49 lines
1.2 KiB
C++
49 lines
1.2 KiB
C++
/*
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* \brief Core-internal utilities
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* \author Martin Stein
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* \author Stefan Kalkowski
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* \date 2012-01-02
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*/
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/*
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* Copyright (C) 2012-2017 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 Affero General Public License version 3.
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*/
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#ifndef _CORE__UTIL_H_
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#define _CORE__UTIL_H_
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#include <hw/util.h>
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namespace Genode
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{
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using Hw::get_page_mask;
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using Hw::trunc_page;
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using Hw::round_page;
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using Hw::trunc;
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using Hw::aligned;
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using Hw::round;
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/**
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* Select source used for map operations
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*/
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constexpr addr_t map_src_addr(addr_t, addr_t phys) { return phys; }
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/**
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* Return highest supported flexpage size for the given mapping size
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*
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* This function is called by the page-fault handler to determine the
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* mapping granularity to be used for a page-fault answer. If a kernel
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* supports flexible page sizes, this function can just return the
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* argument. If a kernel only supports a certain set of map sizes such
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* as 4K and 4M, this function should select one of those smaller or
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* equal to the argument.
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*/
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constexpr size_t constrain_map_size_log2(size_t size_log2) {
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return (size_log2 < 20) ? 12 : 20; }
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}
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#endif /* _CORE__UTIL_H_ */
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