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/*-
 *   BSD LICENSE
 * 
 *   Copyright(c) 2010-2012 Intel Corporation. All rights reserved.
 *   All rights reserved.
 * 
 *   Redistribution and use in source and binary forms, with or without 
 *   modification, are permitted provided that the following conditions 
 *   are met:
 * 
 *     * Redistributions of source code must retain the above copyright 
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright 
 *       notice, this list of conditions and the following disclaimer in 
 *       the documentation and/or other materials provided with the 
 *       distribution.
 *     * Neither the name of Intel Corporation nor the names of its 
 *       contributors may be used to endorse or promote products derived 
 *       from this software without specific prior written permission.
 * 
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
 *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 */

#ifndef _RTE_ATOMIC_H_
#define _RTE_ATOMIC_H_

/**
 * @file
 * Atomic Operations
 *
 * This file defines a generic API for atomic
 * operations. The implementation is architecture-specific.
 *
 * See lib/librte_eal/common/include/i686/arch/rte_atomic.h
 * See lib/librte_eal/common/include/x86_64/arch/rte_atomic.h
 */

#ifdef __cplusplus
extern "C" {
#endif

#include <stdint.h>

#include "arch/rte_atomic.h"


#ifdef __DOXYGEN__

/**
 * General memory barrier.
 *
 * Guarantees that the LOAD and STORE operations generated before the
 * barrier occur before the LOAD and STORE operations generated after.
 */
#define rte_mb()  asm volatile("mfence;" : : : "memory")

/**
 * Write memory barrier.
 *
 * Guarantees that the STORE operations generated before the barrier
 * occur before the STORE operations generated after.
 */
#define rte_wmb() asm volatile("sfence;" : : : "memory")

/**
 * Read memory barrier.
 *
 * Guarantees that the LOAD operations generated before the barrier
 * occur before the LOAD operations generated after.
 */
#define rte_rmb() asm volatile("lfence;" : : : "memory")

/*------------------------- 16 bit atomic operations -------------------------*/

/**
 * Atomic compare and set.
 *
 * (atomic) equivalent to:
 *   if (*dst == exp)
 *     *dst = src (all 16-bit words)
 *
 * @param dst
 *   The destination location into which the value will be written.
 * @param exp
 *   The expected value.
 * @param src
 *   The new value.
 * @return
 *   Non-zero on success; 0 on failure.
 */
static inline int
rte_atomic16_cmpset(volatile uint16_t *dst, uint16_t exp, uint16_t src);

/**
 * The atomic counter structure.
 */
typedef struct {
	volatile int16_t cnt; /**< An internal counter value. */
} rte_atomic16_t;

/**
 * Static initializer for an atomic counter.
 */
#define RTE_ATOMIC16_INIT(val) { (val) }

/**
 * Initialize an atomic counter.
 *
 * @param v
 *   A pointer to the atomic counter.
 */
static inline void
rte_atomic16_init(rte_atomic16_t *v)
{
	v->cnt = 0;
}

/**
 * Atomically read a 16-bit value from a counter.
 *
 * @param v
 *   A pointer to the atomic counter.
 * @return
 *   The value of the counter.
 */
static inline int16_t
rte_atomic16_read(const rte_atomic16_t *v);

/**
 * Atomically set a counter to a 16-bit value.
 *
 * @param v
 *   A pointer to the atomic counter.
 * @param new_value
 *   The new value for the counter.
 */
static inline void
rte_atomic16_set(rte_atomic16_t *v, int16_t new_value);

/**
 * Atomically add a 16-bit value to an atomic counter.
 *
 * @param v
 *   A pointer to the atomic counter.
 * @param inc
 *   The value to be added to the counter.
 */
static inline void
rte_atomic16_add(rte_atomic16_t *v, int16_t inc);

/**
 * Atomically subtract a 16-bit value from an atomic counter.
 *
 * @param v
 *   A pointer to the atomic counter.
 * @param dec
 *   The value to be subtracted from the counter.
 */
static inline void
rte_atomic16_sub(rte_atomic16_t *v, int16_t dec);

/**
 * Atomically increment a counter by one.
 *
 * @param v
 *   A pointer to the atomic counter.
 */
static inline void
rte_atomic16_inc(rte_atomic16_t *v);

/**
 * Atomically decrement a counter by one.
 *
 * @param v
 *   A pointer to the atomic counter.
 */
static inline void
rte_atomic16_dec(rte_atomic16_t *v);

/**
 * Atomically add a 16-bit value to a counter and return the result.
 *
 * Atomically adds the 16-bits value (inc) to the atomic counter (v) and
 * returns the value of v after addition.
 *
 * @param v
 *   A pointer to the atomic counter.
 * @param inc
 *   The value to be added to the counter.
 * @return
 *   The value of v after the addition.
 */
static inline int16_t
rte_atomic16_add_return(rte_atomic16_t *v, int16_t inc);

/**
 * Atomically subtract a 16-bit value from a counter and return
 * the result.
 *
 * Atomically subtracts the 16-bit value (inc) from the atomic counter
 * (v) and returns the value of v after the subtraction.
 *
 * @param v
 *   A pointer to the atomic counter.
 * @param dec
 *   The value to be subtracted from the counter.
 * @return
 *   The value of v after the subtraction.
 */
static inline int16_t
rte_atomic16_sub_return(rte_atomic16_t *v, int16_t dec);

/**
 * Atomically increment a 16-bit counter by one and test.
 *
 * Atomically increments the atomic counter (v) by one and returns true if
 * the result is 0, or false in all other cases.
 *
 * @param v
 *   A pointer to the atomic counter.
 * @return
 *   True if the result after the increment operation is 0; false otherwise.
 */
static inline int
rte_atomic16_inc_and_test(rte_atomic16_t *v);

/**
 * Atomically decrement a 16-bit counter by one and test.
 *
 * Atomically decrements the atomic counter (v) by one and returns true if
 * the result is 0, or false in all other cases.
 *
 * @param v
 *   A pointer to the atomic counter.
 * @return
 *   True if the result after the decrement operation is 0; false otherwise.
 */
static inline int
rte_atomic16_dec_and_test(rte_atomic16_t *v);

/**
 * Atomically test and set a 16-bit atomic counter.
 *
 * If the counter value is already set, return 0 (failed). Otherwise, set
 * the counter value to 1 and return 1 (success).
 *
 * @param v
 *   A pointer to the atomic counter.
 * @return
 *   0 if failed; else 1, success.
 */
static inline int
rte_atomic16_test_and_set(rte_atomic16_t *v);

/**
 * Atomically set a 16-bit counter to 0.
 *
 * @param v
 *   A pointer to the atomic counter.
 */
static inline void
rte_atomic16_clear(rte_atomic16_t *v);

/*------------------------- 32 bit atomic operations -------------------------*/

/**
 * Atomic compare and set.
 *
 * (atomic) equivalent to:
 *   if (*dst == exp)
 *     *dst = src (all 32-bit words)
 *
 * @param dst
 *   The destination location into which the value will be written.
 * @param exp
 *   The expected value.
 * @param src
 *   The new value.
 * @return
 *   Non-zero on success; 0 on failure.
 */
static inline int
rte_atomic32_cmpset(volatile uint32_t *dst, uint32_t exp, uint32_t src);

/**
 * The atomic counter structure.
 */
typedef struct {
	volatile int32_t cnt; /**< An internal counter value. */
} rte_atomic32_t;

/**
 * Static initializer for an atomic counter.
 */
#define RTE_ATOMIC32_INIT(val) { (val) }

/**
 * Initialize an atomic counter.
 *
 * @param v
 *   A pointer to the atomic counter.
 */
static inline void
rte_atomic32_init(rte_atomic32_t *v);

/**
 * Atomically read a 32-bit value from a counter.
 *
 * @param v
 *   A pointer to the atomic counter.
 * @return
 *   The value of the counter.
 */
static inline int32_t
rte_atomic32_read(const rte_atomic32_t *v);

/**
 * Atomically set a counter to a 32-bit value.
 *
 * @param v
 *   A pointer to the atomic counter.
 * @param new_value
 *   The new value for the counter.
 */
static inline void
rte_atomic32_set(rte_atomic32_t *v, int32_t new_value);

/**
 * Atomically add a 32-bit value to an atomic counter.
 *
 * @param v
 *   A pointer to the atomic counter.
 * @param inc
 *   The value to be added to the counter.
 */
static inline void
rte_atomic32_add(rte_atomic32_t *v, int32_t inc);

/**
 * Atomically subtract a 32-bit value from an atomic counter.
 *
 * @param v
 *   A pointer to the atomic counter.
 * @param dec
 *   The value to be subtracted from the counter.
 */
static inline void
rte_atomic32_sub(rte_atomic32_t *v, int32_t dec);

/**
 * Atomically increment a counter by one.
 *
 * @param v
 *   A pointer to the atomic counter.
 */
static inline void
rte_atomic32_inc(rte_atomic32_t *v);

/**
 * Atomically decrement a counter by one.
 *
 * @param v
 *   A pointer to the atomic counter.
 */
static inline void
rte_atomic32_dec(rte_atomic32_t *v);

/**
 * Atomically add a 32-bit value to a counter and return the result.
 *
 * Atomically adds the 32-bits value (inc) to the atomic counter (v) and
 * returns the value of v after addition.
 *
 * @param v
 *   A pointer to the atomic counter.
 * @param inc
 *   The value to be added to the counter.
 * @return
 *   The value of v after the addition.
 */
static inline int32_t
rte_atomic32_add_return(rte_atomic32_t *v, int32_t inc);

/**
 * Atomically subtract a 32-bit value from a counter and return
 * the result.
 *
 * Atomically subtracts the 32-bit value (inc) from the atomic counter
 * (v) and returns the value of v after the subtraction.
 *
 * @param v
 *   A pointer to the atomic counter.
 * @param dec
 *   The value to be subtracted from the counter.
 * @return
 *   The value of v after the subtraction.
 */
static inline int32_t
rte_atomic32_sub_return(rte_atomic32_t *v, int32_t dec);

/**
 * Atomically increment a 32-bit counter by one and test.
 *
 * Atomically increments the atomic counter (v) by one and returns true if
 * the result is 0, or false in all other cases.
 *
 * @param v
 *   A pointer to the atomic counter.
 * @return
 *   True if the result after the increment operation is 0; false otherwise.
 */
static inline int
rte_atomic32_inc_and_test(rte_atomic32_t *v);

/**
 * Atomically decrement a 32-bit counter by one and test.
 *
 * Atomically decrements the atomic counter (v) by one and returns true if
 * the result is 0, or false in all other cases.
 *
 * @param v
 *   A pointer to the atomic counter.
 * @return
 *   True if the result after the decrement operation is 0; false otherwise.
 */
static inline int
rte_atomic32_dec_and_test(rte_atomic32_t *v);

/**
 * Atomically test and set a 32-bit atomic counter.
 *
 * If the counter value is already set, return 0 (failed). Otherwise, set
 * the counter value to 1 and return 1 (success).
 *
 * @param v
 *   A pointer to the atomic counter.
 * @return
 *   0 if failed; else 1, success.
 */
static inline int
rte_atomic32_test_and_set(rte_atomic32_t *v);

/**
 * Atomically set a 32-bit counter to 0.
 *
 * @param v
 *   A pointer to the atomic counter.
 */
static inline void
rte_atomic32_clear(rte_atomic32_t *v);

/*------------------------- 64 bit atomic operations -------------------------*/

/**
 * An atomic compare and set function used by the mutex functions.
 * (atomic) equivalent to:
 *   if (*dst == exp)
 *     *dst = src (all 64-bit words)
 *
 * @param dst
 *   The destination into which the value will be written.
 * @param exp
 *   The expected value.
 * @param src
 *   The new value.
 * @return
 *   Non-zero on success; 0 on failure.
 */
static inline int
rte_atomic64_cmpset(volatile uint64_t *dst, uint64_t exp, uint64_t src);

/**
 * The atomic counter structure.
 */
typedef struct {
	volatile int64_t cnt;  /**< Internal counter value. */
} rte_atomic64_t;

/**
 * Static initializer for an atomic counter.
 */
#define RTE_ATOMIC64_INIT(val) { (val) }

/**
 * Initialize the atomic counter.
 *
 * @param v
 *   A pointer to the atomic counter.
 */
static inline void
rte_atomic64_init(rte_atomic64_t *v);

/**
 * Atomically read a 64-bit counter.
 *
 * @param v
 *   A pointer to the atomic counter.
 * @return
 *   The value of the counter.
 */
static inline int64_t
rte_atomic64_read(rte_atomic64_t *v);

/**
 * Atomically set a 64-bit counter.
 *
 * @param v
 *   A pointer to the atomic counter.
 * @param new_value
 *   The new value of the counter.
 */
static inline void
rte_atomic64_set(rte_atomic64_t *v, int64_t new_value);

/**
 * Atomically add a 64-bit value to a counter.
 *
 * @param v
 *   A pointer to the atomic counter.
 * @param inc
 *   The value to be added to the counter.
 */
static inline void
rte_atomic64_add(rte_atomic64_t *v, int64_t inc);

/**
 * Atomically subtract a 64-bit value from a counter.
 *
 * @param v
 *   A pointer to the atomic counter.
 * @param dec
 *   The value to be subtracted from the counter.
 */
static inline void
rte_atomic64_sub(rte_atomic64_t *v, int64_t dec);

/**
 * Atomically increment a 64-bit counter by one and test.
 *
 * @param v
 *   A pointer to the atomic counter.
 */
static inline void
rte_atomic64_inc(rte_atomic64_t *v);

/**
 * Atomically decrement a 64-bit counter by one and test.
 *
 * @param v
 *   A pointer to the atomic counter.
 */
static inline void
rte_atomic64_dec(rte_atomic64_t *v);

/**
 * Add a 64-bit value to an atomic counter and return the result.
 *
 * Atomically adds the 64-bit value (inc) to the atomic counter (v) and
 * returns the value of v after the addition.
 *
 * @param v
 *   A pointer to the atomic counter.
 * @param inc
 *   The value to be added to the counter.
 * @return
 *   The value of v after the addition.
 */
static inline int64_t
rte_atomic64_add_return(rte_atomic64_t *v, int64_t inc);

/**
 * Subtract a 64-bit value from an atomic counter and return the result.
 *
 * Atomically subtracts the 64-bit value (dec) from the atomic counter (v)
 * and returns the value of v after the subtraction.
 *
 * @param v
 *   A pointer to the atomic counter.
 * @param dec
 *   The value to be subtracted from the counter.
 * @return
 *   The value of v after the subtraction.
 */
static inline int64_t
rte_atomic64_sub_return(rte_atomic64_t *v, int64_t dec);

/**
 * Atomically increment a 64-bit counter by one and test.
 *
 * Atomically increments the atomic counter (v) by one and returns
 * true if the result is 0, or false in all other cases.
 *
 * @param v
 *   A pointer to the atomic counter.
 * @return
 *   True if the result after the addition is 0; false otherwise.
 */
static inline int
rte_atomic64_inc_and_test(rte_atomic64_t *v);

/**
 * Atomically decrement a 64-bit counter by one and test.
 *
 * Atomically decrements the atomic counter (v) by one and returns true if
 * the result is 0, or false in all other cases.
 *
 * @param v
 *   A pointer to the atomic counter.
 * @return
 *   True if the result after subtraction is 0; false otherwise.
 */
static inline int
rte_atomic64_dec_and_test(rte_atomic64_t *v);

/**
 * Atomically test and set a 64-bit atomic counter.
 *
 * If the counter value is already set, return 0 (failed). Otherwise, set
 * the counter value to 1 and return 1 (success).
 *
 * @param v
 *   A pointer to the atomic counter.
 * @return
 *   0 if failed; else 1, success.
 */
static inline int
rte_atomic64_test_and_set(rte_atomic64_t *v);

/**
 * Atomically set a 64-bit counter to 0.
 *
 * @param v
 *   A pointer to the atomic counter.
 */
static inline void
rte_atomic64_clear(rte_atomic64_t *v);

#endif /* __DOXYGEN__ */


#ifdef __cplusplus
}
#endif

#endif /* _RTE_ATOMIC_H_ */