1 files changed, 235 insertions, 0 deletions
diff --git a/arch/parisc/include/asm/atomic.h b/arch/parisc/include/asm/atomic.h
new file mode 100644
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+++ b/arch/parisc/include/asm/atomic.h
@@ -0,0 +1,235 @@
+/* Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
+ * Copyright (C) 2006 Kyle McMartin <kyle@parisc-linux.org>
+ */
+
+#ifndef _ASM_PARISC_ATOMIC_H_
+#define _ASM_PARISC_ATOMIC_H_
+
+#include <linux/types.h>
+#include <asm/cmpxchg.h>
+
+/*
+ * Atomic operations that C can't guarantee us.  Useful for
+ * resource counting etc..
+ *
+ * And probably incredibly slow on parisc.  OTOH, we don't
+ * have to write any serious assembly.   prumpf
+ */
+
+#ifdef CONFIG_SMP
+#include <asm/spinlock.h>
+#include <asm/cache.h>		/* we use L1_CACHE_BYTES */
+
+/* Use an array of spinlocks for our atomic_ts.
+ * Hash function to index into a different SPINLOCK.
+ * Since "a" is usually an address, use one spinlock per cacheline.
+ */
+#  define ATOMIC_HASH_SIZE 4
+#  define ATOMIC_HASH(a) (&(__atomic_hash[ (((unsigned long) (a))/L1_CACHE_BYTES) & (ATOMIC_HASH_SIZE-1) ]))
+
+extern arch_spinlock_t __atomic_hash[ATOMIC_HASH_SIZE] __lock_aligned;
+
+/* Can't use raw_spin_lock_irq because of #include problems, so
+ * this is the substitute */
+#define _atomic_spin_lock_irqsave(l,f) do {	\
+	arch_spinlock_t *s = ATOMIC_HASH(l);		\
+	local_irq_save(f);			\
+	arch_spin_lock(s);			\
+} while(0)
+
+#define _atomic_spin_unlock_irqrestore(l,f) do {	\
+	arch_spinlock_t *s = ATOMIC_HASH(l);			\
+	arch_spin_unlock(s);				\
+	local_irq_restore(f);				\
+} while(0)
+
+
+#else
+#  define _atomic_spin_lock_irqsave(l,f) do { local_irq_save(f); } while (0)
+#  define _atomic_spin_unlock_irqrestore(l,f) do { local_irq_restore(f); } while (0)
+#endif
+
+/*
+ * Note that we need not lock read accesses - aligned word writes/reads
+ * are atomic, so a reader never sees inconsistent values.
+ */
+
+/* It's possible to reduce all atomic operations to either
+ * __atomic_add_return, atomic_set and atomic_read (the latter
+ * is there only for consistency).
+ */
+
+static __inline__ int __atomic_add_return(int i, atomic_t *v)
+{
+	int ret;
+	unsigned long flags;
+	_atomic_spin_lock_irqsave(v, flags);
+
+	ret = (v->counter += i);
+
+	_atomic_spin_unlock_irqrestore(v, flags);
+	return ret;
+}
+
+static __inline__ void atomic_set(atomic_t *v, int i) 
+{
+	unsigned long flags;
+	_atomic_spin_lock_irqsave(v, flags);
+
+	v->counter = i;
+
+	_atomic_spin_unlock_irqrestore(v, flags);
+}
+
+static __inline__ int atomic_read(const atomic_t *v)
+{
+	return (*(volatile int *)&(v)->counter);
+}
+
+/* exported interface */
+#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+
+/**
+ * __atomic_add_unless - add unless the number is a given value
+ * @v: pointer of type atomic_t
+ * @a: the amount to add to v...
+ * @u: ...unless v is equal to u.
+ *
+ * Atomically adds @a to @v, so long as it was not @u.
+ * Returns the old value of @v.
+ */
+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;
+}
+
+
+#define atomic_add(i,v)	((void)(__atomic_add_return( (i),(v))))
+#define atomic_sub(i,v)	((void)(__atomic_add_return(-(i),(v))))
+#define atomic_inc(v)	((void)(__atomic_add_return(   1,(v))))
+#define atomic_dec(v)	((void)(__atomic_add_return(  -1,(v))))
+
+#define atomic_add_return(i,v)	(__atomic_add_return( (i),(v)))
+#define atomic_sub_return(i,v)	(__atomic_add_return(-(i),(v)))
+#define atomic_inc_return(v)	(__atomic_add_return(   1,(v)))
+#define atomic_dec_return(v)	(__atomic_add_return(  -1,(v)))
+
+#define atomic_add_negative(a, v)	(atomic_add_return((a), (v)) < 0)
+
+/*
+ * 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)
+
+#define atomic_dec_and_test(v)	(atomic_dec_return(v) == 0)
+
+#define atomic_sub_and_test(i,v)	(atomic_sub_return((i),(v)) == 0)
+
+#define ATOMIC_INIT(i)	((atomic_t) { (i) })
+
+#define smp_mb__before_atomic_dec()	smp_mb()
+#define smp_mb__after_atomic_dec()	smp_mb()
+#define smp_mb__before_atomic_inc()	smp_mb()
+#define smp_mb__after_atomic_inc()	smp_mb()
+
+#ifdef CONFIG_64BIT
+
+#define ATOMIC64_INIT(i) ((atomic64_t) { (i) })
+
+static __inline__ s64
+__atomic64_add_return(s64 i, atomic64_t *v)
+{
+	s64 ret;
+	unsigned long flags;
+	_atomic_spin_lock_irqsave(v, flags);
+
+	ret = (v->counter += i);
+
+	_atomic_spin_unlock_irqrestore(v, flags);
+	return ret;
+}
+
+static __inline__ void
+atomic64_set(atomic64_t *v, s64 i)
+{
+	unsigned long flags;
+	_atomic_spin_lock_irqsave(v, flags);
+
+	v->counter = i;
+
+	_atomic_spin_unlock_irqrestore(v, flags);
+}
+
+static __inline__ s64
+atomic64_read(const atomic64_t *v)
+{
+	return (*(volatile long *)&(v)->counter);
+}
+
+#define atomic64_add(i,v)	((void)(__atomic64_add_return( ((s64)(i)),(v))))
+#define atomic64_sub(i,v)	((void)(__atomic64_add_return(-((s64)(i)),(v))))
+#define atomic64_inc(v)		((void)(__atomic64_add_return(   1,(v))))
+#define atomic64_dec(v)		((void)(__atomic64_add_return(  -1,(v))))
+
+#define atomic64_add_return(i,v)	(__atomic64_add_return( ((s64)(i)),(v)))
+#define atomic64_sub_return(i,v)	(__atomic64_add_return(-((s64)(i)),(v)))
+#define atomic64_inc_return(v)		(__atomic64_add_return(   1,(v)))
+#define atomic64_dec_return(v)		(__atomic64_add_return(  -1,(v)))
+
+#define atomic64_add_negative(a, v)	(atomic64_add_return((a), (v)) < 0)
+
+#define atomic64_inc_and_test(v) 	(atomic64_inc_return(v) == 0)
+#define atomic64_dec_and_test(v)	(atomic64_dec_return(v) == 0)
+#define atomic64_sub_and_test(i,v)	(atomic64_sub_return((i),(v)) == 0)
+
+/* exported interface */
+#define atomic64_cmpxchg(v, o, n) \
+	((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n)))
+#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
+
+/**
+ * atomic64_add_unless - add unless the number is a given value
+ * @v: pointer of type atomic64_t
+ * @a: the amount to add to v...
+ * @u: ...unless v is equal to u.
+ *
+ * Atomically adds @a to @v, so long as it was not @u.
+ * Returns the old value of @v.
+ */
+static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
+{
+	long c, old;
+	c = atomic64_read(v);
+	for (;;) {
+		if (unlikely(c == (u)))
+			break;
+		old = atomic64_cmpxchg((v), c, c + (a));
+		if (likely(old == c))
+			break;
+		c = old;
+	}
+	return c != (u);
+}
+
+#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
+
+#endif /* !CONFIG_64BIT */
+
+
+#endif /* _ASM_PARISC_ATOMIC_H_ */