1 files changed, 43 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/gpxe/src/arch/i386/include/bits/byteswap.h b/contrib/syslinux-4.02/gpxe/src/arch/i386/include/bits/byteswap.h
new file mode 100644
index 0000000..ddbd40e
--- /dev/null
+++ b/contrib/syslinux-4.02/gpxe/src/arch/i386/include/bits/byteswap.h
@@ -0,0 +1,43 @@
+#ifndef ETHERBOOT_BITS_BYTESWAP_H
+#define ETHERBOOT_BITS_BYTESWAP_H
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+static inline __attribute__ ((always_inline, const)) uint16_t
+__bswap_variable_16(uint16_t x)
+{
+	__asm__("xchgb %b0,%h0\n\t"
+		: "=q" (x)
+		: "0" (x));
+	return x;
+}
+
+static inline __attribute__ ((always_inline, const)) uint32_t
+__bswap_variable_32(uint32_t x)
+{
+	__asm__("xchgb %b0,%h0\n\t"
+		"rorl $16,%0\n\t"
+		"xchgb %b0,%h0"
+		: "=q" (x)
+		: "0" (x));
+	return x;
+}
+
+static inline __attribute__ ((always_inline, const)) uint64_t
+__bswap_variable_64(uint64_t x)
+{
+	union {
+		uint64_t qword;
+		uint32_t dword[2]; 
+	} u;
+
+	u.qword = x;
+	u.dword[0] = __bswap_variable_32(u.dword[0]);
+	u.dword[1] = __bswap_variable_32(u.dword[1]);
+	__asm__("xchgl %0,%1"
+		: "=r" ( u.dword[0] ), "=r" ( u.dword[1] )
+		: "0" ( u.dword[0] ), "1" ( u.dword[1] ) );
+	return u.qword;
+}
+
+#endif /* ETHERBOOT_BITS_BYTESWAP_H */