// 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 "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\x86\ncutils.cia
// 
//

#include <x86.h>

EXPORT_C __NAKED__ TUint64 X86::Timestamp()
	{
	asm("rdtsc");
	asm("ret");
	}

extern "C" __NAKED__ void NKIdle(TInt)
	{
	asm("hlt");
	asm("ret");
	}

__NAKED__ void InitFpu()
	{
	asm("mov eax, cr0");
	asm("and al, 0xf7");	// enable access to FPU
	asm("mov cr0, eax");
	asm("fninit");
	asm("lea ecx, %a0": : "i"(DefaultCoprocessorState));
	asm("fwait");
	asm("fnsave [ecx]");	// save clean coprocessor state
	asm("fwait");
	asm("or al, 8");
	asm("mov cr0, eax");	// disable access to coprocessor
	asm("ret");
	}


const TLinAddr addressof_CrashState = (TLinAddr)&::CrashState;
const TLinAddr addressof_X86_Regs = (TLinAddr)&::X86_Regs;
const TLinAddr addressof_X86_IrqNestCount = (TLinAddr)&::X86_IrqNestCount;

/** @internalTechnology

	Called to indicate that the system has crashed and all CPUs should be
	halted and should dump their registers.

	Doesn't return
*/
__NAKED__ void NKern::NotifyCrash(const TAny* /*a0*/, TInt /*a1*/)
	{
	asm("pushfd ");
	asm("cli ");
	asm("push ebp ");
	asm("mov ebp, %0" : : "i" (addressof_CrashState));
	asm("mov dword ptr [ebp], 1 ");
	asm("mov ebp, %0" : : "i" (addressof_X86_Regs));
	asm("mov [ebp+%0], eax" : : "i" _FOFF(SFullX86RegSet,iEax));
	asm("mov [ebp+%0], ebx" : : "i" _FOFF(SFullX86RegSet,iEbx));
	asm("mov [ebp+%0], ecx" : : "i" _FOFF(SFullX86RegSet,iEcx));
	asm("mov [ebp+%0], edx" : : "i" _FOFF(SFullX86RegSet,iEdx));
	asm("mov [ebp+%0], esi" : : "i" _FOFF(SFullX86RegSet,iEsi));
	asm("mov [ebp+%0], edi" : : "i" _FOFF(SFullX86RegSet,iEdi));
	asm("pop dword ptr [ebp+%0]" : : "i" _FOFF(SFullX86RegSet,iEbp));			// pushed EBP
	asm("pop dword ptr [ebp+%0]" : : "i" _FOFF(SFullX86RegSet,iEflags));		// pushed EFLAGS
	asm("pop dword ptr [ebp+%0]" : : "i" _FOFF(SFullX86RegSet,iEip));			// return address
	asm("pop dword ptr [ebp+%0]" : : "i" _FOFF(SFullX86RegSet,iFaultCategory));	// a0 parameter
	asm("pop dword ptr [ebp+%0]" : : "i" _FOFF(SFullX86RegSet,iFaultReason));	// a1 parameter
	asm("mov [ebp+%0], esp" : : "i" _FOFF(SFullX86RegSet,iEsp));
	asm("lea eax, [ebp+%0]" : : "i" _FOFF(SFullX86RegSet,iCs));
	asm("mov [eax], cs ");
	asm("mov [eax+4], ds ");
	asm("mov [eax+8], es ");
	asm("mov [eax+12], fs ");
	asm("mov [eax+16], gs ");
	asm("mov [eax+20], ss ");
	asm("mov ebx, %0" : : "i" (addressof_X86_IrqNestCount));
	asm("mov eax, 0x80000000 ");
	asm("lock xchg eax, [ebx] ");
	asm("mov [ebp+%0], eax" : : "i" _FOFF(SFullX86RegSet,iIrqNestCount));

	asm("xor eax, eax ");
	asm("push eax ");
	asm("push eax ");
	asm("push eax ");
	asm("call %a0" : : "i" (NKCrashHandler));
	asm("pop eax ");
	asm("pop eax ");
	asm("pop eax ");
	asm("push dword ptr [ebp+%0]" : : "i" _FOFF(SFullX86RegSet,iFaultReason));		// a1 parameter
	asm("push dword ptr [ebp+%0]" : : "i" _FOFF(SFullX86RegSet,iFaultCategory));	// a0 parameter
	asm("push 1 ");
	asm("call %a0" : : "i" (NKCrashHandler));

	asm("int 0xff ");	// shouldn't get here
	}