Picking at random the longest file, ./include/asic_reg/nbio/nbio_7_2_0_sh_mask.h, I think it sets aliases using #define for some addresses and values in hex to easily human-readable ans easy to understand names like BIFPLR1_PCIE_ADV_ERR_CAP_CNTL__COMPLETION_TIMEOUT_LOG_CAPABLE_MASK which is an alias for 0x00001000L. This file contains 134349 defines.