TUWA-RTOS, kcpp and icpp

A real-time operating system, and the compiler toolchain that builds for it.

TUWA-RTOS

Real-time operating system

A small preemptive real-time operating system. A portable C kernel - scheduler, memory manager, timers and a full set of inter-task communication primitives - over a thin per-CPU layer and a board support package.

Runs on AArch64, x86-64, RISC-V 64 and i386
Preemptive scheduling, message queues, pipes, mailboxes, events, mutexes, semaphores and software timers
Loads relocatable binary modules at run time - ELF, PE and its own picfmt2 format
FAT12 filesystem on a RAM disk, with a shell to browse it

Download zip (81 KB) Download tar.gz (58 KB)

Read online: Overview Build guide Porting guide BSP guide API reference Modules

Documentation and public headers. The kernel itself is not in this archive.

KCPP & ICPP

C/C++ compiler, toolchain and interpreter

kcpp compiles C and C++ for small targets and brings the whole chain with it - assembler, linker, librarian, disassembler and the tools that turn a linked image into something a board or a simulator can load. The same binary also runs C as a script.

Register width and address width chosen independently, because real machines do that
Output as .kx, ELF, COFF or PE - the container is independent of the CPU
Position-independent code and loadable modules
icpp: run C in-process with no build step, and a library format with version checking

Download zip (25 KB) Download tar.gz (10 KB)

Read online: kcpp manual icpp manual Library format

Manuals and examples. The compiler binaries are not in this archive.