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-rw-r--r--arch/x86/include/uapi/asm/swab.h37
1 files changed, 37 insertions, 0 deletions
diff --git a/arch/x86/include/uapi/asm/swab.h b/arch/x86/include/uapi/asm/swab.h
new file mode 100644
index 000000000..cd3fd8ddb
--- /dev/null
+++ b/arch/x86/include/uapi/asm/swab.h
@@ -0,0 +1,37 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _ASM_X86_SWAB_H
+#define _ASM_X86_SWAB_H
+
+#include <linux/types.h>
+#include <linux/compiler.h>
+
+static inline __attribute_const__ __u32 __arch_swab32(__u32 val)
+{
+ asm("bswapl %0" : "=r" (val) : "0" (val));
+ return val;
+}
+#define __arch_swab32 __arch_swab32
+
+static inline __attribute_const__ __u64 __arch_swab64(__u64 val)
+{
+#ifdef __i386__
+ union {
+ struct {
+ __u32 a;
+ __u32 b;
+ } s;
+ __u64 u;
+ } v;
+ v.u = val;
+ asm("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
+ : "=r" (v.s.a), "=r" (v.s.b)
+ : "0" (v.s.a), "1" (v.s.b));
+ return v.u;
+#else /* __i386__ */
+ asm("bswapq %0" : "=r" (val) : "0" (val));
+ return val;
+#endif
+}
+#define __arch_swab64 __arch_swab64
+
+#endif /* _ASM_X86_SWAB_H */