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

crates/types/src/syscall_abi.rs

@@ -41,6 +41,8 @@ pub const SYS_SET_IRQ_NOTIFICATION: usize = 32;
 pub const SYS_CREATE_REGION: usize = 33;
 pub const SYS_MAP_REGION: usize = 34;
 pub const SYS_REGION_ADDRESS: usize = 35;
+pub const SYS_WATCH_DEATH: usize = 36;
+pub const SYS_SET_TIMER: usize = 37;
 
 /// `PagePerms` in a register.
 pub const PERMS_READ_ONLY: usize = 0;

crates/types/src/time.rs

@@ -15,9 +15,6 @@ impl Ticks {
     }
 }
 
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub struct TimerDuration(u32);
-
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub struct TimeSlice {
     remaining: u32,