MFSH_CALLRM - Put machine in real mode
Put the machine into real mode, call the specified routine, put the
machine back into protect mode, and return.
int far pascal MFSH_CALLRM(plRoutine)
unsigned long far * plRoutine;
plRoutine is a pointer to a double word which contains the VIRTUAL address
of the routine to call.
There are no error returns.
Only registers DS and SI will be preserved between the caller and the
target routine. The selector in DS will be converted to a segment before
calling the target routine. Arguments may not be passed on the stack since
a stack switch may occur.
This helper allows the mini-FSD to access the ROM BIOS functions which
typically run in real mode only. Great care must be taken in using this
function since selectors used throughout the system are meaningless in
real mode. While in real mode, no calls to any helpers may be made.
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