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43 lines
1.0 KiB
C++
43 lines
1.0 KiB
C++
/*
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* \brief Dimensioning of the hierarchic 'Chunk' structure for the RAM fs
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* \author Norman Feske
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* \date 2019-03-17
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*/
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/*
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* Copyright (C) 2019 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 _INCLUDE__RAM_FS__PARAM_H_
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#define _INCLUDE__RAM_FS__PARAM_H_
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/* Genode includes */
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#include <base/stdint.h>
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namespace Ram_fs
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{
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using Genode::size_t;
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/*
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* Let number of level-0 and level-1 entries depend on the machine-word
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* size to allow the use of more than 2 GiB on 64-bit machines.
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*
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* 32 bit: 64*64*128*4096 = 2 GiB
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* 64 bit: 128*128*128*4096 = 8 GiB
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*/
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static constexpr size_t num_level_0_entries()
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{
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return sizeof(size_t) == 8 ? 128 : 64;
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}
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static constexpr size_t num_level_1_entries() { return num_level_0_entries(); }
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static constexpr size_t num_level_2_entries() { return 128; }
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static constexpr size_t num_level_3_entries() { return 4096; }
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}
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#endif /* _INCLUDE__RAM_FS__PARAM_H_ */
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