220 

   220 

   221 /** Memory-map callback for the EtherCAT character device.

   221 /** Memory-map callback for the EtherCAT character device.

   222  *

   222  *

   223  * The actual mapping will be done in the eccdev_vma_nopage() callback of the

   223  * The actual mapping will be done in the eccdev_vma_nopage() callback of the

   224  * virtual memory area.

   224  * virtual memory area.

   225  */

   227  */

   226 int eccdev_mmap(

   228 int eccdev_mmap(

   227         struct file *filp,

   229         struct file *filp,

   228         struct vm_area_struct *vma

   230         struct vm_area_struct *vma

   229         )

   231         )

   245 

   247 

   246 /** Page fault callback for a virtual memory area.

   248 /** Page fault callback for a virtual memory area.

   247  *

   249  *

   248  * Called at the first access on a virtual-memory area retrieved with

   250  * Called at the first access on a virtual-memory area retrieved with

   249  * ecdev_mmap().

   251  * ecdev_mmap().

   250  */

   254  */

   251 static int eccdev_vma_fault(

   255 static int eccdev_vma_fault(

   252         struct vm_area_struct *vma, /**< Virtual memory area. */

   256         struct vm_area_struct *vma, /**< Virtual memory area. */

   253         struct vm_fault *vmf /**< Fault data. */

   257         struct vm_fault *vmf /**< Fault data. */

   254         )

   258         )

   255 {

   259 {

   256     unsigned long offset = vmf->pgoff << PAGE_SHIFT;

   260     unsigned long offset = vmf->pgoff << PAGE_SHIFT;

   257     ec_cdev_priv_t *priv = (ec_cdev_priv_t *) vma->vm_private_data;

   261     ec_cdev_priv_t *priv = (ec_cdev_priv_t *) vma->vm_private_data;

   258     struct page *page;

   262     struct page *page;

   259 

   263 

   261         return VM_FAULT_SIGBUS;

   265         return VM_FAULT_SIGBUS;

   262 

   267 

   263     page = vmalloc_to_page(priv->ctx.process_data + offset);

   268     page = vmalloc_to_page(priv->ctx.process_data + offset);

   265         return VM_FAULT_SIGBUS;

   270         return VM_FAULT_SIGBUS;

   266 

   272 

   267     get_page(page);

   273     get_page(page);

   268     vmf->page = page;

   274     vmf->page = page;

   269 

   275 

   270     EC_MASTER_DBG(priv->cdev->master, 1, "Vma fault, virtual_address = %p,"

   276     EC_MASTER_DBG(priv->cdev->master, 1, "Vma fault, virtual_address = %p,"