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[NTOS]: Implement the idle loop in C.
svn path=/trunk/; revision=49485
This commit is contained in:
Sir Richard
parent
c3f5d851e3
commit
8a59fecfa5
2 changed files with 60 additions and 125 deletions
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@ -498,129 +498,6 @@ QuantumEnd:
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ret
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.endfunc
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.globl @KiIdleLoop@0
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.func @KiIdleLoop@0, @KiIdleLoop@0
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@KiIdleLoop@0:
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/* Set EBX */
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mov ebx, fs:[KPCR_SELF]
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/* Jump into mainline code */
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jmp MainLoop
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CpuIdle:
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/* Call the CPU's idle function */
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lea ecx, [ebx+KPCR_PRCB_POWER_STATE_IDLE_FUNCTION]
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call [ecx]
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MainLoop:
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/* Cycle interrupts for 1 cycle */
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sti
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nop
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nop
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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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#ifdef CONFIG_SMP
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or eax, [ebx+KPCR_PRCB_DEFERRED_READY_LIST_HEAD]
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#endif
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jz CheckSchedule
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mov cl, DISPATCH_LEVEL
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call @HalClearSoftwareInterrupt@4
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/* Handle the above */
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lea ecx, [ebx+KPCR_PRCB_DATA]
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call @KiRetireDpcList@4
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CheckSchedule:
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/* Check if a next thread is queued */
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cmp dword ptr [ebx+KPCR_PRCB_NEXT_THREAD], 0
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#ifdef CONFIG_SMP
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jz NoNextThread
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#else
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jz CpuIdle
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#endif
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#ifdef CONFIG_SMP
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/* There is, raise IRQL to synch level */
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call _KeRaiseIrqlToSynchLevel@0
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#endif
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sti
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/* Set the current thread to ready */
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mov edi, [ebx+KPCR_CURRENT_THREAD]
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#ifdef CONFIG_SMP
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mov byte ptr [edi+KTHREAD_SWAP_BUSY], 1
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/* Acquire the PRCB Lock */
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lock bts dword ptr [ebx+KPCR_PRCB_PRCB_LOCK], 0
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jnb CheckNext
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lea ecx, [ebx+KPCR_PRCB_PRCB_LOCK]
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call @KefAcquireSpinLockAtDpcLevel@4
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#endif
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CheckNext:
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/* Check if the next thread is the current */
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mov esi, [ebx+KPCR_PRCB_NEXT_THREAD]
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#ifdef CONFIG_SMP
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cmp esi, edi
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jz SameThread
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#endif
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/* Clear the next thread and set this one instead */
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and dword ptr [ebx+KPCR_PRCB_NEXT_THREAD], 0
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mov [ebx+KPCR_CURRENT_THREAD], esi
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/* Set the thread as running */
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mov byte ptr [esi+KTHREAD_STATE_], Running
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#ifdef CONFIG_SMP
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/* Disable the idle scheduler and release the PRCB lock */
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and byte ptr [ebx+KPCR_PRCB_IDLE_SCHEDULE], 0
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and dword ptr [ebx+KPCR_PRCB_PRCB_LOCK], 0
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#endif
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SwapContext:
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/* Swap context at APC_LEVEL */
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mov ecx, APC_LEVEL
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call @KiSwapContextInternal@0
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#ifdef CONFIG_SMP
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/* Lower to DPC level */
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mov ecx, DISPATCH_LEVEL
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call @KfLowerIrql@4
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#endif
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jmp MainLoop
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#ifdef CONFIG_SMP
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SameThread:
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/* Clear the next thread, and put the thread as ready after lock release */
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and dword ptr [ebx+KPCR_PRCB_NEXT_THREAD], 0
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and dword ptr [ebx+KPCR_PRCB_PRCB_LOCK], 0
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and byte ptr [edi+KTHREAD_STATE_], Ready
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jmp MainLoop
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NoNextThread:
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/* Check if the idle scheduler is enabled */
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cmp byte ptr [ebx+KPCR_PRCB_IDLE_SCHEDULE], 0
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jz CpuIdle
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/* It is, so call the scheduler */
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lea ecx, [ebx+KPCR_PRCB_DATA]
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call @KiIdleSchedule@4
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test eax, eax
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/* Get new thread pointers and either swap or idle loop again */
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mov esi, eax
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mov edi, [ebx+KPCR_PRCB_IDLE_THREAD]
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jnz SwapContext
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jmp MainLoop
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#endif
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.endfunc
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/* FIXFIX: Move to C code ****/
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.globl _Ki386SetupAndExitToV86Mode@4
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.func Ki386SetupAndExitToV86Mode@4
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@ -249,6 +249,64 @@ KiInitializeContextThread(IN PKTHREAD Thread,
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Thread->KernelStack = (PVOID)CtxSwitchFrame;
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}
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VOID
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FASTCALL
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KiIdleLoop(VOID)
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{
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PKPRCB Prcb = KeGetCurrentPrcb();
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PKTHREAD OldThread, NewThread;
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/* Initialize the idle loop: disable interrupts */
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_enable();
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__asm__("nop; nop");
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_disable();
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/* Now loop forever */
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while (TRUE)
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{
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/* Check for pending timers, pending DPCs, or pending ready threads */
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if ((Prcb->DpcData[0].DpcQueueDepth) ||
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(Prcb->TimerRequest) ||
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(Prcb->DeferredReadyListHead.Next))
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{
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/* Quiesce the DPC software interrupt */
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HalClearSoftwareInterrupt(DISPATCH_LEVEL);
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/* Handle it */
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KiRetireDpcList(Prcb);
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}
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/* Check if a new thread is scheduled for execution */
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if (Prcb->NextThread)
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{
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/* Enable interupts */
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_enable();
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/* Capture current thread data */
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OldThread = Prcb->CurrentThread;
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NewThread = Prcb->NextThread;
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/* Set new thread data */
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Prcb->NextThread = NULL;
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Prcb->CurrentThread = NewThread;
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/* The thread is now running */
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NewThread->State = Running;
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/* Switch away from the idle thread */
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KiSwapContext(OldThread, NewThread);
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/* We are back in the idle thread -- disable interrupts again */
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_enable();
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__asm__("nop");
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_disable();
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}
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else
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{
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/* Continue staying idle. Note the HAL returns with interrupts on */
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Prcb->PowerState.IdleFunction(&Prcb->PowerState);
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}
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}
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}
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/* EOF */
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