1 files changed, 77 insertions, 0 deletions
diff --git a/StdLib/Include/sys/bswap.h b/StdLib/Include/sys/bswap.h
new file mode 100644
index 0000000000..a9284eb81d
--- /dev/null
+++ b/StdLib/Include/sys/bswap.h
@@ -0,0 +1,77 @@
+/*      $NetBSD: bswap.h,v 1.12 2006/05/22 16:28:27 drochner Exp $      */
+
+/* Written by Manuel Bouyer. Public domain */
+
+#ifndef _SYS_BSWAP_H_
+#define _SYS_BSWAP_H_
+
+#ifndef _LOCORE
+#include  <sys/EfiCdefs.h>
+#include  <sys/types.h>
+
+#include  <machine/bswap.h>
+
+__BEGIN_DECLS
+/* Always declare the functions in case their address is taken (etc) */
+#if !defined(__BSWAP_RENAME)
+uint16_t bswap16(uint16_t) __attribute__((__const__));
+uint32_t bswap32(uint32_t) __attribute__((__const__));
+#else
+uint16_t bswap16(uint16_t) __RENAME(__bswap16) __attribute__((__const__));
+uint32_t bswap32(uint32_t) __RENAME(__bswap32) __attribute__((__const__));
+#endif
+uint64_t bswap64(uint64_t) __attribute__((__const__));
+__END_DECLS
+
+#if defined(__GNUC__) && defined(__OPTIMIZE__)
+
+/* machine/byte_swap.h might have defined inline versions */
+#ifndef __BYTE_SWAP_U64_VARIABLE
+#define __BYTE_SWAP_U64_VARIABLE bswap64
+#endif
+
+#ifndef __BYTE_SWAP_U32_VARIABLE
+#define __BYTE_SWAP_U32_VARIABLE bswap32
+#endif
+
+#ifndef __BYTE_SWAP_U16_VARIABLE
+#define __BYTE_SWAP_U16_VARIABLE bswap16
+#endif
+
+#define __byte_swap_u64_constant(x) \
+  ((uint64_t) \
+   ((((x) & 0xff00000000000000ull) >> 56) | \
+    (((x) & 0x00ff000000000000ull) >> 40) | \
+    (((x) & 0x0000ff0000000000ull) >> 24) | \
+    (((x) & 0x000000ff00000000ull) >>  8) | \
+    (((x) & 0x00000000ff000000ull) <<  8) | \
+    (((x) & 0x0000000000ff0000ull) << 24) | \
+    (((x) & 0x000000000000ff00ull) << 40) | \
+    (((x) & 0x00000000000000ffull) << 56)))
+
+#define __byte_swap_u32_constant(x) \
+  ((((x) & 0xff000000) >> 24) | \
+   (((x) & 0x00ff0000) >>  8) | \
+   (((x) & 0x0000ff00) <<  8) | \
+   (((x) & 0x000000ff) << 24))
+
+#define __byte_swap_u16_constant(x) \
+  ((((x) & 0xff00) >> 8) | \
+   (((x) & 0x00ff) << 8))
+
+#define bswap64(x) \
+  (__builtin_constant_p((x)) ? \
+   __byte_swap_u64_constant(x) : __BYTE_SWAP_U64_VARIABLE(x))
+
+#define bswap32(x) \
+  (__builtin_constant_p((x)) ? \
+   __byte_swap_u32_constant(x) : __BYTE_SWAP_U32_VARIABLE(x))
+
+#define bswap16(x) \
+  (__builtin_constant_p((x)) ? \
+   __byte_swap_u16_constant(x) : __BYTE_SWAP_U16_VARIABLE(x))
+
+#endif /* __GNUC__ && __OPTIMIZE__ */
+#endif /* !_LOCORE */
+
+#endif /* !_SYS_BSWAP_H_ */