KVM_REG_MIPS_FPR_64
index = KVM_REG_MIPS_FPR_64(i);
case KVM_REG_MIPS_FPR_64(0) ... KVM_REG_MIPS_FPR_64(31):
idx = reg->id - KVM_REG_MIPS_FPR_64(0);
case KVM_REG_MIPS_FPR_64(0) ... KVM_REG_MIPS_FPR_64(31):
idx = reg->id - KVM_REG_MIPS_FPR_64(0);