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-rw-r--r--include/asm-generic/atomic.h49
1 files changed, 49 insertions, 0 deletions
diff --git a/include/asm-generic/atomic.h b/include/asm-generic/atomic.h
index 449cecaabc..6e63b8e8e7 100644
--- a/include/asm-generic/atomic.h
+++ b/include/asm-generic/atomic.h
@@ -11,7 +11,55 @@
#ifdef CONFIG_SMP
#error SMP not supported
#endif
+#define ATOMIC_INIT(i) { (i) }
+
+#ifdef CONFIG_64BIT
+typedef struct { s64 counter; } atomic64_t;
+
+#define atomic64_read(v) ((v)->counter)
+#define atomic64_set(v, i) (((v)->counter) = (i))
+
+static inline void atomic64_add(s64 i, volatile atomic64_t *v)
+{
+ v->counter += i;
+}
+
+static inline void atomic64_sub(s64 i, volatile atomic64_t *v)
+{
+ v->counter -= i;
+}
+
+static inline void atomic64_inc(volatile atomic64_t *v)
+{
+ v->counter += 1;
+}
+
+static inline void atomic64_dec(volatile atomic64_t *v)
+{
+ v->counter -= 1;
+}
+
+static inline int atomic64_dec_and_test(volatile atomic64_t *v)
+{
+ s64 val;
+
+ val = v->counter;
+ v->counter = val -= 1;
+
+ return val == 0;
+}
+static inline int atomic64_add_negative(s64 i, volatile atomic64_t *v)
+{
+ s64 val;
+
+ val = v->counter;
+ v->counter = val += i;
+
+ return val < 0;
+}
+
+#else
typedef struct { volatile int counter; } atomic_t;
#define ATOMIC_INIT(i) { (i) }
@@ -63,6 +111,7 @@ static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
{
*addr &= ~mask;
}
+#endif
/* Atomic operations are already serializing on ARM */
#define smp_mb__before_atomic_dec() barrier()