[Qemu-devel] [Bug 1438144] [NEW] Page sizes are not interpreted correctly for E500/E500MC

[Qemu-devel] [Bug 1438144] [NEW] Page sizes are not interpreted correctly for E500/E500MC

[WGH]

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.

** Affects: qemu
     Importance: Undecided
         Status: New

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Title:
  Page sizes are not interpreted correctly for E500/E500MC

Status in QEMU:
  New

Bug description:
  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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1438144/+subscriptions

Re: [Qemu-devel] [Bug 1438144] [NEW] Page sizes are not interpreted correctly for E500/E500MC

[Scott Wood]

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

[Qemu-devel] [Bug 1438144] Re: Page sizes are not interpreted correctly for E500/E500MC

[Scott Wood]

This is not a bug.  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.


** Changed in: qemu
       Status: New => Invalid

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Title:
  Page sizes are not interpreted correctly for E500/E500MC

Status in QEMU:
  Invalid

Bug description:
  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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1438144/+subscriptions

[Qemu-devel] [Bug 1438144] Re: Page sizes are not interpreted correctly for E500/E500MC

[WGH]

You're absolutely right. Sorry for bothering.

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https://bugs.launchpad.net/bugs/1438144

Title:
  Page sizes are not interpreted correctly for E500/E500MC

Status in QEMU:
  Invalid

Bug description:
  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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1438144/+subscriptions