chris@mimsy.UUCP (Chris Torek) (02/02/88)
>In article <10346@mimsy.UUCP> chris@mimsy.UUCP (Chris Torek) writes: >>on the Vax and the Tahoe, using the Software Interrupt Request >>Register, SIRR. In article <454@cosmo.UUCP> jum@cosmo.UUCP (Uwe Mager) writes: >gee, how do they do that on a 680xx ? setting flags ? On the Sun-3, at least, there is a hardware register that has a bit that can be set to cause an interrupt at IPL 1; see /sys/sun3/locore.s. Another alternative (one which I in fact implemented on one 68010 system) is to muck with the kernel stacks and arrange for an rte to `return' to a lower ipl and a service routine. (This is horribly gross, but if you have no hardware....) -- In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 7163) Domain: chris@mimsy.umd.edu Path: uunet!mimsy!chris