fix(kernel): fix kill wait-queue cleanup, RegionId tracking, ReleasePages ownership, and SwitchTo scheduler state

crates/domain/src/memory/mod.rs

@@ -86,6 +86,21 @@ impl RegionTable {
         self.regions.get_mut(id.raw() as usize).and_then(|s| s.take())
     }
 
+    pub fn find_by_base(
+        &self,
+        owner: ProcessId,
+        base: PhysicalAddress,
+    ) -> Option<(RegionId, &MemoryRegion)> {
+        for (i, slot) in self.regions.iter().enumerate() {
+            if let Some(region) = slot {
+                if region.owner() == owner && region.base() == base {
+                    return Some((RegionId::from_raw(i as u16), region));
+                }
+            }
+        }
+        None
+    }
+
     pub fn regions_for_process(&self, process: ProcessId) -> impl Iterator<Item = &MemoryRegion> {
         self.regions
             .iter()