diff --git a/src/register/ustatus.rs b/src/register/ustatus.rs
index d450611..81890ba 100644
--- a/src/register/ustatus.rs
+++ b/src/register/ustatus.rs
@@ -2,8 +2,6 @@
 // TODO: Virtualization, Memory Privilege and Extension Context Fields
 
 use bit_field::BitField;
-use core::mem::size_of;
-pub use super::mstatus::{XS, FS};
 
 /// ustatus register
 #[derive(Clone, Copy, Debug)]
@@ -23,45 +21,8 @@ impl Ustatus {
     pub fn upie(&self) -> bool {
         self.bits.get_bit(4)
     }
-
-    /// Floating-point extension state
-    ///
-    /// Encodes the status of the floating-point unit,
-    /// including the CSR `fcsr` and floating-point data registers `f0–f31`.
-    #[inline]
-    pub fn fs(&self) -> FS {
-        match self.bits.get_bits(13..15) {
-            0b00 => FS::Off,
-            0b01 => FS::Initial,
-            0b10 => FS::Clean,
-            0b11 => FS::Dirty,
-            _ => unreachable!(),
-        }
-    }
-
-    /// Additional extension state
-    ///
-    /// Encodes the status of additional user-mode extensions and associated state.
-    #[inline]
-    pub fn xs(&self) -> XS {
-        match self.bits.get_bits(15..17) {
-            0b00 => XS::AllOff,
-            0b01 => XS::NoneDirtyOrClean,
-            0b10 => XS::NoneDirtySomeClean,
-            0b11 => XS::SomeDirty,
-            _ => unreachable!(),
-        }
-    }
-
-    /// Whether either the FS field or XS field
-    /// signals the presence of some dirty state
-    #[inline]
-    pub fn sd(&self) -> bool {
-        self.bits.get_bit(size_of::<usize>() * 8 - 1)
-    }
 }
 
-
 read_csr_as!(Ustatus, 0x000, __read_ustatus);
 write_csr!(0x000, __write_ustatus);
 set!(0x000, __set_ustatus);