My analysis was finished. Please try this patch.
--- exfield.c- Thu Jul 4 21:54:24 2002
+++ exfield.c Thu Jul 4 21:55:02 2002
@@ -200,7 +200,7 @@
/* Handle both ACPI 1.0 and ACPI 2.0 Integer widths */
IntegerSize = sizeof (ACPI_INTEGER);
- if (WalkState->MethodNode->Flags & ANOBJ_DATA_WIDTH_32)
+ if (WalkState->MethodNode != NULL && WalkState->MethodNode->Flags &
+ANOBJ_DATA_WIDTH_32)
{
/*
* We are running a method that exists in a 32-bit ACPI table.
BTW, this bug already fixed in 20020517 version.
> > > acpi0: <ASUS CUSL2 > on motherboard
> > >
> > >
> > > Fatal trap 12: page fault while in kernel mode
> > > fault virtual address = 0x16
> > > fault code = supervisor read, page not present
> > > instruction pointer = 0x8:0xc04f9aca
> > > stack pointer = 0x10:0xc054ea14
> > > frame pointer = 0x10:0xc054ea34
> > > code segment = base 0x0, limit 0xfffff, type 0x1b
> > > = DPL 0, pres 1, def32 1, gran 1
> > > processor eflags = interrupt enabled, resume, IOPL = 0
> > > current process = 0 (swapper)
> > > kernel: type 12 trap, code=0
> > > Stopped at AcpiExReadDataFromField+0x5a: movzbl 0x16(%eax),%eax
> > > db> trace
> > > AcpiExReadDataFromField(c0f00400,c25da200,c054ea50,c25e50c0,0) at
>AcpiExReadDataFromField+0x5a
>
> # if my understanding on i386 asm is correct,
> I think this is at (exfield.c):
> 203: if (WalkState->MethodNode->Flags & ANOBJ_DATA_WIDTH_32)
> where WalkState->MethodNode is NULL, this caused page fault.
>
> I'm waiting for further debug info. but I'll try to find where
> WalkState->MethodNode suppose to be set...
WalkState->MethodNode was initialized to NULL in AcpiDsInitAmlWalk()
which called by AcpiDsExecuteArguments(). AcpiExReadDataFromField()
assumes that WalkState->MethodNode always has a correct pointer.
That's the problem, I think.
ACPI_STATUS
AcpiDsExecuteArguments (
ACPI_NAMESPACE_NODE *Node,
ACPI_NAMESPACE_NODE *ScopeNode,
UINT32 AmlLength,
UINT8 *AmlStart)
...
Status = AcpiDsInitAmlWalk (WalkState, Op, NULL, AmlStart,
AmlLength, NULL, NULL, 3);
...
AcpiDsInitAmlWalk (
ACPI_WALK_STATE *WalkState,
ACPI_PARSE_OBJECT *Op,
ACPI_NAMESPACE_NODE *MethodNode,
UINT8 *AmlStart,
UINT32 AmlLength,
ACPI_OPERAND_OBJECT **Params,
ACPI_OPERAND_OBJECT **ReturnObjDesc,
UINT32 PassNumber)
Thanks
To Unsubscribe: send mail to [EMAIL PROTECTED]
with "unsubscribe freebsd-current" in the body of the message
