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| author | Eric W. Biederman <ebiederm@xmission.com> | 2006-09-26 10:52:38 +0200 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2006-09-26 10:52:38 +0200 |
| commit | 26374c7b7dca1ff90607c83d9b82e917119f0456 (patch) | |
| tree | e2557e7b679eeee6d361b08812f9b10b96a301ec /include/asm-x86_64/e820.h | |
| parent | 0136611c62e8650e354b95c76dff6d2ce6030eff (diff) | |
| download | op-kernel-dev-26374c7b7dca1ff90607c83d9b82e917119f0456.zip op-kernel-dev-26374c7b7dca1ff90607c83d9b82e917119f0456.tar.gz | |
[PATCH] Reload CS when startup_64 is used.
In long mode the %cs is largely a relic. However there are a few cases
like iret where it matters that we have a valid value. Without this
patch it is possible to enter the kernel in startup_64 without setting
%cs to a valid value. With this patch we don't care what %cs value
we enter the kernel with, so long as the cs shadow register indicates
it is a privileged code segment.
Thanks to Magnus Damm for finding this problem and posting the
first workable patch. I have moved the jump to set %cs down a
few instructions so we don't need to take an extra jump. Which
keeps the code simpler.
Signed-of-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'include/asm-x86_64/e820.h')
0 files changed, 0 insertions, 0 deletions
