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rcornwell.sims/IBM360/ibm360_scon.c
Richard Cornwell 8a6ea8889e IBM360: Fixes to better handle storage modification bits.
2024-02-15 14:13:15 -05:00

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/* ibm360_scon.c: IBM 360 Secondary consoles.
Copyright (c) 2017-2023, Richard Cornwell
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
RICHARD CORNWELL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
This is the standard inquiry or console interface.
These units each buffer one record in local memory and signal
ready when the buffer is full or empty. The channel must be
ready to recieve/transmit data when they are activated since
they will transfer their block during chan_cmd. All data is
transmitted as BCD characters.
*/
#include "ibm360_defs.h"
#include "sim_defs.h"
#include "sim_sock.h"
#include "sim_tmxr.h"
#include <ctype.h>
#ifdef NUM_DEVS_SCON
/* Held in u3 */
#define CHN_SNS 0x04 /* Sense command */
#define CON_WR 0x01 /* Write console */
#define CON_ACR 0x09 /* Auto carrage return */
#define CON_RD 0x0a /* Read console */
#define CON_ALR 0x0b /* Control Alarm */
#define CON_NOP 0x03 /* No op command */
#define CON_MSK 0x0f /* Command mask */
/* Status held in u3 */
#define CON_INPUT 0x100 /* Input ready for unit */
#define CON_CR 0x200 /* Output at beginning of line */
#define CON_REQ 0x400 /* Request key pressed */
#define CON_OUTPUT 0x800 /* Output characters since R */
#define CON_CANCEL 0x1000 /* Control C pressed */
/* Upper 11 bits of u3 hold the device address */
/* Input buffer pointer held in u4 */
/* in u5 packs sense byte 0,1 and 3 */
/* Sense byte 0 */
#define SNS_CMDREJ 0x80 /* Command reject */
#define SNS_INTVENT 0x40 /* Unit intervention required */
#define CMD u3
#define IPTR u4
#define SNS u5
/* std devices. data structures
scon_dev Console device descriptor
scon_unit Console unit descriptor
scon_reg Console register list
scon_mod Console modifiers list
*/
struct _scon_data
{
uint8 ibuff[145]; /* Input line buffer */
uint8 inptr;
}
scon_data[NUM_DEVS_SCON];
TMLN scon_ldsc[NUM_DEVS_SCON];
TMXR scon_desc = { NUM_DEVS_SCON, 0, 0, scon_ldsc};
extern int32 tmxr_poll;
uint8 scon_startcmd(UNIT *, uint8);
uint8 scon_haltio(UNIT *);
void scon_ini(UNIT *, t_bool);
t_stat scon_srv(UNIT *);
t_stat scon_srvo(UNIT *);
t_stat scon_reset(DEVICE *);
t_stat scon_attach(UNIT *, CONST char *);
t_stat scon_detach(UNIT *);
t_stat scon_help(FILE *, DEVICE *, UNIT *, int32, const char *);
const char *scon_description(DEVICE *d);
UNIT scon_unit[] = {
{UDATA(scon_srv, UNIT_ATTABLE|UNIT_DISABLE|UNIT_DIS|UNIT_IDLE, 0), 0, UNIT_ADDR(0x09)}, /* B */
{UDATA(scon_srv, UNIT_ATTABLE|UNIT_DISABLE|UNIT_DIS|UNIT_IDLE, 0), 0, UNIT_ADDR(0x2F)}, /* C */
{UDATA(scon_srvo, UNIT_DISABLE|UNIT_DIS|UNIT_IDLE, 0) },
};
MTAB scon_mod[] = {
{MTAB_XTD | MTAB_VUN | MTAB_VALR, 0, "DEV", "DEV", &set_dev_addr,
&show_dev_addr, NULL},
{0}
};
struct dib scon_dib = { 0xFF, 1, NULL, scon_startcmd, scon_haltio, scon_unit, scon_ini};
DEVICE scon_dev = {
"SCON", scon_unit, NULL, scon_mod,
NUM_DEVS_CON, 8, 15, 1, 8, 8,
NULL, NULL, &scon_reset, NULL, &scon_attach, &scon_detach,
&scon_dib, DEV_MUX | DEV_UADDR | DEV_DISABLE | DEV_DEBUG, 0, dev_debug,
NULL, NULL, &scon_help, NULL, NULL, &scon_description
};
/*
* Console printer routines.
*/
void
scon_ini(UNIT *uptr, t_bool f) {
int u = (uptr - scon_unit);
scon_data[u].inptr = 0;
uptr->CMD &= ~(CON_MSK|CON_REQ|CON_INPUT|CON_CR|CON_CANCEL);
uptr->SNS = 0;
sim_activate(uptr, 1000);
}
uint8 scon_startcmd(UNIT *uptr, uint8 cmd) {
int u = (uptr - scon_unit);
sim_debug(DEBUG_CMD, &scon_dev, "%d: Cmd %x %x\n", u, cmd, uptr->CMD);
if ((uptr->CMD & CON_MSK) != 0)
return SNS_BSY;
if ((cmd & 0xf0) != 0) {
uptr->SNS |= SNS_CMDREJ;
return SNS_CHNEND|SNS_DEVEND|SNS_UNITCHK;
}
switch (cmd & 0x7) {
case 2: /* Read command */
sim_debug(DEBUG_CMD, &scon_dev, "%d: Cmd RD\n", u);
if (uptr->CMD & CON_REQ) {
uptr->CMD &= ~CON_REQ;
return SNS_ATTN;
}
if ((uptr->CMD & CON_INPUT) == 0 &&
(scon_data[u].inptr == 0 || uptr->CMD & CON_CR)) {
/* Activate input so we can get response */
if ((uptr->CMD & CON_OUTPUT) != 0) {
tmxr_putc_ln(&scon_ldsc[u], '\r');
tmxr_putc_ln(&scon_ldsc[u], '\n');
uptr->CMD &= ~CON_OUTPUT;
}
tmxr_putc_ln(&scon_ldsc[u], 'I');
tmxr_putc_ln(&scon_ldsc[u], ' ');
}
uptr->IPTR = 0;
uptr->CMD |= cmd & CON_MSK;
uptr->SNS = 0;
return 0;
case 1: /* Write command */
sim_debug(DEBUG_CMD, &scon_dev, "%d: Cmd WR\n", u);
if (uptr->CMD & CON_REQ) {
uptr->CMD &= ~CON_REQ;
return SNS_ATTN;
}
uptr->CMD |= cmd & CON_MSK;
uptr->SNS = 0;
if (uptr->CMD & CON_CR) {
tmxr_putc_ln(&scon_ldsc[u], 'R');
tmxr_putc_ln(&scon_ldsc[u], ' ');
uptr->CMD &= ~CON_CR;
uptr->CMD |= CON_OUTPUT;
}
return 0;
case 3: /* Control */
if (cmd == CON_ALR) {
tmxr_putc_ln(&scon_ldsc[u], '\a');
}
sim_debug(DEBUG_CMD, &scon_dev, "%d: Cmd NOP\n", u);
if (uptr->CMD & CON_REQ) {
uptr->CMD &= ~CON_REQ;
return SNS_ATTN;
}
uptr->SNS = 0;
return SNS_CHNEND|SNS_DEVEND;
case 0: /* Status */
return 0;
case 4: /* Sense */
uptr->CMD |= cmd & CON_MSK;
return 0;
default: /* invalid command */
uptr->SNS |= SNS_CMDREJ;
break;
}
if (uptr->SNS)
return SNS_CHNEND|SNS_DEVEND|SNS_UNITCHK;
return SNS_CHNEND|SNS_DEVEND;
}
/*
* Handle halt I/O instruction by stoping running command.
*/
uint8 scon_haltio(UNIT *uptr) {
uint16 addr = GET_UADDR(uptr->CMD);
DEVICE *dptr = find_dev_from_unit(uptr);
int u = (uptr - scon_unit);
int cmd = uptr->CMD & 0xff;
sim_debug(DEBUG_CMD, dptr, "HLTIO inq %x\n", cmd);
switch (cmd) {
case 0:
case 0x4:
/* Short commands nothing to do */
break;
case CON_WR:
case CON_ACR:
case CON_RD:
uptr->CMD &= ~(CON_MSK|CON_INPUT|CON_CANCEL);
scon_data[u].inptr = 0;
chan_end(addr, SNS_CHNEND|SNS_DEVEND);
break;
}
return 1;
}
/* Handle transfer of data for printer */
t_stat
scon_srv(UNIT *uptr) {
uint16 addr = GET_UADDR(uptr->CMD);
int u = (uptr - scon_unit);
int cmd = uptr->CMD & CON_MSK;
int32 ch;
uint8 data;
int i;
int delay = 1000;
switch (cmd) {
case 4: /* Sense */
sim_debug(DEBUG_CMD, &scon_dev, "%d: Cmd SNS %02x\n", u, uptr->SNS);
/* Check if request pending */
data = uptr->SNS;
chan_write_byte(addr, &data);
chan_end(addr, SNS_CHNEND|SNS_DEVEND);
uptr->CMD &= ~(CON_MSK);
uptr->SNS = 0;
break;
case CON_WR:
case CON_ACR:
sim_debug(DEBUG_CMD, &scon_dev, "%d: Cmd Write\n", u);
if (chan_read_byte(addr, &data)) {
if (cmd == CON_ACR) {
tmxr_putc_ln(&scon_ldsc[u], '\r');
tmxr_putc_ln(&scon_ldsc[u], '\n');
uptr->CMD |= CON_CR;
uptr->CMD &= ~CON_OUTPUT;
}
uptr->CMD &= ~CON_MSK;
chan_end(addr, SNS_CHNEND|SNS_DEVEND);
delay = 40000;
} else {
if (scon_ldsc[u].conn == 0) {
sim_debug(DEBUG_CMD, &scon_dev, "%d: Cmd not connected\n", u);
break;
}
if (data == 0x15) {
tmxr_putc_ln(&scon_ldsc[u], '\r');
tmxr_putc_ln(&scon_ldsc[u], '\n');
uptr->CMD |= CON_CR;
uptr->CMD &= ~CON_OUTPUT;
} else {
ch = ebcdic_to_ascii[data];
if (ch != 0) {
if (!isprint(ch))
ch = '_';
sim_debug(DEBUG_CMD, &scon_dev, "%d: send %02x\n", u, ch);
tmxr_putc_ln(&scon_ldsc[u], ch);
uptr->CMD &= ~CON_OUTPUT;
}
}
}
break;
case CON_RD:
if (uptr->CMD & CON_INPUT) {
uptr->CMD &= ~CON_REQ;
/* Check for empty line, or end of data */
if (scon_data[u].inptr == 0 || uptr->IPTR == scon_data[u].inptr) {
uptr->CMD &= ~CON_INPUT;
scon_data[u].inptr = 0;
cmd = 0;
uptr->CMD &= ~(CON_MSK);
sim_debug(DEBUG_CMD, &scon_dev, "%d: devend\n", u);
if (uptr->CMD & CON_CANCEL) {
uptr->CMD &= ~CON_CANCEL;
chan_end(addr, SNS_CHNEND|SNS_DEVEND|SNS_UNITEXP);
} else {
chan_end(addr, SNS_CHNEND|SNS_DEVEND);
}
break;
}
/* Grab next character and send it to CPU */
data = scon_data[u].ibuff[uptr->IPTR++];
sim_debug(DEBUG_CMD, &scon_dev, "%d: rd %02x\n", u, data);
if (chan_write_byte(addr, &data)) {
uptr->CMD &= ~CON_INPUT;
scon_data[u].inptr = 0;
cmd = 0;
uptr->CMD &= ~(CON_MSK);
sim_debug(DEBUG_CMD, &scon_dev, "%d: devend input\n", u);
if (uptr->CMD & CON_CANCEL) {
uptr->CMD &= ~CON_CANCEL;
chan_end(addr, SNS_CHNEND|SNS_DEVEND|SNS_UNITEXP);
} else {
chan_end(addr, SNS_CHNEND|SNS_DEVEND);
}
}
}
break;
}
ch = tmxr_getc_ln(&scon_ldsc[u]); /* get char */
if ((ch & TMXR_VALID) != 0) {
data = (uint8)(ch & 0xff);
if ((uptr->CMD & CON_INPUT) == 0) {
/* Handle end of buffer */
switch (data) {
case '\r':
case '\n':
sim_debug(DEBUG_DATA, &scon_dev, "%d: ent\n", u);
uptr->CMD |= CON_INPUT;
uptr->CMD |= CON_CR;
uptr->CMD &= ~CON_OUTPUT;
tmxr_putc_ln(&scon_ldsc[u], '\r');
tmxr_putc_ln(&scon_ldsc[u], '\n');
/* Fall through */
case 033: /* request key */
if (cmd != CON_RD) {
uptr->CMD |= CON_REQ;
}
break;
case 0177:
case '\b':
if (scon_data[u].inptr != 0) {
scon_data[u].inptr--;
tmxr_putc_ln(&scon_ldsc[u], '\b');
tmxr_putc_ln(&scon_ldsc[u], ' ');
tmxr_putc_ln(&scon_ldsc[u], '\b');
}
break;
case 03: /* ^C */
uptr->CMD |= CON_CANCEL|CON_INPUT;
break;
case 025: /* ^U clear line */
for (i = scon_data[u].inptr; i> 0; i--) {
tmxr_putc_ln(&scon_ldsc[u], '\b');
tmxr_putc_ln(&scon_ldsc[u], ' ');
tmxr_putc_ln(&scon_ldsc[u], '\b');
}
scon_data[u].inptr = 0;
break;
default:
sim_debug(DEBUG_DATA, &scon_dev, "%d: key '%c'\n", u, ch);
if (scon_data[u].inptr < sizeof(scon_data[u].ibuff)) {
data = ascii_to_ebcdic[data];
if (data == 0xff) {
tmxr_putc_ln(&scon_ldsc[u], '\007');
break;
}
tmxr_putc_ln(&scon_ldsc[u], ebcdic_to_ascii[data]);
scon_data[u].ibuff[scon_data[u].inptr++] = data;
}
break;
}
} else {
if (cmd == CON_RD && data == 03) { /* Cancel */
chan_end(addr, SNS_CHNEND|SNS_DEVEND|SNS_UNITEXP);
uptr->CMD &= ~(CON_INPUT|CON_CANCEL);
scon_data[u].inptr = 0;
cmd = 0;
} else {
sim_debug(DEBUG_CMD, &scon_dev, "%d: error %x\n", u, cmd);
if (cmd == 0)
uptr->CMD |= CON_REQ;
tmxr_putc_ln(&scon_ldsc[u], '\007');
}
}
}
if (cmd == 0 && uptr->CMD & CON_REQ) {
sim_debug(DEBUG_CMD, &scon_dev, "%d: setattn %x\n", u, addr);
set_devattn(addr, SNS_ATTN);
uptr->CMD &= ~CON_REQ;
}
sim_activate(uptr, delay);
return SCPE_OK;
}
/* Handle connect disconnect and data transfer */
t_stat
scon_srvo(UNIT *uptr) {
int ln;
sim_clock_coschedule(uptr, tmxr_poll);
ln = tmxr_poll_conn(&scon_desc); /* look for connect */
if (ln >= 0) { /* got one? */
scon_ldsc[ln].rcve = 1;
sim_debug(DEBUG_DETAIL, &scon_dev, "Inquiry connect %d\n", ln);
}
tmxr_poll_rx(&scon_desc);
tmxr_poll_tx(&scon_desc);
return SCPE_OK;
}
t_stat
scon_reset(DEVICE *dptr)
{
sim_activate(&scon_unit[NUM_DEVS_SCON], tmxr_poll);
return SCPE_OK;
}
t_stat
scon_attach(UNIT * uptr, CONST char *cptr)
{
int u = (uptr - scon_unit);
t_stat r;
r = tmxr_attach(&scon_desc, uptr, cptr);
uptr->CMD &= ~(CON_MSK);
sim_activate(uptr, tmxr_poll);
return r;
}
t_stat
scon_detach(UNIT * uptr)
{
int u = (uptr - scon_unit);
t_stat r;
sim_cancel(uptr);
r = tmxr_detach(&scon_desc, uptr);
return r;
}
t_stat
scon_help(FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, const char *cptr)
{
fprintf (st, "1050 Console Terminal\n");
fprintf (st, "This is the interface from the operator to the system. To request the\n");
fprintf (st, "system to accept input press the <esc> key and wait until the system\n");
fprintf (st, "responds with a line with I as the first character. When you have\n");
fprintf (st, "finished typing your line, press return or enter key. Backspace will\n");
fprintf (st, "delete the last character. All responses from the system are prefixed\n");
fprintf (st, "with a R and blank as the first character. Not all operating systems\n");
fprintf (st, "require the use of <esc> to enter data\n");
return SCPE_OK;
}
const char *
scon_description(DEVICE *dptr)
{
return "1050 Console Terminal";
}
#endif
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