These instructions were already implememented by Dolphin, but never added to the manual. Extension instructions will be handled in a later commit, as wlil instructions that were not previously implememented by Dolphin.
The actual documentation for registers is not changed in this commit; nor are any new registers added. This is purely to make later diffs more readable.
The GFDL requires the history section to be updated. Although there was no actual release, this makes it attribution clearer and separates it from my changes.
The existing manual is nice to read and get up to speed on things,
however it has one major problem. It's actually a pain to extend or
modify, despite being released under the GNU documentation license: It's
in PDF format.
I've taken the time to reproduce what the document more-or-less looks
like in order to allow extending the document using open-source tools
while also using a more general solution like LaTeX, which can generate
the document into multiple formats if desirable.
This should make extending the document much easier (and not lock the
information into one concrete format).
This could cause the first branch of the bootucode procedure, which
takes its parameters from the AX registers, to run during the ROM init
sequence. Since the ROM doesn't set any of the AX registers, the values
aren't meaningful, and can cause bad DMA transfers and crashes.
This file is MIT licensed due to Gecko OS being MIT licensed.
Add authors of original codehandler
Add MIT notice to codehandler
Update copyright year for codehandler
Add where original source came from
Codehandler Source Code Added.
- coef: Explicitly set 23 different values that are used by GBA UCode,
and tweaked overall parameters to more closely match those 23 values.
- irom: Moved a few functions to their proper places, updated BootUCode
to configure DMA transfers using AX registers as well as IX registers
(the GBA UCode uses this to do two sequential transfers in one call),
and added partial functions used by GBA UCode.
All functions were reverse-engineered solely based off of observed
effects on the virtual machine: register states before-and-after, dmem
interactions, and DMA transfers. The specific coefficients were observed
being read from dmem, and must be exactly those values to function
properly. I have no knowledge of how the official ROM implements these
functions, or how it is implemented overall.
Tested with The Legend of Zelda: Four Swords Adventures, Final Fantasy
Crystal Chronicles, and Billy Hatcher and the Giant Egg (to download
ChuChu Rocket!).
