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/* Copyright 2016 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* Atomic operations for x86 */
#ifndef __CROS_EC_ATOMIC_H
#define __CROS_EC_ATOMIC_H
#include "common.h"
#include "util.h"
typedef int atomic_t;
typedef atomic_t atomic_val_t;
static inline int bool_compare_and_swap_u32(uint32_t *var, uint32_t old_value,
uint32_t new_value)
{
uint32_t _old_value = old_value;
__asm__ __volatile__(ASM_LOCK_PREFIX "cmpxchgl %2, %1"
: "=a" (old_value), "+m" (*var)
: "r" (new_value), "0" (old_value)
: "memory");
return (_old_value == old_value);
}
static inline atomic_val_t atomic_or_u8(uint8_t *addr, uint8_t bits)
{
return __atomic_fetch_or(addr, bits, __ATOMIC_SEQ_CST);
}
static inline atomic_val_t atomic_and_u8(uint8_t *addr, uint8_t bits)
{
return __atomic_fetch_and(addr, bits, __ATOMIC_SEQ_CST);
}
static inline atomic_val_t atomic_clear_bits(atomic_t *addr, atomic_val_t bits)
{
return __atomic_fetch_and(addr, ~bits, __ATOMIC_SEQ_CST);
}
static inline atomic_val_t atomic_or(atomic_t *addr, atomic_val_t bits)
{
return __atomic_fetch_or(addr, bits, __ATOMIC_SEQ_CST);
}
static inline atomic_val_t atomic_add(atomic_t *addr, atomic_val_t value)
{
return __atomic_fetch_add(addr, value, __ATOMIC_SEQ_CST);
}
static inline atomic_val_t atomic_and(atomic_t *addr, atomic_val_t bits)
{
return __atomic_fetch_and(addr, bits, __ATOMIC_SEQ_CST);
}
static inline atomic_val_t atomic_sub(atomic_t *addr, atomic_val_t value)
{
return __atomic_fetch_sub(addr, value, __ATOMIC_SEQ_CST);
}
static inline atomic_val_t atomic_clear(atomic_t *addr)
{
return __atomic_exchange_n(addr, 0, __ATOMIC_SEQ_CST);
}
#endif /* __CROS_EC_ATOMIC_H */
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