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-rw-r--r--arch/parisc/lib/bitops.c82
1 files changed, 82 insertions, 0 deletions
diff --git a/arch/parisc/lib/bitops.c b/arch/parisc/lib/bitops.c
new file mode 100644
index 000000000..187118841
--- /dev/null
+++ b/arch/parisc/lib/bitops.c
@@ -0,0 +1,82 @@
+/*
+ * bitops.c: atomic operations which got too long to be inlined all over
+ * the place.
+ *
+ * Copyright 1999 Philipp Rumpf (prumpf@tux.org)
+ * Copyright 2000 Grant Grundler (grundler@cup.hp.com)
+ */
+
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <linux/atomic.h>
+
+#ifdef CONFIG_SMP
+arch_spinlock_t __atomic_hash[ATOMIC_HASH_SIZE] __lock_aligned = {
+ [0 ... (ATOMIC_HASH_SIZE-1)] = __ARCH_SPIN_LOCK_UNLOCKED
+};
+#endif
+
+#ifdef CONFIG_64BIT
+unsigned long __xchg64(unsigned long x, unsigned long *ptr)
+{
+ unsigned long temp, flags;
+
+ _atomic_spin_lock_irqsave(ptr, flags);
+ temp = *ptr;
+ *ptr = x;
+ _atomic_spin_unlock_irqrestore(ptr, flags);
+ return temp;
+}
+#endif
+
+unsigned long __xchg32(int x, int *ptr)
+{
+ unsigned long flags;
+ long temp;
+
+ _atomic_spin_lock_irqsave(ptr, flags);
+ temp = (long) *ptr; /* XXX - sign extension wanted? */
+ *ptr = x;
+ _atomic_spin_unlock_irqrestore(ptr, flags);
+ return (unsigned long)temp;
+}
+
+
+unsigned long __xchg8(char x, char *ptr)
+{
+ unsigned long flags;
+ long temp;
+
+ _atomic_spin_lock_irqsave(ptr, flags);
+ temp = (long) *ptr; /* XXX - sign extension wanted? */
+ *ptr = x;
+ _atomic_spin_unlock_irqrestore(ptr, flags);
+ return (unsigned long)temp;
+}
+
+
+#ifdef CONFIG_64BIT
+unsigned long __cmpxchg_u64(volatile unsigned long *ptr, unsigned long old, unsigned long new)
+{
+ unsigned long flags;
+ unsigned long prev;
+
+ _atomic_spin_lock_irqsave(ptr, flags);
+ if ((prev = *ptr) == old)
+ *ptr = new;
+ _atomic_spin_unlock_irqrestore(ptr, flags);
+ return prev;
+}
+#endif
+
+unsigned long __cmpxchg_u32(volatile unsigned int *ptr, unsigned int old, unsigned int new)
+{
+ unsigned long flags;
+ unsigned int prev;
+
+ _atomic_spin_lock_irqsave(ptr, flags);
+ if ((prev = *ptr) == old)
+ *ptr = new;
+ _atomic_spin_unlock_irqrestore(ptr, flags);
+ return (unsigned long)prev;
+}