FEX page size requirement

[ChanthMiao]

Problem

I am trying to port FEX in a alpha like architecture, which is 8k pagesize only.

It seems that FEX requires 4k pagesize. I implement MemAllocator8k and MemAllocator8k32Bit to handle guest memory syscall.

Currently, the biggest question for me is that what compements of FEXt self , except the guest syscall handler, depends on 4k pagesize.

[Sonicadvance1]

FEX itself outside of the allocators make only a few 4K pagesize assumptions, this is because implementing x86 emulation on any platform that doesn't support 4k pagesizes is always going to be a hack.
While we're trying to remove most 4k pagesize assumptions for our Wine support, there is probably still some missing depending on where you look.

[ChanthMiao]

It seems that the FEXCore::Allocator requires 4k pagesize?

[ChanthMiao]

@Sonicadvance1
Do you know the pagesize requirements of OSAllocator_64Bit and ForwardOnlyIntrusiveArenaAllocator?
Is it safe to modify them to work in a 8k pagesize platform?

[neobrain]

Development discussion is best done on FEX's Discord.

For 4K page size emulation, see #1921 .