Daniel Samson
b61b7775b9
The reorg moved user binaries under /system (init -> /system/services/init, drivers -> /system/drivers/<name>, vfs-test -> /system/services/vfs/vfs-test), but many comments and log strings still named the old /sbin/ home. Retarget them all: kernel/loader/test comments and the two boot log lines, plus vision.md and the driver-model.md proposed tree (also dropped the stale `d` suffixes and rt->runtime there). The initial-ramdisk spawn log no longer fakes a /sbin/ prefix, since those binaries live in different homes (services vs drivers). Left the FSH design doc's /sbin and /lib rows alone — whether /sbin stays a directory at all is a design call for its owner, not a stale-comment fix.
40 lines
1.8 KiB
Zig
40 lines
1.8 KiB
Zig
//! /system/services/init — the first user-space program, PID 1. Built as its own
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//! freestanding binary (see build.zig), shipped on the boot volume at /system/services/init,
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//! loaded by the bootloader, and started in ring 3 as a scheduled process by the
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//! kernel (system/kernel/process.zig). It links against the shared user runtime
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//! library `runtime` and talks to the kernel only through `runtime`'s system_call wrappers.
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//!
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//! Today it proves the C-convention heap works, then settles into a heartbeat:
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//! it prints a line and sleeps, forever — enough to show the system reaches user
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//! space and stays alive with a real process scheduled alongside the kernel's
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//! idle loop. It grows into the real init (service supervision) once there are
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//! other user programs to supervise.
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const runtime = @import("runtime");
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pub fn main() void {
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// Prove the heap end to end: allocate through the runtime allocator (which
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// mmaps pages from the kernel and carves them with the free list), write into
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// that heap buffer (exercising the widened debug_write bounds check), and
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// free it. A fault here would kill init before it heartbeats — so the init
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// test doubles as the heap regression test. (C code links the same heap via
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// the extern malloc/free symbols; Zig code uses this allocator.)
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const gpa = runtime.allocator();
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if (gpa.alloc(u8, 64)) |buffer| {
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const message = "init: heap ok\n";
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@memcpy(buffer[0..message.len], message);
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_ = runtime.system.write(buffer[0..message.len]);
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gpa.free(buffer);
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} else |_| {}
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while (true) {
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_ = runtime.system.write("init: heartbeat\n");
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runtime.system.sleep(1000);
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}
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}
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pub const panic = runtime.panic;
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comptime {
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_ = &runtime.start._start; // pull the runtime entry shim into the image
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}
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