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nommu: add support for Memory Protection Units (MPU)
Some architectures (like the Blackfin arch) implement some of the "simpler" features that one would expect out of a MMU such as memory protection. In our case, we actually get read/write/exec protection down to the page boundary so processes can't stomp on each other let alone the kernel. There is a performance decrease (which depends greatly on the workload) however as the hardware/software interaction was not optimized at design time. Signed-off-by: Bernd Schmidt <[email protected]> Signed-off-by: Bryan Wu <[email protected]> Signed-off-by: Mike Frysinger <[email protected]> Acked-by: David Howells <[email protected]> Acked-by: Greg Ungerer <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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