Chris@102: /*
Chris@102:  * Distributed under the Boost Software License, Version 1.0.
Chris@102:  * (See accompanying file LICENSE_1_0.txt or copy at
Chris@102:  * http://www.boost.org/LICENSE_1_0.txt)
Chris@102:  *
Chris@102:  * Copyright (c) 2009 Helge Bahmann
Chris@102:  * Copyright (c) 2009 Phil Endecott
Chris@102:  * Copyright (c) 2013 Tim Blechmann
Chris@102:  * ARM Code by Phil Endecott, based on other architectures.
Chris@102:  * Copyright (c) 2014 Andrey Semashev
Chris@102:  */
Chris@102: /*!
Chris@102:  * \file   atomic/detail/caps_gcc_arm.hpp
Chris@102:  *
Chris@102:  * This header defines feature capabilities macros
Chris@102:  */
Chris@102: 
Chris@102: #ifndef BOOST_ATOMIC_DETAIL_CAPS_GCC_ARM_HPP_INCLUDED_
Chris@102: #define BOOST_ATOMIC_DETAIL_CAPS_GCC_ARM_HPP_INCLUDED_
Chris@102: 
Chris@102: #include <boost/atomic/detail/config.hpp>
Chris@102: 
Chris@102: #ifdef BOOST_HAS_PRAGMA_ONCE
Chris@102: #pragma once
Chris@102: #endif
Chris@102: 
Chris@102: #if !(defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) || defined(__ARM_ARCH_6Z__) || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6ZK__))
Chris@102: // ARMv7 and later have dmb instruction
Chris@102: #define BOOST_ATOMIC_DETAIL_ARM_HAS_DMB 1
Chris@102: #endif
Chris@102: 
Chris@102: #if !(defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) || defined(__ARM_ARCH_6Z__))
Chris@102: // ARMv6k and ARMv7 have 8 and 16 ldrex/strex variants
Chris@102: #define BOOST_ATOMIC_DETAIL_ARM_HAS_LDREXB_STREXB 1
Chris@102: #define BOOST_ATOMIC_DETAIL_ARM_HAS_LDREXH_STREXH 1
Chris@102: #if !(((defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6ZK__)) && defined(__thumb__)) || defined(__ARM_ARCH_7M__))
Chris@102: // ARMv6k and ARMv7 except ARMv7-M have 64-bit ldrex/strex variants.
Chris@102: // Unfortunately, GCC (at least 4.7.3 on Ubuntu) does not allocate register pairs properly when targeting ARMv6k Thumb,
Chris@102: // which is required for ldrexd/strexd instructions, so we disable 64-bit support. When targeting ARMv6k ARM
Chris@102: // or ARMv7 (both ARM and Thumb 2) it works as expected.
Chris@102: #define BOOST_ATOMIC_DETAIL_ARM_HAS_LDREXD_STREXD 1
Chris@102: #endif
Chris@102: #endif
Chris@102: 
Chris@102: #define BOOST_ATOMIC_INT8_LOCK_FREE 2
Chris@102: #define BOOST_ATOMIC_INT16_LOCK_FREE 2
Chris@102: #define BOOST_ATOMIC_INT32_LOCK_FREE 2
Chris@102: #if defined(BOOST_ATOMIC_DETAIL_ARM_HAS_LDREXD_STREXD)
Chris@102: #define BOOST_ATOMIC_INT64_LOCK_FREE 2
Chris@102: #endif
Chris@102: #define BOOST_ATOMIC_POINTER_LOCK_FREE 2
Chris@102: 
Chris@102: #define BOOST_ATOMIC_THREAD_FENCE 2
Chris@102: #define BOOST_ATOMIC_SIGNAL_FENCE 2
Chris@102: 
Chris@102: #endif // BOOST_ATOMIC_DETAIL_CAPS_GCC_ARM_HPP_INCLUDED_