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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@ -10,7 +10,7 @@
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// register -- and this thread polls.
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//
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// Nothing here names a driver. Interfaces come from the netdev class
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// (include/netdev.h): every bound network device is attached, and a machine
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// (include/dev/netdev.h): every bound network device is attached, and a machine
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// with two NICs gets two interfaces without a line changing in this file.
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//
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// Polling costs a wakeup every few milliseconds when the link is idle. The
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@ -18,14 +18,14 @@
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// later; it is deliberately not the first version, because a receive path that
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// is woken from an interrupt is much harder to debug than one that is asked.
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#include "types.h"
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#include "defs.h"
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#include "param.h"
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#include "spinlock.h"
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#include "sleeplock.h"
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#include "proc.h"
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#include "device.h"
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#include "netdev.h"
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#include "core/types.h"
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#include "core/defs.h"
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#include "core/param.h"
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#include "core/spinlock.h"
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#include "core/sleeplock.h"
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#include "core/proc.h"
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#include "dev/device.h"
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#include "dev/netdev.h"
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#include "lwip/opt.h"
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#include "lwip/init.h"
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