[wdmaudiodev] Re: Floating Point in the Kernel
- From: Devendra Parakh <parakh@xxxxxxxxxxxxxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Thu, 24 Oct 2002 10:20:46 -0700
I have found a solution - I'm not sure if this is the right one!
Link the driver with libcntpr.lib.
I say I'm not sure because there's no documentation from Microsoft about
thislibrary, but a few posts on different newsgroups seem to indicate that
it's okay to use this library in a kernel mode driver, and of course a
numberof sample drivers in the DDK seem to use it!
Can anybody throw some more light on this?
Thanks.
Devendra.
At 12:57 PM 10/23/2002, Devendra Parakh wrote:
Another related question:
When using floating point in the driver, the compiler generates calls to the
floating point library!
There're references to fltused (I think I can get rid of that by defining my
own fltused!), and __ftol.
Why does the compiler need to call ftol - can it not use the FPU to do this?
The line that seems to cause this call is:
*((int *)&data) = (int)fData;
where fData is a float.
Please note that the following line does not require ftol, why?
*((int *)&data) = (int)(float)1.0;
Is there a compiler define? Or will I have to roll my own ftol!
Any help would be greatly appreciated!
Thanks.
Devendra.
At 05:48 PM 10/22/2002, Noel Cross wrote:
Check out the DDK article:=20
http://msdn.microsoft.com/library/default.asp?url=3D/library/en[1]
-us/kmarch[1]=
/
hh/kmarch/k105_91de.asp
Regards,
Noel Cross
Development Lead, Audio/Video Devices Group
This posting is provided "AS IS" with no warranties, and confers no
rights.
-----Original Message-----
From: Devendra Parakh [mailto:parakh@xxxxxxxxxxxxxxxxxxxx]=20[2[2]]
Sent: Tuesday, October 22, 2002 2:16 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Floating Point in the Kernel
Hi,
What are the restrictions for using floating point in the kernel?
All I need to do is convert between 32bit ints and 32bit floats.
I think I can use FLOATOBJ, but I was hoping for a better alternative.
The driver will only run under Windows XP, so ME/9x is not really a
concern
for me.
Thanks.
Devendra.
Devendra Parakh Singing Electrons, Inc.
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