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<TITLE>Int 31/AX=0300h
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Int 31/AX=0300h - DPMI 0.9+ - SIMULATE REAL MODE INTERRUPT -
AX = 0300h
BL = interrupt number
BH = flags
bit 0: reset the interrupt controller and A20 line (DPMI 0.9)
reserved, must be 0 (DPMI 1.0+)
others: reserved, must be 0
CX = number of words to copy from protected mode to real mode stack
ES:(E)DI = selector:offset of real mode call structure (see #03148)
Return: CF clear if successful
real mode call structure modified (all fields except SS:SP, CS:IP
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<h2>Int 31/AX=0300h
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<h3><font color=#C00040>DPMI 0.9+ - SIMULATE REAL MODE INTERRUPT</font></h3>
<PRE>
AX = 0300h
BL = interrupt number
BH = flags
<p><b>bit 0:</b><br>Reset the interrupt controller and A20 line (DPMI 0.9)
reserved, must be 0 (DPMI 1.0+)
<p><b>others:</b><br>Reserved, must be 0.
CX = number of words to copy from protected mode to real mode stack.
ES:(E)DI = selector:offset of real mode call structure <a href="rb-5831.htm#Table3148" tppabs="http://www.ctyme.com/intr/rb-5831.htm#Table3148">(see #03148)</a><br>
<p><b>Return:</b><br>CF clear if successful
real mode call structure modified (all fields except SS:SP, CS:IP
filled with return values from real mode interrupt)
CF set on error
AX = error code (DPMI 1.0+) (8012h,8013h,8014h,8021h)<a href="rb-5802.htm#Table3143" tppabs="http://www.ctyme.com/intr/rb-5802.htm#Table3143">(see #03143)</a>
protected mode stack unchanged
</PRE>
<p><b>Notes:</b>
16-bit programs use ES:DI as pointer, 32-bit programs use ES:EDI.
CS:IP in the real mode call structure is ignored for this call,
instead, the indicated interrupt vector is used for the address.
The flags in the call structure are pushed on the real mode stack to
form an interrupt stack frame, and the trace and interrupt flags are
clear on entry to the handler.
DPMI will provide a small (30 words) real mode stack if SS:SP is zero.
The real mode handler must return with the stack in the same state as
it was on being called
<p><b>See Also:</b>
<a href="rb-5833.htm" tppabs="http://www.ctyme.com/intr/rb-5833.htm">AX=0302h</a> - <a href="rb-5892.htm" tppabs="http://www.ctyme.com/intr/rb-5892.htm">AX=FF01h</a> - <a href="rb-2619.htm" tppabs="http://www.ctyme.com/intr/rb-2619.htm">INT 21/AX=2511h</a> - <a href="rb-3435.htm" tppabs="http://www.ctyme.com/intr/rb-3435.htm">INT 21/AH=E3h"OS/286"</a>
<p><b>See Also:</b>
<a href="rb-4197.htm" tppabs="http://www.ctyme.com/intr/rb-4197.htm">INT 2C/AX=0026h</a> - <a href="rb-5732.htm" tppabs="http://www.ctyme.com/intr/rb-5732.htm">INT 2F/AX=FB42h/BX=000Dh</a>
<PRE>
<p>
Format of DPMI real mode call structure:
<a name=table3148></a>
Offset Size Description (Table 03148)
00h DWORD EDI
04h DWORD ESI
08h DWORD EBP
0Ch DWORD reserved (00h)
10h DWORD EBX
14h DWORD EDX
18h DWORD ECX
1Ch DWORD EAX
20h WORD flags
22h WORD ES
24h WORD DS
26h WORD FS
28h WORD GS
2Ah WORD IP
2Ch WORD CS
2Eh WORD SP
30h WORD SS
</PRE>
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