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/* Stand-alone library for M32R-EVA board.
 *
 * Copyright (c) 1996 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.
 */
 
/* Serial I/O routines for M32R-EVA board */
 
#define UART_INCHAR_ADDR	0xff102013
#define UART_OUTCHR_ADDR	0xff10200f
#define UART_STATUS_ADDR	0xff102006
#define UART_INPUT_EMPTY	0x4
#define UART_OUTPUT_EMPTY	0x1
 
static volatile char  *rx_port   = (char *)  UART_INCHAR_ADDR;
static volatile char  *tx_port   = (char *)  UART_OUTCHR_ADDR;
static volatile short *rx_status = (short *) UART_STATUS_ADDR;
static volatile short *tx_status = (short *) UART_STATUS_ADDR;
 
static int
rx_rdy()
{
  return !(*rx_status & UART_INPUT_EMPTY);
}
 
static int
tx_rdy()
{
  return (*tx_status & UART_OUTPUT_EMPTY);
}
 
static unsigned char
rx_char()
{
  return *rx_port;
}
 
void
tx_char(char c)
{
  *tx_port = c;
}
 
int
getDebugChar()
{
  while (!rx_rdy())
    ;
  return rx_char();
}
 
void
putDebugChar(int c)
{
  while (!tx_rdy())
    ;
  tx_char(c);
}
 
void mesg(char *p)
{
  while (*p)
    {
      if (*p == '\n')
	putDebugChar('\r');
      putDebugChar(*p++);
    }
}
 
void phex(long x)
{
  char buf[9];
  int i;
 
  buf[8] = '\0';
  for (i = 7; i >= 0; i--)
    {
      char c = x & 0x0f;
      buf[i] = c < 10 ? c + '0' : c - 10 + 'A';
      x >>= 4;
    }
  mesg(buf);
}
 
/* Setup trap TT to go to ROUTINE. */
 
void
exceptionHandler (int tt, unsigned long routine)
{
  unsigned long *tb = 0;	/* Trap vector base address */
 
  tb[tt] = ((routine >> 2) | 0xff000000) - tt;
}
 
/* Return the address of trap TT handler */
 
unsigned long
getExceptionHandler (int tt)
{
  unsigned long *tb = 0;	/* Trap vector base address */
 
  return ((tb[tt] + tt) | 0xff000000) << 2;
}