patch-2.4.0-test12 linux/arch/parisc/lib/bitops.c

• Lines: 61
• Date: Wed Dec 6 11:46:39 2000
• Orig file: v2.4.0-test11/linux/arch/parisc/lib/bitops.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test11/linux/arch/parisc/lib/bitops.c linux/arch/parisc/lib/bitops.c
@@ -0,0 +1,60 @@
+/* atomic.c: atomic operations which got too long to be inlined all over
+ * the place.
+ * 
+ * Copyright 1999 Philipp Rumpf (prumpf@tux.org */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <asm/system.h>
+#include <asm/atomic.h>
+
+#ifdef CONFIG_SMP
+spinlock_t __atomic_hash[ATOMIC_HASH_SIZE] = {
+	[0 ... (ATOMIC_HASH_SIZE-1)]  = SPIN_LOCK_UNLOCKED
+};
+#endif
+
+spinlock_t __atomic_lock = SPIN_LOCK_UNLOCKED;
+
+#ifndef __LP64__
+unsigned long __xchg(unsigned long x, unsigned long *ptr, int size)
+{
+	unsigned long temp, flags;
+
+	if (size != sizeof x) {
+		printk("__xchg called with bad pointer\n");
+	}
+	spin_lock_irqsave(&__atomic_lock, flags);
+	temp = *ptr;
+	*ptr = x;
+	spin_unlock_irqrestore(&__atomic_lock, flags);
+	return temp;
+}
+#else
+unsigned long __xchg(unsigned long x, unsigned long *ptr, int size)
+{
+	unsigned long temp, flags;
+	unsigned int *ptr32;
+
+	if (size == 8) {
+try_long:
+		spin_lock_irqsave(&__atomic_lock, flags);
+		temp = *ptr;
+		*ptr = x;
+		spin_unlock_irqrestore(&__atomic_lock, flags);
+		return temp;
+	}
+	if (size == 4) {
+		ptr32 = (unsigned int *)ptr;
+		spin_lock_irqsave(&__atomic_lock, flags);
+		temp = (unsigned long)*ptr32;
+		*ptr32 = (unsigned int)x;
+		spin_unlock_irqrestore(&__atomic_lock, flags);
+		return temp;
+	}
+
+	printk("__xchg called with bad pointer\n");
+	goto try_long;
+}
+#endif