Messages in this thread | | | From | Andrej Presern <> | Subject | Re: Differences between FreeBSD and Linux system call mechanism | Date | Fri, 4 Sep 1998 12:30:18 +0200 |
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On Thu, 03 Sep 1998, Alexander Kjeldaas wrote: >On Thu, Sep 03, 1998 at 02:47:10PM +0100, Alan Cox wrote: >> >> > 1) Linux system calls are done using software interrupt 0x80 on ia32. >> > Does this qualify as a "call-gate based kernel entry"? >> >> No. Call gates are a paticular intel mechanism for jumping between rings >> (priviledge levels). You can see an example of this in the iBCS2 handlers >> since iBCS uses call gates. An int based call is faster, and sysenter >> is potentially faster still but sysenter is only on some later PII chips >> > >Doesn't this mean that it would be a good idea to let the kernel >implement system calls by mapping a page into user-space containing >the appropriate assembly instructions to most efficiently do the >system calls?
Finally some sense.
Andrej
-- Andrej Presern, andrejp@luz.fe.uni-lj.si
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