My helper classes are not used for driver matching and stuff like that.
I already have things in place for driver.
I am going to add support for another hardware, and it has very little difference.
so my single driver class can will handle it.
There is very few card-hardware specific stuff, so I have now one abstract class and 2 diff class for each one. These are just helper classes not the driver classes.
I don't need IOService and also multiple kext binaries.
I was curious so, I checked that OSObject size is just 8 bytes.
So I can use the OSObject as my base class.
Like
OSObject
|
HBA_Class ( abstract one)
|
--------------------------------------------
| |
HBA_TYPE1 HBA_TYPE2
and will use OSTypeAlloc() method to create and object and release() to free the object.
Parav
Godfrey van der Linden <email@hidden> wrote:
OSObject doesn't come with that much overhead. It implements a reference counting mechanism and that is about it.
However that isn't really the issue. You will need to implement at least one object that IS an IOService subclass otherwise your drivers wont match. Since multiple inheritance is not allowed it means that your abstract class will probably need to inherit from IOService. Fortunately this is exactly the model that Families provide and you can use our Family infrastructure to help you, It may even be possible to deliver your project as three kexts, a family and 2 driver kexts.
Finally if you don't inherit from OSObject (or IOService) then you can use 'new' or even just create static or automatic classes. Remember thought that you will have significant binary compatibility issues if you split your code into mul!
tiple
kexts.
> Hi, > > have one abstact class which represent my HBA card. > and 2 other classes derived from this abstract class. > Each one for different HBA. > > This is not a driver class. It is just helper class. > > This absract class is NOT derived any IOService or > OSObject or any other OS classes. > > But I need the inheritance capability. > > My question is : > How to create an instace of this independent class? > > Can I use the "new" operator? > > Or should I derive from OSObject? > But I don't want that big overhead for small > functionalies. > > Or something else? > > Regards, > Parav > > > > >
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