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diff --git a/include/proc_hcd_common.H b/include/proc_hcd_common.H
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+++ b/include/proc_hcd_common.H
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+#ifndef __PROC_HCD_COMMON_H
+#define __PROC_HCD_COMMON_H
+
+/// \file proc_hcd_common.H
+/// \brief Standard bit-manipulation macros (C and Assembler) for PORE code
+
+/// \defgroup be64_bits Bit manipulation for 64-bit Big-Endian values
+///
+/// \note These macros only work in the assembler context because we build our
+/// assemblers to do 64-bit arithmetic, which is required for PORE assembly.
+///
+/// @{
+
+/// Create a multi-bit mask of \a n bits starting at bit \a b
+#define BITS(b, n) ((ULL(0xffffffffffffffff) << (64 - (n))) >> (b))
+
+/// Create a single bit mask at bit \a b
+#define BIT(b) BITS((b), 1)
+
+#endif  // __PROC_HCD_COMMON_H