ReactOS 0.4.15-dev-5664-g3bf4ef6
callback.h File Reference
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Classes

struct  _CALLBACK16
 

Macros

#define BOP(num)   LOBYTE(EMULATOR_BOP), HIBYTE(EMULATOR_BOP), (num)
 
#define UnSimulate16(trap)
 
#define TRAMPOLINE_SIZE   sizeof(ULONGLONG)
 

Typedefs

typedef struct _CALLBACK16 CALLBACK16
 
typedef struct _CALLBACK16PCALLBACK16
 

Functions

VOID InitializeContextEx (IN PCALLBACK16 Context, IN ULONG TrampolineSize, IN USHORT Segment, IN USHORT Offset)
 
VOID InitializeContext (IN PCALLBACK16 Context, IN USHORT Segment, IN USHORT Offset)
 
VOID Call16 (IN USHORT Segment, IN USHORT Offset)
 
VOID RunCallback16 (IN PCALLBACK16 Context, IN ULONG FarPtr)
 
ULONG RegisterCallback16 (IN ULONG FarPtr, IN LPBYTE CallbackCode, IN SIZE_T CallbackSize, OUT PSIZE_T CodeSize OPTIONAL)
 

Macro Definition Documentation

◆ BOP

Definition at line 15 of file callback.h.

◆ TRAMPOLINE_SIZE

#define TRAMPOLINE_SIZE   sizeof(ULONGLONG)

Definition at line 24 of file callback.h.

◆ UnSimulate16

#define UnSimulate16 (   trap)
Value:
do { \
*(PUSHORT)(trap) = EMULATOR_BOP; \
(trap) += sizeof(USHORT); \
*(trap) = BOP_UNSIMULATE; \
} while(0)
#define EMULATOR_BOP
Definition: bop.h:16
#define BOP_UNSIMULATE
Definition: isvbop.h:31
unsigned short * PUSHORT
Definition: retypes.h:2
unsigned short USHORT
Definition: pedump.c:61

Definition at line 16 of file callback.h.

Typedef Documentation

◆ CALLBACK16

◆ PCALLBACK16

Function Documentation

◆ Call16()

VOID Call16 ( IN USHORT  Segment,
IN USHORT  Offset 
)

Definition at line 71 of file callback.c.

73{
74 /* Save CS:IP */
75 USHORT OrgCS = getCS();
76 USHORT OrgIP = getIP();
77
78 /* Set the new CS:IP */
81
82 DPRINT("Call16(%04X:%04X)\n", Segment, Offset);
83
84 /* Start CPU simulation */
86
87 /* Restore CS:IP */
88 setCS(OrgCS);
89 setIP(OrgIP);
90}
_In_ ULONG _In_ ULONG Offset
Definition: ntddpcm.h:101
#define DPRINT
Definition: sndvol32.h:71
VOID CpuSimulate(VOID)
Definition: cpu.c:167
USHORT WINAPI getIP(VOID)
Definition: registers.c:464
VOID WINAPI setCS(USHORT)
Definition: registers.c:487
USHORT WINAPI getCS(VOID)
Definition: registers.c:480
VOID WINAPI setIP(USHORT)
Definition: registers.c:471
_Inout_ PVOID Segment
Definition: exfuncs.h:1101

Referenced by Int32Call(), and RunCallback16().

◆ InitializeContext()

VOID InitializeContext ( IN PCALLBACK16  Context,
IN USHORT  Segment,
IN USHORT  Offset 
)

Definition at line 60 of file callback.c.

63{
66 Segment,
67 Offset);
68}
VOID InitializeContextEx(IN PCALLBACK16 Context, IN ULONG TrampolineSize, IN USHORT Segment, IN USHORT Offset)
Definition: callback.c:48
#define TRAMPOLINE_SIZE
Definition: callback.h:24

Referenced by DosBootsectorInitialize(), DosKRNLInitialize(), DosMouseInitialize(), DosStart(), InitializeBiosInt32(), and KsCreateDefaultAllocatorEx().

◆ InitializeContextEx()

VOID InitializeContextEx ( IN PCALLBACK16  Context,
IN ULONG  TrampolineSize,
IN USHORT  Segment,
IN USHORT  Offset 
)

Definition at line 48 of file callback.c.

52{
53 Context->TrampolineFarPtr = MAKELONG(Offset, Segment);
54 Context->TrampolineSize = max(TRAMPOLINE_SIZE, TrampolineSize);
55 Context->Segment = Segment;
56 Context->NextOffset = Offset + Context->TrampolineSize;
57}
#define max(a, b)
Definition: svc.c:63
#define MAKELONG(a, b)
Definition: typedefs.h:249

Referenced by InitializeContext().

◆ RegisterCallback16()

ULONG RegisterCallback16 ( IN ULONG  FarPtr,
IN LPBYTE  CallbackCode,
IN SIZE_T  CallbackSize,
OUT PSIZE_T CodeSize  OPTIONAL 
)

Definition at line 120 of file callback.c.

124{
125 LPBYTE CodeStart = (LPBYTE)FAR_POINTER(FarPtr);
126 LPBYTE Code = CodeStart;
127
128 SIZE_T OurCodeSize = CallbackSize;
129
130 if (CallbackCode == NULL) CallbackSize = 0;
131
132 if (CallbackCode)
133 {
134 /* 16-bit interrupt code */
135 RtlCopyMemory(Code, CallbackCode, CallbackSize);
136 Code += CallbackSize;
137 }
138
139 /* Return the real size of the code if needed */
140 if (CodeSize) *CodeSize = OurCodeSize; // == (ULONG_PTR)Code - (ULONG_PTR)CodeStart;
141
142 // /* Return the entry-point address for 32-bit calls */
143 // return (ULONG_PTR)(CodeStart + CallbackSize);
144 return OurCodeSize;
145}
#define NULL
Definition: types.h:112
#define FAR_POINTER(x)
Definition: emulator.h:35
unsigned char * LPBYTE
Definition: typedefs.h:53
ULONG_PTR SIZE_T
Definition: typedefs.h:80
#define RtlCopyMemory(Destination, Source, Length)
Definition: typedefs.h:263
_In_ UCHAR _In_ UCHAR _In_ ULONG Code
Definition: wdfdevice.h:1701

Referenced by RegisterInt16().

◆ RunCallback16()

VOID RunCallback16 ( IN PCALLBACK16  Context,
IN ULONG  FarPtr 
)

Definition at line 93 of file callback.c.

95{
96 PUCHAR TrampolineBase = (PUCHAR)FAR_POINTER(Context->TrampolineFarPtr);
97 PUCHAR Trampoline = TrampolineBase;
98 UCHAR OldTrampoline[TRAMPOLINE_SIZE];
99
100 /* Save the old trampoline */
101 ((PULONGLONG)&OldTrampoline)[0] = ((PULONGLONG)TrampolineBase)[0];
102
103 DPRINT("RunCallback16(0x%p)\n", FarPtr);
104
105 /* Build the generic entry-point for 16-bit far calls */
106 *Trampoline++ = 0x9A; // Call far seg:off
107 *(PULONG)Trampoline = FarPtr;
108 Trampoline += sizeof(ULONG);
109 UnSimulate16(Trampoline);
110
111 /* Perform the call */
112 Call16(HIWORD(Context->TrampolineFarPtr),
113 LOWORD(Context->TrampolineFarPtr));
114
115 /* Restore the old trampoline */
116 ((PULONGLONG)TrampolineBase)[0] = ((PULONGLONG)&OldTrampoline)[0];
117}
unsigned int * PULONG
Definition: retypes.h:1
unsigned char * PUCHAR
Definition: retypes.h:3
unsigned int ULONG
Definition: retypes.h:1
__GNU_EXTENSION typedef unsigned __int64 * PULONGLONG
Definition: ntbasedef.h:383
#define LOWORD(l)
Definition: pedump.c:82
VOID Call16(IN USHORT Segment, IN USHORT Offset)
Definition: callback.c:71
#define UnSimulate16(trap)
Definition: callback.h:16
#define HIWORD(l)
Definition: typedefs.h:247
unsigned char UCHAR
Definition: xmlstorage.h:181

Referenced by BiosMouseIrq(), CallMouseUserHandlers(), DosCallDriver(), and InitRomRange().