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979 lines
18 KiB
979 lines
18 KiB
page ,132
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subttl emdos.asm - Initialization and Termination
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;***
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;emdos.asm - Initialization and Termination
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;
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; Copyright (c) 1987-89, Microsoft Corporation
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;
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;Purpose:
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; Initialization and Termination
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;
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; This Module contains Proprietary Information of Microsoft
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; Corporation and should be treated as Confidential.
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;
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;Revision History: (Also see emulator.hst)
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;
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; 12-10-89 WAJ Added MTHREAD DS == 0 check.
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;
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;*******************************************************************************
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comment !
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DOS interfaces to emulator/8087 functions
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Certain emulator/8087 functions are performed by calling __fpmath
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with an function code and arguments.
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__fpmath general floating point math package interface used
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by the emulator/8087 and float calls interfaces. This
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is a far routine and must be far called.
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entry:
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bx = 0 initialize floating point math
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dx:ax = task data area (dx = segment , ax = size)
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extra size is used to increase floating point stack
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(can pass segmented address of __fptaskdata in dx:ax)
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si = environment segment
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returns:
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ax = 0 if successful and using software floating point
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1 if successful and using 8087
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negative if error
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bx = 1 reset (FINIT)
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bx = 2 terminate floating point math
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bx = 3 set error signal address
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dx:ax = segment:offset of user error handler
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bx = 4 load user control word
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(user should not use FLDCW instruction directly)
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ax = user control word value
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bx = 5 store user control word
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returns:
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ax = user control word value
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bx = 6 truncate TOS to integer TOS
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ax = user control word (only use round mode)
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bx = 7 truncate TOS to 32-bit integer in DX:AX
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ax = user control word (only use round mode)
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bx = 8 store user status word
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returns:
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ax = user status word value
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bx = 9 clear exceptions
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bx = 10 return number of stack elements in ax
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bx = 11 returns 1 if using 80x87, 0 if not
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bx = 12 if ax = 0, turn off extended stack. if ax = 1, turn on e.s.
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QB3 version
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bx = 0 init, ax = initCW, es = PSP
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bx = 1 reset
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bx = 2 term
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bx = 3 set vectors
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bx = 4 reset vectors
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!
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glb <functab>
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functab label word
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dw initialization ; 0 - initialize emulator/8087
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dw reset ; 1 - reset emulator/8087 stack
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dw termination ; 2 - terminate emulator/8087
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ifdef QB3
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dw set_vectors ; 3 - set interrupt vectors
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dw rst_vectors ; 4 - reset interrupt vectors
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SizeJmpTab equ 4
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else ;not QB3
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dw setsignal ; 3 - set error signal address
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dw loadcontrolword ; 4 - load user control word
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dw storecontrolword ; 5 - store user control word
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dw truncateTOS ; 6 - truncate TOS to integer TOS
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dw truncateTOSto32int ; 7 - truncate TOS to integer in DX:AX
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dw storestatusword ; 8 - store user status word
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dw clearexceptions ; 9 - clear execeptions
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dw NumStack ; 10 - report number of elements in stack
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dw ReturnHave8087 ; 11 - report if using coprocessor
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dw SetExtendedStack ; 12 - turn on or off extended stack
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SizeJmpTab equ 12
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endif ;not QB3
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endfunc label word
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szfunctab= endfunc - functab
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public __fpmath ; emulator entry point
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; (if linked with user program)
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__fpmath proc far
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cmp bx, SizeJmpTab
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ja RetFPErr
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shl bx,1
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push ds ; save DS
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ifdef QB3
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push es
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push ax
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push cx
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push dx
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push si
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push di
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endif
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ifdef MTHREAD
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or bx,bx ; check for initialization
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jz callfunc ; yes - skip set up of ds
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push ax ; preserve AX = __fpmath argument
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LOADthreadDS ; macro in emthread.asm
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; loads thread's DS; trashes AX
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mov ax, ds
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or ax, ax ; check for DS of zero.
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pop ax
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jz FPMathRet
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callfunc:
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else ;MTHREAD
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ifdef standalone
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xor cx,cx
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mov ds,cx
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mov ds,ds:[TSKINT*4+2] ; point to task data area
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elseifdef _COM_
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mov ds, [__EmDataSeg]
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else
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mov cx, edataBASE
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mov ds,cx
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endif ;standalone
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endif ;MTHREAD
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call functab[bx]
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ifdef QB3
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pop di
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pop si
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pop dx
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pop cx
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pop ax
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pop es
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endif
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lab FPMathRet
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pop ds ; restore DS
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pub emuret
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ret
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RetFPErr:
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or ax, -1
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mov dx, ax
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jmp emuret
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__fpmath endp
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|
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ProfBegin DOS
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|
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subttl emdos.asm - Initialization and Termination
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page
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;*********************************************************************;
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; ;
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; Initialization and Termination ;
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; ;
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;*********************************************************************;
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wastetime macro
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push cx
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mov cx,20 ;; wait for a short time
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loop $
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pop cx
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endm
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ifndef only87
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CHIPKEY db 'NO87='
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CHIPKEYLEN equ $ - CHIPKEY
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crlf db 13,10
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endif ;only87
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ifdef standalone
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Installed db 0 ; installation flag
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pub sizeerror
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mov ax,-1 ; return size error
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stc
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ret
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endif ;standalone
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|
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; initialization
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;
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; entry dx:ax = task data area (segment and size) for standalone
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; si = DOS environment segment for NO87 lookup
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pub initialization
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ifdef QB3
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mov [initCW],ax ; save initial BASIC control word
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endif
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setstacklimits macro
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mov di,offset BEGstk ; di = base of register stack
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mov [BASstk],di ; initialize stack base
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mov cx,Reg87Len ; cx = register length
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xchg ax,dx ; ax = task data segment size
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sub ax,di ; ax = number bytes for stack
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cwd ; dx:ax = number of bytes
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div cx ; ax = number of entries
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mul cx ; ax = number of bytes
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add ax,di ; ax = top of stack
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sub ax,cx ; Leave room for one on overflow
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mov [LIMstk],ax ; set top of stack
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endm
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ifdef standalone
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; check task data area sizes for correctness
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cmp ax,offset __fptaskdata ; compare against minimum size
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jb sizeerror ; too small
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mov ds,dx ; set up task data segment
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xchg dx,ax ; set up size
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mov ax,25h*256 + TSKINT ; set TASK DATA pointer vector
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int 21h
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setstacklimits
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endif ;standalone
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ifdef MTHREAD
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ALLOCthreadDS ; macro in emthread.asm
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mov dx,(offset __fptaskdata)-cvtbufsize
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; set up size in dx
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; cvt buf not part of stack
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setstacklimits
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endif ;MTHREAD
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ifdef QP
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mov ax, edataOFFSET BEGstk ; initialize BASstk, CURstk, LIMstk
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mov [BASstk], ax ; QuickPascal has no data initialization
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mov [CURstk], ax
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mov ax, edataOFFSET ENDstk
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sub ax, 2*Reg87Len
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mov [LIMstk], ax
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endif ;QP
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ifndef frontend
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ifdef DOS5
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push ss ; current stack segment selector
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push ds
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mov ax,offset SSalias
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push ax ; address of SSalias
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os2call DOSCREATECSALIAS ; get SS alias for exception handling
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endif ;DOS5
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endif ;frontend
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ifdef DOS3and5
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push ds
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mov ax,offset protmode
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push ax
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os2call DOSGETMACHINEMODE ; get machine mode flag
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endif ;DOS3and5
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ifdef MTHREAD
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mov ax,ds
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cmp ax,EMULATOR_DATA ; check for thread 1
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je initcheckenv ; yes - go look for NO87=
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|
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; other threads should copy thread 1's Have8087 value
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; and then go to initfinish
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|
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push ds
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mov ax,EMULATOR_DATA
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mov ds,ax
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mov al,[Have8087]
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pop ds
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mov [Have8087],al
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jmp initfinish
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endif ;MTHREAD
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pub initcheckenv
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ifdef frontend
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mov [Have8087],0 ; indicate no 8087
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else
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ifndef only87
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push ds
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|
; Examine the environment looking for the NO87= switch
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or si,si ; check for no environment passed in
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je init1 ; don't look for NO87=
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mov es,si ; ES = environment segment
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push cs
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pop ds
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xor di,di ; DI -> 1st byte of environment
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cld
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|
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pub envstart
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cmp byte ptr es:[di],0 ; 1st byte zero means end of env.
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je init1 ; continue with initialization
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mov cx,CHIPKEYLEN ; Length of key 'NO87='
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mov si,offset CHIPKEY ; key string address
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repe cmpsb
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je envwrtmsg
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mov cx,7FFFh ; Scan rest of environment
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xor al,al ; for 0
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repne scasb
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je envstart ; yes - check next entry
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jmp short init1 ; UNDONE - bad environment if here
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pub envwrtmsg
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mov cx,7FFFh
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mov al,' ' ; skip leading blanks
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repe scasb
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dec di
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mov dl,es:[di] ; Get character of message
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or dl,dl ; Do we have a null?
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jz envmsgend ; If so we're done
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|
|
pub envwrtlp
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xor ax,ax ;** vvv ; scan for a null byte
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mov cx,7FFFh
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mov bx,di ; save offset of string
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repne scasb
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dec di
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sub di,bx
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mov cx,di ; count of characters before null byte
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;
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|
; write out NO87= environment string to standard output
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;
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|
|
|
ifdef DOS5
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mov di,bx ; restore offset of string
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push ax
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mov ax,sp ; allocate space for return count
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|
mov bx,1
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push bx ; file handle (standard output)
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|
push es
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|
push di ; address of buffer
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push cx ; number of bytes to write
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push ss
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|
push ax ; address for return count
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|
os2call DOSWRITE
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|
|
;
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|
; write out CR-LF pair to standard output
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|
;
|
|
mov ax,sp ; pointer to space for return count
|
|
|
|
mov bx,1
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|
push bx ; file handle (standard output)
|
|
push cs
|
|
mov di,offset crlf
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|
push di ; address of CR-LF pair
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|
mov bx,2
|
|
push bx ; number of bytes to write: 2
|
|
push ss
|
|
push ax ; address for return count
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|
os2call DOSWRITE
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pop bx ;** ^^^ ; deallocate space for return count
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else
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push es
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|
pop ds
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mov dx,bx ; ds:dx = string
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|
mov bx,1 ; bx = file handle (1)
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mov ah,40H
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int 21h ; call DOS - write string
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|
|
push cs
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|
pop ds
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|
mov dx,offset crlf ; ds:dx = CR/LF
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mov cx,2 ; cx = 2 bytes
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mov ah,40H
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int 21h ; call DOS - write string
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endif
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|
|
|
pub envmsgend
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pop ds ; restore user data area
|
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mov [Have8087],0 ; indicate emulation
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ifdef _NO87INSTALL
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jmp initinstallno87 ; go call __FPINSTALLNO87
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else ;_NO87INSTALL
|
|
jmp initvec ; initialize for emulation
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|
endif ;_NO87INSTALL
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|
|
pub init1
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pop ds ; restore user data area
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|
|
|
endif ;only87
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|
|
|
|
|
; check if 8087/80287 is present
|
|
|
|
ifdef DOS3and5
|
|
cmp [protmode],0 ; check for protect mode
|
|
jne prot287chk ; yes - check for 287
|
|
endif ;DOS3and5
|
|
|
|
ifdef DOS3
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|
|
|
; real mode 8087/80287 check
|
|
|
|
ifdef PCDOS
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|
PCBIOSEQ equ 11H ; PC BIO's Equipment determination call.
|
|
COPROCESSORMASK equ 2H ; Mask for Coprocessor sense switch.
|
|
|
|
int PCBIOSEQ ; PC-DOS Bios Equipment
|
|
and al,COPROCESSORMASK ; Coprocessor present?
|
|
shr al,1 ; al = 0 if no 8087/80287 , 1 = if yes
|
|
ifdef only87
|
|
jz installerror ; error if no 8087/80287
|
|
endif ;only87
|
|
else
|
|
fninit ; Initialize the 8087.
|
|
wastetime
|
|
xor ax,ax ; Clean AX.
|
|
mov [statwd],ax ; Clear temporary.
|
|
fnstcw [statwd] ; have bits 033Fh set if 8087
|
|
wastetime
|
|
and [statwd],0F3Fh ; (was 1F3Fh, but now allows for 80387-A1 step)
|
|
cmp [statwd],033Fh
|
|
jnz realno87 ; no 8087 or 287
|
|
|
|
; 80287 can fool you - also check for status word
|
|
|
|
fnstsw [statwd] ; save status word
|
|
wastetime
|
|
inc ax ; al = 1 (assume have an 80287)
|
|
test [statwd],0B8BFh ; should be off if present
|
|
|
|
pub realno87
|
|
jz realhave87
|
|
ifdef only87
|
|
jmp short installerror ; error if no 8087/80287
|
|
else
|
|
xor ax,ax ; al = 0
|
|
endif ;only87
|
|
|
|
pub realhave87
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|
endif ;PCDOS
|
|
|
|
MOV [Have8087],al
|
|
endif ;DOS3
|
|
|
|
ifdef DOS3and5
|
|
jmp short initinstall
|
|
endif ;DOS3and5
|
|
|
|
ifdef DOS5
|
|
|
|
; protect mode 80287 check
|
|
|
|
pub prot287chk
|
|
push ds
|
|
|
|
.286
|
|
push offset Have8087 ; directly change Have8087
|
|
push 3 ; 3rd byte is coprocessor flag
|
|
push 0 ; reserved parameter
|
|
|
|
ifndef DOS5only
|
|
.8086
|
|
endif
|
|
|
|
os2call DOSDEVCONFIG
|
|
ifdef only87
|
|
cmp [Have8087],0 ; error if no 87 present
|
|
je installerror
|
|
endif ;only87
|
|
endif ;DOS5
|
|
|
|
endif ;frontend
|
|
|
|
|
|
; check if floating point emulator/8087 already installed (device driver)
|
|
|
|
pub initinstall
|
|
|
|
ifndef QB3
|
|
|
|
ifndef frontend
|
|
ifndef only87
|
|
cmp [Have8087],0 ; check for 8087/80287
|
|
ifdef _NO87INSTALL
|
|
jne initcontinue
|
|
pub initinstallno87
|
|
extrn __FPINSTALLNO87:near
|
|
call __FPINSTALLNO87
|
|
jmp initvec
|
|
initcontinue:
|
|
else ;_NO87INSTALL
|
|
je initvec ; no - don't install hardware
|
|
endif ;_NO87INSTALL
|
|
endif ;only87
|
|
|
|
ifdef DOS3and5
|
|
cmp [protmode],0 ; check for protect mode
|
|
jne initprotinstall ; yes - don't install hardware
|
|
endif ;DOS3and5
|
|
ifdef DOS5only
|
|
jmp initprotinstall
|
|
endif
|
|
|
|
ifdef DOS3
|
|
ifdef standalone
|
|
cmp [Installed],0 ; note - in code segment (not task)
|
|
jnz initvec ; installed - skip installation
|
|
endif ;standalone
|
|
|
|
extrn __FPINSTALL87:near
|
|
call __FPINSTALL87 ; OEM installation
|
|
jnc initvec
|
|
|
|
endif ;DOS3
|
|
|
|
pub installerror
|
|
mov ax,-2 ; return installation error
|
|
stc
|
|
ret
|
|
|
|
|
|
ifdef DOS5
|
|
pub initprotinstall
|
|
|
|
.286
|
|
push 16 ; exception error
|
|
push cs
|
|
push offset protexception
|
|
push ds
|
|
push offset oldvec+4 ; address for old exception vector
|
|
|
|
ifndef DOS5only
|
|
.8086
|
|
endif
|
|
os2call DOSSETVEC
|
|
endif ;DOS5
|
|
endif ;frontend
|
|
|
|
endif ;QB3
|
|
|
|
; set up interrupt vectors for emulator or fixup-on-the-fly
|
|
|
|
pub initvec
|
|
|
|
ifdef DOS3and5
|
|
cmp [protmode],0
|
|
jne initvecprot ; yes - protect mode setup
|
|
endif ;DOS3and5
|
|
|
|
ifdef DOS3
|
|
; real mode emulation and fixup on the fly vector setup
|
|
|
|
ifndef QB3
|
|
call set_vectors
|
|
endif
|
|
|
|
|
|
endif ;DOS3
|
|
ifdef DOS3and5
|
|
jmp short initfinish
|
|
endif
|
|
|
|
ifdef DOS5
|
|
pub initvecprot
|
|
ifndef only87
|
|
cmp [Have8087],0 ; emulation?
|
|
jne initfinish ; no - don't setup vector
|
|
|
|
.286
|
|
push 7 ; emulation
|
|
push cs
|
|
push offset protemulation
|
|
push ds
|
|
push offset oldvec ; address for old emulation vector
|
|
|
|
ifndef DOS5only
|
|
.8086
|
|
endif
|
|
os2call DOSSETVEC
|
|
endif ;only87
|
|
endif ;DOS5
|
|
|
|
; finish initialization
|
|
|
|
pub initfinish
|
|
|
|
call reset ; reset (0), FINIT if 8087 present
|
|
|
|
ifdef QB3
|
|
mov ax,[initCW]
|
|
else
|
|
mov ax,InitControlWord ; setup initial control word
|
|
endif
|
|
call loadcontrolword
|
|
|
|
ifndef QB3
|
|
xor ax,ax
|
|
mov word ptr [SignalAddress],ax ; clear SignalAddress
|
|
mov word ptr [SignalAddress+2],ax
|
|
endif
|
|
|
|
ifdef MTHREAD
|
|
mov [ExtendStack],1
|
|
endif ;MTHREAD
|
|
|
|
|
|
ifndef only87
|
|
ifdef LOOK_AHEAD
|
|
ifdef DOS3and5
|
|
mov ax, offset DOSLookAhead
|
|
cmp [protmode], 0
|
|
je SetLookAheadRoutine
|
|
|
|
mov ax, offset ProtLookAhead
|
|
SetLookAheadRoutine:
|
|
mov [LookAheadRoutine], ax
|
|
|
|
endif ;DOS3and5
|
|
endif ;LOOK_AHEAD
|
|
endif ;not only87
|
|
|
|
|
|
mov al,[Have8087]
|
|
cbw ; ax = 0 or 1 depending on 8087
|
|
ret
|
|
|
|
ifdef MTHREAD
|
|
lab LoadDS_EDI ; this is used from emds.asm
|
|
push bx
|
|
push cx
|
|
push dx
|
|
|
|
mov bx, DGROUP
|
|
mov ds, bx
|
|
|
|
call __FarGetTidTab
|
|
mov ds, dx
|
|
mov di, ax
|
|
add di, __fpds
|
|
|
|
pop dx
|
|
pop cx
|
|
pop bx
|
|
|
|
ret
|
|
endif ;MTHREAD
|
|
|
|
|
|
;------ termination ----------------------------------------------------
|
|
|
|
pub termination
|
|
|
|
ifdef DOS3and5
|
|
cmp [protmode],0 ; are we in protect mode?
|
|
jne termprot ; yes
|
|
endif ;DOS3and5
|
|
|
|
ifdef DOS3
|
|
; real mode termination
|
|
|
|
ifndef QB3
|
|
call rst_vectors
|
|
endif
|
|
|
|
ifndef frontend
|
|
ifndef only87
|
|
cmp [Have8087],0 ; Non zero if 8087 chip exists
|
|
ifdef _NO87INSTALL
|
|
jne termcontinue
|
|
extrn __FPTERMINATENO87:near
|
|
call __FPTERMINATENO87
|
|
ret
|
|
termcontinue:
|
|
else ;_NO87INSTALL
|
|
je termrealdone
|
|
endif ;_NO87INSTALL
|
|
endif ;only87
|
|
|
|
FNINIT ; Clean up 8087.
|
|
|
|
ifndef QB3
|
|
extrn __FPTERMINATE87:near
|
|
call __FPTERMINATE87 ; OEM 8087 cleanup routine
|
|
endif
|
|
|
|
endif ;frontend
|
|
|
|
pub termrealdone
|
|
ret
|
|
endif ;DOS3
|
|
|
|
ifdef DOS5
|
|
; protect mode termination
|
|
|
|
pub termprot
|
|
|
|
; UNDONE - don't do any cleanup - should be handled by DOS
|
|
|
|
ifndef frontend ; UNDONE - should not be needed
|
|
push [SSalias]
|
|
os2call DOSFREESEG ; free up SSalias
|
|
endif ;frontend
|
|
|
|
ifdef MTHREAD
|
|
FREEthreadDS ; defined in emthread.asm
|
|
; uses DOSFREESEG
|
|
endif ;MTHREAD
|
|
|
|
ret
|
|
endif ;DOS5
|
|
|
|
|
|
|
|
subttl emdos.asm - reset and clearexceptions
|
|
page
|
|
;*********************************************************************;
|
|
; ;
|
|
; Reset and Clearexceptions ;
|
|
; ;
|
|
;*********************************************************************;
|
|
|
|
pub reset
|
|
|
|
ifndef frontend
|
|
ifndef only87
|
|
cmp [Have8087],0 ; Nonzero if 8087 chip exists
|
|
je noFINIT
|
|
endif ;only87
|
|
FNINIT ; Initialize 8087.
|
|
endif ;frontend
|
|
|
|
pub noFINIT
|
|
mov ax,[BASstk]
|
|
mov [CURstk],ax ; reset stack to bottom
|
|
|
|
; fall into clearexceptions
|
|
|
|
|
|
pub clearexceptions
|
|
|
|
xor ax,ax
|
|
ifndef frontend
|
|
ifndef only87
|
|
cmp al,[Have8087] ; Nonzero if 8087 chip exists
|
|
je noFCLEX
|
|
endif ;only87
|
|
FCLEX ; clear exceptions
|
|
endif ;frontend
|
|
|
|
pub noFCLEX
|
|
ifndef only87
|
|
mov [StatusWord],ax ; clear status word
|
|
endif ;only87
|
|
mov [UserStatusWord],ax ; clear exception status word
|
|
|
|
ifdef QB3
|
|
mov ax,[initCW]
|
|
call loadcontrolword ; reload 8087 control word
|
|
endif ;QB3
|
|
|
|
ret
|
|
|
|
|
|
|
|
subttl emdos.asm - setsignal ---------------------------------
|
|
page
|
|
;*********************************************************************;
|
|
; ;
|
|
; Setsignal ;
|
|
; ;
|
|
;*********************************************************************;
|
|
|
|
ifndef QB3
|
|
|
|
pub setsignal
|
|
mov word ptr [SignalAddress],ax ; set offset
|
|
mov word ptr [SignalAddress+2],dx ; set segment
|
|
ret
|
|
|
|
endif ;QB3
|
|
|
|
|
|
ifdef DOS3
|
|
|
|
pub set_vectors
|
|
|
|
mov cx,NUMVEC ; save old vectors under DOS 3
|
|
mov ax,35h*256 + BEGINT ; get vector
|
|
mov di,offset oldvec ; di = old vector table
|
|
pub getvecs
|
|
int 21h
|
|
inc ax
|
|
mov [di],bx ; save old vector
|
|
mov [di+2],es
|
|
add di,4
|
|
loop getvecs
|
|
|
|
ifndef only87
|
|
mov dx,offset DStrap ; assume emulator
|
|
mov si,offset SOtrap
|
|
mov di,offset FWtrap
|
|
endif ;only87
|
|
|
|
ifndef frontend
|
|
ifndef only87
|
|
cmp [Have8087],0 ; are we using 8087 ?
|
|
jz setvectors ; no - go ahead and set them
|
|
endif ;only87
|
|
|
|
mov dx,offset DSFixUpOnFly ; set up for fixup-on-the-fly
|
|
mov si,offset SOFixUpOnFly
|
|
mov di,offset FWFixUpOnFly
|
|
endif ;frontend
|
|
|
|
pub setvectors
|
|
push ds
|
|
|
|
push cs
|
|
pop ds
|
|
mov ax,25h*256 + BEGINT
|
|
mov cx,8 ; 8 vectors for DStrap
|
|
pub vecloop
|
|
int 21h ; set vector
|
|
inc ax ; bump to next one
|
|
loop vecloop
|
|
|
|
mov dx,si ; set Segtrap
|
|
int 21h
|
|
inc ax
|
|
mov dx,di ; set FWtrap
|
|
int 21h
|
|
|
|
pop ds ; restore task data area
|
|
|
|
ret
|
|
|
|
|
|
pub rst_vectors
|
|
|
|
mov cx,NUMVEC
|
|
mov ax,25h*256 + BEGINT ; set vector
|
|
mov di,offset oldvec ; di = old vector table
|
|
|
|
pub termresetvecs
|
|
push ds
|
|
lds dx,[di] ; get old vector value
|
|
int 21h
|
|
pop ds
|
|
inc ax
|
|
add di,4
|
|
loop termresetvecs
|
|
|
|
ret
|
|
|
|
|
|
endif ;DOS3
|
|
|
|
|
|
|
|
pub NumStack ; returns the number of stack elements in ax
|
|
|
|
xor dx, dx ; dx will count nonzero elements
|
|
|
|
ifndef only87
|
|
cmp Have8087, 0
|
|
je CountEmulatorStack
|
|
endif ;only87
|
|
|
|
sub sp, 14 ; need 14 bytes for fstenv
|
|
mov bx, sp
|
|
fstenv ss:[bx]
|
|
fldcw ss:[bx] ; reset control word
|
|
mov ax, ss:[bx+4] ; put tag word in ax
|
|
add sp, 14 ; reset stack
|
|
|
|
mov cx, 8
|
|
pub NotEmptyLoop
|
|
mov bx, ax
|
|
|
|
shr ax, 1
|
|
shr ax, 1
|
|
|
|
and bx, 3
|
|
cmp bx, 3
|
|
je StackEntryEmpty
|
|
|
|
inc dx ; stack element was not empty
|
|
pub StackEntryEmpty
|
|
loop NotEmptyLoop
|
|
|
|
|
|
pub CountEmulatorStack
|
|
|
|
mov ax, CURstk
|
|
sub ax, BASstk
|
|
|
|
mov bl, Reg87Len
|
|
|
|
div bl
|
|
|
|
add ax, dx ; add elements on 80x87 stack
|
|
|
|
ret
|
|
|
|
|
|
ReturnHave8087 proc near
|
|
|
|
mov al, [Have8087]
|
|
cbw
|
|
|
|
ret
|
|
ReturnHave8087 endp
|
|
|
|
|
|
SetExtendedStack proc near
|
|
|
|
mov [ExtendStack], ax
|
|
|
|
ret
|
|
SetExtendedStack endp
|
|
|
|
ProfEnd DOS
|