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-rw-r--r--arch/s390/include/uapi/asm/swab.h89
1 files changed, 89 insertions, 0 deletions
diff --git a/arch/s390/include/uapi/asm/swab.h b/arch/s390/include/uapi/asm/swab.h
new file mode 100644
index 000000000000..da3bfe5cc161
--- /dev/null
+++ b/arch/s390/include/uapi/asm/swab.h
@@ -0,0 +1,89 @@
+#ifndef _S390_SWAB_H
+#define _S390_SWAB_H
+
+/*
+ * S390 version
+ * Copyright IBM Corp. 1999
+ * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
+ */
+
+#include <linux/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,%O1+3(%R1)\n"
+ " icm %0,4,%O1+2(%R1)\n"
+ " icm %0,2,%O1+1(%R1)\n"
+ " ic %0,%1"
+ : "=&d" (result) : "Q" (*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,%O1+1(%R1)\n"
+ " ic %0,%1\n"
+ : "=&d" (result) : "Q" (*x) : "cc");
+#else /* __s390x__ */
+ " lrvh %0,%1"
+ : "=d" (result) : "m" (*x));
+#endif /* __s390x__ */
+ return result;
+}
+#define __arch_swab16p __arch_swab16p
+
+#endif /* _S390_SWAB_H */