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-rw-r--r--sys/i386/include/atomic.h26
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) \
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