MSR_OS_MAILBOX_INTERFACE
if (rdmsrq_safe(MSR_OS_MAILBOX_INTERFACE, &data) ||
ret = rdmsrq_safe(MSR_OS_MAILBOX_INTERFACE, &data);
rdmsrq(MSR_OS_MAILBOX_INTERFACE, data);
wrmsrq(MSR_OS_MAILBOX_INTERFACE, data);
rdmsrq(MSR_OS_MAILBOX_INTERFACE, data);