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From: John Baldwin <jhb@freebsd.org>
To: John-Mark Gurney <gurney_j@resnet.uoregon.edu>
Date: Tue, 8 Aug 2006 13:42:51 -0400
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Cc: freebsd-hackers@freebsd.org
Subject: Re: jkh weird problem (reading pci device memory)
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On Monday 07 August 2006 18:05, John-Mark Gurney wrote:
> 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...

Then why are folks adding these macros to things like mpt?

-- 
John Baldwin