rmm: Make a couple more methods safe

src/acpi/madt/arch/x86.rs

@@ -134,9 +134,7 @@ pub(super) fn init(madt: Madt) {
                     hint::spin_loop();
                 }
 
-                unsafe {
-                    RmmA::invalidate_all();
-                }
+                RmmA::invalidate_all();
             }
         }
     }

src/context/mod.rs

@@ -90,7 +90,7 @@ pub fn init(token: &mut CleanLockToken) {
     context.name.clear();
     context.name.push_str("[kmain]");
 
-    self::arch::EMPTY_CR3.call_once(|| unsafe { RmmA::table(TableKind::User) });
+    self::arch::EMPTY_CR3.call_once(|| RmmA::table(TableKind::User));
 
     context.status = Status::Runnable;
     context.running = true;

src/percpu.rs

@@ -116,9 +116,7 @@ impl PercpuBlock {
         }
 
         // TODO: Finer-grained flush
-        unsafe {
-            crate::paging::RmmA::invalidate_all();
-        }
+        crate::paging::RmmA::invalidate_all();
 
         if let Some(addrsp) = &*self.current_addrsp.borrow() {
             addrsp.tlb_ack.fetch_add(1, Ordering::Release);