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| author | gallatin <gallatin@FreeBSD.org> | 1999-05-29 19:47:51 +0000 |
|---|---|---|
| committer | gallatin <gallatin@FreeBSD.org> | 1999-05-29 19:47:51 +0000 |
| commit | 58ba6a68efa86520104001a99ce34ef2d3e62049 (patch) | |
| tree | b98cd3375b78df3b8fdfbb3fc11eeb82f44c9a46 | |
| parent | d6f941931f3b27efea5914acfb3a9276695a03e7 (diff) | |
| download | FreeBSD-src-58ba6a68efa86520104001a99ce34ef2d3e62049.zip FreeBSD-src-58ba6a68efa86520104001a99ce34ef2d3e62049.tar.gz | |
When memory mapping a PCI device (like XFree86 does) on an XP1000, we must
use ALPHA_PHYS_TO_K0SEG(offset) rather than just plain offet. I've verified
that this does not break other platforms (I've tested an AlphaStation 200
and a Personal Workstation 500au with this patch).
As to why this works, well.. Its black magic as far as I know. I obtained
this hack from Myricom, who in turn, obtained it from Compaq engineers.
Without this hack, XFree86 cannot talk to a PCI graphics card.
Reviewed by: Doug Rabson <dfr@nlsystems.com>
Obtained from: feldy@myri.com (Bob Felderman)
| -rw-r--r-- | sys/alpha/alpha/mem.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sys/alpha/alpha/mem.c b/sys/alpha/alpha/mem.c index 4abfcbb..4590752 100644 --- a/sys/alpha/alpha/mem.c +++ b/sys/alpha/alpha/mem.c @@ -38,7 +38,7 @@ * * from: Utah $Hdr: mem.c 1.13 89/10/08$ * from: @(#)mem.c 7.2 (Berkeley) 5/9/91 - * $Id: mem.c,v 1.6 1999/04/27 11:13:20 phk Exp $ + * $Id: mem.c,v 1.7 1999/05/25 19:32:53 dt Exp $ */ /* @@ -298,7 +298,7 @@ memmmap(dev_t dev, vm_offset_t offset, int prot) */ if ((prot & alpha_pa_access(atop((vm_offset_t)offset))) != prot) return (-1); - return (alpha_btop(offset)); + return (alpha_btop(ALPHA_PHYS_TO_K0SEG(offset))); } /* |
