Map legacy pci io into user memory space
int pci_mmap_legacy_io(struct file * filp, struct kobject * kobj, struct bin_attribute * attr, struct vm_area_struct * vma);
filp
open sysfs file
kobj
kobject corresponding to device to be mapped
attr
struct bin_attribute for this file
vma
struct vm_area_struct passed to mmap
Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap legacy IO space (first meg of bus space) into application virtual memory space. Returns -ENOSYS if the operation isn't supported