1 files changed, 93 insertions, 0 deletions
diff --git a/arch/parisc/lib/bitops.c b/arch/parisc/lib/bitops.c
new file mode 100644
index 0000000000..36a3141990
--- /dev/null
+++ b/arch/parisc/lib/bitops.c
@@ -0,0 +1,93 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * 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 notrace __xchg64(unsigned long x, volatile 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 notrace __xchg32(int x, volatile 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 notrace __xchg8(char x, volatile 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;
+}
+
+
+u64 notrace __cmpxchg_u64(volatile u64 *ptr, u64 old, u64 new)
+{
+	unsigned long flags;
+	u64 prev;
+
+	_atomic_spin_lock_irqsave(ptr, flags);
+	if ((prev = *ptr) == old)
+		*ptr = new;
+	_atomic_spin_unlock_irqrestore(ptr, flags);
+	return prev;
+}
+
+unsigned long notrace __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;
+}
+
+u8 notrace __cmpxchg_u8(volatile u8 *ptr, u8 old, u8 new)
+{
+	unsigned long flags;
+	u8 prev;
+
+	_atomic_spin_lock_irqsave(ptr, flags);
+	if ((prev = *ptr) == old)
+		*ptr = new;
+	_atomic_spin_unlock_irqrestore(ptr, flags);
+	return prev;
+}