audk/Vlv2DeviceRefCodePkg/AcpiTablesPCAT/IgdOGBDA.ASL

/*++

Copyright (c)  1999  - 2014, Intel Corporation. All rights reserved

  SPDX-License-Identifier: BSD-2-Clause-Patent



Module Name:

  IgdOGBDA.ASL

Abstract:

  IGD OpRegion/Software SCI Reference Code for the Baytrail Family.
  This file contains Get BIOS Data Area funciton support for
  the Integrated Graphics Device (IGD) OpRegion/Software SCI mechanism.

--*/


Method (GBDA, 0, Serialized)
{

  // Supported calls: Sub-function 0

  If (LEqual(GESF, 0))
  {
    //<TODO> Update implementation specific supported calls.  Reference
    // code is set to Intel's validated implementation.

    Store(0x0000279, PARM)

    Store(Zero, GESF)               // Clear the exit parameter
    Return(SUCC)                    // Success
  }

  // Requested callbacks: Sub-function 1

  If (LEqual(GESF, 1))
  {

    //<TODO> Update implementation specific system BIOS requested call
    // back functions.  Call back functions are where the driver calls the
    // system BIOS at function indicated event.

    Store(0x00000240, PARM)

    Store(Zero, GESF)               // Clear the exit parameter
    Return(SUCC)                    // Success
  }

  // Get Boot display Preferences: Sub-function 4

  If (LEqual(GESF, 4))
  {

    //<TODO> Update the implementation specific Get Boot Display
    // Preferences function.

    And(PARM, 0xEFFF0000, PARM)     // PARM[30:16] = Boot device ports
    And(PARM, ShiftLeft(DeRefOf(Index(DBTB, IBTT)), 16), PARM)
    Or(IBTT, PARM, PARM)            // PARM[7:0] = Boot device type

    Store(Zero, GESF)               // Clear the exit parameter
    Return(SUCC)                    // Success
  }

  // Panel details: Sub-function 5

  If (LEqual(GESF, 5))
  {

    //<TODO> Update the implementation specific Get Panel Details
    // function.

    Store(IPSC, PARM)               // Report the scaling setting
    Or(PARM, ShiftLeft(IPAT, 8), PARM)
    Add(PARM, 0x100, PARM)          // Adjust panel type, 0 = VBT default
    Or(PARM, ShiftLeft(LIDS, 16), PARM) // Report the lid state
    Add(PARM, 0x10000, PARM)        // Adjust the lid state, 0 = Unknown
    Or(PARM, ShiftLeft(IBLC, 18), PARM) // Report the BLC setting
    Or(PARM, ShiftLeft(IBIA, 20), PARM) // Report the BIA setting
    Store(Zero, GESF)
    Return(SUCC)
  }

  // TV-standard/Video-connector: Sub-function 6

  If (LEqual(GESF, 6))
  {

    //<TODO> Update the implementation specific Get
    // TV-standard/Video-connectorPanel function.

    Store(ITVF, PARM)
    Or(PARM, ShiftLeft(ITVM, 4), PARM)
    Store(Zero, GESF)
    Return(SUCC)
  }

  // Internal graphics: Sub-function 7

  If (LEqual(GESF, 7))
  {
    Store(GIVD, PARM)               // PARM[0]      - VGA mode(1=VGA)
    Xor(PARM, 1, PARM)              // Invert the VGA mode polarity
    Or(PARM, ShiftLeft(GMFN, 1), PARM) // PARM[1]   - # IGD PCI functions-1
    // PARM[3:2]    - Reserved
    // PARM[4]      - IGD D3 support(0=cold)
    // PARM[10:5]   - Reserved
    Or(PARM, ShiftLeft(3, 11), PARM) // PARM[12:11] - DVMT mode(11b = 5.0)

    //
    // Report DVMT 5.0 Total Graphics memory size.
    //
    Or(PARM, ShiftLeft(IDMS, 17), PARM)   // Bits 20:17 are for Gfx total memory size

    // If the "Set Internal Graphics" call is supported, the modified
    // settings flag must be programmed per the specification.  This means
    // that the flag must be set to indicate that system BIOS requests
    // these settings.  Once "Set Internal Graphics" is called, the
    //  modified settings flag must be cleared on all subsequent calls to
    // this function.

    // Report the graphics frequency based on DISPLAY_CLOCK_FREQUENCY_ENCODING [MMADR+0x20C8]

    Or(ShiftLeft(Derefof(Index(CDCT, \_SB.PCI0.GFX0.MCHK.DCFE)), 21),PARM, PARM)

    Store(1, GESF)                  // Set the modified settings flag
    Return(SUCC)
  }

  // Spread spectrum clocks: Sub-function 10

  If (LEqual(GESF, 10))
  {

    Store(0, PARM)                  // Assume SSC is disabled

    If(ISSC)
    {
      Or(PARM, 3, PARM)       // If SSC enabled, return SSC1+Enabled
    }

    Store(0, GESF)                  // Set the modified settings flag
    Return(SUCC)                    // Success
  }


  // A call to a reserved "Get BIOS data" function was received.

  Store(Zero, GESF)                     // Clear the exit parameter
  Return(CRIT)                          // Reserved, "Critical failure"
}