where is file entry.S in v2.6.39.4?

I am studying system call in linux with source code in version 2.6.39.4.

Books said that system call is implementd in entry.S, located in arch/i386/kernel/entry.S, but I can't find that file in v2.6.39.4开发者_如何学C.

so which file implement system call in my version? Any difference with old ones?

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The information in your books seems to be outdated.

You should find what you're looking for in arch/x86/kernel/entry_32.S and arch/x86/kernel/entry_64.S.