[SeaBIOS] iasl compiler/disassembler getting confused by Scope operator

Moore, Robert robert.moore at intel.com
Wed Nov 20 18:08:43 CET 2013


We've made some recent changes in this area. Please try iasl version 20131115.
Thanks,
Bob


> -----Original Message-----
> From: Michael S. Tsirkin [mailto:mst at redhat.com]
> Sent: Wednesday, November 20, 2013 8:59 AM
> To: Moore, Robert
> Cc: Kevin O'Connor; Idwer Vollering; seabios at seabios.org; Tang, Feng;
> coreboot at coreboot.org
> Subject: Re: iasl compiler/disassembler getting confused by Scope operator
> 
> Ping. any news?
> 
> On Tue, Oct 08, 2013 at 06:19:20AM +0000, Moore, Robert wrote:
> > I am out this week, will take a look when I get back.
> > Bob
> >
> >
> > > -----Original Message-----
> > > From: Michael S. Tsirkin [mailto:mst at redhat.com]
> > > Sent: Monday, October 07, 2013 12:18 AM
> > > To: Moore, Robert
> > > Cc: Kevin O'Connor; Idwer Vollering; seabios at seabios.org; Tang,
> > > Feng; coreboot at coreboot.org
> > > Subject: iasl compiler/disassembler getting confused by Scope
> > > operator
> > >
> > > I observe the following issue with acpica-tools-20130823-2.fc19.i686:
> > > Compile a file, disassemble it then compile again, this fails
> > > because the Extern directives produced by disassembler confuse the
> compiler.
> > >
> > > Wiuld be nice if this was fixed disasseble then compile is a nice
> > > sanity- check tool.
> > > Thanks!
> > >
> > > --->
> > >
> > > Original:
> > >
> > >
> > > /*
> > >  * Intel ACPI Component Architecture
> > >  * AML Disassembler version 20130823-32 [Aug 28 2013]
> > >  * Copyright (c) 2000 - 2013 Intel Corporation
> > >  *
> > >  * Disassembly of SSDT, Mon Oct  7 09:48:29 2013
> > >  *
> > >  * Original Table Header:
> > >  *     Signature        "SSDT"
> > >  *     Length           0x00000FE0 (4064)
> > >  *     Revision         0x01
> > >  *     Checksum         0x9F
> > >  *     OEM ID           "BOCHS "
> > >  *     OEM Table ID     "BXPCSSDT"
> > >  *     OEM Revision     0x00000001 (1)
> > >  *     Compiler ID      "BXPC"
> > >  *     Compiler Version 0x00000001 (1)
> > >  */
> > > DefinitionBlock ("SSDT.aml", "SSDT", 1, "BOCHS ", "BXPCSSDT",
> > > 0x00000001) {
> > >
> > >     External (_SB_.PCI0, DeviceObj)
> > >     External (_SB_.PCI0.ISA_, DeviceObj)
> > >     External (BNUM, FieldUnitObj)
> > >     External (CPEJ, MethodObj)    // 2 Arguments
> > >     External (CPMA, MethodObj)    // 1 Arguments
> > >     External (CPST, MethodObj)    // 1 Arguments
> > >     External (PCEJ, MethodObj)    // 2 Arguments
> > >     External (PCID, FieldUnitObj)
> > >     External (PCIU, FieldUnitObj)
> > >
> > >     Scope (\)
> > >     {
> > >         Name (P0S, 0x80000000)
> > >         Name (P0E, 0xFEBFFFFF)
> > >         Name (P1V, 0x00)
> > >         Name (P1S, Buffer (0x08)
> > >         {
> > >              0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
> > >         })
> > >         Name (P1E, Buffer (0x08)
> > >         {
> > >              0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
> > >         })
> > >         Name (P1L, Buffer (0x08)
> > >         {
> > >              0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
> > >         })
> > >     }
> > >
> > >     Scope (\)
> > >     {
> > >         Name (_S3, Package (0x04)  // _S3_: S3 System State
> > >         {
> > >             One,
> > >             One,
> > >             Zero,
> > >             Zero
> > >         })
> > >         Name (_S4, Package (0x04)  // _S4_: S4 System State
> > >         {
> > >             0x02,
> > >             0x02,
> > >             Zero,
> > >             Zero
> > >         })
> > >         Name (_S5, Package (0x04)  // _S5_: S5 System State
> > >         {
> > >             Zero,
> > >             Zero,
> > >             Zero,
> > >             Zero
> > >         })
> > >     }
> > >
> > >     Scope (\_SB.PCI0.ISA)
> > >     {
> > >         Device (PEVT)
> > >         {
> > >             Name (_HID, "QEMU0001")  // _HID: Hardware ID
> > >             Name (PEST, 0x0000)
> > >             OperationRegion (PEOR, SystemIO, PEST, One)
> > >             Field (PEOR, ByteAcc, NoLock, Preserve)
> > >             {
> > >                 PEPT,   8
> > >             }
> > >
> > >             Method (_STA, 0, NotSerialized)  // _STA: Status
> > >             {
> > >                 Store (PEST, Local0)
> > >                 If (LEqual (Local0, Zero))
> > >                 {
> > >                     Return (Zero)
> > >                 }
> > >                 Else
> > >                 {
> > >                     Return (0x0F)
> > >                 }
> > >             }
> > >
> > >             Method (RDPT, 0, NotSerialized)
> > >             {
> > >                 Store (PEPT, Local0)
> > >                 Return (Local0)
> > >             }
> > >
> > >             Method (WRPT, 1, NotSerialized)
> > >             {
> > >                 Store (Arg0, PEPT)
> > >             }
> > >
> > >             Name (_CRS, ResourceTemplate ()  // _CRS: Current
> > > Resource Settings
> > >             {
> > >                 IO (Decode16,
> > >                     0x0000,             // Range Minimum
> > >                     0x0000,             // Range Maximum
> > >                     0x01,               // Alignment
> > >                     0x01,               // Length
> > >                     _Y03)
> > >             })
> > >             CreateWordField (_CRS, \_SB.PCI0.ISA.PEVT._Y03._MIN,
> > > IOMN)  //
> > > _MIN: Minimum Base Address
> > >             CreateWordField (_CRS, \_SB.PCI0.ISA.PEVT._Y03._MAX,
> > > IOMX)  //
> > > _MAX: Maximum Base Address
> > >             Method (_INI, 0, NotSerialized)  // _INI: Initialize
> > >             {
> > >                 Store (PEST, IOMN)
> > >                 Store (PEST, IOMX)
> > >             }
> > >         }
> > >     }
> > >
> > >     Scope (_SB)
> > >     {
> > >         Scope (PCI0)
> > >         {
> > >             Name (BSEL, Zero)
> > >             Device (S18)
> > >             {
> > >                 Name (_SUN, 0x03)  // _SUN: Slot User Number
> > >                 Name (_ADR, 0x00030000)  // _ADR: Address
> > >                 Method (_EJ0, 1, NotSerialized)  // _EJx: Eject Device
> > >                 {
> > >                     PCEJ (BSEL, _SUN)
> > >                 }
> > >             }
> > >
> > >             Method (DVNT, 2, NotSerialized)
> > >             {
> > >                 If (And (Arg0, 0x08))
> > >                 {
> > >                     Notify (S18, Arg1)
> > >                 }
> > >             }
> > >
> > >             Method (PCNT, 0, NotSerialized)
> > >             {
> > >                 Store (Zero, BNUM)
> > >                 DVNT (PCIU, One)
> > >                 DVNT (PCID, 0x03)
> > >                 ^S20.PCNT ()
> > >             }
> > >
> > >             Device (S20)
> > >             {
> > >                 Name (_SUN, 0x04)  // _SUN: Slot User Number
> > >                 Name (_ADR, 0x00040000)  // _ADR: Address
> > >                 Name (BSEL, One)
> > >                 Method (PCNT, 0, NotSerialized)
> > >                 {
> > >                     Store (One, BNUM)
> > >                 }
> > >             }
> > >         }
> > >     }
> > > }
> > >
> > >
> > > ---
> > >
> > > Compile with iasl foo.dsl
> > >
> > > Disassemble with iasl -d -e DSDT SSDT.aml (see DSDT.dsl at the end
> > > of the mail).
> > >
> > >
> > > /*
> > >  * Intel ACPI Component Architecture
> > >  * AML Disassembler version 20130823-32 [Aug 28 2013]
> > >  * Copyright (c) 2000 - 2013 Intel Corporation
> > >  *
> > >  * Disassembly of SSDT.aml, Mon Oct  7 10:10:41 2013
> > >  *
> > >  * Original Table Header:
> > >  *     Signature        "SSDT"
> > >  *     Length           0x00000207 (519)
> > >  *     Revision         0x01
> > >  *     Checksum         0xBF
> > >  *     OEM ID           "BOCHS "
> > >  *     OEM Table ID     "BXPCSSDT"
> > >  *     OEM Revision     0x00000001 (1)
> > >  *     Compiler ID      "INTL"
> > >  *     Compiler Version 0x20130823 (538118179)
> > >  */
> > > DefinitionBlock ("SSDT.aml", "SSDT", 1, "BOCHS ", "BXPCSSDT",
> > > 0x00000001) {
> > >
> > >     External (_SB_.PCI0.ISA_, DeviceObj)
> > >     External (BNUM, FieldUnitObj)
> > >     External (PCEJ, MethodObj)    // 2 Arguments
> > >     External (PCI0, DeviceObj)
> > >     External (PCID, FieldUnitObj)
> > >     External (PCIU, FieldUnitObj)
> > >
> > >     Scope (\)
> > >     {
> > >         Name (P0S, 0x80000000)
> > >         Name (P0E, 0xFEBFFFFF)
> > >         Name (P1V, Zero)
> > >         Name (P1S, Buffer (0x08)
> > >         {
> > >              0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
> > >         })
> > >         Name (P1E, Buffer (0x08)
> > >         {
> > >              0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
> > >         })
> > >         Name (P1L, Buffer (0x08)
> > >         {
> > >              0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
> > >         })
> > >     }
> > >
> > >     Scope (\)
> > >     {
> > >         Name (_S3, Package (0x04)  // _S3_: S3 System State
> > >         {
> > >             One,
> > >             One,
> > >             Zero,
> > >             Zero
> > >         })
> > >         Name (_S4, Package (0x04)  // _S4_: S4 System State
> > >         {
> > >             0x02,
> > >             0x02,
> > >             Zero,
> > >             Zero
> > >         })
> > >         Name (_S5, Package (0x04)  // _S5_: S5 System State
> > >         {
> > >             Zero,
> > >             Zero,
> > >             Zero,
> > >             Zero
> > >         })
> > >     }
> > >
> > >     Scope (\_SB.PCI0.ISA)
> > >     {
> > >         Device (PEVT)
> > >         {
> > >             Name (_HID, "QEMU0001")  // _HID: Hardware ID
> > >             Name (PEST, Zero)
> > >             OperationRegion (PEOR, SystemIO, PEST, One)
> > >             Field (PEOR, ByteAcc, NoLock, Preserve)
> > >             {
> > >                 PEPT,   8
> > >             }
> > >
> > >             Method (_STA, 0, NotSerialized)  // _STA: Status
> > >             {
> > >                 Store (PEST, Local0)
> > >                 If (LEqual (Local0, Zero))
> > >                 {
> > >                     Return (Zero)
> > >                 }
> > >                 Else
> > >                 {
> > >                     Return (0x0F)
> > >                 }
> > >             }
> > >
> > >             Method (RDPT, 0, NotSerialized)
> > >             {
> > >                 Store (PEPT, Local0)
> > >                 Return (Local0)
> > >             }
> > >
> > >             Method (WRPT, 1, NotSerialized)
> > >             {
> > >                 Store (Arg0, PEPT)
> > >             }
> > >
> > >             Name (_CRS, ResourceTemplate ()  // _CRS: Current
> > > Resource Settings
> > >             {
> > >                 IO (Decode16,
> > >                     0x0000,             // Range Minimum
> > >                     0x0000,             // Range Maximum
> > >                     0x01,               // Alignment
> > >                     0x01,               // Length
> > >                     _Y00)
> > >             })
> > >             CreateWordField (_CRS, \_SB.PCI0.ISA.PEVT._Y00._MIN,
> > > IOMN)  //
> > > _MIN: Minimum Base Address
> > >             CreateWordField (_CRS, \_SB.PCI0.ISA.PEVT._Y00._MAX,
> > > IOMX)  //
> > > _MAX: Maximum Base Address
> > >             Method (_INI, 0, NotSerialized)  // _INI: Initialize
> > >             {
> > >                 Store (PEST, IOMN)
> > >                 Store (PEST, IOMX)
> > >             }
> > >         }
> > >     }
> > >
> > >     Scope (_SB)
> > >     {
> > >         Scope (PCI0)
> > >         {
> > >             Name (BSEL, Zero)
> > >             Device (S18)
> > >             {
> > >                 Name (_SUN, 0x03)  // _SUN: Slot User Number
> > >                 Name (_ADR, 0x00030000)  // _ADR: Address
> > >                 Method (_EJ0, 1, NotSerialized)  // _EJx: Eject Device
> > >                 {
> > >                     PCEJ (BSEL, _SUN)
> > >                 }
> > >             }
> > >
> > >             Method (DVNT, 2, NotSerialized)
> > >             {
> > >                 If (And (Arg0, 0x08))
> > >                 {
> > >                     Notify (S18, Arg1)
> > >                 }
> > >             }
> > >
> > >             Method (PCNT, 0, NotSerialized)
> > >             {
> > >                 Store (Zero, BNUM)
> > >                 DVNT (PCIU, One)
> > >                 DVNT (PCID, 0x03)
> > >                 ^S20.PCNT ()
> > >             }
> > >
> > >             Device (S20)
> > >             {
> > >                 Name (_SUN, 0x04)  // _SUN: Slot User Number
> > >                 Name (_ADR, 0x00040000)  // _ADR: Address
> > >                 Name (BSEL, One)
> > >                 Method (PCNT, 0, NotSerialized)
> > >                 {
> > >                     Store (One, BNUM)
> > >                 }
> > >             }
> > >         }
> > >     }
> > > }
> > >
> > > <----
> > >
> > > Compilation error:
> > > Intel ACPI Component Architecture
> > > ASL Optimizing Compiler version 20130823-32 [Aug 28 2013] Copyright
> > > (c)
> > > 2000 - 2013 Intel Corporation
> > >
> > > SSDT.dsl    130:         Scope (PCI0)
> > > Error    6117 -                   ^ Existing object has invalid type
> for
> > > Scope operator (PCI0 [Untyped])
> > >
> > >
> > >
> > > If you compane the original and the disassebled result, you see the
> issue:
> > >
> > >
> > >  DefinitionBlock ("SSDT.aml", "SSDT", 1, "BOCHS ", "BXPCSSDT",
> > > 0x00000001)
> > >  {
> > >
> > > -    External (_SB_.PCI0, DeviceObj)
> > >      External (_SB_.PCI0.ISA_, DeviceObj)
> > >      External (BNUM, FieldUnitObj)
> > >      External (CPEJ, MethodObj)    // 2 Arguments
> > >      External (CPMA, MethodObj)    // 1 Arguments
> > >      External (CPST, MethodObj)    // 1 Arguments
> > >      External (PCEJ, MethodObj)    // 2 Arguments
> > > +    External (PCI0, DeviceObj)
> > >      External (PCID, FieldUnitObj)
> > >      External (PCIU, FieldUnitObj)
> > >
> > >
> > > So External (_SB_.PCI0.ISA_, DeviceObj) implicitly defines PCI0 as
> > > an untyped object, Scope (PCI0) is then taken to refer to that
> > > (since it's in the correct namespace).
> > > Also, External (PCI0, DeviceObj) is produced in the wrong namespace.
> > >
> > >
> > > To reproduce you will need a DSDT (for disassembler), see DSDT.dsl
> below:
> > >
> > >
> > > /*
> > >  * Intel ACPI Component Architecture
> > >  * AML Disassembler version 20130823-32 [Aug 28 2013]
> > >  * Copyright (c) 2000 - 2013 Intel Corporation
> > >  *
> > >  * Disassembly of DSDT, Mon Oct  7 09:58:06 2013
> > >  *
> > >  * Original Table Header:
> > >  *     Signature        "DSDT"
> > >  *     Length           0x00001158 (4440)
> > >  *     Revision         0x01 **** 32-bit table (V1), no 64-bit math
> > > support
> > >  *     Checksum         0xC6
> > >  *     OEM ID           "BXPC"
> > >  *     OEM Table ID     "BXDSDT"
> > >  *     OEM Revision     0x00000001 (1)
> > >  *     Compiler ID      "INTL"
> > >  *     Compiler Version 0x20130823 (538118179)
> > >  */
> > > DefinitionBlock ("DSDT.aml", "DSDT", 1, "BXPC", "BXDSDT", 0x00000001)
> {
> > >     External (_SB_.PCI0.PCNT, MethodObj)
> > >     External (NTFY, MethodObj)
> > >
> > >     External (CPON)
> > >     External (P0E_, IntObj)
> > >     External (P0S_, IntObj)
> > >     External (P1E_, IntObj)
> > >     External (P1L_, IntObj)
> > >     External (P1S_, IntObj)
> > >     External (P1V_)
> > >
> > >     Scope (\)
> > >     {
> > >         OperationRegion (DBG, SystemIO, 0x0402, One)
> > >         Field (DBG, ByteAcc, NoLock, Preserve)
> > >         {
> > >             DBGB,   8
> > >         }
> > >
> > >         Method (DBUG, 1, NotSerialized)
> > >         {
> > >             ToHexString (Arg0, Local0)
> > >             ToBuffer (Local0, Local0)
> > >             Subtract (SizeOf (Local0), One, Local1)
> > >             Store (Zero, Local2)
> > >             While (LLess (Local2, Local1))
> > >             {
> > >                 Store (DerefOf (Index (Local0, Local2)), DBGB)
> > >                 Increment (Local2)
> > >             }
> > >
> > >             Store (0x0A, DBGB)
> > >         }
> > >     }
> > >
> > >     Scope (_SB)
> > >     {
> > >         Device (PCI0)
> > >         {
> > >             Name (_HID, EisaId ("PNP0A03"))  // _HID: Hardware ID
> > >             Name (_ADR, Zero)  // _ADR: Address
> > >             Name (_UID, One)  // _UID: Unique ID
> > >         }
> > >     }
> > >
> > >     Scope (_SB.PCI0)
> > >     {
> > >         Device (ISA)
> > >         {
> > >             Name (_ADR, 0x00010000)  // _ADR: Address
> > >             OperationRegion (P40C, PCI_Config, 0x60, 0x04)
> > >             Name (FDEN, One)
> > >         }
> > >     }
> > >
> > >     Scope (_SB.PCI0)
> > >     {
> > >         OperationRegion (PCST, SystemIO, 0xAE00, 0x08)
> > >         Field (PCST, DWordAcc, NoLock, WriteAsZeros)
> > >         {
> > >             PCIU,   32,
> > >             PCID,   32
> > >         }
> > >
> > >         OperationRegion (SEJ, SystemIO, 0xAE08, 0x04)
> > >         Field (SEJ, DWordAcc, NoLock, WriteAsZeros)
> > >         {
> > >             B0EJ,   32
> > >         }
> > >
> > >         OperationRegion (BNMR, SystemIO, 0xAE10, 0x04)
> > >         Field (BNMR, DWordAcc, NoLock, WriteAsZeros)
> > >         {
> > >             BNUM,   32
> > >         }
> > >
> > >         Mutex (BLCK, 0x00)
> > >         Method (PCEJ, 2, NotSerialized)
> > >         {
> > >             Acquire (BLCK, 0xFFFF)
> > >             Store (Arg0, BNUM)
> > >             Store (ShiftLeft (One, Arg1), B0EJ)
> > >             Release (BLCK)
> > >             Return (Zero)
> > >         }
> > >     }
> > >
> > >     Scope (_GPE)
> > >     {
> > >         Name (_HID, "ACPI0006")  // _HID: Hardware ID
> > >         Method (_L00, 0, NotSerialized)  // _Lxx: Level-Triggered GPE
> > >         {
> > >         }
> > >
> > >         Method (_E01, 0, NotSerialized)  // _Exx: Edge-Triggered GPE
> > >         {
> > >             Acquire (\_SB.PCI0.BLCK, 0xFFFF)
> > >             \_SB.PCI0.PCNT ()
> > >             Release (\_SB.PCI0.BLCK)
> > >         }
> > >
> > >     }
> > > }
> > >



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