The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)

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FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/powerpc/ibm,vas.txt

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    1 * IBM Powerpc Virtual Accelerator Switchboard (VAS)
    2 
    3 VAS is a hardware mechanism that allows kernel subsystems and user processes
    4 to directly submit compression and other requests to Nest accelerators (NX)
    5 or other coprocessors functions.
    6 
    7 Required properties:
    8 - compatible : should be "ibm,vas".
    9 - ibm,vas-id : A unique identifier for each instance of VAS in the system
   10 - reg : Should contain 4 pairs of 64-bit fields specifying the Hypervisor
   11   window context start and length, OS/User window context start and length,
   12   "Paste address" start and length, "Paste window id" start bit and number
   13   of bits)
   14 
   15 Example:
   16 
   17         vas@6019100000000 {
   18                 compatible = "ibm,vas", "ibm,power9-vas";
   19                 reg = <0x6019100000000 0x2000000 0x6019000000000 0x100000000 0x8000000000000 0x100000000 0x20 0x10>;
   20                 name = "vas";
   21                 ibm,vas-id = <0x1>;
   22         };

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