SB_GLD_MSR_CTRL
msr = rdmsr(SB_GLD_MSR_CTRL);
wrmsr(SB_GLD_MSR_CTRL, msr);
sc->save_gld_msr = rdmsr(SB_GLD_MSR_CTRL);
wrmsr(SB_GLD_MSR_CTRL, sc->save_gld_msr);