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From: Jesse Millwood <jmillwood@masten.aero>
To: "Cédric Le Goater" <clg@kaod.org>
Cc: David Gibson <dgibson@redhat.com>,
	Daniel Henrique Barboza <danielhb413@gmail.com>,
	"qemu-ppc@nongnu.org" <qemu-ppc@nongnu.org>,
	QEMU Developers <qemu-devel@nongnu.org>
Subject: Re: [EXT] - Re: Help with ppc e500 tlb usage
Date: Fri, 21 Jan 2022 18:38:38 +0000	[thread overview]
Message-ID: <SA1P110MB12933786AEDA2EDF031C2D39B05B9@SA1P110MB1293.NAMP110.PROD.OUTLOOK.COM> (raw)
In-Reply-To: <f7fc4a74-2f20-451e-6a4f-d89c395c24ff@kaod.org>

On Fri, 2022-01-21 at 18:57 +0100, Cédric Le Goater wrote:
> CAUTION: This email originated from outside of the organization.
> Please do not click links or open attachments unless you recognize
> the sender's email address and know the content is safe.
> 
> 
> > Thanks for the background info Cédric, I wasn't aware of the MMUv2.
> > I see now that in target/ppc/cpu_init.c the e500v2 and e5500 have
> > the same mmu_model, the POWREPC_MMU_BOOKE206.
> > I'd like to be able to set the initial tlb entry size from the
> > platform definition by indicating the size in kib. I'll just use
> > the 2^TSIZE then.
> 
> Well, the approach of adding a class attribute and for a new machine
> is the right one.

Are you saying this so that I can conditionally compute the accurate TSIZE value that matches the real world machine? 

I'm still trying to get my head wrapped around the QOM. Would you advise adding a class attribute to the CPUPPCState or the PPCE500MachineClass? The CPUPPCState has the mmu_model field. However, that is the POWERPC_MMU_BOOKE206. Is there somewhere else you had in mind adding an attribute? 

> > > The e500 only supports the following page sizes:
> > > 
> > >              0b0001 4KB
> > >              0b0010 16KB
> > >              0b0011 64KB
> > >              0b0100 256KB
> > >              0b1011 4GB
> > >              0b0101 1MB
> > >              0b0110 4MB
> > >              0b0111 16MB
> > >              0b1000 64MB
> > >              0b1001 256MB
> > >              0b1010 1GB
> > > 
> > 
> > Is that how much the emulated e500 supports? The E500 Core
> > Reference manual states that it supports up to 4GiB.
> 
> Yes the list is out of order ! :)

Oh shoot, yeah I missed that.

> 
> Thanks,
> 
> C.


      reply	other threads:[~2022-01-21 19:41 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <PH1P110MB12849EB7B10C757A6B9FEA4FB0589@PH1P110MB1284.NAMP110.PROD.OUTLOOK.COM>
2022-01-21 12:17 ` Help with ppc e500 tlb usage Cédric Le Goater
2022-01-21 17:47   ` Jesse Millwood
2022-01-21 17:57     ` Cédric Le Goater
2022-01-21 18:38       ` Jesse Millwood [this message]

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