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/*
* Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
*
* (c) Copyright 1996 - 2001 Gary Henderson (gary.henderson@ntlworld.com) and
* Jerremy Koot (jkoot@snes9x.com)
*
* Super FX C emulator code
* (c) Copyright 1997 - 1999 Ivar (ivar@snes9x.com) and
* Gary Henderson.
* Super FX assembler emulator code (c) Copyright 1998 zsKnight and _Demo_.
*
* DSP1 emulator code (c) Copyright 1998 Ivar, _Demo_ and Gary Henderson.
* C4 asm and some C emulation code (c) Copyright 2000 zsKnight and _Demo_.
* C4 C code (c) Copyright 2001 Gary Henderson (gary.henderson@ntlworld.com).
*
* DOS port code contains the works of other authors. See headers in
* individual files.
*
* Snes9x homepage: http://www.snes9x.com
*
* Permission to use, copy, modify and distribute Snes9x in both binary and
* source form, for non-commercial purposes, is hereby granted without fee,
* providing that this license information and copyright notice appear with
* all copies and any derived work.
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event shall the authors be held liable for any damages
* arising from the use of this software.
*
* Snes9x is freeware for PERSONAL USE only. Commercial users should
* seek permission of the copyright holders first. Commercial use includes
* charging money for Snes9x or software derived from Snes9x.
*
* The copyright holders request that bug fixes and improvements to the code
* should be forwarded to them so everyone can benefit from the modifications
* in future versions.
*
* Super NES and Super Nintendo Entertainment System are trademarks of
* Nintendo Co., Limited and its subsidiary companies.
*/
/************************************************************************\
** **
** GrIP Prototype API Interface Library **
** for **
** DJGPP **
** **
** Revision 1.00 **
** **
** COPYRIGHT: **
** **
** (C) Copyright Advanced Gravis Computer Technology Ltd 1995. **
** All Rights Reserved. **
** **
** DISCLAIMER OF WARRANTIES: **
** **
** The following [enclosed] code is provided to you "AS IS", **
** without warranty of any kind. You have a royalty-free right to **
** use, modify, reproduce and distribute the following code (and/or **
** any modified version) provided that you agree that Advanced **
** Gravis has no warranty obligations and shall not be liable for **
** any damages arising out of your use of this code, even if they **
** have been advised of the possibility of such damages. This **
** Copyright statement and Disclaimer of Warranties may not be **
** removed. **
** **
** HISTORY: **
** **
** 0.102 Jul 12 95 David Bollo Initial public release on **
** GrIP hardware **
** 0.200 Aug 10 95 David Bollo Added Gravis Loadable Library **
** support **
** 0.201 Aug 11 95 David Bollo Removed Borland C++ support **
** for maintenance reasons **
** 1.00 Nov 1 95 David Bollo First official release as **
** part of GrIP SDK **
** **
\************************************************************************/
#include <stdlib.h>
#include <go32.h>
#include <dpmi.h>
#include <sys/movedata.h>
#include <sys/farptr.h>
#include "grip.h"
/* Standard String Constants for Loadable Library */
char GrLibName[] = "GRIP.GLL";
char GrLibEnv[] = "GRIP";
char GrLibDir[] = "C:\\GRIP\\";
/* Global Thunking Data */
GRIP_THUNK GRIP_Thunk;
static int GRIP_Thunked = 0;
static unsigned int GRIP_CS;
static unsigned int GRIP_DS;
#if defined(GRIP_DEBUG)
static unsigned short GRIP_ES;
#endif
#ifdef __cplusplus
extern "C"
{
#endif
#define DPMI_AllocDOS(a, b) (__dpmi_allocate_dos_memory(a, (int *) b) << 4)
#define DPMI_FreeDOS(a) __dpmi_free_dos_memory(a)
#define DPMI_AllocSel() __dpmi_allocate_ldt_descriptors(1)
#define DPMI_FreeSel(a) __dpmi_free_ldt_descriptor(a)
unsigned char DPMI_SetCodeAR(unsigned short sel);
unsigned char DPMI_SetDataAR(unsigned short sel);
unsigned char DPMI_SetBounds(unsigned short sel, unsigned long base, unsigned short lm) {
if (__dpmi_set_segment_base_address(sel, base) == -1) return -1;
if (__dpmi_set_segment_limit(sel, lm - 1) == -1) return -1;
return 0;
}
GRIP_bool8 GrLink(GRIP_BUF image, GRIP_VALUE size)
{
unsigned short img_off; /* Offset of binary image */
unsigned short img_size; /* Size of binary image */
unsigned char img_check; /* Checksum of binary image */
unsigned long memory; /* Image memory */
GRIP_BUF_C header; /* Image header */
GRIP_BUF_C core; /* Image core */
int i;
/* Check for duplicate GrLink calls */
if (GRIP_Thunked) return 0;
/* Sanity check the inputs */
if (image == 0 || size < 16) return 0;
/* Check the image header for the proper signature bytes */
header = (GRIP_BUF_C) image;
if (header[0] != 'D' || header[1] != 'B') return 0;
/* Extract the image offsets from the header */
img_off = ( (header[2] & 0x0F) << 12 ) |
( (header[3] & 0x0F) << 8 ) |
( (header[4] & 0x0F) << 4 ) |
( (header[5] & 0x0F) );
img_size = ( (header[6] & 0x0F) << 12 ) |
( (header[7] & 0x0F) << 8 ) |
( (header[8] & 0x0F) << 4 ) |
( (header[9] & 0x0F) );
img_check = ( (header[10] & 0x0F) << 4 ) |
( (header[11] & 0x0F) );
/* Compute the start of image core */
if ( size < ((img_off + img_size) << 4) ) return 0;
core = header + (img_off << 4);
/* Verify the checksum */
for (i = 0; i < (img_size << 4); i++) img_check ^= core[i];
if (img_check != 0) return 0;
/* Allocate memory for the core */
memory = (unsigned long) DPMI_AllocDOS(img_size, &GRIP_DS);
if (!memory) return 0;
/* Copy the image */
_dosmemputl(core, img_size << 2, memory);
/* Allocate a code selector for the core */
GRIP_CS = DPMI_AllocSel();
if (GRIP_CS == 0) {
DPMI_FreeDOS(GRIP_DS);
return 0;
}
if (DPMI_SetBounds(GRIP_CS, memory, img_size << 4) != 0) {
DPMI_FreeSel(GRIP_CS);
DPMI_FreeDOS(GRIP_DS);
return 0;
}
if (DPMI_SetCodeAR(GRIP_CS) != 0) {
DPMI_FreeSel(GRIP_CS);
DPMI_FreeDOS(GRIP_DS);
return 0;
}
/* Prepare the thunking layer */
for (i = 0; i < sizeof(GRIP_THUNK); i++)
GRIP_Thunk[i] = ((GRIP_BUF_C)core)[i];
*(GRIP_BUF_S)(GRIP_Thunk+0x02) = 0;
*(GRIP_BUF_S)(GRIP_Thunk+0x06) = GRIP_CS;
*(GRIP_BUF_S)(GRIP_Thunk+0x0C) = GRIP_CS;
/* Allocate a debugging selector if GRIP_DEBUG is defined */
#if defined(GRIP_DEBUG)
/* I don't know what this does... at least it compiles okay */
GRIP_ES = DPMI_AllocSel();
if (GRIP_ES == 0) {
DPMI_FreeSel(GRIP_CS);
DPMI_FreeDOS(GRIP_DS);
return 0;
}
if (DPMI_SetBounds(GRIP_ES, 0xB0000, 80*25*2) != 0)
{
DPMI_FreeSel(GRIP_ES);
DPMI_FreeSel(GRIP_CS);
DPMI_FreeDOS(GRIP_DS);
return 0;
}
if (DPMI_SetDataAR(GRIP_ES) != 0)
{
DPMI_FreeSel(GRIP_ES);
DPMI_FreeSel(GRIP_CS);
DPMI_FreeDOS(GRIP_DS);
return 0;
}
_farpokew(_dos_ds, memory + 0x12, 0xB000);
_farpokew(_dos_ds, memory + 0x16, GRIP_ES);
#else
_farpokew(_dos_ds, memory + 0x12, 0);
_farpokew(_dos_ds, memory + 0x16, 0);
#endif
// Save the data selector
_farpokew(_dos_ds, memory + 0x10, 0);
_farpokew(_dos_ds, memory + 0x14, GRIP_DS);
/* Complete the link */
if (Gr__Link() == 0)
{
#if defined(GRIP_DEBUG)
DPMI_FreeSel(GRIP_ES);
#endif
DPMI_FreeSel(GRIP_CS);
DPMI_FreeDOS(GRIP_DS);
return 0;
}
GRIP_Thunked = 1;
return 1;
}
GRIP_bool8 GrUnlink(void)
{
// Check that the library has been loaded
if (!GRIP_Thunked)
return 0;
// Unlink the library
Gr__Unlink();
// Free the library memory
#if defined(GRIP_DEBUG)
if (DPMI_FreeSel(GRIP_ES) != 0)
return 0;
#endif
if (DPMI_FreeSel(GRIP_CS) != 0)
return 0;
if (DPMI_FreeDOS(GRIP_DS) != 0)
return 0;
GRIP_Thunked = 0;
return 1;
}
#ifdef __cplusplus
}
#endif
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