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35 * Inspired from FreeBSD src/sys/i386/include/atomic.h
36 * Copyright (c) 1998 Doug Rabson
37 * All rights reserved.
40 #ifndef _RTE_ATOMIC_I686_H_
41 #define _RTE_ATOMIC_I686_H_
43 #include <rte_common.h>
45 /*------------------------- 64 bit atomic operations -------------------------*/
47 #ifndef RTE_FORCE_INTRINSICS
49 rte_atomic64_cmpset(volatile uint64_t *dst, uint64_t exp, uint64_t src)
69 : [res] "=a" (res) /* result in eax */
70 : [dst] "S" (dst), /* esi */
71 "b" (_src.l32), /* ebx */
72 "c" (_src.h32), /* ecx */
73 "a" (_exp.l32), /* eax */
74 "d" (_exp.h32) /* edx */
75 : "memory" ); /* no-clobber list */
82 "xchgl %%ebx, %%edi;\n"
83 : [res] "=a" (res) /* result in eax */
84 : [dst] "S" (dst), /* esi */
85 "D" (_src.l32), /* ebx */
86 "c" (_src.h32), /* ecx */
87 "a" (_exp.l32), /* eax */
88 "d" (_exp.h32) /* edx */
89 : "memory" ); /* no-clobber list */
96 rte_atomic64_init(rte_atomic64_t *v)
101 while (success == 0) {
103 success = rte_atomic64_cmpset((volatile uint64_t *)&v->cnt,
108 static inline int64_t
109 rte_atomic64_read(rte_atomic64_t *v)
114 while (success == 0) {
116 /* replace the value by itself */
117 success = rte_atomic64_cmpset((volatile uint64_t *)&v->cnt,
124 rte_atomic64_set(rte_atomic64_t *v, int64_t new_value)
129 while (success == 0) {
131 success = rte_atomic64_cmpset((volatile uint64_t *)&v->cnt,
137 rte_atomic64_add(rte_atomic64_t *v, int64_t inc)
142 while (success == 0) {
144 success = rte_atomic64_cmpset((volatile uint64_t *)&v->cnt,
150 rte_atomic64_sub(rte_atomic64_t *v, int64_t dec)
155 while (success == 0) {
157 success = rte_atomic64_cmpset((volatile uint64_t *)&v->cnt,
163 rte_atomic64_inc(rte_atomic64_t *v)
165 rte_atomic64_add(v, 1);
169 rte_atomic64_dec(rte_atomic64_t *v)
171 rte_atomic64_sub(v, 1);
174 static inline int64_t
175 rte_atomic64_add_return(rte_atomic64_t *v, int64_t inc)
180 while (success == 0) {
182 success = rte_atomic64_cmpset((volatile uint64_t *)&v->cnt,
189 static inline int64_t
190 rte_atomic64_sub_return(rte_atomic64_t *v, int64_t dec)
195 while (success == 0) {
197 success = rte_atomic64_cmpset((volatile uint64_t *)&v->cnt,
204 static inline int rte_atomic64_inc_and_test(rte_atomic64_t *v)
206 return rte_atomic64_add_return(v, 1) == 0;
209 static inline int rte_atomic64_dec_and_test(rte_atomic64_t *v)
211 return rte_atomic64_sub_return(v, 1) == 0;
214 static inline int rte_atomic64_test_and_set(rte_atomic64_t *v)
216 return rte_atomic64_cmpset((volatile uint64_t *)&v->cnt, 0, 1);
219 static inline void rte_atomic64_clear(rte_atomic64_t *v)
221 rte_atomic64_set(v, 0);
225 #endif /* _RTE_ATOMIC_I686_H_ */