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
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
|
/* $NetBSD: bzero.S,v 1.7 2003/07/26 19:24:37 salo Exp $ */
/*-
* Copyright (C) 2001 Martin J. Laubach <mjl@NetBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*----------------------------------------------------------------------*/
#include <machine/asm.h>
#ifdef _KERNEL
#include <assym.h>
#endif
#define USE_STSWX 0 /* don't. slower than trivial copy loop */
/*----------------------------------------------------------------------*/
/*
void bzero(void *b %r3, size_t len %r4);
void * memset(void *b %r3, int c %r4, size_t len %r5);
*/
/*----------------------------------------------------------------------*/
#define r_dst %r3
#define r_len %r4
#define r_val %r0
.text
.align 4
ENTRY(bzero)
li r_val, 0 /* Value to stuff in */
b cb_memset
ENTRY(memset)
cmplwi cr1, %r5, 0
mr. %r0, %r4
mr %r8, %r3
beqlr- cr1 /* Nothing to do */
rlwimi %r0, %r4, 8, 16, 23 /* word extend fill value */
rlwimi %r0, %r0, 16, 0, 15
mr %r4, %r5
bne- simple_fill /* =! 0, use trivial fill */
cb_memset:
/*----------------------------------------------------------------------*/
#ifndef _KERNEL
/* First find out cache line size */
#ifdef PIC
mflr %r9
bl _GLOBAL_OFFSET_TABLE_@local-4
mflr %r10
mtlr %r9
lwz %r5,cache_info@got(%r10)
#else
lis %r5,cache_info@h
ori %r5,%r5,cache_info@l
#endif
lwz %r6, 4(%r5)
cmpwi %r6, -1
bne+ cb_cacheline_known
/*----------------------------------------------------------------------*/
#define CTL_MACHDEP 7
#define CPU_CACHELINE 1
#define CPU_CACHEINFO 5
#define STKFRAME_SZ 48
#define MIB 8
#define OLDPLEN 16
#define R3_SAVE 20
#define R4_SAVE 24
#define R0_SAVE 28
#define R8_SAVE 32
mflr %r6
stw %r6, 4(%r1)
stwu %r1, -STKFRAME_SZ(%r1)
stw %r8, R8_SAVE(%r1)
stw %r3, R3_SAVE(%r1)
stw %r4, R4_SAVE(%r1)
stw %r0, R0_SAVE(%r1)
li %r0, CTL_MACHDEP /* Construct MIB */
stw %r0, MIB(%r1)
li %r0, CPU_CACHEINFO
stw %r0, MIB+4(%r1)
li %r0, 4*4 /* Oldlenp := 4*4 */
stw %r0, OLDPLEN(%r1)
addi %r3, %r1, MIB
li %r4, 2 /* namelen */
/* %r5 already contains &cache_info */
addi %r6, %r1, OLDPLEN
li %r7, 0
li %r8, 0
bl PIC_PLT(_C_LABEL(sysctl))
cmpwi %r3, 0 /* Check result */
beq 1f
/* Failure, try older sysctl */
li %r0, CTL_MACHDEP /* Construct MIB */
stw %r0, MIB(%r1)
li %r0, CPU_CACHELINE
stw %r0, MIB+4(%r1)
li %r0, 4 /* Oldlenp := 4 */
stw %r0, OLDPLEN(%r1)
addi %r3, %r1, MIB
li %r4, 2 /* namelen */
#ifdef PIC
mflr %r9
bl _GLOBAL_OFFSET_TABLE_@local-4
mflr %r10
mtlr %r9
lwz %r5,cache_info@got(%r10)
addi %r5, %r5, 4
#else
lis %r5,cache_info+4@h
ori %r5,%r5,cache_info+4@l
#endif
addi %r6, %r1, OLDPLEN
li %r7, 0
li %r8, 0
bl PIC_PLT(_C_LABEL(sysctl))
1:
lwz %r8, R8_SAVE(%r1)
lwz %r3, R3_SAVE(%r1)
lwz %r4, R4_SAVE(%r1)
lwz %r0, R0_SAVE(%r1)
#ifdef PIC
bl _GLOBAL_OFFSET_TABLE_@local-4
mflr %r10
lwz %r9, cache_info@got(%r10)
lwz %r9, 4(%r9)
#else
lis %r5, cache_info+4@ha
lwz %r9, cache_info+4@l(%r5)
#endif
la %r1, STKFRAME_SZ(%r1)
lwz %r5, 4(%r1)
mtlr %r5
cntlzw %r6, %r9 /* compute shift value */
li %r5, 31
subf %r5, %r6, %r5
#ifdef PIC
lwz %r6, cache_sh@got(%r10)
stw %r5, 0(%r6)
#else
lis %r6, cache_sh@ha
stw %r5, cache_sh@l(%r6)
#endif
/*----------------------------------------------------------------------*/
/* Okay, we know the cache line size (%r9) and shift value (%r10) */
cb_cacheline_known:
#ifdef PIC
lwz %r5, cache_info@got(%r10)
lwz %r9, 4(%r5)
lwz %r5, cache_sh@got(%r10)
lwz %r10, 0(%r5)
#else
lis %r9, cache_info+4@ha
lwz %r9, cache_info+4@l(%r9)
lis %r10, cache_sh@ha
lwz %r10, cache_sh@l(%r10)
#endif
#else /* _KERNEL */
#ifdef MULTIPROCESSOR
mfsprg %r10, 0 /* Get cpu_info pointer */
#else
lis %r10, cpu_info_store@ha
addi %r10, %r10, cpu_info_store@l
#endif
lwz %r9, CPU_CI+4(%r10) /* Load D$ line size */
cntlzw %r10, %r9 /* Calculate shift.. */
li %r6, 31
subf %r10, %r10, %r6
#endif /* _KERNEL */
/* Back in memory filling business */
cmplwi cr1, r_len, 0 /* Nothing to do? */
add %r5, %r9, %r9
cmplw r_len, %r5 /* <= 2*CL bytes to move? */
beqlr- cr1 /* then do nothing */
blt+ simple_fill /* a trivial fill routine */
/* Word align the block, fill bytewise until dst even*/
andi. %r5, r_dst, 0x03
li %r6, 4
beq+ cb_aligned_w /* already aligned to word? */
subf %r5, %r5, %r6 /* bytes to fill to align4 */
#if USE_STSWX
mtxer %r5
stswx %r0, 0, r_dst
add r_dst, %r5, r_dst
#else
mtctr %r5
subi r_dst, r_dst, 1
1: stbu r_val, 1(r_dst) /* Fill bytewise */
bdnz 1b
addi r_dst, r_dst, 1
#endif
subf r_len, %r5, r_len
cb_aligned_w: /* Cache block align, fill wordwise until dst aligned */
/* I know I have something to do since we had > 2*CL initially */
/* so no need to check for r_len = 0 */
subi %r6, %r9, 1 /* CL mask */
and. %r5, r_dst, %r6
srwi %r5, %r5, 2
srwi %r6, %r9, 2
beq cb_aligned_cb /* already on CL boundary? */
subf %r5, %r5, %r6 /* words to fill to alignment */
mtctr %r5
slwi %r5, %r5, 2
subf r_len, %r5, r_len
subi r_dst, r_dst, 4
1: stwu r_val, 4(r_dst) /* Fill wordwise */
bdnz 1b
addi r_dst, r_dst, 4
cb_aligned_cb: /* no need to check r_len, see above */
srw. %r5, r_len, %r10 /* Number of cache blocks */
mtctr %r5
beq cblocks_done
slw %r5, %r5, %r10
subf r_len, %r5, r_len
1: dcbz 0, r_dst /* Clear blockwise */
add r_dst, r_dst, %r9
bdnz 1b
cblocks_done: /* still CL aligned, but less than CL bytes left */
cmplwi cr1, r_len, 0
cmplwi r_len, 8
beq- cr1, sf_return
blt- sf_bytewise /* <8 remaining? */
b sf_aligned_w
/*----------------------------------------------------------------------*/
wbzero: li r_val, 0
cmplwi r_len, 0
beqlr- /* Nothing to do */
simple_fill:
#if USE_STSWX
cmplwi cr1, r_len, 12 /* < 12 bytes to move? */
#else
cmplwi cr1, r_len, 8 /* < 8 bytes to move? */
#endif
andi. %r5, r_dst, 0x03 /* bytes to fill to align4 */
blt cr1, sf_bytewise /* trivial byte mover */
li %r6, 4
subf %r5, %r5, %r6
beq+ sf_aligned_w /* dest is word aligned */
#if USE_STSWX
mtxer %r5
stswx %r0, 0, r_dst
add r_dst, %r5, r_dst
#else
mtctr %r5 /* nope, then fill bytewise */
subi r_dst, r_dst, 1 /* until it is */
1: stbu r_val, 1(r_dst)
bdnz 1b
addi r_dst, r_dst, 1
#endif
subf r_len, %r5, r_len
sf_aligned_w: /* no need to check r_len since it were >= 8 bytes initially */
#if USE_STSWX
mr %r6, %r0
mr %r7, %r0
srwi %r5, r_len, 3
mtctr %r5
slwi %r5, %r5, 3 /* adjust len */
subf. r_len, %r5, r_len
1: stswi %r6, r_dst, 8
addi r_dst, r_dst, 8
bdnz 1b
#else
srwi %r5, r_len, 2 /* words to fill */
mtctr %r5
slwi %r5, %r5, 2
subf. r_len, %r5, r_len /* adjust len for fill */
subi r_dst, r_dst, 4
1: stwu r_val, 4(r_dst)
bdnz 1b
addi r_dst, r_dst, 4
#endif
sf_word_done: bne- sf_bytewise
sf_return: mr %r3, %r8 /* restore orig ptr */
blr /* for memset functionality */
sf_bytewise:
#if USE_STSWX
mr %r5, %r0
mr %r6, %r0
mr %r7, %r0
mtxer r_len
stswx %r5, 0, r_dst
#else
mtctr r_len
subi r_dst, r_dst, 1
1: stbu r_val, 1(r_dst)
bdnz 1b
#endif
mr %r3, %r8 /* restore orig ptr */
blr /* for memset functionality */
/*----------------------------------------------------------------------*/
#ifndef _KERNEL
.data
cache_info: .long -1, -1, -1, -1
cache_sh: .long 0
#endif
/*----------------------------------------------------------------------*/
|