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80286
SYSTEM INITIALIZATION
.Iarl
endp
bad_I
••
:
Copy
Ihe
T55
and
LDT
for
Ihe
I
••
k
polnled
01
by
C5:BX.
If
Ihe
la.k
ha.
an
LDT
II
will
01.0
be
copied
down.
BX
and
BP
are
Iran.parenl.
h I I
copy_lo.k.
proc
Hall
here
If
TSS
15
Invalid
mov
mov
mov
mov
I.
I
mov
I a r
1 n z
mov
and
cmp
1 n z
I.
I
cmp
1 b
• I , g d
I_a
I I a •
d.
, • I
• I ,
c.
: I b x I • I
••
_a
Ila.
I!
!!I
, !!Ii
e x I !I 1
• I ,
c.
: I b x I • I •
'_'
e I
d x I
!!I
1
b a
d_
15.
d I , d h
dh,nol
DPL
dh,T55_ACCE55
b a
d_
I
••
C X I
!!I
1
c x , T 5
5_5
I Z E - 1
b a
d_
15.
Gel
addre5.ablllly
10
GDT
Gel
.eleclor
for
TSS
alia.
Polnl
ES
al
alia.
dala
.egmenl
Gel
lenglh
of
TSS
alia.
Gel
T55
5eleclor
Gel
alia.
acee5'
rlghl.
Jump
If
Invalid
reference
Save
TSS
de5crlplor
acce5'
byle
Ignore
privilege
See
If
T5S
Jump
If
nol
Gel
lenglh
of
EPROM
ba.ed
TSS
Verify
II
15
of
proper
.Ize
Jump
if
II
15
nol
big
enough
Selup
for
moving
Ihe
EPROM-ba5ed
T55
10
RAM
D5
polnl.
al
GDT
mov
mov
call
[ • I I . a c c e
••
, D
S_A
C C E 5 5
d 5 I 5 1
cop
y_w
I I
h_
f i I I
Make
TSS
Inlo
dala
5egmenl
Polnl
DS
al
EPROM
T5S
Copy
DS
5egmenl
10
ES
wllh
zero
fill
CX
ha5
copy
counl,
AX-CX
fill
counl
5el
Ihe
GDT
T55
Ilmil
and
ba5e
addre55
10
Ihe
RAM
values.
mov
mov
mov
mov
mov
movsIII
mOV!!I1II
lod.w
mov
5 t 0
!!I
\II
movsw
ax,gdl_allas
d
5.
1
a x
e 5 I a x
d i , C
5:
[b
x I •
15
5_S
e I
!I i
,e
5:
[ b
x]
. t 5
:i_a
1 i c s
a h , d I
A-6
Reslore
GDT
addres51ng
Gel
TSS
5eleclor
G'et
RAM
alia.
5eleclor
Copy
llmi
I
Copylow
16
bi15
of
addre55
Gel
high
8
bil5
of
address
Mark
a5
TSS
de5crlplor
Fill
In
high
addre5s
and
access
byle5
Copy
reserved
word