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Date: Mon, 7 Aug 2006 15:05:51 -0700
From: John-Mark Gurney <gurney_j@resnet.uoregon.edu>
To: John Baldwin <jhb@freebsd.org>
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Cc: freebsd-hackers@freebsd.org
Subject: Re: jkh weird problem (reading pci device memory)
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John Baldwin wrote this message on Mon, Aug 07, 2006 at 15:27 -0400:
> 	sc->cfg_table.signature = letoh32(bus_read_4(sc->bar.res, 0));
> 	sc->cfg_table.version = letoh16(bus_read_2(sc->bar.res, 4));
> 	sc->cfg_table.dummy = bus_read_1(sc->bar.res, 5);

Note that this may or may not be correct...  the bus_read_X macros
do endian conversion if the bus is of different endianness than the
processor arch...  So if the device is on a PCI bus, and the machine
is sparc64, the bus_read_X will already be swapped as necessary... If
you don't want the byte swapping to be done for you, there are the
_stream versions...  The are useful for transfering data like disk
data that needs to maintain the same order...

-- 
  John-Mark Gurney				Voice: +1 415 225 5579

     "All that I will do, has been done, All that I have, has not."