Kernel

The Xbox kernel is called xboxkrnl.exe. It is closely related to the Windows NT ntoskrnl.exe. Its image base address is always 0x80010000.

Header modifications

xboxkrnl.exe is a mostly standard exe file. However, the MS-DOS header was patched to contain Xbox specific data in the reserved 20 byte block starting at offset 40:

Offset	Meaning
40	Size of uninitialized portion of the .data section
44	Size of initialized portion of the .data section
48	Memory address of initialized portion of the .data section (usually in Flash). Used to re-initialize the data section pointed to by the next field. Note that the pointer might be invalid during normal execution as the Flash might not be mapped at all times.
52	Memory address where the .data section is stored (usually the same as in the section header + image base).

Sections

All sections are identity mapped (meaning file offsets and offsets in RAM match). This is because the kernel is not loaded through a traditional PE / exe loader, but just unpacked into memory.

.text

The .text section contains all x86 subroutines to be executed by the processor.

.rdata

The .rdata section contains the kernel thunk table. The ordinals in the table are to be resolved to the kernel's actual calling routine, when loaded.

.data

The .data section stores initialized and uninitialized data. A copy of the initialized portion of this section is usually stored in the BIOS.

STICKY

Stores variables which must be preserved across a quick-reboot.

IDEXPRDT

A Physical Region Descriptor Table (PRDT) for the IDE bus. This section serves as a memory allocation only, it does not have to be initialized when loading the kernel^{[citation needed]}.

INIT

This section is always the last one. It contains the entrypoint of the kernel. Later kernels^[FIXME] will discard this section after initialization.

Kernel exports

Kernel exports

Name	Ordinal	Calling Convention	Notes
Kernel/AvGetSavedDataAddress	1	stdcall
Kernel/AvSendTVEncoderOption	2	stdcall
Kernel/AvSetDisplayMode	3	stdcall
Kernel/AvSetSavedDataAddress	4	stdcall
Kernel/DbgBreakPoint	5	stdcall
Kernel/DbgBreakPointWithStatus	6	stdcall
Kernel/DbgLoadImageSymbols	7	stdcall	Devkits only!
Kernel/DbgPrint	8	stdcall
Kernel/HalReadSMCTrayState	9	stdcall
Kernel/DbgPrompt	10	stdcall
Kernel/DbgUnLoadImageSymbols	11	stdcall	Devkits only!
Kernel/ExAcquireReadWriteLockExclusive	12	stdcall
Kernel/ExAcquireReadWriteLockShared	13	stdcall
Kernel/ExAllocatePool	14	stdcall
Kernel/ExAllocatePoolWithTag	15	stdcall
Kernel/ExEventObjectType	16	stdcall	Variable?
Kernel/ExFreePool	17	stdcall
Kernel/ExInitializeReadWriteLock	18	stdcall
Kernel/ExInterlockedAddLargeInteger	19	stdcall
Kernel/ExInterlockedAddLargeStatistic	20	fastcall
Kernel/ExInterlockedCompareExchange64	21	fastcall
Kernel/ExMutantObjectType	22	stdcall	Variable?
Kernel/ExQueryPoolBlockSize	23	stdcall
Kernel/ExQueryNonVolatileSetting	24	stdcall
Kernel/ExReadWriteRefurbInfo	25	stdcall
Kernel/ExRaiseException	26	stdcall
Kernel/ExRaiseStatus	27	stdcall
Kernel/ExReleaseReadWriteLock	28	stdcall
Kernel/ExSaveNonVolatileSetting	29	stdcall
Kernel/ExSemaphoreObjectType	30	stdcall	Variable?
Kernel/ExTimerObjectType	31	stdcall	Variable?
Kernel/ExfInterlockedInsertHeadList	32	stdcall
Kernel/ExfInterlockedInsertTailList	33	fastcall
Kernel/ExfInterlockedRemoveHeadList	34	fastcall
Kernel/FscGetCacheSize	35	stdcall
Kernel/FscInvalidateIdleBlocks	36	stdcall
Kernel/FscSetCacheSize	37	stdcall
Kernel/HalClearSoftwareInterrupt	38	fastcall
Kernel/HalDisableSystemInterrupt	39	stdcall
Kernel/HalDiskCachePartitionCount	40	stdcall	Variable?
Kernel/HalDiskModelNumber	41	stdcall	Variable?
Kernel/HalDiskSerialNumber	42	stdcall	Variable?
Kernel/HalEnableSystemInterrupt	43	stdcall
Kernel/HalGetInterruptVector	44	stdcall
Kernel/HalReadSMBusValue	45	stdcall
Kernel/HalReadWritePCISpace	46	stdcall
Kernel/HalRegisterShutdownNotification	47	stdcall
Kernel/HalRequestSoftwareInterrupt	48	fastcall
Kernel/HalReturnToFirmware	49	stdcall
Kernel/HalWriteSMBusValue	50	stdcall
Kernel/InterlockedCompareExchange	51	fastcall
Kernel/InterlockedDecrement	52	fastcall
Kernel/InterlockedIncrement	53	fastcall
Kernel/InterlockedExchange	54	fastcall
Kernel/InterlockedExchangeAdd	55	fastcall
Kernel/InterlockedFlushSList	56	fastcall
Kernel/InterlockedPopEntrySList	57	fastcall
Kernel/InterlockedPushEntrySList	58	fastcall
Kernel/IoAllocateIrp	59	stdcall
Kernel/IoBuildAsynchronousFsdRequest	60	stdcall
Kernel/IoBuildDeviceIoControlRequest	61	stdcall
Kernel/IoBuildSynchronousFsdRequest	62	stdcall
Kernel/IoCheckShareAccess	63	stdcall
Kernel/IoCompletionObjectType	64	stdcall	Variable?
Kernel/IoCreateDevice	65	stdcall
Kernel/IoCreateFile	66	stdcall
Kernel/IoCreateSymbolicLink	67	stdcall
Kernel/IoDeleteDevice	68	stdcall
Kernel/IoDeleteSymbolicLink	69	stdcall
Kernel/IoDeviceObjectType	70	stdcall	Variable?
Kernel/IoFileObjectType	71	stdcall	Variable?
Kernel/IoFreeIrp	72	stdcall
Kernel/IoInitializeIrp	73	stdcall
Kernel/IoInvalidDeviceRequest	74	stdcall
Kernel/IoQueryFileInformation	75	stdcall
Kernel/IoQueryVolumeInformation	76	stdcall
Kernel/IoQueueThreadIrp	77	stdcall
Kernel/IoRemoveShareAccess	78	stdcall
Kernel/IoSetIoCompletion	79	stdcall
Kernel/IoSetShareAccess	80	stdcall
Kernel/IoStartNextPacket	81	stdcall
Kernel/IoStartNextPacketByKey	82	stdcall
Kernel/IoStartPacket	83	stdcall
Kernel/IoSynchronousDeviceIoControlRequest	84	stdcall
Kernel/IoSynchronousFsdRequest	85	stdcall
Kernel/IofCallDriver	86	fastcall
Kernel/IofCompleteRequest	87	fastcall
Kernel/KdDebuggerEnabled	88	stdcall	Variable?
Kernel/KdDebuggerNotPresent	89	stdcall	Variable?
Kernel/IoDismountVolume	90	stdcall
Kernel/IoDismountVolumeByName	91	stdcall
Kernel/KeAlertResumeThread	92	stdcall
Kernel/KeAlertThread	93	stdcall
Kernel/KeBoostPriorityThread	94	stdcall
Kernel/KeBugCheck	95	stdcall
Kernel/KeBugCheckEx	96	stdcall
Kernel/KeCancelTimer	97	stdcall
Kernel/KeConnectInterrupt	98	stdcall
Kernel/KeDelayExecutionThread	99	stdcall
Kernel/KeDisconnectInterrupt	100	stdcall
Kernel/KeEnterCriticalRegion	101	stdcall
Kernel/MmGlobalData	102	stdcall	Variable?
Kernel/KeGetCurrentIrql	103	stdcall
Kernel/KeGetCurrentThread	104	stdcall
Kernel/KeInitializeApc	105	stdcall
Kernel/KeInitializeDeviceQueue	106	stdcall
Kernel/KeInitializeDpc	107	stdcall
Kernel/KeInitializeEvent	108	stdcall
Kernel/KeInitializeInterrupt	109	stdcall
Kernel/KeInitializeMutant	110	stdcall
Kernel/KeInitializeQueue	111	stdcall
Kernel/KeInitializeSemaphore	112	stdcall
Kernel/KeInitializeTimerEx	113	stdcall
Kernel/KeInsertByKeyDeviceQueue	114	stdcall
Kernel/KeInsertDeviceQueue	115	stdcall
Kernel/KeInsertHeadQueue	116	stdcall
Kernel/KeInsertQueue	117	stdcall
Kernel/KeInsertQueueApc	118	stdcall
Kernel/KeInsertQueueDpc	119	stdcall
Kernel/KeInterruptTime	120	stdcall	Variable?
Kernel/KeIsExecutingDpc	121	stdcall
Kernel/KeLeaveCriticalRegion	122	stdcall
Kernel/KePulseEvent	123	stdcall
Kernel/KeQueryBasePriorityThread	124	stdcall
Kernel/KeQueryInterruptTime	125	stdcall
Kernel/KeQueryPerformanceCounter	126	stdcall
Kernel/KeQueryPerformanceFrequency	127	stdcall
Kernel/KeQuerySystemTime	128	stdcall
Kernel/KeRaiseIrqlToDpcLevel	129	stdcall
Kernel/KeRaiseIrqlToSynchLevel	130	stdcall
Kernel/KeReleaseMutant	131	stdcall
Kernel/KeReleaseSemaphore	132	stdcall
Kernel/KeRemoveByKeyDeviceQueue	133	stdcall
Kernel/KeRemoveDeviceQueue	134	stdcall
Kernel/KeRemoveEntryDeviceQueue	135	stdcall
Kernel/KeRemoveQueue	136	stdcall
Kernel/KeRemoveQueueDpc	137	stdcall
Kernel/KeResetEvent	138	stdcall
Kernel/KeRestoreFloatingPointState	139	stdcall
Kernel/KeResumeThread	140	stdcall
Kernel/KeRundownQueue	141	stdcall
Kernel/KeSaveFloatingPointState	142	stdcall
Kernel/KeSetBasePriorityThread	143	stdcall
Kernel/KeSetDisableBoostThread	144	stdcall
Kernel/KeSetEvent	145	stdcall
Kernel/KeSetEventBoostPriority	146	stdcall
Kernel/KeSetPriorityProcess	147	stdcall
Kernel/KeSetPriorityThread	148	stdcall
Kernel/KeSetTimer	149	stdcall
Kernel/KeSetTimerEx	150	stdcall
Kernel/KeStallExecutionProcessor	151	stdcall
Kernel/KeSuspendThread	152	stdcall
Kernel/KeSynchronizeExecution	153	stdcall
Kernel/KeSystemTime	154	stdcall	Variable?
Kernel/KeTestAlertThread	155	stdcall
Kernel/KeTickCount	156	stdcall	Variable?
Kernel/KeTimeIncrement	157	stdcall	Variable?
Kernel/KeWaitForMultipleObjects	158	stdcall
Kernel/KeWaitForSingleObject	159	stdcall
Kernel/KfRaiseIrql	160	fastcall
Kernel/KfLowerIrql	161	fastcall
Kernel/KiBugCheckData	162	stdcall	Variable?
Kernel/KiUnlockDispatcherDatabase	163	fastcall
Kernel/LaunchDataPage	164	stdcall	Variable?
Kernel/MmAllocateContiguousMemory	165	stdcall
Kernel/MmAllocateContiguousMemoryEx	166	stdcall
Kernel/MmAllocateSystemMemory	167	stdcall
Kernel/MmClaimGpuInstanceMemory	168	stdcall
Kernel/MmCreateKernelStack	169	stdcall
Kernel/MmDeleteKernelStack	170	stdcall
Kernel/MmFreeContiguousMemory	171	stdcall
Kernel/MmFreeSystemMemory	172	stdcall
Kernel/MmGetPhysicalAddress	173	stdcall
Kernel/MmIsAddressValid	174	stdcall
Kernel/MmLockUnlockBufferPages	175	stdcall
Kernel/MmLockUnlockPhysicalPage	176	stdcall
Kernel/MmMapIoSpace	177	stdcall
Kernel/MmPersistContiguousMemory	178	stdcall
Kernel/MmQueryAddressProtect	179	stdcall
Kernel/MmQueryAllocationSize	180	stdcall
Kernel/MmQueryStatistics	181	stdcall
Kernel/MmSetAddressProtect	182	stdcall
Kernel/MmUnmapIoSpace	183	stdcall
Kernel/NtAllocateVirtualMemory	184	stdcall
Kernel/NtCancelTimer	185	stdcall
Kernel/NtClearEvent	186	stdcall
Kernel/NtClose	187	stdcall
Kernel/NtCreateDirectoryObject	188	stdcall
Kernel/NtCreateEvent	189	stdcall
Kernel/NtCreateFile	190	stdcall
Kernel/NtCreateIoCompletion	191	stdcall
Kernel/NtCreateMutant	192	stdcall
Kernel/NtCreateSemaphore	193	stdcall
Kernel/NtCreateTimer	194	stdcall
Kernel/NtDeleteFile	195	stdcall
Kernel/NtDeviceIoControlFile	196	stdcall
Kernel/NtDuplicateObject	197	stdcall
Kernel/NtFlushBuffersFile	198	stdcall
Kernel/NtFreeVirtualMemory	199	stdcall
Kernel/NtFsControlFile	200	stdcall
Kernel/NtOpenDirectoryObject	201	stdcall
Kernel/NtOpenFile	202	stdcall
Kernel/NtOpenSymbolicLinkObject	203	stdcall
Kernel/NtProtectVirtualMemory	204	stdcall
Kernel/NtPulseEvent	205	stdcall
Kernel/NtQueueApcThread	206	stdcall
Kernel/NtQueryDirectoryFile	207	stdcall
Kernel/NtQueryDirectoryObject	208	stdcall
Kernel/NtQueryEvent	209	stdcall
Kernel/NtQueryFullAttributesFile	210	stdcall
Kernel/NtQueryInformationFile	211	stdcall
Kernel/NtQueryIoCompletion	212	stdcall
Kernel/NtQueryMutant	213	stdcall
Kernel/NtQuerySemaphore	214	stdcall
Kernel/NtQuerySymbolicLinkObject	215	stdcall
Kernel/NtQueryTimer	216	stdcall
Kernel/NtQueryVirtualMemory	217	stdcall
Kernel/NtQueryVolumeInformationFile	218	stdcall
Kernel/NtReadFile	219	stdcall
Kernel/NtReadFileScatter	220	stdcall
Kernel/NtReleaseMutant	221	stdcall
Kernel/NtReleaseSemaphore	222	stdcall
Kernel/NtRemoveIoCompletion	223	stdcall
Kernel/NtResumeThread	224	stdcall
Kernel/NtSetEvent	225	stdcall
Kernel/NtSetInformationFile	226	stdcall
Kernel/NtSetIoCompletion	227	stdcall
Kernel/NtSetSystemTime	228	stdcall
Kernel/NtSetTimerEx	229	stdcall
Kernel/NtSignalAndWaitForSingleObjectEx	230	stdcall
Kernel/NtSuspendThread	231	stdcall
Kernel/NtUserIoApcDispatcher	232	stdcall
Kernel/NtWaitForSingleObject	233	stdcall
Kernel/NtWaitForSingleObjectEx	234	stdcall
Kernel/NtWaitForMultipleObjectsEx	235	stdcall
Kernel/NtWriteFile	236	stdcall
Kernel/NtWriteFileGather	237	stdcall
Kernel/NtYieldExecution	238	stdcall
Kernel/ObCreateObject	239	stdcall
Kernel/ObDirectoryObjectType	240	stdcall	Variable?
Kernel/ObInsertObject	241	stdcall
Kernel/ObMakeTemporaryObject	242	stdcall
Kernel/ObOpenObjectByName	243	stdcall
Kernel/ObOpenObjectByPointer	244	stdcall
Kernel/ObpObjectHandleTable	245	stdcall	Variable?
Kernel/ObReferenceObjectByHandle	246	stdcall
Kernel/ObReferenceObjectByName	247	stdcall
Kernel/ObReferenceObjectByPointer	248	stdcall
Kernel/ObSymbolicLinkObjectType	249	stdcall	Variable?
Kernel/ObfDereferenceObject	250	fastcall
Kernel/ObfReferenceObject	251	fastcall
Kernel/PhyGetLinkState	252	stdcall
Kernel/PhyInitialize	253	stdcall
Kernel/PsCreateSystemThread	254	stdcall
Kernel/PsCreateSystemThreadEx	255	stdcall
Kernel/PsQueryStatistics	256	stdcall
Kernel/PsSetCreateThreadNotifyRoutine	257	stdcall
Kernel/PsTerminateSystemThread	258	stdcall
Kernel/PsThreadObjectType	259	stdcall	Variable?
Kernel/RtlAnsiStringToUnicodeString	260	stdcall
Kernel/RtlAppendStringToString	261	stdcall
Kernel/RtlAppendUnicodeStringToString	262	stdcall
Kernel/RtlAppendUnicodeToString	263	stdcall
Kernel/RtlAssert	264	stdcall
Kernel/RtlCaptureContext	265	stdcall
Kernel/RtlCaptureStackBackTrace	266	stdcall
Kernel/RtlCharToInteger	267	stdcall
Kernel/RtlCompareMemory	268	stdcall
Kernel/RtlCompareMemoryUlong	269	stdcall
Kernel/RtlCompareString	270	stdcall
Kernel/RtlCompareUnicodeString	271	stdcall
Kernel/RtlCopyString	272	stdcall
Kernel/RtlCopyUnicodeString	273	stdcall
Kernel/RtlCreateUnicodeString	274	stdcall
Kernel/RtlDowncaseUnicodeChar	275	stdcall
Kernel/RtlDowncaseUnicodeString	276	stdcall
Kernel/RtlEnterCriticalSection	277	stdcall
Kernel/RtlEnterCriticalSectionAndRegion	278	stdcall
Kernel/RtlEqualString	279	stdcall
Kernel/RtlEqualUnicodeString	280	stdcall
Kernel/RtlExtendedIntegerMultiply	281	stdcall
Kernel/RtlExtendedLargeIntegerDivide	282	stdcall
Kernel/RtlExtendedMagicDivide	283	stdcall
Kernel/RtlFillMemory	284	stdcall
Kernel/RtlFillMemoryUlong	285	stdcall
Kernel/RtlFreeAnsiString	286	stdcall
Kernel/RtlFreeUnicodeString	287	stdcall
Kernel/RtlGetCallersAddress	288	stdcall
Kernel/RtlInitAnsiString	289	stdcall
Kernel/RtlInitUnicodeString	290	stdcall
Kernel/RtlInitializeCriticalSection	291	stdcall
Kernel/RtlIntegerToChar	292	stdcall
Kernel/RtlIntegerToUnicodeString	293	stdcall
Kernel/RtlLeaveCriticalSection	294	stdcall
Kernel/RtlLeaveCriticalSectionAndRegion	295	stdcall
Kernel/RtlLowerChar	296	stdcall
Kernel/RtlMapGenericMask	297	stdcall
Kernel/RtlMoveMemory	298	stdcall
Kernel/RtlMultiByteToUnicodeN	299	stdcall
Kernel/RtlMultiByteToUnicodeSize	300	stdcall
Kernel/RtlNtStatusToDosError	301	stdcall
Kernel/RtlRaiseException	302	stdcall
Kernel/RtlRaiseStatus	303	stdcall
Kernel/RtlTimeFieldsToTime	304	stdcall
Kernel/RtlTimeToTimeFields	305	stdcall
Kernel/RtlTryEnterCriticalSection	306	stdcall
Kernel/RtlUlongByteSwap	307	fastcall
Kernel/RtlUnicodeStringToAnsiString	308	stdcall
Kernel/RtlUnicodeStringToInteger	309	stdcall
Kernel/RtlUnicodeToMultiByteN	310	stdcall
Kernel/RtlUnicodeToMultiByteSize	311	stdcall
Kernel/RtlUnwind	312	stdcall
Kernel/RtlUpcaseUnicodeChar	313	stdcall
Kernel/RtlUpcaseUnicodeString	314	stdcall
Kernel/RtlUpcaseUnicodeToMultiByteN	315	stdcall
Kernel/RtlUpperChar	316	stdcall
Kernel/RtlUpperString	317	stdcall
Kernel/RtlUshortByteSwap	318	fastcall
Kernel/RtlWalkFrameChain	319	stdcall
Kernel/RtlZeroMemory	320	stdcall
Kernel/XboxEEPROMKey	321	stdcall	Variable?
Kernel/XboxHardwareInfo	322	stdcall	Variable?
Kernel/XboxHDKey	323	stdcall	Variable?
Kernel/XboxKrnlVersion	324	stdcall	Variable?
Kernel/XboxSignatureKey	325	stdcall	Variable?
Kernel/XeImageFileName	326	stdcall	Variable?
Kernel/XeLoadSection	327	stdcall
Kernel/XeUnloadSection	328	stdcall
Kernel/READ_PORT_BUFFER_UCHAR	329	stdcall
Kernel/READ_PORT_BUFFER_USHORT	330	stdcall
Kernel/READ_PORT_BUFFER_ULONG	331	stdcall
Kernel/WRITE_PORT_BUFFER_UCHAR	332	stdcall
Kernel/WRITE_PORT_BUFFER_USHORT	333	stdcall
Kernel/WRITE_PORT_BUFFER_ULONG	334	stdcall
Kernel/XcSHAInit	335	stdcall
Kernel/XcSHAUpdate	336	stdcall
Kernel/XcSHAFinal	337	stdcall
Kernel/XcRC4Key	338	stdcall
Kernel/XcRC4Crypt	339	stdcall
Kernel/XcHMAC	340	stdcall
Kernel/XcPKEncPublic	341	stdcall
Kernel/XcPKDecPrivate	342	stdcall
Kernel/XcPKGetKeyLen	343	stdcall
Kernel/XcVerifyPKCS1Signature	344	stdcall
Kernel/XcModExp	345	stdcall
Kernel/XcDESKeyParity	346	stdcall
Kernel/XcKeyTable	347	stdcall
Kernel/XcBlockCrypt	348	stdcall
Kernel/XcBlockCryptCBC	349	stdcall
Kernel/XcCryptService	350	stdcall
Kernel/XcUpdateCrypto	351	stdcall
Kernel/RtlRip	352	stdcall
Kernel/XboxLANKey	353	stdcall
Kernel/XboxAlternateSignatureKeys	354	stdcall	Variable?
Kernel/XePublicKeyData	355	stdcall	Variable?
Kernel/HalBootSMCVideoMode	356	stdcall	Variable?
Kernel/IdexChannelObject	357	stdcall	Variable?
Kernel/HalIsResetOrShutdownPending	358	stdcall
Kernel/IoMarkIrpMustComplete	359	stdcall
Kernel/HalInitiateShutdown	360	stdcall
Kernel/RtlSnprintf	361	stdcall	Unused?
Kernel/RtlSprintf	362	stdcall	Unused?
Kernel/RtlVsnprintf	363	stdcall	Unused?
Kernel/RtlVsprintf	364	stdcall	Unused?
Kernel/HalEnableSecureTrayEject	365	stdcall
Kernel/HalWriteSMCScratchRegister	366	stdcall
	367		Unused?
	368		Unused?
	369		Unused?
	370		Unused?
	371		Unused?
	372		Unused?
	373		Unused?
Kernel/MmDbgAllocateMemory	374	stdcall	Devkits only!
Kernel/MmDbgFreeMemory	375	stdcall	Devkits only!
Kernel/MmDbgQueryAvailablePages	376	stdcall	Devkits only!
Kernel/MmDbgReleaseAddress	377	stdcall	Devkits only!
Kernel/MmDbgWriteCheck	378	stdcall	Devkits only!

See Also

Hard Drive Files