[okl4-developer] Sharing a driver between vservers

[Jamie Lennox]

Hi,

My situation is i'm trying to write okl4 drivers that will handle a 
keyboard and mouse in x86. Too make it expendable i have my vkeyboard 
and vmouse servers. However in the case of PS/2 both are run through the 
same 8042 chip. This means i need some form of lock when they are operating.

My understanding is that there is a single thread per vserver and the 
vserver are linked against each other so can call each other directly 
(no ipc). Meaning if i linked vkeyboard and vmouse against the same 
driver then i am linking against different instances of the same driver 
and so cannot share a lock that way.

My question i suppose, is there some way to link both vservers to the 
same 8042 driver instance so i can do my own synchronization?

I realise i can create a memsection with a lock and pass this to both 
drivers, however this problem is really only applicable in this case and 
so i would prefer not to do it that way.

I suppose i can use the naming server to share a memory section, but i 
understand this is being phased out in favour of elfweaver.

I'm not sure if i can do it in elfweaver as i dont want the memory if 
neither driver is employed, and i dont want it created twice in the 
instance of both (and would prefer not to hack it up to do checks in the 
root of the build system).

Those are my options i know of. Is there another (nicer) way?

Jamie.

PS. Still wondering about using something other the device_if.di for 
creating drivers.