9da42dde2f
Previously, we did the protection-domain switches without a transitional translation table that contains only global mappings. This was fine as long as the CPU did no speculative memory accesses. However, to enabling branch prediction triggers such accesses. Thus, if we don't want to invalidate predictors on every context switch, we need to switch more carefully. ref #474
39 lines
903 B
C++
39 lines
903 B
C++
/*
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* \brief Kernel backend for protection domains
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* \author Martin Stein
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* \author Stefan Kalkowski
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* \date 2012-11-30
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*/
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/*
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* Copyright (C) 2012-2013 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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/* core includes */
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#include <kernel/pd.h>
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/* Genode includes */
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#include <unmanaged_singleton.h>
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using namespace Kernel;
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Mode_transition_control::Mode_transition_control()
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: _slab(&_allocator), _master(&_table)
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{
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assert(Genode::aligned(this, ALIGN_LOG2));
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assert(sizeof(_master) <= _master_context_size());
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assert(_size() <= SIZE);
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map(&_table, &_slab);
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Genode::memcpy(&_mt_master_context_begin, &_master, sizeof(_master));
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}
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Mode_transition_control * Kernel::mtc()
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{
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typedef Mode_transition_control Control;
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return unmanaged_singleton<Control, Control::ALIGN>();
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}
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