112 lines
3.7 KiB
C
112 lines
3.7 KiB
C
/*-
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* Copyright (c) 1997 Helmut Wirth <hfwirth@ping.at>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice immediately at the beginning of the file, witout modification,
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* this list of conditions, and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <ctype.h>
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#include "doscmd.h"
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#include "emuint.h"
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/* The central entry point for the emulator interrupt. This is used by
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* different special programs to call the emulator from VM86 space.
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* Look at emuint.h for definitions and a list of the currently defined
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* subfunctions.
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* To call emuint from VM86 space do:
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* push ax Save original ax value (*must be done* !)
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* mov ah, funcnum Emuint function number to ah
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* mov al, subfunc Subfunction number, optional, depening on func
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* int 0xff
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* ..
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* ..
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* Emuint saves the function and subfunction numbers internally, then
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* pops ax off the stack and calls the function handler with the original
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* value in ax.
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*/
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void
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emuint(regcontext_t *REGS)
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{
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u_short func, subfunc;
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/* Remove function number from stack */
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func = R_AH;
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subfunc = R_AL;
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R_AX = POP(REGS);
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/* Call the function handler, subfunction is ignored, if unused */
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switch (func)
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{
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/* The redirector call */
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case EMU_REDIR:
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intff(REGS);
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break;
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/* EMS call, used by emsdriv.sys */
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case EMU_EMS:
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{
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switch (subfunc)
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{
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case EMU_EMS_CTL:
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R_AX = (u_short)ems_init();
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break;
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case EMU_EMS_CALL:
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ems_entry(REGS);
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break;
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default:
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debug(D_ALWAYS, "Undefined subfunction for EMS call\n");
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break;
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}
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break;
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}
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default:
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debug(D_ALWAYS, "Emulator interrupt called with undefined function %02x\n", func);
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/*
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* XXX
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* temporary backwards compatibility with instbsdi.exe
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* remove after a while.
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*/
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fprintf(stderr, "***\n*** WARNING - unknown emuint function\n");
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fprintf(stderr, "*** Continuing; assuming instbsdi redirector.\n");
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fprintf(stderr, "*** Please install the new redirector");
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fprintf(stderr, " `redir.com' as soon as possible.\n");
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fprintf(stderr, "*** This compatibility hack is not permanent.\n");
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fprintf(stderr, "***\n");
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PUSH(R_AX, REGS);
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R_BX = R_ES;
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R_DX = R_DI;
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R_DI = R_DS;
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intff(REGS);
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break;
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}
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}
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