信号量

.gitignore

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+*.o
+*.bin
+*.elf
+

.vscode/settings.json

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+{
+    "files.associations": {
+        "os.h": "c",
+        "stdarg.h": "c",
+        "platform.h": "c",
+        "stddef.h": "c"
+    },
+    "workbench.editor.wrapTabs": true
+}

.vscode/tasks.json

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+{
+    "tasks": [
+        {
+            "type": "cppbuild",
+            "label": "C/C++: aarch64-linux-gnu-gcc 生成活动文件",
+            "command": "/usr/bin/aarch64-linux-gnu-gcc",
+            "args": [
+                "-fdiagnostics-color=always",
+                "-g",
+                "${file}",
+                "-o",
+                "${fileDirname}/${fileBasenameNoExtension}"
+            ],
+            "options": {
+                "cwd": "${fileDirname}"
+            },
+            "problemMatcher": [
+                "$gcc"
+            ],
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            },
+            "detail": "调试器生成的任务。"
+        }
+    ],
+    "version": "2.0.0"
+}

LICENSE

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+BSD 2-Clause License
+
+Copyright (c) 2021, plctlab
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Makefile

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+SECTIONS = \
+	code/asm \
+	code/os \
+
+.DEFAULT_GOAL := all
+all :
+	@echo "begin compile ALL exercises for assembly samples ......................."
+	for dir in $(SECTIONS); do $(MAKE) -C $$dir || exit "$$?"; done
+	@echo "compile ALL exercises finished successfully! ......"
+
+.PHONY : clean
+clean:
+	for dir in $(SECTIONS); do $(MAKE) -C $$dir clean || exit "$$?"; done
+
+.PHONY : slides
+slides:
+	rm -f ./slides/*.pdf
+	soffice --headless --convert-to pdf:writer_pdf_Export --outdir ./slides ./docs/ppts/*.pptx
+

README.md

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+**Step by step, learn to develop an operating system on RISC-V**
+
+<!-- TOC -->
+
+- [1. Introduction](#1-introduction)
+- [2. Operating environment](#2-operating-environment)
+- [3. Building and usage](#3-building-and-usage)
+- [4. References](#4-references)
+
+<!-- /TOC -->
+# 1. Introduction
+
+This course is used to teach and demonstrate how to write a simple operating system kernel for the RISC-V platform from scratch. Released under the BSD 2-Clause license (For details, please read the [LICENSE file](./LICENSE) under the root directory of this repository).
+
+If you have any questions or bug report, please use the issue tracking system on github.
+
+Note: We also have a mirror repository on gitee (<https://gitee.com/unicornx/riscv-operating-system-mooc>), and we use the issue tracking system on gitee more actively than on github, all issue# filled in git commitment are from the issue tracking system of gitee.
+
+# 2. Operating environment
+
+Ubuntu 20.04 is recommended. Ubuntu 20.04 is currently the latest recommended long-term stable release of Ubuntu. It is also the easiest to install and run the environment in this environment.
+
+Some students reported that they hope to still use Ubuntu 18.04. Because the official source of Ubunt 18.04 does not support the RISC-V development kit, so the environment is a little more complicated. I wrote a simple document, and you can refer [here ](./howto-run-with-ubuntu1804.md) to have a try with Ubuntu 18.04.
+
+All demo codes have been verified under the following environment. Please carefully check whether your Ubuntu version and kernel version are consistent with the following information.
+
+```
+$ lsb_release -a
+No LSB modules are available.
+Distributor ID:	Ubuntu
+Description:	Ubuntu 20.04.3 LTS
+Release:	20.04
+Codename:	focal
+
+$ uname -r
+5.11.0-27-generic
+```
+
+At present, in the Ubuntu 20.04 environment, we can directly use the official GNU toolchain and QEMU emulator, and execute the following command to install online to start the test:
+
+```
+$ sudo apt update
+$ sudo apt install build-essential gcc make perl dkms git gcc-riscv64-unknown-elf gdb-multiarch qemu-system-misc
+```
+
+# 3. Building and usage
+
+- `make`：Compile and build
+- `make run`：Start qemu and run
+- `make debug`：Start debugging
+- `make code`：Disassemble to view binary code
+- `make clean`：cleanup
+
+For specific use, please refer to the Makefile under the specific sub-project.
+
+# 4. References
+
+The design of this course refers to the following network resources, thank you :)
+
+- The Adventures of OS：<https://osblog.stephenmarz.com/index.html>
+- mini-riscv-os: <https://github.com/cccriscv/mini-riscv-os>
+- Xv6, a simple Unix-like teaching operating system：<https://pdos.csail.mit.edu/6.828/2020/xv6.html>

README_zh.md

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+**循序渐进，学习开发一个 RISC-V 上的操作系统**
+
+<!-- TOC -->
+
+- [1. 简介](#1-简介)
+- [2. 运行环境](#2-运行环境)
+- [3. 构建和使用说明](#3-构建和使用说明)
+- [4. 参考文献](#4-参考文献)
+
+<!-- /TOC -->
+# 1. 简介
+
+本课程用于教学演示如何从零开始为 RISC-V 平台编写一个简单的操作系统内核。采用 BSD 2-Clause 许可证发布（具体请阅读本仓库根目录下的 [LICENSE 文件](./LICENSE)）。
+
+如果您有任何的问题或者发现任何可疑的 bug，请通过 [Gitee 的 issue 跟踪系统](https://gitee.com/unicornx/riscv-operating-system-mooc/issues) 给我们提出报告，我们将第一时间检查并在系统中回复您。
+
+**本课程的配套教学视频在线播放地址**: <https://www.bilibili.com/video/BV1Q5411w7z5>
+
+欢迎加入本课程的 **学习群**，边学习边讨论：
+
+- **QQ 学习群**，群号 976125506，或者扫码加入，见下：
+
+![](./qq-group.png)
+
+- **微信学习群**，请添加微信 fangzhang1024 （标注 【汪辰老师】）加入。
+
+# 2. 运行环境
+
+推荐使用 Ubuntu 20.04，Ubuntu 20.04 是目前最新的 Ubuntu 长期稳定发行版，在这个环境下安装运行环境也最简单。
+
+有些同学反映希望仍然使用Ubuntu 18.04，因为 Ubunt 18.04 的官方源还不支持 RISC-V 的开发工具包，所以搭建环境稍微复杂一些，我写了一个简单的说明文档，感兴趣的同学可以看 [这里](./howto-run-with-ubuntu1804_zh.md)。
+
+所有演示代码在以下环境下验证通过，请仔细核对你的 Ubuntu 版本和内核版本与以下信息是否一致。
+
+```
+$ lsb_release -a
+No LSB modules are available.
+Distributor ID:	Ubuntu
+Description:	Ubuntu 20.04.3 LTS
+Release:	20.04
+Codename:	focal
+
+$ uname -r
+5.11.0-27-generic
+```
+
+目前在 Ubuntu 20.04 环境下我们可以直接使用官方提供的 GNU工具链和 QEMU 模拟器，执行如下命令在线安装即可开始试验：
+
+```
+$ sudo apt update
+$ sudo apt install build-essential gcc make perl dkms git gcc-riscv64-unknown-elf gdb-multiarch qemu-system-misc
+```
+
+# 3. 构建和使用说明
+
+- `make`：编译构建
+- `make run`：启动 qemu 并运行
+- `make debug`：启动调试
+- `make code`：反汇编查看二进制代码
+- `make clean`：清理
+
+具体使用请参考具体子项目下的 Makefile 文件。
+
+# 4. 参考文献
+
+本课程的设计参考了如下网络资源，在此表示感谢 :)
+
+- The Adventures of OS：<https://osblog.stephenmarz.com/index.html>
+- mini-riscv-os: <https://github.com/cccriscv/mini-riscv-os>
+- Xv6, a simple Unix-like teaching operating system：<https://pdos.csail.mit.edu/6.828/2020/xv6.html>

code/Makefile

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+include common.mk
+
+run:
+	@${QEMU} -M ? | grep virt >/dev/null || exit
+	@echo "Press Ctrl-A and then X to exit QEMU"
+	@echo "------------------------------------"
+	${CC} ${CFLAGS} -o os.elf hello.o
+	${QEMU} ${QFLAGS} -kernel os.elf
+
+ubunturun:
+	gcc -c hello.c -o hello.o
+
+
+.PHONY : run

code/asm/Makefile

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+SECTIONS_Arithmetic = \
+	add \
+	add2 \
+	sub \
+	addi \
+	subi \
+	neg \
+	nop \
+	mv \
+	lui \
+	li
+
+SECTIONS_Logical = \
+	and \
+	andi \
+	not
+
+SECTIONS_Shifting = \
+	slli \
+	srli \
+	srai
+
+SECTIONS_Load_Store = \
+	lb \
+	lbu \
+	sb \
+	auipc \
+	la
+
+SECTIONS_Branch = \
+	bne
+
+SECTIONS_Jump = \
+	jalr \
+
+SECTIONS_CallingConventions = \
+	cc_leaf \
+	cc_nested \
+
+SECTIONS_others = \
+	asm2c \
+	c2asm
+
+SECTIONS = \
+	_first \
+	$(SECTIONS_Arithmetic) \
+	$(SECTIONS_Logical) \
+	$(SECTIONS_Shifting) \
+	$(SECTIONS_Load_Store) \
+	$(SECTIONS_Branch) \
+	$(SECTIONS_Jump) \
+	$(SECTIONS_CallingConventions) \
+	$(SECTIONS_others)
+
+.DEFAULT_GOAL := all
+all :
+	@echo "begin compile ALL exercises for assembly samples ......................."
+	for dir in $(SECTIONS); do $(MAKE) -C $$dir || exit "$$?"; done
+	@echo "compile ALL exercises finished successfully! ......"
+
+.PHONY : clean
+clean:
+	for dir in $(SECTIONS); do $(MAKE) -C $$dir clean || exit "$$?"; done

code/asm/_first/Makefile

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+../build.mk

code/asm/_first/test.s

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+# First RISC-V Assemble Sample
+
+.macro do_nothing	# directive
+	nop		# pseudo-instruction
+	nop		# pseudo-instruction
+.endm			# directive
+
+	.text		# directive
+	.global _start	# directive
+_start: 		# Label
+	li x6, 5	# pseudo-instruction
+	li x7, 4	# pseudo-instruction
+	add x5, x6, x7	# instruction
+	do_nothing	# Calling macro
+stop:	
+	j stop		# statement in one line
+
+	.end		# End of file

code/asm/add/Makefile

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+../build.mk

code/asm/add/test.s

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+	.text
+	.global _start
+array:
+	.word 'h'
+	.word 'e'
+	.word 'l'
+	.word 'l'
+	.word 'o'
+	.word 'w'
+	.word 'o'
+	.word 'r'
+	.word 'l'
+	.word 'd'
+	.word '!'
+	.word '\0'
+
+_start:
+	li a0,0
+	la a1,array
+	li a3,'\0'
+loop:
+	addi a0,a0,1
+	lw a2,a1
+	addi a1,a1,4
+	bne a2, a3, _end # if t0 != t1 then target
+
+
+_end:
+	j _end
+
+
+	.end
+
+
+# char array[] = {'h', 'e', 'l', 'l', 'o', ',', 'w', 'o', 'r', 'l', 'd', '!', '\0'}; 
+# int len = 0; 
+# while (array[len] != '\0') { 
+#   len++; 
+# }

code/asm/add2/Makefile

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+../build.mk