why no vsyscall support on x86 or i386 ?

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Hi,

Why there is no vsyscall support on i386? I see it only on x86_64. In 
x86_64 it supports gettimeofday, etc.
In i386, it only uses to support the sysenter optimization.
Why there is no support for gettimeofday in i386 as a vsyscall?

-Fredrick


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