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[IA64] Wire up epoll_pwait and utimensat
[linux-2.6/mini2440.git] / include / asm-mips / system.h
blob3713d256d36958d52d6ac750315f414c3610ff77
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) 1994, 95, 96, 97, 98, 99, 2003, 06 by Ralf Baechle
7 * Copyright (C) 1996 by Paul M. Antoine
8 * Copyright (C) 1999 Silicon Graphics
9 * Kevin D. Kissell, kevink@mips.org and Carsten Langgaard, carstenl@mips.com
10 * Copyright (C) 2000 MIPS Technologies, Inc.
11 */
12 #ifndef _ASM_SYSTEM_H
13 #define _ASM_SYSTEM_H
14
15 #include <linux/types.h>
16 #include <linux/irqflags.h>
17
18 #include <asm/addrspace.h>
19 #include <asm/barrier.h>
20 #include <asm/cpu-features.h>
21 #include <asm/dsp.h>
22 #include <asm/war.h>
23
24
25 /*
26 * switch_to(n) should switch tasks to task nr n, first
27 * checking that n isn't the current task, in which case it does nothing.
28 */
29 extern asmlinkage void *resume(void *last, void *next, void *next_ti);
30
31 struct task_struct;
32
33 #ifdef CONFIG_MIPS_MT_FPAFF
34
35 /*
36 * Handle the scheduler resume end of FPU affinity management. We do this
37 * inline to try to keep the overhead down. If we have been forced to run on
38 * a "CPU" with an FPU because of a previous high level of FP computation,
39 * but did not actually use the FPU during the most recent time-slice (CU1
40 * isn't set), we undo the restriction on cpus_allowed.
41 *
42 * We're not calling set_cpus_allowed() here, because we have no need to
43 * force prompt migration - we're already switching the current CPU to a
44 * different thread.
45 */
46
47 #define switch_to(prev,next,last) \
48 do { \
49 if (cpu_has_fpu && \
50 (prev->thread.mflags & MF_FPUBOUND) && \
51 (!(KSTK_STATUS(prev) & ST0_CU1))) { \
52 prev->thread.mflags &= ~MF_FPUBOUND; \
53 prev->cpus_allowed = prev->thread.user_cpus_allowed; \
54 } \
55 if (cpu_has_dsp) \
56 __save_dsp(prev); \
57 next->thread.emulated_fp = 0; \
58 (last) = resume(prev, next, task_thread_info(next)); \
59 if (cpu_has_dsp) \
60 __restore_dsp(current); \
61 } while(0)
62
63 #else
64 #define switch_to(prev,next,last) \
65 do { \
66 if (cpu_has_dsp) \
67 __save_dsp(prev); \
68 (last) = resume(prev, next, task_thread_info(next)); \
69 if (cpu_has_dsp) \
70 __restore_dsp(current); \
71 } while(0)
72 #endif
73
74 /*
75 * On SMP systems, when the scheduler does migration-cost autodetection,
76 * it needs a way to flush as much of the CPU's caches as possible.
77 *
78 * TODO: fill this in!
79 */
80 static inline void sched_cacheflush(void)
81 {
82 }
83
84 static inline unsigned long __xchg_u32(volatile int * m, unsigned int val)
85 {
86 __u32 retval;
87
88 if (cpu_has_llsc && R10000_LLSC_WAR) {
89 unsigned long dummy;
90
91 __asm__ __volatile__(
92 " .set mips3 \n"
93 "1: ll %0, %3 # xchg_u32 \n"
94 " .set mips0 \n"
95 " move %2, %z4 \n"
96 " .set mips3 \n"
97 " sc %2, %1 \n"
98 " beqzl %2, 1b \n"
99 " .set mips0 \n"
100 : "=&r" (retval), "=m" (*m), "=&r" (dummy)
101 : "R" (*m), "Jr" (val)
102 : "memory");
103 } else if (cpu_has_llsc) {
104 unsigned long dummy;
105
106 __asm__ __volatile__(
107 " .set mips3 \n"
108 "1: ll %0, %3 # xchg_u32 \n"
109 " .set mips0 \n"
110 " move %2, %z4 \n"
111 " .set mips3 \n"
112 " sc %2, %1 \n"
113 " beqz %2, 2f \n"
114 " .subsection 2 \n"
115 "2: b 1b \n"
116 " .previous \n"
117 " .set mips0 \n"
118 : "=&r" (retval), "=m" (*m), "=&r" (dummy)
119 : "R" (*m), "Jr" (val)
120 : "memory");
121 } else {
122 unsigned long flags;
123
124 raw_local_irq_save(flags);
125 retval = *m;
126 *m = val;
127 raw_local_irq_restore(flags); /* implies memory barrier */
128 }
129
130 smp_mb();
131
132 return retval;
133 }
134
135 #ifdef CONFIG_64BIT
136 static inline __u64 __xchg_u64(volatile __u64 * m, __u64 val)
137 {
138 __u64 retval;
139
140 if (cpu_has_llsc && R10000_LLSC_WAR) {
141 unsigned long dummy;
142
143 __asm__ __volatile__(
144 " .set mips3 \n"
145 "1: lld %0, %3 # xchg_u64 \n"
146 " move %2, %z4 \n"
147 " scd %2, %1 \n"
148 " beqzl %2, 1b \n"
149 " .set mips0 \n"
150 : "=&r" (retval), "=m" (*m), "=&r" (dummy)
151 : "R" (*m), "Jr" (val)
152 : "memory");
153 } else if (cpu_has_llsc) {
154 unsigned long dummy;
155
156 __asm__ __volatile__(
157 " .set mips3 \n"
158 "1: lld %0, %3 # xchg_u64 \n"
159 " move %2, %z4 \n"
160 " scd %2, %1 \n"
161 " beqz %2, 2f \n"
162 " .subsection 2 \n"
163 "2: b 1b \n"
164 " .previous \n"
165 " .set mips0 \n"
166 : "=&r" (retval), "=m" (*m), "=&r" (dummy)
167 : "R" (*m), "Jr" (val)
168 : "memory");
169 } else {
170 unsigned long flags;
171
172 raw_local_irq_save(flags);
173 retval = *m;
174 *m = val;
175 raw_local_irq_restore(flags); /* implies memory barrier */
176 }
177
178 smp_mb();
179
180 return retval;
181 }
182 #else
183 extern __u64 __xchg_u64_unsupported_on_32bit_kernels(volatile __u64 * m, __u64 val);
184 #define __xchg_u64 __xchg_u64_unsupported_on_32bit_kernels
185 #endif
186
187 /* This function doesn't exist, so you'll get a linker error
188 if something tries to do an invalid xchg(). */
189 extern void __xchg_called_with_bad_pointer(void);
190
191 static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
192 {
193 switch (size) {
194 case 4:
195 return __xchg_u32(ptr, x);
196 case 8:
197 return __xchg_u64(ptr, x);
198 }
199 __xchg_called_with_bad_pointer();
200 return x;
201 }
202
203 #define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
204
205 #define __HAVE_ARCH_CMPXCHG 1
206
207 static inline unsigned long __cmpxchg_u32(volatile int * m, unsigned long old,
208 unsigned long new)
209 {
210 __u32 retval;
211
212 if (cpu_has_llsc && R10000_LLSC_WAR) {
213 __asm__ __volatile__(
214 " .set push \n"
215 " .set noat \n"
216 " .set mips3 \n"
217 "1: ll %0, %2 # __cmpxchg_u32 \n"
218 " bne %0, %z3, 2f \n"
219 " .set mips0 \n"
220 " move $1, %z4 \n"
221 " .set mips3 \n"
222 " sc $1, %1 \n"
223 " beqzl $1, 1b \n"
224 "2: \n"
225 " .set pop \n"
226 : "=&r" (retval), "=R" (*m)
227 : "R" (*m), "Jr" (old), "Jr" (new)
228 : "memory");
229 } else if (cpu_has_llsc) {
230 __asm__ __volatile__(
231 " .set push \n"
232 " .set noat \n"
233 " .set mips3 \n"
234 "1: ll %0, %2 # __cmpxchg_u32 \n"
235 " bne %0, %z3, 2f \n"
236 " .set mips0 \n"
237 " move $1, %z4 \n"
238 " .set mips3 \n"
239 " sc $1, %1 \n"
240 " beqz $1, 3f \n"
241 "2: \n"
242 " .subsection 2 \n"
243 "3: b 1b \n"
244 " .previous \n"
245 " .set pop \n"
246 : "=&r" (retval), "=R" (*m)
247 : "R" (*m), "Jr" (old), "Jr" (new)
248 : "memory");
249 } else {
250 unsigned long flags;
251
252 raw_local_irq_save(flags);
253 retval = *m;
254 if (retval == old)
255 *m = new;
256 raw_local_irq_restore(flags); /* implies memory barrier */
257 }
258
259 smp_mb();
260
261 return retval;
262 }
263
264 static inline unsigned long __cmpxchg_u32_local(volatile int * m,
265 unsigned long old, unsigned long new)
266 {
267 __u32 retval;
268
269 if (cpu_has_llsc && R10000_LLSC_WAR) {
270 __asm__ __volatile__(
271 " .set push \n"
272 " .set noat \n"
273 " .set mips3 \n"
274 "1: ll %0, %2 # __cmpxchg_u32 \n"
275 " bne %0, %z3, 2f \n"
276 " .set mips0 \n"
277 " move $1, %z4 \n"
278 " .set mips3 \n"
279 " sc $1, %1 \n"
280 " beqzl $1, 1b \n"
281 "2: \n"
282 " .set pop \n"
283 : "=&r" (retval), "=R" (*m)
284 : "R" (*m), "Jr" (old), "Jr" (new)
285 : "memory");
286 } else if (cpu_has_llsc) {
287 __asm__ __volatile__(
288 " .set push \n"
289 " .set noat \n"
290 " .set mips3 \n"
291 "1: ll %0, %2 # __cmpxchg_u32 \n"
292 " bne %0, %z3, 2f \n"
293 " .set mips0 \n"
294 " move $1, %z4 \n"
295 " .set mips3 \n"
296 " sc $1, %1 \n"
297 " beqz $1, 1b \n"
298 "2: \n"
299 " .set pop \n"
300 : "=&r" (retval), "=R" (*m)
301 : "R" (*m), "Jr" (old), "Jr" (new)
302 : "memory");
303 } else {
304 unsigned long flags;
305
306 local_irq_save(flags);
307 retval = *m;
308 if (retval == old)
309 *m = new;
310 local_irq_restore(flags); /* implies memory barrier */
311 }
312
313 return retval;
314 }
315
316 #ifdef CONFIG_64BIT
317 static inline unsigned long __cmpxchg_u64(volatile int * m, unsigned long old,
318 unsigned long new)
319 {
320 __u64 retval;
321
322 if (cpu_has_llsc && R10000_LLSC_WAR) {
323 __asm__ __volatile__(
324 " .set push \n"
325 " .set noat \n"
326 " .set mips3 \n"
327 "1: lld %0, %2 # __cmpxchg_u64 \n"
328 " bne %0, %z3, 2f \n"
329 " move $1, %z4 \n"
330 " scd $1, %1 \n"
331 " beqzl $1, 1b \n"
332 "2: \n"
333 " .set pop \n"
334 : "=&r" (retval), "=R" (*m)
335 : "R" (*m), "Jr" (old), "Jr" (new)
336 : "memory");
337 } else if (cpu_has_llsc) {
338 __asm__ __volatile__(
339 " .set push \n"
340 " .set noat \n"
341 " .set mips3 \n"
342 "1: lld %0, %2 # __cmpxchg_u64 \n"
343 " bne %0, %z3, 2f \n"
344 " move $1, %z4 \n"
345 " scd $1, %1 \n"
346 " beqz $1, 3f \n"
347 "2: \n"
348 " .subsection 2 \n"
349 "3: b 1b \n"
350 " .previous \n"
351 " .set pop \n"
352 : "=&r" (retval), "=R" (*m)
353 : "R" (*m), "Jr" (old), "Jr" (new)
354 : "memory");
355 } else {
356 unsigned long flags;
357
358 raw_local_irq_save(flags);
359 retval = *m;
360 if (retval == old)
361 *m = new;
362 raw_local_irq_restore(flags); /* implies memory barrier */
363 }
364
365 smp_mb();
366
367 return retval;
368 }
369
370 static inline unsigned long __cmpxchg_u64_local(volatile int * m,
371 unsigned long old, unsigned long new)
372 {
373 __u64 retval;
374
375 if (cpu_has_llsc && R10000_LLSC_WAR) {
376 __asm__ __volatile__(
377 " .set push \n"
378 " .set noat \n"
379 " .set mips3 \n"
380 "1: lld %0, %2 # __cmpxchg_u64 \n"
381 " bne %0, %z3, 2f \n"
382 " move $1, %z4 \n"
383 " scd $1, %1 \n"
384 " beqzl $1, 1b \n"
385 "2: \n"
386 " .set pop \n"
387 : "=&r" (retval), "=R" (*m)
388 : "R" (*m), "Jr" (old), "Jr" (new)
389 : "memory");
390 } else if (cpu_has_llsc) {
391 __asm__ __volatile__(
392 " .set push \n"
393 " .set noat \n"
394 " .set mips3 \n"
395 "1: lld %0, %2 # __cmpxchg_u64 \n"
396 " bne %0, %z3, 2f \n"
397 " move $1, %z4 \n"
398 " scd $1, %1 \n"
399 " beqz $1, 1b \n"
400 "2: \n"
401 " .set pop \n"
402 : "=&r" (retval), "=R" (*m)
403 : "R" (*m), "Jr" (old), "Jr" (new)
404 : "memory");
405 } else {
406 unsigned long flags;
407
408 local_irq_save(flags);
409 retval = *m;
410 if (retval == old)
411 *m = new;
412 local_irq_restore(flags); /* implies memory barrier */
413 }
414
415 return retval;
416 }
417
418 #else
419 extern unsigned long __cmpxchg_u64_unsupported_on_32bit_kernels(
420 volatile int * m, unsigned long old, unsigned long new);
421 #define __cmpxchg_u64 __cmpxchg_u64_unsupported_on_32bit_kernels
422 extern unsigned long __cmpxchg_u64_local_unsupported_on_32bit_kernels(
423 volatile int * m, unsigned long old, unsigned long new);
424 #define __cmpxchg_u64_local __cmpxchg_u64_local_unsupported_on_32bit_kernels
425 #endif
426
427 /* This function doesn't exist, so you'll get a linker error
428 if something tries to do an invalid cmpxchg(). */
429 extern void __cmpxchg_called_with_bad_pointer(void);
430
431 static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old,
432 unsigned long new, int size)
433 {
434 switch (size) {
435 case 4:
436 return __cmpxchg_u32(ptr, old, new);
437 case 8:
438 return __cmpxchg_u64(ptr, old, new);
439 }
440 __cmpxchg_called_with_bad_pointer();
441 return old;
442 }
443
444 static inline unsigned long __cmpxchg_local(volatile void * ptr,
445 unsigned long old, unsigned long new, int size)
446 {
447 switch (size) {
448 case 4:
449 return __cmpxchg_u32_local(ptr, old, new);
450 case 8:
451 return __cmpxchg_u64_local(ptr, old, new);
452 }
453 __cmpxchg_called_with_bad_pointer();
454 return old;
455 }
456
457 #define cmpxchg(ptr,old,new) \
458 ((__typeof__(*(ptr)))__cmpxchg((ptr), \
459 (unsigned long)(old), (unsigned long)(new),sizeof(*(ptr))))
460
461 #define cmpxchg_local(ptr,old,new) \
462 ((__typeof__(*(ptr)))__cmpxchg_local((ptr), \
463 (unsigned long)(old), (unsigned long)(new),sizeof(*(ptr))))
464
465 extern void set_handler (unsigned long offset, void *addr, unsigned long len);
466 extern void set_uncached_handler (unsigned long offset, void *addr, unsigned long len);
467 extern void *set_vi_handler (int n, void *addr);
468 extern void *set_except_vector(int n, void *addr);
469 extern unsigned long ebase;
470 extern void per_cpu_trap_init(void);
471
472 extern int stop_a_enabled;
473
474 /*
475 * See include/asm-ia64/system.h; prevents deadlock on SMP
476 * systems.
477 */
478 #define __ARCH_WANT_UNLOCKED_CTXSW
479
480 #define arch_align_stack(x) (x)
481
482 #endif /* _ASM_SYSTEM_H */
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