DragonFly kernel List (threaded) for 2007-10
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Re: pmap of amd64
On Fri, Oct 12, 2007 at 07:54:16PM -0700, Matthew Dillon wrote:
> (1) We can map a page containing the address of the per-cpu globaldata
> structure and use %fs in the trap code:
>
> movq $SOME_FIXED_CONSTANT_ADDRESS,%fs
You don't have to play such games on AMD64 -- the swapgs instruction is
normally used by traps and system calls to load a well-defined address
base for that. Note that gs is expected to be used for, but that is a
minor detail.
Joerg
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