1*4dea2d1aSSukadev Bhattiprolu* IBM Powerpc Virtual Accelerator Switchboard (VAS) 2*4dea2d1aSSukadev Bhattiprolu 3*4dea2d1aSSukadev BhattiproluVAS is a hardware mechanism that allows kernel subsystems and user processes 4*4dea2d1aSSukadev Bhattiproluto directly submit compression and other requests to Nest accelerators (NX) 5*4dea2d1aSSukadev Bhattiproluor other coprocessors functions. 6*4dea2d1aSSukadev Bhattiprolu 7*4dea2d1aSSukadev BhattiproluRequired properties: 8*4dea2d1aSSukadev Bhattiprolu- compatible : should be "ibm,vas". 9*4dea2d1aSSukadev Bhattiprolu- ibm,vas-id : A unique identifier for each instance of VAS in the system 10*4dea2d1aSSukadev Bhattiprolu- reg : Should contain 4 pairs of 64-bit fields specifying the Hypervisor 11*4dea2d1aSSukadev Bhattiprolu window context start and length, OS/User window context start and length, 12*4dea2d1aSSukadev Bhattiprolu "Paste address" start and length, "Paste window id" start bit and number 13*4dea2d1aSSukadev Bhattiprolu of bits) 14*4dea2d1aSSukadev Bhattiprolu 15*4dea2d1aSSukadev BhattiproluExample: 16*4dea2d1aSSukadev Bhattiprolu 17*4dea2d1aSSukadev Bhattiprolu vas@6019100000000 { 18*4dea2d1aSSukadev Bhattiprolu compatible = "ibm,vas", "ibm,power9-vas"; 19*4dea2d1aSSukadev Bhattiprolu reg = <0x6019100000000 0x2000000 0x6019000000000 0x100000000 0x8000000000000 0x100000000 0x20 0x10>; 20*4dea2d1aSSukadev Bhattiprolu name = "vas"; 21*4dea2d1aSSukadev Bhattiprolu ibm,vas-id = <0x1>; 22*4dea2d1aSSukadev Bhattiprolu }; 23