This is a working c++ cmake project to compile uefi apps on Linux with clang.
If you do not have NixOS then skip the nix-shell and instead install
the dependencies listed in the shell.nix file.
$ git clone git@github.com:Luis-Hebendanz/uefi-cmake-template.git
$ cd uefi-cmake-template
$ nix-shell shell.nix
$ mkdir build && cd build
$ cmake ..
$ makeThis should output a binary called BOOTX64.EFI.
Now create an iso image by executing the shell script create_iso.sh.
Afterwards boot into qemu by executing ./run.sh.
The current efi headers are from the efi specification 2.8. If you want to update them
checkout the edk2 and copy the contents of the folder
edk2/MdePkg/Include to include/UEFI. Then patch one line in include/UEFI/x64/ProcessorBind.h
from typedef unsigned short CHAR16; to typedef wchar_t CHAR16;.
You should probably also update bios.bin by building OVMF from edk2
You can inspect the generated assembly by executing make src/main.s
and then viewing the generated asm file with your favourite editor.