#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "registers.h"
#include "wine.h"
#include "msdos.h"
#include "miscemu.h"
#include "module.h"
#include "options.h"
#include "stddebug.h"
/* #define DEBUG_INT */
#include "debug.h"

  /* base WINPROC module number for VxDs */
#define VXD_BASE 400

static void do_int2f_16(struct sigcontext_struct *context);

/**********************************************************************
 *	    INT_Int2fHandler
 *
 * Handler for int 2fh (multiplex).
 */
void INT_Int2fHandler( struct sigcontext_struct context )
{
    switch(AH_reg(&context))
    {
    case 0x10:
        AL_reg(&context) = 0xff; /* share is installed */
        break;

    case 0x15: /* mscdex */
        /* ignore requests */
        break;

    case 0x16:
        do_int2f_16( &context );
        break;

    case 0x4a:
        switch(AL_reg(&context))
        {
        case 0x12:  /* realtime compression interface */
            break;  /* not installed */
        default:
            INT_BARF( &context, 0x2f );
        }
        break;
    default:
        INT_BARF( &context, 0x2f );
        break;
    }
}


/**********************************************************************
 *	    do_int2f_16
 */
static void do_int2f_16(struct sigcontext_struct *context)
{
    DWORD addr;

    switch(AL_reg(context))
    {
    case 0x00:  /* Windows enhanced mode installation check */
        AX_reg(context) = Options.enhanced ? WINVERSION : 0;
        break;
	
    case 0x0a:  /* Get Windows version and type */
        AX_reg(context) = 0;
        BX_reg(context) = (WINVERSION >> 8) | ((WINVERSION << 8) & 0xff00);
        CX_reg(context) = Options.enhanced ? 3 : 2;
        break;

    case 0x80:  /* Release time-slice */
	AL_reg(context) = 0;
	/* FIXME: We need to do something that lets some other process run
	   here.  */
	sleep(0);
        break;

    case 0x83:  /* Return Current Virtual Machine ID */
        /* Virtual Machines are usually created/destroyed when Windows runs
         * DOS programs. Since we never do, we are always in the System VM.
         * According to Ralf Brown's Interrupt List, never return 0. But it
         * seems to work okay (returning 0), just to be sure we return 1.
         */
	BX_reg(context) = 1; /* VM 1 is probably the System VM */
	break;

    case 0x84:  /* Get device API entry point */
        addr = MODULE_GetEntryPoint( GetModuleHandle("WINPROCS"),
                                     VXD_BASE + BX_reg(context) );
        if (!addr)  /* not supported */
        {
	    fprintf( stderr,"Application attempted to access VxD %04x\n",
                     BX_reg(context) );
	    fprintf( stderr,"This device is not known to Wine.");
	    fprintf( stderr,"Expect a failure now\n");
        }
	ES_reg(context) = SELECTOROF(addr);
	DI_reg(context) = OFFSETOF(addr);
	break;

    case 0x86:  /* DPMI detect mode */
        AX_reg(context) = 0;  /* Running under DPMI */
        break;

    /* FIXME: is this right?  Specs say that this should only be callable
       in real (v86) mode which we never enter.  */
    case 0x87:  /* DPMI installation check */
        AX_reg(context) = 0x0000; /* DPMI Installed */
        BX_reg(context) = 0x0001; /* 32bits available */
        CL_reg(context) = runtime_cpu();
        DX_reg(context) = 0x005a; /* DPMI major/minor 0.90 */
        SI_reg(context) = 0;      /* # of para. of DOS extended private data */
        ES_reg(context) = 0;      /* ES:DI is DPMI switch entry point */
        DI_reg(context) = 0;
        break;

    case 0x8a:  /* DPMI get vendor-specific API entry point. */
	/* The 1.0 specs say this should work with all 0.9 hosts.  */
	break;

    default:
        INT_BARF( context, 0x2f );
    }
}