Bring back LX zones.

@@ -378,11 +378,11 @@
 #define APIC_SPUR_INTR          0xFF
 
 /* special or reserve vectors */
 #define APIC_CHECK_RESERVE_VECTORS(v) \
         (((v) == T_FASTTRAP) || ((v) == APIC_SPUR_INTR) || \
-        ((v) == T_SYSCALLINT) || ((v) == T_DTRACE_RET))
+        ((v) == T_SYSCALLINT) || ((v) == T_DTRACE_RET) || ((v) == 0x80))
 
 /* cmos shutdown code for BIOS                                          */
 #define BIOS_SHUTDOWN           0x0a
 
 /* define the entry types for BIOS information tables as defined in PC+MP */