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Add patch 1151453 from h-a-l-9000. Improves softmodem and directserial supports. Adds a dummy serial class as well and makes the serial ports runtime changable

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2257
This commit is contained in:
Peter Veenstra 2005-07-30 14:41:31 +00:00
parent 4b6fd3c481
commit a5252330f7
19 changed files with 3329 additions and 1484 deletions
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369
include/serialport.h
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@ -16,146 +16,283 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: serialport.h,v 1.9 2005-07-30 14:41:30 qbix79 Exp $ */
#ifndef DOSBOX_SERIALPORT_H
#define DOSBOX_SERIALPORT_H
#include <assert.h>
// Uncomment this for a lot of debug messages:
//#define SERIALPORT_DEBUGMSG
#ifndef DOSBOX_DOSBOX_H
#include "dosbox.h"
#include "dosbox.h"
#endif
#ifndef DOSBOX_INOUT_H
#include "inout.h"
#include "inout.h"
#endif
#ifndef DOSBOX_TIMER_H
#include "timer.h"
#endif
//If it's too high you overflow terminal clients buffers i think
#define QUEUE_SIZE 1024
// Serial port interface //
#define MS_CTS 0x01
#define MS_DSR 0x02
#define MS_RI 0x04
#define MS_DCD 0x08
#define MC_DTR 0x1
#define MC_RTS 0x2
class CFifo {
public:
CFifo(Bitu _size) {
size=_size;
pos=used=0;
data=new Bit8u[size];
}
~CFifo() {
delete[] data;
}
INLINE Bitu left(void) {
return size-used;
}
INLINE Bitu inuse(void) {
return used;
}
void clear(void) {
used=pos=0;
}
bool isFull() {
return (used >= size);
}
void addb(Bit8u _val) {
assert(used<size);
Bitu where=pos+used;
if (where>=size) where-=size;
data[where]=_val;
used++;
}
void adds(Bit8u * _str,Bitu _len) {
assert((used+_len)<=size);
Bitu where=pos+used;
used+=_len;
while (_len--) {
if (where>=size) where-=size;
data[where++]=*_str++;
}
}
Bit8u getb(void) {
if (!used) return data[pos];
Bitu where=pos;
if (++pos>=size) pos-=size;
used--;
return data[where];
}
void gets(Bit8u * _str,Bitu _len) {
assert(used>=_len);
used-=_len;
while (_len--) {
*_str++=data[pos];
if (++pos>=size) pos-=size;
}
}
private:
Bit8u * data;
Bitu size,pos,used;
};
class CSerial {
public:
CSerial() {
}
// Constructor takes base port (0x3f0, 0x2f0, 0x2e0, etc.), IRQ, and initial bps //
CSerial (Bit16u initbase, Bit8u initirq, Bit32u initbps);
// Constructor takes base port (0x3f8, 0x2f8, 0x2e8, etc.), IRQ, and initial bps //
CSerial(IO_ReadHandler* rh, IO_WriteHandler* wh,
TIMER_TickHandler TimerHandler,
Bit16u initbase, Bit8u initirq, Bit32u initbps,
Bit8u bytesize, const char* parity, Bit8u stopbits);
TIMER_TickHandler TimerHnd;
virtual ~CSerial();
IO_ReadHandleObject ReadHandler[8];
IO_WriteHandleObject WriteHandler[8];
void write_reg(Bitu reg, Bitu val);
Bitu read_reg(Bitu reg);
void SetModemStatus(Bit8u status);
virtual bool CanRecv(void)=0;
virtual bool CanSend(void)=0;
virtual void Send(Bit8u val)=0;
virtual Bit8u Recv(Bit8u val)=0;
virtual void Timer(void);
void checkint(void);
void Timer(void);
virtual void Timer2(void)=0;
Bitu base;
Bitu irq;
Bitu bps;
Bit8u mctrl;
bool CSerial::getDTR();
bool CSerial::getRTS();
CFifo *rqueue;
CFifo *tqueue;
bool CSerial::getRI();
bool CSerial::getCD();
bool CSerial::getDSR();
bool CSerial::getCTS();
void CSerial::setRI(bool value);
void CSerial::setDSR(bool value);
void CSerial::setCD(bool value);
void CSerial::setCTS(bool value);
void CSerial::Write_THR(Bit8u data);
Bitu CSerial::Read_RHR();
Bitu CSerial::Read_IER();
void CSerial::Write_IER(Bit8u data);
Bitu CSerial::Read_ISR();
Bitu CSerial::Read_LCR();
void CSerial::Write_LCR(Bit8u data);
Bitu CSerial::Read_MCR();
void CSerial::Write_MCR(Bit8u data);
Bitu CSerial::Read_LSR();
// Really old hardware seems to have the delta part of this register writable
void CSerial::Write_MSR(Bit8u data);
Bitu CSerial::Read_MSR();
Bitu CSerial::Read_SPR();
void CSerial::Write_SPR(Bit8u data);
void CSerial::Write_reserved(Bit8u data, Bit8u address);
// If a byte comes from wherever(loopback or real port or maybe
// that softmodem thingy), put it in here.
void CSerial::receiveByte(Bit8u data);
// If an error was received, put it here (in LSR register format)
void CSerial::receiveError(Bit8u errorword);
// connected device checks, if port can receive data:
bool CSerial::CanReceiveByte();
// When done sending, notify here
void CSerial::ByteTransmitted();
// Virtual app has read the received data
virtual void RXBufferEmpty()=0;
// real transmit
virtual void transmitByte(Bit8u val)=0;
// switch break state to the passed value
virtual void setBreak(bool value)=0;
// set output lines
virtual void updateModemControlLines(/*Bit8u mcr*/)=0;
// change baudrate, number of bits, parity, word length al at once
virtual void updatePortConfig(Bit8u dll, Bit8u dlm, Bit8u lcr)=0;
// CSerial requests an update of the input lines
virtual void updateMSR()=0;
// after update request, or some "real" changes,
// modify MSR here
void CSerial::changeMSR(Bit8u data); // make public
void CSerial::Init_Registers(Bit32u initbps,
Bit8u bytesize, const char* parity, Bit8u stopbits);
private:
void UpdateBaudrate(void);
bool FIFOenabled;
Bit8u FIFOsize;
bool dotxint;
Bit8u scratch;
Bit8u dlab;
Bit8u divisor_lsb;
Bit8u divisor_msb;
Bit8u local_loopback;
Bit8u iir;
Bit8u ier;
Bit8u mstatus;
Bit8u linectrl;
Bit8u errors;
IO_ReadHandleObject ReadHandler[9];
IO_WriteHandleObject WriteHandler[9];
// I used this spec: http://www.exar.com/products/st16c450v420.pdf
void CSerial::changeMSR_Loopback(Bit8u data);
void CSerial::WriteRealIER(Bit8u data);
// reason for an interrupt has occured - functions triggers interrupt
// if it is enabled and no higher-priority irq pending
void CSerial::rise(Bit8u priority);
// clears the pending interrupt
void CSerial::clear(Bit8u priority);
#define ERROR_PRIORITY 4 // overrun, parity error, frame error, break
#define RX_PRIORITY 1 // a byte has been received
#define TX_PRIORITY 2 // tx buffer has become empty
#define MSR_PRIORITY 8 // CRS, DSR, RI, DCD change
#define NONE_PRIORITY 0
Bit8u pending_interrupts; // stores triggered interupts
Bit8u current_priority;
Bit8u waiting_interrupts; // these are on, but maybe not enabled
// 16C450 (no FIFO)
// read/write name
Bit8u DLL; // r Baudrate divider low byte
Bit8u DLM; // r "" high byte
Bit8u RHR; // r Receive Holding Register, also LSB of Divisor Latch (r/w)
#define RHR_OFFSET 0
// Data: whole byte
Bit8u THR; // w Transmit Holding Register
#define THR_OFFSET 0
// Data: whole byte
Bit8u IER; // r/w Interrupt Enable Register, also MSB of Divisor Latch (r/w)
#define IER_OFFSET 1
// Data:
// bit0 receive holding register
// bit1 transmit holding register
// bit2 receive line status interrupt
// bit3 modem status interrupt
#define RHR_INT_Enable_MASK 0x1
#define THR_INT_Enable_MASK 0x2
#define Receive_Line_INT_Enable_MASK 0x4
#define Modem_Status_INT_Enable_MASK 0x8
Bit8u ISR; // r Interrupt Status Register
#define ISR_OFFSET 2
#define ISR_CLEAR_VAL 0x1
#define ISR_ERROR_VAL 0x6
#define ISR_RX_VAL 0x4
#define ISR_TX_VAL 0x2
#define ISR_MSR_VAL 0x0
public:
Bit8u LCR; // r/w Line Control Register
private:
#define LCR_OFFSET 3
// bit0: word length bit0
// bit1: word length bit1
// bit2: stop bits
// bit3: parity enable
// bit4: even parity
// bit5: set parity
// bit6: set break
// bit7: divisor latch enable
#define LCR_BREAK_MASK 0x40
#define LCR_DIVISOR_Enable_MASK 0x80
#define LCR_PORTCONFIG_MASK 0x3F
#define LCR_PARITY_NONE 0x0
#define LCR_PARITY_ODD 0x8
#define LCR_PARITY_EVEN 0x18
#define LCR_PARITY_MARK 0x28
#define LCR_PARITY_SPACE 0x38
#define LCR_DATABITS_5 0x0
#define LCR_DATABITS_6 0x1
#define LCR_DATABITS_7 0x2
#define LCR_DATABITS_8 0x3
#define LCR_STOPBITS_1 0x0
#define LCR_STOPBITS_MORE_THAN_1 0x4
Bit8u MCR; // r/w Modem Control Register
#define MCR_OFFSET 4
// bit0: DTR
// bit1: RTS
// bit2: OP1
// bit3: OP2
// bit4: loop back enable
#define MCR_LOOPBACK_Enable_MASK 0x10
#define MCR_LEVELS_MASK 0xf
#define MCR_DTR_MASK 0x1
#define MCR_RTS_MASK 0x2
#define MCR_OP1_MASK 0x4
#define MCR_OP2_MASK 0x8
Bit8u LSR; // r Line Status Register
#define LSR_OFFSET 5
#define LSR_RX_DATA_READY_MASK 0x1
#define LSR_OVERRUN_ERROR_MASK 0x2
#define LSR_PARITY_ERROR_MASK 0x4
#define LSR_FRAMING_ERROR_MASK 0x8
#define LSR_RX_BREAK_MASK 0x10
#define LSR_TX_HOLDING_EMPTY_MASK 0x20
#define LSR_TX_EMPTY_MASK 0x40
#define LSR_ERROR_MASK 0x1e
Bit8u MSR; // r Modem Status Register
#define MSR_OFFSET 6
// bit0: deltaCTS
// bit1: deltaDSR
// bit2: deltaRI
// bit3: deltaCD
// bit4: CTS
// bit5: DSR
// bit6: RI
// bit7: CD
#define MSR_delta_MASK 0xf
#define MSR_LINE_MASK 0xf0
#define MSR_dCTS_MASK 0x1
#define MSR_dDSR_MASK 0x2
#define MSR_dRI_MASK 0x4
#define MSR_dCD_MASK 0x8
#define MSR_CTS_MASK 0x10
#define MSR_DSR_MASK 0x20
#define MSR_RI_MASK 0x40
#define MSR_CD_MASK 0x80
Bit8u SPR; // r/w Scratchpad Register
#define SPR_OFFSET 7
// For loopback purposes...
bool loopback_pending;
Bit8u loopback_data;
void transmitLoopbackByte(Bit8u val);
// 16C550 (FIFO)
// TODO
//Bit8u FCR; // FIFO Control Register
};
#include <list>
typedef std::list<CSerial *> CSerialList;
typedef std::list<CSerial *>::iterator CSerial_it;
extern CSerialList seriallist;
#define COM1_BASE 0x3f8
#define COM2_BASE 0x2f8
#define COM3_BASE 0x3e8
#define COM4_BASE 0x2e8
#endif