patch-2.1.16 linux/include/asm-sparc64/atomic.h

• Lines: 96
• Date: Fri Dec 13 11:37:41 1996
• Orig file: v2.1.15/linux/include/asm-sparc64/atomic.h
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v2.1.15/linux/include/asm-sparc64/atomic.h linux/include/asm-sparc64/atomic.h
@@ -0,0 +1,95 @@
+/* $Id: atomic.h,v 1.6 1996/12/12 15:40:22 davem Exp $
+ * atomic.h: Thankfully the V9 is at least reasonable for this
+ *           stuff.
+ *
+ * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
+ */
+
+#ifndef __ARCH_SPARC64_ATOMIC__
+#define __ARCH_SPARC64_ATOMIC__
+
+/* Make sure gcc doesn't try to be clever and move things around
+ * on us. We need to use _exactly_ the address the user gave us,
+ * not some alias that contains the same information.
+ */
+#define __atomic_fool_gcc(x) ((struct { int a[100]; } *)x)
+
+typedef int atomic_t;
+
+extern __inline__ void atomic_add(atomic_t i, atomic_t *v)
+{
+	unsigned long temp0, temp1;
+	__asm__ __volatile__("
+	lduw		[%2], %0
+1:
+	add		%0, %3, %1
+	cas		[%2], %0, %1
+	cmp		%0, %1
+	bne,a,pn	%%icc, 1b
+	 lduw		[%2], %0
+2:
+" 	: "=&r" (temp0), "=&r" (temp1), "=r" (__atomic_fool_gcc(v))
+	: "ir" (i), "r" (__atomic_fool_gcc(v)));
+}
+
+extern __inline__ void atomic_sub(atomic_t i, atomic_t *v)
+{
+	unsigned long temp0, temp1;
+	__asm__ __volatile__("
+	lduw		[%2], %0
+1:
+	sub		%0, %3, %1
+	cas		[%2], %0, %1
+	cmp		%0, %1
+	bne,a,pn	%%icc, 1b
+	 lduw		[%2], %0
+2:
+"	: "=&r" (temp0), "=&r" (temp1), "=r" (__atomic_fool_gcc(v))
+	: "ir" (i), "r" (__atomic_fool_gcc(v)));
+}
+
+/* Same as above, but return the result value. */
+extern __inline__ long atomic_add_return(atomic_t i, atomic_t *v)
+{
+	long temp0, result;
+	__asm__ __volatile__("
+	lduw		[%2], %0
+1:
+	add		%0, %3, %1
+	cas		[%2], %0, %1
+	cmp		%0, %1
+	bne,a,pn	%%icc, 1b
+	 lduw		[%2], %0
+2:
+"	: "=&r" (temp0), "=&r" (result), "=r" (__atomic_fool_gcc(v))
+	: "ir" (i), "r" (__atomic_fool_gcc(v)));
+	return result;
+}
+
+extern __inline__ long atomic_sub_return(atomic_t i, atomic_t *v)
+{
+	long temp0, result;
+	__asm__ __volatile__("
+	lduw		[%2], %0
+1:
+	sub		%0, %3, %1
+	cas		[%2], %0, %1
+	cmp		%0, %1
+	bne,a,pn	%%icc, 1b
+	 lduw		[%2], %0
+2:
+"	: "=&r" (temp0), "=&r" (result), "=r" (__atomic_fool_gcc(v))
+	: "ir" (i), "r" (__atomic_fool_gcc(v)));
+	return result;
+}
+
+#define atomic_dec_return(v) atomic_sub_return(1,(v))
+#define atomic_inc_return(v) atomic_add_return(1,(v))
+
+#define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0)
+#define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)
+
+#define atomic_inc(v) atomic_add(1,(v))
+#define atomic_dec(v) atomic_sub(1,(v))
+
+#endif /* !(__ARCH_SPARC64_ATOMIC__) */