/* 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 */