As promised from the irc session... here's details on the little
32/64-bit issue I ran into.
Its not quite a direct 32/64 bit thing in the drm itself exactly, but
ambiguity can be a problem...
drm_map_t.offset is unsigned long.
unsigned long is semi-unspecified, but is reasonably assumed to
On Tue, 2003-03-04 at 08:22, Philip Brown wrote:
unsigned long is semi-unspecified, but is reasonably assumed to be
a 32-bit quantity.
On all 64bit bit platforms I have met unsigned long is a 64bit quantity.
In fact I can't think of a single exception
mmap() takes an arg of type off_t.
off_t
On Tue, Mar 04, 2003 at 09:41:54AM -0800, Philip Brown wrote:
On Tue, Mar 04, 2003 at 01:27:28PM +, Alan Cox wrote:
On Tue, 2003-03-04 at 08:22, Philip Brown wrote:
unsigned long is semi-unspecified, but is reasonably assumed to be
a 32-bit quantity.
On all 64bit bit platforms I
On Tue, Mar 04, 2003 at 11:59:50AM -0600, Andy Isaacson wrote:
On Tue, Mar 04, 2003 at 09:41:54AM -0800, Philip Brown wrote:
On Tue, Mar 04, 2003 at 01:27:28PM +, Alan Cox wrote:
On all 64bit bit platforms I have met unsigned long is a 64bit quantity.
In fact I can't think of a single
Philip Brown wrote:
On Tue, Mar 04, 2003 at 11:59:50AM -0600, Andy Isaacson wrote:
The 64-bit kernel is perfectly capable of running 32-bit binaries, and
that's precisely what you're doing.
Yes. And that's exactly what DRI users will do. So right there is a
64/32 bit problem.
[snip]
So kernel
On Tue, 4 Mar 2003, Philip Brown wrote:
Does this thunking happen at the native OS level, or in the linux drm
code itself?
Each user has to thunk on its own, since nobody else even knows what the
ioctl stuctures are.
Moral of the story: avoid ioctl's. _Especially_ avoid ioctl's with
On Tue, 2003-03-04 at 18:12, Philip Brown wrote:
All numeric fields passed through the ioctls, should have fixed,
identifiable sizes.
I guess you do need a typedef then so you can support solaris without
trashing the other 99.999% of the userbase. In the Linux world the
ioctl32 handlers munge
On Tue, Mar 04, 2003 at 11:02:10PM +, Alan Cox wrote:
On Tue, 2003-03-04 at 18:12, Philip Brown wrote:
All numeric fields passed through the ioctls, should have fixed,
identifiable sizes.
I guess you do need a typedef then so you can support solaris without
trashing the other 99.999%
On Tue, 2003-03-04 at 22:15, Philip Brown wrote:
I believe DaveM's DRM for the sparc64 linux is quite happy with
mixed 32/64 user space.
Probably it has the same size for unsigned long in both 32 and 64 bit
modes.
I don't think so. I think the DRM ioctls get munged properly
It works is
