The latest revision (v1.1-0) of the OpenRISC 1000 architecture specification [1], adds definitions for load-linked/store-conditional type of atomic instructions.
There are already a couple of implementations available that has support for these instructions implemented. E.g. a hardware implementation - mor1kx and a functional simulator - or1ksim. This series of patches takes these new instructions into use to create hardware assisted versions of atomic/bitops/cmpxchg. It also enables proper support for futexes, something that hasn't been available previously. [1] https://github.com/openrisc/doc/blob/master/openrisc-arch-1.1-rev0.pdf?raw=true Stefan Kristiansson (6): openrisc: add Kconfig for l.lwa and l.swa atomic instructions openrisc: add atomic bitops openrisc: add cmpxchg and xchg implementations openrisc: add atomic operations implementations openrisc: include l.swa in check for write data pagefault openrisc: add futex_atomic_* implementations arch/openrisc/Kconfig | 7 ++ arch/openrisc/include/asm/Kbuild | 4 - arch/openrisc/include/asm/atomic.h | 88 +++++++++++++++++++ arch/openrisc/include/asm/bitops.h | 2 +- arch/openrisc/include/asm/bitops/atomic.h | 109 +++++++++++++++++++++++ arch/openrisc/include/asm/cmpxchg.h | 83 ++++++++++++++++++ arch/openrisc/include/asm/futex.h | 140 ++++++++++++++++++++++++++++++ arch/openrisc/kernel/entry.S | 2 +- 8 files changed, 429 insertions(+), 6 deletions(-) create mode 100644 arch/openrisc/include/asm/atomic.h create mode 100644 arch/openrisc/include/asm/bitops/atomic.h create mode 100644 arch/openrisc/include/asm/cmpxchg.h create mode 100644 arch/openrisc/include/asm/futex.h -- 1.8.3.2 _______________________________________________ Linux mailing list Linux@lists.openrisc.net http://lists.openrisc.net/listinfo/linux
