Date: Sat, 20 May 2006 11:15:08 +0800 From: "william wallace" <avalonwallace@gmail.com> To: freebsd-hackers@freebsd.org Subject: Re: misc questions about the device&driver arch Message-ID: <87ab37ab0605192015h363ef74aw23dcc2d97721dea9@mail.gmail.com> In-Reply-To: <87ab37ab0511032030o134b9316j83295dd303e4e44b@mail.gmail.com> References: <87ab37ab0511032030o134b9316j83295dd303e4e44b@mail.gmail.com>
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about devclass_find_internal
devclass_find_internal will be called to create a new devclass in
such 2 conditions :
one is creating a new device , as : if (name) { dc =3D
devclass_find_internal(name, 0, TRUE);
another is in the function:devclass_add_driver. but ,if a driver 's
name is different from the name of any deviceclass in the system ,it
just create a new devclass ,and link it self into the parent
busdevice's driver link and do nothing .what is the use of the driver
at this situation?
On 11/4/05, kylin <fierykylin@gmail.com> wrote:
>
> hello every one :) good day!
> i have list the 3 puzzle coming to me in my recent coding reading of free=
bsd
> 0
> ///////////////
> pci bridge dynamic resize
> /////////////
> it seems that the device arch of freebsd is similar to what is revealed i=
n
> window OS. i have read the pcie hotplug tps of windows longhorn ,it is sa=
id
> that with some hardware mechanisms the pci bridge driver can do global pc=
i
> resource window reconfiguration.so good to the hotplugin pci device for i=
t
> avoid prelocating resource for the device .
> i wonder ,if the mem /io/irq reconfiguration possible under freebsd .:)
>
> 1
> //////////////
> is bus_data_generation
> /////////
> what idoes bus_data_generation for, is it the generation count for the
> device manager tree?
> void
> bus_data_generation_update(void)
> {
> bus_data_generation++;
> }
>
> 2
> //////////////
> pci_write_config vs pci_write_config_method
> //////////////
> under the source code /dev/pci .there are functions name pci_write_config
> (pcivar.h) and pci_write_config_method(pci.c)
> they both call the parent method ,though the content is different ,but do=
es
> that a liitle overlap whit each other?
>
>
> --
> we who r about to die,salute u!
--=20
we who r about to die,salute u!
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