diff options
Diffstat (limited to 'sys/amd64/include/atomic.h')
| -rw-r--r-- | sys/amd64/include/atomic.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/sys/amd64/include/atomic.h b/sys/amd64/include/atomic.h index dc12d4d..0edbfff 100644 --- a/sys/amd64/include/atomic.h +++ b/sys/amd64/include/atomic.h @@ -74,6 +74,7 @@ void atomic_##NAME##_##TYPE(volatile u_##TYPE *p, u_##TYPE v) int atomic_cmpset_int(volatile u_int *dst, u_int exp, u_int src); int atomic_cmpset_long(volatile u_long *dst, u_long exp, u_long src); u_int atomic_fetchadd_int(volatile u_int *p, u_int v); +u_long atomic_fetchadd_long(volatile u_long *p, u_long v); #define ATOMIC_STORE_LOAD(TYPE, LOP, SOP) \ u_##TYPE atomic_load_acq_##TYPE(volatile u_##TYPE *p); \ @@ -174,6 +175,25 @@ atomic_fetchadd_int(volatile u_int *p, u_int v) return (v); } +/* + * Atomically add the value of v to the long integer pointed to by p and return + * the previous value of *p. + */ +static __inline u_long +atomic_fetchadd_long(volatile u_long *p, u_long v) +{ + + __asm __volatile( + " " MPLOCKED " " + " xaddq %0, %1 ; " + "# atomic_fetchadd_long" + : "+r" (v), /* 0 (result) */ + "=m" (*p) /* 1 */ + : "m" (*p)); /* 2 */ + + return (v); +} + #if defined(_KERNEL) && !defined(SMP) /* |
