On 06/17/2009 04:50 PM, Andre Przywara wrote:
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 ;-)
Looks good except for the limit thing I pointed out. If the correct thing is to change it to 0xffffffff, let me know and I'll do it in place, instead of resending the whole thing.
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