Date: Thu, 17 Jan 2008 01:17:57 +0100 From: Olivier Houchard <mlfbsd@ci0.org> To: Mark Tinguely <tinguely@casselton.net> Cc: freebsd-arm@freebsd.org Subject: Re: ARM pmap cache flushed after PT modification. Message-ID: <20080117001757.GA63358@ci0.org> In-Reply-To: <200801100031.m0A0VLgC015988@casselton.net> References: <200801081948.m08Jmpoa006156@casselton.net> <200801100031.m0A0VLgC015988@casselton.net>
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On Wed, Jan 09, 2008 at 06:31:21PM -0600, Mark Tinguely wrote: > > Using the same logic that the ARM ARM for pre-ARMv6 MMUs says the > cache has to be written back and/or invalidated before making > changes to page table entries; pmap_remove_all() also forces the > page table entry to NULL and I believe needs to be invalidated. > Hi Mark, I'm not sure this is needed, because we mark the page tables as write-through. Also, I must miss something, because I understand why we should wb after doing the changes, but why before ? (And no, I didn't forget you, and I'll have a look at your work soon, honest). Regards, Olivier
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