SMP_CPUID_REG     178 arch/mips/include/asm/thread_info.h #define SMP_CPUID_REG		20, 0	/* XCONTEXT */
SMP_CPUID_REG     182 arch/mips/include/asm/thread_info.h #define SMP_CPUID_REG		4, 0	/* CONTEXT */