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SchOS/.claude/memory/MEMORY.md
Nexoniarz 26bca020b6 licence: SchOS is GPL-2.0-or-later, no longer Apache-2.0 
Nexoniarz is the sole author and SchOS was never published under
Apache-2.0, so this is a straight relicence. LICENSE is the FSF GPLv2 text,
every first-party SPDX header moves to GPL-2.0-or-later, and NOTICE,
README.md, docs/licensing.md and the site say so. projects/schfs-linux
follows the rest of the tree.

The GPL gives copyleft: a fork has to ship its source. It also lifts the
old "Linux drivers, never" rule, since GPL-2.0-only code combines with
GPL-2.0-or-later. "Or later" leaves room for GPLv3, but one binary still
has to pick one version, so docs/licensing.md now keeps Apache-2.0 and
GPLv3 code out of the kernel to keep Linux code possible there. BSD
4-clause code goes from "avoid" to "no", because the advertising clause
is GPL-incompatible.

LDLS still ships no .ko. That boundary is now project policy rather than
a legal requirement, and ldls.md, devices.md and licensing.md section 6
say so. refmod declares license=GPL, and ldls-check passes (27 checks).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-10-22 08:48:45 +02:00

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- [SchOS rename + git](schos-rename-and-git.md) — Schunix is SchOS and the kernel is SchIFT; the tree is under local git, and the two bugs the rename caused.
- [Cross-platform build](schos-cross-platform-build.md) - Windows, Linux, macOS and BSD all build it; clang everywhere, and the four host assumptions that used to break.
- [Memory sync](schos-memory-sync.md) - memory lives in the repo at .claude/memory/; tools/memory-sync.sh moves it between machines.
- [The Linux machine](schos-linux-machine.md) - Fedora laptop at /home/nexoniarz/Documents/SchOS; the three things only it can test, all now green.
- [Bugs the Fedora move exposed](schos-fedora-move-bugs.md) - mkfs.c's DT_* ordering, and a stack walker that page-faulted on an all-ones frame pointer.
- [Performance and init](schos-performance-and-init.md) - BSIZE must equal SCHFS_BLKSIZE (4-34x), and why Ctrl-C could kill pid 1.
- [Trusting bootcheck](schos-bootcheck-trust.md) - it silently stopped running; count the [ok] lines, never just grep FAIL.
- [schinit](schos-schinit.md) - process 1 is launchd-shaped; job manifests, and why setsid() cost the shell its terminal.
- [BIOS/UEFI split](schos-boot-split.md) - boot/bios and boot/uefi, and the hand-off contract a second loader must satisfy.
- [UEFI loader](schos-uefi-loader.md) - it boots to an interactive shell now; the SCH64 entry, the GDT trap, and the four bugs that stood in the way.
- [ioremap and BARs](schunix-ioremap-and-bars.md) - never P2V a BAR; firmware puts 64-bit BARs far above the direct map.
- [Schunix build environment](schunix-build-environment.md) — builds natively on Windows with clang/lld + mingw + Git Bash; WSL is gone, and the five latent bugs the move exposed.
- [Syscalls: one table](schunix-syscall-single-table.md) — declare in kernel/sys/table.inc only; linux_abi.c is generated, never hand-edited.
- [Linux ABI decision](schunix-linux-abi-decision.md) — the native syscall ABI is being dropped; Linux numbering becomes the only ABI.
- [Rewrite priorities](schunix-rewrite-priorities.md) — what actually blocks the OS, in order, plus a confirmed SMP bug in the syscall entry path.
- [SMP and RAM-floor bugs](schunix-smp-and-memory-bugs.md) — SMP works (five bugs, and why __thread is wrong for per-CPU data); the 224 MB floor is gone.
- [SchFS and ramdisk root](schfs-v2-and-ramdisk.md) — the agreed BeFS/ZFS/btrfs synthesis, and the completed `make ramroot` + mkfs dedup work.
- [SchFS B-tree, phase 1](schfs-btree-phase1.md) — the CoW B-tree is built and passing; run `make schfs-test` after touching it.
- [SchFS phase 2: real mount](schfs-phase2-mount.md) — mkschfs writes images, the kernel mounts them read-only; `make schfs-check`, plus four traps worth remembering.
- [SchFS phase 3: writes](schfs-phase3-writes.md) — full write API, free map derived not stored, and `mount -t schfs` works; the VFS now dispatches through `struct fs_ops`.
- [DIRSIZ 14 -> 30](schunix-dirsiz-14.md) — filenames used to truncate silently; fixed by holding the HTree bucket at 256 bytes.
- [Linux open flags](schunix-linux-open-flags.md) — include/fcntl.h must hold Linux's values; a mismatch made `>>` truncate.
- [Shared memory and mmap](schunix-shm-and-mmap.md) — shm + file-backed mmap work; pages you don't own must never reach kfree.
- [Wall clock](schunix-wall-clock.md) — the RTC was never read, so `date` said 1970; kernel/core/time.c fixes it, plus the stale-image trap.
- [TTF rasteriser](schunix-ttf-rasteriser.md) — glyf outlines (not CFF, and why); the composite-glyph trap that loses the letter "i".
- [Text rendering](schunix-text-rendering.md) — the layer replacing the 8x16 cell grid; metrics, surfaces, coverage blending, UTF-8.
- [Console and TTY](schunix-console-tty.md) — ANSI parser, termios, UTF-8; the font is CP437 not Latin-1, plus five bugs that masqueraded as broken commands.
- [Build speed](schunix-build-speed.md) — no-op make is ~2s now; what made it 1m48 and the traps that would undo it.
- [PCI and drivers](schunix-pci-drivers.md) — bus enumeration, and where a driver that finds its own hardware goes.
- [ISO boot](schunix-iso-boot.md) — `make iso`; needs El Torito no-emulation + ATAPI because the loader never uses INT 13h.
- [Ramdisk root sizing](schunix-ramdisk-root-sizing.md) — the "disk full" was DOOM WADs, not FSSIZE; three Makefile knobs, and why excluding them is a licensing rule.
- [Framebuffer device](schunix-framebuffer-device.md) — /dev/fb0 is real and speaks Linux fbdev; never assume where the framebuffer lives.
- [Crash screen](schunix-crash-screen.md) — PSOGM lives in kernel/core/panic.c; `echo c > /proc/sysrq` to trigger, `make crashshot` to photograph.
- [QR encoder](schunix-qr-encoder.md) — kernel/core/qr.c for crash reports; `make qrcheck`, and the segno padding bug that is not ours.
- [Boot splash and logo](schunix-boot-splash-logo.md) — the loader draws the logo, not the kernel; STAGE2_SECTORS was in five places and is now in one.
- [SchAPI direction](schunix-schapi-direction.md) — Schunix as a macOS-shaped *system*; the stable ABI is a library, not the syscall table.
- [Schcom v0](schcom-v0.md) - the compositor runs; Wayland-shaped, verified by checking pixels from the host.
- [SchFS next + platform roadmap](schfs-next-and-platform-roadmap.md) - snapshots/scrub/compression/encryption, one home for the format, a unified loader, audio; and the 614 MB ceiling that was fixed.
- [Roadmap and projects/](schunix-roadmap-and-projects.md) — the agreed order through to Schcom/SchWM/SchDE; the GUI and installer live outside the OS tree.
- [Driver infrastructure](schunix-driver-infrastructure.md) — dynamic IRQ registration, a DMA arena, PCI capabilities; PCI interrupts are level/active-low.
- [Network stack choice](schunix-network-stack-choice.md) — don't write TCP; lwIP over FreeBSD over NetBSD, with the licence evidence.
- [e1000 and driver layout](schunix-e1000-and-driver-layout.md) — the NIC driver, drivers/ split by device class, and virtio-gpu as the QEMU default.
- [virtio-gpu](schunix-virtio-gpu.md) — the display class's second implementation; run with `-vga std -device virtio-gpu-pci`.
- [Device model](schunix-device-model.md) — one bus-agnostic list at /proc/devices; bus is provenance, class is capability, and the settled Linux-driver decision.
- [usb.ids](schunix-usb-ids.md) — shipped as /usr/share/usb.ids, BSD option of a dual licence; cached, not fetched per build.
- [USB and xHCI](schunix-usb-xhci.md) — enumeration and control transfers work; written from the spec, because porting BSD's stack means porting newbus first.
- [Licensing](schunix-licensing.md) — GPL-2.0-or-later since 2026-10-22 (was Apache); Linux code OK, no Apache/GPLv3 in the kernel.
- [Layout migration](schunix-layout-migration.md) — the bt/ → ports/ + lib/ + cmd/ restructure and the two Makefile traps it exposed.
- [Verify by driving the shell](schunix-verify-by-driving-shell.md) — booting to a prompt proves nothing; run real commands over serial with paced input.
- [/dev and /proc](schunix-devfs-procfs.md) — how both are built; ps and top work now, one cosmetic gap left.
- [TTY foreground pgrp coupling](schunix-tty-fg-pgrp-coupling.md) — TIOCGPGRP and getpgrp() must agree or the shell spins forever; how to spot that hang.
- [Sockets and evdev](schunix-sockets-and-evdev.md) — AF_UNIX with one table lock, /dev/input/eventN, and why keycodes need a table for USB but not PS/2.
- [The removed acceptance test](schunix-doom-acceptance-test.md) — deleted 2026-08-08 with its trademark references; what it found and the two techniques worth keeping.
- [Sharing preference](nexoniarz-sharing-preference.md) — never push or publish; unfinished work stays local.
- [SMP userspace corruption](schos-smp-userspace-corruption.md) — the intermittent `rip 0x0` crash is SMP-only and still open; what is ruled out.
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