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| -rw-r--r-- | README.md | 43 |
1 files changed, 29 insertions, 14 deletions
@@ -1,29 +1,44 @@ # stmos -stmos is an operating system for STM microprocessors. It aims to support (or be able to support) all STM Cortex-M processors. - +stmos is an attempt to implement a general-purpose operating system on ARM +microcontrollers. The name "stmos" is due to the fact that this was first +implemented on an STM32L476RG MCU (ARM Cortex-M4F), and the operating system +still includes many operations/values that are specific to this processor +(currently limiting the portability of this OS). + +Eventually, this OS aims to support at least all Cortex-M MCUs. + Features: -* Unprivileged code execution -* ELF loading and execution (loads an init from the initrd) -* Near-full C standard library support for loaded ELFs -* libgpio: GPIO access for loaded ELFs +* Advanced heap that does its best to keep large chunks of memory available +* Round-robin multitasking that keeps tasks in userspace +* A virtual filesystem implementation with stdio/initrd built into the kernel +* Ability to execute ELF files loaded from the filesystem +* A nearly complete C standard library implementation available to loaded ELFs +(using [PDCLib](https://github.com/DevSolar/pdclib)) +* libgpio: The first userspace library; makes GPIO available to loaded ELFs Currently supported processors: * STM32L476RG (board: NUCLEO-L476RG) ### building To build stmos, you'll need the following programs: -* The arm-stmos toolchain (see the ```arm-stmos``` folder) +* The arm-stmos toolchain (see the `arm-stmos` folder) * openocd -* gdb (with multiarch support) +* gdb (with multiarch support, `gdb-multiarch` on Debian) -To compile stmos simply run ```make``` (-j option supported). To upload, use ```run.sh``` to start openocd/gdb; do ```lo``` to load stmos, and ```c``` to run it. +To compile stmos simply run `make` (-j supported). To upload, use `run.sh` to +launch OpenOCD and GDB; then, do `lo` to load stmos, and `c` to begin execution. ### notes -Only the initrd works right now in regards to filesystem access. Files in the folder ```src/initrd/files``` are put into the initrd. C source files in ```src/initrd``` are compiled with libgpio, placing the program in ```src/initrd/files```. +Currently, the only available filesystem driver is for the initrd. Files in the +folder `src/initrd/files` are put into the initrd. C source files in +`src/initrd` are compiled (with libgpio available), placing the programs in +`src/initrd/files` What's next for stmos? -* SD card support -* Display support (ILI....) -* Script program support (a shell like sash, maybe lua) -* More ELF work (better execve, signals?, etc.) +* Processor independence +* SD card support? +* Display support? (ILI....) +* Support for running a popular program (e.g. a shell like sash, maybe lua) +* Growth of features available to loaded ELFs (better execve, signals?, etc.) + |