--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/kernel/eka/nkern/x86/vectors.cpp	Mon Oct 19 15:55:17 2009 +0100
@@ -0,0 +1,156 @@
+// Copyright (c) 1998-2009 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\nkern\x86\vectors.cpp
+// 
+//
+
+// NThreadBase member data
+#define __INCLUDE_NTHREADBASE_DEFINES__
+
+#include <x86.h>
+#include "vectors.h"
+
+#ifdef _DEBUG
+#define __CHECK_LOCK_STATE__
+#endif
+
+void __X86VectorIrq();
+void __X86VectorExc();
+void __X86ExcFault(TAny*);
+
+
+/** Register the global IRQ handler
+	Called by the base port at boot time to bind the top level IRQ dispatcher
+	to the X86 common IRQ handler. Should not be called at any other time.
+
+	The handler specified will be called with IRQs disabled. ESP will point
+	to the top of the interrupt stack. On entry to the handler EAX will point
+	to a block of saved registers, as follows:
+
+	[EAX+00h] = saved EDX
+	[EAX+04h] = saved ECX
+	[EAX+08h] = saved EAX
+	[EAX+0Ch] = saved ES
+	[EAX+10h] = saved DS
+	[EAX+14h] = interrupt vector number
+	[EAX+18h] = return EIP
+	[EAX+1Ch] = return CS
+	[EAX+20h] = return EFLAGS
+	[EAX+24h] = return ESP if interrupt occurred while CPL>0
+	[EAX+28h] = return SS if interrupt occurred while CPL>0
+
+	The handler should preserve all registers other than EAX, ECX, EDX
+	and should return using a standard RET instruction.
+
+	@param	aHandler The address of the top level IRQ dispatcher routine
+ */
+EXPORT_C void X86::SetIrqHandler(TLinAddr aHandler)
+	{
+	X86_IrqHandler=aHandler;
+	}
+
+
+/** Return the address immediately after the end of the interrupt stack.
+
+	@return Interrupt Stack Base + Interrupt Stack Size
+ */
+EXPORT_C TLinAddr X86::IrqStackTop(TInt /*aCpu*/)
+	{
+	return TLinAddr(X86_IrqStack) + IRQ_STACK_SIZE;
+	}
+
+
+void SetTrapGate(SX86Des* aEntry, PFV aHandler, TInt aDPL)
+	{
+	aEntry->iLow=(KRing0CS<<16)|(TUint32(aHandler)&0xffff);
+	aEntry->iHigh=(TUint32(aHandler)&0xffff0000) | 0x8f00 | (aDPL<<13);
+	}
+
+void SetInterruptGate(SX86Des* aEntry, PFV aHandler, TInt aDPL)
+	{
+	aEntry->iLow=(KRing0CS<<16)|(TUint32(aHandler)&0xffff);
+	aEntry->iHigh=(TUint32(aHandler)&0xffff0000) | 0x8e00 | (aDPL<<13);
+	}
+
+void SetTssDescriptor(SX86Des* aEntry, TX86Tss* aTss)
+	{
+	TUint addr3=TUint(aTss)>>24;
+	TUint addr2=(TUint(aTss)>>16)&0xff;
+	TUint addr01=TUint(aTss)&0xffff;
+	aEntry->iLow=(addr01<<16)|(sizeof(TX86Tss)-1);
+	aEntry->iHigh=(addr3<<24)|0x00108900|addr2;
+	}
+
+void X86::Init1Interrupts()
+//
+// Initialise the interrupt and exception vector handlers.
+//
+	{
+//	TheIrqHandler=0;	// done by placing TheIrqHandler, TheFiqHandler in .bss
+	__KTRACE_OPT(KBOOT,DEBUGPRINT(">X86::Init1Interrupts()"));
+	memset(X86_IrqStack,0xaa,IRQ_STACK_SIZE);
+
+#ifndef __STANDALONE_NANOKERNEL__
+	TStackInfo& stackInfo =  TheSuperPage().iStackInfo;
+	stackInfo.iIrqStackBase = X86_IrqStack;
+	stackInfo.iIrqStackSize = IRQ_STACK_SIZE;
+#endif
+	
+	TCpuPage& cp=X86::CpuPage();
+	memclr(cp.iIdt, KIdtSize*sizeof(SX86Des));
+	TInt i;
+	for (i=0; i<64; i++)
+		{
+		if (i==0x03 || i==0x20 || i==0x21)
+			SetTrapGate(cp.iIdt+i, TheExcVectors[i], 3);
+		else if (i<0x20)
+			SetTrapGate(cp.iIdt+i, TheExcVectors[i], 0);
+		if (i>=0x30)
+			SetInterruptGate(cp.iIdt+i, TheExcVectors[i], 0);
+		}
+	X86_IrqNestCount=-1;
+	X86::DefaultCR0=get_cr0();
+	memclr(&cp.iTss,sizeof(TX86Tss));
+	cp.iTss.iCR3=get_cr3();
+	cp.iTss.iSs0=KRing0DS;
+	cp.iTss.iEsp0=get_esp();
+	SetTssDescriptor(&cp.iGdt[5],&cp.iTss);
+	X86_TSS_Ptr=&cp.iTss;
+	__lidt(cp.iIdt,KIdtSize);
+	__KTRACE_OPT(KBOOT,DEBUGPRINT("<X86::Init1Interrupts()"));
+	}
+
+
+/**	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 TInt NKern::CurrentContext()
+	{
+	if (X86_IrqNestCount >= 0)
+		return NKern::EInterrupt;
+	if (TheScheduler.iInIDFC)
+		return NKern::EIDFC;
+	return NKern::EThread;
+	}
+
+extern "C" void ExcFault(TAny*);
+void __X86ExcFault(TAny* aInfo)
+	{
+	ExcFault(aInfo);
+	}
+