New 68k-JIT for ARM in development

[mschulz]

Originally Posted by Romanujan

How about running this on MiSTer? Would it be possible to utilize it’s chipset implementation in FPGA?

If someone would attempt to port it to the ARM cpu running on MiSTer then yes, why not. I am however focused on other platforms.

Originally Posted by Romanujan

Is the MMU support planned?

Not at this moment. Right now complete CPU support including FPU are the main priority. Maybe later, but I am not sure.

[mschulz]

Originally Posted by skan

This is damn cool! I'm eager to see how this project evolves.

I hope it will get to a point where I can transparently run entire m68k AROS on it, without user or developer notifying any difference. The feeling should be to have RasPi with damn fast m68k CPU (at the moment about 1400 SysInfo MIPS on RasPi4)

Originally Posted by skan

In simple words, how does it compare to this http://eab.abime.net/showthread.php?t=90316 ?

Bloodline's project is bare metal Amiga hardware emulator using open source CPU emulation (no JIT, though). He aims at running unmodified OS3.x on it. The CPU core out there attempts to emulate different m68k models with better precision.

My project is pure bare metal m68k JIT emulator with speed in mind. It translates entire blocks of m68k code into ARM opcode stream and executes it. The main goal and highest priority is the raw CPU speed, therefore it unrolls loops if possible, attempts to avoid branches to subroutines by inlining them directly, uses dynamic register mapping etc. There are some reductions of emulation precision though. For example, the m68k condition codes are calculated only if the subsequent instruction does not modify them. The fpu will be only 64bit too. There is no emulation of specific m68k model, I just attempt to translate as many opcodes as possible. Besides, the m68k emulation does not create any special m68k address space, e.g. the instruction

movea.l 4.w, a0

will be most likely translated to something like

mov r0,#4
ldr r1,[r0]

provided the dynamic register allocator selected r0 to be a temporary register and r1 to be a mapped m68k's A0 register.

[mschulz]

Originally Posted by Marlon_

Also, bloodline and mschulz has communicated about this stuff before: http://eab.abime.net/showthread.php?t=96407

Specific comment touching this subject: http://eab.abime.net/showpost.php?p=1306277&postcount=4

Exactly. Funny to say, the "toy" idea, i.e. running the m68k emulation on RasPi directly seems to be now the main idea behind the project - instead of running ARM BE AROS on RasPi there will be M68K AROS on RasPi

[Marlon_]

Originally Posted by mschulz

instead of running ARM BE AROS on RasPi there will be M68K AROS on RasPi

Why not both?

[skan]

Originally Posted by Marlon_

Why not both?

This.

...and seamless JanusUAE integration.
Well, THAT would be a perfect NG Amiga... for just 50 bucks!

[mschulz]

Emu68 is going AArch64! The 32bit ARM version and the 64bit one will be developed in parallel. The correct one will be automatically picked up by the RaspberryPi upon boot.

https://www.patreon.com/posts/32705355

Happy New Year!

[Gaula92]

Originally Posted by mschulz

Emu68 is going AArch64! The 32bit ARM version and the 64bit one will be developed in parallel. The correct one will be automatically picked up by the RaspberryPi upon boot.

https://www.patreon.com/posts/32705355

Happy New Year!

Wow! This is SO great!!! Cant wait to boot Aros68K on the Pi in 64bit mode!! (I have been running my own GNU/Linux system in 64bit mode/armv8 for years now, and its faster than 32bit mode on the same Pi3b+).
This will be on par with the AWESOME Risc OS we already have.

Will Aros68K on the Pi be able to run Amiga OCS/ECS/AGA games? I mean.. will you provide some kind of chipset emulation?

[Samurai_Crow]

Based on what I've seen, it's only a processor JIT like Petunia on OS4 and Trance on MorphOS. Chipset needs separate emulation whether it be FPGA-based or software.

[fryguy]

Any news on this?

[Samurai_Crow]

https://github.com/michalsc/Emu68 was last committed to in April. I've spoken to Dr. Schulz on Discord and it will get finished eventually.

[mschulz]

Originally Posted by Samurai_Crow

https://github.com/michalsc/Emu68 was last committed to in April. I've spoken to Dr. Schulz on Discord and it will get finished eventually.

Some status update. You may also browse older news if you like
https://www.patreon.com/posts/44011241

[Samurai_Crow]

Thanks for the update, MSchulz!

[bebbo]

don't forget to replace the RasPi with a MacBook Pro with the new M1 cpu...

[mschulz]

Originally Posted by bebbo

don't forget to replace the RasPi with a MacBook Pro with the new M1 cpu...

At some point? Definitely! The M1 seems to deliver what it promised I hope we will see kvm for aarch64 there.

[skan]

1400 MIPS... Along with a RPi CM4 and a PiStorm-like solution, this would make a niiiice accelerator for a 1200!

[Promilus]

Well M1 and future M1X are definitively most powerful general purpose ARM chips out there but unfortunately (in contrast to RPi4) not exactly someone might consider cheap ... But it is on affordable level.

[skan]

Originally Posted by Promilus

Well M1 and future M1X are definitively most powerful general purpose ARM chips out there but unfortunately (in contrast to RPi4) not exactly someone might consider cheap ... But it is on affordable level.

A Mac Mini is *slightly* more expensive than a Pi anyway...

Sorry for the OT, just wondering... is there such a thing as a PowerPC emulation (baremetal or otherwise) on ARM / RPi?

[mschulz]

Few updates regarding Emu68 (and PiStorm):

https://www.patreon.com/posts/54448728

https://www.patreon.com/posts/54508325

[Samurai_Crow]

@mschulz
Thanks for the updates!

[Romanujan]

I thought the project is dead. Nice to see it is still being worked on!