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[Qemu-devel] Re: sparc32 do_unassigned_access overhaul
From: |
Blue Swirl |
Subject: |
[Qemu-devel] Re: sparc32 do_unassigned_access overhaul |
Date: |
Fri, 15 Jan 2010 21:26:12 +0000 |
On Fri, Jan 15, 2010 at 9:11 PM, Artyom Tarasenko
<address@hidden> wrote:
> 2010/1/15 Blue Swirl <address@hidden>:
>> On Fri, Jan 15, 2010 at 6:46 PM, Artyom Tarasenko
>> <address@hidden> wrote:
>>> According to pages 9-31 - 9-34 of "SuperSPARC & MultiCache Controller
>>> User's Manual":
>>>
>>> 1. "A lower priority fault may not overwrite the
>>> MFSR status of a higher priority fault."
>>> 2. The MFAR is overwritten according to the policy defined for the MFSR
>>> 3. The overwrite bit is asserted if the fault status register (MFSR)
>>> has been written more than once by faults of the same class
>>> 4. SuperSPARC will never place instruction fault addresses in the MFAR.
>>>
>>> Implementation of points 1-3 allows booting Solaris 2.6 and 2.5.1.
>>
>> Nice work! This also passes my tests.
>
> I'm afraid we still are not there yet though: Solaris 7 fails potentially due
> to
> another bug in the MMU emulation, and the initial [missing-] RAM
> detection in OBP fails
> very probably due to a bug in in the MMU emulation.
Some guesses:
- Access to unassigned RAM area may be handled by the memory
controller differently (no faults, different faults etc.) than
unassigned access to SBus or other area.
- Real RAM banks have aliasing effects (which could be emulated by
mapping the aliased RAM areas many times).
- OBP on machines with ECC controller may detect missing RAM using ECC checks.
>> However, there are some CODING_STYLE issues.
>
> Is it something you do by hand (or, actually, by eyes), or is there a
> way I can automatically test my patches before sending?
There is CODING_STYLE document in the QEMU tree, please read it.
It's too bad we don't have a checkpatch script like Linux kernel has.
IIRC Anthony once said that he may write one.
- [Qemu-devel] sparc32 do_unassigned_access overhaul, Artyom Tarasenko, 2010/01/15
- [Qemu-devel] Re: sparc32 do_unassigned_access overhaul, Blue Swirl, 2010/01/15
- [Qemu-devel] Re: sparc32 do_unassigned_access overhaul, Artyom Tarasenko, 2010/01/15
- [Qemu-devel] Re: sparc32 do_unassigned_access overhaul,
Blue Swirl <=
- [Qemu-devel] Re: sparc32 do_unassigned_access overhaul, Artyom Tarasenko, 2010/01/15
- [Qemu-devel] Re: sparc32 do_unassigned_access overhaul, Artyom Tarasenko, 2010/01/19
- [Qemu-devel] Re: sparc32 do_unassigned_access overhaul, Blue Swirl, 2010/01/19
- [Qemu-devel] Re: sparc32 do_unassigned_access overhaul, Artyom Tarasenko, 2010/01/19
- [Qemu-devel] Re: sparc32 do_unassigned_access overhaul, Blue Swirl, 2010/01/20
- [Qemu-devel] Re: sparc32 do_unassigned_access overhaul, Blue Swirl, 2010/01/22
- [Qemu-devel] Re: sparc32 do_unassigned_access overhaul, Artyom Tarasenko, 2010/01/22
- [Qemu-devel] Re: sparc32 do_unassigned_access overhaul, Blue Swirl, 2010/01/23
- [Qemu-devel] Re: sparc32 do_unassigned_access overhaul, Artyom Tarasenko, 2010/01/23
- [Qemu-devel] Re: sparc32 do_unassigned_access overhaul, Blue Swirl, 2010/01/23