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