[deliverable/binutils-gdb.git] / gdb / ser-e7kpc.c

/* Remote serial interface using Hitachi E7000 PC ISA card in a PC

   Copyright 1994 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.  */

#if defined __GO32__ || defined _WIN32
#include "defs.h"
#include "serial.h"
#include "gdb_string.h"

/* MSVC uses strnicmp instead of strncasecmp */
#ifdef _MSC_VER
#define strncasecmp strnicmp
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#define W32SUT_32
#include "mswin/w32sut.h"
#endif

#ifdef __GO32__
#include <sys/dos.h>
#endif

static int e7000pc_open PARAMS ((serial_t scb, const char *name));
static void e7000pc_raw PARAMS ((serial_t scb));
static int e7000pc_readchar PARAMS ((serial_t scb, int timeout));
static int e7000pc_setbaudrate PARAMS ((serial_t scb, int rate));
static int e7000pc_write PARAMS ((serial_t scb, const char *str, int len));
static void e7000pc_close PARAMS ((serial_t scb));
static serial_ttystate e7000pc_get_tty_state PARAMS ((serial_t scb));
static int e7000pc_set_tty_state PARAMS ((serial_t scb, serial_ttystate state));
static char *aptr PARAMS ((short p));

static int dos_async_init PARAMS ((int port));
static void dos_async_tx PARAMS ((const char c));
static int dos_async_rx PARAMS (());


#define OFF_DPD 	0x0000
#define OFF_DDP 	0x1000
#define OFF_CPD 	0x2000
#define OFF_CDP 	0x2400
#define OFF_FA  	0x3000
#define OFF_FB  	0x3002
#define OFF_FC  	0x3004
#define OFF_IRQTOD	0x3008
#define OFF_IRQTOP 	0x300a
#define OFF_READY  	0x300c
#define OFF_PON    	0x300e

#define IDLE       0x0000           
#define CMD_CI     0x4349           
#define CMD_CO     0x434f           
#define CMD_LO     0x4c4f           
#define CMD_LS     0x4c53           
#define CMD_SV     0x5356           
#define CMD_SS     0x5353           
#define CMD_OK     0x4f4b           
#define CMD_ER     0x4552           
#define CMD_NF     0x4e46           
#define CMD_AB     0x4142           
#define CMD_ED     0x4544           
#define CMD_CE     0x4345           

static unsigned long fa;
static unsigned long irqtod;
static unsigned long ready;
static unsigned long fb;
static unsigned long cpd ;
static unsigned long cdp ;
static unsigned long ready;
static unsigned long pon;
static unsigned long irqtop;
static unsigned long board_at;

#ifdef __GO32__

#define SET_BYTE(x,y)   { char _buf = y;dosmemput(&_buf,1, x);}
#define SET_WORD(x,y)   { short _buf = y;dosmemput(&_buf,2, x);}
#define GET_BYTE(x)     ( dosmemget(x,1,&bb), bb)
#define GET_WORD(x)     ( dosmemget(x,2,&sb), sb)
static unsigned char bb;
static unsigned short sb;

#else /* win32 */

#define SET_BYTE(x,y)   *(volatile unsigned char *)(x) = (y)
#define SET_WORD(x,y)   *(volatile unsigned short *)(x) = (y)
#define GET_BYTE(x)     (*(volatile unsigned char *)(x))
#define GET_WORD(x)     (*(volatile unsigned short *)(x))
#define dosmemget(FROM, LEN, TO) memcpy ((void *)(TO), (void *)(FROM), (LEN))
#define dosmemput(FROM, LEN, TO) memcpy ((void *)(TO), (void *)(FROM), (LEN))
#endif

static struct sw 
{
  int sw;
  int addr;
} sigs[] = {
  {0x14, 0xd0000},
  {0x15, 0xd4000},
  {0x16, 0xd8000},
  {0x17, 0xdc000},
  0};

#ifndef __GO32__
/* Get the base of the data segment.  This is needed to calculate the offset
   between data segment addresses and the base of linear memory, which is where
   device registers reside.  Note that this is really only necessary for
   Win32s, since Win95 and NT keep the data segment at linear 0.  */

static unsigned long
get_ds_base (void)
{
  unsigned short dsval;
  LDT_ENTRY ldt;
  unsigned long dsbase;

  __asm
    {
      mov dsval,ds
    }

  dsbase = 0;

  GetThreadSelectorEntry (GetCurrentThread(), dsval, &ldt);

  dsbase = ldt.HighWord.Bits.BaseHi << 24 | ldt.HighWord.Bits.BaseMid << 16
	     | ldt.BaseLow;

  return dsbase;
}
#else /* !__GO32__ */
#define get_ds_base() 0
#endif /* __GO32__ */ 

static int
e7000pc_init ()
{
  int try;
  unsigned long dsbase;
  
  dsbase = get_ds_base ();

  /* Look around in memory for the board's signature */

  for (try = 0; sigs[try].sw; try++)
    {
      int val;
      board_at = sigs[try].addr - dsbase;
      fa = board_at + OFF_FA;
      fb = board_at + OFF_FB;
      cpd = board_at + OFF_CPD;
      cdp = board_at + OFF_CDP;
      ready =board_at + OFF_READY;
      pon = board_at + OFF_PON;	      
      irqtop = board_at + OFF_IRQTOP;
      irqtod = board_at + OFF_IRQTOD;
      
      val = GET_WORD (ready);

      if (val == (0xaaa0  | sigs[try].sw))
	{
	  if (GET_WORD (pon) & 0xf)
	    {
	      SET_WORD (fa, 0);
	      SET_WORD (fb, 0);

	      SET_WORD (irqtop, 1); /* Disable interrupts from e7000 */
	      SET_WORD (ready, 1);
	      printf_filtered ("\nConnected to the E7000PC at address 0x%x\n", 
			       sigs[try].addr);
	      return 1;	      
	    }
	  error ("The E7000 PC board is working, but the E7000 is turned off.\n");
	  return 0;
	}
    }

  error ("GDB cannot connect to the E7000 PC board, check that it is installed\n\
and that the switch settings are correct.  Some other DOS programs can \n\
stop the board from working.  Try starting from a very minimal boot, \n\
perhaps you need to disable EMM386 over the region where the board has\n\
its I/O space, remove other unneeded cards, etc etc\n");
  return 0;

}

static int pbuf_size;
static int pbuf_index;

/* Return next byte from cdp.  If no more, then return -1.  */

static int 
e7000_get (void)
{
  static char pbuf[1000];
  char tmp[1000];
  int x;

  if (pbuf_index < pbuf_size) 
    {
      x = pbuf[pbuf_index++];
    }
  else if ((GET_WORD (fb) & 1))
    {
      int i;
      pbuf_size = GET_WORD (cdp + 2);

      dosmemget (cdp + 8, pbuf_size + 1, tmp);

      /* Tell the E7000 we've eaten */
      SET_WORD (fb, 0);	
      /* Swap it around */
      for (i = 0; i < pbuf_size; i++) 
	{
	  pbuf[i] = tmp[i^1];
	}
      pbuf_index = 0;
      x =  pbuf[pbuf_index++];
    }
  else 
    { 
      x = -1;
    }
  return x;
}

/* Works just like read(), except that it takes a TIMEOUT in seconds.  Note
   that TIMEOUT == 0 is a poll, and TIMEOUT == -1 means wait forever. */

static int
dosasync_read (fd, buf, len, timeout)
     int fd;
     char *buf;
     int len;
     int timeout;

{
  long now;
  long then;
  int i = 0;

  /* Then look for some more if we're still hungry */
  time (&now);
  then = now + timeout;
  while (i < len)
    {
      int ch = e7000_get();
      
      /* While there's room in the buffer, and we've already
	 read the stuff in, suck it over */
      if (ch != -1) 
	{
	  buf[i++] = ch;
	  while (i < len && pbuf_index < pbuf_size )
	    {
	      ch = e7000_get();
	      if (ch == -1)
		break;
	      buf[i++] = ch;
	    }
	}

      time (&now);

      if (timeout == 0)
	return i;
      if (now >= then && timeout > 0)
	{
	  return i;
	}
    }
  return len;
}


static int
dosasync_write (fd, buf, len)
     int fd;
     const char *buf;
     int len;
{
  int i;
  char dummy[1000];  
  
  /* Construct copy locally */
  ((short *)dummy)[0] = CMD_CI;
  ((short *)dummy)[1] = len;
  ((short *)dummy)[2] = 0;
  ((short *)dummy)[3] = 0;
  for (i = 0; i < len ; i++) 
    {
      dummy[8 + i ^ 1] = buf[i];
    }

  /* Wait for the card to get ready */
  while (GET_WORD (fa) & 1) ;

  /* Blast onto the ISA card */
  dosmemput (dummy, 8 + len + 1,  cpd);

  SET_WORD (fa, 1);
  SET_WORD (irqtod, 1); /* Interrupt the E7000 */

  return len;
}

static int
e7000pc_open (scb, name)
     serial_t scb;
     const char *name;
{
  if (strncasecmp (name, "pc", 2) != 0)
    {
      errno = ENOENT;
      return -1;
    }

  scb->fd = e7000pc_init ();

  if (!scb->fd)
    return -1;

  return 0;
}

static int
e7000pc_noop (scb)
     serial_t scb;
{
  return 0;
}

static void
e7000pc_raw (scb)
     serial_t scb;
{
  /* Always in raw mode */
}

static int
e7000pc_readchar (scb, timeout)
     serial_t scb;
     int timeout;
{
  char buf;

 top:

  if (dosasync_read (scb->fd, &buf, 1, timeout))
    {
      if (buf == 0) goto top;
      return buf;
    }
  else
    return SERIAL_TIMEOUT;
}

struct e7000pc_ttystate {
  int dummy;
};

/* e7000pc_{get set}_tty_state() are both dummys to fill out the function
   vector.  Someday, they may do something real... */

static serial_ttystate
e7000pc_get_tty_state (scb)
     serial_t scb;
{
  struct e7000pc_ttystate *state;

  state = (struct e7000pc_ttystate *) xmalloc (sizeof *state);

  return (serial_ttystate) state;
}

static int
e7000pc_set_tty_state (scb, ttystate)
     serial_t scb;
     serial_ttystate ttystate;
{
  return 0;
}

static int
e7000pc_noflush_set_tty_state (scb, new_ttystate, old_ttystate)
     serial_t scb;
     serial_ttystate new_ttystate;
     serial_ttystate old_ttystate;
{
  return 0;
}

static void
e7000pc_print_tty_state (scb, ttystate)
     serial_t scb;
     serial_ttystate ttystate;
{
  /* Nothing to print.  */
  return;
}

static int
e7000pc_setbaudrate (scb, rate)
     serial_t scb;
     int rate;
{
  return 0;
}

static int
e7000pc_write (scb, str, len)
     serial_t scb;
     const char *str;
     int len;
{
  dosasync_write (scb->fd, str, len);

  return 0;
}

static void
e7000pc_close (scb)
     serial_t scb;
{
}

static struct serial_ops e7000pc_ops =
{
  "pc",
  0,
  e7000pc_open,
  e7000pc_close,
  e7000pc_readchar,
  e7000pc_write,
  e7000pc_noop,			/* flush output */
  e7000pc_noop,			/* flush input */
  e7000pc_noop,			/* send break -- currently used only for nindy */
  e7000pc_raw,
  e7000pc_get_tty_state,
  e7000pc_set_tty_state,
  e7000pc_print_tty_state,
  e7000pc_noflush_set_tty_state,
  e7000pc_setbaudrate,
};

void
_initialize_ser_e7000pc ()
{
  serial_add_interface (&e7000pc_ops);
}
#else

void
_initialize_ser_e7000pc ()
{

}
#endif
Commit	Line	Data
55679787 SC	1	/* Remote serial interface using Hitachi E7000 PC ISA card in a PC
	2
	3	Copyright 1994 Free Software Foundation, Inc.
	4
	5	This file is part of GDB.
	6
	7	This program is free software; you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
	9	the Free Software Foundation; either version 2 of the License, or
	10	(at your option) any later version.
	11
	12	This program is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	GNU General Public License for more details.
	16
	17	You should have received a copy of the GNU General Public License
	18	along with this program; if not, write to the Free Software
4ce7ba51	19	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
16a43bf4	20
4ce7ba51 SG	21	#if defined __GO32__ \|\| defined _WIN32
	22	#include "defs.h"
	23	#include "serial.h"
	24	#include "gdb_string.h"
16a43bf4	25
4ce7ba51	26	/* MSVC uses strnicmp instead of strncasecmp */
16a43bf4	27	#ifdef _MSC_VER
5b59224e	28	#define strncasecmp strnicmp
4ce7ba51 SG	29	#define WIN32_LEAN_AND_MEAN
4ce7ba51 SG	30	#include <windows.h>
16a43bf4	31	#define W32SUT_32
ce4450fa	32	#include "mswin/w32sut.h"
16a43bf4	33	#endif
16a43bf4	34
4ce7ba51	35	#ifdef __GO32__
5b59224e	36	#include <sys/dos.h>
4ce7ba51	37	#endif
55679787 SC	38
	39	static int e7000pc_open PARAMS ((serial_t scb, const char *name));
	40	static void e7000pc_raw PARAMS ((serial_t scb));
	41	static int e7000pc_readchar PARAMS ((serial_t scb, int timeout));
	42	static int e7000pc_setbaudrate PARAMS ((serial_t scb, int rate));
	43	static int e7000pc_write PARAMS ((serial_t scb, const char *str, int len));
	44	static void e7000pc_close PARAMS ((serial_t scb));
	45	static serial_ttystate e7000pc_get_tty_state PARAMS ((serial_t scb));
	46	static int e7000pc_set_tty_state PARAMS ((serial_t scb, serial_ttystate state));
	47	static char *aptr PARAMS ((short p));
	48
	49	static int dos_async_init PARAMS ((int port));
	50	static void dos_async_tx PARAMS ((const char c));
	51	static int dos_async_rx PARAMS (());
	52
	53
	54
	55	#define OFF_DPD 0x0000
	56	#define OFF_DDP 0x1000
	57	#define OFF_CPD 0x2000
	58	#define OFF_CDP 0x2400
	59	#define OFF_FA 0x3000
	60	#define OFF_FB 0x3002
	61	#define OFF_FC 0x3004
	62	#define OFF_IRQTOD 0x3008
	63	#define OFF_IRQTOP 0x300a
	64	#define OFF_READY 0x300c
	65	#define OFF_PON 0x300e
	66
	67	#define IDLE 0x0000
	68	#define CMD_CI 0x4349
	69	#define CMD_CO 0x434f
	70	#define CMD_LO 0x4c4f
	71	#define CMD_LS 0x4c53
	72	#define CMD_SV 0x5356
	73	#define CMD_SS 0x5353
	74	#define CMD_OK 0x4f4b
	75	#define CMD_ER 0x4552
	76	#define CMD_NF 0x4e46
	77	#define CMD_AB 0x4142
	78	#define CMD_ED 0x4544
	79	#define CMD_CE 0x4345
	80
	81	static unsigned long fa;
	82	static unsigned long irqtod;
	83	static unsigned long ready;
	84	static unsigned long fb;
	85	static unsigned long cpd ;
	86	static unsigned long cdp ;
	87	static unsigned long ready;
	88	static unsigned long pon;
	89	static unsigned long irqtop;
	90	static unsigned long board_at;
	91
4ce7ba51	92	#ifdef __GO32__
5b59224e	93
55679787 SC	94	#define SET_BYTE(x,y) { char _buf = y;dosmemput(&_buf,1, x);}
	95	#define SET_WORD(x,y) { short _buf = y;dosmemput(&_buf,2, x);}
	96	#define GET_BYTE(x) ( dosmemget(x,1,&bb), bb)
	97	#define GET_WORD(x) ( dosmemget(x,2,&sb), sb)
55679787 SC	98	static unsigned char bb;
	99	static unsigned short sb;
	100
4ce7ba51 SG	101	#else /* win32 */
	102
	103	#define SET_BYTE(x,y) (volatile unsigned char )(x) = (y)
	104	#define SET_WORD(x,y) (volatile unsigned short )(x) = (y)
	105	#define GET_BYTE(x) ((volatile unsigned char )(x))
	106	#define GET_WORD(x) ((volatile unsigned short )(x))
	107	#define dosmemget(FROM, LEN, TO) memcpy ((void )(TO), (void )(FROM), (LEN))
	108	#define dosmemput(FROM, LEN, TO) memcpy ((void )(TO), (void )(FROM), (LEN))
	109	#endif
55679787 SC	110
	111	static struct sw
	112	{
	113	int sw;
	114	int addr;
	115	} sigs[] = {
	116	{0x14, 0xd0000},
	117	{0x15, 0xd4000},
	118	{0x16, 0xd8000},
	119	{0x17, 0xdc000},
	120	0};
	121
4ce7ba51 SG	122	#ifndef __GO32__
	123	/* Get the base of the data segment. This is needed to calculate the offset
	124	between data segment addresses and the base of linear memory, which is where
	125	device registers reside. Note that this is really only necessary for
	126	Win32s, since Win95 and NT keep the data segment at linear 0. */
	127
	128	static unsigned long
	129	get_ds_base (void)
	130	{
	131	unsigned short dsval;
	132	LDT_ENTRY ldt;
	133	unsigned long dsbase;
	134
	135	__asm
	136	{
	137	mov dsval,ds
	138	}
	139
	140	dsbase = 0;
	141
	142	GetThreadSelectorEntry (GetCurrentThread(), dsval, &ldt);
	143
	144	dsbase = ldt.HighWord.Bits.BaseHi << 24 \| ldt.HighWord.Bits.BaseMid << 16
	145	\| ldt.BaseLow;
	146
	147	return dsbase;
	148	}
	149	#else /* !__GO32__ */
	150	#define get_ds_base() 0
	151	#endif /* __GO32__ */
	152
55679787 SC	153	static int
	154	e7000pc_init ()
	155	{
55679787	156	int try;
4ce7ba51	157	unsigned long dsbase;
55679787	158
4ce7ba51	159	dsbase = get_ds_base ();
55679787	160
4ce7ba51 SG	161	/* Look around in memory for the board's signature */
	162
	163	for (try = 0; sigs[try].sw; try++)
55679787 SC	164	{
55679787 SC	165	int val;
4ce7ba51	166	board_at = sigs[try].addr - dsbase;
55679787 SC	167	fa = board_at + OFF_FA;
	168	fb = board_at + OFF_FB;
	169	cpd = board_at + OFF_CPD;
	170	cdp = board_at + OFF_CDP;
	171	ready =board_at + OFF_READY;
	172	pon = board_at + OFF_PON;
	173	irqtop = board_at + OFF_IRQTOP;
	174	irqtod = board_at + OFF_IRQTOD;
4ce7ba51	175
55679787 SC	176	val = GET_WORD (ready);
	177
	178	if (val == (0xaaa0 \| sigs[try].sw))
	179	{
4ce7ba51	180	if (GET_WORD (pon) & 0xf)
55679787	181	{
4ce7ba51 SG	182	SET_WORD (fa, 0);
4ce7ba51 SG	183	SET_WORD (fb, 0);
55679787	184
4ce7ba51	185	SET_WORD (irqtop, 1); /* Disable interrupts from e7000 */
55679787 SC	186	SET_WORD (ready, 1);
	187	printf_filtered ("\nConnected to the E7000PC at address 0x%x\n",
	188	sigs[try].addr);
	189	return 1;
	190	}
	191	error ("The E7000 PC board is working, but the E7000 is turned off.\n");
	192	return 0;
	193	}
	194	}
	195
	196	error ("GDB cannot connect to the E7000 PC board, check that it is installed\n\
	197	and that the switch settings are correct. Some other DOS programs can \n\
	198	stop the board from working. Try starting from a very minimal boot, \n\
	199	perhaps you need to disable EMM386 over the region where the board has\n\
	200	its I/O space, remove other unneeded cards, etc etc\n");
	201	return 0;
	202
	203	}
	204
	205	static int pbuf_size;
	206	static int pbuf_index;
	207
4ce7ba51 SG	208	/* Return next byte from cdp. If no more, then return -1. */
	209
	210	static int
	211	e7000_get (void)
55679787 SC	212	{
	213	static char pbuf[1000];
	214	char tmp[1000];
	215	int x;
4ce7ba51	216
55679787 SC	217	if (pbuf_index < pbuf_size)
	218	{
	219	x = pbuf[pbuf_index++];
	220	}
4ce7ba51	221	else if ((GET_WORD (fb) & 1))
55679787 SC	222	{
55679787 SC	223	int i;
4ce7ba51	224	pbuf_size = GET_WORD (cdp + 2);
55679787 SC	225
	226	dosmemget (cdp + 8, pbuf_size + 1, tmp);
	227
	228	/* Tell the E7000 we've eaten */
4ce7ba51	229	SET_WORD (fb, 0);
55679787 SC	230	/* Swap it around */
	231	for (i = 0; i < pbuf_size; i++)
	232	{
	233	pbuf[i] = tmp[i^1];
	234	}
	235	pbuf_index = 0;
	236	x = pbuf[pbuf_index++];
	237	}
	238	else
	239	{
	240	x = -1;
	241	}
	242	return x;
	243	}
	244
4ce7ba51 SG	245	/* Works just like read(), except that it takes a TIMEOUT in seconds. Note
	246	that TIMEOUT == 0 is a poll, and TIMEOUT == -1 means wait forever. */
	247
55679787 SC	248	static int
	249	dosasync_read (fd, buf, len, timeout)
	250	int fd;
	251	char *buf;
	252	int len;
	253	int timeout;
	254
	255	{
	256	long now;
	257	long then;
	258	int i = 0;
55679787 SC	259
	260	/* Then look for some more if we're still hungry */
	261	time (&now);
	262	then = now + timeout;
	263	while (i < len)
	264	{
	265	int ch = e7000_get();
	266
	267	/* While there's room in the buffer, and we've already
4ce7ba51	268	read the stuff in, suck it over */
55679787 SC	269	if (ch != -1)
	270	{
	271	buf[i++] = ch;
	272	while (i < len && pbuf_index < pbuf_size )
	273	{
	274	ch = e7000_get();
	275	if (ch == -1)
	276	break;
	277	buf[i++] = ch;
	278	}
	279	}
	280
	281	time (&now);
	282
4ce7ba51 SG	283	if (timeout == 0)
	284	return i;
	285	if (now >= then && timeout > 0)
55679787 SC	286	{
	287	return i;
	288	}
	289	}
	290	return len;
	291	}
	292
	293
	294	static int
	295	dosasync_write (fd, buf, len)
	296	int fd;
	297	const char *buf;
	298	int len;
	299	{
	300	int i;
	301	char dummy[1000];
55679787 SC	302
	303	/* Construct copy locally */
	304	((short *)dummy)[0] = CMD_CI;
	305	((short *)dummy)[1] = len;
	306	((short *)dummy)[2] = 0;
	307	((short *)dummy)[3] = 0;
	308	for (i = 0; i < len ; i++)
	309	{
	310	dummy[8 + i ^ 1] = buf[i];
	311	}
	312
	313	/* Wait for the card to get ready */
4ce7ba51	314	while (GET_WORD (fa) & 1) ;
55679787 SC	315
	316	/* Blast onto the ISA card */
	317	dosmemput (dummy, 8 + len + 1, cpd);
	318
4ce7ba51 SG	319	SET_WORD (fa, 1);
4ce7ba51 SG	320	SET_WORD (irqtod, 1); /* Interrupt the E7000 */
55679787 SC	321
	322	return len;
	323	}
	324
	325	static int
	326	e7000pc_open (scb, name)
	327	serial_t scb;
	328	const char *name;
	329	{
	330	if (strncasecmp (name, "pc", 2) != 0)
	331	{
	332	errno = ENOENT;
	333	return -1;
	334	}
4ce7ba51	335
55679787 SC	336	scb->fd = e7000pc_init ();
	337
	338	if (!scb->fd)
	339	return -1;
	340
	341	return 0;
	342	}
	343
	344	static int
	345	e7000pc_noop (scb)
	346	serial_t scb;
	347	{
	348	return 0;
	349	}
	350
	351	static void
	352	e7000pc_raw (scb)
	353	serial_t scb;
	354	{
	355	/* Always in raw mode */
	356	}
	357
	358	static int
	359	e7000pc_readchar (scb, timeout)
	360	serial_t scb;
	361	int timeout;
	362	{
	363	char buf;
	364
	365	top:
	366
	367	if (dosasync_read (scb->fd, &buf, 1, timeout))
	368	{
	369	if (buf == 0) goto top;
	370	return buf;
	371	}
	372	else
	373	return SERIAL_TIMEOUT;
	374	}
	375
	376	struct e7000pc_ttystate {
	377	int dummy;
	378	};
	379
	380	/* e7000pc_{get set}_tty_state() are both dummys to fill out the function
	381	vector. Someday, they may do something real... */
	382
	383	static serial_ttystate
	384	e7000pc_get_tty_state (scb)
	385	serial_t scb;
	386	{
	387	struct e7000pc_ttystate *state;
	388
	389	state = (struct e7000pc_ttystate ) xmalloc (sizeof state);
	390
	391	return (serial_ttystate) state;
	392	}
	393
	394	static int
	395	e7000pc_set_tty_state (scb, ttystate)
	396	serial_t scb;
	397	serial_ttystate ttystate;
	398	{
	399	return 0;
400	}
401
402	static int
403	e7000pc_noflush_set_tty_state (scb, new_ttystate, old_ttystate)
404	serial_t scb;
405	serial_ttystate new_ttystate;
406	serial_ttystate old_ttystate;
407	{
408	return 0;
409	}
410
411	static void
412	e7000pc_print_tty_state (scb, ttystate)
413	serial_t scb;
414	serial_ttystate ttystate;
415	{
416	/* Nothing to print. */
417	return;
418	}
419
420	static int
421	e7000pc_setbaudrate (scb, rate)
422	serial_t scb;
423	int rate;
424	{
425	return 0;
426	}
427
428	static int
429	e7000pc_write (scb, str, len)
430	serial_t scb;
431	const char *str;
432	int len;
433	{
434	dosasync_write (scb->fd, str, len);
435
436	return 0;
437	}
438
439	static void
440	e7000pc_close (scb)
441	serial_t scb;
442	{
443	}
444
445	static struct serial_ops e7000pc_ops =
446	{
447	"pc",
448	0,
449	e7000pc_open,
450	e7000pc_close,
451	e7000pc_readchar,
452	e7000pc_write,
453	e7000pc_noop, /* flush output */
454	e7000pc_noop, /* flush input */
455	e7000pc_noop, /* send break -- currently used only for nindy */
456	e7000pc_raw,
457	e7000pc_get_tty_state,
458	e7000pc_set_tty_state,
459	e7000pc_print_tty_state,
460	e7000pc_noflush_set_tty_state,
461	e7000pc_setbaudrate,
462	};
463
464	void
465	_initialize_ser_e7000pc ()
466	{
467	serial_add_interface (&e7000pc_ops);
468	}
469	#else
470
471	void
472	_initialize_ser_e7000pc ()
473	{
474
475	}
4ce7ba51	476	#endif