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<TITLE>Int 67/AX=DE0Ch
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Int 67/AX=DE0Ch - Virtual Control Program Interface - SWITCH TO PROTECTED MODE -
AX = DE0Ch
ESI = linear address in first megabyte of values for system
registers (see #03665)
interrupts disabled
Return: interrupts disabled
GDTR, IDTR, LDTR, TR loaded
SS:ESP must have at least 16 bytes space, and the entry point is
required to set up a new stack before enabling interrupts
EAX, ESI, DS, ES, FS, GS destroyed
Note: in protected mode, calling the protected-mode VCPI entry point with
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<h2>Int 67/AX=DE0Ch
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<h3><font color=#C00040>Virtual Control Program Interface - SWITCH TO PROTECTED MODE</font></h3>
<PRE>
AX = DE0Ch
ESI = linear address in first megabyte of values for system
registers <a href="rb-7503.htm#Table3665" tppabs="http://www.ctyme.com/intr/rb-7503.htm#Table3665">(see #03665)</a>
interrupts disabled<br>
<p><b>Return:</b><br>Interrupts disabled
GDTR, IDTR, LDTR, TR loaded
SS:ESP must have at least 16 bytes space, and the entry point is
required to set up a new stack before enabling interrupts
EAX, ESI, DS, ES, FS, GS destroyed
</PRE>
<p><b>Note:</b>
In protected mode, calling the protected-mode VCPI entry point with
AX = DE0Ch
DS = segment selector mapping entire linear address space obtained
via AX=DE01h
SS:ESP in first megabyte of linear memory
STACK:QWORD return address from FAR call to 32-bit segment
DWORD EIP
DWORD CS
DWORD reserved for EFLAGS
DWORD ESP
DWORD SS
DWORD ES
DWORD DS
DWORD FS
DWORD GS
and interrupts disabled, will switch to virtual86 mode with
interrupts disabled, all segment registers loaded, and EAX
destroyed.
<p><b>See Also:</b>
<a href="rb-7414.htm" tppabs="http://www.ctyme.com/intr/rb-7414.htm">AH=3Fh</a> - <a href="rb-1531.htm" tppabs="http://www.ctyme.com/intr/rb-1531.htm">INT 15/AH=89h</a> - <a href="rb-8440.htm" tppabs="http://www.ctyme.com/intr/rb-8440.htm">INT D4/AH=10h</a>
<PRE>
<p>
Format of system register values for switch to protected mode:
<a name=table3665></a>
Offset Size Description (Table 03665)
00h DWORD value for CR3
04h DWORD linear address in first megabyte of value for GDTR
08h DWORD linear address in first megabyte of value for IDTR
0Ch WORD value for LDTR
0Eh WORD value for TR
10h PWORD CS:EIP of protected mode entry-point
</PRE>
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