home *** CD-ROM | disk | FTP | other *** search
- /* 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 <sys/dos.h>
-
- #define SIGNATURE 0x4154
- #define VERSION 1
- #define OFFSET 0x104
-
- #define peek(a,b) (*(unsigned short *)(0xe0000000 + (a)*16 + (b)))
-
- typedef struct {
- short jmp_op;
- short signature;
- short version;
- short buffer_start;
- short buffer_end;
- short getp;
- short putp;
- short iov;
- } ASYNC_STRUCT;
-
- static 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 int
- strncasecmp(str1, str2, len)
- char *str1, *str2;
- register int len;
- {
- unsigned char c1, c2;
-
- for (; len != 0; --len)
- {
- c1 = *str1++;
- c2 = *str2++;
-
- if (toupper(c1) != toupper(c2))
- return toupper(c1) - toupper(c2);
-
- if (c1 == '\0')
- return 0;
- }
- return 0;
- }
-
- 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;
- {
- int i;
-
- switch (port)
- {
- case 1:
- async = getivec (12);
- break;
- case 2:
- async = getivec (11);
- break;
- default:
- return 0;
- }
-
- if (!async)
- {
- error("GDB can not 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 com2:9600,n,8,1,p\n\
- C> asynctsr 2\n\
- C> gdb \n");
-
- }
-
- 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);
- }
-
- static int
- dos_async_ready()
- {
- return (async->getp != async->putp);
- }
-
- static int
- dos_async_rx()
- {
- char rv;
-
- while (!dos_async_ready())
- if (kbhit())
- {
- printf("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 l = len;
-
- time (&now);
- then = now + timeout;
-
- while (l--)
- {
- if (timeout)
- {
- while (!dos_async_ready())
- {
- time (&now);
- if (now >= then)
- return len - l - 1;
- }
- }
- *buf++ = dos_async_rx();
- }
-
- return len;
- }
-
- static int
- dosasync_write(fd, buf, len)
- int fd;
- const char *buf;
- int len;
- {
- int l = len;
-
- while (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 void
- go32_raw (scb)
- serial_t scb;
- {
- /* Always in raw mode */
- }
-
- static int
- go32_readchar (scb, timeout)
- serial_t scb;
- int timeout;
- {
- char buf;
-
- if (dosasync_read(scb->fd, &buf, 1, timeout))
- return buf;
- else
- return SERIAL_TIMEOUT;
- }
-
- 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 ()
- {
- }
-
- static void
- go32_restore (scb)
- serial_t scb;
- {
- }
-
- static struct serial_ops go32_ops =
- {
- "hardwire",
- 0,
- go32_open,
- go32_close,
- go32_readchar,
- go32_write,
- go32_raw,
- go32_restore,
- go32_setbaudrate
- };
-
- _initialize_ser_go32 ()
- {
- serial_add_interface (&go32_ops);
- }
-