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CTASK.ZIP
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TSKSIO.C
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C/C++ Source or Header
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1989-12-20
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26KB
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956 lines
/*
--- Version 2.0 89-12-13 17:40 ---
TSKSIO.C - CTask - Serial I/O interface routines.
Public Domain Software written by
Thomas Wagner
Patschkauer Weg 31
D-1000 Berlin 33
West Germany
With version 1.1, support for shared IRQ lines and dynamically
defined ports was added. The tables used are
port_list The pointer to the list of defined ports. Newly
defined ports are added to the end of the list.
Ports can never be deleted. Each port descriptor
contains the hardware info for the port, plus a
pointer to the associated sio-control-block if the
port was initialized.
port_last The pointer to the last element in port_list.
irq_array Is an array of pointers to sio-control-blocks. For
each possible IRQ-line the entry in this table points
to the first block active for this line. If the IRQ
is shared, sio-blocks are chained into this list via
their "next" pointer.
irq_procs Contains the pointer to the interrupt handler function
for the corresponding IRQ-line.
sio_data Contains the statically defined sio control blocks.
port_descr Contains the statically defined port descriptor blocks.
NOTE: You can not dynamically define ports for IRQ-lines that
have no interrupt handler function defined. To be completely
flexible, you would have to define sioint-handlers for all
possible IRQs and enter the addresses into the irq_procs array.
CAUTION: Please restrict the installation and removal of v24-
ports to *one* task. The manipulation of the lists is
not protected, so simultaneous install/remove calls
may cause trouble. Since ports are normally installed and
removed in the main task, the protection of critical regions
seemed unnecessary.
CAUTION: Shared interrupt logic and IRQ-lines above 4 were not
tested due to the lack of suitable hardware. Changes may
be necessary in the handling of the modem control register
OUT2 line that normally controls interrupt enable, depending
on the multiport-hardware installed in the target system.
With Version 1.2, special interrupt handler functions have been added
in a separate assembler file, TSKSIOI.ASM. These functions switch to
a local stack, and then call the sioint-functions defined here, which
no longer have the interrupt attribute.
*/
#include "tsk.h"
#include "sio.h"
#define MAX_IRQ 16 /* Maximum number of interrupt lines,
16 for AT, 8 for XT. Can be left at 16 */
#define CHAIN_IRQBIT 0x04 /* Chained int controller IRQ bit */
#define RESTORE_DEFAULT 1 /* Restore parameter for remove_all */
typedef void (interrupt far * intprocptr)(void);
#define RTS 0x02
#define DTR 0x01
#define OUT2 0x08
#define ERR_MASK 0x1e
#define inta00 0x20 /* 8259 interrupt controller control-port */
#define inta01 0x21 /* 8259 interrupt controller mask-port */
#define inta10 0xa0 /* secondary 8259 control-port for IRQ 8-15 */
#define inta11 0xa1 /* secondary 8259 mask-port for IRQ 8-15 */
#define rdserv 0x0b /* read service register control value */
#define eoi 0x20 /* end of interrupt signal for 8259 */
#define intdata 0x0b /* Enable Interrupts except Line status */
#define rxreadybit 0x01
#define txemptybit 0x40
#define txreadybit 0x20
#define framingbit 0x08
#define breakbit 0x10
/* Note: In version 1.1, port offsets start at 0, not 8 */
#define linecontrol 0x03
#define linestatus 0x05
#define intid 0x02
#define intenable 0x01
#define modemcontrol 0x04
#define modemstatus 0x06
#define receivedata 0x00
#define transmitdata 0x00
#define baudreg_dll 0x00 /* baud rate least significant byte */
#define baudreg_dlm 0x01 /* baud rate most significant byte */
/*
Default values for initialising the ports.
Change to your liking (but remember that OUT2 must be set in the
modem control register to allow interrupts to come through with
normal controllers).
*/
#define dflt_modcon 0x0b /* Modem Control: Activate DTR, RTS, OUT2 */
#define dflt_baud 96 /* Baud Rate Divisor: 1200 Baud */
#define dflt_lcon 0x03 /* Line Control: No Parity, 1 Stop, 8 Data */
/*
Defined baud rates. You may expand this table with non-standard
rates if desired.
*/
local long baud_table [] = {
50L, 2304L,
75L, 1536L,
110L, 1047L,
134L, 857L,
150L, 768L,
300L, 384L,
600L, 192L,
1200L, 96L,
1800L, 64L,
2000L, 58L,
2400L, 48L,
3600L, 32L,
4800L, 24L,
7200L, 16L,
9600L, 12L,
19200L, 6L,
38400L, 3L,
0L, 0L };
local byte force_transmit_ready; /* flag to indicate
transmitter needs service */
/*-------------------------------------------------------------------------*/
/*
To add static support for other COM-Ports, define
- Port base
- IRQ-Line
- Interrupt vector
here, and add the necessary data to the port_descr array.
If the port does *not* share an IRQ with the predefined ports,
define the corresponding interrupt function by duplicating both siointx
here and _tsksio_intx in the TSKSIOI.ASM file, and place the
entry for the _tsksio_intx function into the irq_procs array.
Note that ports may also be defined on-line if TSK_DYNAMIC is enabled.
*/
#define STATIC_PORTS 2 /* Number of statically defined ports */
/* Note: In version 1.1, port offsets start at 0, not 8 */
#define com1_base 0x3f8 /* COM1 port base */
#define com2_base 0x2f8 /* COM2 port base */
#define com1_irq 4 /* IRQ-Line for COM1 */
#define com2_irq 3 /* IRQ-Line for COM2 */
#define com1_vect 0x0c /* Interrupt vector for COM1 */
#define com2_vect 0x0b /* Interrupt vector for COM2 */
/*-------------------------------------------------------------------------*/
extern void interrupt far tsksio_int2 (void);
extern void interrupt far tsksio_int3 (void);
extern void interrupt far tsksio_int4 (void);
extern void interrupt far tsksio_int5 (void);
extern void interrupt far tsksio_int7 (void);
extern void interrupt far tsksio_int10 (void);
extern void interrupt far tsksio_int11 (void);
extern void interrupt far tsksio_int12 (void);
extern void interrupt far tsksio_int15 (void);
/*
Table of Interrupt handler functions for each IRQ line.
*/
local intprocptr irq_procs [MAX_IRQ] = { NULL, /* IRQ 0 */
NULL, /* IRQ 1 */
tsksio_int2, /* IRQ 2 */
tsksio_int3, /* IRQ 3 */
tsksio_int4, /* IRQ 4 */
tsksio_int5, /* IRQ 5 */
NULL, /* IRQ 6 */
tsksio_int7, /* IRQ 7 */
NULL, /* IRQ 8 */
NULL, /* IRQ 9 */
tsksio_int10, /* IRQ 10 */
tsksio_int11, /* IRQ 11 */
tsksio_int12, /* IRQ 12 */
NULL, /* IRQ 13 */
NULL, /* IRQ 14 */
tsksio_int15 /* IRQ 15 */
};
local sio_datarec sio_data [STATIC_PORTS];
/* When adding entries to port_descr, be sure to chain the
elements in ascending order via the first field, and to
increase the internal port number in the second field. */
local port_data port_descr [STATIC_PORTS] = {
{ &port_descr[1], 0, NULL, com1_base, com1_irq, com1_vect },
{ NULL, 1, NULL, com2_base, com2_irq, com2_vect }
};
local sioptr irq_array [MAX_IRQ] = { NULL };
local portptr port_list = &port_descr [0];
local portptr port_last = &port_descr [1];
local int ports = STATIC_PORTS;
extern funcptr v24_remove_func;
/*-------------------------------------------------------------------------*/
local void near change_rts (sioptr data, int on)
{
data->rtsoff = (byte)(!on);
data->cmodcontrol = (data->cmodcontrol & ~RTS) | ((on) ? RTS : 0);
tsk_outp (data->port_base + modemcontrol, data->cmodcontrol);
}
local void near transmit_ready (sioptr data)
{
int i;
#if (MSC)
int temp;
#endif
force_transmit_ready = 0;
if ((i = data->r_xoff) < 0)
{
#if (MSC)
temp = (i == -1) ? XOFF : XON;
tsk_outp (data->port_base + transmitdata, temp);
#else
/* NOTE: Microsoft C 5.0 generates an "Internal Compiler Error"
when compiling the following statement.
*/
tsk_outp (data->port_base + transmitdata, (i == -1) ? XOFF : XON);
#endif
data->r_xoff = (i == -1) ? 1 : 0;
data->xmit_pending = 1;
return;
}
data->xmit_pending = 0;
if ((data->wait_xmit = (byte)(check_pipe (&data->xmit_pipe) != -1)) == 0)
return;
if ((data->modem_flags & data->modstat) ^ data->modem_flags)
return;
if (data->flags & XONXOFF && data->t_xoff)
return;
data->wait_xmit = 0;
if ((i = c_read_pipe (&data->xmit_pipe)) < 0)
return;
tsk_outp (data->port_base + transmitdata, (byte)i);
data->xmit_pending = 1;
}
local void near modem_status_int (sioptr data)
{
data->modstat = tsk_inp (data->port_base + modemstatus);
if (data->wait_xmit)
transmit_ready (data);
}
local void near receive_ready (sioptr data)
{
word status;
word ch;
while ((status = tsk_inp (data->port_base + linestatus)) & rxreadybit)
{
/* Correct for possible loss of transmit interrupt from IIR register */
if (status & txreadybit)
force_transmit_ready = 1;
tsk_nop ();
ch = tsk_inp (data->port_base + receivedata);
if (data->flags & XONXOFF)
{
if (ch == XON)
{
data->t_xoff = 0;
if (data->wait_xmit)
transmit_ready (data);
continue;
}
else if (ch == XOFF)
{
data->t_xoff = 1;
continue;
}
if (!data->r_xoff &&
wpipe_free (&data->rcv_pipe) < data->xoff_threshold)
{
data->r_xoff = -1;
if (!data->xmit_pending)
transmit_ready (data);
}
}
if (data->flags & RTSCTS && !data->rtsoff)
if (wpipe_free (&data->rcv_pipe) < data->xoff_threshold)
change_rts (data, 0);
status = (status & ERR_MASK) << 8;
if (c_write_wpipe (&data->rcv_pipe, ch | status) < 0)
data->overrun = 1;
}
}
/*-------------------------------------------------------------------------*/
local void near sioint (sioptr data)
{
int id;
force_transmit_ready = 0;
while (!((id = tsk_inp (data->port_base + intid)) & 1))
switch (id & 0x07)
{
case 0x00: modem_status_int (data);
break;
case 0x02: transmit_ready (data);
break;
case 0x04: receive_ready (data);
break;
/* case 0x06: line_status_int (data); (currently not used)
break;
*/
}
if (force_transmit_ready)
transmit_ready (data);
}
void near tsk_sio_int (int irq)
{
sioptr curr;
for (curr = irq_array [irq]; curr != NULL; curr = curr->next)
sioint (curr);
}
/*-------------------------------------------------------------------------*/
int far v24_define_port (int base, byte irq, byte vector)
{
#if (TSK_DYNAMIC)
portptr portp;
if (irq >= MAX_IRQ)
return -1;
if (irq_procs [irq] == NULL)
return -1;
if ((portp = tsk_alloc (sizeof (port_data))) == NULL)
return -1;
portp->pnum = ports;
portp->base = base;
portp->irq = irq;
portp->vector = vector;
portp->next = NULL;
portp->sio = NULL;
if (port_list == NULL)
port_list = portp;
else
port_last->next = portp;
port_last = portp;
ports++;
return portp->pnum;
#else
return -1;
#endif
}
local sioptr ret_error (sioptr sio)
{
sio->port->sio = NULL;
#if (TSK_DYNAMIC)
if (sio->port->pnum >= STATIC_PORTS)
tsk_free (sio);
#endif
return NULL;
}
sioptr far v24_install (int port, int init,
farptr rcvbuf, word rcvsize,
farptr xmitbuf, word xmitsize)
{
sioptr sio;
portptr portp;
int pbase;
intprocptr far *intptr;
int i, inta;
#if (TSK_NAMEPAR)
static char xname [] = "SIOnXMIT", rname [] = "SIOnRCV";
xname [3] = rname [3] = (char)(port & 0x7f) + '0';
#endif
if (port < 0 || !rcvsize || !xmitsize)
return NULL;
portp = port_list;
if (port & 0x80) /* Relative port number */
{
port &= 0x7f;
if (port > 4)
return NULL;
pbase = *((wordptr)(MK_FP (0x40, port * 2)));
if (!pbase)
return NULL;
for (port = 0; port < ports; port++, portp = portp->next)
if (portp->base == pbase)
break;
if (port >= ports)
return NULL;
}
else
{
if (port > ports)
return NULL;
for (i = 0; i < port; i++)
portp = portp->next;
}
if (portp->sio != NULL) /* Port already in use ? */
return NULL;
if (port < STATIC_PORTS)
portp->sio = sio = &sio_data [port];
else
#if (TSK_DYNAMIC)
if ((portp->sio = sio = tsk_alloc (sizeof (sio_datarec))) == NULL)
return NULL;
#else
return NULL;
#endif
pbase = sio->port_base = portp->base;
sio->port = portp;
/* Check if port accessible by modifying the modem control register */
i = sio->cmodcontrol = sio->save_mcon = tsk_inp (pbase + modemcontrol);
if (i & 0xe0)
return ret_error (sio);
tsk_nop ();
tsk_outp (pbase + modemcontrol, 0xe0 | i);
tsk_nop ();
if (tsk_inp (pbase + modemcontrol) != (byte) i)
return ret_error (sio);
/* Port seems OK */
if (create_pipe (&sio->xmit_pipe, xmitbuf, xmitsize
#if (TSK_NAMEPAR)
, xname
#endif
) == NULL)
return ret_error (sio);
if (create_wpipe (&sio->rcv_pipe, rcvbuf, rcvsize
#if (TSK_NAMEPAR)
, rname
#endif
) == NULL)
{
delete_pipe (&sio->xmit_pipe);
return ret_error (sio);
}
sio->civect = portp->vector;
sio->irqbit = (byte)(1 << (portp->irq & 0x07));
sio->wait_xmit = sio->xmit_pending = 0;
sio->overrun = 0;
sio->flags = 0;
sio->modem_flags = 0;
sio->r_xoff = sio->t_xoff = 0;
sio->rtsoff = 0;
sio->clcontrol = sio->save_lcon = tsk_inp (pbase + linecontrol);
tsk_nop ();
sio->save_inten = tsk_inp (pbase + intenable);
tsk_nop ();
if (init)
{
sio->clcontrol = dflt_lcon;
sio->cmodcontrol = dflt_modcon;
}
tsk_outp (pbase + linecontrol, sio->clcontrol | 0x80);
tsk_nop ();
sio->save_bd1 = tsk_inp (pbase + baudreg_dll);
tsk_nop ();
sio->save_bd2 = tsk_inp (pbase + baudreg_dlm);
tsk_nop ();
tsk_outp (pbase + linecontrol, sio->clcontrol);
tsk_nop ();
tsk_outp (pbase + intenable, 0);
if (irq_array [portp->irq] == NULL)
{
intptr = (intprocptr far *)MK_FP (0, sio->civect * 4);
tsk_cli ();
sio->savvect = *intptr;
*intptr = irq_procs [portp->irq];
tsk_sti ();
}
if (init)
{
tsk_outp (pbase + linecontrol, dflt_lcon | 0x80);
tsk_nop ();
tsk_outp (pbase + baudreg_dll, dflt_baud);
tsk_nop ();
tsk_outp (pbase + baudreg_dlm, dflt_baud >> 8);
tsk_nop ();
tsk_outp (pbase + linecontrol, dflt_lcon);
tsk_nop ();
tsk_outp (pbase + modemcontrol, dflt_modcon);
tsk_nop ();
}
else
{
i = tsk_inp (pbase + modemcontrol) | OUT2;
tsk_nop ();
tsk_outp (pbase + modemcontrol, i);
tsk_nop ();
}
while (tsk_inp (pbase + linestatus) & rxreadybit)
{
tsk_nop ();
tsk_inp (pbase + receivedata);
tsk_nop ();
}
tsk_nop ();
tsk_inp (pbase + linestatus);
tsk_nop ();
sio->modstat = tsk_inp (pbase + modemstatus);
tsk_nop ();
tsk_inp (pbase + intid);
tsk_nop ();
inta = (portp->irq > 7) ? inta11 : inta01;
if (irq_array [portp->irq] == NULL)
{
if (portp->irq > 7)
{
i = tsk_inp (inta01) & ~CHAIN_IRQBIT;
tsk_nop ();
tsk_outp (inta01, i);
}
sio->save_irq = (byte)((i = tsk_inp (inta)) & sio->irqbit);
tsk_nop ();
tsk_outp (inta, i & ~sio->irqbit);
}
else
sio->save_irq = (irq_array [portp->irq])->save_irq;
tsk_cli ();
sio->next = irq_array [portp->irq];
irq_array [portp->irq] = sio;
tsk_sti ();
v24_remove_func = v24_remove_all;
/* Enable interrupts with correction for possible loss of the
first tranmit interrupt on INS8250 and INS8250-B chips */
for (;;)
{
if (tsk_inp (pbase + linestatus) & txreadybit)
{
break;
}
tsk_nop ();
}
tsk_nop ();
tsk_cli ();
tsk_outp (pbase + intenable, intdata);
tsk_nop ();
tsk_outp (pbase + intenable, intdata);
tsk_sti ();
return sio;
}
void far v24_remove (sioptr sio, int restore)
{
intprocptr far *intptr;
int pbase, i, inta;
portptr portp;
sioptr curr, last;
pbase = sio->port_base;
portp = sio->port;
last = NULL;
curr = irq_array [portp->irq];
while (curr != sio && curr != NULL)
{
last = curr;
curr = curr->next;
}
if (curr == NULL)
return;
tsk_outp (pbase + intenable, 0);
tsk_cli ();
if (last == NULL)
irq_array [portp->irq] = sio->next;
else
last->next = sio->next;
tsk_sti ();
inta = (portp->irq > 7) ? inta11 : inta01;
if (restore)
{
tsk_outp (pbase + modemcontrol, sio->save_mcon);
tsk_nop ();
tsk_outp (pbase + linecontrol, sio->save_lcon | 0x80);
tsk_nop ();
tsk_outp (pbase + baudreg_dll, sio->save_bd1);
tsk_nop ();
tsk_outp (pbase + baudreg_dlm, sio->save_bd2);
tsk_nop ();
tsk_outp (pbase + linecontrol, sio->save_lcon);
tsk_nop ();
if (irq_array [portp->irq] == NULL)
{
tsk_cli ();
tsk_outp (pbase + intenable, sio->save_inten);
i = tsk_inp (inta) & ~sio->irqbit;
tsk_nop ();
tsk_outp (inta, i | sio->save_irq);
}
}
else if (irq_array [portp->irq] == NULL)
{
tsk_cli ();
i = tsk_inp (inta) | sio->irqbit;
tsk_nop ();
tsk_outp (inta, i);
}
if (irq_array [portp->irq] == NULL)
{
tsk_cli ();
intptr = (intprocptr far *)MK_FP (0, sio->civect * 4);
*intptr = sio->savvect;
}
tsk_sti ();
portp->sio = NULL;
delete_pipe (&sio->xmit_pipe);
delete_wpipe (&sio->rcv_pipe);
#if (TSK_DYNAMIC)
if (portp->pnum >= STATIC_PORTS)
tsk_free (sio);
#endif
}
void far v24_remove_all (void)
{
int i;
sioptr sio;
for (i = 0; i < MAX_IRQ; i++)
{
while ((sio = irq_array [i]) != NULL)
v24_remove (sio, RESTORE_DEFAULT);
}
}
/*-------------------------------------------------------------------------*/
/*
void v24_change_rts (sioptr sio, int on)
*/
void far v24_change_rts (sioptr sio, int on)
{
sio->cmodcontrol = (sio->cmodcontrol & ~RTS) | ((on) ? RTS : 0);
tsk_outp (sio->port_base + modemcontrol, sio->cmodcontrol);
}
/*
void v24_change_dtr (sioptr sio, int on)
*/
void far v24_change_dtr (sioptr sio, int on)
{
sio->cmodcontrol = (sio->cmodcontrol & ~DTR) | ((on) ? DTR : 0);
tsk_outp (sio->port_base + modemcontrol, sio->cmodcontrol);
}
/*
void far v24_change_baud (sioptr sio, int rate)
*/
void far v24_change_baud (sioptr sio, long rate)
{
int i;
for (i = 0; baud_table [i]; i += 2)
if (baud_table [i] == rate)
break;
if ((i = (int)baud_table [i + 1]) == 0)
return;
tsk_outp (sio->port_base + linecontrol, sio->clcontrol | (byte)0x80);
tsk_nop ();
tsk_outp (sio->port_base + baudreg_dll, (byte)i);
tsk_nop ();
tsk_outp (sio->port_base + baudreg_dlm, (byte)(i >> 8));
tsk_nop ();
tsk_outp (sio->port_base + linecontrol, sio->clcontrol);
}
void far v24_change_parity (sioptr sio, int par)
{
sio->clcontrol = (sio->clcontrol & 0xc7) | par;
tsk_outp (sio->port_base + linecontrol, sio->clcontrol);
}
void far v24_change_wordlength (sioptr sio, int len)
{
int i;
switch (len)
{
case 5: i = 0x00; break;
case 6: i = 0x01; break;
case 7: i = 0x02; break;
case 8: i = 0x03; break;
default: return;
}
sio->clcontrol = (sio->clcontrol & 0xfc) | i;
tsk_outp (sio->port_base + linecontrol, sio->clcontrol);
}
void far v24_change_stopbits (sioptr sio, int n)
{
int i;
switch (n)
{
case 1: i = 0x00; break;
case 2: i = 0x04; break;
default: return;
}
sio->clcontrol = (sio->clcontrol & 0xfb) | i;
tsk_outp (sio->port_base + linecontrol, sio->clcontrol);
}
void far v24_watch_modem (sioptr sio, byte flags)
{
sio->modem_flags = flags & (CTS | DSR | RI | CD);
}
void far v24_protocol (sioptr sio, int prot, word offthresh, word onthresh)
{
byte old;
old = sio->flags;
sio->flags = (byte)prot;
if (prot)
{
if (!offthresh)
offthresh = 10;
sio->xoff_threshold = offthresh;
if (onthresh <= offthresh)
onthresh = offthresh + 10;
sio->xon_threshold = onthresh;
}
if ((old & RTSCTS) != ((byte)prot & RTSCTS))
{
change_rts (sio, 1);
sio->modem_flags = (sio->modem_flags & ~CTS) |
((prot & RTSCTS) ? CTS : 0);
}
if (!(prot & XONXOFF))
{
if (sio->r_xoff)
sio->r_xoff = -2;
sio->t_xoff = 0;
}
if (!sio->xmit_pending)
transmit_ready (sio);
}
/*-------------------------------------------------------------------------*/
int far v24_send (sioptr sio, byte ch, dword timeout)
{
int res;
if ((res = write_pipe (&sio->xmit_pipe, ch, timeout)) < 0)
return res;
tsk_cli ();
if (!sio->xmit_pending)
transmit_ready (sio);
tsk_sti ();
return 0;
}
int far v24_receive (sioptr sio, dword timeout)
{
int res;
if ((res = (int)read_wpipe (&sio->rcv_pipe, timeout)) < 0)
return res;
if (!sio->flags)
return res;
if (wpipe_free (&sio->rcv_pipe) > sio->xon_threshold)
{
tsk_cli ();
if (sio->r_xoff)
{
sio->r_xoff = -2;
if (!sio->xmit_pending)
transmit_ready (sio);
}
tsk_sti ();
if (sio->rtsoff)
change_rts (sio, 1);
}
return res;
}
int far v24_overrun (sioptr sio)
{
int res;
res = sio->overrun;
sio->overrun = 0;
return res;
}
int far v24_check (sioptr sio)
{
return check_wpipe (&sio->rcv_pipe);
}
int far v24_modem_status (sioptr sio)
{
return sio->modstat;
}
int far v24_complete (sioptr sio)
{
return (check_pipe (&sio->xmit_pipe) == -1);
}
int far v24_wait_complete (sioptr sio, dword timeout)
{
return wait_pipe_empty (&sio->xmit_pipe, timeout);
}
void far v24_flush_receive (sioptr sio)
{
flush_wpipe (&sio->rcv_pipe);
}
void far v24_flush_transmit (sioptr sio)
{
flush_pipe (&sio->xmit_pipe);
}