Implement ArGetCpuFlags() routine

xtoskrnl/ar/amd64/cpufunc.c

@@ -82,6 +82,30 @@ ArFlushTlb(VOID)
     ArWriteControlRegister(3, ArReadControlRegister(3));
 }
 
+/**
+ * Gets the RFLAGS register.
+ *
+ * @return This routine returns the RFLAGS register.
+ *
+ * @since XT 1.0
+ */
+XTCDECL
+ULONG
+ArGetCpuFlags(VOID)
+{
+    ULONG Flags;
+
+    /* Get RFLAGS register */
+    asm volatile("pushf\n"
+                 "pop %0\n"
+                 : "=rm" (Flags)
+                 :
+                 : "memory");
+
+    /* Return flags */
+    return Flags;
+}
+
 /**
  * Gets the address of the current stack register.
  *