4 * Copyright (C) IBM Corporation 2014.
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20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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23 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
24 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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30 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 * Inspired from FreeBSD src/sys/powerpc/include/atomic.h
35 * Copyright (c) 2008 Marcel Moolenaar
36 * Copyright (c) 2001 Benno Rice
37 * Copyright (c) 2001 David E. O'Brien
38 * Copyright (c) 1998 Doug Rabson
39 * All rights reserved.
42 #ifndef _RTE_ATOMIC_PPC_64_H_
43 #define _RTE_ATOMIC_PPC_64_H_
49 #include "generic/rte_atomic.h"
52 * General memory barrier.
54 * Guarantees that the LOAD and STORE operations generated before the
55 * barrier occur before the LOAD and STORE operations generated after.
57 #define rte_mb() {asm volatile("sync" : : : "memory"); }
60 * Write memory barrier.
62 * Guarantees that the STORE operations generated before the barrier
63 * occur before the STORE operations generated after.
66 #define rte_wmb() {asm volatile("lwsync" : : : "memory"); }
68 #define rte_wmb() {asm volatile("sync" : : : "memory"); }
72 * Read memory barrier.
74 * Guarantees that the LOAD operations generated before the barrier
75 * occur before the LOAD operations generated after.
78 #define rte_rmb() {asm volatile("lwsync" : : : "memory"); }
80 #define rte_rmb() {asm volatile("sync" : : : "memory"); }
83 #define rte_smp_mb() rte_mb()
85 #define rte_smp_wmb() rte_wmb()
87 #define rte_smp_rmb() rte_rmb()
89 /*------------------------- 16 bit atomic operations -------------------------*/
90 /* To be compatible with Power7, use GCC built-in functions for 16 bit
93 #ifndef RTE_FORCE_INTRINSICS
95 rte_atomic16_cmpset(volatile uint16_t *dst, uint16_t exp, uint16_t src)
97 return __atomic_compare_exchange(dst, &exp, &src, 0, __ATOMIC_ACQUIRE,
98 __ATOMIC_ACQUIRE) ? 1 : 0;
101 static inline int rte_atomic16_test_and_set(rte_atomic16_t *v)
103 return rte_atomic16_cmpset((volatile uint16_t *)&v->cnt, 0, 1);
107 rte_atomic16_inc(rte_atomic16_t *v)
109 __atomic_add_fetch(&v->cnt, 1, __ATOMIC_ACQUIRE);
113 rte_atomic16_dec(rte_atomic16_t *v)
115 __atomic_sub_fetch(&v->cnt, 1, __ATOMIC_ACQUIRE);
118 static inline int rte_atomic16_inc_and_test(rte_atomic16_t *v)
120 return __atomic_add_fetch(&v->cnt, 1, __ATOMIC_ACQUIRE) == 0;
123 static inline int rte_atomic16_dec_and_test(rte_atomic16_t *v)
125 return __atomic_sub_fetch(&v->cnt, 1, __ATOMIC_ACQUIRE) == 0;
128 /*------------------------- 32 bit atomic operations -------------------------*/
131 rte_atomic32_cmpset(volatile uint32_t *dst, uint32_t exp, uint32_t src)
133 unsigned int ret = 0;
137 "1:\tlwarx %[ret], 0, %[dst]\n"
138 "cmplw %[exp], %[ret]\n"
140 "stwcx. %[src], 0, %[dst]\n"
145 "stwcx. %[ret], 0, %[dst]\n"
149 : [ret] "=&r" (ret), "=m" (*dst)
159 static inline int rte_atomic32_test_and_set(rte_atomic32_t *v)
161 return rte_atomic32_cmpset((volatile uint32_t *)&v->cnt, 0, 1);
165 rte_atomic32_inc(rte_atomic32_t *v)
170 "1: lwarx %[t],0,%[cnt]\n"
171 "addic %[t],%[t],1\n"
172 "stwcx. %[t],0,%[cnt]\n"
174 : [t] "=&r" (t), "=m" (v->cnt)
175 : [cnt] "r" (&v->cnt), "m" (v->cnt)
176 : "cc", "xer", "memory");
180 rte_atomic32_dec(rte_atomic32_t *v)
185 "1: lwarx %[t],0,%[cnt]\n"
186 "addic %[t],%[t],-1\n"
187 "stwcx. %[t],0,%[cnt]\n"
189 : [t] "=&r" (t), "=m" (v->cnt)
190 : [cnt] "r" (&v->cnt), "m" (v->cnt)
191 : "cc", "xer", "memory");
194 static inline int rte_atomic32_inc_and_test(rte_atomic32_t *v)
200 "1: lwarx %[ret],0,%[cnt]\n"
201 "addic %[ret],%[ret],1\n"
202 "stwcx. %[ret],0,%[cnt]\n"
206 : [cnt] "r" (&v->cnt)
207 : "cc", "xer", "memory");
212 static inline int rte_atomic32_dec_and_test(rte_atomic32_t *v)
218 "1: lwarx %[ret],0,%[cnt]\n"
219 "addic %[ret],%[ret],-1\n"
220 "stwcx. %[ret],0,%[cnt]\n"
224 : [cnt] "r" (&v->cnt)
225 : "cc", "xer", "memory");
229 /*------------------------- 64 bit atomic operations -------------------------*/
232 rte_atomic64_cmpset(volatile uint64_t *dst, uint64_t exp, uint64_t src)
234 unsigned int ret = 0;
238 "1: ldarx %[ret], 0, %[dst]\n"
239 "cmpld %[exp], %[ret]\n"
241 "stdcx. %[src], 0, %[dst]\n"
246 "stdcx. %[ret], 0, %[dst]\n"
250 : [ret] "=&r" (ret), "=m" (*dst)
260 rte_atomic64_init(rte_atomic64_t *v)
265 static inline int64_t
266 rte_atomic64_read(rte_atomic64_t *v)
270 asm volatile("ld%U1%X1 %[ret],%[cnt]"
272 : [cnt] "m"(v->cnt));
278 rte_atomic64_set(rte_atomic64_t *v, int64_t new_value)
280 asm volatile("std%U0%X0 %[new_value],%[cnt]"
282 : [new_value] "r"(new_value));
286 rte_atomic64_add(rte_atomic64_t *v, int64_t inc)
291 "1: ldarx %[t],0,%[cnt]\n"
292 "add %[t],%[inc],%[t]\n"
293 "stdcx. %[t],0,%[cnt]\n"
295 : [t] "=&r" (t), "=m" (v->cnt)
296 : [cnt] "r" (&v->cnt), [inc] "r" (inc), "m" (v->cnt)
301 rte_atomic64_sub(rte_atomic64_t *v, int64_t dec)
306 "1: ldarx %[t],0,%[cnt]\n"
307 "subf %[t],%[dec],%[t]\n"
308 "stdcx. %[t],0,%[cnt]\n"
310 : [t] "=&r" (t), "+m" (v->cnt)
311 : [cnt] "r" (&v->cnt), [dec] "r" (dec), "m" (v->cnt)
316 rte_atomic64_inc(rte_atomic64_t *v)
321 "1: ldarx %[t],0,%[cnt]\n"
322 "addic %[t],%[t],1\n"
323 "stdcx. %[t],0,%[cnt]\n"
325 : [t] "=&r" (t), "+m" (v->cnt)
326 : [cnt] "r" (&v->cnt), "m" (v->cnt)
327 : "cc", "xer", "memory");
331 rte_atomic64_dec(rte_atomic64_t *v)
336 "1: ldarx %[t],0,%[cnt]\n"
337 "addic %[t],%[t],-1\n"
338 "stdcx. %[t],0,%[cnt]\n"
340 : [t] "=&r" (t), "+m" (v->cnt)
341 : [cnt] "r" (&v->cnt), "m" (v->cnt)
342 : "cc", "xer", "memory");
345 static inline int64_t
346 rte_atomic64_add_return(rte_atomic64_t *v, int64_t inc)
352 "1: ldarx %[ret],0,%[cnt]\n"
353 "add %[ret],%[inc],%[ret]\n"
354 "stdcx. %[ret],0,%[cnt]\n"
358 : [inc] "r" (inc), [cnt] "r" (&v->cnt)
364 static inline int64_t
365 rte_atomic64_sub_return(rte_atomic64_t *v, int64_t dec)
371 "1: ldarx %[ret],0,%[cnt]\n"
372 "subf %[ret],%[dec],%[ret]\n"
373 "stdcx. %[ret],0,%[cnt]\n"
377 : [dec] "r" (dec), [cnt] "r" (&v->cnt)
383 static inline int rte_atomic64_inc_and_test(rte_atomic64_t *v)
389 "1: ldarx %[ret],0,%[cnt]\n"
390 "addic %[ret],%[ret],1\n"
391 "stdcx. %[ret],0,%[cnt]\n"
395 : [cnt] "r" (&v->cnt)
396 : "cc", "xer", "memory");
401 static inline int rte_atomic64_dec_and_test(rte_atomic64_t *v)
407 "1: ldarx %[ret],0,%[cnt]\n"
408 "addic %[ret],%[ret],-1\n"
409 "stdcx. %[ret],0,%[cnt]\n"
413 : [cnt] "r" (&v->cnt)
414 : "cc", "xer", "memory");
419 static inline int rte_atomic64_test_and_set(rte_atomic64_t *v)
421 return rte_atomic64_cmpset((volatile uint64_t *)&v->cnt, 0, 1);
425 * Atomically set a 64-bit counter to 0.
428 * A pointer to the atomic counter.
430 static inline void rte_atomic64_clear(rte_atomic64_t *v)
440 #endif /* _RTE_ATOMIC_PPC_64_H_ */