hdaudio-uefi

An attempt to port the RedoxOS HD Audio driver to pure Rust, with no standard library. Currently in progress towards basic first goal of nightly Rust for x86_64 UEFI, which has part of the standard library, then work to port that to no_std:

• x86_64-unknown-uefi (nightly, with std)
• x86_64-unknown-uefi (stable, no_std)
• x86_64-unknwon-unknown (no_std, stable, possibly no_alloc?)

TODO

• Re-implement original syscall::* interfaces from original redox-drivers repo.
  • syscall::physmap
  • syscall::physalloc
  • syscall::physfree
  • syscall::setrens
  • syscall::fmap
  • syscall::open
  • syscall::close

Running

• cd hdaudio
• cargo +nightly build --target x86_64-unknown-uefi
• cd ..
• ./qemu.sh
• once inside QEMU
• FS0:
• .\ihdad.efi

Current Problems

• Gets caught on cmdbuff.rs:282
  • Reads forever.
  • Writes appear to get through when -device intel-hda,debug=5 is set.
  • Also tried with redoxos's own instructions during boot, which uses -device ich9-intel-hda,debug=5, with no avail.
  • But reading back is never the expected value.
  • Debug shows error with addressed non-existing codec, which does not happen on RedoxOS's live image.
  • It could have something to do with IRQs, but I'm not entirely sure.