/* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

//#define DEBUGIFY
#include "debugify.h"

#define RMT_DBG(x) if (remote_debug) printf_unfiltered x


#if defined(__GO32__) || defined(_WIN32)
#if defined(_WIN32)
/* we define the 32-bit calls which thunk to 16-bit dll calls 
 */
#include "win-e7kpc.h"
#include "target.h"
#ifdef _MSC_VER
/* msvc uses strnicmp instead of strncasecmp */
#define strncasecmp strnicmp
#define W32SUT_32
#include "windefs.h"
#include "w32sut.h"
#endif
#include "gdbwin.h"

#else
#include <sys/dos.h>
#include "defs.h"
#endif /* _WIN32 */
#include "serial.h"


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 _WIN32
/* These routines are normally part of the go32 dos extender.
 * We redefine them here to be calls into their Windoze equivs. */
static void dosmemget(int offset, int length, void *buffer);
static void dosmemput(const void *buffer, int length, int offset);

/* dll entry points for w32se7kpc.dll; call kernel32 to thunk for us */
typedef BOOL (APIENTRY * PUTREGISTER) (
	HANDLE hModule,
        LPCSTR lpsz16BitDLL,
	LPCSTR lpszInitName,
	LPCSTR lpszProcName,
	UT32PROC * ppfn32Thunk,
	FARPROC pfnUT32Callback,
	LPVOID lpBuff
	);

/* dll entry points for w95e7kpc.dll and w31e7kpc.dll */
HANDLE hWine7kpc = 0;

typedef int (APIENTRY * PWIN_LOAD_E7KPC) (void);
typedef void (APIENTRY * PWIN_UNLOAD_E7KPC) (void);
typedef void (APIENTRY * PWIN_MEM_GET) (unsigned char *buf, int len, int offset);
typedef void (APIENTRY * PWIN_MEM_PUT) (unsigned char *buf, int len, int offset);
typedef void (APIENTRY * PWIN_REMOTE_DEBUG) (int val);

PWIN_LOAD_E7KPC pwin_load_e7kpc=NULL;
PWIN_UNLOAD_E7KPC pwin_unload_e7kpc=NULL;
PWIN_MEM_GET pwin_mem_get=NULL;
PWIN_MEM_PUT pwin_mem_put=NULL;
PWIN_REMOTE_DEBUG pwin_remote_debug=NULL;

static int last_remote_debug = 0;
static int wine7kpc_loaded = 0;
static void win_unload_e7kpc (void);

static int win_load_e7kpc (void)
{
    if (pwin_load_e7kpc && !wine7kpc_loaded)
    {
      wine7kpc_loaded = pwin_load_e7kpc();
      if (wine7kpc_loaded)
	  make_final_cleanup(win_unload_e7kpc, 0);
    }
    return wine7kpc_loaded;
}

static void win_unload_e7kpc (void)
{
    DBG(("win_unload_e7kpc\n"));
    if (pwin_unload_e7kpc && wine7kpc_loaded)
      pwin_unload_e7kpc();
    wine7kpc_loaded = 0;
}

static void win_mem_get (unsigned char *buf, int offset, int len)
{
    DBG(("win_mem_get(&buf=<x%x> offset=<x%x> len=<%d>)\n", buf, offset, len));
    if (remote_debug!=last_remote_debug && pwin_remote_debug)
    {
	//DBG(("calling pwin_remote_debug\n"));
	pwin_remote_debug(remote_debug);
        last_remote_debug=remote_debug;
    }
    if (pwin_mem_get) 
    {
	//DBG(("calling pwin_mem_get\n"));
        pwin_mem_get (buf, offset, len);
    }
    //DBG(("leaving win_mem_get; buf=<%s>\n", buf));
}

static void win_mem_put (unsigned char *buf, int offset, int len)
{
    DBG(("win_mem_put(buf=<%s> offset=<x%x> len=<%d>)\n", buf, offset, len));
    if (remote_debug!=last_remote_debug && pwin_remote_debug)
    {
	pwin_remote_debug(remote_debug);
        last_remote_debug=remote_debug;
    }
    if (pwin_mem_put)
      pwin_mem_put (buf, offset, len);
}

static void dosmemget(int offset, int length, void *buffer)
{
    win_mem_get(buffer, offset, length);
}

static void dosmemput(const void *buffer, int length, int offset)
{
    win_mem_put((unsigned char*)buffer, offset, length);
}

#endif /* _WIN32 */

#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;


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

static int
e7000pc_init ()
{
  /* Look around in memory for the board's signature */

  int try;
  
  DBG(("e7000pc_init()\n"));
  for (try = 0; sigs[try].sw; try++)

    {
      int val;
      board_at = sigs[try].addr;
      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;

      RMT_DBG(("e7000pc_init: looking for board's signature, try=%d\n", try));

      val = GET_WORD (ready);

      //DBG(("e7000pc_init: GET_WORD returns x%x\n", val));

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

	      SET_BYTE (irqtop, 1); /* Disable interrupts from e7000 */
	      SET_WORD (ready, 1);
              DBG(("Yippie!  Connected :-)\n"));
	      printf_filtered ("\nConnected to the E7000PC at address 0x%x\n", 
			       sigs[try].addr);
	      return 1;	      
	    }
          DBG(("Bummer!  e7000pc not on :-(\n"));
	  error ("The E7000 PC board is working, but the E7000 is turned off.\n");
	  return 0;
	}
    }

  DBG(("Bummer!  Can't connect :-(\n"));
  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;

static 
int 
e7000_get ()
{
  static char pbuf[1000];
  char tmp[1000];
  int x;
  DBG(("e7000_get()\n"));
  if (pbuf_index < pbuf_size) 
    {
      x = pbuf[pbuf_index++];
    }
  else if ((GET_BYTE (fb)  & 1))
    {
      int i;
      pbuf_size = GET_WORD(cdp + 2);

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

      /* Tell the E7000 we've eaten */
      SET_BYTE(fb,0);	
      /* Swap it around */
/* FIXME!  We get in an infinite loop inside e7000_open...
 * This is called from dosasync_readchar
 * called from remote-e7000.c trying to sync up.
 */
      for (i = 0; i < pbuf_size; i++) 
	{
	  pbuf[i] = tmp[i^1];
	}
      pbuf_index = 0;
      x =  pbuf[pbuf_index++];
    }
  else 
    { 
      x = -1;
    }
  return x;
}

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

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

  DBG(("dosasync_read(fd=x%x,buf,len=x%x,timeout=x%x)\n",fd,len,timeout));
  /* Then look for some more if we're still hungry */
  time (&now);
  then = now + timeout;
  while (i < len)
    {
      int ch = e7000_get();
      //DBG(("%d: e7000_get gotta x%x\n", i, ch\n"));
      
      /* While there's room in the buffer, and we've already
       * read the stuff in, suck it over */
      if (ch != -1) 
	{
	  buf[i++] = ch;
	  //DBG(("e7000_get got x%x; before loop2: len=x%x, pbuf_index=x%x, pbuf_size=x%x\n", ch, len, pbuf_index, pbuf_size));
	  while (i < len && pbuf_index < pbuf_size )
	    {
	      ch = e7000_get();
	      if (ch == -1)
		break;
	      buf[i++] = ch;
	    }
	}

      time (&now);

      if (timeout == 0 || (now >= then && timeout > 0))
	{
/* We timeout here but return i anyway...  
 * were we supposed to send a TIMEOUT ?
 * While syncing, len = 1 and timeout=1..
 * so always take this path and return 1 char. 
 */
	  DBG(("timeout; read x%x chars\n", i));
	  return i;
	}
    }
  //DBG(("Yay! read x%x chars\n", len));
  return len;
}


static int
dosasync_write (fd, buf, len)
     int fd;
     const char *buf;
     int len;
{
  int i;
  char dummy[1000];  

  DBG(("dosasync_write(fd=x%x,buf=x%x,len=x%x)\n",fd,buf,len));
  
  /* 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_BYTE(fa) & 1) != 0)
    ;

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

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

  return len;
}


#ifdef _WIN32
static int 
load_wine7kpc(void)
{
  char dll[64];

  DBG(("load_wine7kpc()\n"));
  if (win_host()==winnt)
    {
        printf_filtered( "e7000pc not supported on this host.\n" );
        return 0;
    }
  if (win_host()==win32s)
      strcpy(dll, "w31e7kpc.Dll");
  else if (win_host()==win95)
      strcpy(dll, "w95e7kpc.Dll");
  else return 0;

  /* load dll for windows support of e7000pc */
  DBG(("LoadLibrary(%s)\n",dll));
  hWine7kpc = LoadLibrary (dll);
  if (!hWine7kpc)
    {
        DBG(("LoadLibrary(%s) failed\n",dll));
        printf_filtered( "Error: unable to load %s.\n",dll);
        return 0;
    }
  pwin_load_e7kpc = (PWIN_LOAD_E7KPC) GetProcAddress (hWine7kpc, "win_load_e7kpc");
  if (!pwin_load_e7kpc)
    {
        DBG(("!pwin_load_e7kpc\n"));
        printf_filtered( "Error: unable to resolve win_load_e7kpc.\n" );
        return 0;
    }
  pwin_unload_e7kpc = (PWIN_UNLOAD_E7KPC) GetProcAddress (hWine7kpc, "win_unload_e7kpc");
  if (!pwin_unload_e7kpc)
    {
        DBG(("!pwin_unload_e7kpc\n"));
        printf_filtered( "Error: unable to resolve win_unload_e7kpc.\n" );
        return 0;
    }
  pwin_mem_get = (PWIN_MEM_GET) GetProcAddress (hWine7kpc, "win_mem_get");
  if (!pwin_mem_get)
    {
        DBG(("!pwin_mem_get\n"));
        printf_filtered( "Error: unable to resolve win_mem_get.\n" );
        return 0;
    }
  pwin_mem_put= (PWIN_MEM_PUT) GetProcAddress (hWine7kpc, "win_mem_put");
  if (!pwin_mem_put)
    {
        DBG(("!pwin_mem_put\n"));
        printf_filtered( "Error: unable to resolve win_mem_put.\n" );
        return 0;
    }
  pwin_remote_debug= (PWIN_REMOTE_DEBUG) GetProcAddress (hWine7kpc, "win_remote_debug");
  if (!pwin_remote_debug)
    {
        DBG(("!pwin_remote_debug\n"));
        printf_filtered( "Error: unable to resolve win_remote_debug.\n" );
        return 0;
    }
  DBG(("load_wine7kpc Done! :-)\n"));
  return 1;
}
#endif /* _WIN32 */

static int
e7000pc_open (scb, name)
     serial_t scb;
     const char *name;
{
  DBG(("e7000pc_open\n"));
  if (strncasecmp (name, "pc", 2) != 0)
    {
      errno = ENOENT;
      return -1;
    }
#ifdef _WIN32
  if (!load_wine7kpc()) /* load windows dll for e7kpc support */
    {
        DBG(("Error! load_wine7kpc failed\n"));
        printf_filtered("Failed to initialize dll for e7000pc support.\n" );
        return -1;
    }
  //DBG(("calling win_load_e7kpc\n"));
  if (win_load_e7kpc () != 0)
    {
      errno = ENOENT;
      return -1;
    }
#endif /* _WIN32 */
  //DBG(("calling e7000pc_init\n"));
  scb->fd = e7000pc_init ();

  if (!scb->fd)
  {
    DBG(("Error! !scb->fd\n"));
    return -1;
  }

  DBG(("e7000pc_open done! :-)\n"));
  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;

 DBG(("e7000pc_readchar\n"));
 top:

  /* FIXME!  How does dosasync_read ever return 0?
   * it always goes thru the loop once, so i>0
   */
  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;
  DBG(("e7000pc_get_tty_state\n"));

  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;
{
  DBG(("e7000pc_write(scb,str=%s,len=x%x)\n",str,len));
  dosasync_write (scb->fd, str, len);

  return 0;
}

static void
e7000pc_close (scb)
     serial_t scb;
{
  DBG(("e7000pc_close\n"));
#ifdef _WIN32
  win_unload_e7kpc ();
#endif
}

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 /* defined(__GO32__) || defined(_WIN32) */