List of DevHlp Functions

DevHlp function names with request code

Function Name	Code	Description	Notes
DevHlp_SchedClock	0x0	Called each timer tick
DevHlp_DevDone	0x1	Device I/O complete
DevHlp_Yield	0x2	Yield CPU if resched set
DevHlp_TCYield	0x3	Yield to time critical task
DevHlp_ProcBlock	0x4	Block on event
DevHlp_ProcRun	0x5	Unblock process
DevHlp_SemRequest	0x6	Claim a semaphore
DevHlp_SemClear	0x7	Release a semaphore
DevHlp_SemHandle	0x8	Obtain a semaphore handle
DevHlp_PushRequest	0x9	Push the request
DevHlp_PullRequest	0xA	Pull next request from Q
DevHlp_PullParticular	0xB	Pull a specific request
DevHlp_SortRequest	0xC	Push request in sorted order
DevHlp_AllocReqPacket	0xD	Allocate request packet
DevHlp_FreeReqPacket	0xE	free request packet
DevHlp_QueueInit	0xF	Init/Clear char queue
DevHlp_QueueFlush	0x10	flush queue
DevHlp_QueueWrite	0x11	Put a char in the queue
DevHlp_QueueRead	0x12	Get a char from the queue
DevHlp_Lock	0x13	Lock segment
DevHlp_Unlock	0x14	Unlock segment
DevHlp_PhysToVirt	0x15	Convert physical address to virtual
DevHlp_VirtToPhys	0x16	Convert virtual address to physical
DevHlp_PhysToUVirt	0x17	Convert physical to LDT
DevHlp_AllocPhys	0x18	Allocate physical memory
DevHlp_FreePhys	0x19	Free physical memory
DevHlp_SetROMVector	0x1A	Set a ROM service routine vector
DevHlp_SetIRQ	0x1B	Set an IRQ interrupt
DevHlp_UnSetIRQ	0x1C	Unset an IRQ interrupt
DevHlp_SetTimer	0x1D	Set timer request handler
DevHlp_ResetTimer	0x1E	Unset timer request handler
DevHlp_MonitorCreate	0x1F	Create a monitor
DevHlp_Register	0x20	Install a monitor
DevHlp_DeRegister	0x21	Remove a monitor
DevHlp_MonWrite	0x22	pass data records to monitor
DevHlp_MonFlush	0x23	remove all data from stream
DevHlp_GetDOSVar	0x24	Return pointer to DOS variable
DevHlp_SendEvent	0x25	an event occurred
DevHlp_ROMCritSection	0x26	ROM Critical Section
DevHlp_VerifyAccess	0x27	Verify access to memory
DevHlp_RAS	0x28	Put info in RAS trace buffer
DevHlp_ABIOSGetParms	0x29	Get ABIOS Calling Parameters
DevHlp_AttachDD	0x2A	Attach to a device driver
DevHlp_InternalError	0x2B	Signal an internal error
DevHlp_ModifyPriority	0x2C	Undocumented (used by PM)
DevHlp_AllocGDTSelector	0x2D	Allocate GDT Selectors
DevHlp_PhysToGDTSelector	0x2E	Convert physical address to GDT selector
DevHlp_RealToProt	0x2F	Change from real to protected mode
DevHlp_ProtToReal	0x30	Change from protected to real mode
DevHlp_EOI	0x31	Send EOI to PIC
DevHlp_UnPhysToVirt	0x32	Mark completion of PhysToVirt
DevHlp_TickCount	0x33	Modify timer
DevHlp_GetLIDEntry	0x34	Obtain Logical ID
DevHlp_FreeLIDEntry	0x35	Release Logical ID
DevHlp_ABIOSCall	0x36	Call ABIOS
DevHlp_ABIOSCommonEntry	0x37	Invoke Common Entry Point
DevHlp_GetDeviceBlock	0x38	Get ABIOS Device Block
DevHlp_RegisterStackUsag	0x3A	Register for stack usage
DevHlp_LogEntry	0x3B	Place data in log buffer
DevHlp_VideoPause	0x3C	Video pause on/off
DevHlp_Save_Message	0x3D	Save message in SysInit Message Table
DevHlp_SegRealloc	0x3E	Realloc DD protect mode segment
DevHlp_PutWaitingQueue	0x3F	Put I/O request on waiting queue
DevHlp_GetWaitingQueue	0x40	Get I/O request from waiting queue
DevHlp_PhysToSys	0x41	Address conversion for the AOX
DevHlp_PhysToSysHook	0x42	Address conversion for the AOX
DevHlp_RegisterDeviceClass	0x43	Register DC entry point
DevHlp_Sec	0x44	Register Security table
DevHlp_PerfSysTrace	0x45	Put info in performance trace buffer
DevHlp_RegisterPDD	0x50	Register PDD entry point with VDM manager for later PDD-VDD communication
DevHlp_RegisterBeep	0x51	register PTD beep service entry point with kernel
DevHlp_Beep	0x52	preempt beep service via PTD
DevHlp_FreeGDTSelector	0x53	Free allocated GDT selector
DevHlp_PhysToGDTSel	0x54	Convert Phys Addr to GDT sel with given access
DevHlp_VMLock	0x55	Lock linear address range
DevHlp_VMUnlock	0x56	Unlock address range
DevHlp_VMAlloc	0x56	Allocate memory
DevHlp_VMFree	0x58	Free memory or mapping
DevHlp_VMProcessToGlobal	0x59	Create global mapping to process memory
DevHlp_VMGlobalToProcess	0x5A	Create process mapping to global memory
DevHlp_VirtToLin	0x5B	Convert virtual address to linear
DevHlp_LinToGDTSelector	0x5C	Convert linear address to virtual
DevHlp_GetDescInfo	0x5D	Return descriptor information
DevHlp_LinToPageList	0x5E	build pagelist array from linear address
DevHlp_PageListToLin	0x5F	map page list array to linear address
DevHlp_PageListToGDTSelector	0x60	map page list array to GDT selector
DevHlp_RegisterTmrDD	0x61	Register TMR Device Driver
DevHlp_RegisterPerfCtrs	0x62	Register device driver perf. ctrs (PVW)
DevHlp_AllocateCtxHook	0x63	Allocate a context hook
DevHlp_FreeCtxHook	0x64	Free a context hook
DevHlp_ArmCtxHook	0x65	Arm a context hook
DevHlp_VMSetMem	0x66	commit/decommit memory
DevHlp_OpenEventSem	0x67	Open an event semaphore
DevHlp_CloseEventSem	0x68	Close an event semaphore
DevHlp_PostEventSem	0x69	post an event semaphore
DevHlp_ResetEventSem	0x6A	Reset an event semaphore
DevHlp_RegisterFreq	0x6B	Register PTD freq service entry point with kernel
DevHlp_DynamicAPI	0x6C	Add a dynamic API
DevHlp_ProcRun2	0x6D	Unblock process via procrun2
DevHlp_CreateInt13VDM	0x6E	Create Int13 VDM (Internal Only) OEMINT13
DevHlp_RegisterKrnlExit	0x6F	Used to capture Kernel Exits F78693
DevHlp_PMPostEventSem	0x70	PM Post Event Semaphore
DevHlp_AcquireSpinLock	0x71	acquire Spin Lock	SMP only
DevHlp_ReleaseSpinLock	0x72	release Spin Lock	SMP only
DevHlp_InitIntMouseCursorData	0x73	Initialize Mouse/Cursor Data	SMP only
DevHlp_StartIntMouseCursor	0x74	Start Int Time Mouse/Cursor	SMP only
DevHlp_EndIntMouseCursor	0x75	End Int Time Mouse/Cursor	SMP only
DevHlp_Port_IO	0x76	Port I/O	SMP only
DevHlp_SetIRQMask	0x77	Set/Unset an IRQ Mask	SMP only
DevHlp_GetIRQMask	0x78	Retrieve an IRQ Mask state	SMP only
DevHlp_CreateSpinLock	0x79	Create Spin Lock	SMP only
DevHlp_FreeSpinLock	0x7A	Free Spin Lock	SMP only
DevHlp_KillProc	0x7D	Kill Proc
DevHlp_QSysState	0x7E	Query System State
DevHlp_OpenFile	0x7F	Ring-0 File system Write
DevHlp_CloseFile	0x80	Ring-0 File system Seek
DevHlp_ReadFile	0x81	Ring-0 File system Read
DevHlp_ReadFileAt	0x82	File system Read at (seek)
DevHlp_RegisterKDD	0x83	Register driver with kernel debugger