John Baldwin wrote:
On Tuesday 11 July 2006 12:33, M. Warner Losh wrote:
In message: <[EMAIL PROTECTED]>
John Baldwin <[EMAIL PROTECTED]> writes:
: and OS X both of which I've written a PCI driver for) we require device
: driver writers to go through a lot more hoops to do certain things like
: allocate resources. At the very least there is much that can be improved
in
: our driver model.
bus_alloc_resources goes a long ways in this respect.
Yes, but in OS X I didn't even have to do that. All I had to do was ask it to
map a BAR if I wanted to use it. It already "allocated" all the resources
regardless. Windows was the same way (though a bit weirder, you get a
message that lists all your resources and you have to map them if you want to
use them).
--
John Baldwin
Do you mean that the kernel pre-allocate resources for all devices whether
a device has been attached by a device driver?
Does BIOS do the same thing before OS boots?
------------------------------------------------------------------------
From Beijing, China
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