1 files changed, 28 insertions, 22 deletions

diff --git a/rtic/src/export/cortex_source_mask.rs b/rtic/src/export/cortex_source_mask.rs
index 9dec5c7..4fb62a4 100644
--- a/rtic/src/export/cortex_source_mask.rs
+++ b/rtic/src/export/cortex_source_mask.rs
@@ -127,25 +127,27 @@ pub unsafe fn lock<T, R, const M: usize>(
     masks: &[Mask<M>; 3],
     f: impl FnOnce(&mut T) -> R,
 ) -> R {
-    if ceiling >= 4 {
-        // safe to manipulate outside critical section
-        // execute closure under protection of raised system ceiling
-
-        // safe to manipulate outside critical section
-        critical_section::with(|_| f(&mut *ptr))
-    } else {
-        // safe to manipulate outside critical section
-        let mask = compute_mask(0, ceiling, masks);
-        let old_mask = read_mask(mask);
-        clear_enable_mask(mask);
-
-        // execute closure under protection of raised system ceiling
-        let r = f(&mut *ptr);
-
-        set_enable_mask(mask, old_mask);
-
-        // safe to manipulate outside critical section
-        r
+    unsafe {
+        if ceiling >= 4 {
+            // safe to manipulate outside critical section
+            // execute closure under protection of raised system ceiling
+
+            // safe to manipulate outside critical section
+            critical_section::with(|_| f(&mut *ptr))
+        } else {
+            // safe to manipulate outside critical section
+            let mask = compute_mask(0, ceiling, masks);
+            let old_mask = read_mask(mask);
+            clear_enable_mask(mask);
+
+            // execute closure under protection of raised system ceiling
+            let r = f(&mut *ptr);
+
+            set_enable_mask(mask, old_mask);
+
+            // safe to manipulate outside critical section
+            r
+        }
     }
 }
 
@@ -187,7 +189,7 @@ unsafe fn read_mask<const M: usize>(mask: Mask<M>) -> Mask<M> {
     for i in 0..M {
         // This check should involve compile time constants and be optimized out.
         if mask.0[i] != 0 {
-            out.0[i] = (*NVIC::PTR).iser[i].read();
+            out.0[i] = unsafe { (*NVIC::PTR).iser[i].read() };
         }
     }
 
@@ -200,7 +202,9 @@ unsafe fn set_enable_mask<const M: usize>(mask: Mask<M>, old_mask: Mask<M>) {
     for i in 0..M {
         // This check should involve compile time constants and be optimized out.
         if mask.0[i] != 0 {
-            (*NVIC::PTR).iser[i].write(old_mask.0[i]);
+            unsafe {
+                (*NVIC::PTR).iser[i].write(old_mask.0[i]);
+            }
         }
     }
 }
@@ -211,7 +215,9 @@ unsafe fn clear_enable_mask<const M: usize>(mask: Mask<M>) {
     for i in 0..M {
         // This check should involve compile time constants and be optimized out.
         if mask.0[i] != 0 {
-            (*NVIC::PTR).icer[i].write(mask.0[i]);
+            unsafe {
+                (*NVIC::PTR).icer[i].write(mask.0[i]);
+            }
         }
     }
 }