On Sunday 20 May 2007 08:28, Stefan Richter wrote:
> Arnd Bergmann wrote:
> > On Sunday 20 May 2007, Stefan Richter wrote:
> >>> Note that this data structure only needs conversion on x86_64 and ia64,
but
> >>> not on powerpc and other 64 bit architectures that align __u64 also in
> >>> 32 bit mode.
> >> Is this conversion just unnecessary or actually harmful on ppc64 and
others?
> >
> > With the current patch, the compat_ioctl function does not handle the
ppc32
> > version of the structure at all, so it's broken there, it would at least
> > need a
> >
> > case RAW1394_IOC_GET_CYCLE_TIMER:
> > err = raw1394_ioctl(NULL, file, cmd, arg);
> > break;
>
> Dan,
>
> maybe we should change
>
> /* argument to RAW1394_IOC_GET_CYCLE_TIMER ioctl */
> struct raw1394_cycle_timer {
> /* contents of Isochronous Cycle Timer register,
> as in OHCI 1.1 clause 5.13 (also with non-OHCI hosts) */
> __u32 cycle_timer;
>
> /* local time in microseconds since Epoch,
> simultaneously read with cycle timer */
> __u64 local_time;
> };
>
> to
>
> /* argument to RAW1394_IOC_GET_CYCLE_TIMER ioctl */
> struct raw1394_cycle_timer {
> /*
> * least significant 32 bits are contents of Isochronous Cycle
> * Timer register, as in OHCI 1.1 clause 5.13 (also with
> * non-OHCI hosts)
> */
> __u64 cycle_timer;
>
> /*
> * local time in microseconds since Epoch,
> * simultaneously read with cycle timer
> */
> __u64 local_time;
> };
>
> before a libraw1394 with get-cycle-timer support is released.
> Shall I prepare according patches for raw1394 and libraw1394?
This seems like a good idea, and I have forwarded it to the ffado (formerly
freebob) developers, specifically Pieter Palmers--the submitter of
raw1394_read_cycle_timer--to get his feedback.
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