genode/repos/base/include/spec/x86/bios_data_area.h
Norman Feske e6729316ff base: uniform base-internal header structure
This patch establishes a common organization of header files
internal to the base framework. The internal headers are located at
'<repository>/src/include/base/internal/'. This structure has been
choosen to make the nature of those headers immediately clear when
included:

  #include <base/internal/lock_helper.h>

Issue #1832
2016-03-07 12:34:45 +01:00

60 lines
1.3 KiB
C++

/*
* \brief Structure of the Bios Data Area after preparation through Bender
* \author Martin Stein
* \date 2015-07-10
*/
/*
* Copyright (C) 2015 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 _INCLUDE__SPEC__X86__BIOS_DATA_AREA_H_
#define _INCLUDE__SPEC__X86__BIOS_DATA_AREA_H_
/* Genode includes */
#include <util/mmio.h>
/* base-internal includes */
#include <base/internal/unmanaged_singleton.h>
namespace Genode { class Bios_data_area; }
class Genode::Bios_data_area : Mmio
{
friend Unmanaged_singleton_constructor;
private:
struct Serial_base_com1 : Register<0x400, 16> { };
struct Equipment : Register<0x410, 16>
{
struct Serial_count : Bitfield<9, 3> { };
};
static addr_t _mmio_base_virt();
Bios_data_area() : Mmio(_mmio_base_virt()) { }
public:
/**
* Obtain I/O ports of COM interfaces from BDA
*/
addr_t serial_port() const
{
Equipment::access_t count = read<Equipment::Serial_count>();
return count ? read<Serial_base_com1>() : 0;
}
/**
* Return BDA singleton
*/
static Bios_data_area * singleton() {
return unmanaged_singleton<Bios_data_area>(); }
};
#endif /* _INCLUDE__SPEC__X86__BIOS_DATA_AREA_H_ */