Page 51 - slides.dvi

•
•
•
•
–
–
–
–
–
–
–
⇒
Operating
or
OS
OS
use
Different
one
can
fine
only
a
Systems
if
Simplest
can
Structure
Problem:
Problem:
—
one
keep
loads
kinds
the
Alternatively
use
of
a
register
case:
Paging
of
switches
the
page
need
page
keep
set
per
the
to
more
page
register
translation
this
of
tables
page
table
page
refer
hardware
table
registers
when
is
Page
to
needed
complex
on
might
lookaside
table
in
dedicated
length
in
small.
support
still
.
Table
.
switching
memory
buffer
context
MMU
be
can
structure
but
register
be
memory
very
twice
relocation
(see
(page
(TLB)
switch
process
what
for
big.
if
table
later)
(PTLR)
provided:
registers
every
to
have
base
large
‘actual’
indicate
register
size
number
of
memory
of
(PTBR))
page
pages
?
reference.
table.
.
.
47