// 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 "Symbian Foundation License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.symbianfoundation.org/legal/sfl-v10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

// e32\euser\epoc\x86\uc_utl.cia

// 

//

#include <u32exec.h>

#include <e32base.h>

#include <e32rom.h>

#include <e32svr.h>

#include <e32hashtab.h>

// Dummy so we can use same DEF file as WINS

EXPORT_C void BootEpoc(TBool)

	{

	}

EXPORT_C __NAKED__ void RFastLock::Wait()

	{

	THISCALL_PROLOG0()

	asm("lock sub dword ptr [ecx+4], 1");

	asm("jnc fast_lock_wait_sem");

	THISCALL_EPILOG0()

	asm("fast_lock_wait_sem:");

	asm("mov eax, %0": : "i"(EExecSemaphoreWait));

	asm("mov ecx, [ecx]");

	asm("xor edx, edx");

	asm("int 0x21");

	THISCALL_EPILOG0()

	}

EXPORT_C __NAKED__ void RFastLock::Signal()

	{

	THISCALL_PROLOG0()

	asm("lock add dword ptr [ecx+4], 1");

	asm("jne fast_lock_signal_sem");

	THISCALL_EPILOG0()

	asm("fast_lock_signal_sem:");

	asm("mov eax, %0": : "i"(EExecSemaphoreSignal1));

	asm("mov ecx, [ecx]");

	asm("int 0x21");

	THISCALL_EPILOG0()

	}

#ifdef __MEM_MACHINE_CODED__

__NAKED__ EXPORT_C void Mem::Swap( TAny* /*aPtr1*/, TAny* /*aPtr2*/, TInt /*aLength*/ )

/**

Swaps a number of bytes of data between two specified locations.

The source and target areas can overlap.

@param aPtr1   A pointer to the first location taking part in the swap. 

@param aPtr2   A pointer to second location taking part in the swap. 

@param aLength The number of bytes to be swapped between the two locations. 

               This value must not be negative.

@panic USER 94 In debug builds only, if aLength is negative.

*/

//

//	Swap the contents of *aPtr1 with *aPtr2.

//	NB We assume ES=DS on entry.

//

	{

	asm("push esi");

	asm("push edi");

	asm("mov edi,[esp+12]");// aPtr1 address into edi

	asm("mov esi,[esp+16]");// aPtr2 address into esi

	asm("mov ecx,[esp+20]");// byte count into ecx

	asm("pushfd");

	asm("test ecx,ecx");	//

	asm("jz short memswap0");// if length=0, nothing to do

	asm("cld");				// go forwards through array

	asm("cmp ecx,7");		// if length<7 don't bother with alignment check

	asm("jc short memswap1");//

	asm("mov edx,ecx");		// length into edx

	// number of bytes to align aPtr1 = 4-(edi mod 4)

	asm("mov ecx,4");		

	asm("sub ecx,edi");		//

	asm("and ecx,3");		// into ecx

	asm("jz short memswap2");// if aligned, proceed with dword swap

	asm("sub edx,ecx");		// subtract number of bytes from length

	asm("memswap3:");

	asm("mov al,[edi]");	// al = *aPtr1

	asm("mov ah,[esi]");	// ah = *aPtr2

	asm("mov [esi],al");	// *aPtr2=al

	asm("mov [edi],ah");	// *aPtr1=ah

	asm("inc esi");			// aPtr2++

	asm("inc edi");			// aPtr1++

	asm("dec ecx");			//

	asm("jnz short memswap3");// loop ecx times - edi is now dword aligned

	asm("memswap2:");

	asm("push ebx");		// preserve ebx

	asm("mov ecx,edx");		// length back into ecx

	asm("mov ah,cl");		// save lower two bits of dword count in ah bits 3,2

	asm("add ecx,12");		// divide dword count by 4, rounding to next higher integer

	asm("shr ecx,4");		// this gives loop count for unfolded loop

	asm("shl ah,4");		// lower two bits of dword count into ah bits 7,6

	asm("sahf");			// and into SF,ZF

	asm("jns short memswap8");// branch if lower two bits of dword count = 0 or 1

	asm("jz short memswap5");// if lower two bits = 3, miss out first unfolding of loop

	asm("jnz short memswap6");	// if lower two bits = 2, miss out first two unfoldings

	asm("memswap8:");

	asm("jz short memswap7");// if lower two bits = 1, miss out first three unfoldings

	asm("memswap4:");

	asm("mov eax,[edi]");	// eax = *aPtr1

	asm("mov ebx,[esi]");	// ebx = *aPtr2

	asm("mov [esi],eax");	// *aPtr2=eax

	asm("mov [edi],ebx");	// *aPtr1=ebx

	asm("add edi,4");		// aPtr1++

	asm("add esi,4");		// aPtr2++

	asm("memswap5:");

	asm("mov eax,[edi]");	// eax = *aPtr1

	asm("mov ebx,[esi]");	// ebx = *aPtr2

	asm("mov [esi],eax");	// *aPtr2=eax

	asm("mov [edi],ebx");	// *aPtr1=ebx

	asm("add edi,4");		// aPtr1++

	asm("add esi,4");		// aPtr2++

	asm("memswap6:");

	asm("mov eax,[edi]");	// eax = *aPtr1

	asm("mov ebx,[esi]");	// ebx = *aPtr2

	asm("mov [esi],eax");	// *aPtr2=eax

	asm("mov [edi],ebx");	// *aPtr1=ebx

	asm("add edi,4");		// aPtr1++

	asm("add esi,4");		// aPtr2++

	asm("memswap7:");

	asm("mov eax,[edi]");	// eax = *aPtr1

	asm("mov ebx,[esi]");	// ebx = *aPtr2

	asm("mov [esi],eax");	// *aPtr2=eax

	asm("mov [edi],ebx");	// *aPtr1=ebx

	asm("add edi,4");		// aPtr1++

	asm("add esi,4");		// aPtr2++

	asm("dec ecx");

	asm("jnz short memswap4");	// loop ecx times to do main part of swap

	asm("mov ecx,edx");		// length back into ecx

	asm("pop ebx");			// restore ebx

	asm("and ecx,3");		// number of remaining bytes to move

	asm("jz short memswap0");// if zero, we are finished

	asm("memswap1:");		// *** come here for small swap

	asm("mov al,[edi]");	// al = *aPtr1

	asm("mov ah,[esi]");	// ah = *aPtr2

	asm("mov [esi],al");	// *aPtr2=al

	asm("mov [edi],ah");	// *aPtr1=ah

	asm("inc esi");			// aPtr2++

	asm("inc edi");			// aPtr1++

	asm("dec ecx");			//

	asm("jnz short memswap1");	// loop ecx times - edi is now dword aligned

	asm("memswap0:");

	asm("popfd");

	asm("pop edi");

	asm("pop esi");

	asm("ret");

	}

#endif

// Hash an 8 bit string at aPtr, length aLen bytes.

__NAKED__ TUint32 DefaultStringHash(const TUint8* /*aPtr*/, TInt /*aLen*/)

	{

	asm("push esi");

	asm("mov esi, [esp+8]");

	asm("mov ecx, [esp+12]");

	asm("xor eax, eax");

	asm("sub ecx, 4");

	asm("jb lt4");

	asm("ge4:");

	asm("xor eax, [esi]");

	asm("add esi, 4");

	asm("mov edx, 0x9E3779B9");

	asm("mul edx");

	asm("sub ecx, 4");

	asm("jae ge4");

	asm("lt4:");

	asm("add ecx, 4");

	asm("jz done");

	asm("xor edx, edx");

	asm("cmp ecx, 2");

	asm("jbe le2");

	asm("mov dl, [esi+2]");

	asm("shl edx, 16");

	asm("le2:");

	asm("cmp ecx, 2");

	asm("jb onemore");

	asm("mov dh, [esi+1]");

	asm("onemore:");

	asm("mov dl, [esi]");

	asm("xor eax, edx");

	asm("mov edx, 0x9E3779B9");

	asm("mul edx");

	asm("done:");

	asm("pop esi");

	asm("ret");

	}

// Hash a 16 bit string at aPtr, length aLen bytes.

__NAKED__ TUint32 DefaultWStringHash(const TUint16* /*aPtr*/, TInt /*aLen*/)

	{

	asm("push esi");

	asm("mov esi, [esp+8]");

	asm("mov ecx, [esp+12]");

	asm("xor eax, eax");

	asm("sub ecx, 8");

	asm("jb lt8");

	asm("ge8:");

	asm("mov edx, [esi+4]");

	asm("xor eax, [esi]");

	asm("add esi, 8");

	asm("rol edx, 8");

	asm("xor eax, edx");

	asm("mov edx, 0x9E3779B9");

	asm("mul edx");

	asm("sub ecx, 8");

	asm("jae ge8");

	asm("lt8:");

	asm("add ecx, 8");

	asm("jz done_defwstrhash");

	asm("xor edx, edx");

	asm("cmp ecx, 4");

	asm("jbe le4");

	asm("mov dx, [esi+4]");

	asm("rol edx, 8");

	asm("xor eax, edx");

	asm("xor edx, edx");

	asm("le4:");

	asm("cmp ecx, 4");

	asm("jb onemore_defwstrhash");

	asm("mov dx, [esi+2]");

	asm("shl edx, 16");

	asm("onemore_defwstrhash:");

	asm("mov dx, [esi]");

	asm("xor eax, edx");

	asm("mov edx, 0x9E3779B9");

	asm("mul edx");

	asm("done_defwstrhash:");

	asm("pop esi");

	asm("ret");

	}

/**

@publishedAll

@released

Calculate a 32 bit hash from a 32 bit integer.

@param	aInt	The integer to be hashed.

@return			The calculated 32 bit hash value.

*/

EXPORT_C __NAKED__ TUint32 DefaultHash::Integer(const TInt& /*aInt*/)

	{

	asm("mov edx, [esp+4]");

	asm("mov eax, 0x9E3779B9");

	asm("mul dword ptr [edx]");

	asm("ret");

	}