--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/kernel/eka/nkernsmp/x86/ncsched.cia	Mon Oct 19 15:55:17 2009 +0100
@@ -0,0 +1,624 @@
+// Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of the License "Eclipse Public License v1.0"
+// which accompanies this distribution, and is available
+// at the URL "http://www.eclipse.org/legal/epl-v10.html".
+//
+// Initial Contributors:
+// Nokia Corporation - initial contribution.
+//
+// Contributors:
+//
+// Description:
+// e32\nkernsmp\x86\ncsched.cia
+// 
+//
+
+#include <x86.h>
+#include <apic.h>
+
+// SubSchedulerLookupTable	: global data, type: TSubScheduler* [256];
+// BTraceLock				: global data, type: TSpinLock
+
+const TLinAddr TScheduler_Reschedule = (TLinAddr)&TScheduler::Reschedule;
+//const TLinAddr TheScheduler_iRescheduleNeededFlag = (TLinAddr)&TheScheduler.iRescheduleNeededFlag;
+const TLinAddr NKern_FastCounter = (TLinAddr)&NKern::FastCounter;
+const TLinAddr NKern_Lock = (TLinAddr)&NKern::Lock;
+const TLinAddr NKern_Unlock = (TLinAddr)&NKern::Unlock;
+const TLinAddr addressof_TheScheduler = (TLinAddr)&TheScheduler;
+const TUint32 new_thread_trace_header = ((8<<BTrace::ESizeIndex) + (BTrace::EContextIdPresent<<BTrace::EFlagsIndex*8) + (BTrace::ECpuUsage<<BTrace::ECategoryIndex*8) + (BTrace::ENewThreadContext<<BTrace::ESubCategoryIndex*8));
+
+extern "C" void __fastcall queue_dfcs(TSubScheduler* aS);
+extern "C" NThreadBase* __fastcall select_next_thread(TSubScheduler* aS);
+extern "C" void send_resched_ipis(TUint32 aMask);
+extern "C" void __fastcall do_forced_exit(NThreadBase* aT);
+extern "C" void NewThreadTrace(NThread* a);
+
+
+/***************************************************************************
+* Reschedule
+* Enter with:
+*		Kernel locked, interrupts enabled or disabled
+* Return with:
+*		Kernel unlocked, interrupts disabled
+*		EAX=0 if no reschedule occurred, 1 if it did
+*		ESI pointing to TSubScheduler for current CPU
+*		EDI pointing to current NThread
+***************************************************************************/
+__NAKED__ void TScheduler::Reschedule()
+	{
+	asm("push 0 ");
+	asm("mov eax, ds:[%0]" : : "i" (X86_LOCAL_APIC_BASE + X86_LOCAL_APIC_OFFSET_ID));	// OK since kernel locked
+	asm("mov edi, %0" : : "i" (addressof_TheScheduler));
+	asm("shr eax, 24 ");
+	asm("mov esi, [eax*4+%0]" : : "i" (&SubSchedulerLookupTable));
+	asm("cli ");
+	asm("start_resched: ");
+//	_asm cmp dword ptr [esi]TSubScheduler.iRescheduleNeededFlag, 10000h		VC6 ignores the "dword ptr"
+	asm("lea eax, [esi+%0]" : : "i" _FOFF(TSubScheduler, iRescheduleNeededFlag));
+	asm("cmp dword ptr [eax], 0x10000 ");
+	asm("jb short resched_no_dfcs ");
+	asm("mov ecx, esi ");
+	asm("call %a0" : : "i" (&queue_dfcs));
+	asm("resched_no_dfcs: ");
+	asm("cmp byte ptr [esi+%0], 0" : : "i" _FOFF(TSubScheduler,iRescheduleNeededFlag));
+	asm("jz resched_not_needed ");
+	asm("sti ");
+	asm("mov dword ptr [esp], 1 ");
+	asm("mov ebp, [esi+%0]" : : "i"_FOFF(TSubScheduler, iCurrentThread));		// EBP -> original thread
+	asm("mov eax, cr0");
+	asm("push eax");
+	asm("mov [ebp+%0], esp" : : "i" _FOFF(NThreadBase, iSavedSP));			// Save original thread stack pointer
+
+	// We must move to a temporary stack before selecting the next thread.
+	// This is because another CPU may begin executing this thread before the
+	// select_next_thread() function returns and our stack would then be
+	// corrupted. We use the stack belonging to this CPU's initial thread since
+	// we are guaranteed that will never run on another CPU.
+	asm("mov ecx, [esi+%0]" : : "i" _FOFF(TSubScheduler, iInitialThread));
+	asm("mov esp, [ecx+%0]" : : "i" _FOFF(NThreadBase, iSavedSP));
+
+	asm("select_thread:");
+	asm("mov ecx, esi ");
+	asm("call %a0" : : "i" (&select_next_thread));
+	asm("mov ebx, eax ");
+	asm("cmp ebx, 0 ");
+	asm("jz no_thread ");
+	asm("mov esp, [ebx+%0]" : : "i" _FOFF(NThreadBase, iSavedSP)); // move to new thread's stack
+
+#ifdef BTRACE_CPU_USAGE
+	asm("cmp byte ptr %a0, 0" : : "i" (&BTraceData.iFilter[4]));
+	asm("jz short no_trace ");
+	asm("push ebx ");
+	asm("call %a0" : : "i" (NewThreadTrace));
+	asm("pop ebx ");
+	asm("no_trace: ");
+#endif	// BTRACE_CPU_USAGE
+
+	asm("cmp ebp, ebx ");
+	asm("je same_thread ");
+	asm("mov eax, [ebx+%0]" : : "i" _FOFF(NThreadBase, iStackBase));
+	asm("add eax, [ebx+%0]" : : "i" _FOFF(NThreadBase, iStackSize));
+	asm("mov ecx, [esi+60+%0]" : : "i" _FOFF(TSubScheduler, iExtras));		// iExtras[15] points to TSS
+	asm("mov [ecx+%0], eax" : : "i" _FOFF(TX86Tss, iEsp0));					// set ESP0 to top of new thread supervisor stack
+
+	asm("test byte ptr [ebx+%0], 2" : : "i" _FOFF(NThreadBase,i_ThrdAttr));	// test for address space switch
+	asm("jz short resched_no_as_switch ");
+	asm("call [edi+%0]" : : "i" _FOFF(TScheduler, iProcessHandler));		// call handler with
+														// EBX=pointer to new thread, EDI->scheduler, ESI->subscheduler
+	asm("resched_no_as_switch: ");
+	asm("same_thread: ");
+	asm("pop eax ");
+	asm("mov cr0, eax ");
+	asm("cli ");
+//	asm("cmp dword ptr [esi]TSubScheduler.iRescheduleNeededFlag, 0	VC6 ignores the "dword ptr"
+	asm("lea eax, [esi+%0]" : : "i" _FOFF(TSubScheduler, iRescheduleNeededFlag));
+	asm("cmp dword ptr [eax], 0 ");
+	asm("jnz start_resched ");
+
+	asm("resched_not_needed: ");
+	asm("mov edi, [esi+%0]" : : "i" _FOFF(TSubScheduler, iCurrentThread));
+	asm("cmp dword ptr [edi+%0], -3" : : "i" _FOFF(NThreadBase, iCsFunction)); // ECSDivertPending
+	asm("je resched_thread_divert ");
+	asm("mov dword ptr [esi+%0], 0" : : "i" _FOFF(TSubScheduler, iKernLockCount));
+	asm("pop eax ");
+	asm("ret ");
+
+	asm("resched_thread_divert: ");
+	asm("push edi ");
+	asm("xor eax, eax ");
+	asm("lock xchg eax, [esi+%0]" : : "i" _FOFF(TSubScheduler, iReschedIPIs));
+	asm("test eax, eax ");
+	asm("jz short no_resched_ipis ");
+	asm("push eax ");
+	asm("call %a0" : : "i" (&send_resched_ipis));
+	asm("add esp, 4 ");
+	asm("no_resched_ipis: ");
+
+	asm("sti ");
+	asm("mov ecx, [esp+12] ");			// SThreadReschedStack iReason 0 not run 1 unlock 2 IRQ
+	asm("cmp ecx, 2 ");
+	asm("ja short rtd_unknown ");		// unknown - die
+	asm("shl ecx, 2 ");					// reason * 4
+	asm("mov eax, 0xa1a ");
+	asm("shr eax, cl ");
+	asm("and eax, 15 ");
+	asm("mov gs, [esp+eax*4+16] ");		// restore GS
+
+	asm("pop ecx ");					// exiting thread pointer
+	asm("call %a0" : : "i" (&do_forced_exit));
+	asm("int 0xff ");					// should never get here
+
+	asm("rtd_unknown: ");
+	asm("int 0xff ");					// should never get here
+
+
+	// There is no thread ready to run
+	asm("no_thread: ");
+	asm("cli ");
+	asm("xor eax, eax ");
+	asm("lock xchg eax, [esi+%0]" : : "i" _FOFF(TSubScheduler, iReschedIPIs));
+	asm("test eax, eax ");
+	asm("jz short no_resched_ipis2 ");
+	asm("push eax ");
+	asm("call %a0" : : "i" (&send_resched_ipis));
+	asm("add esp, 4 ");
+	asm("no_resched_ipis2: ");
+	asm("sti ");
+	asm("hlt ");
+	asm("no_thread2: ");
+//	_asm cmp dword ptr [esi]TSubScheduler.iRescheduleNeededFlag, 10000h		VC6 ignores the "dword ptr"
+	asm("lea eax, [esi+%0]" : : "i" _FOFF(TSubScheduler, iRescheduleNeededFlag));
+	asm("cmp dword ptr [eax], 0x10000 ");
+	asm("jb short no_thread ");
+	asm("mov ecx, esi ");
+	asm("call %a0" : : "i" (&queue_dfcs));
+	asm("cmp byte ptr [esi+%0], 0" : : "i" _FOFF(TSubScheduler, iRescheduleNeededFlag));
+	asm("jz short no_thread2 ");
+	asm("jmp select_thread ");
+	}
+
+
+/** Disable interrupts to the specified level
+
+If aLevel = 0 does not affect interrupt state
+If aLevel <>0 disables all maskable interrupts.
+
+@param	aLevel level to which to disable
+@return	Cookie to pass into RestoreInterrupts()
+*/
+EXPORT_C __NAKED__ TInt NKern::DisableInterrupts(TInt /*aLevel*/)
+	{
+	asm("pushfd");
+	asm("mov ecx, [esp+4]");
+	asm("pop eax");
+	asm("and eax, 0x200");
+	asm("test ecx, ecx");
+	asm("jz disable_ints_0");
+	asm("cli");
+	asm("disable_ints_0:");
+	asm("ret");
+	}
+
+
+/** Disable all maskable interrupts
+
+@return	Cookie to pass into RestoreInterrupts()
+*/
+EXPORT_C __NAKED__ TInt NKern::DisableAllInterrupts()
+	{
+	asm("pushfd");
+	asm("pop eax");
+	asm("and eax, 0x200");
+	asm("cli");
+	asm("ret");
+	}
+
+
+/** Restore interrupt mask to state preceding a DisableInterrupts() call
+
+@param	aLevel Cookie returned by Disable(All)Interrupts()
+*/
+EXPORT_C __NAKED__ void NKern::RestoreInterrupts(TInt aLevel)
+	{
+	asm("test byte ptr [esp+5], 2");	// test saved I flag
+	asm("jz restore_irq_off");			// jump if clear
+	asm("sti");							// else reenable interrupts
+	asm("ret");
+	asm("restore_irq_off:");
+	asm("cli");
+	asm("ret");
+	}
+
+
+/** Enable all maskable interrupts
+
+@internalComponent
+*/
+EXPORT_C __NAKED__ void NKern::EnableAllInterrupts()
+	{
+	asm("sti");
+	asm("ret");
+	}
+
+
+/**	Unlocks the kernel
+	Decrements iKernCSLocked; if it becomes zero and IDFCs or a reschedule are
+	pending, calls the scheduler to process them.
+
+	@pre	Thread or IDFC context. Don't call from ISRs.
+ */
+EXPORT_C __NAKED__ void NKern::Unlock()
+	{
+	asm("mov eax, ds:[%0]" : : "i" (X86_LOCAL_APIC_BASE + X86_LOCAL_APIC_OFFSET_ID)); // OK since kernel locked
+	asm("shr eax, 24 ");
+	asm("push esi ");
+	asm("mov esi, [eax*4+%0]" : : "i" (&SubSchedulerLookupTable));
+#ifdef _DEBUG
+	asm("cmp dword ptr [esi+%0], 0" : : "i" _FOFF(TSubScheduler, iKernLockCount));
+	asm("jg short _dbg1 ");
+	asm("int 0xff ");
+	asm("_dbg1: ");
+#endif
+	asm("cli ");
+	asm("dec dword ptr [esi+%0]" : : "i" _FOFF(TSubScheduler, iKernLockCount));
+	asm("jnz short still_locked ");
+//	asm("cmp dword ptr [esi]TSubScheduler.iRescheduleNeededFlag, 0	VC6 ignores the "dword ptr"
+	asm("lea eax, [esi+%0]" : : "i" _FOFF(TSubScheduler, iRescheduleNeededFlag));
+	asm("cmp dword ptr [eax], 0 ");
+	asm("jz short no_resched ");
+
+	asm("mov dword ptr [esi+%0], 1" : : "i" _FOFF(TSubScheduler, iKernLockCount));
+	asm("push edi ");
+	asm("push ebp ");
+	asm("push ebx ");
+	asm("push gs ");
+	asm("push fs ");
+	asm("sti ");
+
+	// Reschedule - return with local interrupts disabled, iKernLockCount=0
+	asm("push 1 ");
+	asm("call %a0" : : "i" (TScheduler_Reschedule));
+	asm("add esp, 4 ");
+
+	asm("xor eax, eax ");
+	asm("lock xchg eax, [esi+%0]" : : "i" _FOFF(TSubScheduler, iReschedIPIs));
+	asm("test eax, eax ");
+	asm("jz short no_resched_ipis_ul ");
+
+	asm("unlock_do_resched_ipis: ");
+	asm("push eax ");
+	asm("call %a0" : : "i" (&send_resched_ipis));
+	asm("add esp, 4 ");
+
+	asm("no_resched_ipis_ul: ");
+	asm("pop fs ");
+	asm("pop gs ");
+	asm("pop ebx ");
+	asm("pop ebp ");
+	asm("pop edi ");
+
+	asm("still_locked: ");
+	asm("sti ");
+	asm("pop esi ");
+	asm("ret ");
+
+	asm("no_resched: ");
+	asm("xor eax, eax ");
+	asm("lock xchg eax, [esi+%0]" : : "i" _FOFF(TSubScheduler, iReschedIPIs));
+	asm("test eax, eax ");
+	asm("jz short still_locked ");
+	asm("push edi ");
+	asm("push ebp ");
+	asm("push ebx ");
+	asm("push gs ");
+	asm("push fs ");
+	asm("jmp short unlock_do_resched_ipis ");
+	}
+
+
+/**	Locks the kernel
+	Defer IDFCs and preemption
+
+	@pre	Thread or IDFC context. Don't call from ISRs.
+ */
+EXPORT_C __NAKED__ void NKern::Lock()
+	{
+	asm("cli");		// stop thread migration between reading APIC ID and subscheduler stuff
+	asm("mov eax, ds:[%0]" : : "i"(X86_LOCAL_APIC_BASE + X86_LOCAL_APIC_OFFSET_ID));
+	asm("shr eax, 24");
+	asm("mov ecx, [eax*4+%0]" : : "i"(&SubSchedulerLookupTable));
+	asm("inc dword ptr [ecx+%0]": : "i"_FOFF(TSubScheduler, iKernLockCount));
+	asm("sti");
+	asm("ret");
+	}
+
+
+/**	Locks the kernel and returns a pointer to the current thread
+	Defer IDFCs and preemption
+
+	@pre	Thread or IDFC context. Don't call from ISRs.
+ */
+EXPORT_C __NAKED__ NThread* NKern::LockC()
+	{
+	asm("cli");		// stop thread migration between reading APIC ID and subscheduler stuff
+	asm("mov eax, ds:[%0]" : : "i"(X86_LOCAL_APIC_BASE + X86_LOCAL_APIC_OFFSET_ID));
+	asm("shr eax, 24");
+	asm("mov ecx, [eax*4+%0]" : : "i"(&SubSchedulerLookupTable));
+	asm("inc dword ptr [ecx+%0]": : "i"_FOFF(TSubScheduler, iKernLockCount));
+	asm("mov eax, [ecx+%0]" : : "i"_FOFF(TSubScheduler, iCurrentThread));
+	asm("sti");
+	asm("ret");
+	}
+
+
+/**	Allows IDFCs and rescheduling if they are pending.
+	If IDFCs or a reschedule are pending and iKernCSLocked is exactly equal to 1
+	calls the scheduler to process the IDFCs and possibly reschedule.
+
+	@return	Nonzero if a reschedule actually occurred, zero if not.
+	@pre	Thread or IDFC context. Don't call from ISRs.
+ */
+EXPORT_C __NAKED__ TInt NKern::PreemptionPoint()
+	{
+	asm("mov eax, ds:[%0]" : : "i"(X86_LOCAL_APIC_BASE + X86_LOCAL_APIC_OFFSET_ID));
+	asm("shr eax, 24");
+	asm("mov ecx, [eax*4+%0]" : : "i"(&SubSchedulerLookupTable));
+#ifdef _DEBUG
+	asm("cmp dword ptr [ecx+%0], 0": : "i"_FOFF(TSubScheduler, iKernLockCount));
+	asm("jg _dbg1_pp");
+	asm("int 0xff");
+	asm("_dbg1_pp:");
+#endif
+	asm("cmp dword ptr [ecx+%0], 1": : "i"_FOFF(TSubScheduler, iKernLockCount));
+	asm("jnz still_locked_pp");
+//	asm("cmp dword ptr [ecx]TSubScheduler.iRescheduleNeededFlag, 0		VC6 ignores the "dword ptr"
+	asm("lea eax, [ecx+%0]": : "i"_FOFF(TSubScheduler, iRescheduleNeededFlag));
+	asm("cmp dword ptr [eax], 0");
+	asm("jnz do_resched");
+	asm("cli");
+	asm("lock xchg eax, [ecx+%0]": : "i"_FOFF(TSubScheduler, iReschedIPIs));
+	asm("test eax, eax");
+	asm("jz pp_no_resched_ipis");
+	asm("push eax");
+	asm("call %a0": :"i"(&send_resched_ipis));
+	asm("add esp, 4");
+	asm("pp_no_resched_ipis:");
+	asm("sti");
+
+	asm("still_locked_pp:");
+	asm("xor eax, eax");
+	asm("ret");
+
+	asm("do_resched:");
+	asm("call %a0" : : "i"(NKern_Unlock));
+	asm("call %a0" : : "i"(NKern_Lock));
+	asm("mov eax, 1");
+	asm("ret");
+	}
+
+
+/** Complete the saving of a thread's context
+
+This saves the FPU registers if necessary once we know that we are definitely
+switching threads.
+
+@internalComponent
+*/
+__NAKED__ void NThread::CompleteContextSave()
+	{
+	THISCALL_PROLOG0()
+	asm("mov edx, [ecx+%0]": : "i"_FOFF(NThreadBase,iSavedSP));	// EDX points to saved state on thread stack
+	asm("test byte ptr [edx], 8");						// test thread's saved TS flag
+	asm("jnz no_fpu");									// if set, thread did not use FPU
+	asm("clts");
+	asm("fnsave [ecx+%0]": : "i"_FOFF(NThread, iCoprocessorState));	// else thread did use FPU - save its state
+	asm("or byte ptr [edx], 8");						// set TS flag so thread aborts next time it uses FPU
+	asm("fwait");
+
+	asm("no_fpu:");
+	THISCALL_EPILOG0()
+	}
+
+
+/** Check if the kernel is locked the specified number of times.
+
+	@param aCount	The number of times the kernel should be locked
+					If zero, tests if it is locked at all
+	@return TRUE if the tested condition is true.
+
+	@internalTechnology
+*/
+EXPORT_C __NAKED__ TBool NKern::KernelLocked(TInt /*aCount*/)
+	{
+	asm("pushfd");
+	asm("cli");
+	asm("mov eax, ds:[%0]" : : "i"(X86_LOCAL_APIC_BASE + X86_LOCAL_APIC_OFFSET_ID));
+	asm("shr eax, 24");
+	asm("mov eax, [eax*4+%0]" : : "i"(&SubSchedulerLookupTable));
+	asm("mov edx, [eax+%0]": : "i"_FOFF(TSubScheduler, iKernLockCount));
+	asm("popfd");
+	asm("cmp edx, 0");
+	asm("jz not_locked");
+	asm("mov eax, [esp+4]");
+	asm("cmp eax, 0");
+	asm("jz locked");
+	asm("cmp eax, edx");
+	asm("jnz not_locked");
+	asm("locked:");
+	asm("mov eax, 1");
+	asm("ret");
+	asm("not_locked:");
+	asm("xor eax, eax");
+	asm("ret");
+	}
+
+
+// Only call this if thread migration is disabled, i.e.
+// interrupts disabled, kernel locked or current thread in 'freeze cpu' mode
+extern "C" __NAKED__ TSubScheduler& SubScheduler()
+	{
+	asm("mov eax, ds:[%0]" : : "i"(X86_LOCAL_APIC_BASE + X86_LOCAL_APIC_OFFSET_ID));
+	asm("shr eax, 24");
+	asm("mov eax, [eax*4+%0]" : : "i"(&SubSchedulerLookupTable));
+	asm("ret");
+	}
+
+/** Returns the NThread control block for the currently scheduled thread.
+
+    Note that this is the calling thread if called from a thread context, or the
+	interrupted thread if called from an interrupt context.
+	
+	@return A pointer to the NThread for the currently scheduled thread.
+	
+	@pre Call in any context.
+*/
+EXPORT_C __NAKED__ NThread* NKern::CurrentThread()
+	{
+	asm("pushfd");
+	asm("cli");		// stop thread migration between reading APIC ID and thread pointer
+	asm("mov eax, ds:[%0]" : : "i"(X86_LOCAL_APIC_BASE + X86_LOCAL_APIC_OFFSET_ID));
+	asm("shr eax, 24");
+	asm("mov eax, [eax*4+%0]" : : "i"(&SubSchedulerLookupTable));
+	asm("cmp eax, 0");
+	asm("jz done");
+	asm("test al, 3");
+	asm("jnz bad_ct");
+	asm("mov eax, [eax+%0]": : "i"_FOFF(TSubScheduler, iCurrentThread));
+	asm("done:");
+	asm("popfd");
+	asm("ret");
+	asm("bad_ct:");
+	asm("popfd");
+	asm("xor eax, eax");
+	asm("ret");
+	}
+
+
+/** Returns the NThread control block for the currently scheduled thread.
+
+    Note that this is the calling thread if called from a thread context, or the
+	interrupted thread if called from an interrupt context.
+	
+	@return A pointer to the NThread for the currently scheduled thread.
+	
+	@pre Call with migration disabled - i.e. from an ISR, IDFC, with interrupts
+			disabled or with preemption disabled.
+*/
+extern "C" __NAKED__ NThread* NCurrentThreadL()
+	{
+	asm("mov eax, ds:[%0]" : : "i"(X86_LOCAL_APIC_BASE + X86_LOCAL_APIC_OFFSET_ID));
+	asm("shr eax, 24");
+	asm("mov eax, [eax*4+%0]" : : "i"(&SubSchedulerLookupTable));
+	asm("mov eax, [eax+%0]": : "i"_FOFF(TSubScheduler, iCurrentThread));
+	asm("ret");
+	}
+
+
+/** Returns the CPU number of the calling CPU.
+
+	@return the CPU number of the calling CPU.
+	
+	@pre Call in any context.
+*/
+EXPORT_C __NAKED__ TInt NKern::CurrentCpu()
+	{
+	asm("xor eax, eax");
+	asm("str ax");
+	asm("sub al, 0x28");
+	asm("shr al, 3");
+	asm("ret");
+	}
+
+
+/**	Return the current processor context type (thread, IDFC or interrupt)
+
+	@return	A value from NKern::TContext enumeration (but never EEscaped)
+	@pre	Any context
+
+	@see	NKern::TContext
+ */
+EXPORT_C __NAKED__ TInt NKern::CurrentContext()
+	{
+	asm("pushfd");
+	asm("cli");		// stop thread migration between reading APIC ID and subscheduler stuff
+	asm("mov edx, ds:[%0]": :"i"(X86_LOCAL_APIC_BASE + X86_LOCAL_APIC_OFFSET_ID));
+	asm("xor eax, eax");
+	asm("shr edx, 24");
+	asm("mov edx, [edx*4+%0]" : : "i"(&SubSchedulerLookupTable));
+	asm("cmp edx, eax");
+	asm("jz bad_cc");
+	asm("test dl, 3");
+	asm("jnz bad_cc");
+	asm("cmp eax, [edx+52+%0]": : "i"_FOFF(TSubScheduler,iExtras)); // i_IrqNestCount
+	asm("jle irq");
+	asm("cmp al, [edx+%0]": : "i"_FOFF(TSubScheduler, iInIDFC));
+	asm("jz thread");
+	asm("jmp idfc");
+
+	asm("bad_cc:");			// no subscheduler yet [initialising] - return EInterrupt
+	asm("irq:");			// return NKern::EInterrupt [=2]
+	asm("inc eax");
+	asm("idfc:");			// return NKern::EIDFC [=1]
+	asm("inc eax");
+	asm("thread:");			// return NKern::EThread [=0]
+	asm("popfd");
+	asm("ret");
+	}
+
+
+#ifdef __USE_LOGICAL_DEST_MODE__
+extern "C" __NAKED__ void __fastcall do_send_resched_ipis(TUint32)
+	{
+	asm("shl ecx, 24 ");		// CPUs mask into bits 24-31
+	asm("jz short sri0 ");		// no CPUs, so nothing to do
+	asm("pushfd ");
+	asm("cli ");
+	asm("mov ds:[%0], ecx" : : "i" (X86_LOCAL_APIC_BASE + X86_LOCAL_APIC_OFFSET_ICRH));
+	asm("mov eax, %0" : : "i" (RESCHED_IPI_VECTOR | 0x4800));
+	asm("mov ds:[%0], eax" : : "i" (X86_LOCAL_APIC_BASE + X86_LOCAL_APIC_OFFSET_ICRL));
+	asm("popfd ");
+	asm("sri0: ");
+	asm("ret ");
+	}
+#endif
+
+extern "C" __NAKED__ void __fastcall send_ipi(TUint32)
+	{
+	asm("pushfd ");
+	asm("cli ");
+	asm("mov ds:[%0], ecx" : : "i" (X86_LOCAL_APIC_BASE + X86_LOCAL_APIC_OFFSET_ICRH));
+	asm("mov eax, %0" : : "i" (RESCHED_IPI_VECTOR | 0x4000));
+	asm("mov ds:[%0], eax" : : "i" (X86_LOCAL_APIC_BASE + X86_LOCAL_APIC_OFFSET_ICRL));
+	asm("popfd ");
+	asm("ret ");
+	}
+
+// Send a reschedule IPI to the current processor
+// *** DON'T DO ANY TRACING OR INSTRUMENTATION ***
+extern "C" __NAKED__ void send_self_resched_ipi()
+	{
+	asm("pushfd ");
+	asm("cli ");
+	asm("xor ecx, ecx ");
+	asm("mov ds:[%0], ecx" : : "i" (X86_LOCAL_APIC_BASE + X86_LOCAL_APIC_OFFSET_ICRH));
+	asm("mov eax, %0" : : "i" (RESCHED_IPI_VECTOR | 0x44000));	// destination shorthand = self
+	asm("mov ds:[%0], eax" : : "i" (X86_LOCAL_APIC_BASE + X86_LOCAL_APIC_OFFSET_ICRL));
+	asm("popfd ");
+	asm("ret ");
+	}
+
+extern "C" __NAKED__ void send_irq_ipi(TSubScheduler*)
+	{
+	asm("mov ecx, [esp+4] ");
+	asm("pushfd ");
+	asm("mov edx, [ecx+%0]" : : "i" _FOFF(TSubScheduler, i_APICID));
+	asm("cli ");
+	asm("mov ds:[%0], edx" : : "i" (X86_LOCAL_APIC_BASE + X86_LOCAL_APIC_OFFSET_ICRH));
+	asm("mov eax, %0" : : "i" (TRANSFERRED_IRQ_VECTOR | 0x4000));
+	asm("mov ds:[%0], eax" : : "i" (X86_LOCAL_APIC_BASE + X86_LOCAL_APIC_OFFSET_ICRL));
+	asm("popfd ");
+	asm("ret ");
+	}
+