Date: Tue, 7 Aug 2007 09:43:21 -0700 From: Marcel Moolenaar <xcllnt@mac.com> To: freebsd-ppc@freebsd.org Subject: Revamp of interrupt code (INTR_FILTER support) Message-ID: <ABAF6050-BF7A-4806-9BAD-A6628D164604@mac.com>
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All, With INTR_FILTER likely going to me the default for FreeBSD 7.0, some work was necessary for PowerPC to support that. A rather large diff can be found here: http://www.xcllnt.net/~marcel/ppc.diff It contains changes necessary to support INTR_FILTER as well as some related and/or nearby improvements, such as: 1. Enable interrupts for traps() when interrupts were enabled at the time of the trap. This improves the interactive behaviour of the machine. It avoids that syscalls run with interrupts disabled for example. 2. Revamp the PIC interface to have it not deal with resources, but rather with access to the hardware. The resource handling is moved to nexus. This was necessary, because INTR_FILTER requires EOI and MASK+EOI calback functions. 3. With 2 in place, there's no need for early attach of PIC drivers anymore. The platform code delays programming the hardware until all hardware has been enumerated. This makes the openpic(4) and hrowpic(4) drivers much simpler. See powerpc_enable_intr() in configure_final(). 4. Interrupt handlers are passed the trapframe when they don't have an argument specified already. This allows the use of external interrupts for hardclock, statclock and/or profclock. The OpenPIC has 4 global timers, which seem very suitable. There are still some lose ends, such as interrupt counters and psim support, but I'd like to get the patch out for testing and review. I would especially appreciate it if someone with an older G3 that has the Heathrow PIC can test that I didn't break anything there. I can only test the OpenPIC driver myself. Thanks, -- Marcel Moolenaar xcllnt@mac.comhome | help
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