52 lines
1.5 KiB
C++
52 lines
1.5 KiB
C++
//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// Purpose:
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//
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// $NoKeywords: $
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//=============================================================================//
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#include "pch_tier0.h"
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#include <stdio.h>
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#include "tier0/fasttimer.h"
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// g_dwClockSpeed is only exported for backwards compatibility.
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PLATFORM_INTERFACE unsigned long g_dwClockSpeed;
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uint64 g_ClockSpeed; // Clocks/sec
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// Storing CPU clock speed in a 32-bit variable is dangerous and can already overflow
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// on some CPUs. This variable is deprecated.
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unsigned long g_dwClockSpeed;
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#if defined( _X360 ) && defined( _CERT )
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unsigned long g_dwFakeFastCounter;
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#endif
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double g_ClockSpeedMicrosecondsMultiplier;
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double g_ClockSpeedMillisecondsMultiplier;
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double g_ClockSpeedSecondsMultiplier;
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// Constructor init the clock speed.
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CClockSpeedInit g_ClockSpeedInit CONSTRUCT_EARLY;
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void CClockSpeedInit::Init()
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{
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const CPUInformation& cpuinfo = *GetCPUInformation();
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g_ClockSpeed = cpuinfo.m_Speed;
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// cycle counter runs as doc'd at 1/64 Xbox 3.2GHz clock speed, thus 50 Mhz
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if ( IsX360() )
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{
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g_ClockSpeed /= 64L;
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}
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// Avoid integer overflow when writing to g_dwClockSpeed
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if ( g_ClockSpeed <= ULONG_MAX )
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g_dwClockSpeed = (unsigned long)g_ClockSpeed;
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else
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g_dwClockSpeed = ULONG_MAX;
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g_ClockSpeedMicrosecondsMultiplier = 1000000.0 / (double)g_ClockSpeed;
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g_ClockSpeedMillisecondsMultiplier = 1000.0 / (double)g_ClockSpeed;
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g_ClockSpeedSecondsMultiplier = 1.0 / (double)g_ClockSpeed;
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}
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