[부스트캠프 웹・모바일 7기 Tech Talk] 발표자 : 임현택 캠퍼

1. ⓒ NAVER Connect Foundation
OS 그냥 재미로
- OS 개발과 보통 개발의 차이 -
2022.10.20
작성자 : 임현택

2. ⓒ NAVER Connect Foundation
- 부팅
- 메모리
- 프로세스
- 화면출력

3. ⓒ NAVER Connect Foundation 3
영화 her https://www.youtube.com/watch?v=NHA69lCd1ZM

4. ⓒ NAVER Connect Foundation
그냥 재미로
Q:운영체제개발해서어디쓰나요?
A:쓸모없어요
Q:???

5. ⓒ NAVER Connect Foundation 5
http://www.yes24.com/Product/Goods/197293

6. ⓒ NAVER Connect Foundation 6
https://ko.wikipedia.org/wiki/리처드_파인만
https://ko.wikiquote.org/wiki/리처드_파인만
내가 만들어낼 수 없다면,
난 그것을 이해하지 못한 것이다.

7. ⓒ NAVER Connect Foundation 7
Q : OS는 어떻게 만드나요?
알고리즘말고!

8. ⓒ NAVER Connect Foundation 8
bootloader, OS
binary(컴파일결과)

9. ⓒ NAVER Connect Foundation 9
01000010 01001101 01110010 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00110110 00000000 00000000 00000000 00101000 00000000
00000000 00000000 00000110 00000000 00000000 00000000 00000011 00000000
00000000 00000000 00000001 00000000 00011000 00000000 00000000 00000000
00000000 00000000 00111100 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00001010 01101001
01101110 01110100 00000000 01101101 01100001 01101001 01101110 00101000
00101001 01111011 00001010 00000000 00000000 00000000 00000000 01110000
00000000 00000000 01110010 01101001 01101110 01110100 01100110 00101000
00100010 01100010 01101111 01101111 01110011 01110100 01100011 01100001
01101101 01110000 00100010 00101001 00000000 00000000 00111011 00001010
00000000 00000000 00000000 00000000 01110010 01100101 01110100 01110101
01110010 01101110 00000000 00110000 00111011 00001010 01111101 00000000
00000000 00000000

10. ⓒ NAVER Connect Foundation 10
int main(){
printf("boostcamp");
return 0;
}

11. ⓒ NAVER Connect Foundation
Bootstrapping
더블클릭

12. ⓒ NAVER Connect Foundation 12
RAM
0x00000
0xFFFF
F
HDD
bootloader
OS

13. ⓒ NAVER Connect Foundation 13
OS
bootloader
RAM
0x00000
0xFFFF
F
0x07C00
0x07DFF
HDD
bootloader
OS

14. ⓒ NAVER Connect Foundation 14
OS
bootloader
RAM
0x00000
0xFFFF
F
0x07C00
0x07DFF
HDD
bootloader
OS

15. ⓒ NAVER Connect Foundation 15
https://en.wikipedia.org/wiki/GNU_GRUB

16. ⓒ NAVER Connect Foundation 16
하드디스크 1섹터(512byte) 읽기
CPU register 설정
AH = 0x02
AL = 0x01
CH = 0x00
CL = 0x02
…
인터럽트 실행
INT 0x13

17. ⓒ NAVER Connect Foundation
OS의 메모리 관리
new,malloc

18. ⓒ NAVER Connect Foundation 18
RAM Info
RAM
0xC0000
Mem mem = (*Mem) 0xC0000

19. ⓒ NAVER Connect Foundation
프로세스 스케줄링
타이머

20. ⓒ NAVER Connect Foundation 20
타이머 인터럽트
주기적으로인터럽트를발생시키는CPU이외의칩

21. ⓒ NAVER Connect Foundation 21
HLT : CPU 사용률 100% ?
인터럽트를대기하는명령HLT

22. ⓒ NAVER Connect Foundation
화면 출력
printf?

23. ⓒ NAVER Connect Foundation 23
display(screen) ?
모니터프레임마다매번출력해야하는가?

24. ⓒ NAVER Connect Foundation 24
RAM
0xA0000
0xAFFFF
int i;
char *p;
for(i=0xa0000; i<=0xaffff; i++){
p = (char*) i;
*p = 0x0f;
}
VRAM

25. ⓒ NAVER Connect Foundation 25
00000000
00011000
00011000
00011000
00100100
00100100
00100100
00100100
01111110
01000010
01000010
01000010
11100111
00000000
00000000
A

26. ⓒ NAVER Connect Foundation 26
https://windowsforum.kr/free/1934314

27. ⓒ NAVER Connect Foundation 27
http://www.yes24.com/Product/Goods/2508562

28. ⓒ NAVER Connect Foundation
End of Document
Thank You.