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// Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of the License "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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// e32\memmodel\epoc\multiple\x86\xsched.cia
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//
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//
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#include <x86_mem.h>
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GLDEF_C __NAKED__ void DoProcessSwitch()
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{
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// Enter with kernel locked
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// EBX = pointer to new thread (NThread)
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// EDI = pointer to TScheduler
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// ESI = pointer to TSubScheduler (SMP only)
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// Preserve ESI, EDI
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// eax = new process (DX86PlatProcess)
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asm("mov eax, [ebx+%0]": : "i"_FOFF(NThreadBase,iAddressSpace));
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#ifdef __SMP__
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asm("cmp eax, [esi+%0]": :"i"_FOFF(TSubScheduler,iAddressSpace));
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#else
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asm("cmp eax, [edi+%0]": : "i"_FOFF(TScheduler,iAddressSpace));
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#endif
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asm("jz no_as_switch");
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asm("mov ecx, [eax+%0]": : "i"_FOFF(DMemModelProcess,iGlobalPageDir));
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asm("mov cr3, ecx");
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#ifdef __SMP__
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asm("mov [esi+%0], eax": :"i"_FOFF(TSubScheduler,iAddressSpace));
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#else
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asm("mov [edi+%0], eax": : "i"_FOFF(TScheduler,iAddressSpace));
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#endif
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asm("no_as_switch:");
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// Get DThread* from NThread* (former contains latter so we go backwards in memory to get there)
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asm("mov ecx, 0");
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asm("lea ecx, [ecx+%0]": : "i"_FOFF(DThread,iNThread));
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asm("sub ebx, ecx");
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// check for memory being aliased...
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asm("mov ecx, [ebx+%0]": : "i"_FOFF(DMemModelThread,iAliasLinAddr));
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asm("cmp ecx, 0");
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asm("jz done");
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// restore alias...
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asm("mov edx, [ebx+%0]": : "i"_FOFF(DMemModelThread,iAliasPdePtr));
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asm("mov eax, [ebx+%0]": : "i"_FOFF(DMemModelThread,iAliasPde));
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asm("mov [edx], eax");
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asm("invlpg [ecx]");
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asm("done:");
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asm("ret");
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};
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