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Used to provide user-space applications
with direct access to physical addresses.
Usage: open /dev/mem and read or write at given offset.
What you read or write is the value
at the corresponding physical address.
Used by applications such as the X server
to write directly to device memory.
On x86, arm and tile: CONFIG_STRICT_DEVMEM option to restrict /dev/mem non-RAM addresses, for security reasons (2.6.37-rc2 status).