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diff --git a/qemu/roms/ipxe/src/arch/x86_64/include/bits/byteswap.h b/qemu/roms/ipxe/src/arch/x86_64/include/bits/byteswap.h
new file mode 100644
index 000000000..2e472d98a
--- /dev/null
+++ b/qemu/roms/ipxe/src/arch/x86_64/include/bits/byteswap.h
@@ -0,0 +1,47 @@
+#ifndef _BITS_BYTESWAP_H
+#define _BITS_BYTESWAP_H
+
+/** @file
+ *
+ * Byte-order swapping functions
+ *
+ */
+
+#include <stdint.h>
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+static inline __attribute__ (( always_inline, const )) uint16_t
+__bswap_variable_16 ( uint16_t x ) {
+	__asm__ ( "xchgb %b0,%h0" : "=Q" ( x ) : "0" ( x ) );
+	return x;
+}
+
+static inline __attribute__ (( always_inline )) void
+__bswap_16s ( uint16_t *x ) {
+	__asm__ ( "rorw $8, %0" : "+m" ( *x ) );
+}
+
+static inline __attribute__ (( always_inline, const )) uint32_t
+__bswap_variable_32 ( uint32_t x ) {
+	__asm__ ( "bswapl %k0" : "=r" ( x ) : "0" ( x ) );
+	return x;
+}
+
+static inline __attribute__ (( always_inline )) void
+__bswap_32s ( uint32_t *x ) {
+	__asm__ ( "bswapl %k0" : "=r" ( *x ) : "0" ( *x ) );
+}
+
+static inline __attribute__ (( always_inline, const )) uint64_t
+__bswap_variable_64 ( uint64_t x ) {
+	__asm__ ( "bswapq %q0" : "=r" ( x ) : "0" ( x ) );
+	return x;
+}
+
+static inline __attribute__ (( always_inline )) void
+__bswap_64s ( uint64_t *x ) {
+	__asm__ ( "bswapq %q0" : "=r" ( *x ) : "0" ( *x ) );
+}
+
+#endif /* _BITS_BYTESWAP_H */