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section on input structure and possible explanation for 6-24 error
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'''/dev/di''' is the [[IOS]] driver used to control the disc drive. This documentation is mostly based on the most recent version (dated Jun 3 2009 07:49:09 and included in [[IOS58]] and [[IOS80]]). Names are based on function names found in Nintendo titles (which print an error message including the name if the Ioctl or Ioctlv fails). DVDLowRequestAudioStatus and DVDLowAudioStream are not found in Wii titles, but the names can be found in [https://wiki.dolphin-emu.org/index.php?title=Ships_with_Debugging_Symbols debug symbols included in various Gamecube games].
'''/dev/di''' is the [[IOS]] driver used to control the disc drive. This documentation is mostly based on the most recent version (dated Jun 3 2009 07:49:09 and included in [[IOS58]] and [[IOS80]]). Names are based on function names found in Nintendo titles (which print an error message including the name if the Ioctl or Ioctlv fails). DVDLowRequestAudioStatus and DVDLowAudioStream are not found in Wii titles, but the names can be found in [https://wiki.dolphin-emu.org/index.php?title=Ships_with_Debugging_Symbols debug symbols included in various Gamecube games].
+== Input structure ==
The input to all /dev/di commands (other than enable DVD video) is the following struct, which must be sized 0x20 and aligned 4:
The input to all /dev/di commands (other than enable DVD video) is the following struct, which must be sized 0x20 and aligned 4:
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(DiIoctl) Note: This is normal for DVD software before 6-24
(DiIoctl) Note: This is normal for DVD software before 6-24
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+This probably means IOCTL numbers were created on June 24th of some year.
== Return values ==
== Return values ==
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=== 0x8A DVDLowReset ===
=== 0x8A DVDLowReset ===
−Resets the drive, using [[IOS/Syscalls|syscalls]] 0x44, 0x45, and 0x46. If a reset is already in progress (syscall_check_di_reset returns true), then it immediately calls syscall_deassert_di_reset; otherwise, it calls syscall_assert_di_reset, waits 12µs, and then calls syscall_deassert_di_reset. Afterwards, registers are reset in the same way as DVDLowNotifyReset other than the cover interrupt. The cover interrupt is temporarilly disabled during this process, but is reenabled afterwards if it was enabled before.
+Resets the drive, using [[IOS/Syscalls|syscalls]] 0x44, 0x45, and 0x46. If a reset is already in progress (check_di_reset returns true), then it immediately calls deassert_di_reset; otherwise, it calls assert_di_reset, waits 12µs, and then calls deassert_di_reset. Afterwards, registers are reset in the same way as DVDLowNotifyReset other than the cover interrupt. The cover interrupt is temporarilly disabled during this process, but is reenabled afterwards if it was enabled before.
Enable spinup is passed to syscall 0x4e, which activates the DI_SPIN [[Hardware/Hollywood_GPIOs|GPIO]] if it is 0 and disables it otherwise.
Enable spinup is passed to syscall 0x4e, which activates the DI_SPIN [[Hardware/Hollywood_GPIOs|GPIO]] if it is 0 and disables it otherwise.