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mmio: provide bitsets and test them

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fix #853
This commit is contained in:
Martin Stein
2013-08-23 00:50:08 +02:00
committed by Norman Feske
parent e272264cb2
commit d4e435d732
3 changed files with 177 additions and 4 deletions
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61
base/include/util/mmio.h
View File

@@ -508,6 +508,67 @@ namespace Genode
}
/***********************
** Access to bitsets **
***********************/
/**
* Read bitset 'T' (composed of 2 parts)
*/
template <typename T>
inline typename T::Bitset_2_base::access_t const read()
{
typedef typename T::Bitset_2_base::Bits_0 Bits_0;
typedef typename T::Bitset_2_base::Bits_1 Bits_1;
return read<Bits_0>() |
(read<Bits_1>() << Bits_0::BITFIELD_WIDTH);
}
/**
* Override bitset 'T' (composed of 2 parts)
*
* \param v value that shall be written
*/
template <typename T>
inline void write(typename T::Bitset_2_base::access_t v)
{
typedef typename T::Bitset_2_base::Bits_0 Bits_0;
typedef typename T::Bitset_2_base::Bits_1 Bits_1;
write<Bits_0>(v);
write<Bits_1>(v >> Bits_0::BITFIELD_WIDTH);
}
/**
* Read bitset 'T' (composed of 3 parts)
*/
template <typename T>
inline typename T::Bitset_3_base::access_t const read()
{
typedef typename T::Bitset_3_base::Bits_0 Bits_0;
typedef typename T::Bitset_3_base::Bits_1 Bits_1;
typedef typename T::Bitset_3_base::Bits_2 Bits_2;
return read<Bitset_2<Bits_0, Bits_1> >() |
(read<Bits_2>() << (Bits_0::BITFIELD_WIDTH +
Bits_1::BITFIELD_WIDTH));
}
/**
* Override bitset 'T' (composed of 3 parts)
*
* \param v value that shall be written
*/
template <typename T>
inline void write(typename T::Bitset_3_base::access_t v)
{
typedef typename T::Bitset_3_base::Bits_0 Bits_0;
typedef typename T::Bitset_3_base::Bits_1 Bits_1;
typedef typename T::Bitset_3_base::Bits_2 Bits_2;
write<Bitset_2<Bits_0, Bits_1> >(v);
write<Bits_2>(v >> (Bits_0::BITFIELD_WIDTH +
Bits_1::BITFIELD_WIDTH));
}
/*********************************
** Polling for bitfield states **
*********************************/

69
base/include/util/register.h
View File

@@ -20,7 +20,20 @@
namespace Genode
{
namespace Trait {
namespace Trait
{
/**
* Round bit width up to an appropriate uint width or 0 if not feasible
*/
template <unsigned _WIDTH>
struct Raise_to_uint_width
{
enum { WIDTH = _WIDTH < 2 ? 1 :
_WIDTH < 9 ? 8 :
_WIDTH < 17 ? 16 :
_WIDTH < 33 ? 32 :
_WIDTH < 65 ? 64 : 0, };
};
/**
* Properties of integer types with a given bitwidth
@@ -113,6 +126,7 @@ namespace Genode
enum {
ACCESS_WIDTH = _ACCESS_WIDTH,
ACCESS_WIDTH_LOG2 = Trait::Uint_width<ACCESS_WIDTH>::WIDTH_LOG2,
BITFIELD_WIDTH = ACCESS_WIDTH,
};
typedef typename Trait::Uint_width<ACCESS_WIDTH>::Type access_t;
@@ -135,8 +149,9 @@ namespace Genode
/**
* Fetch template parameters
*/
SHIFT = _SHIFT,
WIDTH = _WIDTH,
SHIFT = _SHIFT,
WIDTH = _WIDTH,
BITFIELD_WIDTH = WIDTH,
};
/**
@@ -198,6 +213,54 @@ namespace Genode
};
};
};
/**
* Bitfield that is composed of 2 separate parts
*
* \param _BITS_X Register, bitfield or/and bitset types the
* bitset is composed of. The order of arguments
* is also the order of bit significance starting
* with the least.
*/
template <typename _BITS_0, typename _BITS_1>
struct Bitset_2
{
typedef _BITS_0 Bits_0;
typedef _BITS_1 Bits_1;
enum {
WIDTH = Bits_0::BITFIELD_WIDTH +
Bits_1::BITFIELD_WIDTH,
BITFIELD_WIDTH = WIDTH,
ACCESS_WIDTH = Trait::Raise_to_uint_width<WIDTH>::WIDTH,
};
typedef typename Trait::Uint_width<ACCESS_WIDTH>::Type access_t;
typedef Bitset_2<Bits_0, Bits_1> Bitset_2_base;
};
/**
* Bitfield that is composed of 3 separate parts
*
* \param _BITS_X Register, bitfield or/and bitset types the
* bitset is composed of. The order of arguments
* is also the order of bit significance starting
* with the least.
*/
template <typename _BITS_0, typename _BITS_1, typename _BITS_2>
struct Bitset_3
{
typedef _BITS_0 Bits_0;
typedef _BITS_1 Bits_1;
typedef _BITS_2 Bits_2;
enum {
WIDTH = Bits_0::BITFIELD_WIDTH +
Bits_1::BITFIELD_WIDTH +
Bits_2::BITFIELD_WIDTH,
BITFIELD_WIDTH = WIDTH,
ACCESS_WIDTH = Trait::Raise_to_uint_width<WIDTH>::WIDTH,
};
typedef typename Trait::Uint_width<ACCESS_WIDTH>::Type access_t;
typedef Bitset_3<Bits_0, Bits_1, Bits_2> Bitset_3_base;
};
}
#endif /* _INCLUDE__UTIL__REGISTER_H_ */