Since QNX system architecture (microkernel) is quite different from Linux (monolith), I wonder how far that would get 
you ...


-- Michael


________________________________
From: lin xiang <community-noreply@qnx.com>
Sent: Thursday, September 7, 2023 05:53
To: ostech-core_os
Subject: emulate linux kernel api

It's possible and an good idea to emulate linux kernel api, that will make port linux driver to qnx more easy.
freebsd and netbsd have an linux emulator, but that seems mainly for run linux application directly.



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> It's possible and an good idea to emulate linux kernel api, that will make 
> port linux driver to qnx more easy. 

Linux kernel API? I have never seen one.
Or do you mean the sum of all functions and macros, a special Linux Kernel configuration provides?

Well, since hardware is not documented any more and chip makers patch their stuff in the Linux Kernel only, driver 
developers need to be creative.

To answer your question, using unchanged Linux Kernel driver code is already done under QNX.
Actually Intel Graphics needs the drm-intel resource manager, emulating half of the Linux-Kernel, to use a million of 
unchanged lines of Linux Driver Code from Intel.
# drm-intel -v
i915/DRM Linux kernel 4.14.14
# 

If you like to use that emulation code, simply ask Blackberry for the source of drm-intel. 

From my point of view this approach is very ugly, but indeed a  cool demonstration of the QNX mircokernel architecture, 
allowing to hide a Linux Kernel in one resource manager process and for example a NetBSD Kernel in an other process to 
realize a TCP/IP stack.


> freebsd and netbsd have an linux emulator, but that seems mainly for run linux
>  application directly.

freebsd and netbsd utilize a Linux binary compatible trap-Interface. Yes, this is for using Linux userland stuff.
So you can bootstrap a GNU/Linux OS, like debian, normally using a Linux-Kernel, without a Linux Kernel.