25 Nov
2017
25 Nov
'17
1:25 a.m.
I am curious about how the Harvard Architecture relates to Unix,
historically. If the Harvard Architecture is predicated on the
separation of code from data in order to prevent self-modifying code (my
interpretation), then it would seem to me to be somewhat at odds with a
Unix philosophy of extreme abstraction (code, data, it's all 0's and
1's, after all). In my naive understanding, the PDP-11 itself, with the
Unibus and apparently agnostic ISA seem to summarily reject the Harvard
Architecure...
My question is - was there tension around Harvard and Von Neumann
architectures in Unix circles and if so, how was it resolved?
Thanks,
Will
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