feat: add Platform::map_shared and wire memory delegation to page mapping

crates/kernel/src/tests/mock_platform.rs

@@ -2,8 +2,10 @@ use domain::memory::MemoryRegion;
 use domain::thread::SavedContext;
 use platform::Platform;
 use types::{
-    address::{EntryPoint, StackPointer},
+    address::{EntryPoint, PhysicalAddress, StackPointer},
+    bounded::PageCount,
     id::{CoreId, IrqId, ProcessId},
+    permission::PermissionSet,
     time::{Ticks, TimerDuration},
 };
 
@@ -46,4 +48,12 @@ impl Platform for MockPlatform {
     fn num_cores(&self) -> u8 {
         self.cores
     }
+    fn map_shared(
+        &mut self,
+        _process: ProcessId,
+        _base: PhysicalAddress,
+        _size: PageCount,
+        _permissions: PermissionSet,
+    ) {
+    }
 }