[lttng-dev] [PATCH] liburcu: Support for NIOS2 architecture

[Mathieu Desnoyers]

----- On Feb 9, 2016, at 11:55 AM, Marek Vasut marex at denx.de wrote:

> Add support for the Altera NIOS2 CPU archirecture. The atomic operations
> are handled by the GCC. The memory barriers on this systems are entirely
> trivial too, since the CPU does not support SMP at all.
> 
> Signed-off-by: Marek Vasut <marex at denx.de>
> ---
> LICENSE              |  1 +
> README.md            |  1 +
> configure.ac         |  1 +
> urcu/arch/nios2.h    | 40 ++++++++++++++++++++++++++++++++++++++++
> urcu/uatomic/nios2.h | 32 ++++++++++++++++++++++++++++++++
> 5 files changed, 75 insertions(+)
> create mode 100644 urcu/arch/nios2.h
> create mode 100644 urcu/uatomic/nios2.h
> 
> diff --git a/LICENSE b/LICENSE
> index 3147094..a06fdcc 100644
> --- a/LICENSE
> +++ b/LICENSE
> @@ -45,6 +45,7 @@ compiler.h
> arch/s390.h
> uatomic/alpha.h
> uatomic/mips.h
> +uatomic/nios2.h
> uatomic/s390.h
> system.h
> 
> diff --git a/README.md b/README.md
> index f6b290f..6fe9c1e 100644
> --- a/README.md
> +++ b/README.md
> @@ -43,6 +43,7 @@ Currently, the following architectures are supported:
>   - S390, S390x
>   - ARM 32/64
>   - MIPS
> +  - NIOS2
>   - Alpha
>   - ia64
>   - Sparcv9 32/64
> diff --git a/configure.ac b/configure.ac
> index 39a7777..71a7d71 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -124,6 +124,7 @@ AS_CASE([$host_cpu],
> 	[arm*], [ARCHTYPE="arm"],
> 	[aarch64], [ARCHTYPE="aarch64"],
> 	[mips*], [ARCHTYPE="mips"],
> +	[nios2*], [ARCHTYPE="nios2"],
> 	[tile*], [ARCHTYPE="tile"],
> 	[hppa*], [ARCHTYPE="hppa"],
> 	[ARCHTYPE="unknown"]
> diff --git a/urcu/arch/nios2.h b/urcu/arch/nios2.h
> new file mode 100644
> index 0000000..030d1bc
> --- /dev/null
> +++ b/urcu/arch/nios2.h
> @@ -0,0 +1,40 @@
> +#ifndef _URCU_ARCH_NIOS2_H
> +#define _URCU_ARCH_NIOS2_H
> +
> +/*
> + * arch_mips.h: trivial definitions for the NIOS2 architecture.

mips -> nops2

> + *
> + * Copyright (c) 2016 Marek Vasut <marex at denx.de>
> + *
> + * This library is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Lesser General Public
> + * License as published by the Free Software Foundation; either
> + * version 2.1 of the License, or (at your option) any later version.
> + *
> + * This library is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * Lesser General Public License for more details.
> + *
> + * You should have received a copy of the GNU Lesser General Public
> + * License along with this library; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
> + */
> +
> +#include <urcu/compiler.h>
> +#include <urcu/config.h>
> +#include <urcu/syscall-compat.h>
> +
> +#ifdef __cplusplus
> +extern "C" {
> +#endif
> +
> +#define cmm_mb()	__asm__ __volatile__ ("":::"memory")

please change for:

#define cmm_mb()	cmm_barrier()

to re-use the cmm_barrier macro from urcu/compiler.h

The rest looks good, can you prepare an updated patch ?

Thanks!

Mathieu

> +
> +#ifdef __cplusplus
> +}
> +#endif
> +
> +#include <urcu/arch/generic.h>
> +
> +#endif /* _URCU_ARCH_NIOS2_H */
> diff --git a/urcu/uatomic/nios2.h b/urcu/uatomic/nios2.h
> new file mode 100644
> index 0000000..5b3c303
> --- /dev/null
> +++ b/urcu/uatomic/nios2.h
> @@ -0,0 +1,32 @@
> +#ifndef _URCU_UATOMIC_ARCH_NIOS2_H
> +#define _URCU_UATOMIC_ARCH_NIOS2_H
> +
> +/*
> + * Atomic exchange operations for the NIOS2 architecture. Let GCC do it.
> + *
> + * Copyright (c) 2016 Marek Vasut <marex at denx.de>
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a copy
> + * of this software and associated documentation files (the "Software"), to
> + * deal in the Software without restriction, including without limitation the
> + * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
> + * sell copies of the Software, and to permit persons to whom the Software is
> + * furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
> + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
> + * IN THE SOFTWARE.
> + */
> +
> +#include <urcu/compiler.h>
> +#include <urcu/system.h>
> +#include <urcu/uatomic/generic.h>
> +
> +#endif /* _URCU_UATOMIC_ARCH_NIOS2_H */
> --
> 2.7.0
> 
> 
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-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com