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1da177e4 LT |
1 | /* |
2 | * include/asm-s390/system.h | |
3 | * | |
4 | * S390 version | |
5 | * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation | |
6 | * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), | |
7 | * | |
8 | * Derived from "include/asm-i386/system.h" | |
9 | */ | |
10 | ||
11 | #ifndef __ASM_SYSTEM_H | |
12 | #define __ASM_SYSTEM_H | |
13 | ||
14 | #include <linux/config.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <asm/types.h> | |
17 | #include <asm/ptrace.h> | |
18 | #include <asm/setup.h> | |
77fa2245 | 19 | #include <asm/processor.h> |
1da177e4 LT |
20 | |
21 | #ifdef __KERNEL__ | |
22 | ||
23 | struct task_struct; | |
24 | ||
25 | extern struct task_struct *__switch_to(void *, void *); | |
26 | ||
27 | #ifdef __s390x__ | |
28 | #define __FLAG_SHIFT 56 | |
29 | #else /* ! __s390x__ */ | |
30 | #define __FLAG_SHIFT 24 | |
31 | #endif /* ! __s390x__ */ | |
32 | ||
33 | static inline void save_fp_regs(s390_fp_regs *fpregs) | |
34 | { | |
35 | asm volatile ( | |
36 | " std 0,8(%1)\n" | |
37 | " std 2,24(%1)\n" | |
38 | " std 4,40(%1)\n" | |
39 | " std 6,56(%1)" | |
40 | : "=m" (*fpregs) : "a" (fpregs), "m" (*fpregs) : "memory" ); | |
41 | if (!MACHINE_HAS_IEEE) | |
42 | return; | |
43 | asm volatile( | |
44 | " stfpc 0(%1)\n" | |
45 | " std 1,16(%1)\n" | |
46 | " std 3,32(%1)\n" | |
47 | " std 5,48(%1)\n" | |
48 | " std 7,64(%1)\n" | |
49 | " std 8,72(%1)\n" | |
50 | " std 9,80(%1)\n" | |
51 | " std 10,88(%1)\n" | |
52 | " std 11,96(%1)\n" | |
53 | " std 12,104(%1)\n" | |
54 | " std 13,112(%1)\n" | |
55 | " std 14,120(%1)\n" | |
56 | " std 15,128(%1)\n" | |
57 | : "=m" (*fpregs) : "a" (fpregs), "m" (*fpregs) : "memory" ); | |
58 | } | |
59 | ||
60 | static inline void restore_fp_regs(s390_fp_regs *fpregs) | |
61 | { | |
62 | asm volatile ( | |
63 | " ld 0,8(%0)\n" | |
64 | " ld 2,24(%0)\n" | |
65 | " ld 4,40(%0)\n" | |
66 | " ld 6,56(%0)" | |
67 | : : "a" (fpregs), "m" (*fpregs) ); | |
68 | if (!MACHINE_HAS_IEEE) | |
69 | return; | |
70 | asm volatile( | |
71 | " lfpc 0(%0)\n" | |
72 | " ld 1,16(%0)\n" | |
73 | " ld 3,32(%0)\n" | |
74 | " ld 5,48(%0)\n" | |
75 | " ld 7,64(%0)\n" | |
76 | " ld 8,72(%0)\n" | |
77 | " ld 9,80(%0)\n" | |
78 | " ld 10,88(%0)\n" | |
79 | " ld 11,96(%0)\n" | |
80 | " ld 12,104(%0)\n" | |
81 | " ld 13,112(%0)\n" | |
82 | " ld 14,120(%0)\n" | |
83 | " ld 15,128(%0)\n" | |
84 | : : "a" (fpregs), "m" (*fpregs) ); | |
85 | } | |
86 | ||
87 | static inline void save_access_regs(unsigned int *acrs) | |
88 | { | |
89 | asm volatile ("stam 0,15,0(%0)" : : "a" (acrs) : "memory" ); | |
90 | } | |
91 | ||
92 | static inline void restore_access_regs(unsigned int *acrs) | |
93 | { | |
94 | asm volatile ("lam 0,15,0(%0)" : : "a" (acrs) ); | |
95 | } | |
96 | ||
97 | #define switch_to(prev,next,last) do { \ | |
98 | if (prev == next) \ | |
99 | break; \ | |
100 | save_fp_regs(&prev->thread.fp_regs); \ | |
101 | restore_fp_regs(&next->thread.fp_regs); \ | |
102 | save_access_regs(&prev->thread.acrs[0]); \ | |
103 | restore_access_regs(&next->thread.acrs[0]); \ | |
104 | prev = __switch_to(prev,next); \ | |
105 | } while (0) | |
106 | ||
1da177e4 LT |
107 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING |
108 | extern void account_user_vtime(struct task_struct *); | |
109 | extern void account_system_vtime(struct task_struct *); | |
4866cde0 | 110 | #endif |
1da177e4 | 111 | |
5ee24d95 | 112 | #define finish_arch_switch(prev) do { \ |
1da177e4 | 113 | set_fs(current->thread.mm_segment); \ |
4866cde0 | 114 | account_system_vtime(prev); \ |
1da177e4 LT |
115 | } while (0) |
116 | ||
1da177e4 LT |
117 | #define nop() __asm__ __volatile__ ("nop") |
118 | ||
119 | #define xchg(ptr,x) \ | |
120 | ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(void *)(ptr),sizeof(*(ptr)))) | |
121 | ||
122 | static inline unsigned long __xchg(unsigned long x, void * ptr, int size) | |
123 | { | |
124 | unsigned long addr, old; | |
125 | int shift; | |
126 | ||
127 | switch (size) { | |
128 | case 1: | |
129 | addr = (unsigned long) ptr; | |
130 | shift = (3 ^ (addr & 3)) << 3; | |
131 | addr ^= addr & 3; | |
132 | asm volatile( | |
133 | " l %0,0(%4)\n" | |
134 | "0: lr 0,%0\n" | |
135 | " nr 0,%3\n" | |
136 | " or 0,%2\n" | |
137 | " cs %0,0,0(%4)\n" | |
138 | " jl 0b\n" | |
139 | : "=&d" (old), "=m" (*(int *) addr) | |
140 | : "d" (x << shift), "d" (~(255 << shift)), "a" (addr), | |
141 | "m" (*(int *) addr) : "memory", "cc", "0" ); | |
142 | x = old >> shift; | |
143 | break; | |
144 | case 2: | |
145 | addr = (unsigned long) ptr; | |
146 | shift = (2 ^ (addr & 2)) << 3; | |
147 | addr ^= addr & 2; | |
148 | asm volatile( | |
149 | " l %0,0(%4)\n" | |
150 | "0: lr 0,%0\n" | |
151 | " nr 0,%3\n" | |
152 | " or 0,%2\n" | |
153 | " cs %0,0,0(%4)\n" | |
154 | " jl 0b\n" | |
155 | : "=&d" (old), "=m" (*(int *) addr) | |
156 | : "d" (x << shift), "d" (~(65535 << shift)), "a" (addr), | |
157 | "m" (*(int *) addr) : "memory", "cc", "0" ); | |
158 | x = old >> shift; | |
159 | break; | |
160 | case 4: | |
161 | asm volatile ( | |
162 | " l %0,0(%3)\n" | |
163 | "0: cs %0,%2,0(%3)\n" | |
164 | " jl 0b\n" | |
165 | : "=&d" (old), "=m" (*(int *) ptr) | |
166 | : "d" (x), "a" (ptr), "m" (*(int *) ptr) | |
167 | : "memory", "cc" ); | |
168 | x = old; | |
169 | break; | |
170 | #ifdef __s390x__ | |
171 | case 8: | |
172 | asm volatile ( | |
173 | " lg %0,0(%3)\n" | |
174 | "0: csg %0,%2,0(%3)\n" | |
175 | " jl 0b\n" | |
176 | : "=&d" (old), "=m" (*(long *) ptr) | |
177 | : "d" (x), "a" (ptr), "m" (*(long *) ptr) | |
178 | : "memory", "cc" ); | |
179 | x = old; | |
180 | break; | |
181 | #endif /* __s390x__ */ | |
182 | } | |
183 | return x; | |
184 | } | |
185 | ||
186 | /* | |
187 | * Atomic compare and exchange. Compare OLD with MEM, if identical, | |
188 | * store NEW in MEM. Return the initial value in MEM. Success is | |
189 | * indicated by comparing RETURN with OLD. | |
190 | */ | |
191 | ||
192 | #define __HAVE_ARCH_CMPXCHG 1 | |
193 | ||
194 | #define cmpxchg(ptr,o,n)\ | |
195 | ((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\ | |
196 | (unsigned long)(n),sizeof(*(ptr)))) | |
197 | ||
198 | static inline unsigned long | |
199 | __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size) | |
200 | { | |
201 | unsigned long addr, prev, tmp; | |
202 | int shift; | |
203 | ||
204 | switch (size) { | |
205 | case 1: | |
206 | addr = (unsigned long) ptr; | |
207 | shift = (3 ^ (addr & 3)) << 3; | |
208 | addr ^= addr & 3; | |
209 | asm volatile( | |
210 | " l %0,0(%4)\n" | |
211 | "0: nr %0,%5\n" | |
212 | " lr %1,%0\n" | |
213 | " or %0,%2\n" | |
214 | " or %1,%3\n" | |
215 | " cs %0,%1,0(%4)\n" | |
216 | " jnl 1f\n" | |
217 | " xr %1,%0\n" | |
218 | " nr %1,%5\n" | |
219 | " jnz 0b\n" | |
220 | "1:" | |
221 | : "=&d" (prev), "=&d" (tmp) | |
222 | : "d" (old << shift), "d" (new << shift), "a" (ptr), | |
223 | "d" (~(255 << shift)) | |
224 | : "memory", "cc" ); | |
225 | return prev >> shift; | |
226 | case 2: | |
227 | addr = (unsigned long) ptr; | |
228 | shift = (2 ^ (addr & 2)) << 3; | |
229 | addr ^= addr & 2; | |
230 | asm volatile( | |
231 | " l %0,0(%4)\n" | |
232 | "0: nr %0,%5\n" | |
233 | " lr %1,%0\n" | |
234 | " or %0,%2\n" | |
235 | " or %1,%3\n" | |
236 | " cs %0,%1,0(%4)\n" | |
237 | " jnl 1f\n" | |
238 | " xr %1,%0\n" | |
239 | " nr %1,%5\n" | |
240 | " jnz 0b\n" | |
241 | "1:" | |
242 | : "=&d" (prev), "=&d" (tmp) | |
243 | : "d" (old << shift), "d" (new << shift), "a" (ptr), | |
244 | "d" (~(65535 << shift)) | |
245 | : "memory", "cc" ); | |
246 | return prev >> shift; | |
247 | case 4: | |
248 | asm volatile ( | |
249 | " cs %0,%2,0(%3)\n" | |
250 | : "=&d" (prev) : "0" (old), "d" (new), "a" (ptr) | |
251 | : "memory", "cc" ); | |
252 | return prev; | |
253 | #ifdef __s390x__ | |
254 | case 8: | |
255 | asm volatile ( | |
256 | " csg %0,%2,0(%3)\n" | |
257 | : "=&d" (prev) : "0" (old), "d" (new), "a" (ptr) | |
258 | : "memory", "cc" ); | |
259 | return prev; | |
260 | #endif /* __s390x__ */ | |
261 | } | |
262 | return old; | |
263 | } | |
264 | ||
265 | /* | |
266 | * Force strict CPU ordering. | |
267 | * And yes, this is required on UP too when we're talking | |
268 | * to devices. | |
269 | * | |
270 | * This is very similar to the ppc eieio/sync instruction in that is | |
271 | * does a checkpoint syncronisation & makes sure that | |
272 | * all memory ops have completed wrt other CPU's ( see 7-15 POP DJB ). | |
273 | */ | |
274 | ||
275 | #define eieio() __asm__ __volatile__ ( "bcr 15,0" : : : "memory" ) | |
276 | # define SYNC_OTHER_CORES(x) eieio() | |
277 | #define mb() eieio() | |
278 | #define rmb() eieio() | |
279 | #define wmb() eieio() | |
280 | #define read_barrier_depends() do { } while(0) | |
281 | #define smp_mb() mb() | |
282 | #define smp_rmb() rmb() | |
283 | #define smp_wmb() wmb() | |
284 | #define smp_read_barrier_depends() read_barrier_depends() | |
285 | #define smp_mb__before_clear_bit() smp_mb() | |
286 | #define smp_mb__after_clear_bit() smp_mb() | |
287 | ||
288 | ||
289 | #define set_mb(var, value) do { var = value; mb(); } while (0) | |
290 | #define set_wmb(var, value) do { var = value; wmb(); } while (0) | |
291 | ||
292 | /* interrupt control.. */ | |
293 | #define local_irq_enable() ({ \ | |
294 | unsigned long __dummy; \ | |
295 | __asm__ __volatile__ ( \ | |
296 | "stosm 0(%1),0x03" \ | |
297 | : "=m" (__dummy) : "a" (&__dummy) : "memory" ); \ | |
298 | }) | |
299 | ||
300 | #define local_irq_disable() ({ \ | |
301 | unsigned long __flags; \ | |
302 | __asm__ __volatile__ ( \ | |
303 | "stnsm 0(%1),0xfc" : "=m" (__flags) : "a" (&__flags) ); \ | |
304 | __flags; \ | |
305 | }) | |
306 | ||
307 | #define local_save_flags(x) \ | |
308 | __asm__ __volatile__("stosm 0(%1),0" : "=m" (x) : "a" (&x), "m" (x) ) | |
309 | ||
310 | #define local_irq_restore(x) \ | |
311 | __asm__ __volatile__("ssm 0(%0)" : : "a" (&x), "m" (x) : "memory") | |
312 | ||
313 | #define irqs_disabled() \ | |
314 | ({ \ | |
315 | unsigned long flags; \ | |
316 | local_save_flags(flags); \ | |
317 | !((flags >> __FLAG_SHIFT) & 3); \ | |
318 | }) | |
319 | ||
320 | #ifdef __s390x__ | |
321 | ||
1da177e4 LT |
322 | #define __ctl_load(array, low, high) ({ \ |
323 | typedef struct { char _[sizeof(array)]; } addrtype; \ | |
324 | __asm__ __volatile__ ( \ | |
325 | " bras 1,0f\n" \ | |
326 | " lctlg 0,0,0(%0)\n" \ | |
327 | "0: ex %1,0(1)" \ | |
328 | : : "a" (&array), "a" (((low)<<4)+(high)), \ | |
329 | "m" (*(addrtype *)(array)) : "1" ); \ | |
330 | }) | |
331 | ||
332 | #define __ctl_store(array, low, high) ({ \ | |
333 | typedef struct { char _[sizeof(array)]; } addrtype; \ | |
334 | __asm__ __volatile__ ( \ | |
335 | " bras 1,0f\n" \ | |
336 | " stctg 0,0,0(%1)\n" \ | |
337 | "0: ex %2,0(1)" \ | |
338 | : "=m" (*(addrtype *)(array)) \ | |
339 | : "a" (&array), "a" (((low)<<4)+(high)) : "1" ); \ | |
340 | }) | |
341 | ||
342 | #define __ctl_set_bit(cr, bit) ({ \ | |
343 | __u8 __dummy[24]; \ | |
344 | __asm__ __volatile__ ( \ | |
345 | " bras 1,0f\n" /* skip indirect insns */ \ | |
346 | " stctg 0,0,0(%1)\n" \ | |
347 | " lctlg 0,0,0(%1)\n" \ | |
348 | "0: ex %2,0(1)\n" /* execute stctl */ \ | |
349 | " lg 0,0(%1)\n" \ | |
350 | " ogr 0,%3\n" /* set the bit */ \ | |
351 | " stg 0,0(%1)\n" \ | |
352 | "1: ex %2,6(1)" /* execute lctl */ \ | |
353 | : "=m" (__dummy) \ | |
354 | : "a" ((((unsigned long) &__dummy) + 7) & ~7UL), \ | |
355 | "a" (cr*17), "a" (1L<<(bit)) \ | |
356 | : "cc", "0", "1" ); \ | |
357 | }) | |
358 | ||
359 | #define __ctl_clear_bit(cr, bit) ({ \ | |
360 | __u8 __dummy[16]; \ | |
361 | __asm__ __volatile__ ( \ | |
362 | " bras 1,0f\n" /* skip indirect insns */ \ | |
363 | " stctg 0,0,0(%1)\n" \ | |
364 | " lctlg 0,0,0(%1)\n" \ | |
365 | "0: ex %2,0(1)\n" /* execute stctl */ \ | |
366 | " lg 0,0(%1)\n" \ | |
367 | " ngr 0,%3\n" /* set the bit */ \ | |
368 | " stg 0,0(%1)\n" \ | |
369 | "1: ex %2,6(1)" /* execute lctl */ \ | |
370 | : "=m" (__dummy) \ | |
371 | : "a" ((((unsigned long) &__dummy) + 7) & ~7UL), \ | |
372 | "a" (cr*17), "a" (~(1L<<(bit))) \ | |
373 | : "cc", "0", "1" ); \ | |
374 | }) | |
375 | ||
376 | #else /* __s390x__ */ | |
377 | ||
1da177e4 LT |
378 | #define __ctl_load(array, low, high) ({ \ |
379 | typedef struct { char _[sizeof(array)]; } addrtype; \ | |
380 | __asm__ __volatile__ ( \ | |
381 | " bras 1,0f\n" \ | |
382 | " lctl 0,0,0(%0)\n" \ | |
383 | "0: ex %1,0(1)" \ | |
384 | : : "a" (&array), "a" (((low)<<4)+(high)), \ | |
385 | "m" (*(addrtype *)(array)) : "1" ); \ | |
386 | }) | |
387 | ||
388 | #define __ctl_store(array, low, high) ({ \ | |
389 | typedef struct { char _[sizeof(array)]; } addrtype; \ | |
390 | __asm__ __volatile__ ( \ | |
391 | " bras 1,0f\n" \ | |
392 | " stctl 0,0,0(%1)\n" \ | |
393 | "0: ex %2,0(1)" \ | |
394 | : "=m" (*(addrtype *)(array)) \ | |
395 | : "a" (&array), "a" (((low)<<4)+(high)): "1" ); \ | |
396 | }) | |
397 | ||
398 | #define __ctl_set_bit(cr, bit) ({ \ | |
399 | __u8 __dummy[16]; \ | |
400 | __asm__ __volatile__ ( \ | |
401 | " bras 1,0f\n" /* skip indirect insns */ \ | |
402 | " stctl 0,0,0(%1)\n" \ | |
403 | " lctl 0,0,0(%1)\n" \ | |
404 | "0: ex %2,0(1)\n" /* execute stctl */ \ | |
405 | " l 0,0(%1)\n" \ | |
406 | " or 0,%3\n" /* set the bit */ \ | |
407 | " st 0,0(%1)\n" \ | |
408 | "1: ex %2,4(1)" /* execute lctl */ \ | |
409 | : "=m" (__dummy) \ | |
410 | : "a" ((((unsigned long) &__dummy) + 7) & ~7UL), \ | |
411 | "a" (cr*17), "a" (1<<(bit)) \ | |
412 | : "cc", "0", "1" ); \ | |
413 | }) | |
414 | ||
415 | #define __ctl_clear_bit(cr, bit) ({ \ | |
416 | __u8 __dummy[16]; \ | |
417 | __asm__ __volatile__ ( \ | |
418 | " bras 1,0f\n" /* skip indirect insns */ \ | |
419 | " stctl 0,0,0(%1)\n" \ | |
420 | " lctl 0,0,0(%1)\n" \ | |
421 | "0: ex %2,0(1)\n" /* execute stctl */ \ | |
422 | " l 0,0(%1)\n" \ | |
423 | " nr 0,%3\n" /* set the bit */ \ | |
424 | " st 0,0(%1)\n" \ | |
425 | "1: ex %2,4(1)" /* execute lctl */ \ | |
426 | : "=m" (__dummy) \ | |
427 | : "a" ((((unsigned long) &__dummy) + 7) & ~7UL), \ | |
428 | "a" (cr*17), "a" (~(1<<(bit))) \ | |
429 | : "cc", "0", "1" ); \ | |
430 | }) | |
431 | #endif /* __s390x__ */ | |
432 | ||
433 | /* For spinlocks etc */ | |
434 | #define local_irq_save(x) ((x) = local_irq_disable()) | |
435 | ||
77fa2245 HC |
436 | /* |
437 | * Use to set psw mask except for the first byte which | |
438 | * won't be changed by this function. | |
439 | */ | |
440 | static inline void | |
441 | __set_psw_mask(unsigned long mask) | |
442 | { | |
443 | local_save_flags(mask); | |
444 | __load_psw_mask(mask); | |
445 | } | |
446 | ||
447 | #define local_mcck_enable() __set_psw_mask(PSW_KERNEL_BITS) | |
448 | #define local_mcck_disable() __set_psw_mask(PSW_KERNEL_BITS & ~PSW_MASK_MCHECK) | |
449 | ||
1da177e4 LT |
450 | #ifdef CONFIG_SMP |
451 | ||
452 | extern void smp_ctl_set_bit(int cr, int bit); | |
453 | extern void smp_ctl_clear_bit(int cr, int bit); | |
454 | #define ctl_set_bit(cr, bit) smp_ctl_set_bit(cr, bit) | |
455 | #define ctl_clear_bit(cr, bit) smp_ctl_clear_bit(cr, bit) | |
456 | ||
457 | #else | |
458 | ||
459 | #define ctl_set_bit(cr, bit) __ctl_set_bit(cr, bit) | |
460 | #define ctl_clear_bit(cr, bit) __ctl_clear_bit(cr, bit) | |
461 | ||
462 | #endif /* CONFIG_SMP */ | |
463 | ||
464 | extern void (*_machine_restart)(char *command); | |
465 | extern void (*_machine_halt)(void); | |
466 | extern void (*_machine_power_off)(void); | |
467 | ||
468 | #define arch_align_stack(x) (x) | |
469 | ||
470 | #endif /* __KERNEL__ */ | |
471 | ||
472 | #endif | |
473 |