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-rw-r--r--include/asm-m68k/atomic.h148
1 files changed, 148 insertions, 0 deletions
diff --git a/include/asm-m68k/atomic.h b/include/asm-m68k/atomic.h
new file mode 100644
index 000000000000..38f3043e7fe1
--- /dev/null
+++ b/include/asm-m68k/atomic.h
@@ -0,0 +1,148 @@
+#ifndef __ARCH_M68K_ATOMIC__
+#define __ARCH_M68K_ATOMIC__
+
+#include <linux/config.h>
+
+#include <asm/system.h> /* local_irq_XXX() */
+
+/*
+ * 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)
+{
+ __asm__ __volatile__("addl %1,%0" : "+m" (*v) : "id" (i));
+}
+
+static inline void atomic_sub(int i, atomic_t *v)
+{
+ __asm__ __volatile__("subl %1,%0" : "+m" (*v) : "id" (i));
+}
+
+static inline void atomic_inc(atomic_t *v)
+{
+ __asm__ __volatile__("addql #1,%0" : "+m" (*v));
+}
+
+static inline void atomic_dec(atomic_t *v)
+{
+ __asm__ __volatile__("subql #1,%0" : "+m" (*v));
+}
+
+static inline int atomic_dec_and_test(atomic_t *v)
+{
+ char c;
+ __asm__ __volatile__("subql #1,%1; seq %0" : "=d" (c), "+m" (*v));
+ return c != 0;
+}
+
+static inline int atomic_inc_and_test(atomic_t *v)
+{
+ char c;
+ __asm__ __volatile__("addql #1,%1; seq %0" : "=d" (c), "+m" (*v));
+ return c != 0;
+}
+
+#ifdef CONFIG_RMW_INSNS
+static inline int atomic_add_return(int i, atomic_t *v)
+{
+ int t, tmp;
+
+ __asm__ __volatile__(
+ "1: movel %2,%1\n"
+ " addl %3,%1\n"
+ " casl %2,%1,%0\n"
+ " jne 1b"
+ : "+m" (*v), "=&d" (t), "=&d" (tmp)
+ : "g" (i), "2" (atomic_read(v)));
+ return t;
+}
+
+static inline int atomic_sub_return(int i, atomic_t *v)
+{
+ int t, tmp;
+
+ __asm__ __volatile__(
+ "1: movel %2,%1\n"
+ " subl %3,%1\n"
+ " casl %2,%1,%0\n"
+ " jne 1b"
+ : "+m" (*v), "=&d" (t), "=&d" (tmp)
+ : "g" (i), "2" (atomic_read(v)));
+ return t;
+}
+#else /* !CONFIG_RMW_INSNS */
+static inline int atomic_add_return(int i, atomic_t * v)
+{
+ unsigned long flags;
+ int t;
+
+ local_irq_save(flags);
+ t = atomic_read(v);
+ t += i;
+ atomic_set(v, t);
+ local_irq_restore(flags);
+
+ return t;
+}
+
+static inline int atomic_sub_return(int i, atomic_t * v)
+{
+ unsigned long flags;
+ int t;
+
+ local_irq_save(flags);
+ t = atomic_read(v);
+ t -= i;
+ atomic_set(v, t);
+ local_irq_restore(flags);
+
+ return t;
+}
+#endif /* !CONFIG_RMW_INSNS */
+
+#define atomic_dec_return(v) atomic_sub_return(1, (v))
+#define atomic_inc_return(v) atomic_add_return(1, (v))
+
+static inline int atomic_sub_and_test(int i, atomic_t *v)
+{
+ char c;
+ __asm__ __volatile__("subl %2,%1; seq %0" : "=d" (c), "+m" (*v): "g" (i));
+ return c != 0;
+}
+
+static inline int atomic_add_negative(int i, atomic_t *v)
+{
+ char c;
+ __asm__ __volatile__("addl %2,%1; smi %0" : "=d" (c), "+m" (*v): "g" (i));
+ 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()
+
+#endif /* __ARCH_M68K_ATOMIC __ */