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From owner-freebsd-ppc  Mon May 21  6:48:19 2001
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Date: Mon, 21 May 2001 23:48:12 +1000
From: Benno Rice <benno@FreeBSD.org>
To: freebsd-ppc@freebsd.org
Cc: freebsd-hackers@freebsd.org
Subject: FreeBSD/powerpc work to date
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Hi,
=20
I've placed a snapshot of my work on FreeBSD/powerpc to date up at:
        http://people.freebsd.org/~benno/commit/

I'd like to commit this sometime in the next few days.  This current snapsh=
ot
will get up to attempting to initialise VM and hang on my iMac (slot-loading
model).  There are some unresolved issues with pmap.c that are preventing it
getting further at the moment.

I'd like to commit this so as to allow more people to look at it, and also
to get it under some form of change control.

There are undoubtedly style bugs and numerous other problems with the code
as it stands, however I'd like to get it in the tree now and sort these
out later.

Please feel free to review, comment, etc.

The snapshot is in the form of a diff against -CURRENT and a tar.gz file
containing new files that would need to be committed.  Both of these
files are rooted in src/sys.

Replies set to go to freebsd-ppc.

--=20
Benno Rice
benno@FreeBSD.org

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From owner-freebsd-ppc  Mon May 21 14:47:30 2001
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Subject: Re: FreeBSD/powerpc work to date 
In-reply-to: Your message of "Mon, 21 May 2001 23:48:12 +1000."
		<20010521234812.B56326@rafe.jeamland.net> 
References: <20010521234812.B56326@rafe.jeamland.net>  
Date: Mon, 21 May 2001 15:47:28 -0600
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In message <20010521234812.B56326@rafe.jeamland.net> Benno Rice writes:
: I've placed a snapshot of my work on FreeBSD/powerpc to date up at:
:         http://people.freebsd.org/~benno/commit/

As near as I can tell, the diffs are good.

Warner

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From owner-freebsd-ppc  Mon May 21 17:23:14 2001
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Date: Mon, 21 May 2001 19:23:32 +0000
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I am just wondering if a FreeBSD for the PowerPC Motorola chip,
especially the G4 chip will be out anytime soon?



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From owner-freebsd-ppc  Tue May 22  2:45:36 2001
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Hey there, I found a great retail site with all kinds of products. Home 
decor, office decor, travel, outdoors, kitchen, etc... Take a look around 
at http://www.merchandisewholesale.com  just click on the images of the 
product to enlarge it for a better view.  

Sincerely,
          John

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From owner-freebsd-ppc  Tue May 22  8:16:39 2001
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Date: Tue, 22 May 2001 16:15:12 +0100 (BST)
From: Doug Rabson <dfr@nlsystems.com>
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Cc: <freebsd-hackers@freebsd.org>
Subject: Re: FreeBSD/powerpc work to date
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On Mon, 21 May 2001, Benno Rice wrote:

> Please feel free to review, comment, etc.
>
> The snapshot is in the form of a diff against -CURRENT and a tar.gz file
> containing new files that would need to be committed.  Both of these
> files are rooted in src/sys.

Nice! Reading through the changes, I have a couple of comments. In
mp_machdep.c, you should remove the 'include <machine/rpb.h>' - that is
only ever likely to exist on alpha. You can alsp delete ipl.h since that
has been removed for the other arches.

In swtch.s, you are correct in thinking that Idle is unneeded. A generic
assembler question - why the use of _C_LABEL(xx)? Surely since we are only
ever going to be using ELF here, we can assume the format of C names? Its
difficult to see what is happening since I'm not familiar with powerpc
assembler but it appears that you are saving the process state on the
stack (using a 'struct switchframe'). The other architectures save this
information in the PCB - I'm not sure which is the best place.

I notice that pmap.c contains a mix of programming styles with some of the
code using ANSI and some K&R. The trend seems to be to move to ANSI for
all new code so its probably worth converting the rest of the file.

How far does the beast get when booting?

-- 
Doug Rabson				Mail:  dfr@nlsystems.com
					Phone: +44 20 8348 6160



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From owner-freebsd-ppc  Tue May 22 12:59:54 2001
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Francois Dorval B.Eng,P.Eng.
System Group Manager
Memotec Communications Inc.
600, rue McCaffrey
Montreal (Quebec)
Canada H4T 1N1
Tel: (514) 738-4781 #430
Fax: (514) 738-4436
Email: dorvalf@memotec.com

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(Quebec)<BR>Canada H4T 1N1<BR>Tel: (514) 738-4781 #430<BR>Fax: (514)=20
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From owner-freebsd-ppc  Tue May 22 17:16:48 2001
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From: Benno Rice <benno@FreeBSD.org>
To: Doug Rabson <dfr@nlsystems.com>
Cc: freebsd-ppc@freebsd.org
Subject: Re: FreeBSD/powerpc work to date
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On Tue, May 22, 2001 at 04:15:12PM +0100, Doug Rabson wrote:
> On Mon, 21 May 2001, Benno Rice wrote:
>=20
> > Please feel free to review, comment, etc.
> >
> > The snapshot is in the form of a diff against -CURRENT and a tar.gz file
> > containing new files that would need to be committed.  Both of these
> > files are rooted in src/sys.
>=20
> Nice! Reading through the changes, I have a couple of comments. In
> mp_machdep.c, you should remove the 'include <machine/rpb.h>' - that is
> only ever likely to exist on alpha. You can alsp delete ipl.h since that
> has been removed for the other arches.

Ah.  I started with the code from NetBSD and pulled bits from around the tr=
ee
to fill gaps, so there's some weirdness in there. =3D)
=20
> In swtch.s, you are correct in thinking that Idle is unneeded. A generic
> assembler question - why the use of _C_LABEL(xx)? Surely since we are only
> ever going to be using ELF here, we can assume the format of C names? Its
> difficult to see what is happening since I'm not familiar with powerpc
> assembler but it appears that you are saving the process state on the
> stack (using a 'struct switchframe'). The other architectures save this
> information in the PCB - I'm not sure which is the best place.

This is probably NetBSD code.  Since I haven't got that far yet, it's pretty
much unchanged except that I separated their locore.s into smaller files as
per the other FreeBSD ports.
=20
> I notice that pmap.c contains a mix of programming styles with some of the
> code using ANSI and some K&R. The trend seems to be to move to ANSI for
> all new code so its probably worth converting the rest of the file.

Yeah.  I'll be doing that.
=20
> How far does the beast get when booting?

There's still an issue somewhere in the pmap code in that as soon as I flush
the TLB it starts having problems.  If I leave the TLB alone though it mana=
ges
to crawl it's way to vm_mem_init and vm_page_startup before falling over.

--=20
Benno Rice
benno@FreeBSD.org

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From owner-freebsd-ppc  Tue May 22 19: 8:49 2001
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>>>>> Benno Rice writes:

Benno> There's still an issue somewhere in the pmap code in that as soon as I flush
Benno> the TLB it starts having problems.  If I leave the TLB alone though it mana=
Benno> ges
Benno> to crawl it's way to vm_mem_init and vm_page_startup before falling over.

	Is the kernel running real or virtual at that point?  It sounds
like you are running virtual and blowing away the TLB before the page
table structures are in place to allow the kernel to handle a page fault.
Are you mapping the kernel with a large BAT?

David

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From owner-freebsd-ppc  Tue May 22 19:57:35 2001
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Subject: Re: FreeBSD/powerpc work to date
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On Tue, May 22, 2001 at 10:08:44PM -0400, David Edelsohn wrote:
> >>>>> Benno Rice writes:
>=20
> Benno> There's still an issue somewhere in the pmap code in that as soon =
as
> Benno> I flush the TLB it starts having problems.  If I leave the TLB alo=
ne
> Benno> though it manages to crawl it's way to vm_mem_init and
> Benno> vm_page_startup before falling over.
>=20
> 	Is the kernel running real or virtual at that point?  It sounds
> like you are running virtual and blowing away the TLB before the page
> table structures are in place to allow the kernel to handle a page fault.
> Are you mapping the kernel with a large BAT?

It's running virtual.  I've got DBAT and IBAT mappings for the kernel, and
DBAT mappings for various bits of IO space.  I've duplicated the OpenFirmwa=
re
mappings into my new page table.  My current theories are either that there
are errors in my PTE insertion code or that something's really messed up wi=
th
my stack.

--=20
Benno Rice
benno@FreeBSD.org

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From owner-freebsd-ppc  Thu May 24 17:53:47 2001
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From: "David O'Brien" <obrien@FreeBSD.org>
To: Benno Rice <benno@FreeBSD.org>
Cc: Doug Rabson <dfr@nlsystems.com>, freebsd-ppc@FreeBSD.org
Subject: Re: FreeBSD/powerpc work to date
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On Wed, May 23, 2001 at 10:16:43AM +1000, Benno Rice wrote:
> > Nice! Reading through the changes, I have a couple of comments. In
> > mp_machdep.c, you should remove the 'include <machine/rpb.h>' - that is
> > only ever likely to exist on alpha. You can alsp delete ipl.h since that
> > has been removed for the other arches.
> 
> Ah.  I started with the code from NetBSD and pulled bits from around the tree
> to fill gaps, so there's some weirdness in there. =)

I would rather not see things with NetBSD weirdness we do not understand
committed.  Otherwise these bits will last forever and we'll have a
platform who's code smells different from the other smelling two we
already have.

I cannot tell from your reply if you are going to act on DFR's issue.
You only explained the why, not what you plan to do about it.

  
> > In swtch.s, you are correct in thinking that Idle is unneeded. A generic
> > assembler question - why the use of _C_LABEL(xx)? Surely since we are only
> > ever going to be using ELF here, we can assume the format of C names? Its
> > difficult to see what is happening since I'm not familiar with powerpc
> > assembler but it appears that you are saving the process state on the
> > stack (using a 'struct switchframe'). The other architectures save this
> > information in the PCB - I'm not sure which is the best place.
> 
> This is probably NetBSD code.  Since I haven't got that far yet, it's pretty
> much unchanged except that I separated their locore.s into smaller files as
> per the other FreeBSD ports.

See my concerns above.  I especially feel this way about strange
macros.  Those of us reading both Alpha and x86 headers often have to
scratch our heads what these NetBSD macros do, etc..


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From owner-freebsd-ppc  Fri May 25 23:22:14 2001
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On Thu, May 24, 2001 at 05:53:39PM -0700, David O'Brien wrote:
> On Wed, May 23, 2001 at 10:16:43AM +1000, Benno Rice wrote:
> > > Nice! Reading through the changes, I have a couple of comments. In
> > > mp_machdep.c, you should remove the 'include <machine/rpb.h>' - that =
is
> > > only ever likely to exist on alpha. You can alsp delete ipl.h since t=
hat
> > > has been removed for the other arches.
> >=20
> > Ah.  I started with the code from NetBSD and pulled bits from around the
> > tree to fill gaps, so there's some weirdness in there. =3D)
>=20
> I would rather not see things with NetBSD weirdness we do not understand
> committed.  Otherwise these bits will last forever and we'll have a
> platform who's code smells different from the other smelling two we
> already have.

There's already some NetBSDisms in alpha, since (IIRC) it took pretty much
the same path.  I left the NetBSD stuff there in case I need to refer to it
while writing/changing the code to support FreeBSD.

> I cannot tell from your reply if you are going to act on DFR's issue.
> You only explained the why, not what you plan to do about it.

I plan to leave it there until the code is obsolete basically.  Once I have
a piece of code that works, I'll delete the NetBSD code (unless of course
that code's used =3D)).

> > > In swtch.s, you are correct in thinking that Idle is unneeded. A gene=
ric
> > > assembler question - why the use of _C_LABEL(xx)? Surely since we are=
 only
> > > ever going to be using ELF here, we can assume the format of C names?=
 Its
> > > difficult to see what is happening since I'm not familiar with powerpc
> > > assembler but it appears that you are saving the process state on the
> > > stack (using a 'struct switchframe'). The other architectures save th=
is
> > > information in the PCB - I'm not sure which is the best place.
> >=20
> > This is probably NetBSD code.  Since I haven't got that far yet, it's p=
retty
> > much unchanged except that I separated their locore.s into smaller file=
s as
> > per the other FreeBSD ports.
>=20
> See my concerns above.  I especially feel this way about strange
> macros.  Those of us reading both Alpha and x86 headers often have to
> scratch our heads what these NetBSD macros do, etc..

I agree, I'm just trying to get it working as the time I can spend on this =
is
limited.  My plan is to get it to a point, probably single-user, then start
a big clean up to cut out unused and/or unneeded code and make sure the
code's all adhering to style(9) and has comments and suchlike.

--=20
Benno Rice
benno@FreeBSD.org

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