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author | peter <peter@FreeBSD.org> | 2003-11-22 01:11:07 +0000 |
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committer | peter <peter@FreeBSD.org> | 2003-11-22 01:11:07 +0000 |
commit | 5d06137397cc0869db52c0ca96423fe73cd0fae0 (patch) | |
tree | a2874ad8c980e241e92be4babe479a720531a302 /sbin | |
parent | 75a8ab1efd9c3919ca3e70304a850b5774766e95 (diff) | |
download | FreeBSD-src-5d06137397cc0869db52c0ca96423fe73cd0fae0.zip FreeBSD-src-5d06137397cc0869db52c0ca96423fe73cd0fae0.tar.gz |
Argh! The Athlon64 and Opteron only implement 40 bits of address space in
the MTRR Base/Mask registers. If you use the documented algorithm in the
systems programming guide, you'll get a GPF. The only thing that has
prevented this so far is that the bios pre-sets some MTRR entries which
we mis-interpreted sufficiently to fool the memcontrol interface into
thinking all the address space was taken and therefore rejected XFree86's
requests. However, not all bioses do this.. You get an insta-panic in
that case. Grrr. A better fix (dynamic mask) will happen by 5.3/5-stable
so that we automatically adapt to more than 40 physical bits.
Approved by: re (scottl)
Diffstat (limited to 'sbin')
0 files changed, 0 insertions, 0 deletions