1 files changed, 71 insertions, 0 deletions
diff --git a/arch/mips/include/uapi/asm/swab.h b/arch/mips/include/uapi/asm/swab.h
new file mode 100644
index 000000000..d6795fe4e
--- /dev/null
+++ b/arch/mips/include/uapi/asm/swab.h
@@ -0,0 +1,71 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1996, 99, 2003 by Ralf Baechle
+ */
+#ifndef _ASM_SWAB_H
+#define _ASM_SWAB_H
+
+#include <linux/compiler.h>
+#include <linux/types.h>
+
+#define __SWAB_64_THRU_32__
+
+#if !defined(__mips16) &&					\
+	((defined(__mips_isa_rev) && (__mips_isa_rev >= 2)) ||	\
+	 defined(_MIPS_ARCH_LOONGSON3A))
+
+static inline __attribute_const__ __u16 __arch_swab16(__u16 x)
+{
+	__asm__(
+	"	.set	push			\n"
+	"	.set	arch=mips32r2		\n"
+	"	wsbh	%0, %1			\n"
+	"	.set	pop			\n"
+	: "=r" (x)
+	: "r" (x));
+
+	return x;
+}
+#define __arch_swab16 __arch_swab16
+
+static inline __attribute_const__ __u32 __arch_swab32(__u32 x)
+{
+	__asm__(
+	"	.set	push			\n"
+	"	.set	arch=mips32r2		\n"
+	"	wsbh	%0, %1			\n"
+	"	rotr	%0, %0, 16		\n"
+	"	.set	pop			\n"
+	: "=r" (x)
+	: "r" (x));
+
+	return x;
+}
+#define __arch_swab32 __arch_swab32
+
+/*
+ * Having already checked for MIPS R2, enable the optimized version for
+ * 64-bit kernel on r2 CPUs.
+ */
+#ifdef __mips64
+static inline __attribute_const__ __u64 __arch_swab64(__u64 x)
+{
+	__asm__(
+	"	.set	push			\n"
+	"	.set	arch=mips64r2		\n"
+	"	dsbh	%0, %1			\n"
+	"	dshd	%0, %0			\n"
+	"	.set	pop			\n"
+	: "=r" (x)
+	: "r" (x));
+
+	return x;
+}
+#define __arch_swab64 __arch_swab64
+#endif /* __mips64 */
+#endif /* (not __mips16) and (MIPS R2 or newer or Loongson 3A) */
+#endif /* _ASM_SWAB_H */