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Add some documentation

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This commit is contained in:
Jeremy Soller 2016-11-03 20:29:19 -06:00
parent 59349a7d5c
commit cab27d0f67
3 changed files with 20 additions and 3 deletions
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8
kernel/lib.rs
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@ -125,21 +125,27 @@ pub mod syscall;
#[cfg(test)]
pub mod tests;
/// A unique number that identifies the current CPU - used for scheduling
#[thread_local]
static CPU_ID: AtomicUsize = ATOMIC_USIZE_INIT;
/// Get the current CPU's scheduling ID
#[inline(always)]
pub fn cpu_id() -> usize {
CPU_ID.load(Ordering::Relaxed)
}
/// The count of all CPUs that can have work scheduled
static CPU_COUNT : AtomicUsize = ATOMIC_USIZE_INIT;
/// Get the number of CPUs currently active
#[inline(always)]
pub fn cpu_count() -> usize {
CPU_COUNT.load(Ordering::Relaxed)
}
/// Initialize userspace by running the initfs:bin/init process
/// This function will also set the CWD to initfs:bin and open debug: as stdio
pub extern fn userspace_init() {
assert_eq!(syscall::chdir(b"initfs:bin"), Ok(0));
@ -165,6 +171,7 @@ pub extern fn ksignal(signal: usize) {
}
}
/// This is the kernel entry point for the primary CPU. The arch crate is responsible for calling this
#[no_mangle]
pub extern fn kmain(cpus: usize) {
CPU_ID.store(0, Ordering::SeqCst);
@ -198,6 +205,7 @@ pub extern fn kmain(cpus: usize) {
}
}
/// This is the main kernel entry point for secondary CPUs
#[no_mangle]
pub extern fn kmain_ap(id: usize) {
CPU_ID.store(id, Ordering::SeqCst);