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  1. ;*****************************************************************************
  2. ;*
  3. ;*                            Open Watcom Project
  4. ;*
  5. ;*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
  6. ;*
  7. ;*  ========================================================================
  8. ;*
  9. ;*    This file contains Original Code and/or Modifications of Original
  10. ;*    Code as defined in and that are subject to the Sybase Open Watcom
  11. ;*    Public License version 1.0 (the 'License'). You may not use this file
  12. ;*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
  13. ;*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
  14. ;*    provided with the Original Code and Modifications, and is also
  15. ;*    available at www.sybase.com/developer/opensource.
  16. ;*
  17. ;*    The Original Code and all software distributed under the License are
  18. ;*    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  19. ;*    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
  20. ;*    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
  21. ;*    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
  22. ;*    NON-INFRINGEMENT. Please see the License for the specific language
  23. ;*    governing rights and limitations under the License.
  24. ;*
  25. ;*  ========================================================================
  26. ;*
  27. ;* Description:  routine for checking FPU type
  28. ;*
  29. ;*****************************************************************************
  30.  
  31.  
  32. include mdef.inc
  33.  
  34.         modstart init8087
  35.  
  36.         xdefp   __x87id
  37.  
  38. __x87id proc
  39.         sub     EAX,EAX
  40.         push    EAX                     ; allocate space for status word
  41.         finit                           ; use default infinity mode
  42.         fstcw   word ptr [ESP]          ; save control word
  43.         fwait
  44.         pop     EAX
  45.         mov     AL,0
  46.         cmp     AH,3
  47.         jnz     nox87
  48.         push    EAX                     ; allocate space for status word
  49.         fld1                            ; generate infinity by
  50.         fldz                            ;   dividing 1 by 0
  51.         fdiv                            ; ...
  52.         fld     st                      ; form negative infinity
  53.         fchs                            ; ...
  54.         fcompp                          ; compare +/- infinity
  55.         fstsw   word ptr [ESP]          ; equal for 87/287
  56.         fwait                           ; wait fstsw to complete
  57.         pop     EAX                     ; get NDP status word
  58.         mov     AL,2                    ; assume 80287
  59.         sahf                            ; store condition bits in flags
  60.         jz      not387                  ; it's 287 if infinities equal
  61.         mov     AL,3                    ; indicate 80387
  62. not387: finit                           ; re-initialize the 8087
  63. nox87:  mov     AH,0
  64.         ret                             ; return
  65. __x87id endp
  66.  
  67.         endmod
  68.         end
  69.