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ableos/sysdata/programs/ps2_driver/README.md
peony 8f265ebf40 PS/2 literally almost work
2024-11-17 22:59:05 +01:00

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Unified PS/2 Driver

Te entire thing is held together inspite

!!Assumptions!!

Anyone who works on this should work to keep this list as small as possible/remove as many of these as possible.

  • Bit 5 of the response form 0x64 indicates which port the data is coming from. (Not true on all systems)
  • A parity or timeout error never occurs.
  • PS/2 controller exists.
  • Both PS/2 ports being broken doesn't need handling.
  • One PS/2 port being broken doesn't need special attention.
  • PS/2 controller doesn't need to perform a self-check.
  • These DeviceIDs never exist:
    • 0xFFFD
    • 0xFFFE
    • 0xFFFF
    • 0x01xx
    • 0x03xx
    • 0x04xx
  • Literally all PS/2 keyboards can be handeled the exact same way. We have the capability for detecting different keyboard types, I just don't bother with it because that would litreally take months to get working.
  • The device doesn't send any data while we're waiting for an ACK.

Supporting mice in the keyboard port and vice versa was a bad idea, but I do not regret it because it means we're "superior" to real world operating systems.