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FPInit.asm
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Assembly Source File
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1992-11-08
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1KB
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68 lines
**
** MandelSquare - AmigaDOS 2.0/3.0 Mandelbrot set explorer
**
** FPInit.asm, fpu setup/cleanup routines
**
** Copyright ⌐ 1991-1992 by Olaf `Olsen' Barthel
** All Rights Reserved
**
include "exec/types.i"
include "exec/execbase.i"
CALL macro
xref _LVO\1
jsr _LVO\1(a6)
endm
XDEF ___fpinit
XDEF ___fpterm
XREF __XCEXIT
csect text,0,0,1,2
; VOID __fpinit(VOID);
;
; This routine is called by the c.o startup code
; in order to set up and initialize math libraries or, just
; like done here, to check for the presence of an
; '881/'882/'040 chip.
___fpinit:
move.l (4).w,a6 ; Grab SysBase
cmp.w #37,LIB_VERSION(a6) ; Kickstart 2.x?
blt.s 2$
move.w AttnFlags(a6),d0 ; Get attention flags
IFND M68040
btst #AFB_68020,d0 ; '020 or higher installed?
beq.s 2$
btst #AFB_68881,d0 ; '881 or higher installed?
bne.s 1$
ENDC
btst #AFB_68040,d0 ; If no '881 present, an '040
beq.s 2$ ; will do as well
1$ rts
2$ move.l #1,-(sp) ; Exit & fail
jmp __XCEXIT
; VOID __fpexit(VOID);
;
; This routine is called by the c.o startup code
; in order to close and release math libraries or. In this
; case it does not do anything.
___fpterm:
rts
end