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    /*
     * DPMI 0.9 emulation
     *
     * Copyright 1995 Alexandre Julliard
     */
    
    
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    #include <unistd.h>
    
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    #include <string.h>
    
    #include "windef.h"
    
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    #include "ldt.h"
    
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    #include "miscemu.h"
    
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    #include "msdos.h"
    
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    #include "task.h"
    
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    #include "toolhelp.h"
    
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    #include "selectors.h"
    
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    #include "process.h"
    
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    #include "callback.h"
    
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    DEFAULT_DEBUG_CHANNEL(int31);
    
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    #define DOS_GET_DRIVE(reg) ((reg) ? (reg) - 1 : DRIVE_GetCurrentDrive())
    
    
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    void CreateBPB(int drive, BYTE *data, BOOL16 limited);  /* defined in int21.c */
    
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    static void* lastvalloced = NULL;
    
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    /* Structure for real-mode callbacks */
    typedef struct
    {
        DWORD edi;
        DWORD esi;
        DWORD ebp;
        DWORD reserved;
        DWORD ebx;
        DWORD edx;
        DWORD ecx;
        DWORD eax;
    
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        WORD  fl;
    
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        WORD  es;
        WORD  ds;
        WORD  fs;
        WORD  gs;
        WORD  ip;
        WORD  cs;
        WORD  sp;
        WORD  ss;
    } REALMODECALL;
    
    
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    typedef struct tagRMCB {
        DWORD address;
    
        DWORD proc_ofs,proc_sel;
        DWORD regs_ofs,regs_sel;
    
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        struct tagRMCB *next;
    } RMCB;
    
    static RMCB *FirstRMCB = NULL;
    
    
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    /**********************************************************************
     *	    DPMI_xalloc
     * special virtualalloc, allocates lineary monoton growing memory.
     * (the usual VirtualAlloc does not satisfy that restriction)
     */
    static LPVOID
    DPMI_xalloc(int len) {
    	LPVOID	ret;
    	LPVOID	oldlastv = lastvalloced;
    
    	if (lastvalloced) {
    		int	xflag = 0;
    		ret = NULL;
    		while (!ret) {
    			ret=VirtualAlloc(lastvalloced,len,MEM_COMMIT|MEM_RESERVE,PAGE_EXECUTE_READWRITE);
    			if (!ret)
    
    				lastvalloced = (char *) lastvalloced + 0x10000;
    
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    			/* we failed to allocate one in the first round. 
    			 * try non-linear
    			 */
    			if (!xflag && (lastvalloced<oldlastv)) { /* wrapped */
    
    				FIXME("failed to allocate lineary growing memory (%d bytes), using non-linear growing...\n",len);
    
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    				xflag++;
    			}
    			/* if we even fail to allocate something in the next 
    			 * round, return NULL
    			 */
    			if ((xflag==1) && (lastvalloced >= oldlastv))
    				xflag++;
    			if ((xflag==2) && (lastvalloced < oldlastv)) {
    
    				FIXME("failed to allocate any memory of %d bytes!\n",len);
    
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    				return NULL;
    			}
    		}
    	} else
    		 ret=VirtualAlloc(NULL,len,MEM_COMMIT|MEM_RESERVE,PAGE_EXECUTE_READWRITE);
    	lastvalloced = (LPVOID)(((DWORD)ret+len+0xffff)&~0xffff);
    	return ret;
    }
    
    static void
    DPMI_xfree(LPVOID ptr) {
    	VirtualFree(ptr,0,MEM_RELEASE);
    }
    
    /* FIXME: perhaps we could grow this mapped area... */
    static LPVOID
    
    DPMI_xrealloc(LPVOID ptr,DWORD newsize) {
    
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    	MEMORY_BASIC_INFORMATION	mbi;
    	LPVOID				newptr;
    
    	newptr = DPMI_xalloc(newsize);
    
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    	if (ptr) {
    		if (!VirtualQuery(ptr,&mbi,sizeof(mbi))) {
    
    			FIXME("realloc of DPMI_xallocd region %p?\n",ptr);
    
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    			return NULL;
    		}
    		if (mbi.State == MEM_FREE) {
    
    			FIXME("realloc of DPMI_xallocd region %p?\n",ptr);
    
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    			return NULL;
    		}
    		/* We do not shrink allocated memory. most reallocs
    		 * only do grows anyway
    		 */
    		if (newsize<=mbi.RegionSize)
    			return ptr;
    
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    		memcpy(newptr,ptr,mbi.RegionSize);
    
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    		DPMI_xfree(ptr);
    	}
    
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    	return newptr;
    }
    
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    /**********************************************************************
     *	    INT_GetRealModeContext
     */
    
    static void INT_GetRealModeContext( REALMODECALL *call, CONTEXT86 *context )
    
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    {
    
        context->Eax    = call->eax;
        context->Ebx    = call->ebx;
        context->Ecx    = call->ecx;
        context->Edx    = call->edx;
        context->Esi    = call->esi;
        context->Edi    = call->edi;
        context->Ebp    = call->ebp;
        context->EFlags = call->fl | V86_FLAG;
        context->Eip    = call->ip;
        context->Esp    = call->sp;
        context->SegCs  = call->cs;
        context->SegDs  = call->ds;
        context->SegEs  = call->es;
        context->SegFs  = call->fs;
        context->SegGs  = call->gs;
        context->SegSs  = call->ss;
    
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    }
    
    
    /**********************************************************************
     *	    INT_SetRealModeContext
     */
    
    static void INT_SetRealModeContext( REALMODECALL *call, CONTEXT86 *context )
    
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    {
    
        call->eax = context->Eax;
        call->ebx = context->Ebx;
        call->ecx = context->Ecx;
        call->edx = context->Edx;
        call->esi = context->Esi;
        call->edi = context->Edi;
        call->ebp = context->Ebp;
        call->fl  = LOWORD(context->EFlags);
        call->ip  = LOWORD(context->Eip);
        call->sp  = LOWORD(context->Esp);
        call->cs  = context->SegCs;
        call->ds  = context->SegDs;
        call->es  = context->SegEs;
        call->fs  = context->SegFs;
        call->gs  = context->SegGs;
        call->ss  = context->SegSs;
    
    void DPMI_CallRMCB32(RMCB *rmcb, UINT16 ss, DWORD esp, UINT16*es, DWORD*edi)
    #if 0 /* original code, which early gccs puke on */
    {
        int _clobber;
        __asm__ __volatile__(
            "pushl %%ebp\n"
            "pushl %%ebx\n"
            "pushl %%es\n"
            "pushl %%ds\n"
            "pushfl\n"
            "mov %7,%%es\n"
            "mov %5,%%ds\n"
            ".byte 0x36, 0xff, 0x18\n" /* lcall *%ss:(%eax) */
            "popl %%ds\n"
            "mov %%es,%0\n"
            "popl %%es\n"
            "popl %%ebx\n"
            "popl %%ebp\n"
        : "=d" (*es), "=D" (*edi), "=S" (_clobber), "=a" (_clobber), "=c" (_clobber)
        : "0" (ss), "2" (esp),
          "4" (rmcb->regs_sel), "1" (rmcb->regs_ofs),
          "3" (&rmcb->proc_ofs) );
    }
    #else /* code generated by a gcc new enough */
    ;
    __ASM_GLOBAL_FUNC(DPMI_CallRMCB32,
        "pushl %ebp\n\t"
        "movl %esp,%ebp\n\t"
        "pushl %edi\n\t"
        "pushl %esi\n\t"
        "movl 0x8(%ebp),%eax\n\t"
        "movl 0x10(%ebp),%esi\n\t"
        "movl 0xc(%ebp),%edx\n\t"
        "movl 0x10(%eax),%ecx\n\t"
        "movl 0xc(%eax),%edi\n\t"
        "addl $0x4,%eax\n\t"
        "pushl %ebp\n\t"
        "pushl %ebx\n\t"
        "pushl %es\n\t"
        "pushl %ds\n\t"
        "pushfl\n\t"
        "mov %cx,%es\n\t"
        "mov %dx,%ds\n\t"
        ".byte 0x36, 0xff, 0x18\n\t" /* lcall *%ss:(%eax) */
        "popl %ds\n\t"
        "mov %es,%dx\n\t"
        "popl %es\n\t"
        "popl %ebx\n\t"
        "popl %ebp\n\t"
        "movl 0x14(%ebp),%eax\n\t"
        "movw %dx,(%eax)\n\t"
        "movl 0x18(%ebp),%edx\n\t"
        "movl %edi,(%edx)\n\t"
        "popl %esi\n\t"
        "popl %edi\n\t"
        "leave\n\t"
        "ret")
    #endif
    
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    /**********************************************************************
     *	    DPMI_CallRMCBProc
     *
     * This routine does the hard work of calling a callback procedure.
     */
    
    static void DPMI_CallRMCBProc( CONTEXT86 *context, RMCB *rmcb, WORD flag )
    
    {
        if (IS_SELECTOR_SYSTEM( rmcb->proc_sel )) {
            /* Wine-internal RMCB, call directly */
            ((RMCBPROC)rmcb->proc_ofs)(context);
        } else {
    #ifdef __i386__
            UINT16 ss,es;
    
    
            INT_SetRealModeContext((REALMODECALL *)PTR_SEG_OFF_TO_LIN( rmcb->regs_sel, rmcb->regs_ofs ), context);
    
            ss = SELECTOR_AllocBlock( (void *)(context->SegSs<<4), 0x10000, WINE_LDT_FLAGS_DATA );
    
    
            /* The called proc ends with an IRET, and takes these parameters:
             * DS:ESI = pointer to real-mode SS:SP
             * ES:EDI = pointer to real-mode call structure
             * It returns:
             * ES:EDI = pointer to real-mode call structure (may be a copy)
             * It is the proc's responsibility to change the return CS:IP in the
             * real-mode call structure. */
            if (flag & 1) {
                /* 32-bit DPMI client */
    
                DPMI_CallRMCB32(rmcb, ss, esp, &es, &edi);
    
            } else {
                /* 16-bit DPMI client */
    
                ctx.SegCs = rmcb->proc_sel;
                ctx.Eip   = rmcb->proc_ofs;
                ctx.SegDs = ss;
                ctx.Esi   = esp;
                ctx.SegEs = rmcb->regs_sel;
                ctx.Edi   = rmcb->regs_ofs;
    
                /* FIXME: I'm pretty sure this isn't right - should push flags first */
    
                wine_call_to_16_regs_short(&ctx, 0);
    
            INT_GetRealModeContext((REALMODECALL*)PTR_SEG_OFF_TO_LIN( es, edi ), context);
    #else
    
            ERR("RMCBs only implemented for i386\n");
    
    /**********************************************************************
     *	    DPMI_CallRMProc
     *
     * This routine does the hard work of calling a real mode procedure.
     */
    
    int DPMI_CallRMProc( CONTEXT86 *context, LPWORD stack, int args, int iret )
    
    {
        LPWORD stack16;
    
        LPVOID addr = NULL; /* avoid gcc warning */
    
        LPDOSTASK lpDosTask = MZ_Current();
    
        RMCB *CurrRMCB;
        int alloc = 0, already = 0;
    
    
        GlobalUnlock16( GetCurrentTask() );
    
    
        TRACE("EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
    
                     context->Eax, context->Ebx, context->Ecx, context->Edx );
    
        TRACE("ESI=%08lx EDI=%08lx ES=%04lx DS=%04lx CS:IP=%04lx:%04x, %d WORD arguments, %s\n",
    
                     context->Esi, context->Edi, context->SegEs, context->SegDs,
                     context->SegCs, LOWORD(context->Eip), args, iret?"IRET":"FAR" );
    
    /* there might be some code that just jumps to RMCBs or the like,
       in which case following the jumps here might get us to a shortcut */
    
        code = CTX_SEG_OFF_TO_LIN(context, context->SegCs, context->Eip);
    
        switch (*code) {
        case 0xe9: /* JMP NEAR */
    
          context->Eip += 3 + *(WORD *)(code+1);
    
          /* yeah, I know these gotos don't look good... */
          goto callrmproc_again;
        case 0xea: /* JMP FAR */
    
          context->Eip = *(WORD *)(code+1);
          context->SegCs = *(WORD *)(code+3);
    
          /* ...but since the label is there anyway... */
          goto callrmproc_again;
        case 0xeb: /* JMP SHORT */
    
          context->Eip += 2 + *(signed char *)(code+1);
    
          /* ...because of other gotos below, so... */
          goto callrmproc_again;
        }
    
    
    /* shortcut for chaining to internal interrupt handlers */
    
        if ((context->SegCs == 0xF000) && iret) {
            return INT_RealModeInterrupt( LOWORD(context->Eip)/4, context);
    
        }
    
    /* shortcut for RMCBs */
        CurrRMCB = FirstRMCB;
    
    
        while (CurrRMCB && (HIWORD(CurrRMCB->address) != context->SegCs))
    
        if (!(CurrRMCB || lpDosTask)) {
    
            FIXME("DPMI real-mode call using DOS VM task system, not fully tested!\n");
            TRACE("creating VM86 task\n");
    
            if (!(lpDosTask = MZ_AllocDPMITask() )) {
    
                ERR("could not setup VM86 task\n");
    
                alloc = 1; /* allocate default stack */
    
                stack16 = addr = DOSMEM_GetBlock( 64, (UINT16 *)&(context->SegSs) );
                context->Esp = 64-2;
    
                    ERR("could not allocate default stack\n");
    
                stack16 = CTX_SEG_OFF_TO_LIN(context, context->SegSs, context->Esp);
    
            context->Esp -= (args + (iret?1:0)) * sizeof(WORD);
    
            stack16 -= args;
            if (args) memcpy(stack16, stack, args*sizeof(WORD) );
            /* push flags if iret */
            if (iret) {
                stack16--; args++;
    
            }
            /* push return address (return to interrupt wrapper) */
    
            *(--stack16) = DOSMEM_wrap_seg;
    
    
        if (CurrRMCB) {
            /* RMCB call, invoke protected-mode handler directly */
    
            DPMI_CallRMCBProc(context, CurrRMCB, lpDosTask ? lpDosTask->dpmi_flag : 0);
    
            /* check if we returned to where we thought we would */
    
            if ((context->SegCs != DOSMEM_wrap_seg) ||
                (LOWORD(context->Eip) != 0)) {
    
                /* we need to continue at different address in real-mode space,
                   so we need to set it all up for real mode again */
                goto callrmproc_again;
            }
        } else {
    
            TRACE("returned from real-mode call\n");
    
        if (alloc) DOSMEM_FreeBlock( addr );
    
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    /**********************************************************************
    
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     */
    
    static void CallRMInt( CONTEXT86 *context )
    
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    {
    
        FARPROC16 rm_int = INT_GetRMHandler( BL_reg(context) );
    
        REALMODECALL *call = (REALMODECALL *)PTR_SEG_OFF_TO_LIN( context->SegEs,
    
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                                                              DI_reg(context) );
        INT_GetRealModeContext( call, &realmode_ctx );
    
    
        /* we need to check if a real-mode program has hooked the interrupt */
        if (HIWORD(rm_int)!=0xF000) {
            /* yup, which means we need to switch to real mode... */
    
            realmode_ctx.SegCs = HIWORD(rm_int);
            realmode_ctx.Eip   = LOWORD(rm_int);
    
            if (DPMI_CallRMProc( &realmode_ctx, NULL, 0, TRUE))
              SET_CFLAG(context);
    
            RESET_CFLAG(context);
    
            /* use the IP we have instead of BL_reg, in case some apps
               decide to move interrupts around for whatever reason... */
            if (INT_RealModeInterrupt( LOWORD(rm_int)/4, &realmode_ctx ))
    
              SET_CFLAG(context);
    
              FIXME("%02x: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
    
                    BL_reg(context), realmode_ctx.Eax, realmode_ctx.Ebx,
                    realmode_ctx.Ecx, realmode_ctx.Edx);
    
              FIXME("      ESI=%08lx EDI=%08lx DS=%04lx ES=%04lx\n",
    
                    realmode_ctx.Esi, realmode_ctx.Edi,
                    realmode_ctx.SegDs, realmode_ctx.SegEs );
    
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        }
    
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        INT_SetRealModeContext( call, &realmode_ctx );
    }
    
    
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    static void CallRMProc( CONTEXT86 *context, int iret )
    
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    {
    
        REALMODECALL *p = (REALMODECALL *)PTR_SEG_OFF_TO_LIN( context->SegEs, DI_reg(context) );
    
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        TRACE("RealModeCall: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
    
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    	p->eax, p->ebx, p->ecx, p->edx);
    
        TRACE("              ESI=%08lx EDI=%08lx ES=%04x DS=%04x CS:IP=%04x:%04x, %d WORD arguments, %s\n",
    
    	p->esi, p->edi, p->es, p->ds, p->cs, p->ip, CX_reg(context), iret?"IRET":"FAR" );
    
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        if (!(p->cs) && !(p->ip)) { /* remove this check
                                       if Int21/6501 case map function
                                       has been implemented */
    	SET_CFLAG(context);
    	return;
        }
        INT_GetRealModeContext(p, &context16);
    
        DPMI_CallRMProc( &context16, ((LPWORD)PTR_SEG_OFF_TO_LIN(context->SegSs, LOWORD(context->Esp)))+3,
    
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        INT_SetRealModeContext(p, &context16);
    }
    
    
    
    static RMCB *DPMI_AllocRMCB( void )
    
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    {
        RMCB *NewRMCB = HeapAlloc(GetProcessHeap(), 0, sizeof(RMCB));
        UINT16 uParagraph;
    
        if (NewRMCB)
        {
    
    	LPVOID RMCBmem = DOSMEM_GetBlock(4, &uParagraph);
    
    	LPBYTE p = RMCBmem;
    
    	*p++ = 0xcd; /* RMCB: */
    	*p++ = 0x31; /* int $0x31 */
    /* it is the called procedure's task to change the return CS:EIP
       the DPMI 0.9 spec states that if it doesn't, it will be called again */
    	*p++ = 0xeb;
    	*p++ = 0xfc; /* jmp RMCB */
    
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    	NewRMCB->address = MAKELONG(0, uParagraph);
    	NewRMCB->next = FirstRMCB;
    	FirstRMCB = NewRMCB;
    
    static void AllocRMCB( CONTEXT86 *context )
    
    {
        RMCB *NewRMCB = DPMI_AllocRMCB();
    
    
        TRACE("Function to call: %04x:%04x\n", (WORD)context->SegDs, SI_reg(context) );
    
    
        if (NewRMCB)
        {
    	/* FIXME: if 32-bit DPMI client, use ESI and EDI */
    
    	NewRMCB->proc_ofs = LOWORD(context->Esi);
    	NewRMCB->proc_sel = context->SegDs;
    	NewRMCB->regs_ofs = LOWORD(context->Edi);
    	NewRMCB->regs_sel = context->SegEs;
    	SET_LOWORD( context->Ecx, HIWORD(NewRMCB->address) );
    	SET_LOWORD( context->Edx, LOWORD(NewRMCB->address) );
    
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        }
        else
        {
    
    	SET_LOWORD( context->Eax, 0x8015 ); /* callback unavailable */
    
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    	SET_CFLAG(context);
        }
    }
    
    
    
    FARPROC16 WINAPI DPMI_AllocInternalRMCB( RMCBPROC proc )
    {
        RMCB *NewRMCB = DPMI_AllocRMCB();
    
        if (NewRMCB) {
            NewRMCB->proc_ofs = (DWORD)proc;
            NewRMCB->proc_sel = 0;
            NewRMCB->regs_ofs = 0;
            NewRMCB->regs_sel = 0;
            return (FARPROC16)(NewRMCB->address);
        }
        return NULL;
    }
    
    
    static int DPMI_FreeRMCB( DWORD address )
    
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    {
        RMCB *CurrRMCB = FirstRMCB;
        RMCB *PrevRMCB = NULL;
    
    
        while (CurrRMCB && (CurrRMCB->address != address))
    
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        {
    	PrevRMCB = CurrRMCB;
    	CurrRMCB = CurrRMCB->next;
        }
        if (CurrRMCB)
        {
    	if (PrevRMCB)
    	PrevRMCB->next = CurrRMCB->next;
    	    else
    	FirstRMCB = CurrRMCB->next;
    
    	DOSMEM_FreeBlock(DOSMEM_MapRealToLinear(CurrRMCB->address));
    
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    	HeapFree(GetProcessHeap(), 0, CurrRMCB);
    
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        }
    
    static void FreeRMCB( CONTEXT86 *context )
    
        FIXME("callback address: %04x:%04x\n",
    
              CX_reg(context), DX_reg(context));
    
        if (DPMI_FreeRMCB(MAKELONG(DX_reg(context), CX_reg(context)))) {
    
    	SET_LOWORD( context->Eax, 0x8024 ); /* invalid callback address */
    
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    	SET_CFLAG(context);
        }
    }
    
    
    
    void WINAPI DPMI_FreeInternalRMCB( FARPROC16 proc )
    {
        DPMI_FreeRMCB( (DWORD)proc );
    }
    
    
    
    /* (see dosmem.c, function DOSMEM_InitDPMI) */
    
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    static void StartPM( CONTEXT86 *context, LPDOSTASK lpDosTask )
    
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    {
        UINT16 cs, ss, ds, es;
    
        DWORD psp_ofs = (DWORD)(lpDosTask->psp_seg<<4);
    
        PDB16 *psp = (PDB16 *)psp_ofs;
    
        HANDLE16 env_seg = psp->environment;
    
        unsigned char selflags = WINE_LDT_FLAGS_DATA;
    
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        RESET_CFLAG(context);
        lpDosTask->dpmi_flag = AX_reg(context);
    /* our mode switch wrapper have placed the desired CS into DX */
    
        cs = SELECTOR_AllocBlock( (void *)(DX_reg(context)<<4), 0x10000, WINE_LDT_FLAGS_CODE );
    
    /* due to a flaw in some CPUs (at least mine), it is best to mark stack segments as 32-bit if they
       can be used in 32-bit code. Otherwise, these CPUs may not set the high word of esp during a
       ring transition (from kernel code) to the 16-bit stack, and this causes trouble if executing
       32-bit code using this stack. */
    
        if (lpDosTask->dpmi_flag & 1) selflags |= WINE_LDT_FLAGS_32BIT;
        ss = SELECTOR_AllocBlock( (void *)(context->SegSs<<4), 0x10000, selflags );
    
    /* do the same for the data segments, just in case */
    
        if (context->SegDs == context->SegSs) ds = ss;
    
        else ds = SELECTOR_AllocBlock( (void *)(context->SegDs<<4), 0x10000, selflags );
        es = SELECTOR_AllocBlock( psp, 0x100, selflags );
    
    /* convert environment pointer, as the spec says, but we're a bit lazy about the size here... */
    
        psp->environment = SELECTOR_AllocBlock( (void *)(env_seg<<4), 0x10000, WINE_LDT_FLAGS_DATA );
    
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        pm_ctx = *context;
    
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    /* our mode switch wrapper expects the new CS in DX, and the new SS in AX */
    
        pm_ctx.Eax   = ss;
        pm_ctx.Edx   = cs;
        pm_ctx.SegDs = ds;
        pm_ctx.SegEs = es;
        pm_ctx.SegFs = 0;
        pm_ctx.SegGs = 0;
    
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        TRACE("DOS program is now entering protected mode\n");
    
        wine_call_to_16_regs_short(&pm_ctx, 0);
    
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        /* in the current state of affairs, we won't ever actually return here... */
    
        /* we should have int21/ah=4c do it someday, though... */
    
    
        FreeSelector16(psp->environment);
    
        psp->environment = env_seg;
    
        FreeSelector16(es);
        if (ds != ss) FreeSelector16(ds);
        FreeSelector16(ss);
        FreeSelector16(cs);
    
    void WINAPI DPMI_RawModeSwitch( SIGCONTEXT *context )
    {
      LPDOSTASK lpDosTask = MZ_Current();
    
      int ret;
    
      if (!lpDosTask) {
        /* we could probably start a DPMI-only dosmod task here, but I doubt
           anything other than real DOS apps want to call raw mode switch */
    
        ERR("attempting raw mode switch without DOS task!\n");
    
        ExitProcess(1);
      }
      /* initialize real-mode context as per spec */
      memset(&rm_ctx, 0, sizeof(rm_ctx));
    
      rm_ctx.SegDs  = AX_sig(context);
      rm_ctx.SegEs  = CX_sig(context);
      rm_ctx.SegSs  = DX_sig(context);
      rm_ctx.Esp    = EBX_sig(context);
      rm_ctx.SegCs  = SI_sig(context);
      rm_ctx.Eip    = EDI_sig(context);
      rm_ctx.Ebp    = EBP_sig(context);
      rm_ctx.SegFs  = 0;
      rm_ctx.SegGs  = 0;
      rm_ctx.EFlags = EFL_sig(context); /* at least we need the IF flag */
    
      TRACE("re-entering real mode at %04lx:%04lx\n",rm_ctx.SegCs,rm_ctx.Eip);
    
      ret = DOSVM_Enter( &rm_ctx );
      /* when the real-mode stuff call its mode switch address,
         DOSVM_Enter will return and we will continue here */
    
      if (ret<0) {
        /* if the sync was lost, there's no way to recover */
        ExitProcess(1);
      }
    
      /* alter protected-mode context as per spec */
    
      DS_sig(context)  = LOWORD(rm_ctx.Eax);
      ES_sig(context)  = LOWORD(rm_ctx.Ecx);
      SS_sig(context)  = LOWORD(rm_ctx.Edx);
      ESP_sig(context) = rm_ctx.Ebx;
      CS_sig(context)  = LOWORD(rm_ctx.Esi);
      EIP_sig(context) = rm_ctx.Edi;
      EBP_sig(context) = rm_ctx.Ebp;
    
      FS_sig(context) = 0;
      GS_sig(context) = 0;
    
      /* Return to new address and hope that we didn't mess up */
    
      TRACE("re-entering protected mode at %04x:%08lx\n",
    
    	CS_sig(context), EIP_sig(context));
    }
    
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    /**********************************************************************
    
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     *	    INT_Int31Handler
    
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     *
    
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     * Handler for int 31h (DPMI).
    
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     */
    
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    void WINAPI INT_Int31Handler( CONTEXT86 *context )
    
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    {
    
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        /*
         * Note: For Win32s processes, the whole linear address space is
         *       shifted by 0x10000 relative to the OS linear address space.
         *       See the comment in msdos/vxd.c.
         */
    
        DWORD offset = W32S_APPLICATION() ? W32S_OFFSET : 0;
    
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        DWORD dw;
        BYTE *ptr;
    
    
        LPDOSTASK lpDosTask = MZ_Current();
    
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        if (ISV86(context) && lpDosTask) {
    
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            /* Called from real mode, check if it's our wrapper */
    
            if (context->SegCs==DOSMEM_dpmi_seg) {
    
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                /* This is the protected mode switch */
    
                StartPM(context,lpDosTask);
    
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                return;
    
            if (context->SegCs==DOSMEM_xms_seg) {
    
                /* This is the XMS driver entry point */
                XMS_Handler(context);
                return;
    
            } else
            {
                /* Check for RMCB */
                RMCB *CurrRMCB = FirstRMCB;
                
    
                while (CurrRMCB && (HIWORD(CurrRMCB->address) != context->SegCs))
    
                    CurrRMCB = CurrRMCB->next;
                
                if (CurrRMCB) {
                    /* RMCB call, propagate to protected-mode handler */
    
                    DPMI_CallRMCBProc(context, CurrRMCB, lpDosTask->dpmi_flag);
    
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        RESET_CFLAG(context);
        switch(AX_reg(context))
    
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        {
        case 0x0000:  /* Allocate LDT descriptors */
    
        	TRACE("allocate LDT descriptors (%d)\n",CX_reg(context));
    
            if (!(context->Eax = AllocSelectorArray16( CX_reg(context) )))
    
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            {
    
                context->Eax = 0x8011;  /* descriptor unavailable */
    
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                SET_CFLAG(context);
    
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            }
    
    	TRACE("success, array starts at 0x%04x\n",AX_reg(context));
    
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            break;
    
        case 0x0001:  /* Free LDT descriptor */
    
        	TRACE("free LDT descriptor (0x%04x)\n",BX_reg(context));
    
            if (FreeSelector16( BX_reg(context) ))
    
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            {
    
                context->Eax = 0x8022;  /* invalid selector */
    
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                SET_CFLAG(context);
    
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            }
    
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            else
            {
                /* If a segment register contains the selector being freed, */
                /* set it to zero. */
    
                if (!((context->SegDs^BX_reg(context)) & ~3)) context->SegDs = 0;
                if (!((context->SegEs^BX_reg(context)) & ~3)) context->SegEs = 0;
                if (!((context->SegFs^BX_reg(context)) & ~3)) context->SegFs = 0;
                if (!((context->SegGs^BX_reg(context)) & ~3)) context->SegGs = 0;
    
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            }
    
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            break;
    
    
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        case 0x0002:  /* Real mode segment to descriptor */
    
        	TRACE("real mode segment to descriptor (0x%04x)\n",BX_reg(context));
    
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            {
                WORD entryPoint = 0;  /* KERNEL entry point for descriptor */
    
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                switch(BX_reg(context))
    
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                {
                case 0x0000: entryPoint = 183; break;  /* __0000H */
                case 0x0040: entryPoint = 193; break;  /* __0040H */
                case 0xa000: entryPoint = 174; break;  /* __A000H */
                case 0xb000: entryPoint = 181; break;  /* __B000H */
                case 0xb800: entryPoint = 182; break;  /* __B800H */
                case 0xc000: entryPoint = 195; break;  /* __C000H */
                case 0xd000: entryPoint = 179; break;  /* __D000H */
                case 0xe000: entryPoint = 190; break;  /* __E000H */
                case 0xf000: entryPoint = 194; break;  /* __F000H */
                default:
    
    	    	context->Eax = DOSMEM_AllocSelector(BX_reg(context));
    
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                    break;
                }
                if (entryPoint) 
    
                    context->Eax = LOWORD(GetProcAddress16( GetModuleHandle16( "KERNEL" ),
                                                            (LPCSTR)(ULONG_PTR)entryPoint ));
    
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            }
            break;
    
    
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        case 0x0003:  /* Get next selector increment */
    
        	TRACE("get selector increment (__AHINCR)\n");
    
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            break;
    
        case 0x0004:  /* Lock selector (not supported) */
    
        	FIXME("lock selector not supported\n");
    
            context->Eax = 0;  /* FIXME: is this a correct return value? */
    
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            break;
    
        case 0x0005:  /* Unlock selector (not supported) */
    
        	FIXME("unlock selector not supported\n");
    
            context->Eax = 0;  /* FIXME: is this a correct return value? */
    
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            break;
    
        case 0x0006:  /* Get selector base address */
    
        	TRACE("get selector base address (0x%04x)\n",BX_reg(context));
    
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            if (!(dw = GetSelectorBase( BX_reg(context) )))
    
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            {
    
                context->Eax = 0x8022;  /* invalid selector */
    
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                SET_CFLAG(context);
    
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            }
            else
            {
    
                CX_reg(context) = HIWORD(W32S_WINE2APP(dw, offset));
                DX_reg(context) = LOWORD(W32S_WINE2APP(dw, offset));
    
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            }
            break;
    
        case 0x0007:  /* Set selector base address */
    
        	TRACE("set selector base address (0x%04x,0x%08lx)\n",
    
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                         BX_reg(context),
    
                         W32S_APP2WINE(MAKELONG(DX_reg(context),CX_reg(context)), offset));
            dw = W32S_APP2WINE(MAKELONG(DX_reg(context), CX_reg(context)), offset);
    
            if (dw < 0x10000)
                /* app wants to access lower 64K of DOS memory, map it in now */
                DOSMEM_Init(TRUE);
    
            SetSelectorBase(BX_reg(context), dw);
    
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            break;
    
        case 0x0008:  /* Set selector limit */
    
        	TRACE("set selector limit (0x%04x,0x%08lx)\n",BX_reg(context),MAKELONG(DX_reg(context),CX_reg(context)));
    
            dw = MAKELONG( DX_reg(context), CX_reg(context) );
    
            SetSelectorLimit16( BX_reg(context), dw );
    
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            break;
    
        case 0x0009:  /* Set selector access rights */
    
        	TRACE("set selector access rights(0x%04x,0x%04x)\n",BX_reg(context),CX_reg(context));
    
            SelectorAccessRights16( BX_reg(context), 1, CX_reg(context) );
    
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            break;
    
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        case 0x000a:  /* Allocate selector alias */
    
        	TRACE("allocate selector alias (0x%04x)\n",BX_reg(context));
    
            if (!(AX_reg(context) = AllocCStoDSAlias16( BX_reg(context) )))
    
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            {
    
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                AX_reg(context) = 0x8011;  /* descriptor unavailable */
                SET_CFLAG(context);
    
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            }
            break;
    
        case 0x000b:  /* Get descriptor */
    
        	TRACE("get descriptor (0x%04x)\n",BX_reg(context));
    
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            {
    
                LDT_ENTRY entry;
                wine_ldt_set_base( &entry, (void*)W32S_WINE2APP(wine_ldt_get_base(&entry), offset) );
    
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                /* FIXME: should use ES:EDI for 32-bit clients */
    
                *(LDT_ENTRY *)PTR_SEG_OFF_TO_LIN( context->SegEs, LOWORD(context->Edi) ) = entry;
    
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            }
            break;
    
        case 0x000c:  /* Set descriptor */
    
        	TRACE("set descriptor (0x%04x)\n",BX_reg(context));
    
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            {
    
                LDT_ENTRY entry = *(LDT_ENTRY *)PTR_SEG_OFF_TO_LIN( context->SegEs,
                                                                    LOWORD(context->Edi) );
                wine_ldt_set_base( &entry, (void*)W32S_APP2WINE(wine_ldt_get_base(&entry), offset) );
                wine_ldt_set_entry( LOWORD(context->Ebx), &entry );
    
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            }
            break;
    
        case 0x000d:  /* Allocate specific LDT descriptor */
    
        	FIXME("allocate descriptor (0x%04x), stub!\n",BX_reg(context));
    
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            AX_reg(context) = 0x8011; /* descriptor unavailable */
            SET_CFLAG(context);
    
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            break;
    
        case 0x0100:  /* Allocate DOS memory block */
    
            TRACE("allocate DOS memory block (0x%x paragraphs)\n",BX_reg(context));
    
            dw = GlobalDOSAlloc16((DWORD)BX_reg(context)<<4);
    
            if (dw) {
                AX_reg(context) = HIWORD(dw);
                DX_reg(context) = LOWORD(dw);
            } else {
                AX_reg(context) = 0x0008; /* insufficient memory */
    
                BX_reg(context) = DOSMEM_Available()>>4;
    
                SET_CFLAG(context);
            }
            break;
        case 0x0101:  /* Free DOS memory block */
    
            TRACE("free DOS memory block (0x%04x)\n",DX_reg(context));
    
            dw = GlobalDOSFree16(DX_reg(context));
    
            if (!dw) {
                AX_reg(context) = 0x0009; /* memory block address invalid */
                SET_CFLAG(context);
            }
            break;
    
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        case 0x0200: /* get real mode interrupt vector */
    
    	FIXME("get realmode interupt vector(0x%02x) unimplemented.\n",
    
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    	      BL_reg(context));
    
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        	SET_CFLAG(context);
            break;
        case 0x0201: /* set real mode interrupt vector */
    
    	FIXME("set realmode interrupt vector(0x%02x,0x%04x:0x%04x) unimplemented\n", BL_reg(context),CX_reg(context),DX_reg(context));
    
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        	SET_CFLAG(context);
            break;
    
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        case 0x0204:  /* Get protected mode interrupt vector */
    
        	TRACE("get protected mode interrupt handler (0x%02x), stub!\n",BL_reg(context));
    
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    	dw = (DWORD)INT_GetPMHandler( BL_reg(context) );
    
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    	CX_reg(context) = HIWORD(dw);
    	DX_reg(context) = LOWORD(dw);
    
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    	break;
    
        case 0x0205:  /* Set protected mode interrupt vector */
    
        	TRACE("set protected mode interrupt handler (0x%02x,%p), stub!\n",
    
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                BL_reg(context),PTR_SEG_OFF_TO_LIN(CX_reg(context),DX_reg(context)));
    
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    	INT_SetPMHandler( BL_reg(context),
                              (FARPROC16)PTR_SEG_OFF_TO_SEGPTR( CX_reg(context),
                                                                DX_reg(context) ));
    
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    	break;
    
    
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        case 0x0300:  /* Simulate real mode interrupt */
    
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            break;
    
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        case 0x0301:  /* Call real mode procedure with far return */
    
    	CallRMProc( context, FALSE );
    
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    	break;
    
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        case 0x0302:  /* Call real mode procedure with interrupt return */
    
    	CallRMProc( context, TRUE );
    
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            break;
    
    
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        case 0x0303:  /* Allocate Real Mode Callback Address */
    
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    	AllocRMCB( context );
    	break;
    
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        case 0x0304:  /* Free Real Mode Callback Address */
    
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    	FreeRMCB( context );
    
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    	break;
    
    
        case 0x0305:  /* Get State Save/Restore Addresses */
    
            TRACE("get state save/restore addresses\n");
    
            /* we probably won't need this kind of state saving */
            AX_reg(context) = 0;
    	/* real mode: just point to the lret */
    
    	BX_reg(context) = DOSMEM_wrap_seg;
    
    	/* protected mode: don't have any handler yet... */
    
    	FIXME("no protected-mode dummy state save/restore handler yet\n");
    
            break;
    
        case 0x0306:  /* Get Raw Mode Switch Addresses */
    
            TRACE("get raw mode switch addresses\n");
    
            /* real mode, point to standard DPMI return wrapper */
            BX_reg(context) = DOSMEM_wrap_seg;
    
            /* protected mode, point to DPMI call wrapper */
            SI_reg(context) = DOSMEM_dpmi_sel;
    
            context->Edi = 8; /* offset of the INT 0x31 call */
    
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        case 0x0400:  /* Get DPMI version */
    
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        	{
    	    SYSTEM_INFO si;
    
    	    GetSystemInfo(&si);
    	    AX_reg(context) = 0x005a;  /* DPMI version 0.90 */
    	    BX_reg(context) = 0x0005;  /* Flags: 32-bit, virtual memory */
    	    CL_reg(context) = si.wProcessorLevel;
    	    DX_reg(context) = 0x0102;  /* Master/slave interrupt controller base*/
    	    break;
    	}
    
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        case 0x0500:  /* Get free memory information */
    
            TRACE("get free memory information\n");
    
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            {
                MEMMANINFO mmi;
    
                mmi.dwSize = sizeof(mmi);
    
                ptr = (BYTE *)PTR_SEG_OFF_TO_LIN(context->SegEs,DI_reg(context));
    
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                /* the layout is just the same as MEMMANINFO, but without
                 * the dwSize entry.
                 */
                memcpy(ptr,((char*)&mmi)+4,sizeof(mmi)-4);
                break;
            }
    
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        case 0x0501:  /* Allocate memory block */
    
            TRACE("allocate memory block (%ld)\n",MAKELONG(CX_reg(context),BX_reg(context)));
    
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    	if (!(ptr = (BYTE *)DPMI_xalloc(MAKELONG(CX_reg(context), BX_reg(context)))))
    
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            {
    
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                AX_reg(context) = 0x8012;  /* linear memory not available */
                SET_CFLAG(context);
    
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            } else {
    
                BX_reg(context) = SI_reg(context) = HIWORD(W32S_WINE2APP(ptr, offset));
                CX_reg(context) = DI_reg(context) = LOWORD(W32S_WINE2APP(ptr, offset));
    
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            }
            break;