268 lines
6.4 KiB
NASM
268 lines
6.4 KiB
NASM
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PAGE 58,132
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;*****************************************************************************
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TITLE MMTASK.ASM - Windows MultiMedia Systems Task Stub
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;*****************************************************************************
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;
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; Copyright (C) Microsoft Corporation 1985-1990. All rights reserved.
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;
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; Title: MMTASK.asm - a windows application that acts as a
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; task stub.
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;
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; Version: 1.00
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;
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; Date: 12-Mar-1990
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;
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; Author: ROBWI
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;
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;-----------------------------------------------------------------------------
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;
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; Change log:
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;
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; DATE REV DESCRIPTION
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; ----------- --- --------------------------------------------------------
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; 12-Mar-1990 ROBWI First Version
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; 18-APR-1990 ROBWI Moved from idle.asm to mmtask.asm
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;
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;=============================================================================
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?WIN=0
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?PLM=1
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PMODE = 1
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.xlist
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include cmacros.inc
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.list
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wptr equ WORD PTR
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; The following structure should be used to access high and low
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; words of a DWORD. This means that "word ptr foo[2]" -> "foo.hi".
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LONG struc
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lo dw ?
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hi dw ?
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LONG ends
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FARPOINTER struc
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off dw ?
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sel dw ?
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FARPOINTER ends
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;----------------------------------------------------------------------
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;
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; MMTASKSTRUC : The following structure should be passed to mmtask (in
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; the command line) when it is exec'd.
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MMTASKSTRUC struc
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lpfn dd ? ; fp to function to call.
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inst dd ? ; instance data to pass to lpfn
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dwstck dd ? ; stack size.
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MMTASKSTRUC ends
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EXIT_PROCESS equ 1
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;-----------------------------------------------------------------------;
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;
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; externals from KERNEL
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externFP WaitEvent
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externFP PostEvent
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externFP OldYield
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externFP InitTask
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externFP InitApp ; to get a msg q so that we can call user
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externFP OutputDebugString
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externFP SetMessageQueue
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sBegin DATA
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assumes DS,DATA
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; Stuff needed to avoid the C runtime coming in
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DD 0 ; So null pointers get 0
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maxRsrvPtrs = 5
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DW maxRsrvPtrs
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usedRsrvPtrs = 0
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labelDP <PUBLIC,rsrvptrs>
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DefRsrvPtr MACRO name
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globalW name,0
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usedRsrvPtrs = usedRsrvPtrs + 1
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ENDM
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DefRsrvPtr pLocalHeap ; Local heap pointer
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DefRsrvPtr pAtomTable ; Atom table pointer
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DefRsrvPtr pStackTop ; top of stack
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DefRsrvPtr pStackMin ; minimum value of SP
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DefRsrvPtr pStackBot ; bottom of stack
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if maxRsrvPtrs-usedRsrvPtrs
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DW maxRsrvPtrs-usedRsrvPtrs DUP (0)
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endif
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public __acrtused
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__acrtused = 1
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loadparams DB (SIZE MMTASKSTRUC) DUP (0)
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sEnd DATA
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sBegin Code
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assumes cs, Code
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assumes ds, Data
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assumes es, nothing
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assumes ss, nothing
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;--------------------------Private-Routine-----------------------------;
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;
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; @doc INTERNAL MMTASKAPP
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;
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; @asm AppEntry | called when the APP is loaded
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;
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; @reg CX | size of heap
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; @reg DI | module handle
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; @reg DS | automatic data segment
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; @reg ES:SI | address of command line (not used)
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; @reg
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;
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; @rdesc Register values at return
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;
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; @reg AX | 1 if success, 0 if error
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;
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; @uses AX BX CX DX FLAGS
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;
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; @comm Preserves: SI DI DS BP
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;
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; Calls: None
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;
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; History:
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;
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; 06-27-89 -by- Todd Laney [ToddLa] Created shell appentry
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; routine
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; 03-13-90 -stolen- Rob Williams [RobWi] Added all kinds o'
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; stuff for making it an MMTASK application.
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;
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;-----------------------------------------------------------------------;
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cProc AppEntry,<FAR,PUBLIC,NODATA>,<>
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cBegin
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; Copy the parameters out of the command line before
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; InitTask gets a chance to modify them.
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push di
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push si
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push cx
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; switch ds and es so that we can do a string move
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; into the data segment
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push ds ; save ds o
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mov ax, es
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mov ds, ax ; ds = es 0
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pop es ; es = ds 0
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; copy the command line if it is the correct length
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mov si, 81h
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lea di, loadparams
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mov cx, SIZE MMTASKSTRUC / 2
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xor ax, ax
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mov al, byte ptr ds:[80h]
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shr ax, 1
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cmp ax, cx ; Q: structure size correct
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jne Skip_Copy ; N: Skip the copy
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.ERRNZ SIZE MMTASKSTRUC MOD 2
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cld ; Y: Copy the structure
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rep movsw
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Skip_Copy:
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; restore original es and ds
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push es
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mov ax, ds
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mov es, ax ; es = ds = es 0
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pop ds
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pop cx
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pop si
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pop di
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; pretend the command string is 0 length.
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xor ax, ax
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mov es:[80h], ax
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; initialize the task and the event queue
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cCall InitTask
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cCall InitApp, <di>
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cCall SetMessageQueue, <64>
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or ax,ax
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jz MMTASKexit
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; DX is now the CmdShow value.
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; CX is stack size.
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; event count is initially one so call waitevent to clear the event count
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cCall WaitEvent, <0>
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; check parameters
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mov dx, loadparams.lpfn.hi
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or dx, dx ; callback ok?
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jz MMTASKExit ; N: out'a here
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cCall OldYield ; be polite.
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mov ax, loadparams.inst.lo
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mov dx, loadparams.inst.hi
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cCall loadparams.lpfn, <dx, ax>
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MMTASKExit:
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ifdef DEBUG
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; lets make sure the app did not do anything evil
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cmp wptr ds:[0],0
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jne evil
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cmp wptr ds:[2],0
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jne evil
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cmp wptr ds:[4],5
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jne evil
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je not_evil
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evil:
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lea ax,evil_str
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cCall OuputDebugString, <cs,ax>
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int 3
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jmp not_evil
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evil_str:
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db "MMTASK: NULL pointer assignment! fag!",13,10,0
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not_evil:
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endif
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; before we actualy exit lets yield, so we don't re-enter
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; USERS AppExit code.....
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cCall OldYield
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cCall OldYield
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cCall OldYield
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mov ah, 4Ch
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int 21h
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cEnd
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sEnd
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end AppEntry
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