7/30/2019 kernel material

1/7

!" #$$%

&'%("!

while ( 1 ) ;

&

#

#

How ?

)

*%& %

&'+,"-+,-. $&'%%

". %+#"-!

&'!+!-.

kernel user

Exception/Interrupt/Fault

Set user mode

Privileged instructionscan be executed only in kernel mode.

7/30/2019 kernel material

2/7

/

0

!%# &%

!1 2

3

!1

1

4

!1

Reset

IRQ 0

Timer

IRQ 1

7/30/2019 kernel material

3/7

5

1!1

6#1

7

26%# #

'7

#%6)(

#%7

8&..!9$#%$#%7

& 1

:01

!1

*%*#

#

0#+#%-

&'"

"

7/30/2019 kernel material

4/7

;

1

7/30/2019 kernel material

5/7

>

%0"

'1&

7/30/2019 kernel material

6/7

6&

(1#?@

(#

+?@-

!!

)

0&

##

#4$A

7/30/2019 kernel material

7/7

/

&B#%

&

+&-

&

&'

&'#

C#

6#

3#

& #

&B"+&B-$

4

61$

%0!.

!1.

%+!"-0%#.

0%!&'.

0#1.

&