1 files changed, 91 insertions, 0 deletions

diff --git a/arch/s390/include/asm/swab.h b/arch/s390/include/asm/swab.h
new file mode 100644
index 000000000000..bd9321aa55a9
--- /dev/null
+++ b/arch/s390/include/asm/swab.h
@@ -0,0 +1,91 @@
+#ifndef _S390_SWAB_H
+#define _S390_SWAB_H
+
+/*
+ *  include/asm-s390/swab.h
+ *
+ *  S390 version
+ *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
+ */
+
+#include <asm/types.h>
+
+#ifndef __s390x__
+# define __SWAB_64_THRU_32__
+#endif
+
+#ifdef __s390x__
+static inline __u64 __arch_swab64p(const __u64 *x)
+{
+        __u64 result;
+
+        asm volatile("lrvg %0,%1" : "=d" (result) : "m" (*x));
+        return result;
+}
+#define __arch_swab64p __arch_swab64p
+
+static inline __u64 __arch_swab64(__u64 x)
+{
+        __u64 result;
+
+        asm volatile("lrvgr %0,%1" : "=d" (result) : "d" (x));
+        return result;
+}
+#define __arch_swab64 __arch_swab64
+
+static inline void __arch_swab64s(__u64 *x)
+{
+        *x = __arch_swab64p(x);
+}
+#define __arch_swab64s __arch_swab64s
+#endif /* __s390x__ */
+
+static inline __u32 __arch_swab32p(const __u32 *x)
+{
+        __u32 result;
+        
+        asm volatile(
+#ifndef __s390x__
+                "       icm     %0,8,3(%1)\n"
+                "       icm     %0,4,2(%1)\n"
+                "       icm     %0,2,1(%1)\n"
+                "       ic      %0,0(%1)"
+                : "=&d" (result) : "a" (x), "m" (*x) : "cc");
+#else /* __s390x__ */
+                "       lrv     %0,%1"
+                : "=d" (result) : "m" (*x));
+#endif /* __s390x__ */
+        return result;
+}
+#define __arch_swab32p __arch_swab32p
+
+#ifdef __s390x__
+static inline __u32 __arch_swab32(__u32 x)
+{
+        __u32 result;
+        
+        asm volatile("lrvr  %0,%1" : "=d" (result) : "d" (x));
+        return result;
+}
+#define __arch_swab32 __arch_swab32
+#endif /* __s390x__ */
+
+static inline __u16 __arch_swab16p(const __u16 *x)
+{
+        __u16 result;
+        
+        asm volatile(
+#ifndef __s390x__
+                "       icm     %0,2,1(%1)\n"
+                "       ic      %0,0(%1)\n"
+                : "=&d" (result) : "a" (x), "m" (*x) : "cc");
+#else /* __s390x__ */
+                "       lrvh    %0,%1"
+                : "=d" (result) : "m" (*x));
+#endif /* __s390x__ */
+        return result;
+}
+#define __arch_swab16p __arch_swab16p
+
+#endif /* _S390_SWAB_H */