ROW_SIZE_MASK
gb_addr_config &= ~ROW_SIZE_MASK;
((gb_addr_config & ROW_SIZE_MASK) >> ROW_SIZE_SHIFT) << 12;
tmp = (gb_addr_config & ROW_SIZE_MASK) >> ROW_SIZE_SHIFT;
((gb_addr_config & ROW_SIZE_MASK) >> ROW_SIZE_SHIFT) << 12;
gb_addr_config &= ~ROW_SIZE_MASK;
((gb_addr_config & ROW_SIZE_MASK) >> ROW_SIZE_SHIFT) << 12;