mirror of
https://github.com/genodelabs/genode.git
synced 2024-12-22 15:02:25 +00:00
43 lines
1.0 KiB
C++
43 lines
1.0 KiB
C++
/*
|
|
* \brief Dimensioning of the hierarchic 'Chunk' structure for the RAM fs
|
|
* \author Norman Feske
|
|
* \date 2019-03-17
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2019 Genode Labs GmbH
|
|
*
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
* under the terms of the GNU Affero General Public License version 3.
|
|
*/
|
|
|
|
#ifndef _INCLUDE__RAM_FS__PARAM_H_
|
|
#define _INCLUDE__RAM_FS__PARAM_H_
|
|
|
|
/* Genode includes */
|
|
#include <base/stdint.h>
|
|
|
|
namespace Ram_fs
|
|
{
|
|
using Genode::size_t;
|
|
|
|
/*
|
|
* Let number of level-0 and level-1 entries depend on the machine-word
|
|
* size to allow the use of more than 2 GiB on 64-bit machines.
|
|
*
|
|
* 32 bit: 64*64*128*4096 = 2 GiB
|
|
* 64 bit: 128*128*128*4096 = 8 GiB
|
|
*/
|
|
static constexpr size_t num_level_0_entries()
|
|
{
|
|
return sizeof(size_t) == 8 ? 128 : 64;
|
|
}
|
|
|
|
static constexpr size_t num_level_1_entries() { return num_level_0_entries(); }
|
|
static constexpr size_t num_level_2_entries() { return 128; }
|
|
static constexpr size_t num_level_3_entries() { return 4096; }
|
|
}
|
|
|
|
#endif /* _INCLUDE__RAM_FS__PARAM_H_ */
|
|
|