5f355e7210
Previously the compiler was allowed to reorder access to the interrupt control registers in regard to memory access not marked as `volatile` (at least some people - most notably some compiler developers - read the C standard this way). In practise this did not happen as irq_disable(), irq_restore(), irq_enable() are part of a separate compilation unit: Calls to external functions unknown to the compiler are treated as if they were memory barriers. But if link time optimization (LTO) is enabled, this no longer would work: The compiler could inline the code accessing the interrupt control registers and reorder the memory accesses wrapped in irq_disable() and irq_restore() outside of their protection. This commit adds the "memory" clobber to the inline assembly accessing the interrupt control registers. This makes those accesses explicit compiler memory barriers. The machine code generated without LTO enabled should not differ in any way by this commit. But the use of irq_*() should now be safe with LTO.
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The friendly Operating System for IoT!
RIOT is a real-time multi-threading operating system that supports a range of devices that are typically found in the Internet of Things (IoT): 8-bit, 16-bit and 32-bit microcontrollers.
RIOT is based on the following design principles: energy-efficiency, real-time capabilities, small memory footprint, modularity, and uniform API access, independent of the underlying hardware (this API offers partial POSIX compliance).
RIOT is developed by an international open source community which is independent of specific vendors (e.g. similarly to the Linux community). RIOT is licensed with LGPLv2.1, a copyleft license which fosters indirect business models around the free open-source software platform provided by RIOT, e.g. it is possible to link closed-source code with the LGPL code.
FEATURES
RIOT is based on a microkernel architecture, and provides features including, but not limited to:
- a preemptive, tickless scheduler with priorities
- flexible memory management
- high resolution, long-term timers
- support 100+ boards based on AVR, MSP430, ESP8266, ESP32, MIPS, RISC-V, ARM7 and ARM Cortex-M
- the native port allows to run RIOT as-is on Linux, BSD, and MacOS. Multiple instances of RIOT running on a single machine can also be interconnected via a simple virtual Ethernet bridge
- IPv6
- 6LoWPAN (RFC4944, RFC6282, and RFC6775)
- UDP
- RPL (storing mode, P2P mode)
- CoAP
- CCN-Lite
- Sigfox
- LoRaWAN
GETTING STARTED
- You want to start the RIOT? Just follow our quickstart guide or try this tutorial. For specific toolchain installation, follow instructions in the getting started page.
- The RIOT API itself can be built from the code using doxygen. The latest version of the documentation is uploaded daily to riot-os.org/api.
USING THE NATIVE PORT WITH NETWORKING
If you compile RIOT for the native cpu and include the netdev_tap module,
you can specify a network interface like this: PORT=tap0 make term
SETTING UP A TAP NETWORK
There is a shell script in RIOT/dist/tools/tapsetup called tapsetup which
you can use to create a network of tap interfaces.
USAGE
To create a bridge and two (or count at your option) tap interfaces:
./dist/tools/tapsetup/tapsetup [-c [<count>]]
CONTRIBUTE
To contribute something to RIOT, please refer to our contributing document.
MAILING LISTS
- RIOT OS kernel developers list
- devel@riot-os.org (https://lists.riot-os.org/mailman/listinfo/devel)
- RIOT OS users list
- users@riot-os.org (https://lists.riot-os.org/mailman/listinfo/users)
- RIOT commits
- commits@riot-os.org (https://lists.riot-os.org/mailman/listinfo/commits)
- Github notifications
- notifications@riot-os.org (https://lists.riot-os.org/mailman/listinfo/notifications)
LICENSE
- Most of the code developed by the RIOT community is licensed under the GNU Lesser General Public License (LGPL) version 2.1 as published by the Free Software Foundation.
- Some external sources, especially files developed by SICS are published under a separate license.
All code files contain licensing information.
For more information, see the RIOT website: