feat(kernel): WatchDeath + SetTimer events as notification signals; adapter wakes at earliest deadline

crates/adapter-riscv/src/platform.rs

@@ -4,10 +4,9 @@ use types::{
     address::{EntryPoint, PhysicalAddress, StackPointer, VirtualAddress},
     id::{CoreId, IrqId, ProcessId},
     mapping::PagePerms,
-    time::{Ticks, TimerDuration},
+    time::Ticks,
 };
 
-use crate::board;
 use crate::hw::{plic::Plic, timer};
 use crate::mmu;
 use crate::smp;
@@ -136,9 +135,8 @@ impl Platform for RiscVPlatform {
         }
     }
 
-    fn set_timer(&mut self, _duration: TimerDuration) {
-        let now = timer::read_time();
-        timer::set_next(now + board::TICK_INTERVAL);
+    fn wake_at(&mut self, deadline: Ticks) {
+        timer::wake_at(deadline.raw());
     }
 
     fn current_ticks(&self) -> Ticks {