diff options
Diffstat (limited to 'include/asm-arm/atomic.h')
| -rw-r--r-- | include/asm-arm/atomic.h | 212 |
1 files changed, 0 insertions, 212 deletions
diff --git a/include/asm-arm/atomic.h b/include/asm-arm/atomic.h deleted file mode 100644 index 3b59f94..0000000 --- a/include/asm-arm/atomic.h +++ /dev/null @@ -1,212 +0,0 @@ -/* - * linux/include/asm-arm/atomic.h - * - * Copyright (C) 1996 Russell King. - * Copyright (C) 2002 Deep Blue Solutions Ltd. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ -#ifndef __ASM_ARM_ATOMIC_H -#define __ASM_ARM_ATOMIC_H - -#include <linux/compiler.h> -#include <asm/system.h> - -typedef struct { volatile int counter; } atomic_t; - -#define ATOMIC_INIT(i) { (i) } - -#ifdef __KERNEL__ - -#define atomic_read(v) ((v)->counter) - -#if __LINUX_ARM_ARCH__ >= 6 - -/* - * ARMv6 UP and SMP safe atomic ops. We use load exclusive and - * store exclusive to ensure that these are atomic. We may loop - * to ensure that the update happens. Writing to 'v->counter' - * without using the following operations WILL break the atomic - * nature of these ops. - */ -static inline void atomic_set(atomic_t *v, int i) -{ - unsigned long tmp; - - __asm__ __volatile__("@ atomic_set\n" -"1: ldrex %0, [%1]\n" -" strex %0, %2, [%1]\n" -" teq %0, #0\n" -" bne 1b" - : "=&r" (tmp) - : "r" (&v->counter), "r" (i) - : "cc"); -} - -static inline int atomic_add_return(int i, atomic_t *v) -{ - unsigned long tmp; - int result; - - __asm__ __volatile__("@ atomic_add_return\n" -"1: ldrex %0, [%2]\n" -" add %0, %0, %3\n" -" strex %1, %0, [%2]\n" -" teq %1, #0\n" -" bne 1b" - : "=&r" (result), "=&r" (tmp) - : "r" (&v->counter), "Ir" (i) - : "cc"); - - return result; -} - -static inline int atomic_sub_return(int i, atomic_t *v) -{ - unsigned long tmp; - int result; - - __asm__ __volatile__("@ atomic_sub_return\n" -"1: ldrex %0, [%2]\n" -" sub %0, %0, %3\n" -" strex %1, %0, [%2]\n" -" teq %1, #0\n" -" bne 1b" - : "=&r" (result), "=&r" (tmp) - : "r" (&v->counter), "Ir" (i) - : "cc"); - - return result; -} - -static inline int atomic_cmpxchg(atomic_t *ptr, int old, int new) -{ - unsigned long oldval, res; - - do { - __asm__ __volatile__("@ atomic_cmpxchg\n" - "ldrex %1, [%2]\n" - "mov %0, #0\n" - "teq %1, %3\n" - "strexeq %0, %4, [%2]\n" - : "=&r" (res), "=&r" (oldval) - : "r" (&ptr->counter), "Ir" (old), "r" (new) - : "cc"); - } while (res); - - return oldval; -} - -static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr) -{ - unsigned long tmp, tmp2; - - __asm__ __volatile__("@ atomic_clear_mask\n" -"1: ldrex %0, [%2]\n" -" bic %0, %0, %3\n" -" strex %1, %0, [%2]\n" -" teq %1, #0\n" -" bne 1b" - : "=&r" (tmp), "=&r" (tmp2) - : "r" (addr), "Ir" (mask) - : "cc"); -} - -#else /* ARM_ARCH_6 */ - -#include <asm/system.h> - -#ifdef CONFIG_SMP -#error SMP not supported on pre-ARMv6 CPUs -#endif - -#define atomic_set(v,i) (((v)->counter) = (i)) - -static inline int atomic_add_return(int i, atomic_t *v) -{ - unsigned long flags; - int val; - - raw_local_irq_save(flags); - val = v->counter; - v->counter = val += i; - raw_local_irq_restore(flags); - - return val; -} - -static inline int atomic_sub_return(int i, atomic_t *v) -{ - unsigned long flags; - int val; - - raw_local_irq_save(flags); - val = v->counter; - v->counter = val -= i; - raw_local_irq_restore(flags); - - return val; -} - -static inline int atomic_cmpxchg(atomic_t *v, int old, int new) -{ - int ret; - unsigned long flags; - - raw_local_irq_save(flags); - ret = v->counter; - if (likely(ret == old)) - v->counter = new; - raw_local_irq_restore(flags); - - return ret; -} - -static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr) -{ - unsigned long flags; - - raw_local_irq_save(flags); - *addr &= ~mask; - raw_local_irq_restore(flags); -} - -#endif /* __LINUX_ARM_ARCH__ */ - -#define atomic_xchg(v, new) (xchg(&((v)->counter), new)) - -static inline int atomic_add_unless(atomic_t *v, int a, int u) -{ - int c, old; - - c = atomic_read(v); - while (c != u && (old = atomic_cmpxchg((v), c, c + a)) != c) - c = old; - return c != u; -} -#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) - -#define atomic_add(i, v) (void) atomic_add_return(i, v) -#define atomic_inc(v) (void) atomic_add_return(1, v) -#define atomic_sub(i, v) (void) atomic_sub_return(i, v) -#define atomic_dec(v) (void) atomic_sub_return(1, v) - -#define atomic_inc_and_test(v) (atomic_add_return(1, v) == 0) -#define atomic_dec_and_test(v) (atomic_sub_return(1, v) == 0) -#define atomic_inc_return(v) (atomic_add_return(1, v)) -#define atomic_dec_return(v) (atomic_sub_return(1, v)) -#define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0) - -#define atomic_add_negative(i,v) (atomic_add_return(i, v) < 0) - -/* Atomic operations are already serializing on ARM */ -#define smp_mb__before_atomic_dec() barrier() -#define smp_mb__after_atomic_dec() barrier() -#define smp_mb__before_atomic_inc() barrier() -#define smp_mb__after_atomic_inc() barrier() - -#include <asm-generic/atomic.h> -#endif -#endif |
