1 files changed, 155 insertions, 0 deletions
diff --git a/arch/m68knommu/include/asm/atomic.h b/arch/m68knommu/include/asm/atomic.h
new file mode 100644
index 00000000000..d5632a305da
--- /dev/null
+++ b/arch/m68knommu/include/asm/atomic.h
@@ -0,0 +1,155 @@
+#ifndef __ARCH_M68KNOMMU_ATOMIC__
+#define __ARCH_M68KNOMMU_ATOMIC__
+
+#include <asm/system.h>
+
+/*
+ * Atomic operations that C can't guarantee us.  Useful for
+ * resource counting etc..
+ */
+
+/*
+ * We do not have SMP m68k systems, so we don't have to deal with that.
+ */
+
+typedef struct { int counter; } atomic_t;
+#define ATOMIC_INIT(i)	{ (i) }
+
+#define atomic_read(v)		((v)->counter)
+#define atomic_set(v, i)	(((v)->counter) = i)
+
+static __inline__ void atomic_add(int i, atomic_t *v)
+{
+#ifdef CONFIG_COLDFIRE
+	__asm__ __volatile__("addl %1,%0" : "+m" (*v) : "d" (i));
+#else
+	__asm__ __volatile__("addl %1,%0" : "+m" (*v) : "di" (i));
+#endif
+}
+
+static __inline__ void atomic_sub(int i, atomic_t *v)
+{
+#ifdef CONFIG_COLDFIRE
+	__asm__ __volatile__("subl %1,%0" : "+m" (*v) : "d" (i));
+#else
+	__asm__ __volatile__("subl %1,%0" : "+m" (*v) : "di" (i));
+#endif
+}
+
+static __inline__ int atomic_sub_and_test(int i, atomic_t * v)
+{
+	char c;
+#ifdef CONFIG_COLDFIRE
+	__asm__ __volatile__("subl %2,%1; seq %0"
+			     : "=d" (c), "+m" (*v)
+			     : "d" (i));
+#else
+	__asm__ __volatile__("subl %2,%1; seq %0"
+			     : "=d" (c), "+m" (*v)
+			     : "di" (i));
+#endif
+	return c != 0;
+}
+
+static __inline__ void atomic_inc(volatile atomic_t *v)
+{
+	__asm__ __volatile__("addql #1,%0" : "+m" (*v));
+}
+
+/*
+ * atomic_inc_and_test - increment and test
+ * @v: pointer of type atomic_t
+ *
+ * Atomically increments @v by 1
+ * and returns true if the result is zero, or false for all
+ * other cases.
+ */
+
+static __inline__ int atomic_inc_and_test(volatile atomic_t *v)
+{
+	char c;
+	__asm__ __volatile__("addql #1,%1; seq %0" : "=d" (c), "+m" (*v));
+	return c != 0;
+}
+
+static __inline__ void atomic_dec(volatile atomic_t *v)
+{
+	__asm__ __volatile__("subql #1,%0" : "+m" (*v));
+}
+
+static __inline__ int atomic_dec_and_test(volatile atomic_t *v)
+{
+	char c;
+	__asm__ __volatile__("subql #1,%1; seq %0" : "=d" (c), "+m" (*v));
+	return c != 0;
+}
+
+static __inline__ void atomic_clear_mask(unsigned long mask, unsigned long *v)
+{
+	__asm__ __volatile__("andl %1,%0" : "+m" (*v) : "id" (~(mask)));
+}
+
+static __inline__ void atomic_set_mask(unsigned long mask, unsigned long *v)
+{
+	__asm__ __volatile__("orl %1,%0" : "+m" (*v) : "id" (mask));
+}
+
+/* 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()
+
+static inline int atomic_add_return(int i, atomic_t * v)
+{
+	unsigned long temp, flags;
+
+	local_irq_save(flags);
+	temp = *(long *)v;
+	temp += i;
+	*(long *)v = temp;
+	local_irq_restore(flags);
+
+	return temp;
+}
+
+#define atomic_add_negative(a, v)	(atomic_add_return((a), (v)) < 0)
+
+static inline int atomic_sub_return(int i, atomic_t * v)
+{
+	unsigned long temp, flags;
+
+	local_irq_save(flags);
+	temp = *(long *)v;
+	temp -= i;
+	*(long *)v = temp;
+	local_irq_restore(flags);
+
+	return temp;
+}
+
+#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+
+static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
+{
+	int c, old;
+	c = atomic_read(v);
+	for (;;) {
+		if (unlikely(c == (u)))
+			break;
+		old = atomic_cmpxchg((v), c, c + (a));
+		if (likely(old == c))
+			break;
+		c = old;
+	}
+	return c != (u);
+}
+
+#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
+
+#define atomic_dec_return(v) atomic_sub_return(1,(v))
+#define atomic_inc_return(v) atomic_add_return(1,(v))
+
+#include <asm-generic/atomic.h>
+#endif /* __ARCH_M68KNOMMU_ATOMIC __ */