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LCA: Andrew Tanenbaum on creating reliable systemsLCA: Andrew Tanenbaum on creating reliable systemsPosted Jan 24, 2007 14:01 UTC (Wed) by kleptog (subscriber, #1183)In reply to: LCA: Andrew Tanenbaum on creating reliable systems by nix Parent article: LCA: Andrew Tanenbaum on creating reliable systems
On i386 hardware, it's possible to grant an unprivelidged processes access to particular I/O ports, without having to do any ring transitions. On Linux it's the ioperm() function call.
These days people use memory-mapped I/O so mmap() is what you mostly need.
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LCA: Andrew Tanenbaum on creating reliable systems Posted Feb 2, 2007 13:46 UTC (Fri) by willy (subscriber, #9762) [Link] Yes, but minix explicitly doesn't do ioperm, it really does call down to the microkernel to do IO port accesses. He talked about how 'evil' mmaped IO was.
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