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-rw-r--r--src/base/bitfield.hh187
1 files changed, 187 insertions, 0 deletions
diff --git a/src/base/bitfield.hh b/src/base/bitfield.hh
index 79dbcc86c..179e14896 100644
--- a/src/base/bitfield.hh
+++ b/src/base/bitfield.hh
@@ -33,6 +33,7 @@
#define __BASE_BITFIELD_HH__
#include <inttypes.h>
+//#include "base/misc.hh"
/**
* Generate a 64-bit mask of 'nbits' 1s, right justified.
@@ -130,6 +131,192 @@ findMsbSet(uint64_t val) {
return msb;
}
+template<class Data, int first, int last=first>
+class BitfieldBase
+{
+ protected:
+ uint8_t __data[sizeof(Data)];
+
+ //These are defined here so it can be specialized for Data, but can be
+ //hidden by RO and WO variants.
+ inline uint64_t getBits(int _first, int _last)
+ {
+ //build up the right bits from the byte array "data"
+ //panic("Not yet implemented.\n");
+ return 0;
+ }
+
+ inline void setBits(int _first, int _last, uint64_t val)
+ {
+ //Set the right bits from the byte array "data"
+ //panic("Not yet implemented.\n");
+ }
+};
+
+template<class Data, int first, int last=first>
+class BitfieldNativeBase
+{
+ protected:
+ Data __data;
+
+ inline uint64_t getBits(int _first, int _last)
+ {
+ return bits(__data, first, last);
+ }
+
+ inline void setBits(int _first, int _last, uint64_t val)
+ {
+ replaceBits(__data, first, last, val);
+ }
+};
+
+template <int first>
+class BitfieldBase<uint64_t, first, first> :
+ public BitfieldNativeBase<uint64_t, first, first>
+{};
+
+template <int first, int last>
+class BitfieldBase<uint64_t, first, last> :
+ public BitfieldNativeBase<uint64_t, first, last>
+{};
+
+template <int first>
+class BitfieldBase<uint32_t, first, first> :
+ public BitfieldNativeBase<uint32_t, first, first>
+{};
+
+template <int first, int last>
+class BitfieldBase<uint32_t, first, last> :
+ public BitfieldNativeBase<uint32_t, first, last>
+{};
+
+template <int first>
+class BitfieldBase<uint16_t, first, first> :
+ public BitfieldNativeBase<uint16_t, first, first>
+{};
+
+template <int first, int last>
+class BitfieldBase<uint16_t, first, last> :
+ public BitfieldNativeBase<uint16_t, first, last>
+{};
+
+template <int first>
+class BitfieldBase<uint8_t, first, first> :
+ public BitfieldNativeBase<uint8_t, first, first>
+{};
+
+template <int first, int last>
+class BitfieldBase<uint8_t, first, last> :
+ public BitfieldNativeBase<uint8_t, first, last>
+{};
+
+template<class Data, int first, int last=first>
+class _BitfieldRO : public BitfieldBase<Data, first, last>
+{
+ public:
+ operator const Data & ()
+ {
+ return this->getBits(first, last);
+ }
+};
+
+template<class Data, int first, int last=first>
+class _BitfieldWO : public BitfieldBase<Data, first, last>
+{
+ public:
+ const Data & operator = (const Data & _data)
+ {
+ this->setBits(first, last, _data);
+ return *this;
+ }
+};
+
+template<class Data, int first, int last=first>
+class _BitfieldRW : public BitfieldBase<Data, first, last>
+{
+ public:
+ operator const Data ()
+ {
+ return this->getBits(first, last);
+ }
+
+ const Data operator = (const Data & _data)
+ {
+ this->setBits(first, last, _data);
+ return *this;
+ }
+};
+
+template <class Type, class Base>
+class BitUnionOperators : public Base
+{
+ public:
+ operator const Type ()
+ {
+ return Base::__data;
+ }
+
+ const Type operator = (const Type & _data)
+ {
+ Base::__data = _data;
+ }
+
+ bool operator < (const Base & base)
+ {
+ return Base::__data < base.__data;
+ }
+
+ bool operator == (const Base & base)
+ {
+ return Base::__data == base.__data;
+ }
+};
+
+#define __BitUnion(type, name) \
+ class __##name { \
+ public: \
+ typedef type __DataType; \
+ union { \
+ type __data;\
+
+#define EndBitUnion(name) \
+ }; \
+ }; \
+ typedef BitUnionOperators<__##name::__DataType, __##name> name;
+
+#define __SubBitUnion(type, name) \
+ union { \
+ type __data; \
+ inline operator const __DataType () \
+ { return __data; } \
+ \
+ inline const __DataType operator = (const __DataType & _data) \
+ { __data = _data; }
+
+#define EndSubBitUnion(name) } name;
+
+//Regular read/write bitfields
+#define BitfieldRW(first, last) _BitfieldRW<__DataType, first, last>
+#define SubBitUnionRW(name, first, last) \
+ __SubBitUnion(BitfieldRW(first, last), name)
+#define Bitfield(first, last) BitfieldRW(first, last)
+#define SubBitUnion(name, first, last) SubBitUnionRW(name, first, last)
+
+//Read only bitfields
+#define BitfieldRO(first, last) _BitfieldRO<__DataType, first, last>
+#define SubBitUnionRO(name, first, last) \
+ __SubBitUnion(BitfieldRO(first, last), name)
+
+//Write only bitfields
+#define BitfieldWO(first, last) _BitfieldWO<__DataType, first, last>
+#define SubBitUnionWO(name, first, last) \
+ __SubBitUnion(BitfieldWO(first, last), name)
+
+#define BitUnion(type, name) __BitUnion(type, name)
+#define BitUnion64(name) __BitUnion(uint64_t, name)
+#define BitUnion32(name) __BitUnion(uint32_t, name)
+#define BitUnion16(name) __BitUnion(uint16_t, name)
+#define BitUnion8(name) __BitUnion(uint8_t, name)
#endif // __BASE_BITFIELD_HH__