installing an ISR from user code
We have written a char driver for our proprietary h/w. This driver handles a
multitude of interrupts from the h/w in the following fashion: The ISR reads/saves the status register (indication of which int was hit) in global, and the marks the BH to run. The BH uses the global to call one of 32 "ISRs" (an array of func ptrs). I would like to be able to install an "ISR" dynamically from user code (the module has already been installed). Is this possible?
If it is possible, how does the build/link work?
thanks,
[email protected]
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I'm new at this myself, but how about creating a minor number for each ISR? When the BH runs, it wakes up the processing waiting on the device for that ISR. The user code opens as whatever devices it's interested in and waits for interrupts using select.
robert
Quoted 12 lines · * Brett Smith ([email protected]) [001030 09:25]:
We have written a char driver for our proprietary h/w. This driver handles a
multitude of interrupts from the h/w in the following fashion: The ISR reads/saves the status register (indication of which int was hit) in global, and the marks the BH to run. The BH uses the global to call one of 32 "ISRs" (an array of func ptrs). I would like to be able to install an "ISR" dynamically from user code (the module has already been installed). Is this possible?If it is possible, how does the build/link work?
Quoted 8 lines
thanks,
[email protected]-
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Quoted 3 lines · On Mon, Oct 30, 2000 at 11:06:59AM -0800, [email protected] wrote:
I'm new at this myself, but how about creating a minor number for each ISR? When the BH runs, it wakes up the processing waiting on the device for that ISR.
... which won't get run until after the interrupt is processed, but the interrupt won't get processed until it's run. Nope.
Tim.
*/
Quoted 8 lines · Brett Smith
We have written a char driver for our proprietary h/w. This driver
handles a multitude of interrupts from the h/w in the following fashion: The ISR reads/saves the status register (indication of which int was hit) in global, and the marks the BH to run. The BH uses the global to call one
of 32 "ISRs" (an array of func ptrs). I would like to be able to
install an "ISR" dynamically from user code (the module has already been
installed). Is this possible?If it is possible, how does the build/link work?
Of course it is possible. - There are drivers out there doing similar things. - Unfortunately while the one I actually know is open source the program attaching to this driver is not open source so you can only see the kernel side of the solution. )-:
Download: ftp://ftp.sigmadesigns.com/NetStr_2000/NetStream2000-0.1.033.0.tar.gz
Gunzip/Untar the archive and look in the Barbados/kernelmode directory in the file quasar.c. - In that file you will find the implementation of some IOCTLs and the one you will find most interesting is IOCTL_SEND_PID which is used for the purpose of registering a user space ISR with the kernel mode driver.
This concept can easily be extended by another passed in argument containing which ISR to register with this call or you could do them all at once whatever suits you.
Hope this helps.
Regards,
Anton
Quoted 8 lines
thanks,
[email protected]-
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Signature · 12 lines
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Quoted 6 lines · Tim Waugh
Quoted 3 lines · On Mon, Oct 30, 2000 at 11:06:59AM -0800, [email protected] wrote:
I'm new at this myself, but how about creating a minor number for each ISR? When the BH runs, it wakes up the processing waiting on the device for that ISR.
Quoted 6 lines
... which won't get run until after the interrupt is processed, but the interrupt won't get processed until it's run. Nope.
Tim.
*/
An interrupt will occur at any time. The user-pages may not be in memory at that time.
I suggest you do your ISR in the driver (or module) where it really should be done. The ISR pages are always present.
Cheers,
Dick Johnson
Penguin : Linux version 2.2.17 on an i686 machine (801.18 BogoMips).
"Memory is like gasoline. You use it up when you are running. Of course you get it all back when you reboot..."; Actual explanation obtained from the Micro$oft help desk.
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