Initial community commit

Src/libvpShared/corelibs/CpuID/Win32/D9xOSSupXMM.asm

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+;//==========================================================================
+;//
+;//  THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
+;//  KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+;//  IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
+;//  PURPOSE.
+;//
+;//  Copyright (c) 1999 - 2001  On2 Technologies Inc. All Rights Reserved.
+;//
+;//--------------------------------------------------------------------------
+
+
+;
+; **-Does9xOSSupportXMM
+;
+; This function will verify if the operating system supports the XMM
+; instructions.  According to Intel documentation 
+;
+;       Intel Architecture
+;       Software Developer
+;       Manual
+;       Volume 1:
+;       Basic Architecture
+;
+; The following needs to be true for the OS to suppor the XMM instructions
+;
+;   CR0.EM(bit 2) = 0 (emulation disabled)
+;   CR4.OSFXSR(bit 9) = 1 (OS supports saving SIMD floating-point state during context
+;                          switches)
+;
+;  * * * N O T E * * * * * * N O T E * * * * * * N O T E * * * * * * N O T E * * * * * * N O T E * * * * * * N O T E * * *
+; 
+; This function will NOT run on windows NT systems.  The function reads control registers
+; which are protected under Windows NT.  If you attempt to run this function under Windows NT a
+; protected mode access violation will be generated.
+;
+;  * * * N O T E * * * * * * N O T E * * * * * * N O T E * * * * * * N O T E * * * * * * N O T E * * * * * * N O T E * * *
+;
+; Assumptions:
+;  Access to system control registers CR0 and CR4 are not protected
+;
+; Input:
+;   None
+;
+; Output:
+;   1 Returned if OS supports XMM instructions
+;   0 Returned if OS does not support XMM instructions
+;
+;
+
+
+        .586
+        .MODEL  flat, SYSCALL, os_dos
+        .DATA 
+
+NAME x86cpuid
+
+PUBLIC Does9xOSSupportXMM_
+PUBLIC _Does9xOSSupportXMM
+
+        .CODE
+
+; int Does9xOSSupportXMM( void )
+Does9xOSSupportXMM_:
+_Does9xOSSupportXMM:
+    push    esi ;safety sh*&
+    push    edi
+    push    ebp
+    push    ebx 
+    push    ecx
+    push    edx
+
+; check to see if OS supports SIMD instructions
+    mov     edx,cr0
+    bt      edx,2                           ; ensure no emulation
+    jnae    NoXMMSupport
+
+    mov     edx,cr4
+    bt      edx,9                           ; OS support SIMD
+    jnc     NoXMMSupport
+
+; we support XMM instructions
+    mov     eax,1
+    jmp     Exit
+
+NoXMMSupport:
+;    mov     eax,0                           ; OS does not support XMM instructions
+
+Exit:
+    pop     edx ;safety sh*&
+    pop     ecx
+    pop     ebx
+    pop     ebp
+    pop     edi
+    pop     esi
+    ret
+
+;************************************************
+         END