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Complement test for MMIO framework

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The run script 'run/util_mmio.run' runs a test over basic
functionalities of 'Mmio::Register' and 'Mmio::Register::Subreg'. The
test covers the functions 'read' and 'bits', 'set', 'clear' and 'get'.

Inline function in 'Mmio::Register::Subreg' whose definition otherwise
looks ugly.
This commit is contained in:
Martin Stein
2012-01-10 12:56:45 +01:00
committed by Norman Feske
parent 9329b91aca
commit 01bb7536dd
4 changed files with 324 additions and 23 deletions
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31
base/include/util/mmio.h
View File

@ -4,6 +4,13 @@
* \date 2011-10-26
*/
/*
* Copyright (C) 2011-2012 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#ifndef _BASE__INCLUDE__UTIL__MMIO_H_
#define _BASE__INCLUDE__UTIL__MMIO_H_
@ -87,8 +94,14 @@ namespace Genode
* Calculate the MMIO-relative offset 'offset' and shift 'shift'
* within the according 'storage_t' value to acces subreg no. 'index'
*/
inline static void access_dest(off_t & offset, unsigned long & shift,
unsigned long const index);
static void access_dest(off_t & offset, unsigned long & shift,
unsigned long const index)
{
unsigned long const bit_off = (index+1) * ITERATION_WIDTH - WIDTH;
offset = (off_t) ((bit_off / STORAGE_WIDTH) * sizeof(STORAGE_T));
shift = bit_off - ( offset << BYTE_EXP );
offset += Compound_reg::OFFSET;
}
};
};
@ -166,20 +179,6 @@ namespace Genode
}
template <Genode::off_t OFFSET, typename STORAGE_T>
template <unsigned long BIT_SHIFT, unsigned long BIT_SIZE, unsigned long SUBREGS>
void
Genode::Mmio::Register<OFFSET, STORAGE_T>::Subreg_array<BIT_SHIFT, BIT_SIZE, SUBREGS>::access_dest(Genode::off_t & offset,
unsigned long & shift,
unsigned long const index)
{
unsigned long const bit_off = (index+1) * ITERATION_WIDTH - WIDTH;
offset = (off_t) ((bit_off / STORAGE_WIDTH) * sizeof(STORAGE_T));
shift = bit_off - ( offset << BYTE_EXP );
offset += Compound_reg::OFFSET;
}
template <typename STORAGE_T>
void Genode::Mmio::_write(off_t const o, STORAGE_T const value)
{

23
base/include/util/register.h
View File

@ -4,6 +4,13 @@
* \date 2011-11-10
*/
/*
* Copyright (C) 2011-2012 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#ifndef _BASE__INCLUDE__UTIL__REGISTER_H_
#define _BASE__INCLUDE__UTIL__REGISTER_H_
@ -37,32 +44,34 @@ namespace Genode
typedef Register<storage_t> Compound_reg;
/**
* Get a register value with this subreg set to 'value'
* and the rest left zero
* Get a register value with this subreg set to 'value' and the rest left zero
*
* \detail Useful to combine successive access to multiple subregs
* into one operation
*/
static storage_t bits(storage_t const value) { return (value & MASK) << SHIFT; }
/**
* Get value of this subreg from 'reg'
*/
static storage_t value(storage_t const reg) { return (reg >> SHIFT) & MASK; }
static storage_t get(storage_t const reg) { return (reg >> SHIFT) & MASK; }
/**
* Get registervalue 'reg' with this subreg set to zero
*/
static void clear_bits(storage_t & reg) { reg &= ~(MASK << SHIFT); }
static void clear(storage_t & reg) { reg &= ~(MASK << SHIFT); }
/**
* Get registervalue 'reg' with this subreg set to 'value'
*/
static void set_bits(storage_t & reg, storage_t const value = ~0)
static void set(storage_t & reg, storage_t const value = ~0)
{
clear_bits(reg);
clear(reg);
reg |= (value & MASK) << SHIFT;
};
};
};
}
#endif /* _BASE__INCLUDE__UTIL__CPU_REGISTER_H_ */
#endif /* _BASE__INCLUDE__UTIL__REGISTER_H_ */