87 lines
2.2 KiB
C++
87 lines
2.2 KiB
C++
/*
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* \brief I/O MEM dataspace utility
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* \author Norman Feske
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* \date 2011-05-19
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*/
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/*
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* Copyright (C) 2011-2013 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 _INCLUDE__OS__ATTACHED_IO_MEM_DATASPACE_H_
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#define _INCLUDE__OS__ATTACHED_IO_MEM_DATASPACE_H_
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#include <io_mem_session/connection.h>
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#include <base/env.h>
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namespace Genode { class Attached_io_mem_dataspace; }
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/**
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* Request and locally attach a memory-mapped I/O resource
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*
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* This class is a wrapper for a typical sequence of operations performed
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* by device drivers to access memory-mapped device resources. Its sole
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* purpose is to avoid duplicated code.
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*/
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class Genode::Attached_io_mem_dataspace
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{
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private:
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Io_mem_connection _mmio;
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Io_mem_dataspace_capability _ds;
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void *_local_addr;
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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 memory-mapped I/O resource
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* \param size size of resource
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* \param write_combined enable write combining for the resource
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*
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* \throw Parent::Service_denied
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* \throw Parent::Quota_exceeded
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* \throw Parent::Unavailable
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* \throw Rm_session::Attach_failed
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*/
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Attached_io_mem_dataspace(Genode::addr_t base, Genode::size_t size,
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bool write_combined = false)
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:
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_mmio(base, size, write_combined),
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_ds(_mmio.dataspace()),
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_local_addr(env()->rm_session()->attach(_ds))
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{
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/* apply sub-page offset to virtual address */
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_local_addr = (void *)((addr_t)_local_addr | (base & (addr_t)0xfff));
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}
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/**
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* Destructor
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*/
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~Attached_io_mem_dataspace()
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{
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env()->rm_session()->detach(_local_addr);
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}
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/**
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* Return capability of the used RAM dataspace
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*/
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Io_mem_dataspace_capability cap() { return _ds; }
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/**
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* Request local address
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*
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* This is a template to avoid inconvenient casts at the caller.
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* A newly allocated I/O MEM dataspace is untyped memory anyway.
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*/
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template <typename T>
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T *local_addr() { return static_cast<T *>(_local_addr); }
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};
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#endif /* _INCLUDE__OS__ATTACHED_IO_MEM_DATASPACE_H_ */
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