static int
netmap_mmap_single(struct dev_mmap_single_args *ap)
{
int error;
struct cdev *cdev = ap->a_head.a_dev;
vm_ooffset_t *foff = ap->a_offset;
vm_object_t *objp = ap->a_object;
vm_size_t objsize = ap->a_size;
struct netmap_vm_handle_t *vmh;
struct netmap_priv_d *priv;
int prot = ap->a_nprot;
vm_object_t obj;
D("cdev %p foff %jd size %jd objp %p prot %d", cdev,
(intmax_t )*foff, (intmax_t )objsize, objp, prot);
vmh = kmalloc(sizeof(struct netmap_vm_handle_t), M_DEVBUF,
M_NOWAIT | M_ZERO);
if (vmh == NULL)
return ENOMEM;
vmh->dev = cdev;
NMG_LOCK();
error = devfs_get_cdevpriv(ap->a_fp, (void**)&priv);
if (error)
goto err_unlock;
vmh->priv = priv;
priv->np_refcount++;
NMG_UNLOCK();
error = netmap_get_memory(priv);
if (error)
goto err_deref;
obj = cdev_pager_allocate(vmh, OBJT_DEVICE,
&netmap_cdev_pager_ops, objsize, prot,
*foff, NULL);
if (obj == NULL) {
D("cdev_pager_allocate failed");
error = EINVAL;
goto err_deref;
}
*objp = obj;
return 0;
err_deref:
NMG_LOCK();
priv->np_refcount--;
err_unlock:
NMG_UNLOCK();
// err:
kfree(vmh, M_DEVBUF);
return error;
}
/*
* XXX this is the open call for the device
*/
NTSTATUS
ioctlCreate(PDEVICE_OBJECT DeviceObject, PIRP Irp)
{
NTSTATUS status = STATUS_SUCCESS;
// As stated in https://support.microsoft.com/en-us/kb/120170
// irpSp->FileObject is the same for every call from a certain
// handle so we can use it
// We can use the structure itself to keep the data
// [EXTRACT] { Because I/O requests with the same handle have the same file object,
// a driver can use the file-object pointer to identify the I/O operations that belong
// to one open instantiation of a device or file. }
struct netmap_priv_d *priv;
PIO_STACK_LOCATION irpSp;
irpSp = IoGetCurrentIrpStackLocation(Irp);
NMG_LOCK();
priv = irpSp->FileObject->FsContext;
if (priv == NULL) {
priv = malloc(sizeof (*priv), M_DEVBUF, M_NOWAIT | M_ZERO); // could wait
if (priv == NULL) {
status = STATUS_INSUFFICIENT_RESOURCES;
} else {
priv->np_refs = 1;
D("Netmap.sys: ioctlCreate::priv->np_refcount = %i", priv->np_refs);
irpSp->FileObject->FsContext = priv;
}
} else {
priv->np_refs += 1;
D("Netmap.sys: ioctlCreate::priv->np_refcount = %i", priv->np_refs);
}
NMG_UNLOCK();
//--------------------------------------------------------
//D("Netmap.sys: Pid %i attached: memory allocated @%p", currentProcId, priv);
Irp->IoStatus.Status = status;
IoCompleteRequest( Irp, IO_NO_INCREMENT );
return Irp->IoStatus.Status;
}