SSDT and SSTD shadow
!idt
dps nt!KeServiceDescriptorTable
dds KiServiceTable
dq KiServiceTable
ln poi(KiServiceTable + 102 * 4)
Hooking the System Service Dispatch Table (SSDT)
External Reading
Binary Number Wiki
https://www.mathsisfun.com/binary-number-system.html
https://www.mathsisfun.com/binary-digits.html