????? 10

1
?????? ?????

• ????? 10 ????? ?????

2
?? ???????

• ????? ??????

3
????? ??????

• ?????
• ????? ?????? ???? ?????? (boot, ?? ???? ?-XINU)
• ????? ???? ???????
• ???? ???? ?? ???? - ????????? ??????? ??? ??????
  ????? ??????? ????? ???? ??????? ??????!
• ??? ?????? ???? ???????? main ??????? ???? ??????
  ????, ?????? ?? ?????? ?????? ?????? ???????

4
????? ???? ??????

• ????? ????? ???? ??????? ???? ??????
• ????? ?????? ???????, ?????, ???????
• ????? ???? ?????? ?? ????
• ???' (??? ??? ?????)
• ??????? ?? ??????, ???? ????? ???? ???????

5
???? ???? ????

• ??? ????? ??? ????? ??? ?????? ????? ??
• ?????
• ???? ???? ????? ????? ?????? ???? ????? NULL ????
  
• ????? ?????? ?????, butler ?-xmain (????? command
  line)

6
initialize.c
7
initialize.c
8
initialize.c
9
???????? main

• ????? ??????? ?? ????? ?????? ????? ?-Sysinit
  ?????? ?? ?????? ?????.
• ????? ????? ?? ?????? main ???? ?????? ?-NULL
  ???? ?????? Sysinit. ?????, ?? ????? ?-Sysinit,
  ????? ?-NULL ??? ????? ?? ????. ???? ?? ???????
  ?????? ??? ?????? ??????? ??????.

10
???????? main - ????

• ???? ?????? ?????, main ?????? ??????, ????? ??
  ????? ?-Butler ?????? ?-create ?? ??? ??????
  ????? ????? ?? ??? ????????? - Xmain.
• ???? ??? ??????? ?-main ?????? ???????? ?? ?????
  ?-NULL (????? ????????). ???? ??, ???? ?????
  ????? ?-Xmain ?? ?????? ????? ???? ??? ?? ?-NULL,
  ???? ?? main ????? ?????? ?? ???? ???? ????? ????
  ?? ?????? ????? ?-0 ???? ?-ready.

11
main - initialize.c
12
main - initialize.c
13
??????? Sysinit ????? ????? memlist

• ????? ???? ?? ?????? ???? ????? ???????? malloc
  ????? ???? ??????? ????? ????? ??????. ????? ??
  ????? ?????? ????? ??? ??? ????? ?????? malloc
  ?????? ?? ??? ???????? ?????? ?? C.
• ????? ??????? end ?- maxaddr ??? ????? ?????? ??
  4.

14
??????? Sysinit ????

• ????? ???? ?????? ?? XINU
• ????? ???? ??? ???? ?????? NULL. ???? ???????
  ???? ?-state ?? ?????? ?-PECURR ???????? ?????
  ?????? currpid, resched ????? ??????.
• ????? ???? intmap

15
sysinit
16
sysinit
17
sysinit
18
sysinit
19
sysinit
20
????? ????? ???? ???????
21
???' mapinit - ?????????

• ??????? ?????
• ????? ????? ?? ??? ?????? (LSB) ?-iflag (MSB).
  ?????, ?????? ?- iflag??? ??? ???? ?? ?-isr
  ?????.
• ????? newisr
• Minor device number (????? ????? ?????? ??????).

22
mapinit ????? ??????

• ????? ????? ?- intmap
• Oldisr segmentoffset ???? ??? ?????? (????????
  ??????).
• Call intcom ????? ????? IV ????? ?????? ?????
  ???? ?????? (vec) ????? ?- segmenoffset ??
  oldisr.

23
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24
xdone()

• ???? ???? XINU ????? ?"? ????? xdone
• ?????? ????? ????? ????? ????? ???/???, ?????
  ????? ??????? ????? ???? ????? XINU, ?????? ?????
  ???? ??????? ???? ?MS-DOS-

25
xdone.c
26
maprestore ????? ?-IV

• ????? ?????? ?? oldisr ????? ?????? ?-IV.
• ??? ??, ????? ?? ?? ??????? ?-XINU ?????? ?????
  ?????, ???? ?-ivec ???? ????? ?????? ?-IV ?????
  ?? ?? oldisr.

27
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