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// Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of the License "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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// e32\kernel\x86\cutils.cia
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//
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//
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#include <x86_mem.h>
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#include <kernel/cache.h>
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#ifdef __SMP__
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#include <apic.h>
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#endif
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const TLinAddr PP_MonitorEntryPoint = (TLinAddr)&PP::MonitorEntryPoint;
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const TLinAddr addressof_CrashState = (TLinAddr)(&CrashState);
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__NAKED__ void DebugOutputChar(TUint)
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//
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// Early debug print code - must hack this for the particular platform.
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// We assume bootstrap trace has already initialised the port.
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//
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{
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asm("check_for_xoff:");
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asm("mov edx, 0x3fd");
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asm("in al, dx");
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asm("test al, 1"); // RX Ready
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asm("jz ok_to_tx"); // no char received
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asm("mov edx, 0x3f8");
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asm("in al, dx");
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asm("cmp al, 0x13"); // check for XOFF
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asm("jne check_for_xoff"); // not XOFF
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asm("wait_for_xon:");
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asm("mov edx, 0x3fd");
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asm("in al, dx");
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asm("test al, 1"); // RX Ready
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asm("jz wait_for_xon");
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asm("mov edx, 0x3f8");
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asm("in al, dx");
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asm("cmp al, 0x11"); // check for XON
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asm("jne wait_for_xon"); // not XON
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asm("ok_to_tx:");
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asm("wait_for_thre:");
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asm("mov edx, 0x3fd");
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asm("in al, dx");
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asm("test al, 0x20"); // TX holding register empty
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asm("jz wait_for_thre");
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asm("mov edx, 0x3f8");
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asm("mov eax, [esp+4]"); // get character
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asm("out dx, al"); // output it
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asm("ret");
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}
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const TLinAddr KernPrintfAddr = (TLinAddr)&Kern::Printf;
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__NAKED__ void KPrintf(const char*, ...)
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{
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asm("mov eax, [%a0]": : "i"(&KernPrintfAddr));
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asm("jmp eax");
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}
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__NAKED__ TInt A::CallSupervisorFunction(TSupervisorFunction, TAny*)
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//
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// Execute an F32 function in supervisor mode
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//
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{
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asm("mov eax, [esp+8]");
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asm("mov ecx, [esp+4]");
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asm("push eax");
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asm("call ecx");
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asm("add esp, 4");
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asm("ret");
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}
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/**
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Default implementation for Kern::NanoWait, which waits for the specified time.
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@param anInterval The time to wait in nanoseconds.
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*/
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__NAKED__ void K::DoNanoWait(TUint32 /*anInterval*/)
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{
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asm("mov eax, [esp+4]");
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asm("mov ecx, 1000");
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asm("mul ecx");
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asm("mov ecx, [%a0]": : "i"(&X86_NanoWaitCal));
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asm("nanowait_loop:");
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asm("sub eax, ecx");
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asm("sbb edx, 0");
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asm("jnc nanowait_loop");
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asm("ret");
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}
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/** Increments atomically a counter that's initially positive
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It checks the previous CPU mode and if it's User, it only applies user permissions when accessing aValue.
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It doesn't increment if aValue is negative or zero.
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@param aValue Reference to the counter to increment
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@return Previous value of counter
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*/
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EXPORT_C __NAKED__ TInt Kern::KUSafeInc(TInt& /*aValue*/)
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{
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asm("mov ecx, [esp+4]");
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asm("mov eax, gs:[ecx]");
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asm("ku_safe_inc_loop:");
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asm("cmp eax, 0");
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asm("jle ku_safe_inc0");
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asm("mov edx, eax");
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asm("inc edx");
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asm("lock cmpxchg gs:[ecx], edx");
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asm("jne ku_safe_inc_loop");
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asm("ku_safe_inc0:");
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asm("ret");
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}
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/** Decrements atomically a counter that's initially positive
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It checks the previous CPU mode and if it's User, it only applies user permissions when accessing aValue.
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It doesn't decrement if aValue is negative or zero.
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@param aValue Reference to the counter to decrement
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@return Previous value of counter
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*/
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EXPORT_C __NAKED__ TInt Kern::KUSafeDec(TInt& /*aValue*/)
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{
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asm("mov ecx, [esp+4]");
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asm("mov eax, gs:[ecx]");
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asm("ku_safe_dec_loop:");
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asm("cmp eax, 0");
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asm("jle ku_safe_dec0");
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asm("mov edx, eax");
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asm("dec edx");
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asm("lock cmpxchg gs:[ecx], edx");
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asm("jne ku_safe_dec_loop");
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asm("ku_safe_dec0:");
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asm("ret");
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}
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/** Returns the current state of interrupts
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@param aRequest indicates which state of interrupts should be returned
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@return if aRequest is ETrue, function returns ETrue if interrupts are enabled and EFalse otherwise
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if aRequest is EFalse, function returns ETrue if interrupts are disabled and EFalse otherwise
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*/
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__NAKED__ TBool InterruptsStatus(TBool aRequest)
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{
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asm("pushfd");
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asm("pop eax");
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asm("shr eax, 9");
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asm("and eax, 1"); // eax = 1 if ints enabled, 0 if not
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asm("mov ecx, [esp+4]");
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asm("test ecx, ecx");
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asm("jnz return_point"); // if checking enabled, done
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asm("xor al, 1"); // otherwise flip result
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asm("return_point:");
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asm("ret");
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}
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