MIPS_PRID_REV
model = MIPS_PRID_REV(mips_options.mips_cpu_id);
#define MIPS_PRID_REV_MIN(x) ((MIPS_PRID_REV(x) >> 0) & 0x0f)
#define MIPS_PRID_REV_MAJ(x) ((MIPS_PRID_REV(x) >> 4) & 0x0f)
MIPS_PRID_REV(cpu_id) != ct->cpu_rev)
aprint_normal(" Rev. %d", MIPS_PRID_REV(cpu_id));
aprint_normal(" Rev. %d", MIPS_PRID_REV(fpu_id));
rev = MIPS_PRID_REV(cpu_id);