Daniel Samson
0a8c81b17a
Add lib/ — the shared user-space runtime every user binary links against (init now, servers/drivers later): syscall wrappers, the heap, IPC stub, and the process start shim. - lib/heap.zig: the kernel first-fit free-list ported to user space, grown via the mmap syscall instead of pmm+mapPage. Dual API over one global free list: extern "C" malloc/free/calloc/realloc (C ABI for future C code) and a std.mem.Allocator adapter (with in-place resize) for Zig std containers. - lib/syscall.zig + sys.zig: raw syscall0..5 (arg3 in r10) and typed yield/write/sleep/exit/mmap/munmap over danos.Syscall. - lib/start.zig: naked _start -> rt_start -> root.main() (SysV realign via call), panic -> exit(127). - lib/user.ld: the user link script, moved from sbin/linker.ld (shared by all user binaries). - build.zig: register the `rt` module; add an addUserBinary() helper that is the one recipe for every user binary (freestanding, .large, use_lld, user.ld, image_base), replacing the bespoke init block. - sbin/init.zig: migrated onto rt; drops its hand-rolled syscall2/shims. Now proves the heap (alloc -> write from a heap pointer -> free) before the heartbeat loop. Serial shows "init: heap ok". Suite 28/28.
16 lines
651 B
Zig
16 lines
651 B
Zig
//! User-space IPC helpers. The kernel's synchronous IPC syscalls
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//! (create_endpoint, ipc_register/lookup, ipc_call, ipc_reply_wait) arrive in a
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//! later milestone; this reserves the module boundary now so drivers and servers
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//! can be written against `rt.ipc` without restructuring once they light up.
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/// A fixed-size, register-friendly message payload. The wire format for the VFS
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/// and driver protocols is layered on top of this by the servers themselves.
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pub const Message = extern struct {
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tag: u64 = 0,
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a: u64 = 0,
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b: u64 = 0,
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c: u64 = 0,
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};
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// call() / replyWait() / createEndpoint() land with the kernel IPC syscalls.
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