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Everywhere: Add serenity_dev_{makedev,major,minor}

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Add them in `<Kernel/API/Device.h>` and use these to provides
`{makedev,major,minor}` in `<sys/sysmacros.h>`. It aims to be more in
line with other Unix implementations and avoid code duplication in user
land.
This commit is contained in:
Michel Hermier 2021-11-26 16:55:45 +01:00 • committed by Andreas Kling
parent d4484f4de3
commit 69cabb3ead
7 changed files with 43 additions and 17 deletions
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30
Kernel/API/Device.h Normal file
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@ -0,0 +1,30 @@
/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Platform.h>
#include <sys/cdefs.h>
#include <sys/types.h>
__BEGIN_DECLS
ALWAYS_INLINE dev_t serenity_dev_makedev(unsigned major, unsigned minor)
{
return (minor & 0xffu) | (major << 8u) | ((minor & ~0xffu) << 12u);
}
ALWAYS_INLINE unsigned int serenity_dev_major(dev_t dev)
{
return (dev & 0xfff00u) >> 8u;
}
ALWAYS_INLINE unsigned int serenity_dev_minor(dev_t dev)
{
return (dev & 0xffu) | ((dev >> 12u) & 0xfff00u);
}
__END_DECLS