diff options
Diffstat (limited to 'sys/i386/include/atomic.h')
| -rw-r--r-- | sys/i386/include/atomic.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/sys/i386/include/atomic.h b/sys/i386/include/atomic.h index 3242d76..90fb950 100644 --- a/sys/i386/include/atomic.h +++ b/sys/i386/include/atomic.h @@ -108,6 +108,7 @@ void atomic_##NAME##_barr_##TYPE(volatile u_##TYPE *p, u_##TYPE v) int atomic_cmpset_int(volatile u_int *dst, u_int expect, u_int src); u_int atomic_fetchadd_int(volatile u_int *p, u_int v); int atomic_testandset_int(volatile u_int *p, u_int v); +int atomic_testandclear_int(volatile u_int *p, u_int v); void atomic_thread_fence_acq(void); void atomic_thread_fence_acq_rel(void); void atomic_thread_fence_rel(void); @@ -250,6 +251,23 @@ atomic_testandset_int(volatile u_int *p, u_int v) return (res); } +static __inline int +atomic_testandclear_int(volatile u_int *p, u_int v) +{ + u_char res; + + __asm __volatile( + " " MPLOCKED " " + " btrl %2,%1 ; " + " setc %0 ; " + "# atomic_testandclear_int" + : "=q" (res), /* 0 */ + "+m" (*p) /* 1 */ + : "Ir" (v & 0x1f) /* 2 */ + : "cc"); + return (res); +} + /* * We assume that a = b will do atomic loads and stores. Due to the * IA32 memory model, a simple store guarantees release semantics. @@ -602,6 +620,13 @@ atomic_testandset_long(volatile u_long *p, u_int v) return (atomic_testandset_int((volatile u_int *)p, v)); } +static __inline int +atomic_testandclear_long(volatile u_long *p, u_int v) +{ + + return (atomic_testandclear_int((volatile u_int *)p, v)); +} + /* Read the current value and store a new value in the destination. */ #ifdef __GNUCLIKE_ASM @@ -728,6 +753,7 @@ u_long atomic_swap_long(volatile u_long *p, u_long v); #define atomic_readandclear_32 atomic_readandclear_int #define atomic_fetchadd_32 atomic_fetchadd_int #define atomic_testandset_32 atomic_testandset_int +#define atomic_testandclear_32 atomic_testandclear_int /* Operations on pointers. */ #define atomic_set_ptr(p, v) \ |
