Date: Thu, 08 Jul 2010 02:12:50 -0600 (MDT) From: "M. Warner Losh" <imp@bsdimp.com> To: c.jayachandran@gmail.com Cc: jmallett@FreeBSD.org, freebsd-mips@FreeBSD.org Subject: Re: Merging 64 bit changes to -HEAD - part 4 Message-ID: <20100708.021250.1099368555950605809.imp@bsdimp.com> In-Reply-To: <AANLkTikSVi27V2UICgLvKd8Bk7v6tuGty9YX6-C6-21H@mail.gmail.com> References: <AANLkTikSVi27V2UICgLvKd8Bk7v6tuGty9YX6-C6-21H@mail.gmail.com>
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In message: <AANLkTikSVi27V2UICgLvKd8Bk7v6tuGty9YX6-C6-21H@mail.gmail.c=
om>
"Jayachandran C." <c.jayachandran@gmail.com> writes:
: On Tue, Jun 15, 2010 at 7:06 PM, Jayachandran C.
: <c.jayachandran@gmail.com> wrote:
: > I have volunteered to merge Juli's 64-bit work into HEAD, =A0and
: > hopefully get it to work on XLR too. The tree
: > (http://svn.freebsd.org/base/user/jmallett/octeon) has quite a bit =
of
: > changes, so I would like to do this over multiple changesets and
: > without breaking the current o32 code.
: =
: Here's the next installment, this has the next set of Juli's changes
: and some fixes to get it working on XLR. The patches in this set are:=
: =
: mips-segtab-macro.patch :
: Change PDE/PTE access to a macro (from Juli's branch)
This looks ok, I think.
: mips-cache-fix.patch :
: Minor fix for cache code (JC)
This looks good.
: rmi-other.patch:
: 64 bit compilation fixes for sys/mips/rmi (JC)
: Fixes to platform and driver code for 64 bit compilation, including
: changes to ethernet driver.
This is xlr specific, so I can't comment.
: mips-rmi-kx-enable.patch:
: Changes to enable KX bit for TARGET_XLR_XLS (JC).
: I have added another case for the TARGET_OCTEON #ifdef in exception.=
S
: and locore.S, but I think this can be moved to a header file later.
Yea, we need to do some rework here, but I think this is basically OK.
: pmap-n64.patch
: The main n64 patch (from Juli's branch)
: This still uses the old 2-level page tables. But this adds other
: pmap code to support n64. I have re-arranged some of Juli's code to
: reduce #ifdefs.
I think this could be done in smaller bites. At least the
MIPS_{PYHS,KSEGx}_TO_{KSEGx,PHYS} stuff can be done as a separate
patch.
I really like the use of direct maps where possible for 64-bit
machines. =
There's a number of comment fixes in this, which seem to be logically
independent as well. Not sure it is worth the effort of busting these
out though.
: runq-64.patch
: 64-bit rqb_word_t for n64 (JC)
I think this is cool.
: ldscript-64.patch
: 64 bit linker script (JC)
: linker script for 64 bit compilation, and XLR configuration file.
I wonder if the octeon ld script can be merged or if we can use this
for octeon. Some investigation is warranted, I think...
: With these changes, a n64 kernel can be compiled and it will to
: 'mountroot>' on XLR. There is more code left to merge in Juli's
: branch - 32 bit compat code, sfbuf/uio, UMA alloc, and DDB. which I
: should be able to get in the next one or two passes.
OK.
: Let me know your comments. There are only two minor changes should
: affect the existing o32 code paths in the above code (moving the chec=
k
: for >512M, and change in pmap_map to handle KSEG0 addresses), but let=
: me know if something breaks.
Will do. I'll see if I can create a system with these patches...
Warner
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