SYS_PMSICR_EL1
{ SYS_DESC(SYS_PMSICR_EL1), undef_access },
write_sysreg_s(reg, SYS_PMSICR_EL1);
local64_set(&hwc->period_left, read_sysreg_s(SYS_PMSICR_EL1));