From owner-freebsd-hackers@FreeBSD.ORG  Wed Apr 11 11:48:36 2007
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To: Alan Garfield <alan@fromorbit.com>
From: takawata@jp.freebsd.org
In-reply-to: Your message of "Wed, 11 Apr 2007 21:24:54 +1000."
	<461CC586.5060507@fromorbit.com>
Date: Wed, 11 Apr 2007 20:48:04 +0900
Sender: takawata@init-main.com
Cc: acpi@freebsd.org, hackers@freebsd.org
Subject: Re: Resources and ACPI
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In message <461CC586.5060507@fromorbit.com>, Alan Garfield さんいわく:
>takawata@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.