WINDOW_START
iomapadr = ioremap(WINDOW_START, WINDOW_LENGTH);
WINDOW_START, WINDOW_START+WINDOW_LENGTH-1 );
if (offset < WINDOW_START) {
window_start = WINDOW_START;
if (window_start == WINDOW_START) {
if (offset < WINDOW_START) {
window_start = WINDOW_START;
if (window_start == WINDOW_START) {
window_start = 3 * WINDOW_START;
window_start = 2 * WINDOW_START;
window_start = WINDOW_START;