h8300: Assembly headers

Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>

arch/h8300/include/asm/atomic.h

@@ -0,0 +1,159 @@
+#ifndef __ARCH_H8300_ATOMIC__
+#define __ARCH_H8300_ATOMIC__
+
+#include <linux/types.h>
+#include <asm/cmpxchg.h>
+
+/*
+ * Atomic operations that C can't guarantee us.  Useful for
+ * resource counting etc..
+ */
+
+#define ATOMIC_INIT(i)	{ (i) }
+
+#define atomic_read(v)		ACCESS_ONCE((v)->counter)
+#define atomic_set(v, i)	(((v)->counter) = i)
+
+#include <linux/kernel.h>
+
+static inline int atomic_add_return(int i, atomic_t *v)
+{
+	h8300flags flags;
+	int ret;
+
+	flags = arch_local_irq_save();
+	ret = v->counter += i;
+	arch_local_irq_restore(flags);
+	return ret;
+}
+
+#define atomic_add(i, v) atomic_add_return(i, v)
+#define atomic_add_negative(a, v)	(atomic_add_return((a), (v)) < 0)
+
+static inline int atomic_sub_return(int i, atomic_t *v)
+{
+	h8300flags flags;
+	int ret;
+
+	flags = arch_local_irq_save();
+	ret = v->counter -= i;
+	arch_local_irq_restore(flags);
+	return ret;
+}
+
+#define atomic_sub(i, v) atomic_sub_return(i, v)
+#define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0)
+
+static inline int atomic_inc_return(atomic_t *v)
+{
+	h8300flags flags;
+	int ret;
+
+	flags = arch_local_irq_save();
+	v->counter++;
+	ret = v->counter;
+	arch_local_irq_restore(flags);
+	return ret;
+}
+
+#define atomic_inc(v) atomic_inc_return(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.
+ */
+#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
+
+static inline int atomic_dec_return(atomic_t *v)
+{
+	h8300flags flags;
+	int ret;
+
+	flags = arch_local_irq_save();
+	--v->counter;
+	ret = v->counter;
+	arch_local_irq_restore(flags);
+	return ret;
+}
+
+#define atomic_dec(v) atomic_dec_return(v)
+
+static inline int atomic_dec_and_test(atomic_t *v)
+{
+	h8300flags flags;
+	int ret;
+
+	flags = arch_local_irq_save();
+	--v->counter;
+	ret = v->counter;
+	arch_local_irq_restore(flags);
+	return ret == 0;
+}
+
+static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
+{
+	int ret;
+	h8300flags flags;
+
+	flags = arch_local_irq_save();
+	ret = v->counter;
+	if (likely(ret == old))
+		v->counter = new;
+	arch_local_irq_restore(flags);
+	return ret;
+}
+
+static inline int __atomic_add_unless(atomic_t *v, int a, int u)
+{
+	int ret;
+	h8300flags flags;
+
+	flags = arch_local_irq_save();
+	ret = v->counter;
+	if (ret != u)
+		v->counter += a;
+	arch_local_irq_restore(flags);
+	return ret;
+}
+
+static inline void atomic_clear_mask(unsigned long mask, unsigned long *v)
+{
+	unsigned char ccr;
+	unsigned long tmp;
+
+	__asm__ __volatile__("stc ccr,%w3\n\t"
+			     "orc #0x80,ccr\n\t"
+			     "mov.l %0,%1\n\t"
+			     "and.l %2,%1\n\t"
+			     "mov.l %1,%0\n\t"
+			     "ldc %w3,ccr"
+			     : "=m"(*v), "=r"(tmp)
+			     : "g"(~(mask)), "r"(ccr));
+}
+
+static inline void atomic_set_mask(unsigned long mask, unsigned long *v)
+{
+	unsigned char ccr;
+	unsigned long tmp;
+
+	__asm__ __volatile__("stc ccr,%w3\n\t"
+			     "orc #0x80,ccr\n\t"
+			     "mov.l %0,%1\n\t"
+			     "or.l %2,%1\n\t"
+			     "mov.l %1,%0\n\t"
+			     "ldc %w3,ccr"
+			     : "=m"(*v), "=r"(tmp)
+			     : "g"(~(mask)), "r"(ccr));
+}
+
+/* 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()
+
+#endif /* __ARCH_H8300_ATOMIC __ */