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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 <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 fd;
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()
{
int i;
ASYNC_STRUCT *a1;
ASYNC_STRUCT *a2;
a1 = getivec(12);
a2 = getivec(11);
async = 0;
if (a1)
async = a1;
if (a2)
async = a2;
if (a1 && a2)
{
if (a1 < a2)
async = a1;
else
async = a2;
}
if (async == 0)
{
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;
if (iov > 0x300)
return 1;
else
return 2;
}
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;
{
scb->fd = dos_async_init();
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 -2; /* Timeout, I guess */
}
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);
}
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);
}
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