Mail Archives: djgpp/1997/10/13/09:23:51
On Sun, 12 Oct 1997, Gurunandan R. Bhat wrote:
> Isn't it the _stub_ that does the rm -> pm switch. I always thought that
> the DPMI host makes DPMI services available via INT 31H in much the way
> that DOS makes DOS services available via INT 21H.
It's both, actually. The DPMI host provides a function to switch the
CPU into protected mode. The stub *calls* this function to do the
switch. The DPMI host then actually switches the CPU into PM by using
whatever low-level support it has available (VCPI, XMS, etc.) from
installed memory manager (EMM386, QEMM, HIMEM...).
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