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1/*
2 * arch/arm/include/asm/atomic.h
3 *
4 * Copyright (C) 1996 Russell King.
5 * Copyright (C) 2002 Deep Blue Solutions Ltd.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11#ifndef __ASM_ARM_ATOMIC_H
12#define __ASM_ARM_ATOMIC_H
13
14#include <linux/compiler.h>
15#include <linux/prefetch.h>
16#include <linux/types.h>
17#include <linux/irqflags.h>
18#include <asm/barrier.h>
19#include <asm/cmpxchg.h>
20
21#define ATOMIC_INIT(i) { (i) }
22
23#ifdef __KERNEL__
24
25/*
26 * On ARM, ordinary assignment (str instruction) doesn't clear the local
27 * strex/ldrex monitor on some implementations. The reason we can use it for
28 * atomic_set() is the clrex or dummy strex done on every exception return.
29 */
30#define atomic_read(v) (*(volatile int *)&(v)->counter)
31#define atomic_set(v,i) (((v)->counter) = (i))
32
33#if __LINUX_ARM_ARCH__ >= 6
34
35/*
36 * ARMv6 UP and SMP safe atomic ops. We use load exclusive and
37 * store exclusive to ensure that these are atomic. We may loop
38 * to ensure that the update happens.
39 */
40static inline void atomic_add(int i, atomic_t *v)
41{
42 unsigned long tmp;
43 int result;
44
45 prefetchw(&v->counter);
46 __asm__ __volatile__("@ atomic_add\n"
47"1: ldrex %0, [%3]\n"
48" add %0, %0, %4\n"
49" strex %1, %0, [%3]\n"
50" teq %1, #0\n"
51" bne 1b"
52 : "=&r" (result), "=&r" (tmp), "+Qo" (v->counter)
53 : "r" (&v->counter), "Ir" (i)
54 : "cc");
55}
56
57static inline int atomic_add_return(int i, atomic_t *v)
58{
59 unsigned long tmp;
60 int result;
61
62 smp_mb();
63 prefetchw(&v->counter);
64
65 __asm__ __volatile__("@ atomic_add_return\n"
66"1: ldrex %0, [%3]\n"
67" add %0, %0, %4\n"
68" strex %1, %0, [%3]\n"
69" teq %1, #0\n"
70" bne 1b"
71 : "=&r" (result), "=&r" (tmp), "+Qo" (v->counter)
72 : "r" (&v->counter), "Ir" (i)
73 : "cc");
74
75 smp_mb();
76
77 return result;
78}
79
80static inline void atomic_sub(int i, atomic_t *v)
81{
82 unsigned long tmp;
83 int result;
84
85 prefetchw(&v->counter);
86 __asm__ __volatile__("@ atomic_sub\n"
87"1: ldrex %0, [%3]\n"
88" sub %0, %0, %4\n"
89" strex %1, %0, [%3]\n"
90" teq %1, #0\n"
91" bne 1b"
92 : "=&r" (result), "=&r" (tmp), "+Qo" (v->counter)
93 : "r" (&v->counter), "Ir" (i)
94 : "cc");
95}
96
97static inline int atomic_sub_return(int i, atomic_t *v)
98{
99 unsigned long tmp;
100 int result;
101
102 smp_mb();
103 prefetchw(&v->counter);
104
105 __asm__ __volatile__("@ atomic_sub_return\n"
106"1: ldrex %0, [%3]\n"
107" sub %0, %0, %4\n"
108" strex %1, %0, [%3]\n"
109" teq %1, #0\n"
110" bne 1b"
111 : "=&r" (result), "=&r" (tmp), "+Qo" (v->counter)
112 : "r" (&v->counter), "Ir" (i)
113 : "cc");
114
115 smp_mb();
116
117 return result;
118}
119
120static inline int atomic_cmpxchg(atomic_t *ptr, int old, int new)
121{
122 int oldval;
123 unsigned long res;
124
125 smp_mb();
126 prefetchw(&ptr->counter);
127
128 do {
129 __asm__ __volatile__("@ atomic_cmpxchg\n"
130 "ldrex %1, [%3]\n"
131 "mov %0, #0\n"
132 "teq %1, %4\n"
133 "strexeq %0, %5, [%3]\n"
134 : "=&r" (res), "=&r" (oldval), "+Qo" (ptr->counter)
135 : "r" (&ptr->counter), "Ir" (old), "r" (new)
136 : "cc");
137 } while (res);
138
139 smp_mb();
140
141 return oldval;
142}
143
144static inline int __atomic_add_unless(atomic_t *v, int a, int u)
145{
146 int oldval, newval;
147 unsigned long tmp;
148
149 smp_mb();
150 prefetchw(&v->counter);
151
152 __asm__ __volatile__ ("@ atomic_add_unless\n"
153"1: ldrex %0, [%4]\n"
154" teq %0, %5\n"
155" beq 2f\n"
156" add %1, %0, %6\n"
157" strex %2, %1, [%4]\n"
158" teq %2, #0\n"
159" bne 1b\n"
160"2:"
161 : "=&r" (oldval), "=&r" (newval), "=&r" (tmp), "+Qo" (v->counter)
162 : "r" (&v->counter), "r" (u), "r" (a)
163 : "cc");
164
165 if (oldval != u)
166 smp_mb();
167
168 return oldval;
169}
170
171#else /* ARM_ARCH_6 */
172
173#ifdef CONFIG_SMP
174#error SMP not supported on pre-ARMv6 CPUs
175#endif
176
177static inline int atomic_add_return(int i, atomic_t *v)
178{
179 unsigned long flags;
180 int val;
181
182 raw_local_irq_save(flags);
183 val = v->counter;
184 v->counter = val += i;
185 raw_local_irq_restore(flags);
186
187 return val;
188}
189#define atomic_add(i, v) (void) atomic_add_return(i, v)
190
191static inline int atomic_sub_return(int i, atomic_t *v)
192{
193 unsigned long flags;
194 int val;
195
196 raw_local_irq_save(flags);
197 val = v->counter;
198 v->counter = val -= i;
199 raw_local_irq_restore(flags);
200
201 return val;
202}
203#define atomic_sub(i, v) (void) atomic_sub_return(i, v)
204
205static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
206{
207 int ret;
208 unsigned long flags;
209
210 raw_local_irq_save(flags);
211 ret = v->counter;
212 if (likely(ret == old))
213 v->counter = new;
214 raw_local_irq_restore(flags);
215
216 return ret;
217}
218
219static inline int __atomic_add_unless(atomic_t *v, int a, int u)
220{
221 int c, old;
222
223 c = atomic_read(v);
224 while (c != u && (old = atomic_cmpxchg((v), c, c + a)) != c)
225 c = old;
226 return c;
227}
228
229#endif /* __LINUX_ARM_ARCH__ */
230
231#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
232
233#define atomic_inc(v) atomic_add(1, v)
234#define atomic_dec(v) atomic_sub(1, v)
235
236#define atomic_inc_and_test(v) (atomic_add_return(1, v) == 0)
237#define atomic_dec_and_test(v) (atomic_sub_return(1, v) == 0)
238#define atomic_inc_return(v) (atomic_add_return(1, v))
239#define atomic_dec_return(v) (atomic_sub_return(1, v))
240#define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0)
241
242#define atomic_add_negative(i,v) (atomic_add_return(i, v) < 0)
243
244#define smp_mb__before_atomic_dec() smp_mb()
245#define smp_mb__after_atomic_dec() smp_mb()
246#define smp_mb__before_atomic_inc() smp_mb()
247#define smp_mb__after_atomic_inc() smp_mb()
248
249#ifndef CONFIG_GENERIC_ATOMIC64
250typedef struct {
251 long long counter;
252} atomic64_t;
253
254#define ATOMIC64_INIT(i) { (i) }
255
256#ifdef CONFIG_ARM_LPAE
257static inline long long atomic64_read(const atomic64_t *v)
258{
259 long long result;
260
261 __asm__ __volatile__("@ atomic64_read\n"
262" ldrd %0, %H0, [%1]"
263 : "=&r" (result)
264 : "r" (&v->counter), "Qo" (v->counter)
265 );
266
267 return result;
268}
269
270static inline void atomic64_set(atomic64_t *v, long long i)
271{
272 __asm__ __volatile__("@ atomic64_set\n"
273" strd %2, %H2, [%1]"
274 : "=Qo" (v->counter)
275 : "r" (&v->counter), "r" (i)
276 );
277}
278#else
279static inline long long atomic64_read(const atomic64_t *v)
280{
281 long long result;
282
283 __asm__ __volatile__("@ atomic64_read\n"
284" ldrexd %0, %H0, [%1]"
285 : "=&r" (result)
286 : "r" (&v->counter), "Qo" (v->counter)
287 );
288
289 return result;
290}
291
292static inline void atomic64_set(atomic64_t *v, long long i)
293{
294 long long tmp;
295
296 prefetchw(&v->counter);
297 __asm__ __volatile__("@ atomic64_set\n"
298"1: ldrexd %0, %H0, [%2]\n"
299" strexd %0, %3, %H3, [%2]\n"
300" teq %0, #0\n"
301" bne 1b"
302 : "=&r" (tmp), "=Qo" (v->counter)
303 : "r" (&v->counter), "r" (i)
304 : "cc");
305}
306#endif
307
308static inline void atomic64_add(long long i, atomic64_t *v)
309{
310 long long result;
311 unsigned long tmp;
312
313 prefetchw(&v->counter);
314 __asm__ __volatile__("@ atomic64_add\n"
315"1: ldrexd %0, %H0, [%3]\n"
316" adds %Q0, %Q0, %Q4\n"
317" adc %R0, %R0, %R4\n"
318" strexd %1, %0, %H0, [%3]\n"
319" teq %1, #0\n"
320" bne 1b"
321 : "=&r" (result), "=&r" (tmp), "+Qo" (v->counter)
322 : "r" (&v->counter), "r" (i)
323 : "cc");
324}
325
326static inline long long atomic64_add_return(long long i, atomic64_t *v)
327{
328 long long result;
329 unsigned long tmp;
330
331 smp_mb();
332 prefetchw(&v->counter);
333
334 __asm__ __volatile__("@ atomic64_add_return\n"
335"1: ldrexd %0, %H0, [%3]\n"
336" adds %Q0, %Q0, %Q4\n"
337" adc %R0, %R0, %R4\n"
338" strexd %1, %0, %H0, [%3]\n"
339" teq %1, #0\n"
340" bne 1b"
341 : "=&r" (result), "=&r" (tmp), "+Qo" (v->counter)
342 : "r" (&v->counter), "r" (i)
343 : "cc");
344
345 smp_mb();
346
347 return result;
348}
349
350static inline void atomic64_sub(long long i, atomic64_t *v)
351{
352 long long result;
353 unsigned long tmp;
354
355 prefetchw(&v->counter);
356 __asm__ __volatile__("@ atomic64_sub\n"
357"1: ldrexd %0, %H0, [%3]\n"
358" subs %Q0, %Q0, %Q4\n"
359" sbc %R0, %R0, %R4\n"
360" strexd %1, %0, %H0, [%3]\n"
361" teq %1, #0\n"
362" bne 1b"
363 : "=&r" (result), "=&r" (tmp), "+Qo" (v->counter)
364 : "r" (&v->counter), "r" (i)
365 : "cc");
366}
367
368static inline long long atomic64_sub_return(long long i, atomic64_t *v)
369{
370 long long result;
371 unsigned long tmp;
372
373 smp_mb();
374 prefetchw(&v->counter);
375
376 __asm__ __volatile__("@ atomic64_sub_return\n"
377"1: ldrexd %0, %H0, [%3]\n"
378" subs %Q0, %Q0, %Q4\n"
379" sbc %R0, %R0, %R4\n"
380" strexd %1, %0, %H0, [%3]\n"
381" teq %1, #0\n"
382" bne 1b"
383 : "=&r" (result), "=&r" (tmp), "+Qo" (v->counter)
384 : "r" (&v->counter), "r" (i)
385 : "cc");
386
387 smp_mb();
388
389 return result;
390}
391
392static inline long long atomic64_cmpxchg(atomic64_t *ptr, long long old,
393 long long new)
394{
395 long long oldval;
396 unsigned long res;
397
398 smp_mb();
399 prefetchw(&ptr->counter);
400
401 do {
402 __asm__ __volatile__("@ atomic64_cmpxchg\n"
403 "ldrexd %1, %H1, [%3]\n"
404 "mov %0, #0\n"
405 "teq %1, %4\n"
406 "teqeq %H1, %H4\n"
407 "strexdeq %0, %5, %H5, [%3]"
408 : "=&r" (res), "=&r" (oldval), "+Qo" (ptr->counter)
409 : "r" (&ptr->counter), "r" (old), "r" (new)
410 : "cc");
411 } while (res);
412
413 smp_mb();
414
415 return oldval;
416}
417
418static inline long long atomic64_xchg(atomic64_t *ptr, long long new)
419{
420 long long result;
421 unsigned long tmp;
422
423 smp_mb();
424 prefetchw(&ptr->counter);
425
426 __asm__ __volatile__("@ atomic64_xchg\n"
427"1: ldrexd %0, %H0, [%3]\n"
428" strexd %1, %4, %H4, [%3]\n"
429" teq %1, #0\n"
430" bne 1b"
431 : "=&r" (result), "=&r" (tmp), "+Qo" (ptr->counter)
432 : "r" (&ptr->counter), "r" (new)
433 : "cc");
434
435 smp_mb();
436
437 return result;
438}
439
440static inline long long atomic64_dec_if_positive(atomic64_t *v)
441{
442 long long result;
443 unsigned long tmp;
444
445 smp_mb();
446 prefetchw(&v->counter);
447
448 __asm__ __volatile__("@ atomic64_dec_if_positive\n"
449"1: ldrexd %0, %H0, [%3]\n"
450" subs %Q0, %Q0, #1\n"
451" sbc %R0, %R0, #0\n"
452" teq %R0, #0\n"
453" bmi 2f\n"
454" strexd %1, %0, %H0, [%3]\n"
455" teq %1, #0\n"
456" bne 1b\n"
457"2:"
458 : "=&r" (result), "=&r" (tmp), "+Qo" (v->counter)
459 : "r" (&v->counter)
460 : "cc");
461
462 smp_mb();
463
464 return result;
465}
466
467static inline int atomic64_add_unless(atomic64_t *v, long long a, long long u)
468{
469 long long val;
470 unsigned long tmp;
471 int ret = 1;
472
473 smp_mb();
474 prefetchw(&v->counter);
475
476 __asm__ __volatile__("@ atomic64_add_unless\n"
477"1: ldrexd %0, %H0, [%4]\n"
478" teq %0, %5\n"
479" teqeq %H0, %H5\n"
480" moveq %1, #0\n"
481" beq 2f\n"
482" adds %Q0, %Q0, %Q6\n"
483" adc %R0, %R0, %R6\n"
484" strexd %2, %0, %H0, [%4]\n"
485" teq %2, #0\n"
486" bne 1b\n"
487"2:"
488 : "=&r" (val), "+r" (ret), "=&r" (tmp), "+Qo" (v->counter)
489 : "r" (&v->counter), "r" (u), "r" (a)
490 : "cc");
491
492 if (ret)
493 smp_mb();
494
495 return ret;
496}
497
498#define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0)
499#define atomic64_inc(v) atomic64_add(1LL, (v))
500#define atomic64_inc_return(v) atomic64_add_return(1LL, (v))
501#define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0)
502#define atomic64_sub_and_test(a, v) (atomic64_sub_return((a), (v)) == 0)
503#define atomic64_dec(v) atomic64_sub(1LL, (v))
504#define atomic64_dec_return(v) atomic64_sub_return(1LL, (v))
505#define atomic64_dec_and_test(v) (atomic64_dec_return((v)) == 0)
506#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1LL, 0LL)
507
508#endif /* !CONFIG_GENERIC_ATOMIC64 */
509#endif
510#endif
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * arch/arm/include/asm/atomic.h
4 *
5 * Copyright (C) 1996 Russell King.
6 * Copyright (C) 2002 Deep Blue Solutions Ltd.
7 */
8#ifndef __ASM_ARM_ATOMIC_H
9#define __ASM_ARM_ATOMIC_H
10
11#include <linux/compiler.h>
12#include <linux/prefetch.h>
13#include <linux/types.h>
14#include <linux/irqflags.h>
15#include <asm/barrier.h>
16#include <asm/cmpxchg.h>
17
18#ifdef __KERNEL__
19
20/*
21 * On ARM, ordinary assignment (str instruction) doesn't clear the local
22 * strex/ldrex monitor on some implementations. The reason we can use it for
23 * atomic_set() is the clrex or dummy strex done on every exception return.
24 */
25#define arch_atomic_read(v) READ_ONCE((v)->counter)
26#define arch_atomic_set(v,i) WRITE_ONCE(((v)->counter), (i))
27
28#if __LINUX_ARM_ARCH__ >= 6
29
30/*
31 * ARMv6 UP and SMP safe atomic ops. We use load exclusive and
32 * store exclusive to ensure that these are atomic. We may loop
33 * to ensure that the update happens.
34 */
35
36#define ATOMIC_OP(op, c_op, asm_op) \
37static inline void arch_atomic_##op(int i, atomic_t *v) \
38{ \
39 unsigned long tmp; \
40 int result; \
41 \
42 prefetchw(&v->counter); \
43 __asm__ __volatile__("@ atomic_" #op "\n" \
44"1: ldrex %0, [%3]\n" \
45" " #asm_op " %0, %0, %4\n" \
46" strex %1, %0, [%3]\n" \
47" teq %1, #0\n" \
48" bne 1b" \
49 : "=&r" (result), "=&r" (tmp), "+Qo" (v->counter) \
50 : "r" (&v->counter), "Ir" (i) \
51 : "cc"); \
52} \
53
54#define ATOMIC_OP_RETURN(op, c_op, asm_op) \
55static inline int arch_atomic_##op##_return_relaxed(int i, atomic_t *v) \
56{ \
57 unsigned long tmp; \
58 int result; \
59 \
60 prefetchw(&v->counter); \
61 \
62 __asm__ __volatile__("@ atomic_" #op "_return\n" \
63"1: ldrex %0, [%3]\n" \
64" " #asm_op " %0, %0, %4\n" \
65" strex %1, %0, [%3]\n" \
66" teq %1, #0\n" \
67" bne 1b" \
68 : "=&r" (result), "=&r" (tmp), "+Qo" (v->counter) \
69 : "r" (&v->counter), "Ir" (i) \
70 : "cc"); \
71 \
72 return result; \
73}
74
75#define ATOMIC_FETCH_OP(op, c_op, asm_op) \
76static inline int arch_atomic_fetch_##op##_relaxed(int i, atomic_t *v) \
77{ \
78 unsigned long tmp; \
79 int result, val; \
80 \
81 prefetchw(&v->counter); \
82 \
83 __asm__ __volatile__("@ atomic_fetch_" #op "\n" \
84"1: ldrex %0, [%4]\n" \
85" " #asm_op " %1, %0, %5\n" \
86" strex %2, %1, [%4]\n" \
87" teq %2, #0\n" \
88" bne 1b" \
89 : "=&r" (result), "=&r" (val), "=&r" (tmp), "+Qo" (v->counter) \
90 : "r" (&v->counter), "Ir" (i) \
91 : "cc"); \
92 \
93 return result; \
94}
95
96#define arch_atomic_add_return_relaxed arch_atomic_add_return_relaxed
97#define arch_atomic_sub_return_relaxed arch_atomic_sub_return_relaxed
98#define arch_atomic_fetch_add_relaxed arch_atomic_fetch_add_relaxed
99#define arch_atomic_fetch_sub_relaxed arch_atomic_fetch_sub_relaxed
100
101#define arch_atomic_fetch_and_relaxed arch_atomic_fetch_and_relaxed
102#define arch_atomic_fetch_andnot_relaxed arch_atomic_fetch_andnot_relaxed
103#define arch_atomic_fetch_or_relaxed arch_atomic_fetch_or_relaxed
104#define arch_atomic_fetch_xor_relaxed arch_atomic_fetch_xor_relaxed
105
106static inline int arch_atomic_cmpxchg_relaxed(atomic_t *ptr, int old, int new)
107{
108 int oldval;
109 unsigned long res;
110
111 prefetchw(&ptr->counter);
112
113 do {
114 __asm__ __volatile__("@ atomic_cmpxchg\n"
115 "ldrex %1, [%3]\n"
116 "mov %0, #0\n"
117 "teq %1, %4\n"
118 "strexeq %0, %5, [%3]\n"
119 : "=&r" (res), "=&r" (oldval), "+Qo" (ptr->counter)
120 : "r" (&ptr->counter), "Ir" (old), "r" (new)
121 : "cc");
122 } while (res);
123
124 return oldval;
125}
126#define arch_atomic_cmpxchg_relaxed arch_atomic_cmpxchg_relaxed
127
128static inline int arch_atomic_fetch_add_unless(atomic_t *v, int a, int u)
129{
130 int oldval, newval;
131 unsigned long tmp;
132
133 smp_mb();
134 prefetchw(&v->counter);
135
136 __asm__ __volatile__ ("@ atomic_add_unless\n"
137"1: ldrex %0, [%4]\n"
138" teq %0, %5\n"
139" beq 2f\n"
140" add %1, %0, %6\n"
141" strex %2, %1, [%4]\n"
142" teq %2, #0\n"
143" bne 1b\n"
144"2:"
145 : "=&r" (oldval), "=&r" (newval), "=&r" (tmp), "+Qo" (v->counter)
146 : "r" (&v->counter), "r" (u), "r" (a)
147 : "cc");
148
149 if (oldval != u)
150 smp_mb();
151
152 return oldval;
153}
154#define arch_atomic_fetch_add_unless arch_atomic_fetch_add_unless
155
156#else /* ARM_ARCH_6 */
157
158#ifdef CONFIG_SMP
159#error SMP not supported on pre-ARMv6 CPUs
160#endif
161
162#define ATOMIC_OP(op, c_op, asm_op) \
163static inline void arch_atomic_##op(int i, atomic_t *v) \
164{ \
165 unsigned long flags; \
166 \
167 raw_local_irq_save(flags); \
168 v->counter c_op i; \
169 raw_local_irq_restore(flags); \
170} \
171
172#define ATOMIC_OP_RETURN(op, c_op, asm_op) \
173static inline int arch_atomic_##op##_return(int i, atomic_t *v) \
174{ \
175 unsigned long flags; \
176 int val; \
177 \
178 raw_local_irq_save(flags); \
179 v->counter c_op i; \
180 val = v->counter; \
181 raw_local_irq_restore(flags); \
182 \
183 return val; \
184}
185
186#define ATOMIC_FETCH_OP(op, c_op, asm_op) \
187static inline int arch_atomic_fetch_##op(int i, atomic_t *v) \
188{ \
189 unsigned long flags; \
190 int val; \
191 \
192 raw_local_irq_save(flags); \
193 val = v->counter; \
194 v->counter c_op i; \
195 raw_local_irq_restore(flags); \
196 \
197 return val; \
198}
199
200#define arch_atomic_add_return arch_atomic_add_return
201#define arch_atomic_sub_return arch_atomic_sub_return
202#define arch_atomic_fetch_add arch_atomic_fetch_add
203#define arch_atomic_fetch_sub arch_atomic_fetch_sub
204
205#define arch_atomic_fetch_and arch_atomic_fetch_and
206#define arch_atomic_fetch_andnot arch_atomic_fetch_andnot
207#define arch_atomic_fetch_or arch_atomic_fetch_or
208#define arch_atomic_fetch_xor arch_atomic_fetch_xor
209
210static inline int arch_atomic_cmpxchg(atomic_t *v, int old, int new)
211{
212 int ret;
213 unsigned long flags;
214
215 raw_local_irq_save(flags);
216 ret = v->counter;
217 if (likely(ret == old))
218 v->counter = new;
219 raw_local_irq_restore(flags);
220
221 return ret;
222}
223#define arch_atomic_cmpxchg arch_atomic_cmpxchg
224
225#endif /* __LINUX_ARM_ARCH__ */
226
227#define ATOMIC_OPS(op, c_op, asm_op) \
228 ATOMIC_OP(op, c_op, asm_op) \
229 ATOMIC_OP_RETURN(op, c_op, asm_op) \
230 ATOMIC_FETCH_OP(op, c_op, asm_op)
231
232ATOMIC_OPS(add, +=, add)
233ATOMIC_OPS(sub, -=, sub)
234
235#define arch_atomic_andnot arch_atomic_andnot
236
237#undef ATOMIC_OPS
238#define ATOMIC_OPS(op, c_op, asm_op) \
239 ATOMIC_OP(op, c_op, asm_op) \
240 ATOMIC_FETCH_OP(op, c_op, asm_op)
241
242ATOMIC_OPS(and, &=, and)
243ATOMIC_OPS(andnot, &= ~, bic)
244ATOMIC_OPS(or, |=, orr)
245ATOMIC_OPS(xor, ^=, eor)
246
247#undef ATOMIC_OPS
248#undef ATOMIC_FETCH_OP
249#undef ATOMIC_OP_RETURN
250#undef ATOMIC_OP
251
252#ifndef CONFIG_GENERIC_ATOMIC64
253typedef struct {
254 s64 counter;
255} atomic64_t;
256
257#define ATOMIC64_INIT(i) { (i) }
258
259#ifdef CONFIG_ARM_LPAE
260static inline s64 arch_atomic64_read(const atomic64_t *v)
261{
262 s64 result;
263
264 __asm__ __volatile__("@ atomic64_read\n"
265" ldrd %0, %H0, [%1]"
266 : "=&r" (result)
267 : "r" (&v->counter), "Qo" (v->counter)
268 );
269
270 return result;
271}
272
273static inline void arch_atomic64_set(atomic64_t *v, s64 i)
274{
275 __asm__ __volatile__("@ atomic64_set\n"
276" strd %2, %H2, [%1]"
277 : "=Qo" (v->counter)
278 : "r" (&v->counter), "r" (i)
279 );
280}
281#else
282static inline s64 arch_atomic64_read(const atomic64_t *v)
283{
284 s64 result;
285
286 __asm__ __volatile__("@ atomic64_read\n"
287" ldrexd %0, %H0, [%1]"
288 : "=&r" (result)
289 : "r" (&v->counter), "Qo" (v->counter)
290 );
291
292 return result;
293}
294
295static inline void arch_atomic64_set(atomic64_t *v, s64 i)
296{
297 s64 tmp;
298
299 prefetchw(&v->counter);
300 __asm__ __volatile__("@ atomic64_set\n"
301"1: ldrexd %0, %H0, [%2]\n"
302" strexd %0, %3, %H3, [%2]\n"
303" teq %0, #0\n"
304" bne 1b"
305 : "=&r" (tmp), "=Qo" (v->counter)
306 : "r" (&v->counter), "r" (i)
307 : "cc");
308}
309#endif
310
311#define ATOMIC64_OP(op, op1, op2) \
312static inline void arch_atomic64_##op(s64 i, atomic64_t *v) \
313{ \
314 s64 result; \
315 unsigned long tmp; \
316 \
317 prefetchw(&v->counter); \
318 __asm__ __volatile__("@ atomic64_" #op "\n" \
319"1: ldrexd %0, %H0, [%3]\n" \
320" " #op1 " %Q0, %Q0, %Q4\n" \
321" " #op2 " %R0, %R0, %R4\n" \
322" strexd %1, %0, %H0, [%3]\n" \
323" teq %1, #0\n" \
324" bne 1b" \
325 : "=&r" (result), "=&r" (tmp), "+Qo" (v->counter) \
326 : "r" (&v->counter), "r" (i) \
327 : "cc"); \
328} \
329
330#define ATOMIC64_OP_RETURN(op, op1, op2) \
331static inline s64 \
332arch_atomic64_##op##_return_relaxed(s64 i, atomic64_t *v) \
333{ \
334 s64 result; \
335 unsigned long tmp; \
336 \
337 prefetchw(&v->counter); \
338 \
339 __asm__ __volatile__("@ atomic64_" #op "_return\n" \
340"1: ldrexd %0, %H0, [%3]\n" \
341" " #op1 " %Q0, %Q0, %Q4\n" \
342" " #op2 " %R0, %R0, %R4\n" \
343" strexd %1, %0, %H0, [%3]\n" \
344" teq %1, #0\n" \
345" bne 1b" \
346 : "=&r" (result), "=&r" (tmp), "+Qo" (v->counter) \
347 : "r" (&v->counter), "r" (i) \
348 : "cc"); \
349 \
350 return result; \
351}
352
353#define ATOMIC64_FETCH_OP(op, op1, op2) \
354static inline s64 \
355arch_atomic64_fetch_##op##_relaxed(s64 i, atomic64_t *v) \
356{ \
357 s64 result, val; \
358 unsigned long tmp; \
359 \
360 prefetchw(&v->counter); \
361 \
362 __asm__ __volatile__("@ atomic64_fetch_" #op "\n" \
363"1: ldrexd %0, %H0, [%4]\n" \
364" " #op1 " %Q1, %Q0, %Q5\n" \
365" " #op2 " %R1, %R0, %R5\n" \
366" strexd %2, %1, %H1, [%4]\n" \
367" teq %2, #0\n" \
368" bne 1b" \
369 : "=&r" (result), "=&r" (val), "=&r" (tmp), "+Qo" (v->counter) \
370 : "r" (&v->counter), "r" (i) \
371 : "cc"); \
372 \
373 return result; \
374}
375
376#define ATOMIC64_OPS(op, op1, op2) \
377 ATOMIC64_OP(op, op1, op2) \
378 ATOMIC64_OP_RETURN(op, op1, op2) \
379 ATOMIC64_FETCH_OP(op, op1, op2)
380
381ATOMIC64_OPS(add, adds, adc)
382ATOMIC64_OPS(sub, subs, sbc)
383
384#define arch_atomic64_add_return_relaxed arch_atomic64_add_return_relaxed
385#define arch_atomic64_sub_return_relaxed arch_atomic64_sub_return_relaxed
386#define arch_atomic64_fetch_add_relaxed arch_atomic64_fetch_add_relaxed
387#define arch_atomic64_fetch_sub_relaxed arch_atomic64_fetch_sub_relaxed
388
389#undef ATOMIC64_OPS
390#define ATOMIC64_OPS(op, op1, op2) \
391 ATOMIC64_OP(op, op1, op2) \
392 ATOMIC64_FETCH_OP(op, op1, op2)
393
394#define arch_atomic64_andnot arch_atomic64_andnot
395
396ATOMIC64_OPS(and, and, and)
397ATOMIC64_OPS(andnot, bic, bic)
398ATOMIC64_OPS(or, orr, orr)
399ATOMIC64_OPS(xor, eor, eor)
400
401#define arch_atomic64_fetch_and_relaxed arch_atomic64_fetch_and_relaxed
402#define arch_atomic64_fetch_andnot_relaxed arch_atomic64_fetch_andnot_relaxed
403#define arch_atomic64_fetch_or_relaxed arch_atomic64_fetch_or_relaxed
404#define arch_atomic64_fetch_xor_relaxed arch_atomic64_fetch_xor_relaxed
405
406#undef ATOMIC64_OPS
407#undef ATOMIC64_FETCH_OP
408#undef ATOMIC64_OP_RETURN
409#undef ATOMIC64_OP
410
411static inline s64 arch_atomic64_cmpxchg_relaxed(atomic64_t *ptr, s64 old, s64 new)
412{
413 s64 oldval;
414 unsigned long res;
415
416 prefetchw(&ptr->counter);
417
418 do {
419 __asm__ __volatile__("@ atomic64_cmpxchg\n"
420 "ldrexd %1, %H1, [%3]\n"
421 "mov %0, #0\n"
422 "teq %1, %4\n"
423 "teqeq %H1, %H4\n"
424 "strexdeq %0, %5, %H5, [%3]"
425 : "=&r" (res), "=&r" (oldval), "+Qo" (ptr->counter)
426 : "r" (&ptr->counter), "r" (old), "r" (new)
427 : "cc");
428 } while (res);
429
430 return oldval;
431}
432#define arch_atomic64_cmpxchg_relaxed arch_atomic64_cmpxchg_relaxed
433
434static inline s64 arch_atomic64_xchg_relaxed(atomic64_t *ptr, s64 new)
435{
436 s64 result;
437 unsigned long tmp;
438
439 prefetchw(&ptr->counter);
440
441 __asm__ __volatile__("@ atomic64_xchg\n"
442"1: ldrexd %0, %H0, [%3]\n"
443" strexd %1, %4, %H4, [%3]\n"
444" teq %1, #0\n"
445" bne 1b"
446 : "=&r" (result), "=&r" (tmp), "+Qo" (ptr->counter)
447 : "r" (&ptr->counter), "r" (new)
448 : "cc");
449
450 return result;
451}
452#define arch_atomic64_xchg_relaxed arch_atomic64_xchg_relaxed
453
454static inline s64 arch_atomic64_dec_if_positive(atomic64_t *v)
455{
456 s64 result;
457 unsigned long tmp;
458
459 smp_mb();
460 prefetchw(&v->counter);
461
462 __asm__ __volatile__("@ atomic64_dec_if_positive\n"
463"1: ldrexd %0, %H0, [%3]\n"
464" subs %Q0, %Q0, #1\n"
465" sbc %R0, %R0, #0\n"
466" teq %R0, #0\n"
467" bmi 2f\n"
468" strexd %1, %0, %H0, [%3]\n"
469" teq %1, #0\n"
470" bne 1b\n"
471"2:"
472 : "=&r" (result), "=&r" (tmp), "+Qo" (v->counter)
473 : "r" (&v->counter)
474 : "cc");
475
476 smp_mb();
477
478 return result;
479}
480#define arch_atomic64_dec_if_positive arch_atomic64_dec_if_positive
481
482static inline s64 arch_atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u)
483{
484 s64 oldval, newval;
485 unsigned long tmp;
486
487 smp_mb();
488 prefetchw(&v->counter);
489
490 __asm__ __volatile__("@ atomic64_add_unless\n"
491"1: ldrexd %0, %H0, [%4]\n"
492" teq %0, %5\n"
493" teqeq %H0, %H5\n"
494" beq 2f\n"
495" adds %Q1, %Q0, %Q6\n"
496" adc %R1, %R0, %R6\n"
497" strexd %2, %1, %H1, [%4]\n"
498" teq %2, #0\n"
499" bne 1b\n"
500"2:"
501 : "=&r" (oldval), "=&r" (newval), "=&r" (tmp), "+Qo" (v->counter)
502 : "r" (&v->counter), "r" (u), "r" (a)
503 : "cc");
504
505 if (oldval != u)
506 smp_mb();
507
508 return oldval;
509}
510#define arch_atomic64_fetch_add_unless arch_atomic64_fetch_add_unless
511
512#endif /* !CONFIG_GENERIC_ATOMIC64 */
513#endif
514#endif