// usampler.cia

// 

// Copyright (c) 2007 - 2010 Accenture. All rights reserved.

// This component and the accompanying materials are made available

// under the terms of the "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:

// Accenture - Initial contribution

//

#include <platform.h>

#include <kern_priv.h>		//temporary

#if defined(__GCC32__)

// CIA symbol macros for Gcc98r2

#define CSM__ZN5NKern14CurrentContextEv " CurrentContext__5NKern"

#elif defined(__ARMCC__)

// CIA symbol macros for RVCT

#define CSM__ZN5NKern14CurrentContextEv " __cpp(NKern::CurrentContext)"

#else

// CIA symbol macros for EABI assemblers

#define CSM__ZN5NKern14CurrentContextEv " _ZN5NKern14CurrentContextEv"

#endif

__NAKED__ TUint IntStackPtr()

	{

	asm("mrs r1, cpsr ");

	asm("bic r3, r1, #0x1f ");

//#ifdef __MISA__

//	asm("orr r3, r3, #0xd1 ");		// mode_fiq, all interrupts off

//#else

	asm("orr r3, r3, #0xd2 ");		// mode_irq, all interrupts off

//#endif

	asm("msr cpsr, r3 ");

	asm("mov r0, sp ");				// r0=sp_irq or sp_fiq

	asm("msr cpsr, r1 ");			// restore interrupts

	__JUMP(,lr);

	}

__NAKED__ TUint32 SPSR()

	{

	asm("mrs r0, spsr ");

	__JUMP(,lr);

	}

// This will return 1 if it was iDFC interrupted (0 otherwise).

// As there is no Kernel interface for that, we have to 'fake' Kernel by

// setting SVC mode before calling NKern::CurrentContext.

// Without that, CurrentContext would always return EInterrupt.

__NAKED__ TUint IDFCRunning()

	{

	asm("stmfd sp!, {r4-r5} ");	

	asm("mrs r5, cpsr");							// r5 = cpsr_irq

	asm("bic r4, r5, #0xdf ");						// clear interrupt mask & CPU mode

	asm("orr r4, r4, #0xd3 ");						// disable all interrupts and set SVC mode

	asm("msr CPSR_cf, r4");   						// switch to SVC, (dissable FIQ, IRQ)

	// NKern::CurrentContext does not use sp (only r0,r1,r2)

	// It is just lr in svc mode we need to preserve.

	asm("mov r4, lr");             					// r4 = lr_svc

	asm("bl " CSM__ZN5NKern14CurrentContextEv ); 	// r0 = 1 if iDFC was running, 0 if a thread was running

	asm("mov lr, r4");								// lr_svc is back to original state

	asm("msr CPSR_cf, r5");							// return to IRQ mode

	asm("ldmfd sp!, {r4-r5} ");

	__JUMP(,lr);

	}