_start &= ~(PAGE_SIZE-1);
for( ; _len > PAGE_SIZE; _len -= PAGE_SIZE, _start += PAGE_SIZE ) {
if( MM_GetPhysAddr(_start) != 0 )
_start &= ~(PAGE_SIZE-1);
for( ; _len > PAGE_SIZE; _len -= PAGE_SIZE, _start += PAGE_SIZE ) {
if( MM_GetPhysAddr(_start) != 0 )