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[mirror_ubuntu-zesty-kernel.git] / arch / sparc / lib / NG2memcpy.S
1 /* NG2memcpy.S: Niagara-2 optimized memcpy.
2 *
3 * Copyright (C) 2007 David S. Miller (davem@davemloft.net)
4 */
5
6 #ifdef __KERNEL__
7 #include <asm/visasm.h>
8 #include <asm/asi.h>
9 #define GLOBAL_SPARE %g7
10 #else
11 #define ASI_PNF 0x82
12 #define ASI_BLK_P 0xf0
13 #define ASI_BLK_INIT_QUAD_LDD_P 0xe2
14 #define FPRS_FEF 0x04
15 #ifdef MEMCPY_DEBUG
16 #define VISEntryHalf rd %fprs, %o5; wr %g0, FPRS_FEF, %fprs; \
17 clr %g1; clr %g2; clr %g3; clr %g5; subcc %g0, %g0, %g0;
18 #define VISExitHalf and %o5, FPRS_FEF, %o5; wr %o5, 0x0, %fprs
19 #else
20 #define VISEntryHalf rd %fprs, %o5; wr %g0, FPRS_FEF, %fprs
21 #define VISExitHalf and %o5, FPRS_FEF, %o5; wr %o5, 0x0, %fprs
22 #endif
23 #define GLOBAL_SPARE %g5
24 #endif
25
26 #ifndef STORE_ASI
27 #ifndef SIMULATE_NIAGARA_ON_NON_NIAGARA
28 #define STORE_ASI ASI_BLK_INIT_QUAD_LDD_P
29 #else
30 #define STORE_ASI 0x80 /* ASI_P */
31 #endif
32 #endif
33
34 #ifndef EX_LD
35 #define EX_LD(x) x
36 #endif
37 #ifndef EX_LD_FP
38 #define EX_LD_FP(x) x
39 #endif
40
41 #ifndef EX_ST
42 #define EX_ST(x) x
43 #endif
44 #ifndef EX_ST_FP
45 #define EX_ST_FP(x) x
46 #endif
47
48 #ifndef EX_RETVAL
49 #define EX_RETVAL(x) x
50 #endif
51
52 #ifndef LOAD
53 #define LOAD(type,addr,dest) type [addr], dest
54 #endif
55
56 #ifndef LOAD_BLK
57 #define LOAD_BLK(addr,dest) ldda [addr] ASI_BLK_P, dest
58 #endif
59
60 #ifndef STORE
61 #ifndef MEMCPY_DEBUG
62 #define STORE(type,src,addr) type src, [addr]
63 #else
64 #define STORE(type,src,addr) type##a src, [addr] 0x80
65 #endif
66 #endif
67
68 #ifndef STORE_BLK
69 #define STORE_BLK(src,addr) stda src, [addr] ASI_BLK_P
70 #endif
71
72 #ifndef STORE_INIT
73 #define STORE_INIT(src,addr) stxa src, [addr] STORE_ASI
74 #endif
75
76 #ifndef FUNC_NAME
77 #define FUNC_NAME NG2memcpy
78 #endif
79
80 #ifndef PREAMBLE
81 #define PREAMBLE
82 #endif
83
84 #ifndef XCC
85 #define XCC xcc
86 #endif
87
88 #define FREG_FROB(x0, x1, x2, x3, x4, x5, x6, x7, x8) \
89 faligndata %x0, %x1, %f0; \
90 faligndata %x1, %x2, %f2; \
91 faligndata %x2, %x3, %f4; \
92 faligndata %x3, %x4, %f6; \
93 faligndata %x4, %x5, %f8; \
94 faligndata %x5, %x6, %f10; \
95 faligndata %x6, %x7, %f12; \
96 faligndata %x7, %x8, %f14;
97
98 #define FREG_MOVE_1(x0) \
99 fsrc2 %x0, %f0;
100 #define FREG_MOVE_2(x0, x1) \
101 fsrc2 %x0, %f0; \
102 fsrc2 %x1, %f2;
103 #define FREG_MOVE_3(x0, x1, x2) \
104 fsrc2 %x0, %f0; \
105 fsrc2 %x1, %f2; \
106 fsrc2 %x2, %f4;
107 #define FREG_MOVE_4(x0, x1, x2, x3) \
108 fsrc2 %x0, %f0; \
109 fsrc2 %x1, %f2; \
110 fsrc2 %x2, %f4; \
111 fsrc2 %x3, %f6;
112 #define FREG_MOVE_5(x0, x1, x2, x3, x4) \
113 fsrc2 %x0, %f0; \
114 fsrc2 %x1, %f2; \
115 fsrc2 %x2, %f4; \
116 fsrc2 %x3, %f6; \
117 fsrc2 %x4, %f8;
118 #define FREG_MOVE_6(x0, x1, x2, x3, x4, x5) \
119 fsrc2 %x0, %f0; \
120 fsrc2 %x1, %f2; \
121 fsrc2 %x2, %f4; \
122 fsrc2 %x3, %f6; \
123 fsrc2 %x4, %f8; \
124 fsrc2 %x5, %f10;
125 #define FREG_MOVE_7(x0, x1, x2, x3, x4, x5, x6) \
126 fsrc2 %x0, %f0; \
127 fsrc2 %x1, %f2; \
128 fsrc2 %x2, %f4; \
129 fsrc2 %x3, %f6; \
130 fsrc2 %x4, %f8; \
131 fsrc2 %x5, %f10; \
132 fsrc2 %x6, %f12;
133 #define FREG_MOVE_8(x0, x1, x2, x3, x4, x5, x6, x7) \
134 fsrc2 %x0, %f0; \
135 fsrc2 %x1, %f2; \
136 fsrc2 %x2, %f4; \
137 fsrc2 %x3, %f6; \
138 fsrc2 %x4, %f8; \
139 fsrc2 %x5, %f10; \
140 fsrc2 %x6, %f12; \
141 fsrc2 %x7, %f14;
142 #define FREG_LOAD_1(base, x0) \
143 EX_LD_FP(LOAD(ldd, base + 0x00, %x0))
144 #define FREG_LOAD_2(base, x0, x1) \
145 EX_LD_FP(LOAD(ldd, base + 0x00, %x0)); \
146 EX_LD_FP(LOAD(ldd, base + 0x08, %x1));
147 #define FREG_LOAD_3(base, x0, x1, x2) \
148 EX_LD_FP(LOAD(ldd, base + 0x00, %x0)); \
149 EX_LD_FP(LOAD(ldd, base + 0x08, %x1)); \
150 EX_LD_FP(LOAD(ldd, base + 0x10, %x2));
151 #define FREG_LOAD_4(base, x0, x1, x2, x3) \
152 EX_LD_FP(LOAD(ldd, base + 0x00, %x0)); \
153 EX_LD_FP(LOAD(ldd, base + 0x08, %x1)); \
154 EX_LD_FP(LOAD(ldd, base + 0x10, %x2)); \
155 EX_LD_FP(LOAD(ldd, base + 0x18, %x3));
156 #define FREG_LOAD_5(base, x0, x1, x2, x3, x4) \
157 EX_LD_FP(LOAD(ldd, base + 0x00, %x0)); \
158 EX_LD_FP(LOAD(ldd, base + 0x08, %x1)); \
159 EX_LD_FP(LOAD(ldd, base + 0x10, %x2)); \
160 EX_LD_FP(LOAD(ldd, base + 0x18, %x3)); \
161 EX_LD_FP(LOAD(ldd, base + 0x20, %x4));
162 #define FREG_LOAD_6(base, x0, x1, x2, x3, x4, x5) \
163 EX_LD_FP(LOAD(ldd, base + 0x00, %x0)); \
164 EX_LD_FP(LOAD(ldd, base + 0x08, %x1)); \
165 EX_LD_FP(LOAD(ldd, base + 0x10, %x2)); \
166 EX_LD_FP(LOAD(ldd, base + 0x18, %x3)); \
167 EX_LD_FP(LOAD(ldd, base + 0x20, %x4)); \
168 EX_LD_FP(LOAD(ldd, base + 0x28, %x5));
169 #define FREG_LOAD_7(base, x0, x1, x2, x3, x4, x5, x6) \
170 EX_LD_FP(LOAD(ldd, base + 0x00, %x0)); \
171 EX_LD_FP(LOAD(ldd, base + 0x08, %x1)); \
172 EX_LD_FP(LOAD(ldd, base + 0x10, %x2)); \
173 EX_LD_FP(LOAD(ldd, base + 0x18, %x3)); \
174 EX_LD_FP(LOAD(ldd, base + 0x20, %x4)); \
175 EX_LD_FP(LOAD(ldd, base + 0x28, %x5)); \
176 EX_LD_FP(LOAD(ldd, base + 0x30, %x6));
177
178 .register %g2,#scratch
179 .register %g3,#scratch
180
181 .text
182 .align 64
183
184 .globl FUNC_NAME
185 .type FUNC_NAME,#function
186 FUNC_NAME: /* %o0=dst, %o1=src, %o2=len */
187 srlx %o2, 31, %g2
188 cmp %g2, 0
189 tne %xcc, 5
190 PREAMBLE
191 mov %o0, %o3
192 cmp %o2, 0
193 be,pn %XCC, 85f
194 or %o0, %o1, GLOBAL_SPARE
195 cmp %o2, 16
196 blu,a,pn %XCC, 80f
197 or GLOBAL_SPARE, %o2, GLOBAL_SPARE
198
199 /* 2 blocks (128 bytes) is the minimum we can do the block
200 * copy with. We need to ensure that we'll iterate at least
201 * once in the block copy loop. At worst we'll need to align
202 * the destination to a 64-byte boundary which can chew up
203 * to (64 - 1) bytes from the length before we perform the
204 * block copy loop.
205 *
206 * However, the cut-off point, performance wise, is around
207 * 4 64-byte blocks.
208 */
209 cmp %o2, (4 * 64)
210 blu,pt %XCC, 75f
211 andcc GLOBAL_SPARE, 0x7, %g0
212
213 /* %o0: dst
214 * %o1: src
215 * %o2: len (known to be >= 128)
216 *
217 * The block copy loops can use %o4, %g2, %g3 as
218 * temporaries while copying the data. %o5 must
219 * be preserved between VISEntryHalf and VISExitHalf
220 */
221
222 LOAD(prefetch, %o1 + 0x000, #one_read)
223 LOAD(prefetch, %o1 + 0x040, #one_read)
224 LOAD(prefetch, %o1 + 0x080, #one_read)
225
226 /* Align destination on 64-byte boundary. */
227 andcc %o0, (64 - 1), %o4
228 be,pt %XCC, 2f
229 sub %o4, 64, %o4
230 sub %g0, %o4, %o4 ! bytes to align dst
231 sub %o2, %o4, %o2
232 1: subcc %o4, 1, %o4
233 EX_LD(LOAD(ldub, %o1, %g1))
234 EX_ST(STORE(stb, %g1, %o0))
235 add %o1, 1, %o1
236 bne,pt %XCC, 1b
237 add %o0, 1, %o0
238
239 2:
240 /* Clobbers o5/g1/g2/g3/g7/icc/xcc. We must preserve
241 * o5 from here until we hit VISExitHalf.
242 */
243 VISEntryHalf
244
245 membar #Sync
246 alignaddr %o1, %g0, %g0
247
248 add %o1, (64 - 1), %o4
249 andn %o4, (64 - 1), %o4
250 andn %o2, (64 - 1), %g1
251 sub %o2, %g1, %o2
252
253 and %o1, (64 - 1), %g2
254 add %o1, %g1, %o1
255 sub %o0, %o4, %g3
256 brz,pt %g2, 190f
257 cmp %g2, 32
258 blu,a 5f
259 cmp %g2, 16
260 cmp %g2, 48
261 blu,a 4f
262 cmp %g2, 40
263 cmp %g2, 56
264 blu 170f
265 nop
266 ba,a,pt %xcc, 180f
267
268 4: /* 32 <= low bits < 48 */
269 blu 150f
270 nop
271 ba,a,pt %xcc, 160f
272 5: /* 0 < low bits < 32 */
273 blu,a 6f
274 cmp %g2, 8
275 cmp %g2, 24
276 blu 130f
277 nop
278 ba,a,pt %xcc, 140f
279 6: /* 0 < low bits < 16 */
280 bgeu 120f
281 nop
282 /* fall through for 0 < low bits < 8 */
283 110: sub %o4, 64, %g2
284 EX_LD_FP(LOAD_BLK(%g2, %f0))
285 1: EX_ST_FP(STORE_INIT(%g0, %o4 + %g3))
286 EX_LD_FP(LOAD_BLK(%o4, %f16))
287 FREG_FROB(f0, f2, f4, f6, f8, f10, f12, f14, f16)
288 EX_ST_FP(STORE_BLK(%f0, %o4 + %g3))
289 FREG_MOVE_8(f16, f18, f20, f22, f24, f26, f28, f30)
290 subcc %g1, 64, %g1
291 add %o4, 64, %o4
292 bne,pt %xcc, 1b
293 LOAD(prefetch, %o4 + 64, #one_read)
294 ba,pt %xcc, 195f
295 nop
296
297 120: sub %o4, 56, %g2
298 FREG_LOAD_7(%g2, f0, f2, f4, f6, f8, f10, f12)
299 1: EX_ST_FP(STORE_INIT(%g0, %o4 + %g3))
300 EX_LD_FP(LOAD_BLK(%o4, %f16))
301 FREG_FROB(f0, f2, f4, f6, f8, f10, f12, f16, f18)
302 EX_ST_FP(STORE_BLK(%f0, %o4 + %g3))
303 FREG_MOVE_7(f18, f20, f22, f24, f26, f28, f30)
304 subcc %g1, 64, %g1
305 add %o4, 64, %o4
306 bne,pt %xcc, 1b
307 LOAD(prefetch, %o4 + 64, #one_read)
308 ba,pt %xcc, 195f
309 nop
310
311 130: sub %o4, 48, %g2
312 FREG_LOAD_6(%g2, f0, f2, f4, f6, f8, f10)
313 1: EX_ST_FP(STORE_INIT(%g0, %o4 + %g3))
314 EX_LD_FP(LOAD_BLK(%o4, %f16))
315 FREG_FROB(f0, f2, f4, f6, f8, f10, f16, f18, f20)
316 EX_ST_FP(STORE_BLK(%f0, %o4 + %g3))
317 FREG_MOVE_6(f20, f22, f24, f26, f28, f30)
318 subcc %g1, 64, %g1
319 add %o4, 64, %o4
320 bne,pt %xcc, 1b
321 LOAD(prefetch, %o4 + 64, #one_read)
322 ba,pt %xcc, 195f
323 nop
324
325 140: sub %o4, 40, %g2
326 FREG_LOAD_5(%g2, f0, f2, f4, f6, f8)
327 1: EX_ST_FP(STORE_INIT(%g0, %o4 + %g3))
328 EX_LD_FP(LOAD_BLK(%o4, %f16))
329 FREG_FROB(f0, f2, f4, f6, f8, f16, f18, f20, f22)
330 EX_ST_FP(STORE_BLK(%f0, %o4 + %g3))
331 FREG_MOVE_5(f22, f24, f26, f28, f30)
332 subcc %g1, 64, %g1
333 add %o4, 64, %o4
334 bne,pt %xcc, 1b
335 LOAD(prefetch, %o4 + 64, #one_read)
336 ba,pt %xcc, 195f
337 nop
338
339 150: sub %o4, 32, %g2
340 FREG_LOAD_4(%g2, f0, f2, f4, f6)
341 1: EX_ST_FP(STORE_INIT(%g0, %o4 + %g3))
342 EX_LD_FP(LOAD_BLK(%o4, %f16))
343 FREG_FROB(f0, f2, f4, f6, f16, f18, f20, f22, f24)
344 EX_ST_FP(STORE_BLK(%f0, %o4 + %g3))
345 FREG_MOVE_4(f24, f26, f28, f30)
346 subcc %g1, 64, %g1
347 add %o4, 64, %o4
348 bne,pt %xcc, 1b
349 LOAD(prefetch, %o4 + 64, #one_read)
350 ba,pt %xcc, 195f
351 nop
352
353 160: sub %o4, 24, %g2
354 FREG_LOAD_3(%g2, f0, f2, f4)
355 1: EX_ST_FP(STORE_INIT(%g0, %o4 + %g3))
356 EX_LD_FP(LOAD_BLK(%o4, %f16))
357 FREG_FROB(f0, f2, f4, f16, f18, f20, f22, f24, f26)
358 EX_ST_FP(STORE_BLK(%f0, %o4 + %g3))
359 FREG_MOVE_3(f26, f28, f30)
360 subcc %g1, 64, %g1
361 add %o4, 64, %o4
362 bne,pt %xcc, 1b
363 LOAD(prefetch, %o4 + 64, #one_read)
364 ba,pt %xcc, 195f
365 nop
366
367 170: sub %o4, 16, %g2
368 FREG_LOAD_2(%g2, f0, f2)
369 1: EX_ST_FP(STORE_INIT(%g0, %o4 + %g3))
370 EX_LD_FP(LOAD_BLK(%o4, %f16))
371 FREG_FROB(f0, f2, f16, f18, f20, f22, f24, f26, f28)
372 EX_ST_FP(STORE_BLK(%f0, %o4 + %g3))
373 FREG_MOVE_2(f28, f30)
374 subcc %g1, 64, %g1
375 add %o4, 64, %o4
376 bne,pt %xcc, 1b
377 LOAD(prefetch, %o4 + 64, #one_read)
378 ba,pt %xcc, 195f
379 nop
380
381 180: sub %o4, 8, %g2
382 FREG_LOAD_1(%g2, f0)
383 1: EX_ST_FP(STORE_INIT(%g0, %o4 + %g3))
384 EX_LD_FP(LOAD_BLK(%o4, %f16))
385 FREG_FROB(f0, f16, f18, f20, f22, f24, f26, f28, f30)
386 EX_ST_FP(STORE_BLK(%f0, %o4 + %g3))
387 FREG_MOVE_1(f30)
388 subcc %g1, 64, %g1
389 add %o4, 64, %o4
390 bne,pt %xcc, 1b
391 LOAD(prefetch, %o4 + 64, #one_read)
392 ba,pt %xcc, 195f
393 nop
394
395 190:
396 1: EX_ST_FP(STORE_INIT(%g0, %o4 + %g3))
397 subcc %g1, 64, %g1
398 EX_LD_FP(LOAD_BLK(%o4, %f0))
399 EX_ST_FP(STORE_BLK(%f0, %o4 + %g3))
400 add %o4, 64, %o4
401 bne,pt %xcc, 1b
402 LOAD(prefetch, %o4 + 64, #one_read)
403
404 195:
405 add %o4, %g3, %o0
406 membar #Sync
407
408 VISExitHalf
409
410 /* %o2 contains any final bytes still needed to be copied
411 * over. If anything is left, we copy it one byte at a time.
412 */
413 brz,pt %o2, 85f
414 sub %o0, %o1, GLOBAL_SPARE
415 ba,a,pt %XCC, 90f
416
417 .align 64
418 75: /* 16 < len <= 64 */
419 bne,pn %XCC, 75f
420 sub %o0, %o1, GLOBAL_SPARE
421
422 72:
423 andn %o2, 0xf, %o4
424 and %o2, 0xf, %o2
425 1: subcc %o4, 0x10, %o4
426 EX_LD(LOAD(ldx, %o1, %o5))
427 add %o1, 0x08, %o1
428 EX_LD(LOAD(ldx, %o1, %g1))
429 sub %o1, 0x08, %o1
430 EX_ST(STORE(stx, %o5, %o1 + GLOBAL_SPARE))
431 add %o1, 0x8, %o1
432 EX_ST(STORE(stx, %g1, %o1 + GLOBAL_SPARE))
433 bgu,pt %XCC, 1b
434 add %o1, 0x8, %o1
435 73: andcc %o2, 0x8, %g0
436 be,pt %XCC, 1f
437 nop
438 sub %o2, 0x8, %o2
439 EX_LD(LOAD(ldx, %o1, %o5))
440 EX_ST(STORE(stx, %o5, %o1 + GLOBAL_SPARE))
441 add %o1, 0x8, %o1
442 1: andcc %o2, 0x4, %g0
443 be,pt %XCC, 1f
444 nop
445 sub %o2, 0x4, %o2
446 EX_LD(LOAD(lduw, %o1, %o5))
447 EX_ST(STORE(stw, %o5, %o1 + GLOBAL_SPARE))
448 add %o1, 0x4, %o1
449 1: cmp %o2, 0
450 be,pt %XCC, 85f
451 nop
452 ba,pt %xcc, 90f
453 nop
454
455 75:
456 andcc %o0, 0x7, %g1
457 sub %g1, 0x8, %g1
458 be,pn %icc, 2f
459 sub %g0, %g1, %g1
460 sub %o2, %g1, %o2
461
462 1: subcc %g1, 1, %g1
463 EX_LD(LOAD(ldub, %o1, %o5))
464 EX_ST(STORE(stb, %o5, %o1 + GLOBAL_SPARE))
465 bgu,pt %icc, 1b
466 add %o1, 1, %o1
467
468 2: add %o1, GLOBAL_SPARE, %o0
469 andcc %o1, 0x7, %g1
470 bne,pt %icc, 8f
471 sll %g1, 3, %g1
472
473 cmp %o2, 16
474 bgeu,pt %icc, 72b
475 nop
476 ba,a,pt %xcc, 73b
477
478 8: mov 64, GLOBAL_SPARE
479 andn %o1, 0x7, %o1
480 EX_LD(LOAD(ldx, %o1, %g2))
481 sub GLOBAL_SPARE, %g1, GLOBAL_SPARE
482 andn %o2, 0x7, %o4
483 sllx %g2, %g1, %g2
484 1: add %o1, 0x8, %o1
485 EX_LD(LOAD(ldx, %o1, %g3))
486 subcc %o4, 0x8, %o4
487 srlx %g3, GLOBAL_SPARE, %o5
488 or %o5, %g2, %o5
489 EX_ST(STORE(stx, %o5, %o0))
490 add %o0, 0x8, %o0
491 bgu,pt %icc, 1b
492 sllx %g3, %g1, %g2
493
494 srl %g1, 3, %g1
495 andcc %o2, 0x7, %o2
496 be,pn %icc, 85f
497 add %o1, %g1, %o1
498 ba,pt %xcc, 90f
499 sub %o0, %o1, GLOBAL_SPARE
500
501 .align 64
502 80: /* 0 < len <= 16 */
503 andcc GLOBAL_SPARE, 0x3, %g0
504 bne,pn %XCC, 90f
505 sub %o0, %o1, GLOBAL_SPARE
506
507 1:
508 subcc %o2, 4, %o2
509 EX_LD(LOAD(lduw, %o1, %g1))
510 EX_ST(STORE(stw, %g1, %o1 + GLOBAL_SPARE))
511 bgu,pt %XCC, 1b
512 add %o1, 4, %o1
513
514 85: retl
515 mov EX_RETVAL(%o3), %o0
516
517 .align 32
518 90:
519 subcc %o2, 1, %o2
520 EX_LD(LOAD(ldub, %o1, %g1))
521 EX_ST(STORE(stb, %g1, %o1 + GLOBAL_SPARE))
522 bgu,pt %XCC, 90b
523 add %o1, 1, %o1
524 retl
525 mov EX_RETVAL(%o3), %o0
526
527 .size FUNC_NAME, .-FUNC_NAME
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