There was a "v087r07pre" release that I unfortunately missed.
byuu says (about v087r07pre):
Creates the bsnes/processor folder. This has a shared ARM core there
which both the GBA and ST018 inherit.
There are going to be separate decoders, and revision-specific checks,
to support the differences between v3+.
In the future, I also want to move the other processor cores here:
- GBZ80 (GB, GBC)
- 65816 (SNES CPU, SA-1)
- NEC uPD (7725, 96050, maybe 7720 just for fun)
- Hitachi HG51B169
- SuperFX
- SPC700
- 65(C?)02
Basically, the GBA/ST018 forces my hand to start coding a bit more like
a multi-system emulator.
Right now, the ST018 is broken. Hence the pre. Apparently the GBA core
being used now has some bugs. So this'll be a nice way to stress-test
the GBA core a bit before we make it to ARMwrestler.
byuu says (about v087r07):
Both snes/chip/armdsp and gba/cpu use processor/arm now.
Fixed THUMB to execute the BL prefix and suffix separately. I can now
get the GBA BIOS stuck in some kind of infinite loop. Hooray ...
I guess?
byuu says:
GBA stuff re-added. Only thing missing that was there before is the ARM
branch opcode.
Since we're going to be staring at it for a very long time, I added
a more interesting test video pattern.
Went from 6fps to 912fps. Amazing what being able to divide can do for
a frame rate.
byuu says:
Fixing the PPU stepping increased FPS to 250. Promising, at least, since
the ARM core is still severely overclocked.
However, I reverted back to r02. This one patches gameboy/ and GameBoy::
to gb/ and GB:: and that's it.
Sorry, I just couldn't shake this bad feeling about the code. There were
some poorly hacked-together constructs. I'd rather just redo two days of
work than feel bad about the codebase for the next several years. Going
to attempt the GBA bridge again. Third time's a charm, I suppose (there
was a pre-r03 WIP I abandoned as well.)
This isn't unprecedented, GB core took a few attempts like this as well.
byuu says:
I wanted to keep this a secret, but unlike other recent additions, this
will easily take several weeks, maybe months, to show anything.
Assuming I can even pull it off. Nothing technically overwhelming here,
I'm more worried about the near-impossibility of debugging the CPU.
Tim Allen