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| author | sephe <sephe@FreeBSD.org> | 2016-05-16 07:19:33 +0000 |
|---|---|---|
| committer | sephe <sephe@FreeBSD.org> | 2016-05-16 07:19:33 +0000 |
| commit | 6babf965828710aa3c7eb1948adf394eec4601b1 (patch) | |
| tree | 9f6d7e8698ecfb3feae93b6fe79b6d8f9f7ca071 /sys/amd64 | |
| parent | 418cf336012cc2640bff1cb21b871fe144513730 (diff) | |
| download | FreeBSD-src-6babf965828710aa3c7eb1948adf394eec4601b1.zip FreeBSD-src-6babf965828710aa3c7eb1948adf394eec4601b1.tar.gz | |
atomic: Add testandclear on i386/amd64
Reviewed by: kib
Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D6381
Diffstat (limited to 'sys/amd64')
| -rw-r--r-- | sys/amd64/include/atomic.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/sys/amd64/include/atomic.h b/sys/amd64/include/atomic.h index dd71e92..c9526f4 100644 --- a/sys/amd64/include/atomic.h +++ b/sys/amd64/include/atomic.h @@ -103,6 +103,8 @@ u_int atomic_fetchadd_int(volatile u_int *p, u_int v); u_long atomic_fetchadd_long(volatile u_long *p, u_long v); int atomic_testandset_int(volatile u_int *p, u_int v); int atomic_testandset_long(volatile u_long *p, u_int v); +int atomic_testandclear_int(volatile u_int *p, u_int v); +int atomic_testandclear_long(volatile u_long *p, u_int v); void atomic_thread_fence_acq(void); void atomic_thread_fence_acq_rel(void); void atomic_thread_fence_rel(void); @@ -264,6 +266,40 @@ atomic_testandset_long(volatile u_long *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); +} + +static __inline int +atomic_testandclear_long(volatile u_long *p, u_int v) +{ + u_char res; + + __asm __volatile( + " " MPLOCKED " " + " btrq %2,%1 ; " + " setc %0 ; " + "# atomic_testandclear_long" + : "=q" (res), /* 0 */ + "+m" (*p) /* 1 */ + : "Jr" ((u_long)(v & 0x3f)) /* 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. @@ -537,6 +573,7 @@ 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 64-bit quad words. */ #define atomic_set_64 atomic_set_long @@ -560,6 +597,7 @@ u_long atomic_swap_long(volatile u_long *p, u_long v); #define atomic_readandclear_64 atomic_readandclear_long #define atomic_fetchadd_64 atomic_fetchadd_long #define atomic_testandset_64 atomic_testandset_long +#define atomic_testandclear_64 atomic_testandclear_long /* Operations on pointers. */ #define atomic_set_ptr atomic_set_long |
