+ For PEI phase, the PEI service GetHobList() can be used to retrieve the pointer \r
+ to the HOB list. For the DXE phase, the HOB list pointer can be retrieved through\r
+ the EFI System Table by looking up theHOB list GUID in the System Configuration Table.\r
+ Since the System Configuration Table does not exist that the time the DXE Core is \r
+ launched, the DXE Core uses a global variable from the DXE Core Entry Point Library \r
+ to manage the pointer to the HOB list.\r
+ \r
+ If the pointer to the HOB list is NULL, then ASSERT().\r
+ \r