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Diffstat (limited to 'Core/EM/ACPI/OSCM.asl')
| -rw-r--r-- | Core/EM/ACPI/OSCM.asl | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/Core/EM/ACPI/OSCM.asl b/Core/EM/ACPI/OSCM.asl new file mode 100644 index 0000000..9a3e76f --- /dev/null +++ b/Core/EM/ACPI/OSCM.asl @@ -0,0 +1,124 @@ +// 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 ** +//** ** +//********************************************************************** +//********************************************************************** |