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     glxsb — Geode LX Security Block crypto accelerator


     To compile this driver into the kernel, place the following lines in your kernel
     configuration file:

           device crypto
           device glxsb

     Alternatively, to load the driver as a module at boot time, place the following line in



     The glxsb driver supports the security block of the Geode LX series processors.  The Geode
     LX is a member of the AMD Geode family of integrated x86 system chips.

     Driven by periodic checks for available data from the generator, glxsb supplies entropy to
     the random(4) driver for common usage.

     glxsb also supports acceleration of AES-128-CBC operations for crypto(4).  It also registers
     itself to accelerate other HMAC algorithms, although there is no hardware acceleration for
     those algorithms.  This is only needed so glxsb can work with ipsec(4).


     The crypto(9) framework will fail to open the crypto session on the device if the AES key's
     length is != 128 bits.  This prevents the use of the glxsb device driver with AES keys of
     length != 128 bits.


     crypto(4), intro(4), ipsec(4), pci(4), random(4), crypto(9)


     The glxsb device driver first appeared in OpenBSD 4.1.  The glxsb device driver was imported
     into FreeBSD 7.1.


     The glxsb device driver was written for OpenBSD by Tom Cosgrove.  It was ported to FreeBSD
     by Patrick Lamaiziere <>.