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From: Scott Wood <scottwood@freescale.com>
Date: Tue, 7 Apr 2015 14:22:01 -0500
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Subject: Re: [Qemu-devel] [Bug 1438144] [NEW] Page sizes are not interpreted
 correctly for E500/E500MC
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To: Bug 1438144 <1438144@bugs.launchpad.net>
Cc: qemu-devel@nongnu.org

On Mon, 2015-03-30 at 11:21 +0000, WGH wrote:
> Public bug reported:
> 
> http://cache.freescale.com/files/32bit/doc/ref_manual/E500CORERM.pdf - see 2.12.5.2 MAS Register 1 (MAS1), p. 2-41
> http://cache.freescale.com/files/32bit/doc/ref_manual/E500MCRM.pdf - see 2.16.6.2 MAS Register 1 (MAS1), p. 2-54
> 
> According to these documents, variable page size for TLB1 is computed as
> 4K ** TSIZE.
> 
> However, QEMU always treats it as if it was 1K << TSIZE, even if options
> like "-cpu e500mc" are supplied to qemu.

MMU v2 (implemented in e6500) extended the TSIZE field so that 1K <<
TSIZE is correct.  The extension was on the LSB side so that it works
fine as long as the low bit of the new TSIZE (which is reserved on
e500v2/mc) is zero.

-Scott