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Build a minimal multi-tasking OS kernel for ARM from scratch

Prerequisites

./configure --disable-werror --enable-debug \
    --target-list="arm-softmmu" \
    --extra-cflags=-DSTM32_UART_NO_BAUD_DELAY \
    --extra-cflags=-DSTM32_UART_ENABLE_OVERRUN \
    --disable-gtk
make

Steps

  • 00-Semihosting
    • Minimal semihosted ARM Cortex-M "Hello World"
  • 00-HelloWorld
    • Enable STM32 USART to print trivial greetings
  • 01-HelloWorld
    • Almost identical to the previous one but improved startup routines
  • 02-ContextSwitch-1
    • Basic switch between user and kernel mode
  • 03-ContextSwitch-2
    • system call is introduced as an effective method to return to kernel
  • 04-Multitasking
    • Two user tasks are interatively switching
  • 05-TimerInterrupt
    • Enable SysTick for future scheduler implementation
  • 06-Preemptive
    • Basic preemptive scheduling
  • 07-Threads
    • Implement user-level threads

Building and Verification

  • Changes the current working directory to the specified one and then
make
make qemu

Licensing

mini-arm-os is freely redistributable under the two-clause BSD License. Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.

Reference