[PATCH 0/6] add sysenter/syscall emulation for 32bit compat mode

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sysenter/sysexit are not supported on AMD's 32bit compat mode, whereas
syscall is not supported on Intel's 32bit compat mode. To allow cross
vendor migration we emulate the missing instructions by setting up the
processor state accordingly.
The sysenter code was originally sketched by Amit Shah, it was completed,
debugged,  syscall added and made-to-work by Christoph Egger and polished
up by Andre Przywara.
Please note that sysret does not need to be emulated, because it will be
exectued in 64bit mode and returning to 32bit compat mode works on Intel.

This has been tested with GETPIDs in a tight loop in compat mode on both
Intel and AMD boxes. Additionally a 32-bit userland was booted under a
64-bit kernel and then cross-vendor migrated.

Please apply or comment ;-) 

Regards,
Andre.

Signed-off-by: Amit Shah <amit.shah@xxxxxxxxxx>
Signed-off-by: Christoph Egger <christoph.egger@xxxxxxx>
Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>


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