[RFC,edk2-platforms,v2,0/1] add basic support for CXL on sbsa-ref

Message

Yuquan Wang Nov. 5, 2024, 10:39 a.m. UTC

v1 -> v2:
- PCDs values about CXL exclusive MMIO32 & MMIO64 space
- CXL Bus range: 0xc0 ~ 0xff
- PCIE ecam space & Cxl ecam space
- CEDT format

RFC because
- Many contents are ported from Jonathan' patch on qemu virt design

- Bring plenty of PCDs values and modifying the original PCIE values

- Less experience and not particularly confident in ACPI area

This series leverages Jonathan's patches[1] to add acpi0016 & acpi0017 objects into the
previous DSDT table of sbsa-ref. Since the acpi0016 implementation model on qemu side is
the pxb-cxl, this cxl Bus would share ECAM sapce of PCIE Bus. Thus I divide some space
from Pcie Ecam to support cxl-related values.

To prevent breaking the original pcie mmio space, this adds exclusive mmio32 & mmio64
space for cxl host.

This defines the pcie bus range of cxl host is 0xc0 ~ 0xff, since the pxb-cxl-host as
well as cxl components on it would occupy the original pcie buses, the original pcie
ecam space should divided some range for pxb-cxl-host.

Based on the new CEDT definitions patch on edk2[2], this series adds a static Cedt.aslc to
support the [SBSA_CXL_HOST] & [SBSA_CXL_FIXED_WINDOW] space on sbsa-ref.

DSDT:
Device (CXL0)
        {
            Name (_HID, "ACPI0016" /* Compute Express Link Host Bridge */)  // _HID: Hardware ID
            Name (_CID, Package (0x02)  // _CID: Compatible ID
            {
                EisaId ("PNP0A08") /* PCI Express Bus */, 
                EisaId ("PNP0A03") /* PCI Bus */
            })
            Name (_BBN, 0xC0)  // _BBN: BIOS Bus Number
            Name (_UID, One)  // _UID: Unique ID
            Name (_STR, Unicode ("pxb Device"))  // _STR: Description String
            Name (_CCA, One)  // _CCA: Cache Coherency Attribute
            Name (_PRT, Package (0x80)  // _PRT: PCI Routing Table
            {
                Package (0x04)
                {
                    0xFFFF, 
                    Zero, 
                    GSI0, 
                    Zero
                }, 

                Package (0x04)
                {
                    0xFFFF, 
                    One, 
                    GSI1, 
                    Zero
                }, 

                Package (0x04)
                {
                    0xFFFF, 
                    0x02, 
                    GSI2, 
                    Zero
                }, 

                Package (0x04)
                {
                    0xFFFF, 
                    0x03, 
                    GSI3, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0001FFFF, 
                    Zero, 
                    GSI1, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0001FFFF, 
                    One, 
                    GSI2, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0001FFFF, 
                    0x02, 
                    GSI3, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0001FFFF, 
                    0x03, 
                    GSI0, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0002FFFF, 
                    Zero, 
                    GSI2, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0002FFFF, 
                    One, 
                    GSI3, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0002FFFF, 
                    0x02, 
                    GSI0, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0002FFFF, 
                    0x03, 
                    GSI1, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0003FFFF, 
                    Zero, 
                    GSI3, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0003FFFF, 
                    One, 
                    GSI0, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0003FFFF, 
                    0x02, 
                    GSI1, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0003FFFF, 
                    0x03, 
                    GSI2, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0004FFFF, 
                    Zero, 
                    GSI0, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0004FFFF, 
                    One, 
                    GSI1, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0004FFFF, 
                    0x02, 
                    GSI2, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0004FFFF, 
                    0x03, 
                    GSI3, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0005FFFF, 
                    Zero, 
                    GSI1, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0005FFFF, 
                    One, 
                    GSI2, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0005FFFF, 
                    0x02, 
                    GSI3, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0005FFFF, 
                    0x03, 
                    GSI0, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0006FFFF, 
                    Zero, 
                    GSI2, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0006FFFF, 
                    One, 
                    GSI3, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0006FFFF, 
                    0x02, 
                    GSI0, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0006FFFF, 
                    0x03, 
                    GSI1, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0007FFFF, 
                    Zero, 
                    GSI3, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0007FFFF, 
                    One, 
                    GSI0, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0007FFFF, 
                    0x02, 
                    GSI1, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0007FFFF, 
                    0x03, 
                    GSI2, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0008FFFF, 
                    Zero, 
                    GSI0, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0008FFFF, 
                    One, 
                    GSI1, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0008FFFF, 
                    0x02, 
                    GSI2, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0008FFFF, 
                    0x03, 
                    GSI3, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0009FFFF, 
                    Zero, 
                    GSI1, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0009FFFF, 
                    One, 
                    GSI2, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0009FFFF, 
                    0x02, 
                    GSI3, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0009FFFF, 
                    0x03, 
                    GSI0, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x000AFFFF, 
                    Zero, 
                    GSI2, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x000AFFFF, 
                    One, 
                    GSI3, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x000AFFFF, 
                    0x02, 
                    GSI0, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x000AFFFF, 
                    0x03, 
                    GSI1, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x000BFFFF, 
                    Zero, 
                    GSI3, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x000BFFFF, 
                    One, 
                    GSI0, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x000BFFFF, 
                    0x02, 
                    GSI1, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x000BFFFF, 
                    0x03, 
                    GSI2, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x000CFFFF, 
                    Zero, 
                    GSI0, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x000CFFFF, 
                    One, 
                    GSI1, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x000CFFFF, 
                    0x02, 
                    GSI2, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x000CFFFF, 
                    0x03, 
                    GSI3, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x000DFFFF, 
                    Zero, 
                    GSI1, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x000DFFFF, 
                    One, 
                    GSI2, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x000DFFFF, 
                    0x02, 
                    GSI3, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x000DFFFF, 
                    0x03, 
                    GSI0, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x000EFFFF, 
                    Zero, 
                    GSI2, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x000EFFFF, 
                    One, 
                    GSI3, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x000EFFFF, 
                    0x02, 
                    GSI0, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x000EFFFF, 
                    0x03, 
                    GSI1, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x000FFFFF, 
                    Zero, 
                    GSI3, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x000FFFFF, 
                    One, 
                    GSI0, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x000FFFFF, 
                    0x02, 
                    GSI1, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x000FFFFF, 
                    0x03, 
                    GSI2, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0010FFFF, 
                    Zero, 
                    GSI0, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0010FFFF, 
                    One, 
                    GSI1, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0010FFFF, 
                    0x02, 
                    GSI2, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0010FFFF, 
                    0x03, 
                    GSI3, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0011FFFF, 
                    Zero, 
                    GSI1, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0011FFFF, 
                    One, 
                    GSI2, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0011FFFF, 
                    0x02, 
                    GSI3, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0011FFFF, 
                    0x03, 
                    GSI0, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0012FFFF, 
                    Zero, 
                    GSI2, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0012FFFF, 
                    One, 
                    GSI3, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0012FFFF, 
                    0x02, 
                    GSI0, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0012FFFF, 
                    0x03, 
                    GSI1, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0013FFFF, 
                    Zero, 
                    GSI3, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0013FFFF, 
                    One, 
                    GSI0, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0013FFFF, 
                    0x02, 
                    GSI1, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0013FFFF, 
                    0x03, 
                    GSI2, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0014FFFF, 
                    Zero, 
                    GSI0, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0014FFFF, 
                    One, 
                    GSI1, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0014FFFF, 
                    0x02, 
                    GSI2, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0014FFFF, 
                    0x03, 
                    GSI3, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0015FFFF, 
                    Zero, 
                    GSI1, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0015FFFF, 
                    One, 
                    GSI2, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0015FFFF, 
                    0x02, 
                    GSI3, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0015FFFF, 
                    0x03, 
                    GSI0, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0016FFFF, 
                    Zero, 
                    GSI2, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0016FFFF, 
                    One, 
                    GSI3, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0016FFFF, 
                    0x02, 
                    GSI0, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0016FFFF, 
                    0x03, 
                    GSI1, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0017FFFF, 
                    Zero, 
                    GSI3, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0017FFFF, 
                    One, 
                    GSI0, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0017FFFF, 
                    0x02, 
                    GSI1, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0017FFFF, 
                    0x03, 
                    GSI2, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0018FFFF, 
                    Zero, 
                    GSI0, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0018FFFF, 
                    One, 
                    GSI1, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0018FFFF, 
                    0x02, 
                    GSI2, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0018FFFF, 
                    0x03, 
                    GSI3, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0019FFFF, 
                    Zero, 
                    GSI1, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0019FFFF, 
                    One, 
                    GSI2, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0019FFFF, 
                    0x02, 
                    GSI3, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x0019FFFF, 
                    0x03, 
                    GSI0, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x001AFFFF, 
                    Zero, 
                    GSI2, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x001AFFFF, 
                    One, 
                    GSI3, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x001AFFFF, 
                    0x02, 
                    GSI0, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x001AFFFF, 
                    0x03, 
                    GSI1, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x001BFFFF, 
                    Zero, 
                    GSI3, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x001BFFFF, 
                    One, 
                    GSI0, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x001BFFFF, 
                    0x02, 
                    GSI1, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x001BFFFF, 
                    0x03, 
                    GSI2, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x001CFFFF, 
                    Zero, 
                    GSI0, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x001CFFFF, 
                    One, 
                    GSI1, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x001CFFFF, 
                    0x02, 
                    GSI2, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x001CFFFF, 
                    0x03, 
                    GSI3, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x001DFFFF, 
                    Zero, 
                    GSI1, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x001DFFFF, 
                    One, 
                    GSI2, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x001DFFFF, 
                    0x02, 
                    GSI3, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x001DFFFF, 
                    0x03, 
                    GSI0, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x001EFFFF, 
                    Zero, 
                    GSI2, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x001EFFFF, 
                    One, 
                    GSI3, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x001EFFFF, 
                    0x02, 
                    GSI0, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x001EFFFF, 
                    0x03, 
                    GSI1, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x001FFFFF, 
                    Zero, 
                    GSI3, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x001FFFFF, 
                    One, 
                    GSI0, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x001FFFFF, 
                    0x02, 
                    GSI1, 
                    Zero
                }, 

                Package (0x04)
                {
                    0x001FFFFF, 
                    0x03, 
                    GSI2, 
                    Zero
                }
            })
            Device (GSI0)
            {
                Name (_HID, "PNP0C0F" /* PCI Interrupt Link Device */)  // _HID: Hardware ID
                Name (_UID, Zero)  // _UID: Unique ID
                Name (_PRS, ResourceTemplate ()  // _PRS: Possible Resource Settings
                {
                    Interrupt (ResourceConsumer, Level, ActiveHigh, Exclusive, ,, )
                    {
                        0x00000023,
                    }
                })
                Name (_CRS, ResourceTemplate ()  // _CRS: Current Resource Settings
                {
                    Interrupt (ResourceConsumer, Level, ActiveHigh, Exclusive, ,, )
                    {
                        0x00000023,
                    }
                })
                Method (_SRS, 1, NotSerialized)  // _SRS: Set Resource Settings
                {
                }
            }

            Device (GSI1)
            {
                Name (_HID, "PNP0C0F" /* PCI Interrupt Link Device */)  // _HID: Hardware ID
                Name (_UID, One)  // _UID: Unique ID
                Name (_PRS, ResourceTemplate ()  // _PRS: Possible Resource Settings
                {
                    Interrupt (ResourceConsumer, Level, ActiveHigh, Exclusive, ,, )
                    {
                        0x00000024,
                    }
                })
                Name (_CRS, ResourceTemplate ()  // _CRS: Current Resource Settings
                {
                    Interrupt (ResourceConsumer, Level, ActiveHigh, Exclusive, ,, )
                    {
                        0x00000024,
                    }
                })
                Method (_SRS, 1, NotSerialized)  // _SRS: Set Resource Settings
                {
                }
            }

            Device (GSI2)
            {
                Name (_HID, "PNP0C0F" /* PCI Interrupt Link Device */)  // _HID: Hardware ID
                Name (_UID, 0x02)  // _UID: Unique ID
                Name (_PRS, ResourceTemplate ()  // _PRS: Possible Resource Settings
                {
                    Interrupt (ResourceConsumer, Level, ActiveHigh, Exclusive, ,, )
                    {
                        0x00000025,
                    }
                })
                Name (_CRS, ResourceTemplate ()  // _CRS: Current Resource Settings
                {
                    Interrupt (ResourceConsumer, Level, ActiveHigh, Exclusive, ,, )
                    {
                        0x00000025,
                    }
                })
                Method (_SRS, 1, NotSerialized)  // _SRS: Set Resource Settings
                {
                }
            }

            Device (GSI3)
            {
                Name (_HID, "PNP0C0F" /* PCI Interrupt Link Device */)  // _HID: Hardware ID
                Name (_UID, 0x03)  // _UID: Unique ID
                Name (_PRS, ResourceTemplate ()  // _PRS: Possible Resource Settings
                {
                    Interrupt (ResourceConsumer, Level, ActiveHigh, Exclusive, ,, )
                    {
                        0x00000026,
                    }
                })
                Name (_CRS, ResourceTemplate ()  // _CRS: Current Resource Settings
                {
                    Interrupt (ResourceConsumer, Level, ActiveHigh, Exclusive, ,, )
                    {
                        0x00000026,
                    }
                })
                Method (_SRS, 1, NotSerialized)  // _SRS: Set Resource Settings
                {
                }
            }

            Name (_CRS, ResourceTemplate ()  // _CRS: Current Resource Settings
            {
                DWordMemory (ResourceProducer, PosDecode, MinFixed, MaxFixed, Cacheable, ReadWrite,
                    0x00000000,         // Granularity
                    0x60130000,         // Range Minimum
                    0x6212FFFF,         // Range Maximum
                    0x00000000,         // Translation Offset
                    0x02000000,         // Length
                    ,, , AddressRangeMemory, TypeStatic)
                QWordMemory (ResourceProducer, PosDecode, MinFixed, MaxFixed, Cacheable, ReadWrite,
                    0x0000000000000000, // Granularity
                    0x0000090000000000, // Range Minimum
                    0x00000900000FFFFF, // Range Maximum
                    0x0000000000000000, // Translation Offset
                    0x0000000000100000, // Length
                    ,, , AddressRangeMemory, TypeStatic)
                WordBusNumber (ResourceProducer, MinFixed, MaxFixed, PosDecode,
                    0x0000,             // Granularity
                    0x00C0,             // Range Minimum
                    0x00FF,             // Range Maximum
                    0x0000,             // Translation Offset
                    0x0040,             // Length
                    ,, )
            })
            Device (RES0)
            {
                Name (_HID, "PNP0C02" /* PNP Motherboard Resources */)  // _HID: Hardware ID
                Name (_CRS, ResourceTemplate ()  // _CRS: Current Resource Settings
                {
                    QWordMemory (ResourceProducer, PosDecode, MinFixed, MaxFixed, NonCacheable, ReadWrite,
                        0x0000000000000000, // Granularity
                        0x00000000FC000000, // Range Minimum
                        0x00000000FFFFFFFF, // Range Maximum
                        0x0000000000000000, // Translation Offset
                        0x0000000004000000, // Length
                        ,, , AddressRangeMemory, TypeStatic)
                })
                Method (_STA, 0, NotSerialized)  // _STA: Status
                {
                    Return (0x0F)
                }
            }

            Name (SUPP, Zero)
            Name (CTRL, Zero)
            Name (SUPC, Zero)
            Name (CTRC, Zero)
            Method (_OSC, 4, NotSerialized)  // _OSC: Operating System Capabilities
            {
                CreateDWordField (Arg3, Zero, CDW1)
                If (((Arg0 == ToUUID ("33db4d5b-1ff7-401c-9657-7441c03dd766") /* PCI Host Bridge Device */) || (Arg0 == ToUUID ("68f2d50b-c469-4d8a-bd3d-941a103fd3fc") /* Unknown UUID */)))
                {
                    CreateDWordField (Arg3, 0x04, CDW2)
                    CreateDWordField (Arg3, 0x08, CDW3)
                    Local0 = CDW3 /* \_SB_.CXL0._OSC.CDW3 */
                    Local0 &= 0x1F
                    If ((Arg1 != One))
                    {
                        CDW1 |= 0x08
                    }

                    If ((CDW3 != Local0))
                    {
                        CDW1 |= 0x10
                    }

                    SUPP = CDW2 /* \_SB_.CXL0._OSC.CDW2 */
                    CTRL = CDW3 /* \_SB_.CXL0._OSC.CDW3 */
                    CDW3 = Local0
                    If ((Arg0 == ToUUID ("68f2d50b-c469-4d8a-bd3d-941a103fd3fc") /* Unknown UUID */))
                    {
                        CreateDWordField (Arg3, 0x0C, CDW4)
                        CreateDWordField (Arg3, 0x10, CDW5)
                        SUPC = CDW4 /* \_SB_.CXL0._OSC.CDW4 */
                        CTRC = CDW5 /* \_SB_.CXL0._OSC.CDW5 */
                        CDW5 |= One
                    }

                    Return (Arg3)
                }
                Else
                {
                    CDW1 |= 0x04
                    Return (Arg3)
                }
            }
        }

CEDT:
[000h 0000 004h]                   Signature : "CEDT"    [CXL Early Discovery Table]
[004h 0004 004h]                Table Length : 000000A8
[008h 0008 001h]                    Revision : 01
[009h 0009 001h]                    Checksum : 50
[00Ah 0010 006h]                      Oem ID : "LINARO"
[010h 0016 008h]                Oem Table ID : "SBSAQEMU"
[018h 0024 004h]                Oem Revision : 20240625
[01Ch 0028 004h]             Asl Compiler ID : "LNRO"
[020h 0032 004h]       Asl Compiler Revision : 00000001


[024h 0036 001h]               Subtable Type : 00 [CXL Host Bridge Structure]
[025h 0037 001h]                    Reserved : 00
[026h 0038 002h]                      Length : 0020
[028h 0040 004h]      Associated host bridge : 00000001
[02Ch 0044 004h]       Specification version : 00000001
[030h 0048 004h]                    Reserved : 00000000
[034h 0052 008h]               Register base : 0000000060120000
[03Ch 0060 008h]             Register length : 0000000000010000

[044h 0068 001h]               Subtable Type : 01 [CXL Fixed Memory Window Structure]
[045h 0069 001h]                    Reserved : 00
[046h 0070 002h]                      Length : 0064
[048h 0072 004h]                    Reserved : 00000000
[04Ch 0076 008h]         Window base address : 00000A0000000000
[054h 0084 008h]                 Window size : 0000010000000000
[05Ch 0092 001h]          Interleave Members : 00
[05Dh 0093 001h]       Interleave Arithmetic : 00
[05Eh 0094 002h]                    Reserved : 0000
[060h 0096 004h]                 Granularity : 00000000
[064h 0100 002h]                Restrictions : 000F
[066h 0102 002h]                       QtgId : 0001
[068h 0104 004h]                First Target : 00000001

Link:
[1]: https://lore.kernel.org/linux-cxl/[e-mail]/
[2]: https://edk2.groups.io/g/devel/topic/rfc_edk2_patch_v3_0_1/109403423#

Yuquan Wang (1):
  SbsaQemu: Support basic CXL enablement

 Platform/Qemu/SbsaQemu/SbsaQemu.dsc           |  23 +-
 .../Qemu/SbsaQemu/AcpiTables/AcpiTables.inf   |  19 +
 Silicon/Qemu/SbsaQemu/AcpiTables/Cedt.aslc    |  69 +++
 Silicon/Qemu/SbsaQemu/AcpiTables/Dsdt.asl     | 401 +++++++++++++++++-
 Silicon/Qemu/SbsaQemu/AcpiTables/Mcfg.aslc    |   2 +-
 Silicon/Qemu/SbsaQemu/SbsaQemu.dec            |  34 +-
 6 files changed, 537 insertions(+), 11 deletions(-)
 create mode 100644 Silicon/Qemu/SbsaQemu/AcpiTables/Cedt.aslc