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[NTVDM]

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To make debugging easier, put the interrupt handlers at offset 0x1000,
and reserve 16 bytes for each. Also, move the common stub to offset
0x2000. That way the entry point of, for example, INT 0x21 is at
F000:1210.


svn path=/branches/ntvdm/; revision=60933
This commit is contained in:
Aleksandar Andrejevic 2013-11-11 02:27:29 +00:00
parent 153e815f93
commit cc1f7c6985
2 changed files with 25 additions and 22 deletions
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44
subsystems/ntvdm/int32.c
View file

@ -131,11 +131,31 @@ VOID WINAPI InitializeInt32(WORD BiosSegment)
LPDWORD IntVecTable = (LPDWORD)BaseAddress;
LPBYTE BiosCode = (LPBYTE)SEG_OFF_TO_PTR(BiosSegment, 0);
USHORT i;
WORD CommonStub, BopSeqOffset, Offset;
WORD BopSeqOffset, Offset = 0;
CommonStub = Offset = 0;
/* Generate ISR stubs and fill the IVT */
for (i = 0x00; i <= 0xFF; i++)
{
Offset = INT_HANDLER_OFFSET + (i << 4);
IntVecTable[i] = MAKELONG(Offset, BiosSegment);
BiosCode[Offset++] = 0xFA; // cli
BiosCode[Offset++] = 0x6A; // push i
BiosCode[Offset++] = (UCHAR)i;
BiosCode[Offset++] = 0x6A; // push 0
BiosCode[Offset++] = 0x00;
BopSeqOffset = COMMON_STUB_OFFSET - (Offset + 3);
BiosCode[Offset++] = 0xE9; // jmp near BOP_SEQ
BiosCode[Offset++] = LOBYTE(BopSeqOffset);
BiosCode[Offset++] = HIBYTE(BopSeqOffset);
}
/* Write the common stub code */
Offset = COMMON_STUB_OFFSET;
// BOP_SEQ:
BiosCode[Offset++] = 0xF8; // clc
@ -162,26 +182,6 @@ VOID WINAPI InitializeInt32(WORD BiosSegment)
BiosCode[Offset++] = 0x04;
BiosCode[Offset++] = 0xCF; // iret
/* Generate ISR stubs and fill the IVT */
for (i = 0x00; i <= 0xFF; i++)
{
IntVecTable[i] = MAKELONG(Offset, BiosSegment);
BiosCode[Offset++] = 0xFA; // cli
BiosCode[Offset++] = 0x6A; // push i
BiosCode[Offset++] = (UCHAR)i;
BiosCode[Offset++] = 0x6A; // push 0
BiosCode[Offset++] = 0x00;
BopSeqOffset = CommonStub - (Offset + 3);
BiosCode[Offset++] = 0xE9; // jmp near BOP_SEQ
BiosCode[Offset++] = LOBYTE(BopSeqOffset);
BiosCode[Offset++] = HIBYTE(BopSeqOffset);
}
}
VOID WINAPI RegisterInt32(BYTE IntNumber, EMULATOR_INT32_PROC IntHandler)

3
subsystems/ntvdm/int32.h
View file

@ -18,6 +18,9 @@
/* 32-bit Interrupt Identifiers */
#define EMULATOR_MAX_INT32_NUM 0xFF + 1
#define INT_HANDLER_OFFSET 0x1000
#define COMMON_STUB_OFFSET 0x2000
/* FUNCTIONS ******************************************************************/
typedef VOID (WINAPI *EMULATOR_INT32_PROC)(LPWORD Stack);