Standard Libraries for EDK II.

This set of three packages: AppPkg, StdLib, StdLibPrivateInternalFiles; contains the implementation of libraries based upon non-UEFI standards such as ISO/IEC-9899, the library portion of the C Language Standard, POSIX, etc.

AppPkg contains applications that make use of the standard libraries defined in the StdLib Package.

StdLib contains header (include) files and the implementations of the standard libraries.

StdLibPrivateInternalFiles contains files for the exclusive use of the library implementations in StdLib.  These files should never be directly referenced from applications or other code.


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11600 6f19259b-4bc3-4df7-8a09-765794883524

StdLib/LibC/Main/bswap64.c

@@ -0,0 +1,44 @@
+/*  $NetBSD: bswap64.c,v 1.1 2005/12/20 19:28:51 christos Exp $    */
+
+/*
+ * Written by Manuel Bouyer <bouyer@NetBSD.org>.
+ * Public domain.
+ */
+
+//#include <sys/cdefs.h>
+//#if defined(LIBC_SCCS) && !defined(lint)
+//__RCSID("$NetBSD: bswap64.c,v 1.1 2005/12/20 19:28:51 christos Exp $");
+//#endif /* LIBC_SCCS and not lint */
+
+//#include <sys/types.h>
+//#include <machine/bswap.h>
+
+#undef bswap64
+
+UINT64
+bswap64(UINT64 x)
+{
+#ifndef _LP64
+  /*
+   * Assume we have wide enough registers to do it without touching
+   * memory.
+   */
+  return  ( (x << 56) & 0xff00000000000000UL ) |
+    ( (x << 40) & 0x00ff000000000000UL ) |
+    ( (x << 24) & 0x0000ff0000000000UL ) |
+    ( (x <<  8) & 0x000000ff00000000UL ) |
+    ( (x >>  8) & 0x00000000ff000000UL ) |
+    ( (x >> 24) & 0x0000000000ff0000UL ) |
+    ( (x >> 40) & 0x000000000000ff00UL ) |
+    ( (x >> 56) & 0x00000000000000ffUL );
+#else
+  /*
+   * Split the operation in two 32bit steps.
+   */
+  u_int32_t tl, th;
+
+  th = bswap32((u_int32_t)(x & 0x00000000ffffffffULL));
+  tl = bswap32((u_int32_t)((x >> 32) & 0x00000000ffffffffULL));
+  return ((u_int64_t)th << 32) | tl;
+#endif
+}