Commit graph

8 commits

Author SHA1 Message Date
Michel Heily
acd0e4f338 cpu: Refactor instructions to use explicit cycle counting.
The way cycles were counted up untill now was not accurate enough,
I've avoided doing so because the instruction implementation looks
bloated this way, but I've had problems with cycle accuracy with tonc's
timer demo.

This is not entirely correct though, and I'm 100% sure there are some
mistakes, but works good enough for now.


Former-commit-id: 748faaf99fe2f42925c0a2110192c6a01e5d27d4
2019-08-08 20:05:09 +03:00
Michel Heily
c7dd713605 The big ioregs refactoring.
This commit refactors the ioregs:
* Use bitfield crate to implement the GPU ioregs.
* IoRegs are stored in their own variables bindings (i.e, Gpu related ioregs are now fields of the Gpu struct)
  - This optimize performance quiet alot from my testings - since every scanline was accessing deseralizing ioregs from sysbus. (Getting constant 59fps now)
* For now, comment out DMA model

Also, cleaned the code up to eliminate rustc warnings.


Former-commit-id: 9077695c446ebd1a71783acfdd9819245aa02d7a
2019-08-03 00:24:15 +03:00
Michel Heily
1b5626a1a7 armwrestler-fix: Refactor barrel shifter and fix ALU carry flag, hopefully for good.
Passing most of armwrestler ALU tests (still have bugs in UMULL and
SMULL)


Former-commit-id: 3c57ca9b5360b5c9bba74b00a5bede5a8cc496af
2019-07-26 17:55:50 +03:00
Michel Heily
009e46f6d5 armwrestler-fix: Properly handle misaligned addresses LDR/LDRH/LDRSH
Former-commit-id: 742a7c2b8413fa9d45df1575a0b14b8d1ab697c4
2019-07-22 20:25:40 +03:00
Michel Heily
2fb6f3c884 Implement (psr / usr bank) transfers for LDM_STM
Former-commit-id: 140e6a6c75f65f08f645b1a0ff2ca7c065438ce4
2019-07-22 09:21:49 +03:00
Michel Heily
c0d437b1a1 Fix exceptions and dataprocess mode change
Former-commit-id: 5892131496904b621398212b9dfc077242fa9557
2019-07-22 01:16:48 +03:00
Michel Heily
7501adfd12 Implement thumb17 (Swi)
Former-commit-id: 62d7e14e9b84e74d9236e1f0a5e961ae805f861c
2019-07-22 01:15:58 +03:00
Michel Heily
53115a9a58 Refactor core functionality into a separate module
Former-commit-id: 5d55b9eb0b63ed7c61465b4e814782165caa5002
2019-07-20 16:46:00 +03:00
Renamed from src/arm7tdmi/cpu.rs (Browse further)