/*
 *  Copyright (C) 2002-2007  The DOSBox Team
 *
 *  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.
 */

/* $Id: dos_misc.cpp,v 1.17 2007/01/08 19:45:39 qbix79 Exp $ */

#include "dosbox.h"
#include "callback.h"
#include "mem.h"
#include "regs.h"
#include "dos_inc.h"
#include <list>


static Bitu call_int2f,call_int2a;

static std::list<MultiplexHandler*> Multiplex;
typedef std::list<MultiplexHandler*>::iterator Multiplex_it;

void DOS_AddMultiplexHandler(MultiplexHandler * handler) {
	Multiplex.push_front(handler);
}

void DOS_DelMultiplexHandler(MultiplexHandler * handler) {
	for(Multiplex_it it =Multiplex.begin();it != Multiplex.end();it++) {
		if(*it == handler) {
			Multiplex.erase(it);
			return;
		}
	}
}

static Bitu INT2F_Handler(void) {
	for(Multiplex_it it = Multiplex.begin();it != Multiplex.end();it++)
		if( (*it)() ) return CBRET_NONE;
   
	LOG(LOG_DOSMISC,LOG_ERROR)("DOS:Multiplex Unhandled call %4X",reg_ax);
	return CBRET_NONE;
};


static Bitu INT2A_Handler(void) {

	return CBRET_NONE;
};

static bool DOS_MultiplexFunctions(void) {
	switch (reg_ax) {
	case 0x1216:	/* GET ADDRESS OF SYSTEM FILE TABLE ENTRY */
		/* Should do a lot more. Let's see if we can get away with it */
		LOG(LOG_DOSMISC,LOG_ERROR)("Some BAD filetable call used bx=%X",reg_bx);
		if(reg_bx <= DOS_FILES) CALLBACK_SCF(false);
		else CALLBACK_SCF(true);
		return true;
	case 0x1607:
		if (reg_bx == 0x15) {
			switch (reg_cx) {
				case 0x0000:		// query instance
					reg_cx = 0x0001;
					reg_dx = 0x50;		// dos driver segment
					SegSet16(es,0x50);	// patch table seg
					reg_bx = 0x60;		// patch table ofs
					return true;
				case 0x0001:		// set patches
					reg_ax = 0xb97c;
					reg_bx = (reg_dx & 0x16);
					reg_dx = 0xa2ab;
					return true;
				case 0x0003:		// get size of data struc
					if (reg_dx==0x0001) {
						// CDS size requested
						reg_ax = 0xb97c;
						reg_dx = 0xa2ab;
						reg_cx = 0x000e;	// size
					}
					return true;
				case 0x0004:		// instanced data
					reg_dx = 0;		// none
					return true;
				case 0x0005:		// get device driver size
					reg_ax = 0;
					reg_dx = 0;
					return true;
				default:
					return false;
			}
		}
		else if (reg_bx == 0x18) return true;	// idle callout
		else return false;
	case 0x1680:	/*  RELEASE CURRENT VIRTUAL MACHINE TIME-SLICE */
		//TODO Maybe do some idling but could screw up other systems :)
		reg_al=0;	
		return true;
	case 0x1689:	/*  Kernel IDLE CALL */
	case 0x168f:	/*  Close awareness crap */
	   /* Removing warning */
		return true;
	case 0x4a01:	/* Query free hma space */
	case 0x4a02:	/* ALLOCATE HMA SPACE */
		LOG(LOG_DOSMISC,LOG_WARN)("INT 2f:4a HMA. DOSBox reports none available.");
		reg_bx=0;	//number of bytes available in HMA or amount succesfully allocated
		//ESDI=ffff:ffff Location of HMA/Allocated memory
		SegSet16(es,0xffff);
		reg_di=0xffff;
		return true;
	}

	return false;
}

void DOS_SetupMisc(void) {
	/* Setup the dos multiplex interrupt */
	call_int2f=CALLBACK_Allocate();
	CALLBACK_Setup(call_int2f,&INT2F_Handler,CB_IRET,"DOS Int 2f");
	RealSetVec(0x2f,CALLBACK_RealPointer(call_int2f));
	DOS_AddMultiplexHandler(DOS_MultiplexFunctions);
	/* Setup the dos network interrupt */
	call_int2a=CALLBACK_Allocate();
	CALLBACK_Setup(call_int2a,&INT2A_Handler,CB_IRET,"DOS Int 2a");
	RealSetVec(0x2A,CALLBACK_RealPointer(call_int2a));
};