Re: [MiNT] virtual address spaces

[Adam Kłobukowski <atari@gabo.pl>]

Frank Naumann napisał(a):
> Hello!
>
> > 1. Disk drivers
> >
> > Atm. disk drivers (XHDI) live outside the kernel. That means the are 
> > hard to be put into virtual address space.
>
>
> That's why the kernel overwrite the XHDI handler by a system call 
> wrapper. XHDI calls from user space applications are redirected to a 
> system call and handled inside the kernel (privilege checking, 
> restricted to root). So XHDI is no problem.

Ok, but still, driver lives outside kernel and is not even a process...

> > 3. Apps that have idea how memory looks, GEM protocols and pointer 
> > sharing....
>
> This must be global memory like at the moment with memory protection 
> enabled. Can be done as shared address space between all applications.
>
> > As I previously written about we need to separate our virtual machine 
> > into 2 worlds.
>
> I don't think we need two worlds. I think the existing mechanism are 
> sufficient. Legacy programs can be set to use global memory as it's 
> already the case for memory protection.
>
> The main problem are other things, all applications that use Super() for 
> example, or Supexec(), Setexc() and so on, then XBIOS calls for sound 
> and so on.

I do not understand. Do you want all processes to live in one memory space?

With Xbios, I understand the problem is that ew do not have all of it 
implememnted? We coul borrow some code from EmuTOS then.

--
Semper Fidelis

Adam Klobukowski
atari@gabo.pl