[Bug 37355] Multiple software protection schemes need ntoskrnl ' MmMapLockedPagesSpecifyCache' implementation (Tages Protection v5.x, BattleEye's 'bedaisy.sys')

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=37355

--- Comment #11 from Anastasius Focht <focht at gmx.net> ---
Hello Derek,

--- quote ---
I have no experience in wine development, but I do not understand why Linux
would need a kernel driver to implement this funtion.  Doesn't everything run
under wine run in userspace?
--- quote ---

the term 'kernel driver' refers to the Windows terminology.
Unless explicitly stated otherwise, Windows terminology is used when talking
about technologies, software architecture etc.
There exist kernel and userspace drivers on Windows. Nowadays MS provides
Kernel-Mode Driver Framework (KMDF) and User-Mode Driver Framework (UMDF) to
ease development.

Under Wine the kernel driver PE binaries are mapped in userspace into
'winedevice' hosting process (Windows has a similar concept of a host process
for usermode drivers), and the code is executed in user mode like any other
Linux process. That's how Wine works by design.

This is in contrast to the 'ReactOS' project (https://www.reactos.org/) where
these kernel drivers are running in kernel space/mode, exactly as in Windows.

There is another project called 'Longene' which claims to be a hybrid, that is
providing infrastructure in Linux kernel to run Windows kernel drivers indeed
in Linux kernel address space (https://en.wikipedia.org/wiki/Longene).
That project was ill-fated from start (disclaimer: personal opinion) and seems
abandoned now.

Regards

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