KERNEL_CODE_SELECTOR
= (KERNEL_CODE_SELECTOR << 16) | (0x0000ffff & (addr_t)function);
tss->cs = KERNEL_CODE_SELECTOR;
gate1 = (KERNEL_CODE_SELECTOR << 16) | (0x0000ffff & addr);
x86_write_msr(IA32_MSR_SYSENTER_CS, KERNEL_CODE_SELECTOR);
fSelector(KERNEL_CODE_SELECTOR),
x86_write_msr(IA32_MSR_SYSENTER_CS, KERNEL_CODE_SELECTOR);
| ((uint64)(KERNEL_CODE_SELECTOR) << 32));