edk2 | EDK II

Upon deciding to write a simple "Hello World!" program in EDK2, I stumbled upon the following problem:

As I am using a serial connection for debugging, the output of the debug functions like DebugPrint successfully get redirected to my serial terminal (PuTTY in this case), well sort of.

After compiling an executing the following program inside an UEFI shell, I simply get an empty line as a result. But after executing the same binary again, the line gets successfully printed in all it's beauty.

This is the source code of the program i ran:

Currently I am trying to use the C standard library in my EDK2 project. As my Visual Studio 2019 did not automatically add the necessary include directories, I manually added the following folders to my include directories:

I want to learn more about firmware developement. I already know how to write assembly programs for the old BIOS and now I wanted to start with UEFI. I managed to compile and emulate a Hello World program, and now I was trying to write a program which displays on the screen the current time using the Runtime Service GetTime(). However when I use this function the program hangs, as if it wasn't installed during PI. Here is the code:

I have heard its a conventional practice to store program dependent files in /usr/share/application-folder in linux. So I'm trying to do it in my c program in a function called load_interface_files() for example. I am not sure if this is a good practice or not, I've heard about creating configuration files for this kind of issues.

Anyways, here's the the code I wrote to make a directory in /usr/share.

I have a Windows 10 Pro virtual machine using KVM. It is set up through virt-manager using the latest version of libvirt and QEMU. All of this is running on Manjaro Linux 20. Manjaro defaults to using PulseAudio for its audio output (at least for Manjaro 20). I was wondering if there is a way to use PulseAudio with libvirt/QEMU/KVM to have an audio pass-through from the guest OS to the host. Meaning that anything that is playing in the Guest OS will need to be heard through the default output device in Manjaro Linux. First, I tried setting environment variables to set it up, but that didn't work, and it also is deprecated past QEMU 4.1 (I am using 5.1.) Then, I tried using this tutorial, which ended up somehow bricking Manjaro, and I had to reinstall. I am currently using the default Spice server through virt-manager. I have heard that the Spice server introduces lots of overhead, and I can't afford that. I need every CPU cycle, and if PulseAudio is already running, I may as well use it. My libvirt XML config WITHOUT the Spice server is as follows:

I am trying to create a efi app by manually compiling and linking the source code with MS's VC compiler and MS's Linker.

The source code compiles fine but I get a linker error:

I am a novice in C and trying to amend and compile an EDK2 EFI program.

The program portion I want to change has a function MsgLog which takes a Char16 * variable and uses this to write to a log file.

The current code has this

Hi I'm using edk2 to write a boot service for a kernel and need to apply AllocatePages service to apply memory with type as EfiConventionalMemory.

However, it returns an error code of EFI_INVALID_PARAMETER.

I looked into the source code from git, the actual function is as follow:

I want to know when I need to free a pointer that is returned from EFI functions