// Copyright (c) 2008-2009 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\arm\nk_entry.cia
// 
//

#include <e32cia.h>
#include <arm.h>
#include "nk_priv.h"

#include "entry.h"

#ifndef	EKA2_ENTRY_POINT_VERSION_IDENTIFIER
#define	EKA2_ENTRY_POINT_VERSION_IDENTIFIER	\
	asm("tst pc, #%a0" : : "i" ((TInt)0) )
#endif

extern "C" {

extern void HwInit0();
extern void KernelMain();
extern TLinAddr RomHeaderAddress;
extern TLinAddr SuperPageAddress;


/*
 * The main startup program
 * aRomHeader is address of ROM header passed in by bootstrap
 * aSuperPage is address of super page passed in by bootstrap
 *
 * *** NOTE ***
 * This is written in assembler in order that nk_exe.lib can be built entirely
 * from one source file. This is necessary to ensure that the vector table above
 * appears at the very beginning of the ekern.exe code section.
 * ************
 */
#if defined(__GCC32__)
GLDEF_C __NAKED__ void _E32Startup(TLinAddr /*aRomHeader*/, TLinAddr /*aSuperPage*/)
	{
	EKA2_ENTRY_POINT_VERSION_IDENTIFIER;	// DUMMY INSTRUCTION TO INDICATE EKA2 ENTRY POINT
	asm("ldr r2, __RomHeaderAddress ");
	asm("b 1f ");				// branch over space for unique ID

	asm(".word 0 ");			// loader will replace with code seg unique ID
								// for RAM-loaded code segment
								// MUST BE AT OFFSET 12 FROM ENTRY POINT

	asm("1: ");
	asm("ldr r3, __SuperPage ");
	asm("str r0, [r2] ");
	asm("str r1, [r3] ");

	asm("bl HwInit0 ");

	asm("ldr r4, __CtorList ");
	
	asm("1: ");
	asm("ldr r0, [r4, #4]! ");
	asm("adr lr, 1b ");
	asm("cmp r0, #0 ");
	__JUMP(ne,r0);

	asm("b KernelMain ");

	asm("__RomHeaderAddress: ");
	asm(".word RomHeaderAddress ");
	asm("__SuperPage: ");
	asm(".word SuperPageAddress ");
	asm("__CtorList: ");
	asm(".word __CTOR_LIST__ ");
	}
#elif defined(__EABI__)
void __DLL_Export_Table__(void);
void __cpp_initialize__aeabi_();
  
// The compiler generates calls to this when it reckons a top-level construction
// needs destruction. But the kernel never will need this so, define it as a nop
void __record_needed_destruction (void * d){}
// 2.1 calls __aeabi_atexit passing __dso_handle. This can be a dummy (i.e. just a label)

__NAKED__  void __dso_handle(void) {}
void __aeabi_atexit(void *object, void (*dtor)(void *), void *handle){}

void _E32Startup_Body(TLinAddr aRomHeader, TLinAddr aSuperPage);

__NAKED__ void _E32Startup(TLinAddr aRomHeader, TLinAddr aSuperPage)
	{
	EKA2_ENTRY_POINT_VERSION_IDENTIFIER;	// DUMMY INSTRUCTION TO INDICATE EKA2 ENTRY POINT
	asm("b _E32Startup_Body ");
	asm(".word 0 ");			// padding

	asm(".word 0 ");			// loader will replace with code seg unique ID
								// for RAM-loaded code segment
								// MUST BE AT OFFSET 12 FROM ENTRY POINT
	}

GLDEF_C void _E32Startup_Body(TLinAddr aRomHeader, TLinAddr aSuperPage)
	{
	RomHeaderAddress = aRomHeader;
	SuperPageAddress = aSuperPage;
	HwInit0();

	// RVCT specific initialization

	// Make sure we get an export table
	__DLL_Export_Table__();

	// Initialise static data
	__cpp_initialize__aeabi_();

	KernelMain();
	}
#else
#error Not supported
#endif

}