xref: /openbmc/linux/arch/sparc/lib/NG4memcpy.S (revision a8da474e) 
1/* NG4memcpy.S: Niagara-4 optimized memcpy.
2 *
3 * Copyright (C) 2012 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_BLK_INIT_QUAD_LDD_P 0xe2
12#define FPRS_FEF  0x04
13
14/* On T4 it is very expensive to access ASRs like %fprs and
15 * %asi, avoiding a read or a write can save ~50 cycles.
16 */
17#define FPU_ENTER			\
18	rd	%fprs, %o5;		\
19	andcc	%o5, FPRS_FEF, %g0;	\
20	be,a,pn	%icc, 999f;		\
21	 wr	%g0, FPRS_FEF, %fprs;	\
22	999:
23
24#ifdef MEMCPY_DEBUG
25#define VISEntryHalf FPU_ENTER; \
26		     clr %g1; clr %g2; clr %g3; clr %g5; subcc %g0, %g0, %g0;
27#define VISExitHalf and %o5, FPRS_FEF, %o5; wr %o5, 0x0, %fprs
28#else
29#define VISEntryHalf FPU_ENTER
30#define VISExitHalf and %o5, FPRS_FEF, %o5; wr %o5, 0x0, %fprs
31#endif
32
33#define GLOBAL_SPARE	%g5
34#endif
35
36#ifndef STORE_ASI
37#ifndef SIMULATE_NIAGARA_ON_NON_NIAGARA
38#define STORE_ASI	ASI_BLK_INIT_QUAD_LDD_P
39#else
40#define STORE_ASI	0x80		/* ASI_P */
41#endif
42#endif
43
44#if !defined(EX_LD) && !defined(EX_ST)
45#define NON_USER_COPY
46#endif
47
48#ifndef EX_LD
49#define EX_LD(x)	x
50#endif
51
52#ifndef EX_ST
53#define EX_ST(x)	x
54#endif
55
56#ifndef EX_RETVAL
57#define EX_RETVAL(x)	x
58#endif
59
60#ifndef LOAD
61#define LOAD(type,addr,dest)	type [addr], dest
62#endif
63
64#ifndef STORE
65#ifndef MEMCPY_DEBUG
66#define STORE(type,src,addr)	type src, [addr]
67#else
68#define STORE(type,src,addr)	type##a src, [addr] %asi
69#endif
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	NG4memcpy
78#endif
79#ifndef PREAMBLE
80#define PREAMBLE
81#endif
82
83#ifndef XCC
84#define XCC xcc
85#endif
86
87	.register	%g2,#scratch
88	.register	%g3,#scratch
89
90	.text
91	.align		64
92
93	.globl	FUNC_NAME
94	.type	FUNC_NAME,#function
95FUNC_NAME:	/* %o0=dst, %o1=src, %o2=len */
96#ifdef MEMCPY_DEBUG
97	wr		%g0, 0x80, %asi
98#endif
99	srlx		%o2, 31, %g2
100	cmp		%g2, 0
101	tne		%XCC, 5
102	PREAMBLE
103	mov		%o0, %o3
104	brz,pn		%o2, .Lexit
105	 cmp		%o2, 3
106	ble,pn		%icc, .Ltiny
107	 cmp		%o2, 19
108	ble,pn		%icc, .Lsmall
109	 or		%o0, %o1, %g2
110	cmp		%o2, 128
111	bl,pn		%icc, .Lmedium
112	 nop
113
114.Llarge:/* len >= 0x80 */
115	/* First get dest 8 byte aligned.  */
116	sub		%g0, %o0, %g1
117	and		%g1, 0x7, %g1
118	brz,pt		%g1, 51f
119	 sub		%o2, %g1, %o2
120
1211:	EX_LD(LOAD(ldub, %o1 + 0x00, %g2))
122	add		%o1, 1, %o1
123	subcc		%g1, 1, %g1
124	add		%o0, 1, %o0
125	bne,pt		%icc, 1b
126	 EX_ST(STORE(stb, %g2, %o0 - 0x01))
127
12851:	LOAD(prefetch, %o1 + 0x040, #n_reads_strong)
129	LOAD(prefetch, %o1 + 0x080, #n_reads_strong)
130	LOAD(prefetch, %o1 + 0x0c0, #n_reads_strong)
131	LOAD(prefetch, %o1 + 0x100, #n_reads_strong)
132	LOAD(prefetch, %o1 + 0x140, #n_reads_strong)
133	LOAD(prefetch, %o1 + 0x180, #n_reads_strong)
134	LOAD(prefetch, %o1 + 0x1c0, #n_reads_strong)
135	LOAD(prefetch, %o1 + 0x200, #n_reads_strong)
136
137	/* Check if we can use the straight fully aligned
138	 * loop, or we require the alignaddr/faligndata variant.
139	 */
140	andcc		%o1, 0x7, %o5
141	bne,pn		%icc, .Llarge_src_unaligned
142	 sub		%g0, %o0, %g1
143
144	/* Legitimize the use of initializing stores by getting dest
145	 * to be 64-byte aligned.
146	 */
147	and		%g1, 0x3f, %g1
148	brz,pt		%g1, .Llarge_aligned
149	 sub		%o2, %g1, %o2
150
1511:	EX_LD(LOAD(ldx, %o1 + 0x00, %g2))
152	add		%o1, 8, %o1
153	subcc		%g1, 8, %g1
154	add		%o0, 8, %o0
155	bne,pt		%icc, 1b
156	 EX_ST(STORE(stx, %g2, %o0 - 0x08))
157
158.Llarge_aligned:
159	/* len >= 0x80 && src 8-byte aligned && dest 8-byte aligned */
160	andn		%o2, 0x3f, %o4
161	sub		%o2, %o4, %o2
162
1631:	EX_LD(LOAD(ldx, %o1 + 0x00, %g1))
164	add		%o1, 0x40, %o1
165	EX_LD(LOAD(ldx, %o1 - 0x38, %g2))
166	subcc		%o4, 0x40, %o4
167	EX_LD(LOAD(ldx, %o1 - 0x30, %g3))
168	EX_LD(LOAD(ldx, %o1 - 0x28, GLOBAL_SPARE))
169	EX_LD(LOAD(ldx, %o1 - 0x20, %o5))
170	EX_ST(STORE_INIT(%g1, %o0))
171	add		%o0, 0x08, %o0
172	EX_ST(STORE_INIT(%g2, %o0))
173	add		%o0, 0x08, %o0
174	EX_LD(LOAD(ldx, %o1 - 0x18, %g2))
175	EX_ST(STORE_INIT(%g3, %o0))
176	add		%o0, 0x08, %o0
177	EX_LD(LOAD(ldx, %o1 - 0x10, %g3))
178	EX_ST(STORE_INIT(GLOBAL_SPARE, %o0))
179	add		%o0, 0x08, %o0
180	EX_LD(LOAD(ldx, %o1 - 0x08, GLOBAL_SPARE))
181	EX_ST(STORE_INIT(%o5, %o0))
182	add		%o0, 0x08, %o0
183	EX_ST(STORE_INIT(%g2, %o0))
184	add		%o0, 0x08, %o0
185	EX_ST(STORE_INIT(%g3, %o0))
186	add		%o0, 0x08, %o0
187	EX_ST(STORE_INIT(GLOBAL_SPARE, %o0))
188	add		%o0, 0x08, %o0
189	bne,pt		%icc, 1b
190	 LOAD(prefetch, %o1 + 0x200, #n_reads_strong)
191
192	membar		#StoreLoad | #StoreStore
193
194	brz,pn		%o2, .Lexit
195	 cmp		%o2, 19
196	ble,pn		%icc, .Lsmall_unaligned
197	 nop
198	ba,a,pt		%icc, .Lmedium_noprefetch
199
200.Lexit:	retl
201	 mov		EX_RETVAL(%o3), %o0
202
203.Llarge_src_unaligned:
204#ifdef NON_USER_COPY
205	VISEntryHalfFast(.Lmedium_vis_entry_fail)
206#else
207	VISEntryHalf
208#endif
209	andn		%o2, 0x3f, %o4
210	sub		%o2, %o4, %o2
211	alignaddr	%o1, %g0, %g1
212	add		%o1, %o4, %o1
213	EX_LD(LOAD(ldd, %g1 + 0x00, %f0))
2141:	EX_LD(LOAD(ldd, %g1 + 0x08, %f2))
215	subcc		%o4, 0x40, %o4
216	EX_LD(LOAD(ldd, %g1 + 0x10, %f4))
217	EX_LD(LOAD(ldd, %g1 + 0x18, %f6))
218	EX_LD(LOAD(ldd, %g1 + 0x20, %f8))
219	EX_LD(LOAD(ldd, %g1 + 0x28, %f10))
220	EX_LD(LOAD(ldd, %g1 + 0x30, %f12))
221	EX_LD(LOAD(ldd, %g1 + 0x38, %f14))
222	faligndata	%f0, %f2, %f16
223	EX_LD(LOAD(ldd, %g1 + 0x40, %f0))
224	faligndata	%f2, %f4, %f18
225	add		%g1, 0x40, %g1
226	faligndata	%f4, %f6, %f20
227	faligndata	%f6, %f8, %f22
228	faligndata	%f8, %f10, %f24
229	faligndata	%f10, %f12, %f26
230	faligndata	%f12, %f14, %f28
231	faligndata	%f14, %f0, %f30
232	EX_ST(STORE(std, %f16, %o0 + 0x00))
233	EX_ST(STORE(std, %f18, %o0 + 0x08))
234	EX_ST(STORE(std, %f20, %o0 + 0x10))
235	EX_ST(STORE(std, %f22, %o0 + 0x18))
236	EX_ST(STORE(std, %f24, %o0 + 0x20))
237	EX_ST(STORE(std, %f26, %o0 + 0x28))
238	EX_ST(STORE(std, %f28, %o0 + 0x30))
239	EX_ST(STORE(std, %f30, %o0 + 0x38))
240	add		%o0, 0x40, %o0
241	bne,pt		%icc, 1b
242	 LOAD(prefetch, %g1 + 0x200, #n_reads_strong)
243#ifdef NON_USER_COPY
244	VISExitHalfFast
245#else
246	VISExitHalf
247#endif
248	brz,pn		%o2, .Lexit
249	 cmp		%o2, 19
250	ble,pn		%icc, .Lsmall_unaligned
251	 nop
252	ba,a,pt		%icc, .Lmedium_unaligned
253
254#ifdef NON_USER_COPY
255.Lmedium_vis_entry_fail:
256	 or		%o0, %o1, %g2
257#endif
258.Lmedium:
259	LOAD(prefetch, %o1 + 0x40, #n_reads_strong)
260	andcc		%g2, 0x7, %g0
261	bne,pn		%icc, .Lmedium_unaligned
262	 nop
263.Lmedium_noprefetch:
264	andncc		%o2, 0x20 - 1, %o5
265	be,pn		%icc, 2f
266	 sub		%o2, %o5, %o2
2671:	EX_LD(LOAD(ldx, %o1 + 0x00, %g1))
268	EX_LD(LOAD(ldx, %o1 + 0x08, %g2))
269	EX_LD(LOAD(ldx, %o1 + 0x10, GLOBAL_SPARE))
270	EX_LD(LOAD(ldx, %o1 + 0x18, %o4))
271	add		%o1, 0x20, %o1
272	subcc		%o5, 0x20, %o5
273	EX_ST(STORE(stx, %g1, %o0 + 0x00))
274	EX_ST(STORE(stx, %g2, %o0 + 0x08))
275	EX_ST(STORE(stx, GLOBAL_SPARE, %o0 + 0x10))
276	EX_ST(STORE(stx, %o4, %o0 + 0x18))
277	bne,pt		%icc, 1b
278	 add		%o0, 0x20, %o0
2792:	andcc		%o2, 0x18, %o5
280	be,pt		%icc, 3f
281	 sub		%o2, %o5, %o2
2821:	EX_LD(LOAD(ldx, %o1 + 0x00, %g1))
283	add		%o1, 0x08, %o1
284	add		%o0, 0x08, %o0
285	subcc		%o5, 0x08, %o5
286	bne,pt		%icc, 1b
287	 EX_ST(STORE(stx, %g1, %o0 - 0x08))
2883:	brz,pt		%o2, .Lexit
289	 cmp		%o2, 0x04
290	bl,pn		%icc, .Ltiny
291	 nop
292	EX_LD(LOAD(lduw, %o1 + 0x00, %g1))
293	add		%o1, 0x04, %o1
294	add		%o0, 0x04, %o0
295	subcc		%o2, 0x04, %o2
296	bne,pn		%icc, .Ltiny
297	 EX_ST(STORE(stw, %g1, %o0 - 0x04))
298	ba,a,pt		%icc, .Lexit
299.Lmedium_unaligned:
300	/* First get dest 8 byte aligned.  */
301	sub		%g0, %o0, %g1
302	and		%g1, 0x7, %g1
303	brz,pt		%g1, 2f
304	 sub		%o2, %g1, %o2
305
3061:	EX_LD(LOAD(ldub, %o1 + 0x00, %g2))
307	add		%o1, 1, %o1
308	subcc		%g1, 1, %g1
309	add		%o0, 1, %o0
310	bne,pt		%icc, 1b
311	 EX_ST(STORE(stb, %g2, %o0 - 0x01))
3122:
313	and		%o1, 0x7, %g1
314	brz,pn		%g1, .Lmedium_noprefetch
315	 sll		%g1, 3, %g1
316	mov		64, %g2
317	sub		%g2, %g1, %g2
318	andn		%o1, 0x7, %o1
319	EX_LD(LOAD(ldx, %o1 + 0x00, %o4))
320	sllx		%o4, %g1, %o4
321	andn		%o2, 0x08 - 1, %o5
322	sub		%o2, %o5, %o2
3231:	EX_LD(LOAD(ldx, %o1 + 0x08, %g3))
324	add		%o1, 0x08, %o1
325	subcc		%o5, 0x08, %o5
326	srlx		%g3, %g2, GLOBAL_SPARE
327	or		GLOBAL_SPARE, %o4, GLOBAL_SPARE
328	EX_ST(STORE(stx, GLOBAL_SPARE, %o0 + 0x00))
329	add		%o0, 0x08, %o0
330	bne,pt		%icc, 1b
331	 sllx		%g3, %g1, %o4
332	srl		%g1, 3, %g1
333	add		%o1, %g1, %o1
334	brz,pn		%o2, .Lexit
335	 nop
336	ba,pt		%icc, .Lsmall_unaligned
337
338.Ltiny:
339	EX_LD(LOAD(ldub, %o1 + 0x00, %g1))
340	subcc		%o2, 1, %o2
341	be,pn		%icc, .Lexit
342	 EX_ST(STORE(stb, %g1, %o0 + 0x00))
343	EX_LD(LOAD(ldub, %o1 + 0x01, %g1))
344	subcc		%o2, 1, %o2
345	be,pn		%icc, .Lexit
346	 EX_ST(STORE(stb, %g1, %o0 + 0x01))
347	EX_LD(LOAD(ldub, %o1 + 0x02, %g1))
348	ba,pt		%icc, .Lexit
349	 EX_ST(STORE(stb, %g1, %o0 + 0x02))
350
351.Lsmall:
352	andcc		%g2, 0x3, %g0
353	bne,pn		%icc, .Lsmall_unaligned
354	 andn		%o2, 0x4 - 1, %o5
355	sub		%o2, %o5, %o2
3561:
357	EX_LD(LOAD(lduw, %o1 + 0x00, %g1))
358	add		%o1, 0x04, %o1
359	subcc		%o5, 0x04, %o5
360	add		%o0, 0x04, %o0
361	bne,pt		%icc, 1b
362	 EX_ST(STORE(stw, %g1, %o0 - 0x04))
363	brz,pt		%o2, .Lexit
364	 nop
365	ba,a,pt		%icc, .Ltiny
366
367.Lsmall_unaligned:
3681:	EX_LD(LOAD(ldub, %o1 + 0x00, %g1))
369	add		%o1, 1, %o1
370	add		%o0, 1, %o0
371	subcc		%o2, 1, %o2
372	bne,pt		%icc, 1b
373	 EX_ST(STORE(stb, %g1, %o0 - 0x01))
374	ba,a,pt		%icc, .Lexit
375	.size		FUNC_NAME, .-FUNC_NAME
376