96 lines
3.7 KiB
C
96 lines
3.7 KiB
C
/*++ BUILD Version: 0002
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*
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* WOW v1.0
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*
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* Copyright (c) 1991, Microsoft Corporation
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*
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* WOWCOMM.H
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* Constants, macros, etc common to WOW16/WOW32
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*
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* History:
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* Created 28-Apr-1993 by Craig Jones (v-cjones)
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*
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*/
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#ifndef __WOWCOMM__ // has this been included before?
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#define __WOWCOMM__
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#ifndef UNALIGNED // this makes UNALIGNED visible only to 32-bit stuff
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#define UNALIGNED // and invisible to 16-bit stuff
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#endif
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/* XLATOFF */
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#pragma pack(1)
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/* XLATON */
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// COMDEB - Communications Device Equipment Block. (copied from ibmcom.inc)
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// This is essentially a superset of the DCB used outside of this
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// module. The DCB is contained within the DEB as the first fields.
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// The fields which follow are data and status fields which
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// are unique to this implementation.
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// AltQInAddr and AltQOutAddr are alternate queue pointers which are used when
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// in "supervisor" mode. Supervisor mode is a processor mode other than the
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// one which Windows normally runs in. In standard mode Windows, supervisor
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// mode is REAL mode. In enhanced mode Windows, supervisor mode is RING 0
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// protected mode. For more details see comments in IBMINT.ASM.
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// RS232 Data Equip Block
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typedef struct _COMDEB16 { /* cdeb16 */
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BYTE ComDCB; // size of this struct
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WORD ComErr; // Non-zero if I/O error
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WORD Port; // Base I/O Address
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WORD NotifyHandle;
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WORD NotifyFlags;
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WORD RecvTrigger; // char count threshold for calling
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WORD SendTrigger; // char count threshold for calling
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// The following fields are specific to com ports only
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WORD IRQhook; // ptr to IRQ_Hook_Struc
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WORD NextDEB; // ptr to next DEB that is sharing IRQ
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WORD XOffPoint; // Q count where XOff is sent
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WORD EvtMask; // Mask of events to check for
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WORD EvtWord; // Event flags
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DWORD QInAddr; // Address of the queue
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DWORD AltQInAddr; // Addr of queue in "supervisor" mode
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WORD QInSize; // Length of queue in bytes
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DWORD QOutAddr; // Address of the queue
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DWORD AltQOutAddr; // Addr of queue in "supervisor" mode
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WORD QOutSize; // Length of queue in bytes
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WORD QInCount; // Number of bytes currently in queue
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WORD QInGet; // Offset into queue to get bytes from
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WORD QInPut; // Offset into queue to put bytes in
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WORD QOutCount; // Number of bytes currently in queue
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WORD QOutGet; // Offset into queue to get bytes from
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WORD QOutPut; // Offset into queue to put bytes in
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BYTE EFlags; // Extended flags
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BYTE MSRShadow; // Modem Status Register Shadow
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BYTE ErrorMask; // Default error-checking mask
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BYTE RxMask; // Character mask
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BYTE ImmedChar; // Char to be transmitted immediately
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BYTE HSFlag; // Handshake flag
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BYTE HHSLines; // 8250 DTR/RTS bits for handshaking
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BYTE OutHHSLines; // Lines that must be high to output
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BYTE MSRMask; // Mask of Modem Lines to check
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BYTE MSRInfinite; // Mask of MSR lines that must be high
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BYTE IntVecNum; // Interrupt vector number
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BYTE LSRShadow; // Line Status Register shadow
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WORD QOutMod; // Characters sent mod xOnLim ENQ/ETX [rkh]
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DWORD VCD_data;
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BYTE VCDflags;
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BYTE MiscFlags; // still more flags
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} COMDEB16;
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typedef COMDEB16 UNALIGNED *PCOMDEB16;
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// In 3.0 MSRShadow had this relationship to EvtWord and major COM apps all
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// use this offset of 35 to get to MSRShadow so that they can determine the
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// current status of the Modem Status bits. We need to maintain this offset
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// so that these apps will continue to run.
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/* XLATOFF */
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#pragma pack()
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/* XLATON */
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#endif // __WOWCOMM__
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