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// The ASL file for _OSC Method Implementation
//**********************************************************************
//**********************************************************************
//** **
//** (C)Copyright 1985-2009, American Megatrends, Inc. **
//** **
//** All Rights Reserved. **
//** **
//** 5555 Oakbrook Pkwy, Norcross, GA 30093 **
//** **
//** Phone: (770)-246-8600 **
//** **
//**********************************************************************
//**********************************************************************
//-----------------------------------------------------------------------
//;<AMI_PHDR_START>
//;------------------------------------------------------------------------
//;
//; Procedure: _OSC
//; Description: METHOD CALLED ON SYSTEM STARTUP TO NEGOTIATE OS/BIOS
//; SUPPORTED FEATURES
//; Input: Arg0 (Buffer): UUID
//; Arg1 (Integer): Revision ID
//; Arg2 (Integer): Count
//; Arg3 (Buffer): Capabilities Buffer,
//;
//; Output: Returns modified Arg3.
//;
//;-------------------------------------------------------------------------
//;<AMI_PHDR_END>
Method(_OSC,4)
{
Name(SUPP,0) // PCI _OSC Support Field value
Name(CTRL,0) // PCI _OSC Control Field value
// Create DWord-adressable fields from the Capabilities Buffer
CreateDWordField(Arg3,0,CDW1)
CreateDWordField(Arg3,4,CDW2)
CreateDWordField(Arg3,8,CDW3)
// Check for proper UUID
If(LEqual(Arg0,ToUUID("33DB4D5B-1FF7-401C-9657-7441C03DD766")))
{
// Save Capabilities DWord2 & 3
Store(CDW2,SUPP)
Store(CDW3,CTRL)
//Support Bits:
//0 - extended pci config operation region
//1 - ASPM supported
//2 - Clock Power Management Capability supported
//3 - Pci Segment Groups supported
//4 - MSI supported
//Control Bits:
//0 - Pci Express Native Hot Plug control
//1 - SHPC Native Hot Plug control
//2 - Pci Express Native Power Management Events control
//3 - Pci Express Advanced Error Reporting control
//4 - Pci Express Capability Structure control
// Only allow native hot plug control if OS supports:
// * ASPM
// * Clock PM
// * MSI/MSI-X
If(LNotEqual(And(SUPP, 0x16), 0x16))
{
And(CTRL,0x1E, CTRL) // Mask bit 0 (and undefined bits)
}
//Tokens ACPI.sdl
if (LNot(PEHP))//BIOS Supports PCI Express HP?
{
And(CTRL,0x1E,CTRL)
}
if (LNot(SHPC)) //BIOS Supports SHPC Hot Plug ?
{
And(CTRL,0x1D,CTRL)
}
if (LNot(PEPM)) //BIOS Supports PCI Express ASPM?
{
And(CTRL,0x1B,CTRL)
}
if (LNot(PEER)) //BIOS Supports PCI Express Adv Error Reporting?
{
And(CTRL,0x15,CTRL)
}
if (LNot(PECS)) //BIOS Provides PCI Express MCFG Table?
{
And(CTRL,0xF,CTRL)
}
If(LNotEqual(Arg1,One))
{ // Unknown revision
Or(CDW1,0x08,CDW1)
}
If(LNotEqual(CDW3,CTRL))
{ // Certain Capabilities bits were masked
Or(CDW1,0x10,CDW1)
}
// Update DWORD3 in the buffer
Store(CTRL,CDW3)
Return(Arg3)
} Else {
Or(CDW1,4,CDW1) // Unrecognized UUID
Return(Arg3)
}
} // End _OSC
//-----------------------------------------------------------------------
//**********************************************************************
//**********************************************************************
//** **
//** (C)Copyright 1985-2009, American Megatrends, Inc. **
//** **
//** All Rights Reserved. **
//** **
//** 5555 Oakbrook Pkwy, Norcross, GA 30093 **
//** **
//** Phone: (770)-246-8600 **
//** **
//**********************************************************************
//**********************************************************************
|
