AA-64 architecture
task state segment




 
64bit TSS
 
offset 3
1
3
0
2
9
2
8
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
1
9
1
8
1
7
1
6
1
5
1
4
1
3
1
2
1
1
1
0
9 8 7 6 5 4 3 2 1 0
+00h reserved reserved
+04h RSP0
+08h
+0Ch RSP1
+10h
+14h RSP2
+18h
+1Ch reserved
+20h reserved
+24h IST_RSP1
+28h
+2Ch IST_RSP2
+30h
+34h IST_RSP3
+38h
+3Ch IST_RSP4
+40h
+44h IST_RSP5
+48h
+4Ch IST_RSP6
+50h
+54h IST_RSP7
+58h
+5Ch reserved reserved
+60h reserved reserved
+64h IOPB offset reserved T
+68h  
optional operating system data
 
+IOPB  
optional I/O permission bitmap
 
  x x x x x 1 1 1



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