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/*++
Copyright (c) 1999 - 2014, Intel Corporation. All rights reserved
SPDX-License-Identifier: BSD-2-Clause-Patent
Module Name:
IgdOSBCB.ASL
Abstract:
IGD OpRegion/Software SCI Reference Code for the Baytrail Family.
This file contains the system BIOS call back functionality for the
OpRegion/Software SCI mechanism.
--*/
Method (SBCB, 0, Serialized)
{
// Supported Callbacks: Sub-function 0
If (LEqual(GESF, 0x0))
{
//<TODO> An OEM may support the driver->SBIOS status callbacks, but
// the supported callbacks value must be modified. The code that is
// executed upon reception of the callbacks must be also be updated
// to perform the desired functionality.
Store(0x00000000, PARM) // No callbacks supported
If(LEqual(PFLV,FMBL))
{
Store(0x000F87FD, PARM) // Mobile
}
If(LEqual(PFLV,FDTP))
{
Store(0x000F87BD, PARM) // Desktop
}
Store(Zero, GESF) // Clear the exit parameter
Return(SUCC) // "Success"
}
// BIOS POST Completion: Sub-function 1
If (LEqual(GESF, 1))
{
Store(Zero, GESF) // Clear the exit parameter
Store(Zero, PARM)
Return(SUCC) // Not supported, but no failure
}
// Pre-Hires Set Mode: Sub-function 3
If (LEqual(GESF, 3))
{
Store(Zero, GESF) // Clear the exit parameter
Store(Zero, PARM)
Return(SUCC) // Not supported, but no failure
}
// Post-Hires Set Mode: Sub-function 4
If (LEqual(GESF, 4))
{
Store(Zero, GESF) // Clear the exit parameter
Store(Zero, PARM)
Return(SUCC) // Not supported, but no failure
}
// Display Switch: Sub-function 5
If (LEqual(GESF, 5))
{
Store(Zero, GESF) // Clear the exit parameter
Store(Zero, PARM)
Return(SUCC) // Not supported, but no failure
}
// Set TV format: Sub-function 6
If (LEqual(GESF, 6))
{
//<TODO> If implemented, the input values must be saved into
// non-volatile storage for parsing during the next boot. The
// following Sample code is Intel validated implementation.
Store(And(PARM, 0x0F), ITVF)
Store(ShiftRight(And(PARM, 0xF0), 4), ITVM)
Store(Zero, GESF) // Clear the exit parameter
Store(Zero, PARM)
Return(SUCC)
}
// Adapter Power State: Sub-function 7
If (LEqual(GESF, 7))
{
// Upon notification from driver that the Adapter Power State = D0,
// check if previous lid event failed. If it did, retry the lid
// event here.
If(LEqual(PARM, 0))
{
Store(CLID, Local0)
If(And(0x80000000,Local0))
{
And(CLID, 0x0000000F, CLID)
GLID(CLID)
}
}
Store(Zero, GESF) // Clear the exit parameter
Store(Zero, PARM)
Return(SUCC) // Not supported, but no failure
}
// Display Power State: Sub-function 8
If (LEqual(GESF, 8))
{
Store(Zero, GESF) // Clear the exit parameter
Store(Zero, PARM)
Return(SUCC) // Not supported, but no failure
}
// Set Boot Display: Sub-function 9
If (LEqual(GESF, 9))
{
//<TODO> An OEM may elect to implement this method. In that case,
// the input values must be saved into non-volatile storage for
// parsing during the next boot. The following Sample code is Intel
// validated implementation.
And(PARM, 0xFF, IBTT) // Save the boot display to NVS
Store(Zero, GESF) // Clear the exit parameter
Store(Zero, PARM)
Return(SUCC) // Reserved, "Critical failure"
}
// Set Panel Details: Sub-function 10 (0Ah)
If (LEqual(GESF, 10))
{
//<TODO> An OEM may elect to implement this method. In that case,
// the input values must be saved into non-volatile storage for
// parsing during the next boot. The following Sample code is Intel
// validated implementation.
// Set the panel-related NVRAM variables based the input from the driver.
And(PARM, 0xFF, IPSC)
// Change panel type if a change is requested by the driver (Change if
// panel type input is non-zero). Zero=No change requested.
If(And(ShiftRight(PARM, 8), 0xFF))
{
And(ShiftRight(PARM, 8), 0xFF, IPAT)
Decrement(IPAT) // 0 = no change, so fit to CMOS map
}
And(ShiftRight(PARM, 18), 0x3, IBLC)
And(ShiftRight(PARM, 20), 0x7, IBIA)
Store(Zero, GESF) // Clear the exit parameter
Store(Zero, PARM)
Return(SUCC) // Success
}
// Set Internal Graphics: Sub-function 11 (0Bh)
If (LEqual(GESF, 11))
{
//<TODO> An OEM may elect to implement this method. In that case,
// the input values must be saved into non-volatile storage for
// parsing during the next boot. The following Sample code is Intel
// validated implementation.
And(ShiftRight(PARM, 1), 1, IF1E) // Program the function 1 option
// Fixed memory/DVMT memory
And(ShiftRight(PARM, 17), 0xF, IDMS) // Program DVMT/fixed memory size
Store(Zero, GESF) // Clear the exit parameter
Store(Zero, PARM)
Return(SUCC) // Success
}
// Post-Hires to DOS FS: Sub-function 16 (10h)
If (LEqual(GESF, 16))
{
Store(Zero, GESF) // Clear the exit parameter
Store(Zero, PARM)
Return(SUCC) // Not supported, but no failure
}
// APM Complete: Sub-function 17 (11h)
If (LEqual(GESF, 17))
{
Store(ShiftLeft(LIDS, 8), PARM) // Report the lid state
Add(PARM, 0x100, PARM) // Adjust the lid state, 0 = Unknown
Store(Zero, GESF) // Clear the exit parameter
Return(SUCC) // Not supported, but no failure
}
// Set Spread Spectrum Clocks: Sub-function 18 (12h)
If (LEqual(GESF, 18))
{
//<TODO> An OEM may elect to implement this method. In that case,
// the input values must be saved into non-volatile storage for
// parsing during the next boot. The following Sample code is Intel
// validated implementation.
If(And(PARM, 1))
{
If(LEqual(ShiftRight(PARM, 1), 1))
{
Store(1, ISSC) // Enable HW SSC, only for clock 1
}
Else
{
Store(Zero, GESF)
Return(CRIT) // Failure, as the SSC clock must be 1
}
}
Else
{
Store(0, ISSC) // Disable SSC
}
Store(Zero, GESF) // Clear the exit parameter
Store(Zero, PARM)
Return(SUCC) // Success
}
// Post VBE/PM Callback: Sub-function 19 (13h)
If (LEqual(GESF, 19))
{
Store(Zero, GESF) // Clear the exit parameter
Store(Zero, PARM)
Return(SUCC) // Not supported, but no failure
}
// Set PAVP Data: Sub-function 20 (14h)
If (LEqual(GESF, 20))
{
And(PARM, 0xF, PAVP) // Store PAVP info
Store(Zero, GESF) // Clear the exit parameter
Store(Zero, PARM)
Return(SUCC) // Success
}
// A call to a reserved "System BIOS callbacks" function was received
Store(Zero, GESF) // Clear the exit parameter
Return(SUCC) // Reserved, "Critical failure"
}
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