The Intel Restricted Access Region Handler provides a buffer allocation
mechanism to RAR users. Since the intended usage model is to lock out
CPU access to RAR (the CPU will not be able to access RAR memory), this
driver does not access RAR memory, and merely keeps track of what areas
of RAR memory are in use. It has it's own simple allocator that does
not rely on existing kernel allocators (SLAB, etc) since those
allocators are too tightly coupled with the paging mechanism, which isn't
needed for the intended RAR use cases.
An mmap() implementation is provided for debugging purposes to simplify
RAR memory access from the user space. However, it will effectively be
a no-op when RAR access control is enabled since the CPU will not be
able to access RAR.
This driver should not be confused with the rar_register driver. That
driver exposes an interface to access RAR registers on the Moorestown
platform. The RAR handler driver relies on the rar_register driver for
low level RAR register reads and writes.
This patch was generated and built against the latest linux-2.6 master
branch.
Signed-off-by: Ossama Othman <ossama.othman@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Ossama Othman