sysctl question
Dear all, I have an issue here, I do read a temperature sensor and I got a value back, in integer. This value is 'encoded', it contains the integer and the fractional part of the temperature I read. This is inside a kernel module. I offer a sysctl interface to read this value. Currently the access is done with sysctl_handle_int. In my userland application I can print this value with the following macro: FIX32TOPRINT(f) ((f) >> 16),f) & 0x) * 1000) >> 16) But now I wonder how can I teach the sysctl to print my tempreature the same way as my userland app does. Right now it looks this way: dev.sm.1.sensor.cpu_b_ad7417_amb.temp: 2736128 If I feed this 2736128 into the macro above I get this: 41.750 this is what I expect. Is this even possible? TIA for any pointer. Andreas ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
Re: sysctl question
On 13.07.10 10:48, Ed Schouten wrote: * Andreas Tobler wrote: But now I wonder how can I teach the sysctl to print my tempreature the same way as my userland app does. I seem to remember all the other temperature sensors expose their value using tenth Kelvin precision. There is some kind of modifier you can add to the SYSCTL_INT declaration to denote that it's a temperature value. The sysctl(8) code on HEAD seems to suggest the type is "IK". Thanks Ed! I need to figure out how to format my temperature value to fit with this modifier. Regards, Andreas ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
ad7418 developer/users?
Hi all, I wrote a driver for my PowerMac7,2 which reads temperature and adc values from an ad7417, an ad7418 with four adc's. This driver would be ready for submission, but now I think about if it would make sense to bring these two drivers into the same source. For this idea I'd need some testers who have an ad7418. I saw the driver is used on some ARM configs. Anyone who has opinions, hw to test? Any help is appreciated. Thanks, Andreas ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
kernel dumps on powerpc/pmap questions
Hello all, to investigate a system lockup I need to implement kerneldumps on powerpc. Well, exactly on PowerMacs. The booke should already support this feature. Right now I'm at the point where I can dump something, means the mechanism to be able to get a (core) dump for example via 'call doadump' in db works. I can restore the dump via savecore. I took the approach from booke and implemented the necessary functions for PowerMacs. But here I'm offline. I do not understand what I want to dump, means which part of the memory. Once I know what to dump, where do I find the information, which addresses? How can I get a picture of the memory organization form powermacs? Is there a pointer available about pmap in the kernel to find out a bit more on this topic? What is really needed to be able to run kgdb on a core file to be able to find where the kernel crashed? I know the questions are a bit vague, but I need an entry point. I appreciate any pointer to implement this feature. Tia, Andreas ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
