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mmio: provide set and get method for bitsets

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ref #1006
This commit is contained in:
Martin Stein 2013-12-20 02:12:07 +01:00 committed by Norman Feske
parent 1914f5ae2e
commit 864189762c
2 changed files with 74 additions and 5 deletions
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63
base/include/util/register.h
View File

@ -247,6 +247,36 @@ namespace Genode
{
return Bits_0::bits(v) | Bits_1::bits(v >> Bits_0::WIDTH);
}
/**
* Override bitset in a given register value
*
* \param T access type of register
* \param reg register value
* \param value new bitset value
*/
template <typename T>
static inline void set(T & reg, access_t const value)
{
Bits_0::clear(reg);
Bits_1::clear(reg);
Bits_0::set(reg, value);
Bits_1::set(reg, value >> Bits_0::WIDTH);
};
/**
* Read bitset from a given register value
*
* \param T access type of register
* \param reg register value
*
* \return bitset value
*/
template <typename T>
static inline access_t get(T const reg)
{
return Bits_0::get(reg) | (Bits_1::get(reg) << Bits_0::WIDTH);
}
};
/**
@ -263,6 +293,7 @@ namespace Genode
typedef _BITS_0 Bits_0;
typedef _BITS_1 Bits_1;
typedef _BITS_2 Bits_2;
typedef Bitset_2<Bits_0, Bits_1> Bits_0_1;
enum {
WIDTH = Bits_0::BITFIELD_WIDTH +
Bits_1::BITFIELD_WIDTH +
@ -282,9 +313,39 @@ namespace Genode
template <typename T>
static inline T bits(T const v)
{
typedef Bitset_2<Bits_0, Bits_1> Bits_0_1;
return Bits_0_1::bits(v) | Bits_2::bits(v >> Bits_0_1::WIDTH);
}
/**
* Override bitset in a given register value
*
* \param T access type of register
* \param reg register value
* \param value new bitset value
*/
template <typename T>
static inline void set(T & reg, access_t const value)
{
Bits_0::clear(reg);
Bits_1::clear(reg);
Bits_2::clear(reg);
Bits_0_1::set(reg, value);
Bits_2::set(reg, value >> Bits_0_1::WIDTH);
};
/**
* Read bitset from a given register value
*
* \param T access type of register
* \param reg register value
*
* \return bitset value
*/
template <typename T>
static inline access_t get(T const reg)
{
return Bits_0_1::get(reg) | (Bits_2::get(reg) << Bits_0_1::WIDTH);
}
};
}

16
base/src/test/util_mmio/main.cc
View File

@ -132,12 +132,11 @@ struct Test_mmio : public Mmio
{
struct Bits_0 : Bitfield<4, 5> { };
struct Bits_1 : Bitfield<17, 12> { };
struct Bits_2 : Bitfield<1, 3> { };
};
struct My_bitset_2 : Bitset_2<Reg_1::Bits_0, Reg_0> { };
struct My_bitset_3 : Bitset_3<Reg_0, Reg_2::Bits_1, Reg_2::Bits_0> { };
struct My_bitset_4 : Bitset_2<My_bitset_2, Reg_2::Bits_0> { };
struct My_bitset_5 : Bitset_3<Reg_1::Bits_2, Reg_2::Bits_2, Reg_1::Bits_1> { };
struct My_bitset_5 : Bitset_3<Reg_1::Bits_2, Reg_1::Bits_0, Reg_1::Bits_1> { };
};
@ -471,9 +470,18 @@ int main()
return test_failed(19);
/**
* Test 20, bitfield methods of bitsets
* Test 20, bitfield methods at bitsets
*/
if (Test_mmio::My_bitset_5::bits(0b110010110) != 0b1100000010001010) {
Test_mmio::Reg_1::access_t bs5 =
Test_mmio::My_bitset_5::bits(0b1011110010110);
if (bs5 != 0b1100000010001010) {
return test_failed(20);
}
if (Test_mmio::My_bitset_5::get(bs5) != 0b110010110) {
return test_failed(20);
}
Test_mmio::My_bitset_5::set(bs5, 0b1011101101001);
if (bs5 != 0b1011000001000100) {
return test_failed(20);
}