feat: add initial process, thread and scheduler

.clang-format

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+---
+BasedOnStyle: Google
+AlignAfterOpenBracket: Align
+AlignConsecutiveMacros: true
+AlignTrailingComments: true
+AllowShortBlocksOnASingleLine: true
+AllowShortFunctionsOnASingleLine: Empty
+AllowShortIfStatementsOnASingleLine: WithoutElse
+AlwaysBreakBeforeMultilineStrings: false
+BinPackArguments: false
+BinPackParameters: false
+BreakBeforeBraces: Attach
+BreakBeforeTernaryOperators: true
+BreakStringLiterals: true
+ColumnLimit: 100
+DerivePointerAlignment: false
+IncludeBlocks: Regroup
+IndentCaseLabels: true
+IndentPPDirectives: BeforeHash
+IndentWidth: 4
+IndentWrappedFunctionNames: true
+Language: Cpp
+MaxEmptyLinesToKeep: 2
+PointerAlignment: Middle
+ReflowComments: true
+SortIncludes: true
+SpaceAfterCStyleCast: false
+SpaceAfterLogicalNot: false
+SpaceAfterTemplateKeyword: false
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeParens: ControlStatements
+SpaceInEmptyParentheses: false
+SpacesInAngles: false
+SpacesInCStyleCastParentheses: false
+SpacesInContainerLiterals: false
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+TabWidth: 4
+UseTab: Never
+
+...

.editorconfig

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+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+indent_size = 4
+charset = utf-8
+
+[*.yml]
+indent_size = 2

.gitattributes

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+# Sources
+*.c     text diff=c
+*.h     text diff=c
+*.h     linguist-language=C

.github/workflows/os_test.yml

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+name: course_os test suite
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Cache Toolchain
+        id: cache-toolchain
+        uses: actions/cache@v1
+        with:
+            path: toolchain
+            key: toolchain
+
+      - name: Cache Qemu
+        id: cache-qemu
+        uses: actions/cache@v1
+        with:
+            path: qemu/qemu
+            key: qemu
+
+      - name: Install Dependencies
+        run: |
+          sudo apt-get update &&
+          sudo apt-get install build-essential python3 wget texinfo zlib1g-dev -y
+
+      - name: Build Toolchain
+        if: steps.cache-toolchain.outputs.cache-hit != 'true'
+        run: rm -rf toolchain/arm-none-eabi/ && make toolchain
+
+      - name: Build Qemu
+        if: steps.cache-qemu.outputs.cache-hit != 'true'
+        run: rm -rf qemu/qemu* && make qemu
+
+      - name: Compile
+        run: make build
+
+      - name: Test
+        run: make test

.gitignore

@@ -1,32 +1,65 @@
-#these were not originally apart of the repo -- appeared after build
-/kernel/kernel.bin
-/kernel/flash.bin
-/kernel/boot-commands
-/kernel/card.sd
-/toolchain/target/
-/u-boot/u-boot-*
+# Build files
+kernel/kernel.bin
+kernel/flash.bin
+kernel/boot-commands
+kernel/card.sd
+kernel/src/test/test.c
+
+# Toolchain dir, but not the build script
+/toolchain/
+!/toolchain/build.sh
+
+# Qemu dir, again without its buildscript
 /qemu/
 !/qemu/build.sh
 
+# Generic build dirs
+build/
+/cmake-build-*/
+
+# Generated docs
+/docs/
+/html/
+/latex/
+/course_os_docs.pdf
+
+# Editor specific
 .settings/
 .cproject
 .project
+/.idea/
+!/.idea/runConfigurations
+/.vscode/
+!/.idea/settings.json
+*~
+*.swp
+[._]*.s[a-w][a-z]
+[._]s[a-w][a-z]
+*.un~
+Session.vim
+.netrwhist
+
+# CCLS files
+.ccls-cache/
+compile_commands.json
 
-#always exclude these from being pushed
+# Binary files
 *.o
 *.img
 *.map
 *.elf
 *.bin
-*~
-*.swp
 /user/hello/hello
+/user/hello/hello1
+/user/hello/hello2
 /user/libc/libc.a
 
-[._]*.s[a-w][a-z]
-[._]s[a-w][a-z]
-*.un~
-Session.vim
-.netrwhist
+# Floobits (CLion collabrative editing plugin)
+.floo
+.flooignore
 
+# Misc
 NOTES
+/server.PID
+compile_commands.json
+user/swi/swi

.vscode/launch.json

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+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "gdb",
+            "request": "attach",
+            "gdbpath": "${workspaceFolder}/toolchain/arm-none-eabi/bin/arm-none-eabi-gdb",
+            "name": "Debug",
+            "executable": "${workspaceFolder}/kernel/build/kernel.sym",
+            "target": ":1234",
+            "remote": true,
+            "cwd": "${workspaceRoot}",
+            // "preLaunchTask": "run_debug",
+            "valuesFormatting": "prettyPrinters"
+        }
+    ]
+}

.vscode/settings.json

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+{
+    "files.associations": {
+        "*.h": "c"
+    }
+}

.vscode/tasks.json

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+{
+    // See https://go.microsoft.com/fwlink/?LinkId=733558
+    // for the documentation about the tasks.json format
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "make test",
+            "detail": "Runs the course_os test suite",
+            "type": "shell",
+            "command": "make test",
+            "problemMatcher": "$gcc",
+            "group": {
+                "kind": "test",
+                "isDefault": true
+            }
+        },
+        {
+            "label": "run_debug",
+            "detail": "Runs qemu with gdbserver",
+            "type": "shell",
+            "command": "make -C kernel debug",
+        }
+    ]
+}

CMakeLists.txt

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+########################################################################
+## WARNING: This cmake file does *NOT* work to compile the course OS  ##
+## It is merely here to make clion detect all the source files        ##
+## so it can do code inspection. Use the supplied makefile to compile ##
+########################################################################
+
+cmake_minimum_required(VERSION 3.6)
+
+project(course_os)
+
+set(CMAKE_SYSTEM_NAME linux)
+set(CMAKE_SYSTEM_PROCESSOR arm)
+set(CMAKE_C_COMPILER ${CMAKE_CURRENT_SOURCE_DIR}/toolchain/arm-none-eabi/bin/arm-none-eabi-gcc)
+set(CMAKE_C_LINK_EXECUTABLE ${CMAKE_CURRENT_SOURCE_DIR}/toolchain/arm-none-eabi/bin/arm-none-eabi-ld)
+
+file(GLOB_RECURSE kernel_sources ./kernel/src/*.c ./kernel/src/**/*.c)
+file(GLOB_RECURSE kernel_include LIST_DIRECTORIES true ./kernel/src/**/include)
+
+set(SOURCE_FILES ${kernel_sources})
+
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra")
+
+add_compile_definitions(ENABLE_TESTS MEM_DEBUG)
+
+add_executable(course_os ${SOURCE_FILES})
+
+message(${kernel_include})
+
+include_directories(
+    ${kernel_include}
+)
+