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51 lines
1.5 KiB
51 lines
1.5 KiB
//========= 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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