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Re: [RFC] [PATCH] 32-bit pointers in x86-64
>You can't use conventional 32-bit x86 code, so there seems little or no
>benefit in allowing 32 and 64-bit code to be mixed.
Why not? Switching between 32- and 64-bit modes doesn't involve anything
(apart from knowing the proper selector register values) that cannot be done
purely in user mode. Specifically, I once successfully tried executing 64-bit
code in a 32-bit process.