99 lines
1.9 KiB
C++
99 lines
1.9 KiB
C++
/*
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* \brief Trace control area
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* \author Norman Feske
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* \date 2013-08-10
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*/
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/*
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* Copyright (C) 2006-2013 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 _CORE__INCLUDE__TRACE__CONTROL_AREA_H_
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#define _CORE__INCLUDE__TRACE__CONTROL_AREA_H_
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#include <base/env.h>
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#include <dataspace/capability.h>
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/* base-internal includes */
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#include <trace/control.h>
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namespace Genode { namespace Trace { class Control_area; } }
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class Genode::Trace::Control_area
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{
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public:
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enum { SIZE = 1024*sizeof(long) };
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private:
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Ram_dataspace_capability _ds;
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Trace::Control *_local_base;
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static Ram_dataspace_capability _try_alloc(size_t size)
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{
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try { return env()->ram_session()->alloc(size); }
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catch (...) { return Ram_dataspace_capability(); }
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}
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static Trace::Control *_try_attach(Dataspace_capability ds)
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{
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try { return env()->rm_session()->attach(ds); }
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catch (...) { return 0; }
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}
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bool _index_valid(int index) const
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{
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return (index + 1)*sizeof(Trace::Control) < SIZE;
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}
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public:
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Control_area()
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:
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_ds(_try_alloc(SIZE)),
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_local_base(_try_attach(_ds))
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{ }
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~Control_area()
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{
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if (_local_base) env()->rm_session()->detach(_local_base);
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if (_ds.valid()) env()->ram_session()->free(_ds);
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}
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Dataspace_capability dataspace() const { return _ds; }
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bool alloc(unsigned &index_out)
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{
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for (unsigned index = 0; _index_valid(index); index++) {
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if (!_local_base[index].is_free()) {
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continue;
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}
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_local_base[index].alloc();
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index_out = index;
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return true;
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}
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PERR("trace-control allocaton failed");
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return false;
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}
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void free(unsigned index)
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{
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if (_index_valid(index))
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_local_base[index].reset();
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}
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Trace::Control *at(unsigned index)
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{
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return _index_valid(index) ? &_local_base[index] : 0;
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}
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};
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#endif /* _CORE__INCLUDE__TRACE__CONTROL_AREA_H_ */
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