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Rename the shared contract module danos -> system; QEMU logs to /var/log/system

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The shared kernel<->user ABI contract (BootInformation, the SystemCall numbers,
DeviceDescriptor, page_size, ...) is now the `system` module at
system/system.zig, following the convention that a directory's root file takes
the directory's name.

One overlap to note: the runtime's syscall wrappers are already `runtime.system`,
so the single file that uses both the contract and those wrappers
(library/runtime/heap.zig) aliases the wrappers locally as `system_calls`. The
two are distinct (top-level `system` vs `runtime.system`); everywhere else the
contract is just `system`.

Also: the QEMU run's serial capture now lands in the FHS log location,
zig-out/var/log/system/serial0-<timestamp>.log — a stand-in for the kernel's own
logging system, which will eventually write there itself.

Suite 35/35 plus host tests green.
This commit is contained in:
Daniel Samson
2026-07-10 14:09:38 +01:00
parent 3d1de37d0e
commit d19a0ae38d
38 changed files with 202 additions and 198 deletions
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docs/README.md
+2 -2
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@@ -146,7 +146,7 @@ A sub-project's extra files are reached through the module, never as separate pa
```
system/ → /system danos's own internals (the self-representation)
danos.zig the kernel↔user ABI contract (the `danos` module)
system.zig the kernel↔user ABI contract (the `system` module)
parameters.zig initial-ramdisk.zig shared contracts
kernel/ IPC, memory, scheduling, the private syscall dispatch
architecture/x86_64/ the `architecture` module (never named by generic code)
@@ -177,7 +177,7 @@ appears in the private-ABI path.
|------|------|
| Boot methods (one per way of booting the kernel) | `boot/` — `efi.zig` (UEFI) → `BOOTX64.efi` |
| Kernel entry, panic, bring-up | `system/kernel/kernel.zig` |
| Shared loader↔kernel contract (`BootInfo`, `Framebuffer`, `MemoryMap`, `Syscall`, ABI) | `system/danos.zig` |
| Shared loader↔kernel contract (`BootInfo`, `Framebuffer`, `MemoryMap`, `Syscall`, ABI) | `system/system.zig` |
| Physical frame allocator | `system/kernel/pmm.zig` |
| Kernel heap (`std.mem.Allocator`) | `system/kernel/heap.zig` |
| Scheduler (fixed-priority preemptive; blocking, wait queues) | `system/kernel/scheduler.zig` |