Initial code.

src/lib/scryptenc/scryptenc_cpuperf.h

Index: src/lib/scryptenc/scryptenc_cpuperf.h
diff --git a/src/lib/scryptenc/scryptenc_cpuperf.h b/src/lib/scryptenc/scryptenc_cpuperf.h
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index 0000000000000000000000000000000000000000..e236fff1d1942a06f7fbbaa18ca34edb1c78aa49
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+++ b/src/lib/scryptenc/scryptenc_cpuperf.h
@@ -0,0 +1,39 @@
+/*-
+ * Copyright 2009 Colin Percival
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file was originally written by Colin Percival as part of the Tarsnap
+ * online backup system.
+ */
+#ifndef _SCRYPTENC_CPUPERF_H_
+#define _SCRYPTENC_CPUPERF_H_
+
+/**
+ * scryptenc_cpuperf(opps):
+ * Estimate the number of salsa20/8 cores which can be executed per second,
+ * and return the value via opps.
+ */
+int scryptenc_cpuperf(double *);
+
+#endif /* !_SCRYPTENC_CPUPERF_H_ */