1. Tutorial 7
MODULE 6

2. Q1
The starting address of a read only valid Non-system data segment in is C30000H
Size is 24KB,
Highest Privilege Level,
Has been accessed before
And addresses have to be incremented to read consecutive data (i.e. address expands upwards)
What will be the 8-byte descriptor? (Write from MSB onwards)
10,01,00

3. Q2
If the 8byte descriptor of a segment in is FF FF
What is the size of the segment?
Is this a code or data segment?
Is this segment Read only/execute only , Read or Write?
Has this segment been accessed before?
What is the starting address of the segment?
What is the minimum RPL required to access this segment?
256 bytes
Code
Read
Yes 11

4. Q3 Paging is enabled CR3 = 70 00 00 00H
Linear address generated is AC H.
What will be the address in the Paging Directory that will you look for in order to get the starting address of the paging table?
16KB = 4kx4

5. Question
Processor
GDTR – H

6. GDT
Address
Data
100008 00 82 01 FF
100010 20
100018 83 03 3F
100020 FC 0A 1F
100028 DF B0
100030 92 B1 0F
100038 F1 7B
100040 D2 7A 07
100048 9F A1
100050 C4 A3 7F
100058
100060 B3 50

7. LDT1
Address
Data
010000 00 82 01 FF
010008 20
010010 83 03 3F
010018 FC 0A 1F
010020 DF B0
010028 92 B1 0F
010030 B2 7B
010038 D2 7A 07
010040 9F A1
010048 B3 A3
010050
010058 50

8. LDT2
Address
Data
200000 00 82 01 FF
200008 20
200010 83 03 3F
200018 FC 0A 1F
200020 DF B0
200028 92 B1 0F
200030 B2 7B
200038 D2 7A 07
200040 A1
200048 B3 A3
200050
200058 50

9. Question 4 DS = 003AH INST – MOV AX,[0200H] Physical Address
Type of Segment, Protection Level etc.

10. Question 5 DS = 0045H LDTR – 00108H MOV BX,[1234H] Physical Address
Type of Segment, Protection Level etc.

11. Processor
CR3 FF
Paging Enabled

12. GDT
Address
Data 00 D0 82 01 FF 20 04 Do 83 03 3F FC 0A 1F DF B0 92 B1 0F B2 7B D2 7A 07 9F A1 B3 A3 30 50

13. Question 6 DS = 0050H INST – MOV EAX,[00 00 70 34] Physical Address
Type of Segment, Protection Level etc.

14. PD Address Data FF000000 01 00 FF000004 02 FF000008 03 FF00000C 0405
FF000014 06
FF000018 08
FF00001C 0A
FF000020 0B
FF000024 0C
FF000028 0E
FF00002C 0F

15. PT
Address
Data
030008C0 10 00
030008C4 11
030008C8 12
030008CC 13
030008D0 14
030008D4 15
030008D8 16
030008DC 1A
030008E0 1B
030008E4 1C
030008E8
030008EC
Address
Data 21 00 22 23 C 24 25 26 28 C 2A 2B 2C 2D C 30
Q4 – physical address = A
Q5- physical address = B
Q6 – linear Address = 00 A
Q3- physical address =