
352
35375:
354 andcc %o0, 0x7, %g1
355 sub %g1, 0x8, %g1
356 be,pn %icc, 2f
357 sub %g0, %g1, %g1
358 sub %i2, %g1, %i2
359
3601: subcc %g1, 1, %g1
361 EX_LD(LOAD(ldub, %i1, %i5))
362 EX_ST(STORE(stb, %i5, %i1 + %i3))
363 bgu,pt %icc, 1b
364 add %i1, 1, %i1
365
3662: add %i1, %i3, %o0
367 andcc %i1, 0x7, %g1
368 bne,pt %icc, 8f
369 sll %g1, 3, %g1
370
371 cmp %i2, 16
372 bgeu,pt %icc, 72b
373 nop
374 ba,a,pt %xcc, 73b
375
3768: mov 64, %i3
377 andn %i1, 0x7, %i1
378 EX_LD(LOAD(ldx, %i1, %g2))
379 sub %i3, %g1, %i3
380 andn %i2, 0x7, %i4
381 sllx %g2, %g1, %g2
3821: add %i1, 0x8, %i1
383 EX_LD(LOAD(ldx, %i1, %g3))
384 subcc %i4, 0x8, %i4
385 srlx %g3, %i3, %i5
386 or %i5, %g2, %i5
387 EX_ST(STORE(stx, %i5, %o0))
388 add %o0, 0x8, %o0
389 bgu,pt %icc, 1b
390 sllx %g3, %g1, %g2
391
392 srl %g1, 3, %g1
393 andcc %i2, 0x7, %i2
394 be,pn %icc, 85f
395 add %i1, %g1, %i1
396 ba,pt %xcc, 90f
397 sub %o0, %i1, %i3
398
399 .align 64
40080: /* 0 < len <= 16 */
401 andcc %i3, 0x3, %g0
402 bne,pn %XCC, 90f
403 sub %o0, %i1, %i3
404
4051:
406 subcc %i2, 4, %i2
407 EX_LD(LOAD(lduw, %i1, %g1))
408 EX_ST(STORE(stw, %g1, %i1 + %i3))
409 bgu,pt %XCC, 1b
410 add %i1, 4, %i1
411
41285: ret
413 restore EX_RETVAL(%i0), %g0, %o0
414
415 .align 32
41690:
417 subcc %i2, 1, %i2
418 EX_LD(LOAD(ldub, %i1, %g1))
419 EX_ST(STORE(stb, %g1, %i1 + %i3))
420 bgu,pt %XCC, 90b
421 add %i1, 1, %i1
422 ret
423 restore EX_RETVAL(%i0), %g0, %o0
424
425 .size FUNC_NAME, .-FUNC_NAME
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