Porting MINIX to Xen - Choices Object-Oriented Operating System
Estudo do MINIX: Parte 2
description
Transcript of Estudo do MINIX: Parte 2
![Page 1: Estudo do MINIX: Parte 2](https://reader036.fdocuments.in/reader036/viewer/2022062304/56813a27550346895da20ab5/html5/thumbnails/1.jpg)
Estudo do MINIX: Parte 2PCS-2042 –Sistemas Operacionais – 2ª etapa do projeto
Erick Butler Poletto Felipe Giunte Yoshida Gabriel Iseppe Porto Geovandro Carlos C. F. PereiraGabriel Augusto de ResendeHugo Pessoa de Barauna
![Page 2: Estudo do MINIX: Parte 2](https://reader036.fdocuments.in/reader036/viewer/2022062304/56813a27550346895da20ab5/html5/thumbnails/2.jpg)
Pergunta 1:Sistem
as Operacionais
Como funciona o mknod? O que é major number e minor number ao se criar um driver?
![Page 3: Estudo do MINIX: Parte 2](https://reader036.fdocuments.in/reader036/viewer/2022062304/56813a27550346895da20ab5/html5/thumbnails/3.jpg)
mknodSistem
as Operacionais
Função:
•Criar novos arquivos especiais (arquivos que representam dispositivos)
Arquivos especiais:
•de Caractere
•de Bloco
![Page 4: Estudo do MINIX: Parte 2](https://reader036.fdocuments.in/reader036/viewer/2022062304/56813a27550346895da20ab5/html5/thumbnails/4.jpg)
mknodSistem
as Operacionais
Uso: mknod /dev/lpx c 18 0
![Page 5: Estudo do MINIX: Parte 2](https://reader036.fdocuments.in/reader036/viewer/2022062304/56813a27550346895da20ab5/html5/thumbnails/5.jpg)
Major e Minor numberSistem
as Operacionais
Major Number
• Identifica driver
• Index da tabela de dispotivos
Minor Number
•Distinguir diferentes dispositivos que usam mesmo driver
![Page 6: Estudo do MINIX: Parte 2](https://reader036.fdocuments.in/reader036/viewer/2022062304/56813a27550346895da20ab5/html5/thumbnails/6.jpg)
Major e Minor numberSistem
as Operacionais
/usr/src/servers/fs/dmap.c
![Page 7: Estudo do MINIX: Parte 2](https://reader036.fdocuments.in/reader036/viewer/2022062304/56813a27550346895da20ab5/html5/thumbnails/7.jpg)
Major e Minor numberSistem
as Operacionais
![Page 8: Estudo do MINIX: Parte 2](https://reader036.fdocuments.in/reader036/viewer/2022062304/56813a27550346895da20ab5/html5/thumbnails/8.jpg)
Como mknod funciona?Sistem
as Operacionais
![Page 9: Estudo do MINIX: Parte 2](https://reader036.fdocuments.in/reader036/viewer/2022062304/56813a27550346895da20ab5/html5/thumbnails/9.jpg)
Pergunta 2:Sistem
as Operacionais
Crie /dev/lpx com um major number diferente de /dev/lp.
Recompile o driver da porta paralela para que ele fique associado ao major number dado por /dev/lpx.
![Page 10: Estudo do MINIX: Parte 2](https://reader036.fdocuments.in/reader036/viewer/2022062304/56813a27550346895da20ab5/html5/thumbnails/10.jpg)
Criando /dev/lpx:Sistem
as Operacionais
mknod /dev/lpx c 18 0
![Page 11: Estudo do MINIX: Parte 2](https://reader036.fdocuments.in/reader036/viewer/2022062304/56813a27550346895da20ab5/html5/thumbnails/11.jpg)
Qual abordagem?Sistem
as Operacionais
Encotramos duas abordagens:
1.Hard Code
2.On the fly
![Page 12: Estudo do MINIX: Parte 2](https://reader036.fdocuments.in/reader036/viewer/2022062304/56813a27550346895da20ab5/html5/thumbnails/12.jpg)
Hard CodeSistem
as Operacionais
Associar driver e dipositivo no boot,
COMO?
![Page 13: Estudo do MINIX: Parte 2](https://reader036.fdocuments.in/reader036/viewer/2022062304/56813a27550346895da20ab5/html5/thumbnails/13.jpg)
Hard Code: caminho das pedras 1Sistem
as Operacionais
1.Adicionar o dipositivo na tabela de dispositivos
2.Colocar o driver na tabela de processos inicializados no boot (/usr/src/kernel/table.c)
3.Como associar o drive carregado com o dipositivo?
ROTINA map_driver(major, proc_nr, style), do arquivo /usr/src/servers/fs/dmap.c
![Page 14: Estudo do MINIX: Parte 2](https://reader036.fdocuments.in/reader036/viewer/2022062304/56813a27550346895da20ab5/html5/thumbnails/14.jpg)
Hard Code: caminho das pedras 2Sistem
as Operacionais
1.Adicionar o dipositivo na tabela de dispositivos
2.Mudar o arquivo /etc/rc ou o /usr/src/servers/init/init.c?
![Page 15: Estudo do MINIX: Parte 2](https://reader036.fdocuments.in/reader036/viewer/2022062304/56813a27550346895da20ab5/html5/thumbnails/15.jpg)
On the flySistem
as Operacionais
1.service up /usr/sbin/printer – dev /dev/lpx
2.Não tem outro passo, é só isso!!!
![Page 16: Estudo do MINIX: Parte 2](https://reader036.fdocuments.in/reader036/viewer/2022062304/56813a27550346895da20ab5/html5/thumbnails/16.jpg)
Como funciona o service up?Sistem
as Operacionais
Service:
Utilitário que prove interface com o RS
(Reincarnation Server)
![Page 17: Estudo do MINIX: Parte 2](https://reader036.fdocuments.in/reader036/viewer/2022062304/56813a27550346895da20ab5/html5/thumbnails/17.jpg)
Reincarnation Server (RS)Sistem
as Operacionais
Função: Transformar ordinary user
processes em system processes
![Page 18: Estudo do MINIX: Parte 2](https://reader036.fdocuments.in/reader036/viewer/2022062304/56813a27550346895da20ab5/html5/thumbnails/18.jpg)
Como funciona service up?Sistem
as Operacionais
![Page 19: Estudo do MINIX: Parte 2](https://reader036.fdocuments.in/reader036/viewer/2022062304/56813a27550346895da20ab5/html5/thumbnails/19.jpg)
Teste finalSistem
as Operacionais
1. mknod lpx c 18 0
2. service up /usr/sbin/printer -dev /dev/lpx
3. echo HUGOBARAUNA > /dev/lpx
![Page 20: Estudo do MINIX: Parte 2](https://reader036.fdocuments.in/reader036/viewer/2022062304/56813a27550346895da20ab5/html5/thumbnails/20.jpg)
Teste finalSistem
as Operacionais
![Page 21: Estudo do MINIX: Parte 2](https://reader036.fdocuments.in/reader036/viewer/2022062304/56813a27550346895da20ab5/html5/thumbnails/21.jpg)
Teste finalSistem
as Operacionais
![Page 22: Estudo do MINIX: Parte 2](https://reader036.fdocuments.in/reader036/viewer/2022062304/56813a27550346895da20ab5/html5/thumbnails/22.jpg)
Sistemas O
peracionaisHack it!