;
; THIS SOFTWARE IS SUBJECT TO COPYRIGHT PROTECTION AND IS OFFERED ONLY
; PURSUANT TO THE 3DFX GLIDE GENERAL PUBLIC LICENSE. THERE IS NO RIGHT
; TO USE THE GLIDE TRADEMARK WITHOUT PRIOR WRITTEN PERMISSION OF 3DFX
; INTERACTIVE, INC. A COPY OF THIS LICENSE MAY BE OBTAINED FROM THE 
; DISTRIBUTOR OR BY CONTACTING 3DFX INTERACTIVE INC(info@3dfx.com). 
; THIS PROGRAM IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER 
; EXPRESSED OR IMPLIED. SEE THE 3DFX GLIDE GENERAL PUBLIC LICENSE FOR A
; FULL TEXT OF THE NON-WARRANTY PROVISIONS.  
; 
; USE, DUPLICATION OR DISCLOSURE BY THE GOVERNMENT IS SUBJECT TO
; RESTRICTIONS AS SET FORTH IN SUBDIVISION (C)(1)(II) OF THE RIGHTS IN
; TECHNICAL DATA AND COMPUTER SOFTWARE CLAUSE AT DFARS 252.227-7013,
; AND/OR IN SIMILAR OR SUCCESSOR CLAUSES IN THE FAR, DOD OR NASA FAR
; SUPPLEMENT. UNPUBLISHED RIGHTS RESERVED UNDER THE COPYRIGHT LAWS OF
; THE UNITED STATES.  
; 
; COPYRIGHT 3DFX INTERACTIVE, INC. 1999, ALL RIGHTS RESERVED
;
	
;; 
;; Assembly Function for reading the Time Stamp Counter
;;
TITLE  utsc.asm
.586P
;include listing.inc
if @Version gt 510
.model FLAT, C
else
_TEXT   SEGMENT PARA USE32 PUBLIC 'CODE'
_TEXT   ENDS
_DATA   SEGMENT DWORD USE32 PUBLIC 'DATA'
_DATA   ENDS
CONST   SEGMENT DWORD USE32 PUBLIC 'CONST'
CONST   ENDS
_BSS    SEGMENT DWORD USE32 PUBLIC 'BSS'
_BSS    ENDS
_TLS    SEGMENT DWORD USE32 PUBLIC 'TLS'
_TLS    ENDS
FLAT    GROUP _DATA, CONST, _BSS
        ASSUME  CS: FLAT, DS: FLAT, SS: FLAT
endif

; some useful floating load and store macros <ala gmt>
flds    TEXTEQU <fld  DWORD PTR>
fsubs   TEXTEQU <fsub DWORD PTR>
fmuls   TEXTEQU <fmul DWORD PTR>
fstsp   TEXTEQU <fstp DWORD PTR>

_DATA   SEGMENT
One     DD      03f800000r
Dummy   DD  ?
_DATA   ENDS

_TEXT           SEGMENT

;;  Fxu32 tscReadTSC( void ) 
;;  Reads the pentium time stamp counter and returns
;;  the low 32bits 

        align 4
    PUBLIC  tscReadTSC
    tscReadTSC PROC NEAR   

        .586
    rdtsc                   ; Read the time stamp counter 

    ret
    tscReadTSC ENDP

_TEXT ENDS
END