gaos's Introduction

UCAS_OS lab - GAOS

How to run

Prerequisites

Have riscv cross compiler and qemu, or with Xilinx develop board.

foo way

Directly run ./run_qemu.sh, input password, and you will see bootloader.

Then input loadboot, and enter the only kernel 0, and you can see three tasks seem to be run at the same time, while two others are run alternatively.

DIY task

You shall modify into test/ file folder, head files, and include/tasks.h

the head in original init/main.c (running 2 tasks) is like:

#define USE_CLOCK_INT
// #define INIT_WITH_PRIORITY

you can delete the comment mark to run different tasks.

and as you can see, there are other options:

use clock int, this will open clock interrupt to schedule tasks preemptly, as a normal mature kernel.

#define USE_CLOCK_INT

init tasks with priority, this will automatically initialize tasks with increasing priority, and you can see the results obviously.

#define INIT_WITH_PRIORITY

and back to terminal, run:

> make clean

> make

> ./run_qemu.sh

> loadboot

> 0

Report

lab report is in report.md or report.pdf

Completion

final score: 91

Project	Core	Function
1 - bootloader	C	load large kernel from SD multiple OS kernel start
2 - simple kernel	C	time interrupt/preempt process schedule syscall and exception handler fork process mutex lock priority scheduling
3 - complex kernel	C	implement a simple shell barrier, semaphore and mailbox dual-core start taskset (process bind cpu)
4 - virtual memory	A	virtual memory isolation page fault error handling swap page between memory and SD thread
5 - device driver	C-	web card interrupt send and recv packages listen on multi-port
6 - file system	A-	command: touch, cat, open read, write, close, ln ls, rm, lseek