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80286
SYSTEM INITIALIZATION
See
If
a
valid
LOT
I.
'peclfled
for
the
.tartup
ta.k
If.
0 I
hen
cop
Y I h e E
PRO
M ve
..
.1
0 n I n
lot
heR
A M a I I a
•.
mov
mov
and
Jz
pu.h
I a r
J n z
mov
and
cmp
J n e
d •
,c.
:
[b
x J . I
••
_all
a.
.I,d.:word
plr
LOT_OFFSET
.I,nol
TJRPL_MASK
n
a_I
d I
d I
,d
h
dh,nol
DPL
dh,
DT_ACCESS
bad_Idl
Addre
••
TSS
10
get
LOT
Ignore
TI
and
RPL
Skip
Ihl.
If
no
LOT
u.ed
Save
LDT
.eleclor
Te.1
de.crlplor
Jump
If
Invalid
.eleclor
Save
LDT
de.crlplor
acce
••
byle
[gnore
privilege
Be
.ure
II
I.
an
LDT
de.crlptor
Jump
If
Invalid
mov
e.:[.IJ.acce.5,DS_ACCESS;
Mark
LDT
a.
dala
.egmenl
mov
d".1
Polnl
OS
al
EPROM
LOT
151
call
mov
IS
X 1 5 1
Ie.
I_d
t_ll·m
I I
ex
1
IS
X
Gel
LDT
Ilmil
Verify
II
i!.valld
Save
for
later
Examine
Ihe
LDT
alia
••
egment
and,
If
good,
copy
10
RAM
mov
mov
I • I
call
c a I I
• I ,
c.
: I b
x)
. I d
I_alia
5
e!l
,
51
IS
X I !l1
le.l_dl_Ilmll
cop
y_w
I I
h_
f I I I
Gel
Idl
all
•••
eleelor
Polnl
ES
al
alia
••
egmenl
Get
I~nglhof
alla~
segment
Verify
II
I.
valid
Copy
LDT
Inlo
RAM
alia
••
egmenl
Sel
Ihe
LDT
Ilmil
and
ba.e
addre
••
10
Ihe
RAM
copy
of
Ihe
LOT
.
mov
pop
mov
mov
mov
mov!w
mov!iW
10
d • w
mov
•
Io.w
mov!lw
ret
bad_Idt:
hit
• I
,c
• : [ b x I . I d I
_a
I I
••
d I
ax.gdl_alla.
d!i
1
I!I
X
e!l
1
1<
X
a h , d I
endp
A-7
Re.lore
LDT
alia
••
eleelor
Re.lore
LDT
.eleclor
Re.lore
GDT
addre
••
lng
Move
Ihe
RAM
LDT
Ilmil
Move
Ihe
low
16
bll.
aero
••
Gel
Ihe
high
8
bit.
Mark
a.
LDT
de.erlptor
Sel
high
addre
••
and
aeee
••
rlghl
•
Copy
re.erved
word
All
done
Hall
here
If
LDT
I.
Invalid