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https://github.com/KolibriOS/kolibrios.git
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69 lines
2.9 KiB
NASM
69 lines
2.9 KiB
NASM
;*****************************************************************************
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;*
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;* Open Watcom Project
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;*
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;* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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;*
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;* ========================================================================
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;*
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;* This file contains Original Code and/or Modifications of Original
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;* Code as defined in and that are subject to the Sybase Open Watcom
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;* Public License version 1.0 (the 'License'). You may not use this file
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;* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
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;* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
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;* provided with the Original Code and Modifications, and is also
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;* available at www.sybase.com/developer/opensource.
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;*
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;* The Original Code and all software distributed under the License are
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;* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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;* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
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;* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
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;* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
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;* NON-INFRINGEMENT. Please see the License for the specific language
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;* governing rights and limitations under the License.
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;*
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;* ========================================================================
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;*
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;* Description: routine for checking FPU type
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;*
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;*****************************************************************************
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include mdef.inc
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modstart init8087
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xdefp __x87id
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__x87id proc
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sub EAX,EAX
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push EAX ; allocate space for status word
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finit ; use default infinity mode
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fstcw word ptr [ESP] ; save control word
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fwait
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pop EAX
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mov AL,0
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cmp AH,3
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jnz nox87
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push EAX ; allocate space for status word
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fld1 ; generate infinity by
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fldz ; dividing 1 by 0
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fdiv ; ...
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fld st ; form negative infinity
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fchs ; ...
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fcompp ; compare +/- infinity
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fstsw word ptr [ESP] ; equal for 87/287
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fwait ; wait fstsw to complete
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pop EAX ; get NDP status word
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mov AL,2 ; assume 80287
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sahf ; store condition bits in flags
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jz not387 ; it's 287 if infinities equal
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mov AL,3 ; indicate 80387
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not387: finit ; re-initialize the 8087
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nox87: mov AH,0
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ret ; return
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__x87id endp
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endmod
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end
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