diff --git a/src/arch/aarch64/consts.rs b/src/arch/aarch64/consts.rs
index d3834ef..fdc9b44 100644
--- a/src/arch/aarch64/consts.rs
+++ b/src/arch/aarch64/consts.rs
@@ -38,8 +38,8 @@
     pub const KERNEL_TMP_MISC_OFFSET: usize = KERNEL_ENV_OFFSET - PML4_SIZE;
 
     /// Offset to kernel percpu variables
-    //TODO: Use 64-bit fs offset to enable this pub const KERNEL_PERCPU_OFFSET: usize = KERNEL_HEAP_OFFSET - PML4_SIZE;
     pub const KERNEL_PERCPU_OFFSET: usize = KERNEL_TMP_MISC_OFFSET - PML4_SIZE;
+    pub const KERNEL_PERCPU_PML4: usize = (KERNEL_PERCPU_OFFSET & PML4_MASK) / PML4_SIZE;
 
     /// Size of kernel percpu variables
     pub const KERNEL_PERCPU_SIZE: usize = 64 * 1024; // 64 KB