| Weekly edition | Kernel | Security | Distributions | Search |
| Archives | Calendar | Subscribe | Write for LWN | LWN.net FAQ |
LCA: Andrew Tanenbaum on creating reliable systems
LCA: Andrew Tanenbaum on creating reliable systems
Posted 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.
(Log in to post comments)
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.