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Re-organize the source tree as a monorepo mirroring the FHS

Browse Source 
The source layout now mirrors the runtime filesystem hierarchy
(docs/danos-file-system-hierarchy-FSH.md): what lives under system/ in the
source is what a running danos represents under /system. Each service and
driver is a sub-project directory that is its own Zig module — cross-project
references go by module name, never by a path into another project's files.

Moves (all git mv, history preserved):
- src/            -> system/            (danos internals; the self-representation)
    root.zig      -> danos.zig          (the kernel<->user contract module)
    kernel/arch/  -> kernel/architecture/   (arch -> architecture)
    device/       -> devices/           (what /system/devices reflects)
    boot/         -> /boot              (the loaders, top level)
- sbin/           -> split by role:
    init, vfs     -> system/services/<name>/<name>.zig
    hpetd, busd   -> system/drivers/<name>/<name>.zig
    vfs-test      -> system/services/vfs/vfs-test.zig  (inside the vfs project)
- lib/            -> library/runtime/   (room for other libraries beside runtime)

The VFS wire protocol becomes its own module, system/services/vfs/protocol.zig
("vfs-protocol"): the vfs sub-project exposes its interface, and the runtime's
file layer imports it by name. First instance of the "protocol module" pattern
(docs/driver-model.md); usb/block will expose theirs the same way.

Also: fix a naming-standard violation in the protocol — Op -> Operation (and
req -> request, _pad -> _padding). Docs updated: /system/services added to the
FHS doc, a repository-layout section added to the docs index, and stale source
paths swept across comments and docs.

Runtime boot paths are unchanged (the bootloader still loads /sbin/init);
aligning the runtime filesystem to the FHS is a separate follow-up. Suite 35/35
plus host tests green.
This commit is contained in:
Daniel Samson
2026-07-10 12:55:56 +01:00
parent 15b70856c9
commit 8754d4e46a
83 changed files with 334 additions and 177 deletions
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docs/drivers.md
+4 -4
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@@ -22,7 +22,7 @@ say.*
## The capability: claim before touch
The five driver syscalls (`src/root.zig`, dispatched in `src/kernel/process.zig`):
The five driver syscalls (`system/danos.zig`, dispatched in `system/kernel/process.zig`):
| # | Call | Meaning |
|---|------|---------|
@@ -138,7 +138,7 @@ Two properties worth knowing:
## A whole driver
`sbin/hpetd.zig` is ~150 lines and does all of it. The shape:
`system/drivers/hpetd/hpetd.zig` is ~150 lines and does all of it. The shape:
```zig
const hpet = findHpet(buf) orelse return; // device_enumerate, look for
@@ -206,7 +206,7 @@ bus driver may only ever subdivide what it already owns.
A device with **no resources** is legal and common. A USB device is reached through its
controller, not by MMIO, so it gets `resource_count = 0`.
See [`sbin/busd.zig`](../sbin/busd.zig) for a complete one, and
See [`system/drivers/busd/busd.zig`](../system/drivers/busd/busd.zig) for a complete one, and
[driver-model.md](driver-model.md) for how bus drivers, class drivers and host
controller drivers fit together.
@@ -265,7 +265,7 @@ Worth knowing before you write the second driver:
level-triggered redirection entry with remote-IRR set doesn't clear it on some
chipsets, and the line never fires again. QEMU clears it on EOI regardless, so the
tests can't see this. Linux flushes remote-IRR by toggling the entry to edge and
back. See the note at the top of `src/kernel/irq.zig`.
back. See the note at the top of `system/kernel/irq.zig`.
## Verifying it