135 lines
3.3 KiB
NASM
135 lines
3.3 KiB
NASM
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; Copyright (c) 1998 Microsoft Corporation
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;;MMDEVLDR.ASM
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page ,132
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;-----------------------------Module-Header-----------------------------;
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;
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; @Doc DMusic16
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;
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; @Module MMDevLdr.asm - Interface routines for MMDevLdr |
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;
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;-----------------------------------------------------------------------;
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?PLM = 1
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?WIN = 0
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PMODE = 1
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.xlist
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include cmacros.inc
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include windows.inc
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include mmdevldr.inc
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include mmsystem.inc
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.list
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externFP AllocCStoDSAlias ;(UINT sel);
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externFP FreeSelector ;(UINT sel);
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;
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; equates
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;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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OFFSEL struc
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off dw ?
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sel dw ?
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OFFSEL ends
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GetDeviceAPI EQU 1684h ; int 2Fh query
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;
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; segmentation
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;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;createSeg %SEGNAME, CodeSeg, word, public, CODE
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;
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; code segment
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;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; Remember, we are still 16bit.
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.model medium
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.386
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;sBegin CodeSeg
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.code
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; assumes cs, _text
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MMDEVLDR_Entry dd ? ; the api entry point for mmdevldr
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;
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; @func BOOL CDECL | SetWin32Event | Set a Win32 event from any context
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;
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; @comm
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;
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; Given the VxD handle to an event, set the event. This function calls the MMDevLdr
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; VxD API entry, which in turn calls the VWin32 function to perform the set.
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;
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; @rdesc
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; Returns TRUE on success, or FALSE if MMDevLdr could not be found.
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;
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; @parm DWORD | dwRing0Event | The VxD handle of the event as returned
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; from the <f OpenVxDHandle> kernel API.
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;
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;
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cProc _SetWin32Event <FAR, CDECL, PUBLIC> <>
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ParmD dwRing0Evt
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cBegin nogen
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mov dx, MMDEVLDR_API_SetEvent
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jmp short MMDEVLDR_Call
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cEnd nogen
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;
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;
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;
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cProc MMDEVLDR_Call <FAR, CDECL> <>
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cBegin nogen
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mov ecx, [MMDEVLDR_Entry]
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jecxz short mmdevldr_load
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jmp [MMDEVLDR_Entry]
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mmdevldr_load:
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push dx ; save MMDEVLDR command ID
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push di
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push si
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cCall AllocCStoDSAlias, <cs>
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mov si, ax
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xor di, di ; zero ES:DI before call
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mov es, di
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mov ax, GetDeviceAPI ; get device API entry point
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mov bx, MMDEVLDR_Device_ID ; virtual device ID
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int 2Fh ; call WIN/386 INT 2F API
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mov ax, es
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mov es, si
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; assumes es, CodeSeg
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mov es:MMDEVLDR_Entry.off, di
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mov es:MMDEVLDR_Entry.sel, ax
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assumes es, nothing
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push ax
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cCall FreeSelector, <si>
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pop ax
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or ax, di
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pop si
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pop di
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pop dx
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jz short mmdevldr_fail
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jmp [MMDEVLDR_Entry]
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mmdevldr_fail:
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mov ax, MMSYSERR_NODRIVER;
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retf
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cEnd nogen
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;sEnd CodeSeg
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end
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