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authorLinus Torvalds <torvalds@linux-foundation.org>2008-08-13 14:26:22 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-08-13 14:26:32 -0700
commit758db3f2118703a1e36374dae5d58bed963e7e0d (patch)
tree12546f52718d903a8cc8fd70abdcd4b2e6826e94 /arch/h8300/include/asm/atomic.h
parent30a2f3c60a84092c8084dfe788b710f8d0768cd4 (diff)
[h8300] move include/asm-h8300 to arch/h8300/include/asm
Done as a script (well, a single "git mv" actually) on request from Yoshinori Sato as a way to avoid a huge diff. Requested-by: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/h8300/include/asm/atomic.h')
-rw-r--r--arch/h8300/include/asm/atomic.h144
1 files changed, 144 insertions, 0 deletions
diff --git a/arch/h8300/include/asm/atomic.h b/arch/h8300/include/asm/atomic.h
new file mode 100644
index 000000000000..b4cf0ea97ede
--- /dev/null
+++ b/arch/h8300/include/asm/atomic.h
@@ -0,0 +1,144 @@
+#ifndef __ARCH_H8300_ATOMIC__
+#define __ARCH_H8300_ATOMIC__
+
+/*
+ * Atomic operations that C can't guarantee us. Useful for
+ * resource counting etc..
+ */
+
+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)
+
+#include <asm/system.h>
+#include <linux/kernel.h>
+
+static __inline__ int atomic_add_return(int i, atomic_t *v)
+{
+ int ret,flags;
+ local_irq_save(flags);
+ ret = v->counter += i;
+ 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)
+{
+ int ret,flags;
+ local_irq_save(flags);
+ ret = v->counter -= i;
+ 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)
+{
+ int ret,flags;
+ local_irq_save(flags);
+ v->counter++;
+ ret = v->counter;
+ 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)
+{
+ int ret,flags;
+ local_irq_save(flags);
+ --v->counter;
+ ret = v->counter;
+ local_irq_restore(flags);
+ return ret;
+}
+
+#define atomic_dec(v) atomic_dec_return(v)
+
+static __inline__ int atomic_dec_and_test(atomic_t *v)
+{
+ int ret,flags;
+ local_irq_save(flags);
+ --v->counter;
+ ret = v->counter;
+ local_irq_restore(flags);
+ return ret == 0;
+}
+
+static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
+{
+ int ret;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ ret = v->counter;
+ if (likely(ret == old))
+ v->counter = new;
+ local_irq_restore(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;
+
+ local_irq_save(flags);
+ ret = v->counter;
+ if (ret != u)
+ v->counter += a;
+ local_irq_restore(flags);
+ return ret != u;
+}
+#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
+
+static __inline__ void atomic_clear_mask(unsigned long mask, unsigned long *v)
+{
+ __asm__ __volatile__("stc ccr,r1l\n\t"
+ "orc #0x80,ccr\n\t"
+ "mov.l %0,er0\n\t"
+ "and.l %1,er0\n\t"
+ "mov.l er0,%0\n\t"
+ "ldc r1l,ccr"
+ : "=m" (*v) : "g" (~(mask)) :"er0","er1");
+}
+
+static __inline__ void atomic_set_mask(unsigned long mask, unsigned long *v)
+{
+ __asm__ __volatile__("stc ccr,r1l\n\t"
+ "orc #0x80,ccr\n\t"
+ "mov.l %0,er0\n\t"
+ "or.l %1,er0\n\t"
+ "mov.l er0,%0\n\t"
+ "ldc r1l,ccr"
+ : "=m" (*v) : "g" (mask) :"er0","er1");
+}
+
+/* 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 /* __ARCH_H8300_ATOMIC __ */

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