Date: Fri, 16 Sep 2016 22:24:54 +0000 From: "sson (Stacey Son)" <phabric-noreply@FreeBSD.org> To: freebsd-mips@freebsd.org Subject: [Differential] D2535: New, experimental PMAP implementation for MIPS64 Message-ID: <1a765d6044a36757ca5c25147952551f@localhost.localdomain> In-Reply-To: <differential-rev-PHID-DREV-5xurf3bsmfb7qsmjczka-req@FreeBSD.org> References: <differential-rev-PHID-DREV-5xurf3bsmfb7qsmjczka-req@FreeBSD.org>
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sson added a comment. In https://reviews.freebsd.org/D2535#163954, @adrian wrote: > I committed the pagemask enumeration/printing logic to -head a while ago. We should gather some dmesg's from various embedded MIPS boards. > > IIRC, some of the mips24kc parts were only doing 4k pages.. :( This superpage/new pmap implementation really only applies to mips64. To support superpages on mips32 the page table may need to be changed a bit. Currently there isn't enough room in the PTE for the additional bits needed. e.g, bit for reference bit emulation (reference/valid bit), superpage flag, etc. FYI, I do have a patch kicking around for large kernel stack support that uses multiple wired TLB entries that might be useful for mips32 with only 4k page support. Of course, I don't know if blowing the kernel stack (e.g. using NFS) is a problem for mips32 or not. Brooks had it committed to CheriBSD at one time so I know it is in that repository. REPOSITORY rS FreeBSD src repository REVISION DETAIL https://reviews.freebsd.org/D2535 EMAIL PREFERENCES https://reviews.freebsd.org/settings/panel/emailpreferences/ To: sbruno, sson Cc: adrian, brooks, jmallett, markj, alc, sbruno, rwatson, emaste, imp, freebsd-mips-list, dnelson_1901_yahoo.com, mizhka_gmail.com
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