// 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\memmodel\epoc\multiple\x86\xmmu.cia

// 

//

#include <x86_mem.h>

#if defined(KMMU)

extern "C" void __DebugMsgFlushTLB();

extern "C" void __DebugMsgLocalFlushTLB();

extern "C" void __DebugMsgTotalFlushTLB();

extern "C" void __DebugMsgINVLPG(int a);

#endif

extern "C"

{

__NAKED__ void __fastcall DoInvalidateTLBForPage(TLinAddr /*aLinAddr*/)

//

// Flush a specified virtual address from the TLB.

//

	{

	ASM_DEBUG1(INVLPG,ecx)

	asm("invlpg [ecx]");

	asm("ret");

	}

// On 486 and Pentium this invalidates all TLB entries.

// On P6 and later CPUs it only invalidates non-global TLB entries.

__NAKED__ void DoLocalInvalidateTLB()

	{

	ASM_DEBUG0(LocalFlushTLB)

	asm("mov eax, cr3");

	asm("mov cr3, eax");

	asm("ret");

	}

// This function is only used on P6 and later CPUs.

// It invalidates all TLB entries, including global ones.

extern "C" __NAKED__ void DoTotalInvalidateTLB()

	{

	ASM_DEBUG0(TotalFlushTLB)

	asm("pushfd");

	asm("mov eax, cr3");

	MOV_ECX_CR4;

	asm("mov edx, ecx");

	asm("and dl, 0x7f");

	asm("cli");

	MOV_CR4_EDX;

	asm("mov cr3, eax");

	MOV_CR4_ECX;

	asm("popfd");

	asm("ret");

	}

// Invalidate all TLB entries regardless of CPU type.

__NAKED__ void DoInvalidateTLB()

	{

	ASM_DEBUG0(FlushTLB)

	asm("mov edx, [%a0]": : "i"(&X86_UseGlobalPTEs));

	asm("mov eax, cr3");

	asm("cmp edx, 0");

	asm("jz no_global_pages");

	MOV_ECX_CR4;

	asm("mov edx, ecx");

	asm("and dl, 0x7f");

	asm("pushfd");

	asm("cli");

	MOV_CR4_EDX;

	asm("mov cr3, eax");

	MOV_CR4_ECX;

	asm("popfd");

	asm("ret");

	asm("no_global_pages:");

	asm("mov cr3, eax");

	asm("ret");

	}

}

__NAKED__ void DMemModelThread::RestoreAddressSpace()

	{

#ifndef __SMP__

	//SMP FIXME

	asm("mov eax, [%a0]": : "i"(&TheScheduler.iCurrentThread));

	// edx = current thread owning process...

	asm("mov edx, 0");

	asm("lea edx, [edx+%0]": : "i"_FOFF(DThread,iNThread));

	asm("neg edx");

	asm("mov edx, [eax+edx+%0]": : "i"_FOFF(DThread,iOwningProcess));

	// update page directory and address space values...

	asm("cli");

	asm("mov [%a0], edx": :"i"(&TheScheduler.iAddressSpace));

	asm("mov [eax+%0], edx": : "i"_FOFF(NThreadBase,iAddressSpace));

	asm("mov edx, [edx+%0]": : "i"_FOFF(DMemModelProcess,iGlobalPageDir));

	asm("mov cr3, edx");

	asm("sti");

#endif

	asm("ret");

	}