Resources and ACPI

[takawata at jp.freebsd.org]

In message <461CC586.5060507 at fromorbit.com>, Alan Garfield $B$5$s$$$o$/(B:
>takawata at jp.freebsd.org wrote:
>>> If the resources are allocated how do I access/see them?
>> 
>>     sc->sc_rid1 = 0;
>>     sc->sc_res1 = bus_alloc_resource_any(self, SYS_RES_IOPORT, &sc->sc_rid, 
>RF_ACTIVE);
>>     sc->sc_rid2 = 0;

Oops!
       sc->sc_rid2 = 1;


>>     sc->sc_res2 = bus_alloc_resource_any(self, SYS_RES_IOPORT, &sc->sc_rid, 
>RF_ACTIVE);
>>     value_af =   bus_space_read_8(rman_get_bustag(sc->sc_res2), rman_get_bus
>handle(sc->sc_res2), 1);
>
>Thanks for this, but how does on tell which resources have been 
>allocated to which other than manually specifying them with 
>bus_alloc_resource()?

Resource manager will do it. Device driver for a PnP aware bus will set
resource location for each device under the bus. At that time, the resource
is not allocated and activated. Then a device driver for a child device 
will allocate bus resource. rid parameter tells the order of resource you
want to get.