Accessing ROMs from libpciaccess

[Michael <macallan%netbsd.org@localhost>]

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Hello,

I just committed a fix for libpciaccess's ROM access method. It used  
to just open /dev/mem, mmap(ROM_BASE) and crossfingers hoping physical  
addresses are the same as bus addresses on the machine it's running.  
Obviously this assumption is false on many non-x86 machines ( sparc64  
for example ) but the fix is simple - use the same mechanism as  
pci_device_netbsd_map_range().
This should work as before on x86, additionally it should work on all  
other ports as well - here's an example from sparc64:
(II) RADEON(1): Attempting to read un-POSTed bios
(WW) RADEON(1): Not an x86 BIOS ROM image, BIOS data will not be used
no kidding, it's an xvr-100 with Sun firmware.
I have a mach64 card with PC firmware in the same box but the driver  
is unable to cold start it and int10 isn't built by default - I'll  
look at that next.
On macppc int10 crashed with a SIGBUS trying to muck with an R128's  
ROM, in LockVGA() - let's see how much work it takes to get the x86  
emulator running.
That said, please test it, on x86 nothing should change ( unless you  
have a machine with several independent PCI buses - these should work  
now )
On non-x86 you should see at least some acknowledgement that the ROM  
isn't what the driver expected, if it's not a PC BIOS.

have fun
Michael

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