GH RES DATA
GH_RES_DATA is a system parameter that specifies the size in pages of the resident image data granularity hint region.
If bit 2 of the LOAD_SYS_IMAGES parameter is set, the image LDR$WRAPUP releases all unused pages in the granularity hint region at the the end of system startup. The unused pages of the resident image granularity hint region are either reserved for future use, or given back to the free memory list.
GH_RES_DATA has the AUTOGEN and FEEDBACK attributes.