Page 81 - slides.dvi

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•
–
–
–
–
I/O
–
–
–
Operating
OS
I/O
I/O
Systems
polled
deals
event
Programs
—
processor
terminal
windows
I/O
with
versus
hardware
not
access
stream
Subsystem
instructions
Subsystem
streams
not
type
Priv
H/W
interrupt
Unpriv
frame
virtual
not
interrupt
raw
versus
(e.g.
Driver
Device
Keyboard
buffer
processor–device
10’s
driven
devices:
mouse
mechanism
I/O Buffering
Driver
Device
memory
of
HardDisk
terminals
serial
interface:
Application-I/O Interface
mapped
Driver
I/O Scheduling
Device
Network
–
–
–
chips)
files
printer
not
transport
Device Layer
disk
Device Driver Layer
Virtual Device Layer
spooler
Common I/O Functions
not
protocols
blocks
not
parallel
raw
port
77
ethernet