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265 lines
9.9 KiB
265 lines
9.9 KiB
DEBUG equ 1
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No_DOSX_Bimodal_Services = 1
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IFDEF No_DOSX_Bimodal_Services
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%OUT generating code to handle ints without Bimodal Interrupt Services for DOSX
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ENDIF
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wo equ word ptr
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by equ byte ptr
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MAXLPT equ 2 ;3 LPTs supported (LPT1,2,3)
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MAXCOM equ 3 ;4 COMs supported (COM1,2,3,4)
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RS232B equ 0h ;RS232 Card(s) I/O addr 40:Save area.
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LPTB equ 8h ;LPT Card(s) I/O addr 40:Save area.
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IRQ3 equ 0bh ; Int vector for Com card @ 2xxh
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IRQ4 equ 0ch ; Int vector for Com card @ 3xxh
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INTA0 equ 20h ;X'20' 8259 Interrupt Control Port
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INTA1 equ 21h ;X'21' 8259 Interrupt Mask Port
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EOI equ 20h ;X'20' 8259 End-of-Interrupt ack
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Open equ 0201h ;Int 2F open request
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Close equ 0202h ;Int 2F close request
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Lock2F equ 0203h ;Int 2F lock request
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Unlock2F equ 0204h ;Int 2F unlock request
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; COMDEB - Communications Device Equipment Block.
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;
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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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;
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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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ComDEB struc ;RS232 Data Equip Block
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ComDCB db ((DCBSize+1) and 0FFFEh) DUP (0)
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ComErr dw 0 ;Non-zero if I/O error
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Port dw 0 ;Base I/O Address
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NotifyHandle dw 0
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NotifyFlags dw 0
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RecvTrigger dw -1 ; char count threshold for calling
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SendTrigger dw 0 ; char count threshold for calling
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; The following fields are specific to com ports only
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IRQhook dw 0 ; ptr to IRQ_Hook_Struc
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NextDEB dw 0 ; ptr to next DEB that is sharing IRQ
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XOffPoint dw 0 ;Q count where XOff is sent
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EvtMask dw 0 ;Mask of events to check for
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EvtWord dw 0 ;Event flags
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QInAddr dd 0 ;Address of the queue
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AltQInAddr dd 0 ; Addr of queue in "supervisor" mode
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QInSize dw 0 ;Length of queue in bytes
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QOutAddr dd 0 ;Address of the queue
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AltQOutAddr dd 0 ; Addr of queue in "supervisor" mode
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QOutSize dw 0 ;Length of queue in bytes
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QInCount dw 0 ;Number of bytes currently in queue
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QInGet dw 0 ;Offset into queue to get bytes from
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QInPut dw 0 ;Offset into queue to put bytes in
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QOutCount dw 0 ;Number of bytes currently in queue
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QOutGet dw 0 ;Offset into queue to get bytes from
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QOutPut dw 0 ;Offset into queue to put bytes in
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EFlags db 0 ;Extended flags
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MSRShadow db 0 ;Modem Status Register Shadow
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ErrorMask db 0 ;Default error-checking mask
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RxMask db 0 ;Character mask
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ImmedChar db 0 ;Char to be transmitted immediately
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HSFlag db 0 ;Handshake flag
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HHSLines db 0 ;8250 DTR/RTS bits for handshaking
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OutHHSLines db 0 ;Lines that must be high to output
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MSRMask db 0 ;Mask of Modem Lines to check
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MSRInfinite db 0 ;Mask of MSR lines that must be high
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IntVecNum db 0 ;Interrupt vector number
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LSRShadow db 0 ;Line Status Register shadow
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QOutMod dw 0 ;characters sent mod xOnLim ENQ/ETX [rkh]
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VCD_data dd 0
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VCDflags db 0
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MiscFlags db 0 ;still more flags
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ComDEB ends
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.errnz (SIZE ComDEB) and 1
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.errnz MSRShadow - EvtWord - 35
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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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; The LptDEB is identical to the ComDEB structure, except
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; all the COM port specific stuff has been removed (which
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; convientiently was stored at the end so offsets would
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; be correct). This allows the code to act indifferently
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; when accessing the strucutres for things like the port.
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LptDEB struc
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xComDCB db ((DCBSize+1) AND 0FFFEh) dup (0)
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xComErr dw 0 ;Non-zero if I/O error
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xPort dw 0 ;Base I/O Address
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xNotifyHandle dw 0
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xNotifyFlags dw 0
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xRecvTrigger dw -1 ; char count threshold for calling
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xSendTrigger dw 0 ; char count threshold for calling
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BIOSPortLoc dw 0 ;Offset to port location (i.e. 40:0)
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LptDEB ends
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.errnz xComDCB-ComDCB
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.errnz xComErr-ComErr
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.errnz xPort-Port
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.errnz xNotifyHandle-NotifyHandle
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.errnz xNotifyFlags-NotifyFlags
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.errnz xRecvTrigger-RecvTrigger
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.errnz xSendTrigger-SendTrigger
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; flag equates in EFlags
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fUseDSR equ 00000001b ; set, if DSR is significant
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fNoFIFO equ 00000010b ; set, if no FIFO on port
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fFIFOchkd equ 00000100b ; set, if FIFO has been checked
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fFIFOpre equ 00001000b ; FIFO enabled when port opened
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;fEOF equ 00100000b ; defined in comdev.inc
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;fTxImmed equ 01000000b ; defined in comdev.inc
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fEFlagsMask equ fUseDSR OR fFIFOpre OR fFIFOchkd OR fNoFIFO ; flags which shouldn't be cleared
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.errnz fEFlagsMask AND (fEOF OR fTxImmed) ;can't overlap with either of the bits
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; that are folded into COMS_BitMask1
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; Values for NotifyFlags
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;
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CN_RecvSent equ CN_RECEIVE SHL 8
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CN_TransSent equ CN_TRANSMIT SHL 8
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CN_Idle equ 10000000b
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CN_Notify equ 01000000b
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NotifyFlagsLO equ byte ptr NotifyFlags
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NotifyFlagsHI equ byte ptr NotifyFlags+1
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; Values for the handshake flag
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;
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; BreakSet - True if break was set - stops transmission
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; XOffSent - True if we have sent the XOff character
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; XOffPending - True if XOff character needs to be sent
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; XOnPending - True if XOn character needs to be sent
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; HHSDown - True if host dropped required hardware lines
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; HHSDropped - True if we dropped our hardware handshake lines
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; XOffReceived - True if XOff received from host
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; HSPending - Mask to return non-zero if XOn or Xoff must be sent
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; HSReceived - Mask to return non-zero if handshake has been
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; received from host stopping transmission
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; CannotXmit - Mask to return non-zero if any condition
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; exists which prevents us from tranmitting.
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; HSSent - Mask to return non-zero if we sent a handshake
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XOffPending equ 00000001b ;XOff needs to be sent
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EnqPending equ 00000001b ;Enq needs to be sent [rkh]
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EtxPending equ 00000001b ;Etx needs to be sent
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HHSDropped equ 00000010b ;Our hardware handshake lines are down
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XOnPending equ 00000100b ;XOn needs to be sent
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AckPending equ 00000100b ;Ack needs to be sent (ENQ/ACK & ETX/ACK)
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XOffReceived equ 00001000b ;XOff character received
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EnqSent equ 00001000b ;Enq has been sent
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EtxSent equ 00001000b ;Etx has been sent
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XOffSent equ 00010000b ;XOff has been sent
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EnqReceived equ 00010000b ;Enq character received (ENQ/ACK)
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EtxReceived equ 00010000b ;Etx character received (ETX/ACK)
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HHSDown equ 00100000b ;Host hardware handshake lines are down
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BreakSet equ 01000000b ;Break has been set
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HHSAlwaysDown equ 10000000b ;set if host handshake lines were never
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; detected high
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HSPending equ XOffPending+XOnPending
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HSReceived equ XOffReceived+HHSDown
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HSSent equ XOffSent+HHSDropped
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CannotXmit equ HSPending+HSReceived+BreakSet
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; values for MiscFlags
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Discard equ 00000001b ;Discard recevied data
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iodelay macro ;;macro to insure that an instruction
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jmp $+2 ;; fetch occurs between IN and/or OUT
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jmp $+2 ;; instructions on the PC-AT machine
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endm
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TimeoutError equ -2 ;Timeout error code for $TRMCOM
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Timeout equ 30 ;30 second timeout
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DELAY_TIME equ 200 ;Delay at least 200 milliseconds
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; Status bits returned from the BIOS for LPT ports
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PS_NotBusy equ 10000000b ;Printer not busy
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PS_Ack equ 01000000b ;Data acknowledged
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PS_PaperOut equ 00100000b ;Out of paper
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PS_Select equ 00010000b ;Device is selected
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PS_IOError equ 00001000b ;IO error
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PS_Timeout equ 00000001b ;Timeout occured
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; status bit defines for LPT
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L_BITS equ 0F8h ; the status bits we want
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L_BITS_INVERT equ 048h ; must invert to match BIOS
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L_DEVBUSY equ 080h ; device busy bit
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L_TIMEOUT equ 001h ; timeout bit
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; control bit defines for LPT
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L_NORMAL equ 00Ch ; normal state: selected, no reset
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L_RESET equ 008h ; reset state
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L_STROBE equ 00Dh ; tell printer we have char
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IRQ_Hook_Struc struc
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IRQn db 0
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HookCnt db 0
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OldMask db 0
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VecN db 0FFh
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HandlerOff dw 0
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First_DEB dw 0
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OldIntVec dd 0
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IFDEF No_DOSX_Bimodal_Services
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RM_OldIntVec dd 0
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RM_HandlerOff dw 0
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ENDIF
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IRQ_Hook_Struc ends
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IFDEF No_DOSX_Bimodal_Services
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include int31.inc
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Get_RM_IntVector equ (Int31_Int_Serv SHL 8) + Int_Get_Real_Vec
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Set_RM_IntVector equ (Int31_Int_Serv SHL 8) + Int_Set_Real_Vec
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ENDIF
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;
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; flag bits for VCDflags
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;
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fCOM_ignore_ints equ 00000001b
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