153 lines
4.5 KiB
C
153 lines
4.5 KiB
C
//==========================================================================
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//
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// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
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// KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
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// PURPOSE.
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//
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// Copyright (c) 1999 - 2001 On2 Technologies Inc. All Rights Reserved.
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//
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//--------------------------------------------------------------------------
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#include <windows.h>
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#include <stdarg.h>
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#include "cpuidlib.h"
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#include "cidasm.h"
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#include <process.h>
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#include <stdio.h>
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extern int WillametteNewInstructionOSSupport();
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extern int WillametteNewInstructionHWSupport();
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/*
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* **-DoesOSSupportXMM
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*
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* This function will check to see if the operating supports the XMM (Pentium III) instructions
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* The XMM functionality adds 8 128-bit registers to the pentium II register set. With the addition
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* of the new registers the OS needs to preserve and restore the registers on task switches.
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*
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* Inputs:
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* None
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*
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* Outputs:
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* True returned if the OS supports the XMM instructions.
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* False returned if the OS does not suppor the XMM instructions.
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*/
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int DoesOSSupportXMM( void )
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{
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OSVERSIONINFO OSInformation; // Data structure where OS version will be filled in
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int ReturnValue = FALSE; // Preload to fail
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// need to initilize size of OS info structure before calling GetVersionEx
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OSInformation.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
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if( !GetVersionEx( &OSInformation ) ) // Get OS information
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{
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/*
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* having trouble getting OS information
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* to be safe will return that we do not support XMM
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* instructions
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*/
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// ReturnValue = FALSE;
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}
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if( OSInformation.dwPlatformId == VER_PLATFORM_WIN32_NT )
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// if( 1 )
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{
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/*
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* If we are on a windows NT system we cannot directly
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* read the control registers to see if the OS supports
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* the XMM instructions. We will just check to see if
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* service pack 4 is installed.
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*/
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int ServicePackNumber;
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if( strcmp(OSInformation.szCSDVersion, "" ) != 0 ) // is there a service pack installed?
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{
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// Yes, get service pack revision
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char Junk[132], Junk2[132];
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sscanf( OSInformation.szCSDVersion, "%s %s %d", Junk, Junk2, &ServicePackNumber );
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}
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else
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{
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ServicePackNumber = 0;
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}
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if( OSInformation.dwMajorVersion == 4 && // must be versio 4 or greater
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ServicePackNumber >= 4 || // must have service pack 4 or greater
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OSInformation.dwMajorVersion >=5)
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{
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ReturnValue = TRUE;
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}
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else
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{
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// ReturnValue = FALSE;
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}
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#if 0
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// some handy debugging info if you are desperate
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printf("OS Major Revision %d\n", OSInformation.dwMajorVersion );
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printf("OS Minor REvision %d\n", OSInformation.dwMinorVersion );
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printf("Service Pack Number %d\n", ServicePackNumber );
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#endif
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}
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else
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{
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/*
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* we are on a Windows 9x system.
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*/
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//if( Does9xOSSupportXMM()) // does the Windows 9x support the XMM instructions?
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{
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ReturnValue = TRUE; // yup
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}
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//else
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//{
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//ReturnValue = FALSE; // Nope, don't support XMM instructions
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//}
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}
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return( ReturnValue );
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}
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/*
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* **-findCPUId
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*
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* See cpuidlib.h for a detailed description of this function
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*/
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PROCTYPE findCPUId( void )
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{
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PROCTYPE CpuType;
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// return 0;
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// return (PII); // drop to next lowest type of CPU which should be the Pentium II processor
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CpuType = getCPUType(); // Get version of processor
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// The code to check whether willammete instructions are called attempts to run
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// an illegal instruction. Under 98 mplayer crashes the os as soon as the illegal
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// instruction is called, so I've disabled it.
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if( CpuType == XMM ) // If the CPU supports XMM (Pentium III) instructions
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{
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// if( DoesOSSupportXMM()) // need to check to see if the OS supports the XMM instructions
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{
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if( WillametteNewInstructionHWSupport()&&
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WillametteNewInstructionOSSupport())
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{
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CpuType = WMT;
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}
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}
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// else
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// {
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// os does not support the XMM instructions
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// CpuType = PII; // drop to next lowest type of CPU which should be the Pentium II processor
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// }
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}
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return( CpuType );
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}
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