/* -*-C-*-

$Id: ntscmlib.h,v 1.9 1999/01/02 06:11:34 cph Exp $

Copyright (c) 1993-1999 Massachusetts Institute of Technology

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.
*/

/* MIT Scheme under Windows system-dependent utilities. */

#ifndef SCM_NTLIB_H

#include <windows.h>

/* Timer installation status codes. */

#define WIN32_ASYNC_TIMER_OK		0
#define WIN32_ASYNC_TIMER_NONE		1
#define WIN32_ASYNC_TIMER_EXHAUSTED	2
#define WIN32_ASYNC_TIMER_RESOLUTION	3
#define WIN32_ASYNC_TIMER_NOLOCK	4
#define WIN32_ASYNC_TIMER_NOMEM		5
#define WIN32_ASYNC_TIMER_NOLDT		6

#ifndef W32SUT_16

/* Exports to Scheme */

typedef struct {

  BOOL (__cdecl *under_win32s_p) ();

  char *
    (__cdecl *allocate_heap) (unsigned long,		/* size */
			      unsigned long *);		/* handle */
  void
    (__cdecl *release_heap) (char *,			/* base */
		     unsigned long);			/* handle */

  BOOL
    (__cdecl *lock_memory_area) (void *,		/* area */
				 unsigned long);	/* size */
  void
    (__cdecl *unlock_memory_area) (void *,		/* area */
				   unsigned long);	/* size */

  UINT
    (__cdecl *install_async_timer)
      (void **,			/* timer state */
       unsigned long *,		/* regs */
       long,			/* memtop_off */
       long,			/* int_code_off */
       long,			/* int_mask_off */
       unsigned long,		/* mask */
       long,			/* ctr_off */
       unsigned long,		/* catatonia_message */
       unsigned long,		/* interrupt_message */
       HWND,			/* window */
       void (*) (void),		/* procedure to grab int regs */
       void (*) (void)		/* procedure to release int regs */
       );

  void
    (__cdecl *flush_async_timer) (void *);

  BOOL
    (__cdecl *alloc_scheme_selectors) (unsigned long,		/* base */
				       unsigned long,		/* limit */
				       unsigned short *,	/* cs */
				       unsigned short *,	/* ds */
				       unsigned short *);	/* ss */
  
  void
    (__cdecl *release_scheme_selectors) (unsigned short,	/* cs */
					 unsigned short,	/* ds */
					 unsigned short);	/* ss */

} WIN32_SYSTEM_UTILITIES;

extern WIN32_SYSTEM_UTILITIES win32_system_utilities;
#endif /* not W32SUT_16 */

#if defined(W32SUT_32) || defined(W32SUT_16)

/* Under Win3.1, there is a 16-bit "universal thunk".
   The following define the communications protocol.
 */

#include <stdarg.h>
#include <w32sut.h>

#ifdef W32SUT_16
  typedef unsigned long FAR * SCM_ULPTR;
#else
  typedef unsigned long * SCM_ULPTR;
#endif

typedef LPVOID SCM_VDPTR;
typedef long SCM_LONG;
typedef unsigned long SCM_ULONG;
typedef unsigned short SCM_BOOL;
typedef unsigned short SCM_SEL;

#define STRINGIFY(arg) #arg

#define NTW16LIB_DLL_NAME	"scheme16.dll"
#define NTW16LIB_DLL_INIT	ntw16lib_init
#define NTW16LIB_DLL_ENTRY	ntw16lib_handler

#define NTW32LIB_RESERVED		0

#define NTW32LIB_VIRTUAL_LOCK		1
struct ntw32lib_vlock_s
{
  SCM_VDPTR area;		/* ->16 */
  SCM_ULONG size;		/* ->16 */
};

#define NTW32LIB_VIRTUAL_UNLOCK		2
struct ntw32lib_vulock_s
{
  SCM_VDPTR area;		/* ->16 */
  SCM_ULONG size;		/* ->16 */
};

#define NTW32LIB_INSTALL_TIMER		3
struct ntw32lib_itimer_s
{
  SCM_ULONG handle;		/* ->32 */
  SCM_ULPTR base;		/* ->16 */
  SCM_LONG memtop_off;		/* ->16 */
  SCM_LONG int_code_off;	/* ->16 */
  SCM_LONG int_mask_off;	/* ->16 */
  SCM_ULONG bit_mask;		/* ->16 */
  SCM_LONG ctr_off;		/* ->16 */
  SCM_ULONG catatonia_message;	/* ->16 */
  SCM_ULONG interrupt_message;	/* ->16 */
  SCM_ULONG window;		/* ->16 */
};

#define NTW32LIB_FLUSH_TIMER		4
struct ntw32lib_ftimer_s
{
  SCM_ULONG handle;		/* ->16 */
};

#define NTW32LIB_ALLOC_SELECTORS	5
struct ntw32lib_selalloc_s
{
  SCM_ULONG base;		/* ->16 */
  SCM_ULONG limit;		/* ->16 */
  SCM_SEL cs32;			/* ->16 */
  SCM_SEL ds32;			/* ->16 */
  SCM_SEL cs;			/* ->32 */
  SCM_SEL ds;			/* ->32 */
  SCM_SEL ss;			/* ->32 */
};

#define NTW32LIB_FREE_SELECTORS		6
struct ntw32lib_selfree_s
{
  SCM_SEL cs32;			/* ->16 */
  SCM_SEL ds32;			/* ->16 */
  SCM_SEL cs;			/* ->16 */
  SCM_SEL ds;			/* ->16 */
  SCM_SEL ss;			/* ->16 */
};

#endif /* defined(W32SUT_32) || defined(W32SUT_16) */

#endif /* SCM_NTLIB_H */