Re: TLB tiredown by ASID bump

[Eduardo Horvath <eeh%NetBSD.org@localhost>]

On Thu, 6 Jan 2011, Toru Nishimura wrote:

> I would propose here to add a new hook in exception return
> path for every NetBSD ports.  The hook point is at right
> after ast() call.  The hook is to call TLB ASID bump op
> (to write EntryHi with a single mtc0 instruction for MIPS
> architecture , for example).   It should be noted that the
> hook is also useful to do "isync operation" for the process
> which needs to invalidate instruction cache to continue.

I think exposing this implementation detail breaks the abstraction layer 
provided by pmap(9) and thus is a bad thing.  

Eduardo