cortexm_common: Remove atomic_arch

cpu/cortexm_common/atomic_arch.c

@@ -1,48 +0,0 @@
-/*
- * Copyright (C) 2014-2015 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
- */
-
-/**
- * @ingroup     cpu_cortexm_common
- * @{
- *
- * @file
- * @brief       Implementation of the kernels atomic interface
- *
- * @author      Stefan Pfeiffer <stefan.pfeiffer@fu-berlin.de>
- * @author      Hauke Petersen <hauke.petersen@fu-berlin.de>
- * @author      Joakim Nohlgård <joakim.nohlgard@eistec.se>
- *
- * @}
- */
-
-#include <stdint.h>
-#include "atomic.h"
-#include "irq.h"
-#include "cpu.h"
-
-#if ARCH_HAS_ATOMIC_COMPARE_AND_SWAP
-int atomic_cas(atomic_int_t *var, int old, int now)
-{
-    int tmp;
-    int status;
-
-    /* Load exclusive */
-    tmp = __LDREXW((volatile uint32_t *)(&ATOMIC_VALUE(*var)));
-
-    if (tmp != old) {
-        /* Clear memory exclusivity */
-        __CLREX();
-        return 0;
-    }
-
-    /* Try to write the new value */
-    status = __STREXW(now, (volatile uint32_t *)(&ATOMIC_VALUE(*var)));
-
-    return (status == 0);
-}
-#endif

cpu/cortexm_common/include/cpu.h

@@ -41,15 +41,6 @@
 extern "C" {
 #endif
 
-/**
- * @brief   Some members of the Cortex-M family have architecture specific
- *          atomic operations in atomic_arch.c
- */
-#if defined(CPU_ARCH_CORTEX_M3) || defined(CPU_ARCH_CORTEX_M4) || \
-    defined(CPU_ARCH_CORTEX_M4F)
-#define ARCH_HAS_ATOMIC_COMPARE_AND_SWAP 1
-#endif
-
 /**
  * @brief Interrupt stack canary value
  *