2 * COPYRIGHT: GPL - See COPYING in the top level directory
3 * PROJECT: ReactOS Virtual DOS Machine
5 * PURPOSE: 32-bit Interrupt Handlers
6 * PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
7 * Hermes Belusca-Maito (hermes.belusca@sfr.fr)
10 /* INCLUDES *******************************************************************/
20 /* PRIVATE VARIABLES **********************************************************/
23 * This is the list of registered 32-bit Interrupt handlers.
25 static EMULATOR_INT32_PROC Int32Proc
[EMULATOR_MAX_INT32_NUM
] = { NULL
};
28 #define BOP_CONTROL 0xFF // Control BOP Handler
29 #define BOP_CONTROL_DEFFUNC 0x00 // Default Control BOP Function
30 #define BOP_CONTROL_INT32 0xFF // 32-bit Interrupt dispatcher
32 #define INT16_TRAMPOLINE_SIZE sizeof(ULONGLONG) // == TRAMPOLINE_SIZE
34 /* 16-bit generic interrupt code for calling a 32-bit interrupt handler */
35 static BYTE Int16To32
[] =
39 /* Push the value of the interrupt to be called */
40 0x6A, 0xFF, // push i (patchable to 0x6A, 0xIntNum)
42 /* The BOP Sequence */
45 BOP(BOP_CONTROL
), // Control BOP
46 BOP_CONTROL_INT32
, // 32-bit Interrupt dispatcher
48 0x73, 0x04, // jnc EXIT (offset +4)
54 0xEB, 0xF5, // jmp BOP_SEQ (offset -11)
57 0x44, 0x44, // inc sp, inc sp
60 const ULONG Int16To32StubSize
= sizeof(Int16To32
);
62 /* PUBLIC FUNCTIONS ***********************************************************/
64 static VOID WINAPI
Int32Dispatch(LPWORD Stack
)
66 /* Get the interrupt number */
67 BYTE IntNum
= LOBYTE(Stack
[STACK_INT_NUM
]);
69 /* Call the 32-bit Interrupt handler */
70 if (Int32Proc
[IntNum
] != NULL
)
71 Int32Proc
[IntNum
](Stack
);
73 DPRINT1("Unhandled 32-bit interrupt: 0x%02X, AX = 0x%04X\n", IntNum
, getAX());
76 static VOID WINAPI
ControlBop(LPWORD Stack
)
78 /* Get the Function Number and skip it */
79 BYTE FuncNum
= *(PBYTE
)SEG_OFF_TO_PTR(getCS(), getIP());
84 case BOP_CONTROL_INT32
:
89 // DPRINT1("Unassigned Control BOP Function: 0x%02X\n", FuncNum);
90 DisplayMessage(L
"Unassigned Control BOP Function: 0x%02X", FuncNum
);
96 RegisterInt16(IN ULONG FarPtr
,
98 IN LPBYTE CallbackCode
,
99 IN SIZE_T CallbackSize
,
100 OUT PSIZE_T CodeSize OPTIONAL
)
102 /* Get a pointer to the IVT and set the corresponding entry (far pointer) */
103 LPDWORD IntVecTable
= (LPDWORD
)SEG_OFF_TO_PTR(0x0000, 0x0000);
104 IntVecTable
[IntNumber
] = FarPtr
;
106 /* Register the 16-bit callback */
107 return RegisterCallback16(FarPtr
,
114 RegisterInt32(IN ULONG FarPtr
,
116 IN EMULATOR_INT32_PROC IntHandler
,
117 OUT PSIZE_T CodeSize OPTIONAL
)
119 /* Array for holding our copy of the 16-bit interrupt callback */
120 BYTE IntCallback
[sizeof(Int16To32
)/sizeof(BYTE
)];
122 /* Check whether the 32-bit interrupt was already registered */
124 if (Int32Proc
[IntNumber
] != NULL
)
126 DPRINT1("RegisterInt32: Interrupt 0x%02X already registered!\n", IntNumber
);
131 /* Register the 32-bit interrupt handler */
132 Int32Proc
[IntNumber
] = IntHandler
;
134 /* Copy the generic 16-bit interrupt callback and patch it */
135 RtlCopyMemory(IntCallback
, Int16To32
, sizeof(Int16To32
));
136 IntCallback
[2] = IntNumber
;
138 /* Register the 16-bit interrupt callback */
139 return RegisterInt16(FarPtr
,
147 Int32Call(IN PCALLBACK16 Context
,
151 * TODO: This function has almost the same code as RunCallback16.
152 * Something that may be nice is to have a common interface to
153 * build the trampoline...
156 PUCHAR TrampolineBase
= (PUCHAR
)FAR_POINTER(Context
->TrampolineFarPtr
);
157 PUCHAR Trampoline
= TrampolineBase
;
158 UCHAR OldTrampoline
[INT16_TRAMPOLINE_SIZE
];
160 DPRINT("Int32Call(0x%02X)\n", IntNumber
);
162 ASSERT(Context
->TrampolineSize
== INT16_TRAMPOLINE_SIZE
);
164 /* Save the old trampoline */
165 ((PULONGLONG
)&OldTrampoline
)[0] = ((PULONGLONG
)TrampolineBase
)[0];
167 /* Build the generic entry-point for 16-bit calls */
168 if (IntNumber
== 0x03)
170 /* We are redefining for INT 03h */
171 *Trampoline
++ = 0xCC; // Call INT 03h
172 /** *Trampoline++ = 0x90; // nop **/
176 /* Normal interrupt */
177 *Trampoline
++ = 0xCD; // Call INT XXh
178 *Trampoline
++ = IntNumber
;
180 UnSimulate16(Trampoline
);
182 /* Perform the call */
183 Call16(HIWORD(Context
->TrampolineFarPtr
),
184 LOWORD(Context
->TrampolineFarPtr
));
186 /* Restore the old trampoline */
187 ((PULONGLONG
)TrampolineBase
)[0] = ((PULONGLONG
)&OldTrampoline
)[0];
190 VOID
InitializeInt32(VOID
)
192 /* Register the Control BOP */
193 RegisterBop(BOP_CONTROL
, ControlBop
);