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Make zig-out a FHS image, and the boot volume

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`zig build` now installs into a FHS-shaped zig-out that *is* the danos filesystem
and the boot volume — no more zig-out/bin or a separate esp/:

  zig-out/EFI/BOOT/BOOTX64.efi        (firmware entry; UEFI fixes this path)
  zig-out/boot/initial-ramdisk.img
  zig-out/system/kernel               (the kernel binary)
  zig-out/system/services/init  vfs
  zig-out/system/drivers/hpet   bus

Binaries land at their addressed, leaf-collapsed paths per the sub-project
resolution rule (system/services/init/init.zig -> system/services/init); vfs, hpet,
and bus are installed to their FHS homes too, so the image is complete even though
at boot they arrive inside the initial-ramdisk.

The bootloader (boot/efi.zig) now loads each artifact from its FHS path
(system\kernel, system\services\init, boot\initial-ramdisk.img); run-x86-64 mounts
zig-out directly; the QEMU test harness assembles its ESP from the FHS zig-out.

Also renames system/kernel/main.zig -> kernel.zig so the kernel follows the
name/name.zig convention (kernel/ = ring-0 code, services/ = ring-3 OS services).
Documents the resolution rule in the repository-layout section (README + coding
standard). Suite 35/35 plus host tests green.
This commit is contained in:
Daniel Samson
2026-07-10 13:57:02 +01:00
parent ceacc6b514
commit 3d1de37d0e
10 changed files with 103 additions and 62 deletions
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README.md
+4 -2
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@@ -30,8 +30,10 @@ channels. See [`docs/`](docs/README.md) for how each piece works.
zig build
```
Produces the UEFI bootloader (`zig-out/bin/BOOTX64.efi`) and the kernel ELF
(`zig-out/bin/kernel`).
Produces a FHS-shaped `zig-out/` that *is* the danos filesystem and the boot volume:
the UEFI bootloader at `zig-out/EFI/BOOT/BOOTX64.efi`, the kernel at
`zig-out/system/kernel`, init at `zig-out/system/services/init`, drivers under
`zig-out/system/drivers/`, and the initial-ramdisk at `zig-out/boot/`.
## Run