diff --git a/src/hulk/cpu.d b/src/hulk/cpu.d
index ec51941..f39aec6 100644
--- a/src/hulk/cpu.d
+++ b/src/hulk/cpu.d
@@ -216,6 +216,14 @@ void write_cr4(ulong v)
     __asm("mov $0, %cr4", "r", v);
 }
 
+ulong read_rflags()
+{
+    return __asm!ulong(`
+            pushf
+            mov (%rsp), %rax
+            add $$8, %rsp`, "={rax}");
+}
+
 ulong rdmsr(uint msr)
 {
     return __asm!ulong(`