// Copyright (c) 1997-2009 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:

//

#include <e32cia.h>

#include <arm_mem.h>

#ifdef _DEBUG

#define ASM_KILL_LINK(rp,rs)	asm("mov "#rs", #0xdf ");\

								asm("orr "#rs", "#rs", "#rs", lsl #8 ");\

								asm("orr "#rs", "#rs", "#rs", lsl #16 ");\

								asm("str "#rs", ["#rp"] ");\

								asm("str "#rs", ["#rp", #4] ");

#else

#define ASM_KILL_LINK(rp,rs)

#endif

__NAKED__ TInt ThreadDoReadAndParseDesHeader(DThread* aThread, const TAny* aSrc, TUint32* aDest)

	{

	asm("stmdb sp!, {r4-r7, lr} ");	// stack unaligned, but we only call assembler

#ifdef __SMP__

	GET_RWNO_TID(,r6);														// r6->TSubScheduler - can't migrate since we hold system lock

	asm("ldr r3, [r0, #%a0]" : : "i" _FOFF(DThread,iOwningProcess));		// r3->target process

	asm("ldr r4, [r6, #%a0]" : : "i" _FOFF(TSubScheduler,iAddressSpace));	// r4->current process

	asm("ldr r5, [r6, #%a0]" : : "i" _FOFF(TSubScheduler,iCurrentThread));	// r5->current NThread

#else

	asm("ldr r6, __TheScheduler ");											// r6->TheScheduler

	asm("ldr r3, [r0, #%a0]" : : "i" _FOFF(DThread,iOwningProcess));		// r3->target process

	asm("ldr r4, [r6, #%a0]" : : "i" _FOFF(TScheduler,iAddressSpace));		// r4->current process

	asm("ldr r5, [r6, #%a0]" : : "i" _FOFF(TScheduler,iCurrentThread));		// r5->current NThread

#endif

	// set TheCurrentThread->iIpcClient to this thread

#ifdef _DEBUG

	asm("ldr r12, [r5, #%a0] " : : "i" (_FOFF(DThread, iIpcClient) - _FOFF(DThread, iNThread)));

	asm("teq r12, #0 ");

	asm("bne __FaultIpcClientNotNull ");

#endif

	asm("str r0, [r5, #%a0] " : : "i" (_FOFF(DThread, iIpcClient) - _FOFF(DThread, iNThread)));

	// switch address space to process r3...

	asm("mrc p15, 0, r7, c2, c0, 0 ");		// r7 = original TTBR0

	asm("ldr r0, [r3, #%a0]" : : "i" _FOFF(DMemModelProcess,iLocalPageDir));	// r0->target process page directory

	asm("ldr r12, [r3, #%a0]" : : "i" _FOFF(DMemModelProcess,iOsAsid));			// r12 = target ASID

#ifdef __SMP__

	__ASM_CLI();

#else

	CPSIDIF;								// disable all interrupts

#endif

	asm("mcr p15, 0, r12, c7, c10, 4 ");	// drain write buffer before changing MMU registers (see ARMv6 specs)

	asm("and lr, r7, #%a0" : : "i" ((TInt)KTTBRExtraBitsMask));	// lr = TTBR0 extra bits

	asm("orr lr, lr, r0 ");					// target process page directory + extra bits

	UPDATE_PW_CACHING_ATTRIBUTES(,lr);		// ERRATUM 1136_317041

	asm("mcr p15, 0, lr, c2, c0, 0 ");		// change TTBR0

	asm("mcr p15, 0, r12, c13, c0, 1 ");	// change ASID

#if defined(__CPU_ARM11MP__)

	// On other platforms, tha ASID change above has already flushed the branch prediction buffers 

	asm("mcr p15, 0, r12, c7, c5, 6 ");		// flush BTAC

#endif

#ifdef __SMP__

	asm("str r3, [r6, #%a0]" : : "i" _FOFF(TSubScheduler,iAddressSpace));

#else

	asm("str r3, [r6, #%a0]" : : "i" _FOFF(TScheduler,iAddressSpace));

#endif

	asm("str r3, [r5, #%a0]" : : "i" _FOFF(NThread,iAddressSpace));

#ifdef __SMP__

	__ASM_STI();

#else

	CPSIEIF;								// enable all interrupts

#endif

	// read and parse the descriptor header

	asm("bl read_and_parse_des_header_local");	// defined in e32/kernel/arm/cipc.cia

	// restore address space to process r4...

	asm("ldr r12, [r4, #%a0]" : : "i" _FOFF(DMemModelProcess,iOsAsid));		// r12 = current process ASID

#ifdef __SMP__

	__ASM_CLI();

#else

	CPSIDIF;								// disable all interrupts

#endif

	asm("mcr p15, 0, r12, c7, c10, 4 ");	// drain write buffer before changing MMU registers (see ARMv6 specs)

	UPDATE_PW_CACHING_ATTRIBUTES(,r7);		// ERRATUM 1136_317041

	asm("mcr p15, 0, r7, c2, c0, 0 ");		// restore TTBR0

	asm("mcr p15, 0, r12, c13, c0, 1 ");	// restore ASID

#if defined(__CPU_ARM11MP__)

	// On other platforms, the ASID change above has already flushed the branch prediction buffers 

	asm("mcr p15, 0, r12, c7, c5, 6 ");		// flush BTAC

#endif

#ifdef __SMP__

	asm("str r4, [r6, #%a0]" : : "i" _FOFF(TSubScheduler,iAddressSpace));

#else

	asm("str r4, [r6, #%a0]" : : "i" _FOFF(TScheduler,iAddressSpace));

#endif

	asm("str r4, [r5, #%a0]" : : "i" _FOFF(NThread,iAddressSpace));

#ifdef __SMP__

	__ASM_STI();

#else

	CPSIEIF;								// enable all interrupts

#endif

	// set TheCurrentThread->iIpcClient to NULL again

	asm("mov r12, #0 ");

	asm("str r12, [r5, #%a0] " : : "i" (_FOFF(DThread, iIpcClient) - _FOFF(DThread, iNThread)));

	// finished...

	__POPRET("r4-r7,");

#ifndef __SMP__

	asm("__TheScheduler: ");

	asm(".word TheScheduler ");

#endif

	}