Unpopular opinion: Tanenbaum was right about Linux.
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As long as the core has the full resource and privilege model, you can put the rest in userspace, yes. But "the rest" is mostly already in userspace; what isn't mostly can't be userspace *libraries* because of how resource & privilege models work.
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The question that I have is will the QNX kernel model make it out of QNX. Because it’s a beautiful model.
End of conversation
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You missed the main point about "all hardware access isolated to unprivileged services". Total opposite of Linux model where all drivers run in kernel memory space, ring 0.
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