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74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
/*
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* COPYRIGHT: GPL - See COPYING in the top level directory
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* PROJECT: ReactOS Virtual DOS Machine
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* FILE: subsystems/mvdm/ntvdm/bios/bios32/vidbios32.c
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* PURPOSE: VDM 32-bit Video BIOS
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* PROGRAMMERS: Hermes Belusca-Maito (hermes.belusca@sfr.fr)
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*
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* NOTE: All of the real code is in bios/vidbios.c
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*/
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/* INCLUDES *******************************************************************/
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#include "ntvdm.h"
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#define NDEBUG
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#include <debug.h>
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#include "emulator.h"
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#include "cpu/bop.h"
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#include "int32.h"
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#include "vidbios32.h"
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#include <bios/vidbios.h>
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#include "bios32p.h"
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/* DEFINES ********************************************************************/
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/* BOP Identifiers */
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#define BOP_VIDEO_INT 0x10
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/* PUBLIC FUNCTIONS ***********************************************************/
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extern VOID WINAPI VidBiosVideoService(LPWORD Stack);
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static VOID WINAPI VidBiosINT(LPWORD Stack)
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{
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/*
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* Set up a false stack to hardwire the BOP function (that can directly
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* manipulate CPU registers) to the 32-bit interrupt function (which uses
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* the stack to be able to modify the original CS:IP and FLAGS).
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*
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* See int32.h stack codes.
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*/
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WORD EmuStack[4];
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DWORD Flags = getEFLAGS();
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DPRINT1("Calling BOP VidBiosINT\n");
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EmuStack[STACK_FLAGS] = LOWORD(Flags);
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EmuStack[STACK_CS] = getCS();
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EmuStack[STACK_IP] = getIP();
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EmuStack[STACK_INT_NUM] = BOP_VIDEO_INT;
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VidBiosVideoService(EmuStack);
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setIP(EmuStack[STACK_IP]);
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setCS(EmuStack[STACK_CS]);
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setEFLAGS(MAKELONG(EmuStack[STACK_FLAGS], HIWORD(Flags)));
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}
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BOOLEAN VidBios32Initialize(VOID)
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{
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/* Register the BIOS support BOPs */
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RegisterBop(BOP_VIDEO_INT, VidBiosINT);
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return TRUE;
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}
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VOID VidBios32Cleanup(VOID)
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{
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/* Unregister the BIOS support BOPs */
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RegisterBop(BOP_VIDEO_INT, NULL);
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}
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/* EOF */
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