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- Part 2 of 2: Implement KiDispatchInterrupt in assembly since it's 1) Perf-critical 2) Requires us to switch the stack to the DPC stack, which is unsafe (and impossible, unless inlining) in C.
svn path=/trunk/; revision=23889
This commit is contained in:
Alex Ionescu
parent
0f9c7bdf03
commit
252a2d1598
3 changed files with 80 additions and 52 deletions
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@ -148,6 +148,7 @@ Author:
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#define KPCR_SET_MEMBER 0x48
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#define KPCR_NUMBER 0x51
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#define KPCR_CURRENT_THREAD 0x124
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#define KPCR_PRCB_NEXT_THREAD 0x128
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#define KPCR_PRCB_IDLE_THREAD 0x12C
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#define KPCR_PROCESSOR_NUMBER 0x130
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#define KPCR_PRCB_SET_MEMBER 0x134
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@ -165,12 +166,15 @@ Author:
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#define KPCR_SYSTEM_CALLS 0x6B8
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#define KPCR_PRCB_DPC_QUEUE_DEPTH 0xA4C
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#define KPCR_PRCB_DPC_COUNT 0xA50
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#define KPCR_PRCB_DPC_STACK 0xA68
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#define KPCR_PRCB_MAXIMUM_DPC_QUEUE_DEPTH 0xA6C
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#define KPCR_PRCB_DPC_REQUEST_RATE 0xA70
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#define KPCR_PRCB_DPC_INTERRUPT_REQUESTED 0xA78
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#define KPCR_PRCB_DPC_ROUTINE_ACTIVE 0xA7A
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#define KPCR_PRCB_DPC_LAST_COUNT 0xA80
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#define KPCR_PRCB_TIMER_REQUEST 0xA88
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#define KPCR_PRCB_QUANTUM_END 0xAA1
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#define KPCR_PRCB_DEFERRED_READY_LIST_HEAD 0xC10
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//
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// KINTERRUPT Offsets
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@ -441,9 +441,22 @@ KeFlushQueuedDpcs(VOID)
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{
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PAGED_CODE();
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/* Request an interrupt if needed */
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DPRINT1("%s - FIXME!!!\n", __FUNCTION__);
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if (KeGetCurrentPrcb()->DpcData[0].DpcQueueDepth) HalRequestSoftwareInterrupt(DISPATCH_LEVEL);
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/* Check if this is an UP machine */
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if (KeActiveProcessors == 1)
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{
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/* Check if there are DPCs on either queues */
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if ((KeGetCurrentPrcb()->DpcData[DPC_NORMAL].DpcQueueDepth) ||
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(KeGetCurrentPrcb()->DpcData[DPC_THREADED].DpcQueueDepth))
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{
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/* Request an interrupt */
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HalRequestSoftwareInterrupt(DISPATCH_LEVEL);
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}
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}
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else
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{
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/* FIXME: SMP support required */
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ASSERT(FALSE);
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}
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}
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/*
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@ -483,53 +496,4 @@ KeSetTargetProcessorDpc(IN PKDPC Dpc,
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Dpc->Number = Number + MAXIMUM_PROCESSORS;
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}
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/*
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* @implemented
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*/
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VOID
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NTAPI
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KiDispatchInterrupt(VOID)
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{
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PKIPCR Pcr = (PKIPCR)KeGetPcr();
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PVOID ExceptionList;
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/* Disable interrupts */
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Ke386DisableInterrupts();
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/* Check if we have to deliver DPCs, timers, or deferred threads */
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if ((Pcr->PrcbData.DpcData[DPC_NORMAL].DpcQueueDepth) ||
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(Pcr->PrcbData.TimerRequest) ||
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(Pcr->PrcbData.DeferredReadyListHead.Next))
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{
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/* Save the exception list and clear it */
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ExceptionList = Pcr->NtTib.ExceptionList;
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Pcr->NtTib.ExceptionList = EXCEPTION_CHAIN_END;
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/* FIXME: Switch to DPC Stack */
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/* Deliver DPCs */
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KiRetireDpcList(Pcr->Prcb);
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/* FIXME: Restore stack */
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/* Restore exception list */
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Pcr->NtTib.ExceptionList = ExceptionList;
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}
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/* Re-enable interrupts */
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Ke386EnableInterrupts();
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/* Check if we have quantum end */
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if (Pcr->PrcbData.QuantumEnd)
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{
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/* Process it */
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Pcr->PrcbData.QuantumEnd = FALSE;
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KiQuantumEnd();
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}
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else if (Pcr->PrcbData.NextThread)
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{
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/* FIXME: Schedule new thread */
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}
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}
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/* EOF */
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@ -56,6 +56,7 @@ GENERATE_IDT_STUBS /* INT 30-FF: UNEXPECTED INTERRUPTS */
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.globl _NtRaiseException@12
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.globl _NtContinue@8
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.globl _KiCoprocessorError@0
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.globl _KiDispatchInterrupt@0
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/* Interrupt template entrypoints */
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.globl _KiInterruptTemplate
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@ -1558,6 +1559,65 @@ _KiUnexpectedInterrupt:
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/* INTERRUPT HANDLERS ********************************************************/
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.func KiDispatchInterrupt@0
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_KiDispatchInterrupt@0:
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/* Get the PCR and disable interrupts */
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mov ebx, [fs:KPCR_SELF]
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cli
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/* Check if we have to deliver DPCs, timers, or deferred threads */
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mov eax, [ebx+KPCR_PRCB_DPC_QUEUE_DEPTH]
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or eax, [ebx+KPCR_PRCB_TIMER_REQUEST]
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or eax, [ebx+KPCR_PRCB_DEFERRED_READY_LIST_HEAD]
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jz CheckQuantum
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/* Save stack pointer and exception list, then clear it */
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push ebp
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push dword ptr [ebx+KPCR_EXCEPTION_LIST]
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mov dword ptr [ebx+KPCR_EXCEPTION_LIST], -1
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/* Save the stack and switch to the DPC Stack */
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mov edx, esp
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//mov esp, [ebx+KPCR_PRCB_DPC_STACK]
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push edx
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/* Deliver DPCs */
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mov ecx, [ebx+KPCR_PRCB]
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call @KiRetireDpcList@4
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/* Restore stack and exception list */
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pop esp
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pop dword ptr [ebx]
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pop ebp
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CheckQuantum:
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/* Re-enable interrupts */
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sti
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/* Check if we have quantum end */
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cmp byte ptr [ebx+KPCR_PRCB_QUANTUM_END], 0
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jnz QuantumEnd
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/* Check if we have a thread to swap to */
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cmp byte ptr [ebx+KPCR_PRCB_NEXT_THREAD], 0
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jz Return
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/* FIXME: Schedule new thread */
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int 3
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Return:
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/* All done */
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ret
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QuantumEnd:
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/* Disable quantum end and process it */
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mov byte ptr [ebx+KPCR_PRCB_QUANTUM_END], 0
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call _KiQuantumEnd@0
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ret
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.endfunc
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.func KiInterruptTemplate
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_KiInterruptTemplate:
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