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Re: [Qemu-devel] Which qemu ports actually work?
From: |
Torbjorn Granlund |
Subject: |
Re: [Qemu-devel] Which qemu ports actually work? |
Date: |
Thu, 28 Oct 2010 10:32:38 +0200 |
User-agent: |
Gnus/5.11 (Gnus v5.11) Emacs/22.3 (berkeley-unix) |
Alexander Graf <address@hidden> writes:
> Please also keep in mind that PPC emulation is _very_ slow.
>
> Why is it slow?
Because we're flushing the TLB on almost every MMU opcode.
OK. Does that mean the TLB never gets more than a single entry?
(I mean, do you flush the TLB before inserting a new entry into it?)
What is the reason for this flushing?
A related thing, related to cross endianess: I wrote a simulator many
years ago (around 1990) that turned memory "upside down" for cross
endianess. I.e., a reference to address x was simulated as
*(memend-opsize-x), where memend points to the end of the area
simulating memory, opsize of the size in bytes of the operation.
The point of this is that one can use full-size native load or store
instructions, instead of many byte operations and shifts.
I never published this idea, but I assume it has been rediscovered and
is now a standard trick?
[Alex, excuse the duplicate, this message was bounced by nongnu.org's
MTA for bogus reasons. It never appeared on the list.]
--
Torbjörn
- Re: [Qemu-devel] Which qemu ports actually work?, (continued)
- Re: [Qemu-devel] Which qemu ports actually work?, Torbjorn Granlund, 2010/10/26
- Re: [Qemu-devel] Which qemu ports actually work?, Alexander Graf, 2010/10/26
- Re: [Qemu-devel] Which qemu ports actually work?, Torbjorn Granlund, 2010/10/26
- Re: [Qemu-devel] Which qemu ports actually work?, Alexander Graf, 2010/10/27
- Re: [Qemu-devel] Which qemu ports actually work?, Torbjorn Granlund, 2010/10/27
- Re: [Qemu-devel] Which qemu ports actually work?, Alexander Graf, 2010/10/27
- Re: [Qemu-devel] Which qemu ports actually work?, Torbjorn Granlund, 2010/10/27
- [Qemu-devel] Re: Which qemu ports actually work?, Paolo Bonzini, 2010/10/27
- Re: [Qemu-devel] Which qemu ports actually work?, Alexander Graf, 2010/10/27
- Re: [Qemu-devel] Which qemu ports actually work?, Torbjorn Granlund, 2010/10/27
- Re: [Qemu-devel] Which qemu ports actually work?,
Torbjorn Granlund <=
- Re: [Qemu-devel] Which qemu ports actually work?, Alexander Graf, 2010/10/28
- Re: [Qemu-devel] Which qemu ports actually work?, Blue Swirl, 2010/10/27
- Re: [Qemu-devel] Which qemu ports actually work?, Torbjorn Granlund, 2010/10/27
- Re: [Qemu-devel] Which qemu ports actually work?, Artyom Tarasenko, 2010/10/28
- Re: [Qemu-devel] Which qemu ports actually work?, Torbjorn Granlund, 2010/10/28
- Re: [Qemu-devel] Which qemu ports actually work?, Artyom Tarasenko, 2010/10/28
- [Qemu-devel] Re: Which qemu ports actually work?, Paolo Bonzini, 2010/10/26
- Re: [Qemu-devel] Re: Which qemu ports actually work?, Stefan Weil, 2010/10/26
Re: [Qemu-devel] Which qemu ports actually work?, Stefan Weil, 2010/10/26