void __init snake_inventory ( void);
Before PDC_SYSTEM_MAP was invented, the PDC_MEM_MAP call was used. To use it, we initialise the mod_path.bc to 0xff and try all values of mod to get the HPA for the top-level devices. Bus adapters may have sub-devices which are discovered by setting bc[5] to 0 and bc[4] to the module, then trying all possible functions.