100 lines
2.6 KiB
NASM
100 lines
2.6 KiB
NASM
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;//==========================================================================
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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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;
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; **-Does9xOSSupportXMM
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;
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; This function will verify if the operating system supports the XMM
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; instructions. According to Intel documentation
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;
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; Intel Architecture
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; Software Developer
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; Manual
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; Volume 1:
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; Basic Architecture
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;
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; The following needs to be true for the OS to suppor the XMM instructions
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;
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; CR0.EM(bit 2) = 0 (emulation disabled)
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; CR4.OSFXSR(bit 9) = 1 (OS supports saving SIMD floating-point state during context
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; switches)
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;
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; * * * N O T E * * * * * * N O T E * * * * * * N O T E * * * * * * N O T E * * * * * * N O T E * * * * * * N O T E * * *
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;
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; This function will NOT run on windows NT systems. The function reads control registers
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; which are protected under Windows NT. If you attempt to run this function under Windows NT a
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; protected mode access violation will be generated.
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;
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; * * * N O T E * * * * * * N O T E * * * * * * N O T E * * * * * * N O T E * * * * * * N O T E * * * * * * N O T E * * *
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;
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; Assumptions:
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; Access to system control registers CR0 and CR4 are not protected
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;
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; Input:
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; None
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;
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; Output:
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; 1 Returned if OS supports XMM instructions
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; 0 Returned if OS does not support XMM instructions
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;
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;
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.586
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.MODEL flat, SYSCALL, os_dos
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.DATA
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NAME x86cpuid
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PUBLIC Does9xOSSupportXMM_
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PUBLIC _Does9xOSSupportXMM
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.CODE
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; int Does9xOSSupportXMM( void )
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Does9xOSSupportXMM_:
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_Does9xOSSupportXMM:
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push esi ;safety sh*&
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push edi
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push ebp
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push ebx
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push ecx
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push edx
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; check to see if OS supports SIMD instructions
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mov edx,cr0
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bt edx,2 ; ensure no emulation
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jnae NoXMMSupport
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mov edx,cr4
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bt edx,9 ; OS support SIMD
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jnc NoXMMSupport
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; we support XMM instructions
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mov eax,1
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jmp Exit
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NoXMMSupport:
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; mov eax,0 ; OS does not support XMM instructions
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Exit:
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pop edx ;safety sh*&
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pop ecx
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pop ebx
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pop ebp
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pop edi
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pop esi
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ret
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;************************************************
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END
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