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/*

 * io.c -- all the code to make GCC and the libraries run on

 *         a bare target board.

 */

#include <sys/types.h>

#include <sys/stat.h>

#include <errno.h>

#include "hppa-defs.h"

extern char *_end;                /* _end is set in the linker command file */

/* just in case, most boards have at least some memory */

#ifndef RAMSIZE

#  define RAMSIZE             (char *)0x100000

#endif

int

print(ptr)

char *ptr;

{

  while (*ptr)

    outbyte (*ptr++);

}

int

putnum (Num)

unsigned int Num;

{

  char  Buffer[9];

  int   Count;

  char  *BufPtr = Buffer;

  int   Digit;

  for (Count = 7 ; Count >= 0 ; Count--) {

    Digit = (Num >> (Count * 4)) & 0xf;

    if (Digit <= 9)

      *BufPtr++ = (char) ('0' + Digit);

    else

      *BufPtr++ = (char) ('a' - 10 + Digit);

  }

  *BufPtr = (char) 0;

  print (Buffer);

  return;

}

int

delay (x)

     int x;

{

  int  y = 17;

  while (x-- !=0)

    y = y^2;

}

/*

 * strobe -- do a zylons thing, toggling each led in sequence forever...

 */

int

zylons()

{

  while (1) {

    strobe();

  }

}

/*

 * strobe -- toggle each led in sequence up and back once.

 */

int

strobe()

{

  static unsigned char curled = 1;

  static unsigned char dir = 0;

  curled = 1;

  dir = 0;

  while (curled != 0) {

    led_putnum (curled);

    delay (70000);

    if (dir)

      curled >>= 1;

    else

      curled <<= 1;

    if (curled == 128) {

      dir = ~dir;

    }

  }

  curled = 1;

  dir = 0;

}

/*

 * iodc_io_call -- this makes a call into the IODC routine

 */

int

iodc_io_call(ep_address,arg0,arg1,arg2,arg3,arg4,arg5,arg6,arg7,arg8,arg9,arg10,arg11)

int ep_address, arg0, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9, arg10, arg11;

{

  int         (*iodc_entry_point)();

  iodc_entry_point = (int (*)())ep_address;

  return ((*iodc_entry_point)(arg0,arg1,arg2,arg3,arg4,arg5,arg6,arg7,arg8,arg9,arg10,arg11));

}

/*

 * pdc_call -- this makes a call into the PDC routine

 */

int

pdc_call(arg0,arg1,arg2,arg3,arg4,arg5,arg6,arg7,arg8,arg9,arg10,arg11)

     int arg0, arg1, arg2, arg3,  arg4, arg5;

     int arg6, arg7, arg9, arg10, arg11;

{

   return ( CALL_PDC(arg0,arg1,arg2,arg3,arg4,arg5,arg6,arg7,arg8,arg9,arg10,arg11));

}

/*

 * put_led -- put a bit pattern on the LED's.

 */

int

led_putnum (byte)

     unsigned short byte;

{

  return (pdc_call(OPT_PDC_CHASSIS,0,byte));

}

/*

 * outbyte -- shove a byte out the serial port

 */

int

outbyte(byte)

     unsigned char byte;

{

  int status;

  int R_addr[32];

  struct _dev *console = (struct _dev *)PGZ_CONSOLE_STRUCT;

  status = iodc_io_call(console->iodc_io, console->hpa, IO_CONSOLE_OUTPUT, console->spa,

                        console->layer[0], R_addr, 0, &byte, 1,   0);

  switch(status)

    {

    case 0:  return(1);

    default: return (-1);

    }

}

/*

 * inbyte -- get a byte from the serial port

 */

unsigned char

inbyte()

{

  int status;

  int R_addr[32];

  char inbuf;

  struct _dev *console = (struct _dev *)PGZ_CONSOLE_STRUCT;

  while (status == 0) {

    status = iodc_io_call(console->iodc_io, console->hpa, IO_CONSOLE_INPUT, console->spa,

                          console->layer[0], R_addr, 0, &inbuf, 1, 0);

    switch (status) {

    case 0:

    case 2:                                     /* recoverable error */

      if (R_addr[0] != 0) {                       /* found a character */

        return(inbuf);

      }

      else

        break;                                  /* error, no character */

    default:                                    /* error, no character */

      return(0);

    }

  }

}

/*

 * read  -- read bytes from the serial port. Ignore fd, since

 *          we only have stdin.

 */

int

read(fd, buf, nbytes)

     int fd;

     char *buf;

     int nbytes;

{

  int i = 0;

  for (i = 0; i < nbytes; i++) {

    *(buf + i) = inbyte();

    if ((*(buf + i) == '\n') || (*(buf + i) == '\r')) {

      (*(buf + i)) = 0;

      break;

    }

  }

  return (i);

}

/*

 * write -- write bytes to the serial port. Ignore fd, since

 *          stdout and stderr are the same. Since we have no filesystem,

 *          open will only return an error.

 */

int

write(fd, buf, nbytes)

     int fd;

     char *buf;

     int nbytes;

{

  int i;

  for (i = 0; i < nbytes; i++) {

    if (*(buf + i) == '\n') {

      outbyte ('\r');

    }

    outbyte (*(buf + i));

  }

  return (nbytes);

}

/*

 * open -- open a file descriptor. We don't have a filesystem, so

 *         we return an error.

 */

int

open(buf, flags, mode)

     char *buf;

     int flags;

     int mode;

{

  errno = EIO;

  return (-1);

}

/*

 * close -- close a file descriptor. We don't need

 *          to do anything, but pretend we did.

 */

int

close(fd)

     int fd;

{

  return (0);

}

/*

 * sbrk -- changes heap size size. Get nbytes more

 *         RAM. We just increment a pointer in what's

 *         left of memory on the board.

 */

char *

sbrk(nbytes)

     int nbytes;

{

  static char * heap_ptr = NULL;

  char *        base;

  if (heap_ptr == NULL) {

    heap_ptr = (char *)&_end;

  }

  if ((RAMSIZE - heap_ptr) >= 0) {

    base = heap_ptr;

    heap_ptr += nbytes;

    return (heap_ptr);

  } else {

    errno = ENOMEM;

    return ((char *)-1);

  }

}

/*

 * isatty -- returns 1 if connected to a terminal device,

 *           returns 0 if not. Since we're hooked up to a

 *           serial port, we'll say yes return a 1.

 */

int

isatty(fd)

     int fd;

{

  return (1);

}

/*

 * lseek -- move read/write pointer. Since a serial port

 *          is non-seekable, we return an error.

 */

off_t

lseek(fd,  offset, whence)

     int fd;

     off_t offset;

     int whence;

{

  errno = ESPIPE;

  return ((off_t)-1);

}

/*

 * fstat -- get status of a file. Since we have no file

 *          system, we just return an error.

 */

int

fstat(fd, buf)

     int fd;

     struct stat *buf;

{

  errno = EIO;

  return (-1);

}

/*

 * getpid -- only one process, so just return 1.

 */

#define __MYPID 1

int

getpid()

{

  return __MYPID;

}

/*

 * kill -- assume mvme.S, and go out via exit...

 */

int

kill(pid, sig)

     int pid;

     int sig;

{

  if(pid == __MYPID)

    _exit(sig);

  return 0;

}