My OSDI 2020

Author

學號	GitHub 帳號	姓名	Email
`0856168`	`ex7763`	`許博鈞`	hpc.cs08g@nctu.edu.tw

Question

Lab 0

Q: What's the RAM size of Raspberry Pi 3B+? A: 1GB SRAM

Q: What's the cache size and level of Raspberry Pi 3B+? A: CPU: ARM Cortex-A53 Cache: L1 Cache: 32kB L2 Cache: 512kB Reference: https://www.terraelectronica.ru/pdf/show?pdf_file=%252Fds%252Fpdf%252FT%252FTechicRP3.pdf

Lab 1

Q: Is it reasonable to accelerate booting speed by parallel programming during the initialization stage? A:

Q: Point out the difference between bare-metal programming and programming on top of operating system. A: 需要系統幫忙的library就不能使用，像是malloc等分配記憶體空間的函數，或是fork等

Lab 2

Q1: In x86 machine, how the above 4 steps are implemented? Roughly describe it. A1:

Q2: Calculate how long will it take for loading a 10MB kernel image by UART if baud rate is 115200? A2: 7281.77s baud rate 115200 = 115200 bit/s = 14400 byte/s 10 MB = 10 * 1024 * 1024 byte 10 MB / 1440 byte = 10 * 1024 * 1024 / 1440 = 7281.777

Lab 8

question 2 How to implement a component cache mechanism if a file has multiple names (because of hard links)

How to build

make

How to run

make run

How to burn it into pi3

make You can get kernel8.img, then copy to your sd card.

Architecture

OS

Standard Library

system.h math.h string.h

Driver

gpio.h uart.h

Shell

pcsh.h

Main

main.c

Script

script.py test_cmd.txt

Directory structure

WIP

ex7763/osdi2020