69 lines
1.4 KiB
C
69 lines
1.4 KiB
C
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/*
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* \brief Generic accessor framework for highly structured memory regions
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* \author Martin stein
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* \date 2011-11-10
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*/
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#ifndef _BASE__INCLUDE__UTIL__REGISTER_H_
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#define _BASE__INCLUDE__UTIL__REGISTER_H_
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#include <base/stdint.h>
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namespace Genode
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{
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/**
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* A POD-like highly structured memory region
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*/
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template <typename STORAGE_T>
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struct Register
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{
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typedef STORAGE_T storage_t;
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/**
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* A bitregion within a register
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*/
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template <unsigned long BIT_SHIFT, unsigned long BIT_SIZE>
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struct Subreg
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{
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enum {
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SHIFT = BIT_SHIFT,
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WIDTH = BIT_SIZE,
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MASK = (1 << WIDTH) - 1,
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};
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/**
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* Back reference to containing register
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*/
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typedef Register<storage_t> Compound_reg;
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/**
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* Get a register value with this subreg set to 'value'
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* and the rest left zero
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*/
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static storage_t bits(storage_t const value) { return (value & MASK) << SHIFT; }
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/**
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* Get value of this subreg from 'reg'
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*/
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static storage_t value(storage_t const reg) { return (reg >> SHIFT) & MASK; }
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/**
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* Get registervalue 'reg' with this subreg set to zero
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*/
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static void clear_bits(storage_t & reg) { reg &= ~(MASK << SHIFT); }
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/**
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* Get registervalue 'reg' with this subreg set to 'value'
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*/
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static void set_bits(storage_t & reg, storage_t const value = ~0)
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{
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clear_bits(reg);
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reg |= (value & MASK) << SHIFT;
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};
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};
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};
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}
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#endif /* _BASE__INCLUDE__UTIL__CPU_REGISTER_H_ */
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