CST_IEc           142 kern/arch/mips/thread/cpu.c         x |= CST_IEc;
CST_IEc           155 kern/arch/mips/thread/cpu.c         x &= ~(uint32_t)CST_IEc;
CST_IEc           169 kern/arch/mips/thread/cpu.c         xon = x | CST_IEc;
CST_IEc           170 kern/arch/mips/thread/cpu.c         xoff = x & ~(uint32_t)CST_IEc;