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60 lines
1.2 KiB
C
60 lines
1.2 KiB
C
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/*
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* \brief Structure of the Bios Data Area after preparation through Bender
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* \author Martin Stein
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* \date 2015-07-10
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*/
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/*
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* Copyright (C) 2015 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 General Public License version 2.
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*/
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#ifndef _BIOS_DATA_AREA_H_
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#define _BIOS_DATA_AREA_H_
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/* Genode includes */
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#include <util/mmio.h>
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/* base includes */
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#include <unmanaged_singleton.h>
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namespace Genode { class Bios_data_area; }
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class Genode::Bios_data_area : Mmio
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{
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friend Unmanaged_singleton_constructor;
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private:
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struct Serial_base_com1 : Register<0x400, 16> { };
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struct Equipment : Register<0x410, 16>
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{
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struct Serial_count : Bitfield<9, 3> { };
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};
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static addr_t _mmio_base_virt();
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Bios_data_area() : Mmio(_mmio_base_virt()) { }
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public:
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/**
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* Obtain I/O ports of COM interfaces from BDA
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*/
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addr_t serial_port() const
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{
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Equipment::access_t count = read<Equipment::Serial_count>();
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return count ? read<Serial_base_com1>() : 0;
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}
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/**
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* Return BDA singleton
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*/
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static Bios_data_area * singleton() {
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return unmanaged_singleton<Bios_data_area>(); }
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};
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#endif /* _BIOS_DATA_AREA_H_ */
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