1 files changed, 164 insertions, 0 deletions

diff --git a/arch/cris/include/asm/atomic.h b/arch/cris/include/asm/atomic.h
new file mode 100644
index 000000000000..f71ea686a2ea
--- /dev/null
+++ b/arch/cris/include/asm/atomic.h
@@ -0,0 +1,164 @@
+/* $Id: atomic.h,v 1.3 2001/07/25 16:15:19 bjornw Exp $ */
+
+#ifndef __ASM_CRIS_ATOMIC__
+#define __ASM_CRIS_ATOMIC__
+
+#include <linux/compiler.h>
+
+#include <asm/system.h>
+#include <arch/atomic.h>
+
+/*
+ * Atomic operations that C can't guarantee us.  Useful for
+ * resource counting etc..
+ */
+
+typedef struct { volatile int counter; } atomic_t;
+
+#define ATOMIC_INIT(i)  { (i) }
+
+#define atomic_read(v) ((v)->counter)
+#define atomic_set(v,i) (((v)->counter) = (i))
+
+/* These should be written in asm but we do it in C for now. */
+
+static inline void atomic_add(int i, volatile atomic_t *v)
+{
+        unsigned long flags;
+        cris_atomic_save(v, flags);
+        v->counter += i;
+        cris_atomic_restore(v, flags);
+}
+
+static inline void atomic_sub(int i, volatile atomic_t *v)
+{
+        unsigned long flags;
+        cris_atomic_save(v, flags);
+        v->counter -= i;
+        cris_atomic_restore(v, flags);
+}
+
+static inline int atomic_add_return(int i, volatile atomic_t *v)
+{
+        unsigned long flags;
+        int retval;
+        cris_atomic_save(v, flags);
+        retval = (v->counter += i);
+        cris_atomic_restore(v, flags);
+        return retval;
+}
+
+#define atomic_add_negative(a, v)       (atomic_add_return((a), (v)) < 0)
+
+static inline int atomic_sub_return(int i, volatile atomic_t *v)
+{
+        unsigned long flags;
+        int retval;
+        cris_atomic_save(v, flags);
+        retval = (v->counter -= i);
+        cris_atomic_restore(v, flags);
+        return retval;
+}
+
+static inline int atomic_sub_and_test(int i, volatile atomic_t *v)
+{
+        int retval;
+        unsigned long flags;
+        cris_atomic_save(v, flags);
+        retval = (v->counter -= i) == 0;
+        cris_atomic_restore(v, flags);
+        return retval;
+}
+
+static inline void atomic_inc(volatile atomic_t *v)
+{
+        unsigned long flags;
+        cris_atomic_save(v, flags);
+        (v->counter)++;
+        cris_atomic_restore(v, flags);
+}
+
+static inline void atomic_dec(volatile atomic_t *v)
+{
+        unsigned long flags;
+        cris_atomic_save(v, flags);
+        (v->counter)--;
+        cris_atomic_restore(v, flags);
+}
+
+static inline int atomic_inc_return(volatile atomic_t *v)
+{
+        unsigned long flags;
+        int retval;
+        cris_atomic_save(v, flags);
+        retval = ++(v->counter);
+        cris_atomic_restore(v, flags);
+        return retval;
+}
+
+static inline int atomic_dec_return(volatile atomic_t *v)
+{
+        unsigned long flags;
+        int retval;
+        cris_atomic_save(v, flags);
+        retval = --(v->counter);
+        cris_atomic_restore(v, flags);
+        return retval;
+}
+static inline int atomic_dec_and_test(volatile atomic_t *v)
+{
+        int retval;
+        unsigned long flags;
+        cris_atomic_save(v, flags);
+        retval = --(v->counter) == 0;
+        cris_atomic_restore(v, flags);
+        return retval;
+}
+
+static inline int atomic_inc_and_test(volatile atomic_t *v)
+{
+        int retval;
+        unsigned long flags;
+        cris_atomic_save(v, flags);
+        retval = ++(v->counter) == 0;
+        cris_atomic_restore(v, flags);
+        return retval;
+}
+
+static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
+{
+        int ret;
+        unsigned long flags;
+
+        cris_atomic_save(v, flags);
+        ret = v->counter;
+        if (likely(ret == old))
+                v->counter = new;
+        cris_atomic_restore(v, flags);
+        return ret;
+}
+
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+
+static inline int atomic_add_unless(atomic_t *v, int a, int u)
+{
+        int ret;
+        unsigned long flags;
+
+        cris_atomic_save(v, flags);
+        ret = v->counter;
+        if (ret != u)
+                v->counter += a;
+        cris_atomic_restore(v, flags);
+        return ret != u;
+}
+#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
+
+/* Atomic operations are already serializing */
+#define smp_mb__before_atomic_dec()    barrier()
+#define smp_mb__after_atomic_dec()     barrier()
+#define smp_mb__before_atomic_inc()    barrier()
+#define smp_mb__after_atomic_inc()     barrier()
+
+#include <asm-generic/atomic.h>
+#endif