https://docs.oracle.com/cd/E88353_01/html/E37855/ddi-peekd-9f.html
ddi_peekd - man pages section 9: DDI and DKI Kernel Functions
ddi_peek , ddi_peek8 , ddi_peek16 , ddi_peek32 , ddi_peek64 , ddi_peekc , ddi_peeks , ddi_peekl , ddi_peekd - read a value from a location
man pagesddisectiondkikernel