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1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2003, 04, 07 Ralf Baechle <ralf@linux-mips.org>
7 * Copyright (C) MIPS Technologies, Inc.
8 * written by Ralf Baechle <ralf@linux-mips.org>
9 */
10#ifndef _ASM_HAZARDS_H
11#define _ASM_HAZARDS_H
12
13#include <linux/stringify.h>
14
15#define ___ssnop \
16 sll $0, $0, 1
17
18#define ___ehb \
19 sll $0, $0, 3
20
21/*
22 * TLB hazards
23 */
24#if defined(CONFIG_CPU_MIPSR2) && !defined(CONFIG_CPU_CAVIUM_OCTEON)
25
26/*
27 * MIPSR2 defines ehb for hazard avoidance
28 */
29
30#define __mtc0_tlbw_hazard \
31 ___ehb
32
33#define __tlbw_use_hazard \
34 ___ehb
35
36#define __tlb_probe_hazard \
37 ___ehb
38
39#define __irq_enable_hazard \
40 ___ehb
41
42#define __irq_disable_hazard \
43 ___ehb
44
45#define __back_to_back_c0_hazard \
46 ___ehb
47
48/*
49 * gcc has a tradition of misscompiling the previous construct using the
50 * address of a label as argument to inline assembler. Gas otoh has the
51 * annoying difference between la and dla which are only usable for 32-bit
52 * rsp. 64-bit code, so can't be used without conditional compilation.
53 * The alterantive is switching the assembler to 64-bit code which happens
54 * to work right even for 32-bit code ...
55 */
56#define instruction_hazard() \
57do { \
58 unsigned long tmp; \
59 \
60 __asm__ __volatile__( \
61 " .set mips64r2 \n" \
62 " dla %0, 1f \n" \
63 " jr.hb %0 \n" \
64 " .set mips0 \n" \
65 "1: \n" \
66 : "=r" (tmp)); \
67} while (0)
68
69#elif (defined(CONFIG_CPU_MIPSR1) && !defined(CONFIG_MIPS_ALCHEMY)) || \
70 defined(CONFIG_CPU_BMIPS)
71
72/*
73 * These are slightly complicated by the fact that we guarantee R1 kernels to
74 * run fine on R2 processors.
75 */
76
77#define __mtc0_tlbw_hazard \
78 ___ssnop; \
79 ___ssnop; \
80 ___ehb
81
82#define __tlbw_use_hazard \
83 ___ssnop; \
84 ___ssnop; \
85 ___ssnop; \
86 ___ehb
87
88#define __tlb_probe_hazard \
89 ___ssnop; \
90 ___ssnop; \
91 ___ssnop; \
92 ___ehb
93
94#define __irq_enable_hazard \
95 ___ssnop; \
96 ___ssnop; \
97 ___ssnop; \
98 ___ehb
99
100#define __irq_disable_hazard \
101 ___ssnop; \
102 ___ssnop; \
103 ___ssnop; \
104 ___ehb
105
106#define __back_to_back_c0_hazard \
107 ___ssnop; \
108 ___ssnop; \
109 ___ssnop; \
110 ___ehb
111
112/*
113 * gcc has a tradition of misscompiling the previous construct using the
114 * address of a label as argument to inline assembler. Gas otoh has the
115 * annoying difference between la and dla which are only usable for 32-bit
116 * rsp. 64-bit code, so can't be used without conditional compilation.
117 * The alterantive is switching the assembler to 64-bit code which happens
118 * to work right even for 32-bit code ...
119 */
120#define __instruction_hazard() \
121do { \
122 unsigned long tmp; \
123 \
124 __asm__ __volatile__( \
125 " .set mips64r2 \n" \
126 " dla %0, 1f \n" \
127 " jr.hb %0 \n" \
128 " .set mips0 \n" \
129 "1: \n" \
130 : "=r" (tmp)); \
131} while (0)
132
133#define instruction_hazard() \
134do { \
135 if (cpu_has_mips_r2) \
136 __instruction_hazard(); \
137} while (0)
138
139#elif defined(CONFIG_MIPS_ALCHEMY) || defined(CONFIG_CPU_CAVIUM_OCTEON) || \
140 defined(CONFIG_CPU_LOONGSON2) || defined(CONFIG_CPU_R10000) || \
141 defined(CONFIG_CPU_R5500) || defined(CONFIG_CPU_XLR)
142
143/*
144 * R10000 rocks - all hazards handled in hardware, so this becomes a nobrainer.
145 */
146
147#define __mtc0_tlbw_hazard
148
149#define __tlbw_use_hazard
150
151#define __tlb_probe_hazard
152
153#define __irq_enable_hazard
154
155#define __irq_disable_hazard
156
157#define __back_to_back_c0_hazard
158
159#define instruction_hazard() do { } while (0)
160
161#elif defined(CONFIG_CPU_SB1)
162
163/*
164 * Mostly like R4000 for historic reasons
165 */
166#define __mtc0_tlbw_hazard
167
168#define __tlbw_use_hazard
169
170#define __tlb_probe_hazard
171
172#define __irq_enable_hazard
173
174#define __irq_disable_hazard \
175 ___ssnop; \
176 ___ssnop; \
177 ___ssnop
178
179#define __back_to_back_c0_hazard
180
181#define instruction_hazard() do { } while (0)
182
183#else
184
185/*
186 * Finally the catchall case for all other processors including R4000, R4400,
187 * R4600, R4700, R5000, RM7000, NEC VR41xx etc.
188 *
189 * The taken branch will result in a two cycle penalty for the two killed
190 * instructions on R4000 / R4400. Other processors only have a single cycle
191 * hazard so this is nice trick to have an optimal code for a range of
192 * processors.
193 */
194#define __mtc0_tlbw_hazard \
195 nop; \
196 nop
197
198#define __tlbw_use_hazard \
199 nop; \
200 nop; \
201 nop
202
203#define __tlb_probe_hazard \
204 nop; \
205 nop; \
206 nop
207
208#define __irq_enable_hazard \
209 ___ssnop; \
210 ___ssnop; \
211 ___ssnop
212
213#define __irq_disable_hazard \
214 nop; \
215 nop; \
216 nop
217
218#define __back_to_back_c0_hazard \
219 ___ssnop; \
220 ___ssnop; \
221 ___ssnop
222
223#define instruction_hazard() do { } while (0)
224
225#endif
226
227
228/* FPU hazards */
229
230#if defined(CONFIG_CPU_SB1)
231
232#define __enable_fpu_hazard \
233 .set push; \
234 .set mips64; \
235 .set noreorder; \
236 ___ssnop; \
237 bnezl $0, .+4; \
238 ___ssnop; \
239 .set pop
240
241#define __disable_fpu_hazard
242
243#elif defined(CONFIG_CPU_MIPSR2)
244
245#define __enable_fpu_hazard \
246 ___ehb
247
248#define __disable_fpu_hazard \
249 ___ehb
250
251#else
252
253#define __enable_fpu_hazard \
254 nop; \
255 nop; \
256 nop; \
257 nop
258
259#define __disable_fpu_hazard \
260 ___ehb
261
262#endif
263
264#ifdef __ASSEMBLY__
265
266#define _ssnop ___ssnop
267#define _ehb ___ehb
268#define mtc0_tlbw_hazard __mtc0_tlbw_hazard
269#define tlbw_use_hazard __tlbw_use_hazard
270#define tlb_probe_hazard __tlb_probe_hazard
271#define irq_enable_hazard __irq_enable_hazard
272#define irq_disable_hazard __irq_disable_hazard
273#define back_to_back_c0_hazard __back_to_back_c0_hazard
274#define enable_fpu_hazard __enable_fpu_hazard
275#define disable_fpu_hazard __disable_fpu_hazard
276
277#else
278
279#define _ssnop() \
280do { \
281 __asm__ __volatile__( \
282 __stringify(___ssnop) \
283 ); \
284} while (0)
285
286#define _ehb() \
287do { \
288 __asm__ __volatile__( \
289 __stringify(___ehb) \
290 ); \
291} while (0)
292
293
294#define mtc0_tlbw_hazard() \
295do { \
296 __asm__ __volatile__( \
297 __stringify(__mtc0_tlbw_hazard) \
298 ); \
299} while (0)
300
301
302#define tlbw_use_hazard() \
303do { \
304 __asm__ __volatile__( \
305 __stringify(__tlbw_use_hazard) \
306 ); \
307} while (0)
308
309
310#define tlb_probe_hazard() \
311do { \
312 __asm__ __volatile__( \
313 __stringify(__tlb_probe_hazard) \
314 ); \
315} while (0)
316
317
318#define irq_enable_hazard() \
319do { \
320 __asm__ __volatile__( \
321 __stringify(__irq_enable_hazard) \
322 ); \
323} while (0)
324
325
326#define irq_disable_hazard() \
327do { \
328 __asm__ __volatile__( \
329 __stringify(__irq_disable_hazard) \
330 ); \
331} while (0)
332
333
334#define back_to_back_c0_hazard() \
335do { \
336 __asm__ __volatile__( \
337 __stringify(__back_to_back_c0_hazard) \
338 ); \
339} while (0)
340
341
342#define enable_fpu_hazard() \
343do { \
344 __asm__ __volatile__( \
345 __stringify(__enable_fpu_hazard) \
346 ); \
347} while (0)
348
349
350#define disable_fpu_hazard() \
351do { \
352 __asm__ __volatile__( \
353 __stringify(__disable_fpu_hazard) \
354 ); \
355} while (0)
356
357/*
358 * MIPS R2 instruction hazard barrier. Needs to be called as a subroutine.
359 */
360extern void mips_ihb(void);
361
362#endif /* __ASSEMBLY__ */
363
364#endif /* _ASM_HAZARDS_H */
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2003, 04, 07 Ralf Baechle <ralf@linux-mips.org>
7 * Copyright (C) MIPS Technologies, Inc.
8 * written by Ralf Baechle <ralf@linux-mips.org>
9 */
10#ifndef _ASM_HAZARDS_H
11#define _ASM_HAZARDS_H
12
13#include <linux/stringify.h>
14#include <asm/compiler.h>
15
16#define ___ssnop \
17 sll $0, $0, 1
18
19#define ___ehb \
20 sll $0, $0, 3
21
22/*
23 * TLB hazards
24 */
25#if (defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6)) && \
26 !defined(CONFIG_CPU_CAVIUM_OCTEON) && !defined(CONFIG_LOONGSON3_ENHANCEMENT)
27
28/*
29 * MIPSR2 defines ehb for hazard avoidance
30 */
31
32#define __mtc0_tlbw_hazard \
33 ___ehb
34
35#define __mtc0_tlbr_hazard \
36 ___ehb
37
38#define __tlbw_use_hazard \
39 ___ehb
40
41#define __tlb_read_hazard \
42 ___ehb
43
44#define __tlb_probe_hazard \
45 ___ehb
46
47#define __irq_enable_hazard \
48 ___ehb
49
50#define __irq_disable_hazard \
51 ___ehb
52
53#define __back_to_back_c0_hazard \
54 ___ehb
55
56/*
57 * gcc has a tradition of misscompiling the previous construct using the
58 * address of a label as argument to inline assembler. Gas otoh has the
59 * annoying difference between la and dla which are only usable for 32-bit
60 * rsp. 64-bit code, so can't be used without conditional compilation.
61 * The alternative is switching the assembler to 64-bit code which happens
62 * to work right even for 32-bit code...
63 */
64#define instruction_hazard() \
65do { \
66 unsigned long tmp; \
67 \
68 __asm__ __volatile__( \
69 " .set "MIPS_ISA_LEVEL" \n" \
70 " dla %0, 1f \n" \
71 " jr.hb %0 \n" \
72 " .set mips0 \n" \
73 "1: \n" \
74 : "=r" (tmp)); \
75} while (0)
76
77#elif (defined(CONFIG_CPU_MIPSR1) && !defined(CONFIG_MIPS_ALCHEMY)) || \
78 defined(CONFIG_CPU_BMIPS)
79
80/*
81 * These are slightly complicated by the fact that we guarantee R1 kernels to
82 * run fine on R2 processors.
83 */
84
85#define __mtc0_tlbw_hazard \
86 ___ssnop; \
87 ___ssnop; \
88 ___ehb
89
90#define __mtc0_tlbr_hazard \
91 ___ssnop; \
92 ___ssnop; \
93 ___ehb
94
95#define __tlbw_use_hazard \
96 ___ssnop; \
97 ___ssnop; \
98 ___ssnop; \
99 ___ehb
100
101#define __tlb_read_hazard \
102 ___ssnop; \
103 ___ssnop; \
104 ___ssnop; \
105 ___ehb
106
107#define __tlb_probe_hazard \
108 ___ssnop; \
109 ___ssnop; \
110 ___ssnop; \
111 ___ehb
112
113#define __irq_enable_hazard \
114 ___ssnop; \
115 ___ssnop; \
116 ___ssnop; \
117 ___ehb
118
119#define __irq_disable_hazard \
120 ___ssnop; \
121 ___ssnop; \
122 ___ssnop; \
123 ___ehb
124
125#define __back_to_back_c0_hazard \
126 ___ssnop; \
127 ___ssnop; \
128 ___ssnop; \
129 ___ehb
130
131/*
132 * gcc has a tradition of misscompiling the previous construct using the
133 * address of a label as argument to inline assembler. Gas otoh has the
134 * annoying difference between la and dla which are only usable for 32-bit
135 * rsp. 64-bit code, so can't be used without conditional compilation.
136 * The alternative is switching the assembler to 64-bit code which happens
137 * to work right even for 32-bit code...
138 */
139#define __instruction_hazard() \
140do { \
141 unsigned long tmp; \
142 \
143 __asm__ __volatile__( \
144 " .set mips64r2 \n" \
145 " dla %0, 1f \n" \
146 " jr.hb %0 \n" \
147 " .set mips0 \n" \
148 "1: \n" \
149 : "=r" (tmp)); \
150} while (0)
151
152#define instruction_hazard() \
153do { \
154 if (cpu_has_mips_r2_r6) \
155 __instruction_hazard(); \
156} while (0)
157
158#elif defined(CONFIG_MIPS_ALCHEMY) || defined(CONFIG_CPU_CAVIUM_OCTEON) || \
159 defined(CONFIG_CPU_LOONGSON2) || defined(CONFIG_LOONGSON3_ENHANCEMENT) || \
160 defined(CONFIG_CPU_R10000) || defined(CONFIG_CPU_R5500) || defined(CONFIG_CPU_XLR)
161
162/*
163 * R10000 rocks - all hazards handled in hardware, so this becomes a nobrainer.
164 */
165
166#define __mtc0_tlbw_hazard
167
168#define __mtc0_tlbr_hazard
169
170#define __tlbw_use_hazard
171
172#define __tlb_read_hazard
173
174#define __tlb_probe_hazard
175
176#define __irq_enable_hazard
177
178#define __irq_disable_hazard
179
180#define __back_to_back_c0_hazard
181
182#define instruction_hazard() do { } while (0)
183
184#elif defined(CONFIG_CPU_SB1)
185
186/*
187 * Mostly like R4000 for historic reasons
188 */
189#define __mtc0_tlbw_hazard
190
191#define __mtc0_tlbr_hazard
192
193#define __tlbw_use_hazard
194
195#define __tlb_read_hazard
196
197#define __tlb_probe_hazard
198
199#define __irq_enable_hazard
200
201#define __irq_disable_hazard \
202 ___ssnop; \
203 ___ssnop; \
204 ___ssnop
205
206#define __back_to_back_c0_hazard
207
208#define instruction_hazard() do { } while (0)
209
210#else
211
212/*
213 * Finally the catchall case for all other processors including R4000, R4400,
214 * R4600, R4700, R5000, RM7000, NEC VR41xx etc.
215 *
216 * The taken branch will result in a two cycle penalty for the two killed
217 * instructions on R4000 / R4400. Other processors only have a single cycle
218 * hazard so this is nice trick to have an optimal code for a range of
219 * processors.
220 */
221#define __mtc0_tlbw_hazard \
222 nop; \
223 nop
224
225#define __mtc0_tlbr_hazard \
226 nop; \
227 nop
228
229#define __tlbw_use_hazard \
230 nop; \
231 nop; \
232 nop
233
234#define __tlb_read_hazard \
235 nop; \
236 nop; \
237 nop
238
239#define __tlb_probe_hazard \
240 nop; \
241 nop; \
242 nop
243
244#define __irq_enable_hazard \
245 ___ssnop; \
246 ___ssnop; \
247 ___ssnop
248
249#define __irq_disable_hazard \
250 nop; \
251 nop; \
252 nop
253
254#define __back_to_back_c0_hazard \
255 ___ssnop; \
256 ___ssnop; \
257 ___ssnop
258
259#define instruction_hazard() do { } while (0)
260
261#endif
262
263
264/* FPU hazards */
265
266#if defined(CONFIG_CPU_SB1)
267
268#define __enable_fpu_hazard \
269 .set push; \
270 .set mips64; \
271 .set noreorder; \
272 ___ssnop; \
273 bnezl $0, .+4; \
274 ___ssnop; \
275 .set pop
276
277#define __disable_fpu_hazard
278
279#elif defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6)
280
281#define __enable_fpu_hazard \
282 ___ehb
283
284#define __disable_fpu_hazard \
285 ___ehb
286
287#else
288
289#define __enable_fpu_hazard \
290 nop; \
291 nop; \
292 nop; \
293 nop
294
295#define __disable_fpu_hazard \
296 ___ehb
297
298#endif
299
300#ifdef __ASSEMBLY__
301
302#define _ssnop ___ssnop
303#define _ehb ___ehb
304#define mtc0_tlbw_hazard __mtc0_tlbw_hazard
305#define mtc0_tlbr_hazard __mtc0_tlbr_hazard
306#define tlbw_use_hazard __tlbw_use_hazard
307#define tlb_read_hazard __tlb_read_hazard
308#define tlb_probe_hazard __tlb_probe_hazard
309#define irq_enable_hazard __irq_enable_hazard
310#define irq_disable_hazard __irq_disable_hazard
311#define back_to_back_c0_hazard __back_to_back_c0_hazard
312#define enable_fpu_hazard __enable_fpu_hazard
313#define disable_fpu_hazard __disable_fpu_hazard
314
315#else
316
317#define _ssnop() \
318do { \
319 __asm__ __volatile__( \
320 __stringify(___ssnop) \
321 ); \
322} while (0)
323
324#define _ehb() \
325do { \
326 __asm__ __volatile__( \
327 __stringify(___ehb) \
328 ); \
329} while (0)
330
331
332#define mtc0_tlbw_hazard() \
333do { \
334 __asm__ __volatile__( \
335 __stringify(__mtc0_tlbw_hazard) \
336 ); \
337} while (0)
338
339
340#define mtc0_tlbr_hazard() \
341do { \
342 __asm__ __volatile__( \
343 __stringify(__mtc0_tlbr_hazard) \
344 ); \
345} while (0)
346
347
348#define tlbw_use_hazard() \
349do { \
350 __asm__ __volatile__( \
351 __stringify(__tlbw_use_hazard) \
352 ); \
353} while (0)
354
355
356#define tlb_read_hazard() \
357do { \
358 __asm__ __volatile__( \
359 __stringify(__tlb_read_hazard) \
360 ); \
361} while (0)
362
363
364#define tlb_probe_hazard() \
365do { \
366 __asm__ __volatile__( \
367 __stringify(__tlb_probe_hazard) \
368 ); \
369} while (0)
370
371
372#define irq_enable_hazard() \
373do { \
374 __asm__ __volatile__( \
375 __stringify(__irq_enable_hazard) \
376 ); \
377} while (0)
378
379
380#define irq_disable_hazard() \
381do { \
382 __asm__ __volatile__( \
383 __stringify(__irq_disable_hazard) \
384 ); \
385} while (0)
386
387
388#define back_to_back_c0_hazard() \
389do { \
390 __asm__ __volatile__( \
391 __stringify(__back_to_back_c0_hazard) \
392 ); \
393} while (0)
394
395
396#define enable_fpu_hazard() \
397do { \
398 __asm__ __volatile__( \
399 __stringify(__enable_fpu_hazard) \
400 ); \
401} while (0)
402
403
404#define disable_fpu_hazard() \
405do { \
406 __asm__ __volatile__( \
407 __stringify(__disable_fpu_hazard) \
408 ); \
409} while (0)
410
411/*
412 * MIPS R2 instruction hazard barrier. Needs to be called as a subroutine.
413 */
414extern void mips_ihb(void);
415
416#endif /* __ASSEMBLY__ */
417
418#endif /* _ASM_HAZARDS_H */