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mmio: fix type inaccuracy in bitset reads

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We must ensure that the type in use fits the shift value that gets
applied while combining the bitset sub-values.

ref #1095
This commit is contained in:
Martin Stein 2014-03-13 17:55:07 +01:00 committed by Norman Feske
parent 76668f0774
commit 6476cb3bbd
1 changed files with 14 additions and 5 deletions
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19
base/include/util/mmio.h
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@ -520,8 +520,11 @@ namespace Genode
{
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);
typedef typename T::Bitset_2_base::access_t access_t;
enum { V1_SHIFT = Bits_0::BITFIELD_WIDTH };
access_t const v0 = read<Bits_0>();
access_t const v1 = read<Bits_1>();
return v0 | (v1 << V1_SHIFT);
}
/**
@ -547,9 +550,15 @@ namespace Genode
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));
typedef typename T::Bitset_3_base::access_t access_t;
enum {
BITS_0_WIDTH = Bits_0::BITFIELD_WIDTH,
BITS_1_WIDTH = Bits_1::BITFIELD_WIDTH,
V1_SHIFT = BITS_0_WIDTH + BITS_1_WIDTH,
};
access_t const v0 = read<Bitset_2<Bits_0, Bits_1> >();
access_t const v1 = read<Bits_2>();
return v0 | (v1 << V1_SHIFT);
}
/**