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.

1 files changed, 2 insertions, 1 deletions

diff --git a/sys/pci/if_tireg.h b/sys/pci/if_tireg.h
index 65483a2..09b1982 100644
--- a/sys/pci/if_tireg.h
+++ b/sys/pci/if_tireg.h
@@ -29,7 +29,7 @@
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  * THE POSSIBILITY OF SUCH DAMAGE.
  *
- *	$Id: if_tireg.h,v 1.7 1999/07/23 02:17:59 wpaul Exp $
+ *	$Id: if_tireg.h,v 1.8 1999/07/23 18:46:24 wpaul Exp $
  */
 
 /*
@@ -1107,6 +1107,7 @@ struct ti_jpool_entry {
 struct ti_softc {
 	struct arpcom		arpcom;		/* interface info */
 	bus_space_handle_t	ti_bhandle;
+	vm_offset_t		ti_vhandle;
 	bus_space_tag_t		ti_btag;
 	void			*ti_intrhand;
 	struct resource		*ti_irq;