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include: one folder per subsystem, and includes that name it

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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
This commit is contained in:
Nexoniarz 2026-10-23 15:05:12 +02:00
commit a1c965da1e
267 changed files with 1560 additions and 1440 deletions
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6
docs/architecture/kernel.md
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@ -108,7 +108,7 @@ one per-CPU block and everything that changes per CPU belongs in it.
> calls. But `%fs` here is per *CPU*, and a kernel thread changes CPU at every
> `sched()`. So the assumption is false for exactly the variables that most need
> to be right, and the failure is a null dereference deep in the scheduler on any
> machine with more than one core. `include/proc.h` carries the disassembly that
> machine with more than one core. `include/core/proc.h` carries the disassembly that
> proves it.
## Memory
@ -119,7 +119,7 @@ no buddy system, no zones, no page-frame database.
### Small objects
`kernel/core/kmem.c`, `include/kmem.h`. A slab is one page from `kalloc()` with
`kernel/core/kmem.c`, `include/core/kmem.h`. A slab is one page from `kalloc()` with
a header at the front and objects packed after it; free objects hold the free
list in their own first eight bytes.
@ -196,7 +196,7 @@ contiguous multi-page allocator, which is a separate thing and is not written.
## Processes
`struct proc` in [`include/proc.h`](../../include/proc.h). A fixed table of
`struct proc` in [`include/core/proc.h`](../../include/proc.h). A fixed table of
`NPROC` entries, allocated by linear scan.
**The field order at the top of the struct is fixed by assembly.** `trapasm.S`