Geoff Chappell, Software Analyst
This page lists all the exports that were added to the HAL for version 6.2, i.e., for Windows 8. All appear to be undocumented.
Version 6.2 discontinues two functions. One, HalCallBios dates from version 5.2 (and only then in 64-bit builds). Another, HalMcUpdateReadPCIConfig, was anyway introduced only as recently as version 6.1.