* added support for GM45 (might work for other chips in the G4 series)

* added header for dealing with binary numbers and bitmasks (C++ templates)
   these "macro's" might not work well for long words, though


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33749 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/shared/binary-utils.h

@@ -0,0 +1,77 @@
+/*
+ * Copyright 2009, Haiku, Inc. All Rights Reserved.
+ * Distributed under the terms of the MIT License.
+ *
+ * Authors:
+ *		Brecht Machiels, [email protected]
+ */
+
+#ifndef _BINARY_UTILS_H
+#define _BINARY_UTILS_H
+
+
+/* macro for a one-bit bitmask
+*/
+
+#define BIT(n)	(1ULL << n)
+
+/* macro/templates to create bitmasks
+*/
+
+#define BITMASK(high, low)	((unsigned long long)(BitMask<high, low>::value))
+
+template<int h, int l>
+struct BitMask
+{
+	enum { value = (BitMask<h-l-1,0>::value +
+		(1ULL << h - l)) << l };
+};
+
+
+template<>
+struct BitMask<-1,0>
+{
+	enum { value = 0ULL };
+};
+
+
+/* macro/templates to enter binary constants
+*/
+
+#define BINARY(binstring)	((unsigned long long)(Binary<0##binstring>::value))
+
+// http://www.eptacom.net/pubblicazioni/pub_eng/binary.html
+template<const unsigned long long N> struct Binary
+{
+	enum { value = (N % 8ULL) + 2ULL * Binary<N / 8ULL>::value };
+};
+
+
+struct Binary<0>
+{
+	enum { value = 0ULL } ;
+};
+
+
+/* macro/templates to determine offset
+
+   NOTE: broken for high bit indices
+*/
+
+#define MASKOFFSET(mask)	(MaskOffset<mask, (mask & 1UL)>::count)
+
+template<const unsigned long mask, unsigned int firstBit>
+struct MaskOffset
+{
+	enum { count = MaskOffset<(mask >> 1), ((mask >> 1) & 1UL)>::count + 1 };
+};
+
+
+template<const unsigned long mask>
+struct MaskOffset<mask, 1>
+{
+	enum { count = 0 };
+};
+
+#endif // _BINARY_UTILS_H
+