Hi,
Richard Braun, le Sun 31 Dec 2006 19:17:03 +0100, a écrit :
> A mach_port_t is actually a port name, a natural_t integer identifier for
> a port in a port space. Maybe the kernel uses this property and considers
> it can store the address of a port in a port name, to avoid a lookup ?
Thomas Bushnell BSG, le Sun 31 Dec 2006 13:06:55 -0800, a écrit :
> On Sun, 2006-12-31 at 12:30 +0100, Samuel Thibault wrote:
> > Hi,
> >
> > There's something I don't understand in
> > i386/i386at/i386at_ds_routines.c:ds_notify()
> >
> > dev = (device_t) ns->not_header.msgh_remote_port;
> >
> > How a port can be a device_t?
>
> A device_t is just a mach_port_t that is expected to be talking to
> something that implements the Mach device protocol.
Ok, and how these two views may coexist? As I showed, they _are_ mixed
in the case of the linux block device glue for instance:
linux/dev/glue/block.c:device_open():
bd->device.emul_data = bd;
bd->device.emul_ops = &linux_block_emulation_ops;
...
bd->port = ipc_port_alloc_kernel ();
...
notify = ipc_port_make_sonce (bd->port);
ip_lock (bd->port);
ipc_port_nsrequest (bd->port, 1, notify, ¬ify);
So here it's really a plain IPC port that is used (and it's the same in
the plain device/ds_routines.c, linux net glue and pcmcia glue), while
on the other end: i386/i386at/i386at_ds_routines.c
dev = (device_t) ns->not_header.msgh_remote_port;
How can this work? (I currently have a kernel fault here)
Samuel
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