static int demo_mmap(struct file* filp, struct vm_area_struct *vma){
unsigned long physics = virt_to_phys((void*) (unsigned long)buffer);
unsigned long mypfn = physics >>PAGE_SHIFT;
unsigned long vmsize = vma->vm_end - vma->vm_start;
printk("mmap called.\n");
if(vmsize >BUFFER_SIZE)
return -EINVAL;
vma->vm_ops = &remap_vm_ops;
vma->vm_flags |= VM_RESERVED;
demo_vma_open(vma);
if(remap_pfn_range(vma, vma->vm_start, mypfn, vmsize, vma->vm_page_prot));
return -EAGAIN;
return 0;
}
static int demo_mmap(struct file *filp,struct vm_area_struct *vma)
{
unsigned long physics=virt_to_phys((void*)(unsigned long)buffer);
unsigned long mypfn=physics>>PAGE_SHIFT;
unsigned long vmsize=vma->vm_end-vma->vm_start;
printk(KERN_INFO "demo mmap called.\n");
if(vmsize > BUFFER_SIZE)
{
return -EINVAL;
}
vma->vm_ops=&remap_vm_ops;
vma->vm_flags|=(VM_IO | VM_LOCKED | (VM_DONTEXPAND | VM_DONTDUMP));
demo_vma_open(vma);
if(remap_pfn_range(vma,vma->vm_start,mypfn,vmsize,vma->vm_page_prot))
{
return -EAGAIN;
}
return 0;
}
