include: one folder per subsystem, and includes that name it
Sixty-five headers sat side by side in include/, so `#include "irq.h"` said nothing about where irq.h was or what it belonged to, and errno.h, stat.h and fcntl.h at the top shadowed the system's for any host tool built with -I./include. They are in folders now -- arch/ core/ fs/ dev/ gfx/ net/ uapi/ (and ldls/ for the Linux driver layer) -- and every include names the folder, as Linux's do: "core/proc.h". Done mechanically and checked the hard way: the kernel built from this tree disassembles identically to the one built from the tree before it. The full image boots, and userland is the same set of programs. Paths in docs and comments follow; docs/guides/layout.md has a table of what is where, and tools/fix-includes.py rewrites old-style includes from the folders in the tree, for code written before this. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01S1giNvrHTrPMPw7V6x1kQ4
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// Deliberately not a WAV player. A player has to parse a header, and a header
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// is a second thing to get wrong while testing the first.
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#include "types.h"
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#include "user.h"
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#include "fcntl.h"
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#include "audio.h"
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#include "errno.h"
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#include "core/types.h"
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#include "uapi/user.h"
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#include "uapi/fcntl.h"
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#include "dev/audio.h"
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#include "uapi/errno.h"
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// A quarter-amplitude sine, from a table rather than a libm that does not
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// exist here. 64 points is audibly a sine and arithmetically exact.
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