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Hello,

On Jan 31, 2007, at 00:37, Donald Lee wrote:

> One, at the end of the file, where the "${si}" gets put back in the
> pool, the operation is protected by "splvm()/splx()" rather than
> the msr ops that are now sprinkled in the code.  I thought the
> reason for the msrs was because the IPLs were unreliable.  Why
> are they OK here?

I had a further look at macppc's interrupt handling ( pretty much the 
last non-OpenPIC part I didn't mess with yet ) - first, splhigh doesn't 
block all interrupts, it explicitly allows IPL_SERIAL and I'm not quite 
sure what else, the hierarchy enforcement looks weird to say the least.

I think in a couple days I'll have something ready that makes 
interrupts on macppc behave as described in spl(9). If there's any 
additional documentation on this please let me know. I had a look at 
other archs' interrupt hierarchies ( sparc(64), shark, prep and a few 
others ) and they all differ from spl(9) in more or less creative ways, 
many appear to be derived from macppc. So which one is considered 
canonical if any?

have fun
Michael
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