Re: [Qemu-devel] [PATCH 09/11] ACPI: move PRST OperationRegion into SSDT

["Michael S. Tsirkin" <mst@redhat.com>]

On Fri, Dec 13, 2013 at 05:22:14PM +0100, Igor Mammedov wrote:
> .. and report range used by it to OSPM via _CRS.
> PRST is needed in SSDT since its base will depend on
> chipset and will be dynamically set by QEMU.
> Also move PRSC() method along with PRST since cross
> table reference to PRST doesn't work.

Could you clarify this last sentence?
I don't mind where it is but I'd like to know
where does the limitation come from.

> 
> Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> ---
>  hw/i386/acpi-dsdt-cpu-hotplug.dsl | 39 +----------------------
>  hw/i386/acpi-dsdt.dsl             |  2 +-
>  hw/i386/q35-acpi-dsdt.dsl         |  2 +-
>  hw/i386/ssdt-misc.dsl             | 65 +++++++++++++++++++++++++++++++++++++++
>  4 files changed, 68 insertions(+), 40 deletions(-)
> 
> diff --git a/hw/i386/acpi-dsdt-cpu-hotplug.dsl b/hw/i386/acpi-dsdt-cpu-hotplug.dsl
> index 995b415..f26f81b 100644
> --- a/hw/i386/acpi-dsdt-cpu-hotplug.dsl
> +++ b/hw/i386/acpi-dsdt-cpu-hotplug.dsl
> @@ -20,6 +20,7 @@
>  Scope(\_SB) {
>      /* Objects filled in by run-time generated SSDT */
>      External(NTFY, MethodObj)
> +    External(\_SB.CPHD.PRSC, MethodObj)
>      External(CPON, PkgObj)
>  
>      /* Methods called by run-time generated SSDT Processor objects */
> @@ -51,42 +52,4 @@ Scope(\_SB) {
>          // _EJ0 method - eject callback
>          Sleep(200)
>      }
> -
> -    OperationRegion(PRST, SystemIO, 0xaf00, 32)
> -    Field(PRST, ByteAcc, NoLock, Preserve) {
> -        PRS, 256
> -    }
> -    Method(PRSC, 0) {
> -        // Local5 = active cpu bitmap
> -        Store(PRS, Local5)
> -        // Local2 = last read byte from bitmap
> -        Store(Zero, Local2)
> -        // Local0 = Processor ID / APIC ID iterator
> -        Store(Zero, Local0)
> -        While (LLess(Local0, SizeOf(CPON))) {
> -            // Local1 = CPON flag for this cpu
> -            Store(DerefOf(Index(CPON, Local0)), Local1)
> -            If (And(Local0, 0x07)) {
> -                // Shift down previously read bitmap byte
> -                ShiftRight(Local2, 1, Local2)
> -            } Else {
> -                // Read next byte from cpu bitmap
> -                Store(DerefOf(Index(Local5, ShiftRight(Local0, 3))), Local2)
> -            }
> -            // Local3 = active state for this cpu
> -            Store(And(Local2, 1), Local3)
> -
> -            If (LNotEqual(Local1, Local3)) {
> -                // State change - update CPON with new state
> -                Store(Local3, Index(CPON, Local0))
> -                // Do CPU notify
> -                If (LEqual(Local3, 1)) {
> -                    NTFY(Local0, 1)
> -                } Else {
> -                    NTFY(Local0, 3)
> -                }
> -            }
> -            Increment(Local0)
> -        }
> -    }
>  }
> diff --git a/hw/i386/acpi-dsdt.dsl b/hw/i386/acpi-dsdt.dsl
> index 90efce0..fa9f2d4 100644
> --- a/hw/i386/acpi-dsdt.dsl
> +++ b/hw/i386/acpi-dsdt.dsl
> @@ -311,7 +311,7 @@ DefinitionBlock (
>          }
>          Method(_E02) {
>              // CPU hotplug event
> -            \_SB.PRSC()
> +            \_SB.CPHD.PRSC()
>          }
>          Method(_L03) {
>          }
> diff --git a/hw/i386/q35-acpi-dsdt.dsl b/hw/i386/q35-acpi-dsdt.dsl
> index 22baa58..9ccc543 100644
> --- a/hw/i386/q35-acpi-dsdt.dsl
> +++ b/hw/i386/q35-acpi-dsdt.dsl
> @@ -420,7 +420,7 @@ DefinitionBlock (
>          }
>          Method(_E02) {
>              // CPU hotplug event
> -            \_SB.PRSC()
> +            \_SB.CPHD.PRSC()
>          }
>          Method(_L03) {
>          }
> diff --git a/hw/i386/ssdt-misc.dsl b/hw/i386/ssdt-misc.dsl
> index a4484b8..ec8893c 100644
> --- a/hw/i386/ssdt-misc.dsl
> +++ b/hw/i386/ssdt-misc.dsl
> @@ -116,4 +116,69 @@ DefinitionBlock ("ssdt-misc.aml", "SSDT", 0x01, "BXPC", "BXSSDTSUSP", 0x1)
>              }
>          }
>      }
> +    Scope(\_SB) {
> +        External(NTFY, MethodObj)
> +        External(CPON, PkgObj)
> +
> +        Device(CPHD) {
> +            Name(_HID, EISAID("PNP0C08"))
> +            Name(CPPL, 32) // cpu-gpe length
> +            Name(CPHP, 0xaf00)
> +
> +            OperationRegion(PRST, SystemIO, CPHP, CPPL)
> +            Field(PRST, ByteAcc, NoLock, Preserve) {
> +                PRS, 256
> +            }
> +
> +            Method(PRSC, 0) {
> +                // Local5 = active cpu bitmap
> +                Store(PRS, Local5)
> +                // Local2 = last read byte from bitmap
> +                Store(Zero, Local2)
> +                // Local0 = Processor ID / APIC ID iterator
> +                Store(Zero, Local0)
> +                While (LLess(Local0, SizeOf(CPON))) {
> +                    // Local1 = CPON flag for this cpu
> +                    Store(DerefOf(Index(CPON, Local0)), Local1)
> +                    If (And(Local0, 0x07)) {
> +                        // Shift down previously read bitmap byte
> +                        ShiftRight(Local2, 1, Local2)
> +                    } Else {
> +                        // Read next byte from cpu bitmap
> +                        Store(DerefOf(Index(Local5, ShiftRight(Local0, 3))), Local2)
> +                    }
> +                    // Local3 = active state for this cpu
> +                    Store(And(Local2, 1), Local3)
> +
> +                    If (LNotEqual(Local1, Local3)) {
> +                        // State change - update CPON with new state
> +                        Store(Local3, Index(CPON, Local0))
> +                        // Do CPU notify
> +                        If (LEqual(Local3, 1)) {
> +                            NTFY(Local0, 1)
> +                        } Else {
> +                            NTFY(Local0, 3)
> +                        }
> +                    }
> +                    Increment(Local0)
> +                }
> +            }
> +
> +            /* Leave bit 0 cleared to avoid Windows BSOD */
> +            Name(_STA, 0xA)
> +
> +            Method(_CRS, 0) {
> +                Store(ResourceTemplate() {
> +                    IO(Decode16, 0x00, 0x00, 0x01, 0x15, IO)
> +                }, Local0)
> +
> +                CreateWordField(Local0, IO._MIN, IOMN)
> +                CreateWordField(Local0, IO._MAX, IOMX)
> +
> +                Store(CPHP, IOMN)
> +                Subtract(Add(CPHP, CPPL), 1, IOMX)
> +                Return(Local0)
> +            }
> +        } // Device(CPHD)
> +    } // Scope(\_SB)
>  }
> -- 
> 1.8.3.1