Intel 386 User Manual page 656

Table E-1. Instruction Set Summary (Sheet 18 of 19)
Instruction
PREFIX BYTES
Address size prefix 0 1 1 0 0 1 1 1
LOCK = Bus lock prefix 1 1 1 1 0 0 0 0
Operand size prefix 0 1 1 0 0 1 1 0
Segment override prefix
CS: 0 0 1 0 1 1 1 0
DS: 0 0 1 1 1 1 1 0
ES: 0 0 1 0 0 1 1 0
FS: 0 1 1 0 0 1 0 0
GS: 0 1 1 0 0 1 0 1
SS: 0 0 1 1 0 1 1 0
PROTECTION CONTROL
ARPL = adjust requested privilege level
from register/memory 0 1 1 0 0 0 1 1
LAR = load access rights
from register/memory 0 0 0 0 1 1 1 1
LGDT = load global descriptor
table register 0 0 0 0 1 1 1 1
LIDT = load interrupt descriptor
table register 0 0 0 0 1 1 1 1
LLDT = load local descriptor
table register to
0 0 0 0 1 1 1 1
register/memory
LMSW = load machine status word
from register/memory 0 0 0 0 1 1 1 1
LSL = load segment limit
from register memory 0 0 0 0 1 1 1 1
Byte-Granular limit
Page-Granular limit
LTR = load task register
from register/memory 0 0 0 0 1 1 1 1
SGDT = store global descriptor
table register 0 0 0 0 1 1 1 1
SIDT = store interrupt descriptor
Format
mod reg r/m
0 0 0 0 0 0 1 0 mod reg r/m
0 0 0 0 0 0 0 1 mod 0 1 0 r/m
0 0 0 0 0 0 0 1 mod 0 1 1 r/m
0 0 0 0 0 0 0 0 mod 0 1 0 r/m
0 0 0 0 0 0 0 1 mod 1 1 0 r/m
0 0 0 0 0 0 1 1 mod reg r/m
0 0 0 0 0 0 0 0 mod 0 0 1 r/m
0 0 0 0 0 0 0 1 mod 0 0 0 r/m
INSTRUCTION SET SUMMARY
Clock Count Notes
Real Pro- Real
Ad- tected Ad-
dress Virtual dress
Mode Ad- Mode
or dress or
Virtual Mode Virtual
8086 8086
Mode Mode
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
N/A 20/21** a
N/A 15/16* a
11* 11* b, c
11* 11* b, c
N/A 20/24* a
10/13 10/13* b, c
N/A 20/21* a
N/A 25/26* a
N/A 23/27* a
9* 9* b, c
Pro-
tected
Virtual
Ad-
dress
Mode
m
h
g, h, j, p
h, l
h, l
g, h, j, l
h, l
g, h, j, p
g, h, j, p
g, h, j, l
h
E-19