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1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2014 Intel Corporation.
6 * Inspired from FreeBSD src/sys/i386/include/atomic.h
7 * Copyright (c) 1998 Doug Rabson
11 #ifndef _RTE_ATOMIC_X86_H_
12 #error do not include this file directly, use <rte_atomic.h> instead
15 #ifndef _RTE_ATOMIC_I686_H_
16 #define _RTE_ATOMIC_I686_H_
19 #include <rte_common.h>
20 #include <rte_atomic.h>
22 /*------------------------- 64 bit atomic operations -------------------------*/
24 #ifndef RTE_FORCE_INTRINSICS
26 rte_atomic64_cmpset(volatile uint64_t *dst
, uint64_t exp
, uint64_t src
)
46 : [res
] "=a" (res
) /* result in eax */
47 : [dst
] "S" (dst
), /* esi */
48 "b" (_src
.l32
), /* ebx */
49 "c" (_src
.h32
), /* ecx */
50 "a" (_exp
.l32
), /* eax */
51 "d" (_exp
.h32
) /* edx */
52 : "memory" ); /* no-clobber list */
55 "xchgl %%ebx, %%edi;\n"
59 "xchgl %%ebx, %%edi;\n"
60 : [res
] "=a" (res
) /* result in eax */
61 : [dst
] "S" (dst
), /* esi */
62 "D" (_src
.l32
), /* ebx */
63 "c" (_src
.h32
), /* ecx */
64 "a" (_exp
.l32
), /* eax */
65 "d" (_exp
.h32
) /* edx */
66 : "memory" ); /* no-clobber list */
72 static inline uint64_t
73 rte_atomic64_exchange(volatile uint64_t *dest
, uint64_t val
)
79 } while (rte_atomic64_cmpset(dest
, old
, val
) == 0);
85 rte_atomic64_init(rte_atomic64_t
*v
)
90 while (success
== 0) {
92 success
= rte_atomic64_cmpset((volatile uint64_t *)&v
->cnt
,
98 rte_atomic64_read(rte_atomic64_t
*v
)
103 while (success
== 0) {
105 /* replace the value by itself */
106 success
= rte_atomic64_cmpset((volatile uint64_t *)&v
->cnt
,
113 rte_atomic64_set(rte_atomic64_t
*v
, int64_t new_value
)
118 while (success
== 0) {
120 success
= rte_atomic64_cmpset((volatile uint64_t *)&v
->cnt
,
126 rte_atomic64_add(rte_atomic64_t
*v
, int64_t inc
)
131 while (success
== 0) {
133 success
= rte_atomic64_cmpset((volatile uint64_t *)&v
->cnt
,
139 rte_atomic64_sub(rte_atomic64_t
*v
, int64_t dec
)
144 while (success
== 0) {
146 success
= rte_atomic64_cmpset((volatile uint64_t *)&v
->cnt
,
152 rte_atomic64_inc(rte_atomic64_t
*v
)
154 rte_atomic64_add(v
, 1);
158 rte_atomic64_dec(rte_atomic64_t
*v
)
160 rte_atomic64_sub(v
, 1);
163 static inline int64_t
164 rte_atomic64_add_return(rte_atomic64_t
*v
, int64_t inc
)
169 while (success
== 0) {
171 success
= rte_atomic64_cmpset((volatile uint64_t *)&v
->cnt
,
178 static inline int64_t
179 rte_atomic64_sub_return(rte_atomic64_t
*v
, int64_t dec
)
184 while (success
== 0) {
186 success
= rte_atomic64_cmpset((volatile uint64_t *)&v
->cnt
,
193 static inline int rte_atomic64_inc_and_test(rte_atomic64_t
*v
)
195 return rte_atomic64_add_return(v
, 1) == 0;
198 static inline int rte_atomic64_dec_and_test(rte_atomic64_t
*v
)
200 return rte_atomic64_sub_return(v
, 1) == 0;
203 static inline int rte_atomic64_test_and_set(rte_atomic64_t
*v
)
205 return rte_atomic64_cmpset((volatile uint64_t *)&v
->cnt
, 0, 1);
208 static inline void rte_atomic64_clear(rte_atomic64_t
*v
)
210 rte_atomic64_set(v
, 0);
214 #endif /* _RTE_ATOMIC_I686_H_ */