Merge pull request #373 from prinzdezibel/master

Provide null segment selector as associated constant on SegmentSelector
rust-osdev · Apr 12, 2022 · 3cae23e · 3cae23e
2 parents 8922d8d + 3959a0b
commit 3cae23e
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/src/registers/segmentation.rs b/src/registers/segmentation.rs
@@ -77,6 +77,10 @@ impl SegmentSelector {
         SegmentSelector(index << 3 | (rpl as u16))
     }
 
+    /// Can be used as a selector into a non-existent segment and assigned to segment registers,
+    /// e.g. data segment register in ring 0
+    pub const NULL: Self = Self::new(0, PrivilegeLevel::Ring0);
+
     /// Returns the GDT index.
     #[inline]
     pub fn index(self) -> u16 {