[Stormdos-develop] tasks.txt

[Juras <yb...@tu...>]

Hello stormdos-develop,

Processes are:


1) kernel (starter, the first thread which loads shell etc. - it has limited
address space, because it is then shared to all processes)
2) drivers
3) applications


Processes are characterized by their own address space, but
sharing kernel address space and having some addresses reserved
by DLLs.

Drivers are executed at 0 priviledge level. Each driver executes
on its own address space and has at least one thread.

Applications use drivers by sending messages.

Memory sharing (for drivers to be able to write to it) is provided
by the kernel in the following way:

 1) application registers a memory handle with BASE and SIZE in the address space
 of the process. (the kernel translates it into physical BASE and SIZE)
 2) drivers get this handle via a message and LOCK it, the kernel
 allocates pages mapped to the physical ones specified by the handle.
 3) drivers unlock it.
 4) application unregister the handle.

 
-----------------------------------


1) one TSS for kernel/app/drivers/vm86
  and software multi-tasking (stack-based)
  
2) TSSes for exceptions  

-- 
Best regards,
 Juras                          mailto:yb...@tu...