Date: Mon, 26 Jul 1999 20:54:52 -0700 (PDT) From: Bill Paul <wpaul@FreeBSD.org> To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/pci if_tireg.h Message-ID: <199907270354.UAA60081@freefall.freebsd.org>
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wpaul 1999/07/26 20:54:52 PDT
Modified files:
sys/pci if_tireg.h
Log:
On FreeBSD/i386, when you use the SYS_RES_MEMORY resource to allocate
a PCI memory mapped region, rman_get_bushandle() returns what happens
to be a kernel virtual address pointing to the base of the PCI shared
memory window. However this is not the behavior on all platforms:
the only thing you should do with the bushandle is pass it to the
bus_spare_read()/bus_space_write() routines. If you actually do want
the kernel virtual address of the base of the PCI memory window, you
need to use rman_get_virtual().
The problem is that at the moment, rman_get_virtual() returns a physical
address, which is bad. In order to get the kernel virtual address we
need, we have to play with it a little.
Presumeably this behavior will be changed, but in the meantime the
Tigon driver won't work. So for the moment, I'm adding a kludge to
make things happy on the alpha: the correct kernel virtual address
is calculated from the value returned by rman_get_virtual(). This
should be removed once rman_get_virtual() starts doing the right
thing.
This should make the Tigon actuall work on the alpha now.
Revision Changes Path
1.9 +2 -1 src/sys/pci/if_tireg.h
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