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90 lines
1.8 KiB
C++
90 lines
1.8 KiB
C++
/*
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* \brief Type-safe, fine-grained access to a continuous MMIO region
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* \author Martin stein
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* \date 2011-10-26
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*/
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/*
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* Copyright (C) 2011-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__UTIL__MMIO_H_
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#define _INCLUDE__UTIL__MMIO_H_
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/* Genode includes */
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#include <util/register_set.h>
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namespace Genode {
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class Mmio_plain_access;
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class Mmio;
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}
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/**
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* Plain access implementation for MMIO
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*/
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class Genode::Mmio_plain_access
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{
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friend Register_set_plain_access;
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private:
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addr_t const _base;
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/**
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* Write '_ACCESS_T' typed 'value' to MMIO base + 'offset'
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*/
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template <typename ACCESS_T>
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inline void _write(off_t const offset, ACCESS_T const value)
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{
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addr_t const dst = _base + offset;
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*(ACCESS_T volatile *)dst = value;
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}
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/**
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* Read '_ACCESS_T' typed from MMIO base + 'offset'
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*/
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template <typename ACCESS_T>
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inline ACCESS_T _read(off_t const &offset) const
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{
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addr_t const dst = _base + offset;
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ACCESS_T const value = *(ACCESS_T volatile *)dst;
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return value;
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}
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public:
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/**
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* Constructor
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*
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* \param base base address of targeted MMIO region
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*/
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Mmio_plain_access(addr_t const base) : _base(base) { }
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addr_t base() const { return _base; }
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};
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/**
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* Type-safe, fine-grained access to a continuous MMIO region
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*
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* For further details refer to the documentation of the 'Register_set' class.
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*/
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struct Genode::Mmio : Mmio_plain_access, Register_set<Mmio_plain_access>
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{
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/**
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* Constructor
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*
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* \param base base address of targeted MMIO region
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*/
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Mmio(addr_t const base)
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:
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Mmio_plain_access(base),
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Register_set(*static_cast<Mmio_plain_access *>(this)) { }
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};
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#endif /* _INCLUDE__UTIL__MMIO_H_ */
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