2 * COPYRIGHT: GPL - See COPYING in the top level directory
3 * PROJECT: ReactOS Virtual DOS Machine
5 * PURPOSE: Minimal x86 machine emulator for the VDM
6 * PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
12 /* INCLUDES *******************************************************************/
17 /* DEFINES ********************************************************************/
19 /* Basic Memory Management */
20 #define MEM_ALIGN_UP(ptr, align) MEM_ALIGN_DOWN((ULONG_PTR)(ptr) + (align) - 1l, (align))
21 #define MEM_ALIGN_DOWN(ptr, align) (PVOID)((ULONG_PTR)(ptr) & ~((align) - 1l))
23 #define TO_LINEAR(seg, off) (((seg) << 4) + (off))
24 #define MAX_SEGMENT 0xFFFF
25 #define MAX_OFFSET 0xFFFF
26 #define MAX_ADDRESS 0x1000000 // 16 MB of RAM; see also: kernel32/client/vdm.c!BaseGetVdmConfigInfo
28 #define FAR_POINTER(x) \
29 (PVOID)((ULONG_PTR)BaseAddress + TO_LINEAR(HIWORD(x), LOWORD(x)))
31 #define SEG_OFF_TO_PTR(seg, off) \
32 (PVOID)((ULONG_PTR)BaseAddress + TO_LINEAR((seg), (off)))
34 #define REAL_TO_PHYS(ptr) (PVOID)((ULONG_PTR)(ptr) + (ULONG_PTR)BaseAddress)
35 #define PHYS_TO_REAL(ptr) (PVOID)((ULONG_PTR)(ptr) - (ULONG_PTR)BaseAddress)
38 /* BCD-Binary conversion */
42 BINARY_TO_BCD(USHORT Value
)
46 Result
= (Value
/ 1000) << 12;
48 Result
|= (Value
/ 100) << 8;
50 Result
|= (Value
/ 10) << 4;
59 BCD_TO_BINARY(USHORT Value
)
65 Result
+= (Value
& 0xF) * 10;
67 Result
+= (Value
& 0xF) * 100;
69 Result
+= Value
* 1000;
74 /* System I/O ports */
75 #define CONTROL_SYSTEM_PORT61H 0x61
80 EMULATOR_EXCEPTION_DIVISION_BY_ZERO
,
81 EMULATOR_EXCEPTION_DEBUG
,
82 EMULATOR_EXCEPTION_NMI
,
83 EMULATOR_EXCEPTION_BREAKPOINT
,
84 EMULATOR_EXCEPTION_OVERFLOW
,
85 EMULATOR_EXCEPTION_BOUND
,
86 EMULATOR_EXCEPTION_INVALID_OPCODE
,
87 EMULATOR_EXCEPTION_NO_FPU
,
88 EMULATOR_EXCEPTION_DOUBLE_FAULT
,
89 EMULATOR_EXCEPTION_FPU_SEGMENT
,
90 EMULATOR_EXCEPTION_INVALID_TSS
,
91 EMULATOR_EXCEPTION_NO_SEGMENT
,
92 EMULATOR_EXCEPTION_STACK_SEGMENT
,
93 EMULATOR_EXCEPTION_GPF
,
94 EMULATOR_EXCEPTION_PAGE_FAULT
97 // extern FAST486_STATE EmulatorContext;
98 extern LPVOID BaseAddress
;
99 extern BOOLEAN VdmRunning
;
101 /* FUNCTIONS ******************************************************************/
103 VOID
DumpMemory(BOOLEAN TextFormat
);
105 VOID WINAPI EmulatorReadMemory
107 PFAST486_STATE State
,
113 VOID WINAPI EmulatorWriteMemory
115 PFAST486_STATE State
,
121 UCHAR WINAPI EmulatorIntAcknowledge
126 VOID WINAPI EmulatorFpu
131 VOID
EmulatorException(BYTE ExceptionNumber
, LPWORD Stack
);
133 VOID
EmulatorTerminate(VOID
);
135 VOID
EmulatorInterruptSignal(VOID
);
136 VOID
EmulatorSetA20(BOOLEAN Enabled
);
138 BOOLEAN
EmulatorInitialize(HANDLE ConsoleInput
, HANDLE ConsoleOutput
);
139 VOID
EmulatorCleanup(VOID
);
141 #endif // _EMULATOR_H_