On Fri, Jan 25, 2002 at 04:14:20PM -0700, Tom Bradley wrote: > I am playing with the GazOS. Learning to program the PIC and PIT. However I > am having a problem. The ISR function isn't being called when the PIT sends a > tick (this is his code I am trying to fix.) Linux books say the interrupt is > int '0x20'. I read some manuals about the PIT and they say it is 'int 0x8', > but don't use it because that ISR calls 'int 0x1C', but the GazOS originally > used 'int 0x64' to try and catch timer interrupts. The IDT is setup properly, > because other interrupts are working. I just can't get this one working. What > is the correct interrupt to responsed to? As I understand it the PIT generates interrupt 0 and that's fixed. The PIC is then programmed with an offset to add to interrupt numbers. For more details, see: ftp://download.intel.com/support/controllers/peripheral/231468.pdf and the somewhat more useful ftp://download.intel.com/design/chipsets/datashts/29068702.pdf Cheers, Bill -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ IRC Channel: irc.openprojects.net / #kernelnewbies Web Page: http://www.kernelnewbies.org/
