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- /* Remote serial interface for local (hardwired) serial ports for GO32.
- Copyright 1992, 1993 Free Software Foundation, Inc.
-
- This file is part of GDB.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- #include "defs.h"
- #include "serial.h"
- #include <dos.h>
-
- /* This is unused for now. We just return a placeholder. */
- struct go32_ttystate
- {
- int bogus;
- };
-
- typedef struct
- {
- short jmp_op;
- short signature;
- short version;
- short buffer_start;
- short buffer_end;
- short getp;
- short putp;
- short iov;
- }
- ASYNC_STRUCT;
-
- static int go32_open PARAMS ((serial_t scb, const char *name));
- static void go32_raw PARAMS ((serial_t scb));
- static int go32_readchar PARAMS ((serial_t scb, int timeout));
- static int go32_setbaudrate PARAMS ((serial_t scb, int rate));
- static int go32_write PARAMS ((serial_t scb, const char *str, int len));
- static void go32_close PARAMS ((serial_t scb));
- static serial_ttystate go32_get_tty_state PARAMS ((serial_t scb));
- static int go32_set_tty_state PARAMS ((serial_t scb, serial_ttystate state));
- static char *aptr PARAMS ((short p));
- static ASYNC_STRUCT *getivec PARAMS ((int which));
- static int dos_async_init PARAMS ((int port));
- static void dos_async_tx PARAMS ((const char c));
- static int dos_async_rx PARAMS (());
- static int dosasync_read PARAMS ((int fd, char *buf, int len, int timeout));
- static int dosasync_write PARAMS ((int fd, const char *buf, int len));
-
- #define SIGNATURE 0x4154
- #define VERSION 1
- #define OFFSET 0x104
-
- #define peek(a,b) (*(unsigned short *)(0xe0000000 + (a)*16 + (b)))
-
- static volatile ASYNC_STRUCT *async;
- static int iov;
- #define com_rb iov
- #define com_tb iov
- #define com_ier iov+1
- #define com_ifr iov+2
- #define com_bfr iov+3
- #define com_mcr iov+4
- #define com_lsr iov+5
- #define com_msr iov+6
-
- static char *
- aptr (p)
- short p;
- {
- return (char *) ((unsigned) async - OFFSET + p);
- }
-
- static ASYNC_STRUCT *
- getivec (int which)
- {
- ASYNC_STRUCT *a;
-
- if (peek (0, which * 4) != OFFSET)
- return 0;
-
- a = (ASYNC_STRUCT *) (0xe0000000 + peek (0, which * 4 + 2) * 16 + peek (0, which * 4));
-
- if (a->signature != SIGNATURE)
- return 0;
-
- if (a->version != VERSION)
- return 0;
-
- return a;
- }
-
- static int
- dos_async_init (port)
- int port;
- {
- switch (port)
- {
- case 1:
- async = getivec (12);
- break;
- case 2:
- async = getivec (11);
- break;
- default:
- return 0;
- }
-
- if (!async)
- {
- error ("GDB cannot connect to asynctsr program, check that it is installed\n\
- and that serial I/O is not being redirected (perhaps by NFS)\n\n\
- example configuration:\n\
- C> mode com%d:9600,n,8,1,p\n\
- C> asynctsr %d\n\
- C> gdb \n", port, port);
- }
-
- iov = async->iov;
- outportb (com_ier, 0x0f);
- outportb (com_bfr, 0x03);
- outportb (com_mcr, 0x0b);
- async->getp = async->putp = async->buffer_start;
-
- return 1;
- }
-
- static void
- dos_async_tx (c)
- const char c;
- {
- while (~inportb (com_lsr) & 0x20)
- ;
- outportb (com_tb, c);
- }
-
- #define dos_async_ready() (async->getp != async->putp)
-
- static int
- dos_async_rx ()
- {
- char rv;
-
- while (!dos_async_ready ())
- {
- if (kbhit ())
- {
- printf_unfiltered ("abort!\n");
- return 0;
- }
- }
-
- rv = *aptr (async->getp++);
- if (async->getp >= async->buffer_end)
- async->getp = async->buffer_start;
-
- return rv;
- }
-
- static int
- dosasync_read (fd, buf, len, timeout)
- int fd;
- char *buf;
- int len;
- int timeout;
- {
- long now, then;
- int i;
-
- time (&now);
- then = now + timeout;
-
- for (i = 0; i < len; i++)
- {
- if (timeout)
- {
- while (!dos_async_ready ())
- {
- time (&now);
- if (now >= then)
- return i;
- }
- }
- *buf++ = dos_async_rx ();
- }
- return len;
- }
-
- static int
- dosasync_write (fd, buf, len)
- int fd;
- const char *buf;
- int len;
- {
- int l;
-
- for (l = 0; l < len; l++)
- dos_async_tx (*buf++);
-
- return len;
- }
-
- static int
- go32_open (scb, name)
- serial_t scb;
- const char *name;
- {
- int port;
-
- if (strncasecmp (name, "com", 3) != 0)
- {
- errno = ENOENT;
- return -1;
- }
-
- port = name[3] - '0';
-
- if ((port != 1) && (port != 2))
- {
- errno = ENOENT;
- return -11;
- }
-
- scb->fd = dos_async_init (port);
- if (!scb->fd)
- return -1;
-
- return 0;
- }
-
- static int
- go32_noop (scb)
- serial_t scb;
- {
- return 0;
- }
-
- static void
- go32_raw (scb)
- serial_t scb;
- {
- /* Always in raw mode */
- }
-
- static int
- go32_readchar (scb, timeout)
- serial_t scb;
- int timeout;
- {
- char buf;
-
- /* Shortcut for polling */
- if (timeout == 0)
- {
- if (dos_async_ready ())
- {
- return dos_async_rx ();
- }
- return SERIAL_TIMEOUT;
- }
-
- if (dosasync_read (scb->fd, &buf, 1, timeout))
- return buf;
- else
- return SERIAL_TIMEOUT;
- }
-
- /* go32_{get set}_tty_state() are both dummys to fill out the function
- vector. Someday, they may do something real... */
-
- static serial_ttystate
- go32_get_tty_state (scb)
- serial_t scb;
- {
- struct go32_ttystate *state;
-
- state = (struct go32_ttystate *) xmalloc (sizeof *state);
-
- return (serial_ttystate) state;
- }
-
- static int
- go32_set_tty_state (scb, ttystate)
- serial_t scb;
- serial_ttystate ttystate;
- {
- return 0;
- }
-
- static int
- go32_noflush_set_tty_state (scb, new_ttystate, old_ttystate)
- serial_t scb;
- serial_ttystate new_ttystate;
- serial_ttystate old_ttystate;
- {
- return 0;
- }
-
- static void
- go32_print_tty_state (scb, ttystate)
- serial_t scb;
- serial_ttystate ttystate;
- {
- /* Nothing to print. */
- return;
- }
-
- static int
- go32_setbaudrate (scb, rate)
- serial_t scb;
- int rate;
- {
- return 0;
- }
-
- static int
- go32_write (scb, str, len)
- serial_t scb;
- const char *str;
- int len;
- {
- dosasync_write (scb->fd, str, len);
-
- return 0;
- }
-
- static void
- go32_close (scb)
- serial_t scb;
- {
- }
-
- static struct serial_ops go32_ops =
- {
- "hardwire",
- 0,
- go32_open,
- go32_close,
- go32_readchar,
- go32_write,
- go32_noop, /* flush output */
- go32_noop, /* flush input */
- go32_noop, /* send break -- currently used only for nindy */
- go32_raw,
- go32_get_tty_state,
- go32_set_tty_state,
- go32_print_tty_state,
- go32_noflush_set_tty_state,
- go32_setbaudrate,
- };
-
- void
- _initialize_ser_go32 ()
- {
- serial_add_interface (&go32_ops);
- }
-