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/* dve.c -- I/O code for the Densan DVE-R3900 board.

 *

 * Copyright (c) 1998 Cygnus Support

 *

 * The authors hereby grant permission to use, copy, modify, distribute,

 * and license this software and its documentation for any purpose, provided

 * that existing copyright notices are retained in all copies and that this

 * notice is included verbatim in any distributions. No written agreement,

 * license, or royalty fee is required for any of the authorized uses.

 * Modifications to this software may be copyrighted by their authors

 * and need not follow the licensing terms described here, provided that

 * the new terms are clearly indicated on the first page of each file where

 * they apply.

 */

/* Flag indicating that we are being debugged by GDB.  If set,

   preceded each character output to the console with a ^O,

   so that GDB will print it instead of discarding it.  */

int output_debug = 1;

/* Monitor "ci" function (console input) */

typedef int (*cifunc)(int waitflag);

static cifunc ci = (cifunc) 0xbfc00010;

#define WAIT    1

#define NOWAIT  0 

#define NOCHAR  (-1)

/* Monitor "co" function (console output) */

typedef void (*cofunc)(int c);

static cofunc co = (cofunc) 0xbfc00018;

/*  outbyte -- shove a byte out the serial port; used by write.c.  */

int

outbyte(byte)

     unsigned char byte;

{

  /* Output a ^O prefix so that GDB won't discard the output.  */

  if (output_debug)

    co (0x0f);

  co (byte);

  return byte;

}

/* inbyte -- get a byte from the serial port; used by read.c.  */

unsigned char

inbyte()

{

  return (unsigned char) ci (WAIT);

}

/* Structure filled in by get_mem_info.  Only the size field is

   actually used (by sbrk), so the others aren't even filled in.  */

struct s_mem

{

  unsigned int size;

  unsigned int icsize;

  unsigned int dcsize;

};

void

get_mem_info (mem)

     struct s_mem *mem;

{

  mem->size = 0x1000000;        /* DVE-R3900 board has 16 MB of RAM */

}

/* close function is a dummy for this target.  */

int close (fd)

     int fd;

{

  return 0;

}