struct page *drv_vma_nopage( struct vm_area_struct *vma,
    unsigned long address, int *type )
{
   unsigned long phys_address, pfn;
   struct page *page_wanted;

   phys_address = hw_mem_area + (address-vma->vm_start);
      if( (vma->vm_end-vma->vm_start)>HW_MEM_AREA_SIZE )
         return NOPAGE_SIGBUS;
   pfn = phys_address >> PAGE_SHIFT;
   if( !pfn_valid( pfn ) )
       return NOPAGE_SIGBUS;
   page_wanted = pfn_to_page( pfn );
   get_page( page_wanted );
   if( type )
       *type = VM_FAULT_MINOR;
   return page_wanted;
}