Messages in this thread |  | | From | Richard Henderson <> | Subject | Re: Byte article - 64 bit Unix | Date | Sat, 26 Oct 1996 17:17:01 -0500 (CDT) |
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> I think we need to distinguish a few things about 64 bit OS's... > > Does the user address space have 64 bit addressability?
In theory Linux/Alpha could eventually give the user 62 bits of VM address space. The current CPU implementations limit us to 43 bits.
> Do file offsets have 64 bit addressability?
Yes, off_t is 64 bits. None of the underlying filesystems currently support files that big, but the VFS layer does not disallow it.
> Does the CPU do 64 bit arithmetic? > Do memory move and copy routines use 64 bit at a time?
Of course.
r~
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