Page 14 - slides.dvi
P. 14
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–
–
In
Operating
Only
Access
main
Systems
Typically
reality,
Hardware
—
allow
out
(covered
of
more
Structures
later
disable
schemes
checks
&
update
on
range
are
of
in
every
Protection
⇒
complex
CPU
Protection
memory
base
vector
course)
and
memory
Mechanisms
into
segmentation
protection
limit
protection
Hardware
no
in
and
h/w
yes
reference.
operating
registers
kernel
used:
paging
in
no
vector to OS (address error)
base+limit
mode
system
yes
kernel
(just
Memory base Memory
as
mode.
(although
a
for
an
bad
idea).
interrupt).
10
