inter
THE
80286
INSTRUCTION SET
If
ES
or
OS
is
loaded with non-null selector:
AR
byte must indicate data or readable code segment else
#GP
(selector)
If data
or
non-conforming code, then both the RPL and the
CPL must be less than
or
equal to
OPL
in
AR
byte else
#GP
(selector)
Segment must be marked PRESENT else
#NP
(selector)
Load segment register with selector
Load segment register cache with descriptor
If
ES
or
OS
is
loaded with a null selector:
Load segment register with selector
Clear valid bit
in
cache
PROTECTED MODE EXCEPTIONS
If
a segment register
is
being loaded, #GP, #SS, and
#NP,
as described
in
the listing above.
Otherwise, #SS(O) if the current top of stack
is
not within the stack segment.
#GP(O) if the destination
is
in
a non-writable segment. #GP(O) for an illegal memory operand effective
address
in
the
CS,
DS, or
ES
segments; #SS(O) for an illegal address
in
the
SS
segment.
REAL ADDRESS MODE EXCEPTIONS
Interrupt
13
for a word operand at offset OFFFFH.
8-84
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