// 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\nkern\x86\ncthrd.cia
// 
//

#include <x86.h>

const TLinAddr NKern_Exit = (TLinAddr)NKern::Exit;
const TLinAddr NKern_Lock = (TLinAddr)NKern::Lock;

// Called by a thread when it first runs
__NAKED__ void __StartThread()
	{
	// On entry edi=entry point, esi=parameter block
	asm("sti");
	asm("mov ax, ss");
	asm("mov ds, ax");
	asm("mov es, ax");
	asm("push esi");
	asm("call edi");
	asm("add esp, 4");
	asm("call %a0" : : "i"(NKern_Exit));
	}


// Called by a thread which has been forced to exit
// Interrupts off here, kernel unlocked
__NAKED__ void __DoForcedExit()
	{
	asm("sti");
	asm("call %a0" : : "i"(NKern_Lock));
	asm("mov ecx, [%a0]" : : "i"(&TheScheduler.iCurrentThread));
	asm("mov dword ptr [ecx+%0], 0" : : "i"_FOFF(NThreadBase,iCsCount));
#ifdef __GCC32__
	asm("push ecx");
	asm("call __ZN11NThreadBase4ExitEv"); 
	asm("pop ecx");
#else
	TheScheduler.iCurrentThread->Exit();
#endif
	}



__NAKED__ TUint32 X86::GetCR0()
	{
	asm("mov eax, cr0");
	asm("ret");
	}

__NAKED__ void X86::SetCR0(TUint32)
	{
	asm("mov eax, [esp+4]");
	asm("mov cr0, eax");
	asm("ret");
	}

__NAKED__ TUint32 X86::ModifyCR0(TUint32 /*clear*/, TUint32 /*set*/)
	{
	asm("mov ecx, [esp+4]");
	asm("mov edx, [esp+8]");
	asm("mov eax, cr0");
	asm("not ecx");
	asm("and ecx, eax");
	asm("or ecx, edx");
	asm("mov cr0, ecx");
	asm("ret");
	}