From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001
From: Yuval Adam <_@yuv.al>
Date: Wed, 30 Aug 2017 08:25:59 +0000
Subject: Initial file dump from open source release

---
 arch/cris/include/asm/atomic.h | 160 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 160 insertions(+)
 create mode 100644 arch/cris/include/asm/atomic.h

(limited to 'arch/cris/include/asm/atomic.h')

diff --git a/arch/cris/include/asm/atomic.h b/arch/cris/include/asm/atomic.h
new file mode 100644
index 00000000..1056a5df
--- /dev/null
+++ b/arch/cris/include/asm/atomic.h
@@ -0,0 +1,160 @@
+/* $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 <linux/types.h>
+#include <asm/cmpxchg.h>
+#include <arch/atomic.h>
+
+/*
+ * Atomic operations that C can't guarantee us.  Useful for
+ * resource counting etc..
+ */
+
+#define ATOMIC_INIT(i)  { (i) }
+
+#define atomic_read(v) (*(volatile int *)&(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;
+}
+
+/* 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
-- 
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