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ACPI!Store函数和hal!HalSetBusDataByOffset的关系----非常重要
0: kd> g
Breakpoint 10 hit
eax=f7424305 ebx=894ea000 ecx=899b0bd8 edx=524d454f esi=894ebcbc edi=00000001
eip=f7424305 esp=f789a090 ebp=f789a0a8 iopl=0 nv up ei ng nz na pe nc
cs=0008 ss=0010 ds=0023 es=0023 fs=0030 gs=0000 efl=00000286
ACPI!Store:
f7424305 55 push ebp
0: kd> dv
pctxt = 0x894ea000
pterm = 0x894ebcbc
pdata = 0x00000008
0: kd> dx -r1 ((ACPI!_term *)0x894ebcbc)
((ACPI!_term *)0x894ebcbc) : 0x894ebcbc [Type: _term *]
[+0x000] FrameHdr [Type: _framehdr]
[+0x010] pbOpTerm : 0x899b4101 : 0x70 [Type: unsigned char *]
[+0x014] pbOpEnd : 0x0 [Type: unsigned char *]
[+0x018] pbScopeEnd : 0x899b4122 : 0x0 [Type: unsigned char *]
[+0x01c] pamlterm : 0xf7439550 [Type: _amlterm *]
[+0x020] pnsObj : 0x0 [Type: _NSObj *]
[+0x024] iArg : 2 [Type: int]
[+0x028] icArgs : 2 [Type: int]
[+0x02c] pdataArgs : 0x894ea1c8 [Type: _ObjData *]
[+0x030] pdataResult : 0x894ea0fc [Type: _ObjData *]
0: kd> dx -r1 ((ACPI!_ObjData *)0x894ea1c8)
((ACPI!_ObjData *)0x894ea1c8) : 0x894ea1c8 [Type: _ObjData *]
[+0x000] dwfData : 0x0 [Type: unsigned short]
[+0x002] dwDataType : 0x1 [Type: unsigned short]
[+0x004] dwRefCount : 0x0 [Type: unsigned long]
[+0x004] pdataBase : 0x0 [Type: _ObjData *]
[+0x008] dwDataValue : 0x40e98102[Type: unsigned long]
[+0x008] uipDataValue : 0x40e98102 [Type: unsigned long]
[+0x008] pnsAlias : 0x40e98102 [Type: _NSObj *]
[+0x008] pdataAlias : 0x40e98102 [Type: _ObjData *]
[+0x008] powner : 0x40e98102 [Type: void *]
[+0x00c] dwDataLen : 0x0 [Type: unsigned long]
[+0x010] pbDataBuff : 0x0 [Type: unsigned char *]
0: kd> dx -r1 ((ACPI!_ctxt *)0x894ea000)
((ACPI!_ctxt *)0x894ea000) : 0x894ea000 [Type: _ctxt *]
[+0x000] dwSig : 0x54585443 [Type: unsigned long]
[+0x004] pbCtxtEnd : 0x894ec000 : 0xc8 [Type: unsigned char *]
[+0x008] listCtxt [Type: _List]
[+0x010] listQueue [Type: _List]
[+0x018] pplistCtxtQueue : 0x0 [Type: _List * *]
[+0x01c] plistResources : 0x894ea198 [Type: _List *]
[+0x020] dwfCtxt : 0x10 [Type: unsigned long]
[+0x024] pnsObj : 0x899b4938 [Type: _NSObj *]
[+0x028] pnsScope : 0x899b40ac [Type: _NSObj *]
[+0x02c] powner : 0x894ea1ac [Type: _objowner *]
[+0x030] pcall : 0x894ebd18 [Type: _call *]
[+0x034] pnctxt : 0x0 [Type: _nestedctxt *]
[+0x038] dwSyncLevel : 0xf [Type: unsigned long]
[+0x03c] pbOp : 0x899b4122 : 0x0 [Type: unsigned char *]
[+0x040] Result [Type: _ObjData]
[+0x054] pfnAsyncCallBack : 0xf741eeb5 [Type: void (__cdecl*)(_NSObj *,long,_ObjData *,void *)]
[+0x058] pdataCallBack : 0x899ae2a4 [Type: _ObjData *]
[+0x05c] pvContext : 0xf789a17c [Type: void *]
[+0x060] Timer [Type: _KTIMER]
[+0x088] Dpc [Type: _KDPC]
[+0x0a8] pheapCurrent : 0x894ea0bc [Type: _heap *]
[+0x0ac] CtxtData [Type: _ctxtdata]
[+0x0bc] LocalHeap [Type: _heap]
0: kd> dx -r1 ((ACPI!_NSObj *)0x899b40ac)
((ACPI!_NSObj *)0x899b40ac) : 0x899b40ac [Type: _NSObj *]
[+0x000] list [Type: _List]
[+0x008] pnsParent : 0x899af0f0 [Type: _NSObj *]
[+0x00c] pnsFirstChild : 0x0 [Type: _NSObj *]
[+0x010] dwNameSeg : 0x434f5649 [Type: unsigned long]
[+0x014] hOwner : 0x899af330 [Type: void *]
[+0x018] pnsOwnedNext : 0x899b4068 [Type: _NSObj *]
[+0x01c] ObjData [Type: _ObjData]
[+0x030] Context : 0x0 [Type: void *]
[+0x034] dwRefCount : 0x0 [Type: unsigned long]
0: kd> db 0x899b40ac
899b40ac ac ff 9a 89 30 41 9b 89-f0 f0 9a 89 00 00 00 00 ....0A..........
899b40bc 49 56 4f 43 30 f3 9a 89-68 40 9b 89 00 00 08 00 IVOC0...h@......
899b40cc 00 00 00 00 00 00 00 00-32 00 00 00 f0 40 9b 89 ........2....@..
899b40dc 00 00 00 00 00 00 00 00-48 4d 45 54 40 00 00 00 ........HMET@...
899b40ec 00 f0 9a 89 00 00 00 00-00 00 00 00 00 00 00 00 ................
899b40fc 00 00 00 00 02 70 7d 7d-79 0b e9 40 0a 10 00 79 .....p}}y..@...y
899b410c 68 0a 08 00 00 69 00 5c-2f 03 5f 53 42 5f 50 43 h....i.\/._SB_PC
899b411c 49 30 4f 45 4d 52 00 00-48 4e 53 4f 44 00 00 00 I0OEMR..HNSOD...
0: kd> db 0x899af0f0
899af0f0 ac f0 9a 89 34 f1 9a 89-24 f0 9a 89 74 f4 9a 89 ....4...$...t...
899af100 5f 53 42 5f 00 00 00 00-00 00 00 00 00 00 00 00 _SB_............
899af110 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
899af120 18 1a 98 89 00 00 00 00-48 4e 53 4f 44 00 00 00 ........HNSOD...
899af130 00 f0 9a 89 f0 f0 9a 89-78 f1 9a 89 24 f0 9a 89 ........x...$...
899af140 00 00 00 00 5f 53 49 5f-00 00 00 00 00 00 00 00 ...._SI_........
899af150 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 ................
899af160 00 00 00 00 00 00 00 00-00 00 00 00 48 4e 53 4f ............HNSO
0: kd> dx -r1 ((ACPI!_term *)0x894ebcbc)
((ACPI!_term *)0x894ebcbc) : 0x894ebcbc [Type: _term *]
[+0x000] FrameHdr [Type: _framehdr]
[+0x010] pbOpTerm : 0x899b4101 : 0x70 [Type: unsigned char *]
[+0x014] pbOpEnd : 0x0 [Type: unsigned char *]
[+0x018] pbScopeEnd : 0x899b4122 : 0x0 [Type: unsigned char *]
[+0x01c] pamlterm : 0xf7439550 [Type: _amlterm *]
[+0x020] pnsObj : 0x0 [Type: _NSObj *]
[+0x024] iArg : 2 [Type: int]
[+0x028] icArgs : 2 [Type: int]
[+0x02c] pdataArgs : 0x894ea1c8 [Type: _ObjData *]
[+0x030] pdataResult : 0x894ea0fc [Type: _ObjData *]

Scope (_SB)
{

Method (IVOC, 2, NotSerialized)
{
Store (Or (Or (ShiftLeft (0x40E9, 0x10), ShiftLeft (Arg0, 0x08
)), Arg1), \_SB.PCI0.OEMR)
}

OperationRegion (RE00, PCI_Config, 0xD8, 0x04)
Field (RE00, DWordAcc, NoLock, Preserve)
{
OEMR, 32
}

调用IVOC的方法举例：Method (VMPS

Method (VMPS, 1, NotSerialized)
{
Acquire (OEML, 0xFFFF)
IVOC (0x81, Arg0)
Store (\_SB.PCI0.OEMR, Local0)
Release (OEML)
Return (Local0)
}

Device (BAT1)
{
Name (_HID, EisaId ("PNP0C0A")) // _HID: Hardware ID
Name (_UID, 0x01) // _UID: Unique ID
Name (_PCL, Package (0x01) // _PCL: Power Consumer List
{
\_SB
})
Method (_STA, 0, NotSerialized) // _STA: Status
{
Return (VMPS (0x01))
}

Device (BAT2)
{
Name (_HID, EisaId ("PNP0C0A")) // _HID: Hardware ID
Name (_UID, 0x02) // _UID: Unique ID
Name (_PCL, Package (0x01) // _PCL: Power Consumer List
{
\_SB
})
Method (_STA, 0, NotSerialized) // _STA: Status
{
Return (VMPS (0x02))
}

0: kd> g
OpRegion Access on region 899b0b50 device 899affac
DeviceHandle 0
Return from OR handler - status 103
Breakpoint 9 hit
eax=00000000 ebx=89924050 ecx=00000004 edx=00000028 esi=00000000 edi=00000000
eip=804f2676 esp=f791abdc ebp=f791ac48 iopl=0 nv up ei pl zr na pe nc
cs=0008 ss=0010 ds=0023 es=0023 fs=0030 gs=0000 efl=00000246
hal!HalSetBusDataByOffset:
804f2676 55 push ebp
1: kd> dv
BusDataType = PCIConfiguration (0n4)
BusNumber = 0
SlotNumber = 0
Buffer = 0x894ebc28
Offset = 0xd8
Length = 4
bus = struct _BUS_HANDLER
1: kd> db 0x894ebc28
894ebc28 02 81 e9 40ff ff ff ff-00 00 00 00 00 00 00 00 ...@............

第三部分：猜想，得到\_SB.PCI0.OEMR的值为0，说明没有这个设备？

1: kd> g
Breakpoint 1 hit
eax=f791ab6c ebx=8993ee10 ecx=00000000 edx=899b0b50 esi=804fb6c4 edi=f791abd8
eip=804f18ec esp=f791ab48 ebp=f791abd8 iopl=0 nv up ei ng nz ac po cy
cs=0008 ss=0010 ds=0023 es=0023 fs=0030 gs=0000 efl=00000293
hal!HalpGetPCIData:
804f18ec 55 push ebp
1: kd> gu
eax=00000004 ebx=8993ee10 ecx=00000000 edx=00000cf8 esi=804fb6c4 edi=f791abd8
eip=804f2640 esp=f791ab64 ebp=f791abd8 iopl=0 nv up ei pl nz na po nc
cs=0008 ss=0010 ds=0023 es=0023 fs=0030 gs=0000 efl=00000202
hal!HalGetBusDataByOffset+0x52:
804f2640 5f pop edi
1: kd> dv
BusDataType = PCIConfiguration (0n4)
BusNumber = 0
SlotNumber = 0
Buffer = 0x894ebd84
Offset = 0xd8
Length = 4
bus = struct _BUS_HANDLER
1: kd> db 0x894ebd84
894ebd84 00 00 00 00 00 00 00 00-00 00 00 00 20 00 00 00 ............ ...

说明没有这个设备？